解决吉大正源(身份认证网关|USBKey)和gmssl(server|client)使用gmtl协议交叉互通报错tlsv1 alert decrypt error

报错内容

• SSL_connect:error in SSLv3/TLS write finished
• 140057291788288:error:1409441B:SSL routines:ssl3_read_bytes:tlsv1 alert decrypt error:ssl/record/rec_layer_s3.c:1385:SSL alert number 51

报错原因

• gmssl库生成 certificate verify 消息时，对自客户端Hello消息开始到本消息为止（不包括 certificate verify 消息）的所有握手相关信息内容，使用SM3计算摘要，再使用私钥对该摘要签名，但是签名时没有使用SM2_DEFAULT_ID(1234567812345678)在内部做HASH。
  • gmssl实现gmtls协议的步骤中缺少使用SM3计算摘要信息，再使用私钥对摘要进行签名
• 前面你们客户端能连上gmssl服务端，应该是解决了第一个问题。虽然第二个问题没解决，也能连成功，是因为gmssl客户端和服务端计算过程是一样，才没报错，但是这样的计算过程不符合规范的，跟其他对接就会出问题了。
  • gmssl无法和其余实现上述功能的平台进行对接

相关内容

• 版本：GmSSL 2.5.4 - OpenSSL 1.1.0d  19 Jun 2019 
• 工作路径：/home/chy-cpabe/tmp/first   /home/chy-cpabe/tmp/second
  • 每个路径下包含 签名私钥 签名证书 加密私钥 加密证书 根证书 五个文件
  • 根秘钥和身份认证网关保持一致
  • first 、second、身份认证网关三个地方的证书文件均有同一个PKI进行签发

 修改文件

• 目前仅仅修改了 statem_clnt 和 statem_srvr 两个文件，后期手写自己的客户端和服务端代码进行函数调用的时候，还需要修改底层函数的实现细节

statem_clnt

/* ====================================================================
 * Copyright (c) 2014 - 2017 The GmSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the GmSSL Project.
 *    (http://gmssl.org/)"
 *
 * 4. The name "GmSSL Project" must not be used to endorse or promote
 *    products derived from this software without prior written
 *    permission. For written permission, please contact
 *    guanzhi1980@gmail.com.
 *
 * 5. Products derived from this software may not be called "GmSSL"
 *    nor may "GmSSL" appear in their names without prior written
 *    permission of the GmSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the GmSSL Project
 *    (http://gmssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE GmSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 */
/*
 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */
 
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 *
 * Portions of the attached software ("Contribution") are developed by
 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 *
 * The Contribution is licensed pursuant to the OpenSSL open source
 * license provided above.
 *
 * ECC cipher suite support in OpenSSL originally written by
 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 *
 */
/* ====================================================================
 * Copyright 2005 Nokia. All rights reserved.
 *
 * The portions of the attached software ("Contribution") is developed by
 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 * license.
 *
 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 * support (see RFC 4279) to OpenSSL.
 *
 * No patent licenses or other rights except those expressly stated in
 * the OpenSSL open source license shall be deemed granted or received
 * expressly, by implication, estoppel, or otherwise.
 *
 * No assurances are provided by Nokia that the Contribution does not
 * infringe the patent or other intellectual property rights of any third
 * party or that the license provides you with all the necessary rights
 * to make use of the Contribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 * OTHERWISE.
 */
 
#include <stdio.h>
#include "../ssl_locl.h"
#include "statem_locl.h"
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#ifndef OPENSSL_NO_MD5
# include <openssl/md5.h>
#endif
#ifndef OPENSSL_NO_DH
# include <openssl/dh.h>
#endif
#ifndef OPENSSL_NO_SM2
# include <openssl/sm2.h>
#endif
#include <openssl/bn.h>
#ifndef OPENSSL_NO_ENGINE
# include <openssl/engine.h>
#endif
 
static ossl_inline int cert_req_allowed(SSL *s);
static int key_exchange_expected(SSL *s);
static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b);
static int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk,
                                    unsigned char *p);
 
/*
 * Is a CertificateRequest message allowed at the moment or not?
 *
 *  Return values are:
 *  1: Yes
 *  0: No
 */
static ossl_inline int cert_req_allowed(SSL *s)
{
    /* TLS does not like anon-DH with client cert */
    if ((s->version > SSL3_VERSION
         && (s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL))
        || (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aSRP | SSL_aPSK)))
        return 0;
 
    return 1;
}
 
/*
 * Should we expect the ServerKeyExchange message or not?
 *
 *  Return values are:
 *  1: Yes
 *  0: No
 */
static int key_exchange_expected(SSL *s)
{
    long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 
#ifndef OPENSSL_NO_GMTLS
    if (SSL_IS_GMTLS(s))
        return 1;
#endif
    /*
     * Can't skip server key exchange if this is an ephemeral
     * ciphersuite or for SRP
     */
    if (alg_k & (SSL_kDHE | SSL_kECDHE | SSL_kDHEPSK | SSL_kECDHEPSK |
                 SSL_kSM2DHE | SSL_kSM2PSK | SSL_kSRP)) {
        return 1;
    }
 
    return 0;
}
 
/*
 * ossl_statem_client_read_transition() encapsulates the logic for the allowed
 * handshake state transitions when the client is reading messages from the
 * server. The message type that the server has sent is provided in |mt|. The
 * current state is in |s->statem.hand_state|.
 *
 *  Return values are:
 *  1: Success (transition allowed)
 *  0: Error (transition not allowed)
 */
int ossl_statem_client_read_transition(SSL *s, int mt)
{
    OSSL_STATEM *st = &s->statem;
    int ske_expected;
 
    switch (st->hand_state) {
    case TLS_ST_CW_CLNT_HELLO:
        if (mt == SSL3_MT_SERVER_HELLO) {
            st->hand_state = TLS_ST_CR_SRVR_HELLO;
            return 1;
        }
 
        if (SSL_IS_DTLS(s)) {
            if (mt == DTLS1_MT_HELLO_VERIFY_REQUEST) {
                st->hand_state = DTLS_ST_CR_HELLO_VERIFY_REQUEST;
                return 1;
            }
        }
        break;
 
    case TLS_ST_CR_SRVR_HELLO:
        if (s->hit) {
            if (s->tlsext_ticket_expected) {
                if (mt == SSL3_MT_NEWSESSION_TICKET) {
                    st->hand_state = TLS_ST_CR_SESSION_TICKET;
                    return 1;
                }
            } else if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
                st->hand_state = TLS_ST_CR_CHANGE;
                return 1;
            }
        } else {
            if (SSL_IS_DTLS(s) && mt == DTLS1_MT_HELLO_VERIFY_REQUEST) {
                st->hand_state = DTLS_ST_CR_HELLO_VERIFY_REQUEST;
                return 1;
            } else if (s->version >= TLS1_VERSION
                       && s->tls_session_secret_cb != NULL
                       && s->session->tlsext_tick != NULL
                       && mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
                /*
                 * Normally, we can tell if the server is resuming the session
                 * from the session ID. EAP-FAST (RFC 4851), however, relies on
                 * the next server message after the ServerHello to determine if
                 * the server is resuming.
                 */
                s->hit = 1;
                st->hand_state = TLS_ST_CR_CHANGE;
                return 1;
            } else if (!(s->s3->tmp.new_cipher->algorithm_auth
                         & (SSL_aNULL | SSL_aSRP | SSL_aPSK))) {
                if (mt == SSL3_MT_CERTIFICATE) {
                    st->hand_state = TLS_ST_CR_CERT;
                    return 1;
                }
            } else {
                ske_expected = key_exchange_expected(s);
                /* SKE is optional for some PSK ciphersuites */
                if (ske_expected
                    || ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)
                        && mt == SSL3_MT_SERVER_KEY_EXCHANGE)) {
                    if (mt == SSL3_MT_SERVER_KEY_EXCHANGE) {
                        st->hand_state = TLS_ST_CR_KEY_EXCH;
                        return 1;
                    }
                } else if (mt == SSL3_MT_CERTIFICATE_REQUEST
                           && cert_req_allowed(s)) {
                    st->hand_state = TLS_ST_CR_CERT_REQ;
                    return 1;
                } else if (mt == SSL3_MT_SERVER_DONE) {
                    st->hand_state = TLS_ST_CR_SRVR_DONE;
                    return 1;
                }
            }
        }
        break;
 
    case TLS_ST_CR_CERT:
        /*
         * The CertificateStatus message is optional even if
         * |tlsext_status_expected| is set
         */
        if (s->tlsext_status_expected && mt == SSL3_MT_CERTIFICATE_STATUS) {
            st->hand_state = TLS_ST_CR_CERT_STATUS;
            return 1;
        }
        /* Fall through */
 
    case TLS_ST_CR_CERT_STATUS:
        ske_expected = key_exchange_expected(s);
        /* SKE is optional for some PSK ciphersuites */
        if (ske_expected || ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)
                             && mt == SSL3_MT_SERVER_KEY_EXCHANGE)) {
            if (mt == SSL3_MT_SERVER_KEY_EXCHANGE) {
                st->hand_state = TLS_ST_CR_KEY_EXCH;
                return 1;
            }
            goto err;
        }
        /* Fall through */
 
    case TLS_ST_CR_KEY_EXCH:
        if (mt == SSL3_MT_CERTIFICATE_REQUEST) {
            if (cert_req_allowed(s)) {
                st->hand_state = TLS_ST_CR_CERT_REQ;
                return 1;
            }
            goto err;
        }
        /* Fall through */
 
    case TLS_ST_CR_CERT_REQ:
        if (mt == SSL3_MT_SERVER_DONE) {
            st->hand_state = TLS_ST_CR_SRVR_DONE;
            return 1;
        }
        break;
 
    case TLS_ST_CW_FINISHED:
        if (s->tlsext_ticket_expected) {
            if (mt == SSL3_MT_NEWSESSION_TICKET) {
                st->hand_state = TLS_ST_CR_SESSION_TICKET;
                return 1;
            }
        } else if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
            st->hand_state = TLS_ST_CR_CHANGE;
            return 1;
        }
        break;
 
    case TLS_ST_CR_SESSION_TICKET:
        if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
            st->hand_state = TLS_ST_CR_CHANGE;
            return 1;
        }
        break;
 
    case TLS_ST_CR_CHANGE:
        if (mt == SSL3_MT_FINISHED) {
            st->hand_state = TLS_ST_CR_FINISHED;
            return 1;
        }
        break;
 
    default:
        break;
    }
 
 err:
    /* No valid transition found */
    ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE);
    SSLerr(SSL_F_OSSL_STATEM_CLIENT_READ_TRANSITION, SSL_R_UNEXPECTED_MESSAGE);
    return 0;
}
 
/*
 * client_write_transition() works out what handshake state to move to next
 * when the client is writing messages to be sent to the server.
 */
WRITE_TRAN ossl_statem_client_write_transition(SSL *s)
{
    OSSL_STATEM *st = &s->statem;
 
    switch (st->hand_state) {
    case TLS_ST_OK:
        /* Renegotiation - fall through */
    case TLS_ST_BEFORE:
        st->hand_state = TLS_ST_CW_CLNT_HELLO;
        return WRITE_TRAN_CONTINUE;
 
    case TLS_ST_CW_CLNT_HELLO:
        /*
         * No transition at the end of writing because we don't know what
         * we will be sent
         */
        return WRITE_TRAN_FINISHED;
 
    case DTLS_ST_CR_HELLO_VERIFY_REQUEST:
        st->hand_state = TLS_ST_CW_CLNT_HELLO;
        return WRITE_TRAN_CONTINUE;
 
    case TLS_ST_CR_SRVR_DONE:
        if (s->s3->tmp.cert_req)
            st->hand_state = TLS_ST_CW_CERT;
        else
            st->hand_state = TLS_ST_CW_KEY_EXCH;
        return WRITE_TRAN_CONTINUE;
 
    case TLS_ST_CW_CERT:
        st->hand_state = TLS_ST_CW_KEY_EXCH;
        return WRITE_TRAN_CONTINUE;
 
    case TLS_ST_CW_KEY_EXCH:
        /*
         * For TLS, cert_req is set to 2, so a cert chain of nothing is
         * sent, but no verify packet is sent
         */
        /*
         * XXX: For now, we do not support client authentication in ECDH
         * cipher suites with ECDH (rather than ECDSA) certificates. We
         * need to skip the certificate verify message when client's
         * ECDH public key is sent inside the client certificate.
         */
        if (s->s3->tmp.cert_req == 1) {
            st->hand_state = TLS_ST_CW_CERT_VRFY;
        } else {
            st->hand_state = TLS_ST_CW_CHANGE;
        }
        if (s->s3->flags & TLS1_FLAGS_SKIP_CERT_VERIFY) {
            st->hand_state = TLS_ST_CW_CHANGE;
        }
        return WRITE_TRAN_CONTINUE;
 
    case TLS_ST_CW_CERT_VRFY:
        st->hand_state = TLS_ST_CW_CHANGE;
        return WRITE_TRAN_CONTINUE;
 
    case TLS_ST_CW_CHANGE:
#if defined(OPENSSL_NO_NEXTPROTONEG)
        st->hand_state = TLS_ST_CW_FINISHED;
#else
        if (!SSL_IS_DTLS(s) && s->s3->next_proto_neg_seen)
            st->hand_state = TLS_ST_CW_NEXT_PROTO;
        else
            st->hand_state = TLS_ST_CW_FINISHED;
#endif
        return WRITE_TRAN_CONTINUE;
 
#if !defined(OPENSSL_NO_NEXTPROTONEG)
    case TLS_ST_CW_NEXT_PROTO:
        st->hand_state = TLS_ST_CW_FINISHED;
        return WRITE_TRAN_CONTINUE;
#endif
 
    case TLS_ST_CW_FINISHED:
        if (s->hit) {
            st->hand_state = TLS_ST_OK;
            ossl_statem_set_in_init(s, 0);
            return WRITE_TRAN_CONTINUE;
        } else {
            return WRITE_TRAN_FINISHED;
        }
 
    case TLS_ST_CR_FINISHED:
        if (s->hit) {
            st->hand_state = TLS_ST_CW_CHANGE;
            return WRITE_TRAN_CONTINUE;
        } else {
            st->hand_state = TLS_ST_OK;
            ossl_statem_set_in_init(s, 0);
            return WRITE_TRAN_CONTINUE;
        }
 
    default:
        /* Shouldn't happen */
        return WRITE_TRAN_ERROR;
    }
}
 
/*
 * Perform any pre work that needs to be done prior to sending a message from
 * the client to the server.
 */
WORK_STATE ossl_statem_client_pre_work(SSL *s, WORK_STATE wst)
{
    OSSL_STATEM *st = &s->statem;
 
    switch (st->hand_state) {
    case TLS_ST_CW_CLNT_HELLO:
        s->shutdown = 0;
        if (SSL_IS_DTLS(s)) {
            /* every DTLS ClientHello resets Finished MAC */
            if (!ssl3_init_finished_mac(s)) {
                ossl_statem_set_error(s);
                return WORK_ERROR;
            }
        }
        break;
 
    case TLS_ST_CW_CHANGE:
        if (SSL_IS_DTLS(s)) {
            if (s->hit) {
                /*
                 * We're into the last flight so we don't retransmit these
                 * messages unless we need to.
                 */
                st->use_timer = 0;
            }
#ifndef OPENSSL_NO_SCTP
            if (BIO_dgram_is_sctp(SSL_get_wbio(s)))
                return dtls_wait_for_dry(s);
#endif
        }
        return WORK_FINISHED_CONTINUE;
 
    case TLS_ST_OK:
        return tls_finish_handshake(s, wst);
 
    default:
        /* No pre work to be done */
        break;
    }
 
    return WORK_FINISHED_CONTINUE;
}
 
/*
 * Perform any work that needs to be done after sending a message from the
 * client to the server.
 */
WORK_STATE ossl_statem_client_post_work(SSL *s, WORK_STATE wst)
{
    OSSL_STATEM *st = &s->statem;
 
    s->init_num = 0;
 
    switch (st->hand_state) {
    case TLS_ST_CW_CLNT_HELLO:
        if (wst == WORK_MORE_A && statem_flush(s) != 1)
            return WORK_MORE_A;
 
        if (SSL_IS_DTLS(s)) {
            /* Treat the next message as the first packet */
            s->first_packet = 1;
        }
        break;
 
    case TLS_ST_CW_KEY_EXCH:
        if (tls_client_key_exchange_post_work(s) == 0)
            return WORK_ERROR;
        break;
 
    case TLS_ST_CW_CHANGE:
        s->session->cipher = s->s3->tmp.new_cipher;
#ifdef OPENSSL_NO_COMP
        s->session->compress_meth = 0;
#else
        if (s->s3->tmp.new_compression == NULL)
            s->session->compress_meth = 0;
        else
            s->session->compress_meth = s->s3->tmp.new_compression->id;
#endif
        if (!s->method->ssl3_enc->setup_key_block(s))
            return WORK_ERROR;
 
        if (!s->method->ssl3_enc->change_cipher_state(s,
                                                      SSL3_CHANGE_CIPHER_CLIENT_WRITE))
            return WORK_ERROR;
 
        if (SSL_IS_DTLS(s)) {
#ifndef OPENSSL_NO_SCTP
            if (s->hit) {
                /*
                 * Change to new shared key of SCTP-Auth, will be ignored if
                 * no SCTP used.
                 */
                BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
                         0, NULL);
            }
#endif
 
            dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
        }
        break;
 
    case TLS_ST_CW_FINISHED:
#ifndef OPENSSL_NO_SCTP
        if (wst == WORK_MORE_A && SSL_IS_DTLS(s) && s->hit == 0) {
            /*
             * Change to new shared key of SCTP-Auth, will be ignored if
             * no SCTP used.
             */
            BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
                     0, NULL);
        }
#endif
        if (statem_flush(s) != 1)
            return WORK_MORE_B;
        break;
 
    default:
        /* No post work to be done */
        break;
    }
 
    return WORK_FINISHED_CONTINUE;
}
 
/*
 * Construct a message to be sent from the client to the server.
 *
 * Valid return values are:
 *   1: Success
 *   0: Error
 */
int ossl_statem_client_construct_message(SSL *s)
{
    OSSL_STATEM *st = &s->statem;
 
    switch (st->hand_state) {
    case TLS_ST_CW_CLNT_HELLO:
        return tls_construct_client_hello(s);
 
    case TLS_ST_CW_CERT:
#ifndef OPENSSL_NO_GMTLS
        if (SSL_IS_GMTLS(s))
            return gmtls_construct_client_certificate(s);
        else
#endif
            return tls_construct_client_certificate(s);
 
    case TLS_ST_CW_KEY_EXCH:
#ifndef OPENSSL_NO_GMTLS
        if (SSL_IS_GMTLS(s))
            return gmtls_construct_client_key_exchange(s);
        else
#endif
            return tls_construct_client_key_exchange(s);
 
    case TLS_ST_CW_CERT_VRFY:
        return tls_construct_client_verify(s);
 
    case TLS_ST_CW_CHANGE:
        if (SSL_IS_DTLS(s))
            return dtls_construct_change_cipher_spec(s);
        else
            return tls_construct_change_cipher_spec(s);
 
#if !defined(OPENSSL_NO_NEXTPROTONEG)
    case TLS_ST_CW_NEXT_PROTO:
        return tls_construct_next_proto(s);
#endif
    case TLS_ST_CW_FINISHED:
        return tls_construct_finished(s,
                                      s->method->
                                      ssl3_enc->client_finished_label,
                                      s->method->
                                      ssl3_enc->client_finished_label_len);
 
    default:
        /* Shouldn't happen */
        break;
    }
 
    return 0;
}
 
/*
 * Returns the maximum allowed length for the current message that we are
 * reading. Excludes the message header.
 */
unsigned long ossl_statem_client_max_message_size(SSL *s)
{
    OSSL_STATEM *st = &s->statem;
 
    switch (st->hand_state) {
    case TLS_ST_CR_SRVR_HELLO:
        return SERVER_HELLO_MAX_LENGTH;
 
    case DTLS_ST_CR_HELLO_VERIFY_REQUEST:
        return HELLO_VERIFY_REQUEST_MAX_LENGTH;
 
    case TLS_ST_CR_CERT:
        return s->max_cert_list;
 
    case TLS_ST_CR_CERT_STATUS:
        return SSL3_RT_MAX_PLAIN_LENGTH;
 
    case TLS_ST_CR_KEY_EXCH:
        return SERVER_KEY_EXCH_MAX_LENGTH;
 
    case TLS_ST_CR_CERT_REQ:
        /*
         * Set to s->max_cert_list for compatibility with previous releases. In
         * practice these messages can get quite long if servers are configured
         * to provide a long list of acceptable CAs
         */
        return s->max_cert_list;
 
    case TLS_ST_CR_SRVR_DONE:
        return SERVER_HELLO_DONE_MAX_LENGTH;
 
    case TLS_ST_CR_CHANGE:
        if (s->version == DTLS1_BAD_VER)
            return 3;
        return CCS_MAX_LENGTH;
 
    case TLS_ST_CR_SESSION_TICKET:
        return SSL3_RT_MAX_PLAIN_LENGTH;
 
    case TLS_ST_CR_FINISHED:
        return FINISHED_MAX_LENGTH;
 
    default:
        /* Shouldn't happen */
        break;
    }
 
    return 0;
}
 
/*
 * Process a message that the client has been received from the server.
 */
MSG_PROCESS_RETURN ossl_statem_client_process_message(SSL *s, PACKET *pkt)
{
    OSSL_STATEM *st = &s->statem;
 
    switch (st->hand_state) {
    case TLS_ST_CR_SRVR_HELLO:
        return tls_process_server_hello(s, pkt);
 
    case DTLS_ST_CR_HELLO_VERIFY_REQUEST:
        return dtls_process_hello_verify(s, pkt);
 
    case TLS_ST_CR_CERT:
#ifndef OPENSSL_NO_GMTLS
        if (SSL_IS_GMTLS(s))
            return tls_process_server_certificate(s, pkt);
#endif
        return tls_process_server_certificate(s, pkt);
 
    case TLS_ST_CR_CERT_STATUS:
        return tls_process_cert_status(s, pkt);
 
    case TLS_ST_CR_KEY_EXCH:
#ifndef OPENSSL_NO_GMTLS
        if (SSL_IS_GMTLS(s))
            return gmtls_process_server_key_exchange(s, pkt);
#endif
        return tls_process_server_key_exchange(s, pkt);
 
    case TLS_ST_CR_CERT_REQ:
        return tls_process_certificate_request(s, pkt);
 
    case TLS_ST_CR_SRVR_DONE:
        return tls_process_server_done(s, pkt);
 
    case TLS_ST_CR_CHANGE:
        return tls_process_change_cipher_spec(s, pkt);
 
    case TLS_ST_CR_SESSION_TICKET:
        return tls_process_new_session_ticket(s, pkt);
 
    case TLS_ST_CR_FINISHED:
        return tls_process_finished(s, pkt);
 
    default:
        /* Shouldn't happen */
        break;
    }
 
    return MSG_PROCESS_ERROR;
}
 
/*
 * Perform any further processing required following the receipt of a message
 * from the server
 */
WORK_STATE ossl_statem_client_post_process_message(SSL *s, WORK_STATE wst)
{
    OSSL_STATEM *st = &s->statem;
 
    switch (st->hand_state) {
    case TLS_ST_CR_CERT_REQ:
        return tls_prepare_client_certificate(s, wst);
 
#ifndef OPENSSL_NO_SCTP
    case TLS_ST_CR_SRVR_DONE:
        /* We only get here if we are using SCTP and we are renegotiating */
        if (BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
            s->s3->in_read_app_data = 2;
            s->rwstate = SSL_READING;
            BIO_clear_retry_flags(SSL_get_rbio(s));
            BIO_set_retry_read(SSL_get_rbio(s));
            ossl_statem_set_sctp_read_sock(s, 1);
            return WORK_MORE_A;
        }
        ossl_statem_set_sctp_read_sock(s, 0);
        return WORK_FINISHED_STOP;
#endif
 
    default:
        break;
    }
 
    /* Shouldn't happen */
    return WORK_ERROR;
}
 
int tls_construct_client_hello(SSL *s)
{
    unsigned char *buf;
    unsigned char *p, *d;
    int i;
    int protverr;
    unsigned long l;
    int al = 0;
#ifndef OPENSSL_NO_COMP
    int j;
    SSL_COMP *comp;
#endif
    SSL_SESSION *sess = s->session;
 
    buf = (unsigned char *)s->init_buf->data;
 
    /* Work out what SSL/TLS/DTLS version to use */
    protverr = ssl_set_client_hello_version(s);
    if (protverr != 0) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, protverr);
        goto err;
    }
 
    if ((sess == NULL) || !ssl_version_supported(s, sess->ssl_version) ||
        /*
         * In the case of EAP-FAST, we can have a pre-shared
         * "ticket" without a session ID.
         */
        (!sess->session_id_length && !sess->tlsext_tick) ||
        (sess->not_resumable)) {
        if (!ssl_get_new_session(s, 0))
            goto err;
    }
    /* else use the pre-loaded session */
 
    p = s->s3->client_random;
 
    /*
     * for DTLS if client_random is initialized, reuse it, we are
     * required to use same upon reply to HelloVerify
     */
    if (SSL_IS_DTLS(s)) {
        size_t idx;
        i = 1;
        for (idx = 0; idx < sizeof(s->s3->client_random); idx++) {
            if (p[idx]) {
                i = 0;
                break;
            }
        }
    } else
        i = 1;
 
    if (i && ssl_fill_hello_random(s, 0, p, sizeof(s->s3->client_random)) <= 0)
        goto err;
 
    /* Do the message type and length last */
    d = p = ssl_handshake_start(s);
 
    /*-
     * version indicates the negotiated version: for example from
     * an SSLv2/v3 compatible client hello). The client_version
     * field is the maximum version we permit and it is also
     * used in RSA encrypted premaster secrets. Some servers can
     * choke if we initially report a higher version then
     * renegotiate to a lower one in the premaster secret. This
     * didn't happen with TLS 1.0 as most servers supported it
     * but it can with TLS 1.1 or later if the server only supports
     * 1.0.
     *
     * Possible scenario with previous logic:
     *      1. Client hello indicates TLS 1.2
     *      2. Server hello says TLS 1.0
     *      3. RSA encrypted premaster secret uses 1.2.
     *      4. Handshake proceeds using TLS 1.0.
     *      5. Server sends hello request to renegotiate.
     *      6. Client hello indicates TLS v1.0 as we now
     *         know that is maximum server supports.
     *      7. Server chokes on RSA encrypted premaster secret
     *         containing version 1.0.
     *
     * For interoperability it should be OK to always use the
     * maximum version we support in client hello and then rely
     * on the checking of version to ensure the servers isn't
     * being inconsistent: for example initially negotiating with
     * TLS 1.0 and renegotiating with TLS 1.2. We do this by using
     * client_version in client hello and not resetting it to
     * the negotiated version.
     */
    *(p++) = s->client_version >> 8;
    *(p++) = s->client_version & 0xff;
 
    /* Random stuff */
    memcpy(p, s->s3->client_random, SSL3_RANDOM_SIZE);
    p += SSL3_RANDOM_SIZE;
 
    /* Session ID */
    if (s->new_session)
        i = 0;
    else
        i = s->session->session_id_length;
    *(p++) = i;
    if (i != 0) {
        if (i > (int)sizeof(s->session->session_id)) {
            SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
            goto err;
        }
        memcpy(p, s->session->session_id, i);
        p += i;
    }
 
    /* cookie stuff for DTLS */
    if (SSL_IS_DTLS(s)) {
        if (s->d1->cookie_len > sizeof(s->d1->cookie)) {
            SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
            goto err;
        }
        *(p++) = s->d1->cookie_len;
        memcpy(p, s->d1->cookie, s->d1->cookie_len);
        p += s->d1->cookie_len;
    }
 
    /* Ciphers supported */
    i = ssl_cipher_list_to_bytes(s, SSL_get_ciphers(s), &(p[2]));
    if (i == 0) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, SSL_R_NO_CIPHERS_AVAILABLE);
        goto err;
    }
#ifdef OPENSSL_MAX_TLS1_2_CIPHER_LENGTH
    /*
     * Some servers hang if client hello > 256 bytes as hack workaround
     * chop number of supported ciphers to keep it well below this if we
     * use TLS v1.2
     */
    if (TLS1_get_version(s) >= TLS1_2_VERSION
        && i > OPENSSL_MAX_TLS1_2_CIPHER_LENGTH)
        i = OPENSSL_MAX_TLS1_2_CIPHER_LENGTH & ~1;
#endif
    s2n(i, p);
    p += i;
 
    /* COMPRESSION */
#ifdef OPENSSL_NO_COMP
    *(p++) = 1;
#else
 
    if (!ssl_allow_compression(s) || !s->ctx->comp_methods)
        j = 0;
    else
        j = sk_SSL_COMP_num(s->ctx->comp_methods);
    *(p++) = 1 + j;
    for (i = 0; i < j; i++) {
        comp = sk_SSL_COMP_value(s->ctx->comp_methods, i);
        *(p++) = comp->id;
    }
#endif
    *(p++) = 0;                 /* Add the NULL method */
 
    /* TLS extensions */
    if (ssl_prepare_clienthello_tlsext(s) <= 0) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
        goto err;
    }
    if ((s->version != GMTLS_VERSION) && (p =
         ssl_add_clienthello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
                                    &al)) == NULL) {
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
        SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
        goto err;
    }
 
    l = p - d;
    if (!ssl_set_handshake_header(s, SSL3_MT_CLIENT_HELLO, l)) {
        ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
        SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
        goto err;
    }
 
    return 1;
 err:
    ossl_statem_set_error(s);
    return 0;
}
 
MSG_PROCESS_RETURN dtls_process_hello_verify(SSL *s, PACKET *pkt)
{
    int al;
    unsigned int cookie_len;
    PACKET cookiepkt;
 
    if (!PACKET_forward(pkt, 2)
        || !PACKET_get_length_prefixed_1(pkt, &cookiepkt)) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_DTLS_PROCESS_HELLO_VERIFY, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
 
    cookie_len = PACKET_remaining(&cookiepkt);
    if (cookie_len > sizeof(s->d1->cookie)) {
        al = SSL_AD_ILLEGAL_PARAMETER;
        SSLerr(SSL_F_DTLS_PROCESS_HELLO_VERIFY, SSL_R_LENGTH_TOO_LONG);
        goto f_err;
    }
 
    if (!PACKET_copy_bytes(&cookiepkt, s->d1->cookie, cookie_len)) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_DTLS_PROCESS_HELLO_VERIFY, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
    s->d1->cookie_len = cookie_len;
 
    return MSG_PROCESS_FINISHED_READING;
 f_err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
    ossl_statem_set_error(s);
    return MSG_PROCESS_ERROR;
}
 
MSG_PROCESS_RETURN tls_process_server_hello(SSL *s, PACKET *pkt)
{
    STACK_OF(SSL_CIPHER) *sk;
    const SSL_CIPHER *c;
    PACKET session_id;
    size_t session_id_len;
    const unsigned char *cipherchars;
    int i, al = SSL_AD_INTERNAL_ERROR;
    unsigned int compression;
    unsigned int sversion;
    int protverr;
#ifndef OPENSSL_NO_COMP
    SSL_COMP *comp;
#endif
 
    if (!PACKET_get_net_2(pkt, &sversion)) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
 
    protverr = ssl_choose_client_version(s, sversion);
    if (protverr != 0) {
        al = SSL_AD_PROTOCOL_VERSION;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, protverr);
        goto f_err;
    }
 
    /* load the server hello data */
    /* load the server random */
    if (!PACKET_copy_bytes(pkt, s->s3->server_random, SSL3_RANDOM_SIZE)) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
 
    s->hit = 0;
 
    /* Get the session-id. */
    if (!PACKET_get_length_prefixed_1(pkt, &session_id)) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
    session_id_len = PACKET_remaining(&session_id);
    if (session_id_len > sizeof s->session->session_id
        || session_id_len > SSL3_SESSION_ID_SIZE) {
        al = SSL_AD_ILLEGAL_PARAMETER;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_SSL3_SESSION_ID_TOO_LONG);
        goto f_err;
    }
 
    if (!PACKET_get_bytes(pkt, &cipherchars, TLS_CIPHER_LEN)) {
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH);
        al = SSL_AD_DECODE_ERROR;
        goto f_err;
    }
 
    /*
     * Check if we can resume the session based on external pre-shared secret.
     * EAP-FAST (RFC 4851) supports two types of session resumption.
     * Resumption based on server-side state works with session IDs.
     * Resumption based on pre-shared Protected Access Credentials (PACs)
     * works by overriding the SessionTicket extension at the application
     * layer, and does not send a session ID. (We do not know whether EAP-FAST
     * servers would honour the session ID.) Therefore, the session ID alone
     * is not a reliable indicator of session resumption, so we first check if
     * we can resume, and later peek at the next handshake message to see if the
     * server wants to resume.
     */
    if (s->version >= TLS1_VERSION && s->tls_session_secret_cb &&
        s->session->tlsext_tick) {
        const SSL_CIPHER *pref_cipher = NULL;
        s->session->master_key_length = sizeof(s->session->master_key);
        if (s->tls_session_secret_cb(s, s->session->master_key,
                                     &s->session->master_key_length,
                                     NULL, &pref_cipher,
                                     s->tls_session_secret_cb_arg)) {
            s->session->cipher = pref_cipher ?
                pref_cipher : ssl_get_cipher_by_char(s, cipherchars);
        } else {
            SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
            al = SSL_AD_INTERNAL_ERROR;
            goto f_err;
        }
    }
 
    if (session_id_len != 0 && session_id_len == s->session->session_id_length
        && memcmp(PACKET_data(&session_id), s->session->session_id,
                  session_id_len) == 0) {
        if (s->sid_ctx_length != s->session->sid_ctx_length
            || memcmp(s->session->sid_ctx, s->sid_ctx, s->sid_ctx_length)) {
            /* actually a client application bug */
            al = SSL_AD_ILLEGAL_PARAMETER;
            SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO,
                   SSL_R_ATTEMPT_TO_REUSE_SESSION_IN_DIFFERENT_CONTEXT);
            goto f_err;
        }
        s->hit = 1;
    } else {
        /*
         * If we were trying for session-id reuse but the server
         * didn't echo the ID, make a new SSL_SESSION.
         * In the case of EAP-FAST and PAC, we do not send a session ID,
         * so the PAC-based session secret is always preserved. It'll be
         * overwritten if the server refuses resumption.
         */
        if (s->session->session_id_length > 0) {
            s->ctx->stats.sess_miss++;
            if (!ssl_get_new_session(s, 0)) {
                goto f_err;
            }
        }
 
        s->session->ssl_version = s->version;
        s->session->session_id_length = session_id_len;
        /* session_id_len could be 0 */
        if (session_id_len > 0)
            memcpy(s->session->session_id, PACKET_data(&session_id),
                   session_id_len);
    }
 
    /* Session version and negotiated protocol version should match */
    if (s->version != s->session->ssl_version) {
        al = SSL_AD_PROTOCOL_VERSION;
 
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO,
               SSL_R_SSL_SESSION_VERSION_MISMATCH);
        goto f_err;
    }
 
    c = ssl_get_cipher_by_char(s, cipherchars);
    if (c == NULL) {
        /* unknown cipher */
        al = SSL_AD_ILLEGAL_PARAMETER;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_UNKNOWN_CIPHER_RETURNED);
        goto f_err;
    }
    /*
     * Now that we know the version, update the check to see if it's an allowed
     * version.
     */
    s->s3->tmp.min_ver = s->version;
    s->s3->tmp.max_ver = s->version;
    /*
     * If it is a disabled cipher we either didn't send it in client hello,
     * or it's not allowed for the selected protocol. So we return an error.
     */
    if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_CHECK)) {
        al = SSL_AD_ILLEGAL_PARAMETER;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
        goto f_err;
    }
 
    sk = ssl_get_ciphers_by_id(s);
    i = sk_SSL_CIPHER_find(sk, c);
    if (i < 0) {
        /* we did not say we would use this cipher */
        al = SSL_AD_ILLEGAL_PARAMETER;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_WRONG_CIPHER_RETURNED);
        goto f_err;
    }
 
    /*
     * Depending on the session caching (internal/external), the cipher
     * and/or cipher_id values may not be set. Make sure that cipher_id is
     * set and use it for comparison.
     */
    if (s->session->cipher)
        s->session->cipher_id = s->session->cipher->id;
    if (s->hit && (s->session->cipher_id != c->id)) {
        al = SSL_AD_ILLEGAL_PARAMETER;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO,
               SSL_R_OLD_SESSION_CIPHER_NOT_RETURNED);
        goto f_err;
    }
    s->s3->tmp.new_cipher = c;
    /* lets get the compression algorithm */
    /* COMPRESSION */
    if (!PACKET_get_1(pkt, &compression)) {
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_LENGTH_MISMATCH);
        al = SSL_AD_DECODE_ERROR;
        goto f_err;
    }
#ifdef OPENSSL_NO_COMP
    if (compression != 0) {
        al = SSL_AD_ILLEGAL_PARAMETER;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO,
               SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
        goto f_err;
    }
    /*
     * If compression is disabled we'd better not try to resume a session
     * using compression.
     */
    if (s->session->compress_meth != 0) {
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
        goto f_err;
    }
#else
    if (s->hit && compression != s->session->compress_meth) {
        al = SSL_AD_ILLEGAL_PARAMETER;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO,
               SSL_R_OLD_SESSION_COMPRESSION_ALGORITHM_NOT_RETURNED);
        goto f_err;
    }
    if (compression == 0)
        comp = NULL;
    else if (!ssl_allow_compression(s)) {
        al = SSL_AD_ILLEGAL_PARAMETER;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_COMPRESSION_DISABLED);
        goto f_err;
    } else {
        comp = ssl3_comp_find(s->ctx->comp_methods, compression);
    }
 
    if (compression != 0 && comp == NULL) {
        al = SSL_AD_ILLEGAL_PARAMETER;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO,
               SSL_R_UNSUPPORTED_COMPRESSION_ALGORITHM);
        goto f_err;
    } else {
        s->s3->tmp.new_compression = comp;
    }
#endif
 
    /* TLS extensions */
    if (!ssl_parse_serverhello_tlsext(s, pkt)) {
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_PARSE_TLSEXT);
        goto err;
    }
 
    if (PACKET_remaining(pkt) != 0) {
        /* wrong packet length */
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_HELLO, SSL_R_BAD_PACKET_LENGTH);
        goto f_err;
    }
#ifndef OPENSSL_NO_SCTP
    if (SSL_IS_DTLS(s) && s->hit) {
        unsigned char sctpauthkey[64];
        char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
 
        /*
         * Add new shared key for SCTP-Auth, will be ignored if
         * no SCTP used.
         */
        memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
               sizeof(DTLS1_SCTP_AUTH_LABEL));
 
        if (SSL_export_keying_material(s, sctpauthkey,
                                       sizeof(sctpauthkey),
                                       labelbuffer,
                                       sizeof(labelbuffer), NULL, 0, 0) <= 0)
            goto err;
 
        BIO_ctrl(SSL_get_wbio(s),
                 BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
                 sizeof(sctpauthkey), sctpauthkey);
    }
#endif
 
    return MSG_PROCESS_CONTINUE_READING;
 f_err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
 err:
    ossl_statem_set_error(s);
    return MSG_PROCESS_ERROR;
}
 
MSG_PROCESS_RETURN tls_process_server_certificate(SSL *s, PACKET *pkt)
{
    int al, i, ret = MSG_PROCESS_ERROR, exp_idx;
    unsigned long cert_list_len, cert_len;
    X509 *x = NULL;
    const unsigned char *certstart, *certbytes;
    STACK_OF(X509) *sk = NULL;
    EVP_PKEY *pkey = NULL;
 
    if ((sk = sk_X509_new_null()) == NULL) {
        SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
        goto err;
    }
 
    if (!PACKET_get_net_3(pkt, &cert_list_len)
        || PACKET_remaining(pkt) != cert_list_len) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
    while (PACKET_remaining(pkt)) {
        if (!PACKET_get_net_3(pkt, &cert_len)
            || !PACKET_get_bytes(pkt, &certbytes, cert_len)) {
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE,
                   SSL_R_CERT_LENGTH_MISMATCH);
            goto f_err;
        }
 
        certstart = certbytes;
        x = d2i_X509(NULL, (const unsigned char **)&certbytes, cert_len);
        if (x == NULL) {
            al = SSL_AD_BAD_CERTIFICATE;
            SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, ERR_R_ASN1_LIB);
            goto f_err;
        }
        if (certbytes != (certstart + cert_len)) {
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE,
                   SSL_R_CERT_LENGTH_MISMATCH);
            goto f_err;
        }
        if (!sk_X509_push(sk, x)) {
            SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, ERR_R_MALLOC_FAILURE);
            goto err;
        }
        x = NULL;
    }
 
    i = ssl_verify_cert_chain(s, sk);
    /*
     * The documented interface is that SSL_VERIFY_PEER should be set in order
     * for client side verification of the server certificate to take place.
     * However, historically the code has only checked that *any* flag is set
     * to cause server verification to take place. Use of the other flags makes
     * no sense in client mode. An attempt to clean up the semantics was
     * reverted because at least one application *only* set
     * SSL_VERIFY_FAIL_IF_NO_PEER_CERT. Prior to the clean up this still caused
     * server verification to take place, after the clean up it silently did
     * nothing. SSL_CTX_set_verify()/SSL_set_verify() cannot validate the flags
     * sent to them because they are void functions. Therefore, we now use the
     * (less clean) historic behaviour of performing validation if any flag is
     * set. The *documented* interface remains the same.
     */
    if (s->verify_mode != SSL_VERIFY_NONE && i <= 0) {
        al = ssl_verify_alarm_type(s->verify_result);
        SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE,
               SSL_R_CERTIFICATE_VERIFY_FAILED);
        goto f_err;
    }
    ERR_clear_error();          /* but we keep s->verify_result */
    if (i > 1) {
        SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE, i);
        al = SSL_AD_HANDSHAKE_FAILURE;
        goto f_err;
    }
 
    s->session->peer_chain = sk;
    /*
     * Inconsistency alert: cert_chain does include the peer's certificate,
     * which we don't include in statem_srvr.c
     */
    x = sk_X509_value(sk, 0);
    sk = NULL;
    /*
     * VRS 19990621: possible memory leak; sk=null ==> !sk_pop_free() @end
     */
 
    pkey = X509_get0_pubkey(x);
 
    if (pkey == NULL || EVP_PKEY_missing_parameters(pkey)) {
        x = NULL;
        al = SSL3_AL_FATAL;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE,
               SSL_R_UNABLE_TO_FIND_PUBLIC_KEY_PARAMETERS);
        goto f_err;
    }
 
    i = ssl_cert_type(x, pkey);
    if (i < 0) {
        x = NULL;
        al = SSL3_AL_FATAL;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE,
               SSL_R_UNKNOWN_CERTIFICATE_TYPE);
        goto f_err;
    }
 
    exp_idx = ssl_cipher_get_cert_index(s->s3->tmp.new_cipher);
    if (exp_idx >= 0 && i != exp_idx
        && (exp_idx != SSL_PKEY_GOST_EC ||
            (i != SSL_PKEY_GOST12_512 && i != SSL_PKEY_GOST12_256
             && i != SSL_PKEY_GOST01))) {
        x = NULL;
        al = SSL_AD_ILLEGAL_PARAMETER;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_CERTIFICATE,
               SSL_R_WRONG_CERTIFICATE_TYPE);
        goto f_err;
    }
    s->session->peer_type = i;
 
    X509_free(s->session->peer);
    X509_up_ref(x);
    s->session->peer = x;
    s->session->verify_result = s->verify_result;
 
    x = NULL;
    ret = MSG_PROCESS_CONTINUE_READING;
    goto done;
 
 f_err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
 err:
    ossl_statem_set_error(s);
 done:
    X509_free(x);
    sk_X509_pop_free(sk, X509_free);
    return ret;
}
 
static int tls_process_ske_psk_preamble(SSL *s, PACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_PSK
    PACKET psk_identity_hint;
 
    /* PSK ciphersuites are preceded by an identity hint */
 
    if (!PACKET_get_length_prefixed_2(pkt, &psk_identity_hint)) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_PSK_PREAMBLE, SSL_R_LENGTH_MISMATCH);
        return 0;
    }
 
    /*
     * Store PSK identity hint for later use, hint is used in
     * tls_construct_client_key_exchange.  Assume that the maximum length of
     * a PSK identity hint can be as long as the maximum length of a PSK
     * identity.
     */
    if (PACKET_remaining(&psk_identity_hint) > PSK_MAX_IDENTITY_LEN) {
        *al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_TLS_PROCESS_SKE_PSK_PREAMBLE, SSL_R_DATA_LENGTH_TOO_LONG);
        return 0;
    }
 
    if (PACKET_remaining(&psk_identity_hint) == 0) {
        OPENSSL_free(s->session->psk_identity_hint);
        s->session->psk_identity_hint = NULL;
    } else if (!PACKET_strndup(&psk_identity_hint,
                               &s->session->psk_identity_hint)) {
        *al = SSL_AD_INTERNAL_ERROR;
        return 0;
    }
 
    return 1;
#else
    SSLerr(SSL_F_TLS_PROCESS_SKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
    *al = SSL_AD_INTERNAL_ERROR;
    return 0;
#endif
}
 
static int tls_process_ske_srp(SSL *s, PACKET *pkt, EVP_PKEY **pkey, int *al)
{
#ifndef OPENSSL_NO_SRP
    PACKET prime, generator, salt, server_pub;
 
    if (!PACKET_get_length_prefixed_2(pkt, &prime)
        || !PACKET_get_length_prefixed_2(pkt, &generator)
        || !PACKET_get_length_prefixed_1(pkt, &salt)
        || !PACKET_get_length_prefixed_2(pkt, &server_pub)) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_SRP, SSL_R_LENGTH_MISMATCH);
        return 0;
    }
 
    if ((s->srp_ctx.N =
         BN_bin2bn(PACKET_data(&prime),
                   PACKET_remaining(&prime), NULL)) == NULL
        || (s->srp_ctx.g =
            BN_bin2bn(PACKET_data(&generator),
                      PACKET_remaining(&generator), NULL)) == NULL
        || (s->srp_ctx.s =
            BN_bin2bn(PACKET_data(&salt),
                      PACKET_remaining(&salt), NULL)) == NULL
        || (s->srp_ctx.B =
            BN_bin2bn(PACKET_data(&server_pub),
                      PACKET_remaining(&server_pub), NULL)) == NULL) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_SRP, ERR_R_BN_LIB);
        return 0;
    }
 
    if (!srp_verify_server_param(s, al)) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_SRP, SSL_R_BAD_SRP_PARAMETERS);
        return 0;
    }
 
    /* We must check if there is a certificate */
    if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aRSA | SSL_aDSS))
        *pkey = X509_get0_pubkey(s->session->peer);
 
    return 1;
#else
    SSLerr(SSL_F_TLS_PROCESS_SKE_SRP, ERR_R_INTERNAL_ERROR);
    *al = SSL_AD_INTERNAL_ERROR;
    return 0;
#endif
}
 
static int tls_process_ske_dhe(SSL *s, PACKET *pkt, EVP_PKEY **pkey, int *al)
{
#ifndef OPENSSL_NO_DH
    PACKET prime, generator, pub_key;
    EVP_PKEY *peer_tmp = NULL;
 
    DH *dh = NULL;
    BIGNUM *p = NULL, *g = NULL, *bnpub_key = NULL;
 
    int check_bits = 0;
 
    if (!PACKET_get_length_prefixed_2(pkt, &prime)
        || !PACKET_get_length_prefixed_2(pkt, &generator)
        || !PACKET_get_length_prefixed_2(pkt, &pub_key)) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, SSL_R_LENGTH_MISMATCH);
        return 0;
    }
 
    peer_tmp = EVP_PKEY_new();
    dh = DH_new();
 
    if (peer_tmp == NULL || dh == NULL) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_MALLOC_FAILURE);
        goto err;
    }
 
    p = BN_bin2bn(PACKET_data(&prime), PACKET_remaining(&prime), NULL);
    g = BN_bin2bn(PACKET_data(&generator), PACKET_remaining(&generator), NULL);
    bnpub_key = BN_bin2bn(PACKET_data(&pub_key), PACKET_remaining(&pub_key),
                          NULL);
    if (p == NULL || g == NULL || bnpub_key == NULL) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_BN_LIB);
        goto err;
    }
 
    /* test non-zero pupkey */
    if (BN_is_zero(bnpub_key)) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, SSL_R_BAD_DH_VALUE);
        goto err;
    }
 
    if (!DH_set0_pqg(dh, p, NULL, g)) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_BN_LIB);
        goto err;
    }
    p = g = NULL;
 
    if (DH_check_params(dh, &check_bits) == 0 || check_bits != 0) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, SSL_R_BAD_DH_VALUE);
        goto err;
    }
 
    if (!DH_set0_key(dh, bnpub_key, NULL)) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_BN_LIB);
        goto err;
    }
    bnpub_key = NULL;
 
    if (!ssl_security(s, SSL_SECOP_TMP_DH, DH_security_bits(dh), 0, dh)) {
        *al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, SSL_R_DH_KEY_TOO_SMALL);
        goto err;
    }
 
    if (EVP_PKEY_assign_DH(peer_tmp, dh) == 0) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_EVP_LIB);
        goto err;
    }
 
    s->s3->peer_tmp = peer_tmp;
 
    /*
     * FIXME: This makes assumptions about which ciphersuites come with
     * public keys. We should have a less ad-hoc way of doing this
     */
    if (s->s3->tmp.new_cipher->algorithm_auth & (SSL_aRSA | SSL_aDSS))
        *pkey = X509_get0_pubkey(s->session->peer);
    /* else anonymous DH, so no certificate or pkey. */
 
    return 1;
 
 err:
    BN_free(p);
    BN_free(g);
    BN_free(bnpub_key);
    DH_free(dh);
    EVP_PKEY_free(peer_tmp);
 
    return 0;
#else
    SSLerr(SSL_F_TLS_PROCESS_SKE_DHE, ERR_R_INTERNAL_ERROR);
    *al = SSL_AD_INTERNAL_ERROR;
    return 0;
#endif
}
 
static int tls_process_ske_ecdhe(SSL *s, PACKET *pkt, EVP_PKEY **pkey, int *al)
{
#ifndef OPENSSL_NO_EC
    PACKET encoded_pt;
    const unsigned char *ecparams;
    int curve_nid;
    unsigned int curve_flags;
    EVP_PKEY_CTX *pctx = NULL;
 
    /*
     * Extract elliptic curve parameters and the server's ephemeral ECDH
     * public key. For now we only support named (not generic) curves and
     * ECParameters in this case is just three bytes.
     */
    if (!PACKET_get_bytes(pkt, &ecparams, 3)) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, SSL_R_LENGTH_TOO_SHORT);
        return 0;
    }
    /*
     * Check curve is one of our preferences, if not server has sent an
     * invalid curve. ECParameters is 3 bytes.
     */
    if (!tls1_check_curve(s, ecparams, 3)) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, SSL_R_WRONG_CURVE);
        return 0;
    }
 
    curve_nid = tls1_ec_curve_id2nid(*(ecparams + 2), &curve_flags);
 
    if (curve_nid == 0) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE,
               SSL_R_UNABLE_TO_FIND_ECDH_PARAMETERS);
        return 0;
    }
 
    if ((curve_flags & TLS_CURVE_TYPE) == TLS_CURVE_CUSTOM) {
        EVP_PKEY *key = EVP_PKEY_new();
 
        if (key == NULL || !EVP_PKEY_set_type(key, curve_nid)) {
            *al = SSL_AD_INTERNAL_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, ERR_R_EVP_LIB);
            EVP_PKEY_free(key);
            return 0;
        }
        s->s3->peer_tmp = key;
    } else {
        /* Set up EVP_PKEY with named curve as parameters */
        pctx = EVP_PKEY_CTX_new_id(EVP_PKEY_EC, NULL);
        if (pctx == NULL
            || EVP_PKEY_paramgen_init(pctx) <= 0
            || EVP_PKEY_CTX_set_ec_paramgen_curve_nid(pctx, curve_nid) <= 0
            || EVP_PKEY_paramgen(pctx, &s->s3->peer_tmp) <= 0) {
            *al = SSL_AD_INTERNAL_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, ERR_R_EVP_LIB);
            EVP_PKEY_CTX_free(pctx);
            return 0;
        }
        EVP_PKEY_CTX_free(pctx);
        pctx = NULL;
    }
 
    if (!PACKET_get_length_prefixed_1(pkt, &encoded_pt)) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, SSL_R_LENGTH_MISMATCH);
        return 0;
    }
 
    /* parse remote ephem point */
    if (!EVP_PKEY_set1_tls_encodedpoint(s->s3->peer_tmp,
                                        PACKET_data(&encoded_pt),
                                        PACKET_remaining(&encoded_pt))) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, SSL_R_BAD_ECPOINT);
        return 0;
    }
 
    /*
     * The ECC/TLS specification does not mention the use of DSA to sign
     * ECParameters in the server key exchange message. We do support RSA
     * and ECDSA.
     */
    if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aECDSA)
        *pkey = X509_get0_pubkey(s->session->peer);
#ifndef OPENSSL_NO_SM2
    else if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSM2)
        *pkey = X509_get0_pubkey(s->session->peer);
#endif
    else if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aRSA)
        *pkey = X509_get0_pubkey(s->session->peer);
    /* else anonymous ECDH, so no certificate or pkey. */
 
    return 1;
#else
    SSLerr(SSL_F_TLS_PROCESS_SKE_ECDHE, ERR_R_INTERNAL_ERROR);
    *al = SSL_AD_INTERNAL_ERROR;
    return 0;
#endif
}
 
MSG_PROCESS_RETURN tls_process_server_key_exchange(SSL *s, PACKET *pkt)
{
    int al = -1;
    long alg_k;
    EVP_PKEY *pkey = NULL;
    PACKET save_param_start, signature;
 
    alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 
    save_param_start = *pkt;
 
#if !defined(OPENSSL_NO_EC) || !defined(OPENSSL_NO_DH)
    EVP_PKEY_free(s->s3->peer_tmp);
    s->s3->peer_tmp = NULL;
#endif
 
    if (alg_k & SSL_PSK) {
        if (!tls_process_ske_psk_preamble(s, pkt, &al))
            goto err;
    }
 
    /* Nothing else to do for plain PSK or RSAPSK */
    if (alg_k & (SSL_kPSK | SSL_kRSAPSK)) {
    } else if (alg_k & SSL_kSRP) {
        if (!tls_process_ske_srp(s, pkt, &pkey, &al))
            goto err;
    } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
        if (!tls_process_ske_dhe(s, pkt, &pkey, &al))
            goto err;
    } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK | SSL_kSM2DHE | SSL_kSM2PSK)) {
        if (!tls_process_ske_ecdhe(s, pkt, &pkey, &al))
            goto err;
    } else if (alg_k) {
        al = SSL_AD_UNEXPECTED_MESSAGE;
        SSLerr(SSL_F_TLS_PROCESS_SERVER_KEY_EXCHANGE, SSL_R_UNEXPECTED_MESSAGE);
        goto err;
    }
 
    /* if it was signed, check the signature */
    if (pkey != NULL) {
        PACKET params;
        int maxsig;
        const EVP_MD *md = NULL;
        EVP_MD_CTX *md_ctx;
 
        /*
         * |pkt| now points to the beginning of the signature, so the difference
         * equals the length of the parameters.
         */
        if (!PACKET_get_sub_packet(&save_param_start, &params,
                                   PACKET_remaining(&save_param_start) -
                                   PACKET_remaining(pkt))) {
            al = SSL_AD_INTERNAL_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
            goto err;
        }
 
        if (SSL_USE_SIGALGS(s)) {
            const unsigned char *sigalgs;
            int rv;
            if (!PACKET_get_bytes(pkt, &sigalgs, 2)) {
                al = SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_TLS_PROCESS_SERVER_KEY_EXCHANGE, SSL_R_LENGTH_TOO_SHORT);
                goto err;
            }
            rv = tls12_check_peer_sigalg(&md, s, sigalgs, pkey);
            if (rv == -1) {
                al = SSL_AD_INTERNAL_ERROR;
                goto err;
            } else if (rv == 0) {
                al = SSL_AD_DECODE_ERROR;
                goto err;
            }
#ifdef SSL_DEBUG
            fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
#endif
#ifndef OPENSSL_NO_RSA
        } else if (EVP_PKEY_id(pkey) == EVP_PKEY_RSA) {
# if !defined(OPENSSL_NO_MD5) && !defined(OPENSSL_NO_SHA)
            md = EVP_md5_sha1();
# elif !defined(OPENSSL_NO_SM3)
            md = EVP_sm3();
# else
            should_not_happen!!			
# endif
#endif
#ifndef OPENSSL_NO_GMTLS
        } else if (s->method->version == GMTLS_VERSION
                   && s->s3->tmp.new_cipher->algorithm_mac & SSL_SM3) {
            md = EVP_sm3();
#endif
#ifndef OPENSSL_NO_SHA
        } else {
            md = EVP_sha1();
#endif
        }
 
        if (!PACKET_get_length_prefixed_2(pkt, &signature)
            || PACKET_remaining(pkt) != 0) {
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_SERVER_KEY_EXCHANGE, SSL_R_LENGTH_MISMATCH);
            goto err;
        }
        maxsig = EVP_PKEY_size(pkey);
        if (maxsig < 0) {
            al = SSL_AD_INTERNAL_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
            goto err;
        }
 
        /*
         * Check signature length
         */
        if (PACKET_remaining(&signature) > (size_t)maxsig) {
            /* wrong packet length */
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_SERVER_KEY_EXCHANGE,
                   SSL_R_WRONG_SIGNATURE_LENGTH);
            goto err;
        }
 
        md_ctx = EVP_MD_CTX_new();
        if (md_ctx == NULL) {
            al = SSL_AD_INTERNAL_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
            goto err;
        }
 
        if (EVP_VerifyInit_ex(md_ctx, md, NULL) <= 0) {
            EVP_MD_CTX_free(md_ctx);
            al = SSL_AD_INTERNAL_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB);
            goto err;
        }
 
#ifndef OPENSSL_NO_SM2
        if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSM2) {
            unsigned char z[EVP_MAX_MD_SIZE];
            size_t zlen = sizeof(z);
            char *id = SM2_DEFAULT_ID;
            if (!SM2_compute_id_digest(md, id, strlen(id), z, &zlen,
                EVP_PKEY_get0_EC_KEY(pkey))) {
                al = SSL_AD_INTERNAL_ERROR;
                SSLerr(SSL_F_TLS_PROCESS_SERVER_KEY_EXCHANGE, ERR_R_SM2_LIB);
                goto err;
            }
            if (EVP_VerifyUpdate(md_ctx, z, zlen) <= 0) {
                al = SSL_AD_INTERNAL_ERROR;
                SSLerr(SSL_F_TLS_PROCESS_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB);
                goto err;
            }
        }
#endif
 
        if (EVP_VerifyUpdate(md_ctx, &(s->s3->client_random[0]),
                             SSL3_RANDOM_SIZE) <= 0
            || EVP_VerifyUpdate(md_ctx, &(s->s3->server_random[0]),
                                SSL3_RANDOM_SIZE) <= 0
            || EVP_VerifyUpdate(md_ctx, PACKET_data(&params),
                                PACKET_remaining(&params)) <= 0) {
            EVP_MD_CTX_free(md_ctx);
            al = SSL_AD_INTERNAL_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB);
            goto err;
        }
        if (EVP_VerifyFinal(md_ctx, PACKET_data(&signature),
                            PACKET_remaining(&signature), pkey) <= 0) {
            /* bad signature */
            EVP_MD_CTX_free(md_ctx);
            al = SSL_AD_DECRYPT_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_SERVER_KEY_EXCHANGE, SSL_R_BAD_SIGNATURE);
            goto err;
        }
        EVP_MD_CTX_free(md_ctx);
    } else {
        /* aNULL, aSRP or PSK do not need public keys */
        if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
            && !(alg_k & SSL_PSK)) {
            /* Might be wrong key type, check it */
            if (ssl3_check_cert_and_algorithm(s)) {
                /* Otherwise this shouldn't happen */
                al = SSL_AD_INTERNAL_ERROR;
                SSLerr(SSL_F_TLS_PROCESS_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
            } else {
                al = SSL_AD_DECODE_ERROR;
            }
            goto err;
        }
        /* still data left over */
        if (PACKET_remaining(pkt) != 0) {
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_SERVER_KEY_EXCHANGE, SSL_R_EXTRA_DATA_IN_MESSAGE);
            goto err;
        }
    }
 
    return MSG_PROCESS_CONTINUE_READING;
 err:
    if (al != -1)
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
    ossl_statem_set_error(s);
    return MSG_PROCESS_ERROR;
}
 
MSG_PROCESS_RETURN tls_process_certificate_request(SSL *s, PACKET *pkt)
{
    int ret = MSG_PROCESS_ERROR;
    unsigned int list_len, ctype_num, i, name_len;
    X509_NAME *xn = NULL;
    const unsigned char *data;
    const unsigned char *namestart, *namebytes;
    STACK_OF(X509_NAME) *ca_sk = NULL;
 
    if ((ca_sk = sk_X509_NAME_new(ca_dn_cmp)) == NULL) {
        SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
        goto err;
    }
 
    /* get the certificate types */
    if (!PACKET_get_1(pkt, &ctype_num)
        || !PACKET_get_bytes(pkt, &data, ctype_num)) {
        ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
        SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH);
        goto err;
    }
    OPENSSL_free(s->cert->ctypes);
    s->cert->ctypes = NULL;
    if (ctype_num > SSL3_CT_NUMBER) {
        /* If we exceed static buffer copy all to cert structure */
        s->cert->ctypes = OPENSSL_malloc(ctype_num);
        if (s->cert->ctypes == NULL) {
            SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
            goto err;
        }
        memcpy(s->cert->ctypes, data, ctype_num);
        s->cert->ctype_num = (size_t)ctype_num;
        ctype_num = SSL3_CT_NUMBER;
    }
    for (i = 0; i < ctype_num; i++)
        s->s3->tmp.ctype[i] = data[i];
 
    if (SSL_USE_SIGALGS(s)) {
        if (!PACKET_get_net_2(pkt, &list_len)
            || !PACKET_get_bytes(pkt, &data, list_len)) {
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
            SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST,
                   SSL_R_LENGTH_MISMATCH);
            goto err;
        }
 
        /* Clear certificate digests and validity flags */
        for (i = 0; i < SSL_PKEY_NUM; i++) {
            s->s3->tmp.md[i] = NULL;
            s->s3->tmp.valid_flags[i] = 0;
        }
        if ((list_len & 1) || !tls1_save_sigalgs(s, data, list_len)) {
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
            SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST,
                   SSL_R_SIGNATURE_ALGORITHMS_ERROR);
            goto err;
        }
        if (!tls1_process_sigalgs(s)) {
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
            SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
            goto err;
        }
    } else {
        ssl_set_default_md(s);
    }
 
    /* get the CA RDNs */
    if (!PACKET_get_net_2(pkt, &list_len)
        || PACKET_remaining(pkt) != list_len) {
        ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
        SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, SSL_R_LENGTH_MISMATCH);
        goto err;
    }
 
    while (PACKET_remaining(pkt)) {
        if (!PACKET_get_net_2(pkt, &name_len)
            || !PACKET_get_bytes(pkt, &namebytes, name_len)) {
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
            SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST,
                   SSL_R_LENGTH_MISMATCH);
            goto err;
        }
 
        namestart = namebytes;
 
        if ((xn = d2i_X509_NAME(NULL, (const unsigned char **)&namebytes,
                                name_len)) == NULL) {
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
            SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_ASN1_LIB);
            goto err;
        }
 
        if (namebytes != (namestart + name_len)) {
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
            SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST,
                   SSL_R_CA_DN_LENGTH_MISMATCH);
            goto err;
        }
        if (!sk_X509_NAME_push(ca_sk, xn)) {
            SSLerr(SSL_F_TLS_PROCESS_CERTIFICATE_REQUEST, ERR_R_MALLOC_FAILURE);
            goto err;
        }
        xn = NULL;
    }
 
    /* we should setup a certificate to return.... */
    s->s3->tmp.cert_req = 1;
    s->s3->tmp.ctype_num = ctype_num;
    sk_X509_NAME_pop_free(s->s3->tmp.ca_names, X509_NAME_free);
    s->s3->tmp.ca_names = ca_sk;
    ca_sk = NULL;
 
    ret = MSG_PROCESS_CONTINUE_PROCESSING;
    goto done;
 err:
    ossl_statem_set_error(s);
 done:
    X509_NAME_free(xn);
    sk_X509_NAME_pop_free(ca_sk, X509_NAME_free);
    return ret;
}
 
static int ca_dn_cmp(const X509_NAME *const *a, const X509_NAME *const *b)
{
    return (X509_NAME_cmp(*a, *b));
}
 
MSG_PROCESS_RETURN tls_process_new_session_ticket(SSL *s, PACKET *pkt)
{
    int al;
    unsigned int ticklen;
    unsigned long ticket_lifetime_hint;
 
    if (!PACKET_get_net_4(pkt, &ticket_lifetime_hint)
        || !PACKET_get_net_2(pkt, &ticklen)
        || PACKET_remaining(pkt) != ticklen) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
 
    /* Server is allowed to change its mind and send an empty ticket. */
    if (ticklen == 0)
        return MSG_PROCESS_CONTINUE_READING;
 
    if (s->session->session_id_length > 0) {
        int i = s->session_ctx->session_cache_mode;
        SSL_SESSION *new_sess;
        /*
         * We reused an existing session, so we need to replace it with a new
         * one
         */
        if (i & SSL_SESS_CACHE_CLIENT) {
            /*
             * Remove the old session from the cache. We carry on if this fails
             */
            SSL_CTX_remove_session(s->session_ctx, s->session);
        }
 
        if ((new_sess = ssl_session_dup(s->session, 0)) == 0) {
            al = SSL_AD_INTERNAL_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
            goto f_err;
        }
 
        SSL_SESSION_free(s->session);
        s->session = new_sess;
    }
 
    OPENSSL_free(s->session->tlsext_tick);
    s->session->tlsext_ticklen = 0;
 
    s->session->tlsext_tick = OPENSSL_malloc(ticklen);
    if (s->session->tlsext_tick == NULL) {
        SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
        goto err;
    }
    if (!PACKET_copy_bytes(pkt, s->session->tlsext_tick, ticklen)) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
 
    s->session->tlsext_tick_lifetime_hint = ticket_lifetime_hint;
    s->session->tlsext_ticklen = ticklen;
    /*
     * There are two ways to detect a resumed ticket session. One is to set
     * an appropriate session ID and then the server must return a match in
     * ServerHello. This allows the normal client session ID matching to work
     * and we know much earlier that the ticket has been accepted. The
     * other way is to set zero length session ID when the ticket is
     * presented and rely on the handshake to determine session resumption.
     * We choose the former approach because this fits in with assumptions
     * elsewhere in OpenSSL. The session ID is set to the SHA256 (or SHA1 is
     * SHA256 is disabled) hash of the ticket.
     */
    if (!EVP_Digest(s->session->tlsext_tick, ticklen,
                    s->session->session_id, &s->session->session_id_length,
                    EVP_get_digestbynid(NID_sha256), NULL)) {
        SSLerr(SSL_F_TLS_PROCESS_NEW_SESSION_TICKET, ERR_R_EVP_LIB);
        goto err;
    }
    return MSG_PROCESS_CONTINUE_READING;
 f_err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
 err:
    ossl_statem_set_error(s);
    return MSG_PROCESS_ERROR;
}
 
MSG_PROCESS_RETURN tls_process_cert_status(SSL *s, PACKET *pkt)
{
    int al;
    unsigned long resplen;
    unsigned int type;
 
    if (!PACKET_get_1(pkt, &type)
        || type != TLSEXT_STATUSTYPE_ocsp) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CERT_STATUS, SSL_R_UNSUPPORTED_STATUS_TYPE);
        goto f_err;
    }
    if (!PACKET_get_net_3(pkt, &resplen)
        || PACKET_remaining(pkt) != resplen) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
    s->tlsext_ocsp_resp = OPENSSL_malloc(resplen);
    if (s->tlsext_ocsp_resp == NULL) {
        al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CERT_STATUS, ERR_R_MALLOC_FAILURE);
        goto f_err;
    }
    if (!PACKET_copy_bytes(pkt, s->tlsext_ocsp_resp, resplen)) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CERT_STATUS, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
    s->tlsext_ocsp_resplen = resplen;
    return MSG_PROCESS_CONTINUE_READING;
 f_err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
    ossl_statem_set_error(s);
    return MSG_PROCESS_ERROR;
}
 
MSG_PROCESS_RETURN tls_process_server_done(SSL *s, PACKET *pkt)
{
    if (PACKET_remaining(pkt) > 0) {
        /* should contain no data */
        ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_DECODE_ERROR);
        SSLerr(SSL_F_TLS_PROCESS_SERVER_DONE, SSL_R_LENGTH_MISMATCH);
        ossl_statem_set_error(s);
        return MSG_PROCESS_ERROR;
    }
#ifndef OPENSSL_NO_SRP
    if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
        if (SRP_Calc_A_param(s) <= 0) {
            SSLerr(SSL_F_TLS_PROCESS_SERVER_DONE, SSL_R_SRP_A_CALC);
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
            ossl_statem_set_error(s);
            return MSG_PROCESS_ERROR;
        }
    }
#endif
 
    /*
     * at this point we check that we have the required stuff from
     * the server
     */
    if (!ssl3_check_cert_and_algorithm(s)) {
        ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
        ossl_statem_set_error(s);
        return MSG_PROCESS_ERROR;
    }
 
    /*
     * Call the ocsp status callback if needed. The |tlsext_ocsp_resp| and
     * |tlsext_ocsp_resplen| values will be set if we actually received a status
     * message, or NULL and -1 otherwise
     */
    if (s->tlsext_status_type != -1 && s->ctx->tlsext_status_cb != NULL) {
        int ret;
        ret = s->ctx->tlsext_status_cb(s, s->ctx->tlsext_status_arg);
        if (ret == 0) {
            ssl3_send_alert(s, SSL3_AL_FATAL,
                            SSL_AD_BAD_CERTIFICATE_STATUS_RESPONSE);
            SSLerr(SSL_F_TLS_PROCESS_SERVER_DONE,
                   SSL_R_INVALID_STATUS_RESPONSE);
            return MSG_PROCESS_ERROR;
        }
        if (ret < 0) {
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
            SSLerr(SSL_F_TLS_PROCESS_SERVER_DONE, ERR_R_MALLOC_FAILURE);
            return MSG_PROCESS_ERROR;
        }
    }
#ifndef OPENSSL_NO_CT
    if (s->ct_validation_callback != NULL) {
        /* Note we validate the SCTs whether or not we abort on error */
        if (!ssl_validate_ct(s) && (s->verify_mode & SSL_VERIFY_PEER)) {
            ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
            return MSG_PROCESS_ERROR;
        }
    }
#endif
 
#ifndef OPENSSL_NO_SCTP
    /* Only applies to renegotiation */
    if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s))
        && s->renegotiate != 0)
        return MSG_PROCESS_CONTINUE_PROCESSING;
    else
#endif
        return MSG_PROCESS_FINISHED_READING;
}
 
static int tls_construct_cke_psk_preamble(SSL *s, unsigned char **p,
                                          size_t *pskhdrlen, int *al)
{
#ifndef OPENSSL_NO_PSK
    int ret = 0;
    /*
     * The callback needs PSK_MAX_IDENTITY_LEN + 1 bytes to return a
     * \0-terminated identity. The last byte is for us for simulating
     * strnlen.
     */
    char identity[PSK_MAX_IDENTITY_LEN + 1];
    size_t identitylen = 0;
    unsigned char psk[PSK_MAX_PSK_LEN];
    unsigned char *tmppsk = NULL;
    char *tmpidentity = NULL;
    size_t psklen = 0;
 
    if (s->psk_client_callback == NULL) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, SSL_R_PSK_NO_CLIENT_CB);
        *al = SSL_AD_INTERNAL_ERROR;
        goto err;
    }
 
    memset(identity, 0, sizeof(identity));
 
    psklen = s->psk_client_callback(s, s->session->psk_identity_hint,
                                    identity, sizeof(identity) - 1,
                                    psk, sizeof(psk));
 
    if (psklen > PSK_MAX_PSK_LEN) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
        *al = SSL_AD_HANDSHAKE_FAILURE;
        goto err;
    } else if (psklen == 0) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE,
               SSL_R_PSK_IDENTITY_NOT_FOUND);
        *al = SSL_AD_HANDSHAKE_FAILURE;
        goto err;
    }
 
    identitylen = strlen(identity);
    if (identitylen > PSK_MAX_IDENTITY_LEN) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
        *al = SSL_AD_HANDSHAKE_FAILURE;
        goto err;
    }
 
    tmppsk = OPENSSL_memdup(psk, psklen);
    tmpidentity = OPENSSL_strdup(identity);
    if (tmppsk == NULL || tmpidentity == NULL) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_MALLOC_FAILURE);
        *al = SSL_AD_INTERNAL_ERROR;
        goto err;
    }
 
    OPENSSL_free(s->s3->tmp.psk);
    s->s3->tmp.psk = tmppsk;
    s->s3->tmp.psklen = psklen;
    tmppsk = NULL;
    OPENSSL_free(s->session->psk_identity);
    s->session->psk_identity = tmpidentity;
    tmpidentity = NULL;
    s2n(identitylen, *p);
    memcpy(*p, identity, identitylen);
    *pskhdrlen = 2 + identitylen;
    *p += identitylen;
 
    ret = 1;
 
 err:
    OPENSSL_cleanse(psk, psklen);
    OPENSSL_cleanse(identity, sizeof(identity));
    OPENSSL_clear_free(tmppsk, psklen);
    OPENSSL_clear_free(tmpidentity, identitylen);
 
    return ret;
#else
    SSLerr(SSL_F_TLS_CONSTRUCT_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
    *al = SSL_AD_INTERNAL_ERROR;
    return 0;
#endif
}
 
static int tls_construct_cke_rsa(SSL *s, unsigned char **p, int *len, int *al)
{
#ifndef OPENSSL_NO_RSA
    unsigned char *q;
    EVP_PKEY *pkey = NULL;
    EVP_PKEY_CTX *pctx = NULL;
    size_t enclen;
    unsigned char *pms = NULL;
    size_t pmslen = 0;
 
    if (s->session->peer == NULL) {
        /*
         * We should always have a server certificate with SSL_kRSA.
         */
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_INTERNAL_ERROR);
        return 0;
    }
 
    pkey = X509_get0_pubkey(s->session->peer);
    if (EVP_PKEY_get0_RSA(pkey) == NULL) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_INTERNAL_ERROR);
        return 0;
    }
 
    pmslen = SSL_MAX_MASTER_KEY_LENGTH;
    pms = OPENSSL_malloc(pmslen);
    if (pms == NULL) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_MALLOC_FAILURE);
        *al = SSL_AD_INTERNAL_ERROR;
        return 0;
    }
 
    pms[0] = s->client_version >> 8;
    pms[1] = s->client_version & 0xff;
    if (RAND_bytes(pms + 2, pmslen - 2) <= 0) {
        goto err;
    }
 
    q = *p;
    /* Fix buf for TLS, GMTLS and beyond */
    if (s->version > SSL3_VERSION || SSL_IS_GMTLS(s))
        *p += 2;
    pctx = EVP_PKEY_CTX_new(pkey, NULL);
    if (pctx == NULL || EVP_PKEY_encrypt_init(pctx) <= 0
        || EVP_PKEY_encrypt(pctx, NULL, &enclen, pms, pmslen) <= 0) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_EVP_LIB);
        goto err;
    }
    if (EVP_PKEY_encrypt(pctx, *p, &enclen, pms, pmslen) <= 0) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, SSL_R_BAD_RSA_ENCRYPT);
        goto err;
    }
    *len = enclen;
    EVP_PKEY_CTX_free(pctx);
    pctx = NULL;
# ifdef PKCS1_CHECK
    if (s->options & SSL_OP_PKCS1_CHECK_1)
        (*p)[1]++;
    if (s->options & SSL_OP_PKCS1_CHECK_2)
        tmp_buf[0] = 0x70;
# endif
 
    /* Fix buf for TLS and beyond */
    if (s->version > SSL3_VERSION || SSL_IS_GMTLS(s)) {
        s2n(*len, q);
        *len += 2;
    }
 
    s->s3->tmp.pms = pms;
    s->s3->tmp.pmslen = pmslen;
 
    return 1;
 err:
    OPENSSL_clear_free(pms, pmslen);
    EVP_PKEY_CTX_free(pctx);
 
    return 0;
#else
    SSLerr(SSL_F_TLS_CONSTRUCT_CKE_RSA, ERR_R_INTERNAL_ERROR);
    *al = SSL_AD_INTERNAL_ERROR;
    return 0;
#endif
}
 
 
 
static int tls_construct_cke_dhe(SSL *s, unsigned char **p, int *len, int *al)
{
#ifndef OPENSSL_NO_DH
    DH *dh_clnt = NULL;
    const BIGNUM *pub_key;
    EVP_PKEY *ckey = NULL, *skey = NULL;
 
    skey = s->s3->peer_tmp;
    if (skey == NULL) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_DHE, ERR_R_INTERNAL_ERROR);
        return 0;
    }
    ckey = ssl_generate_pkey(skey);
    if (ckey == NULL) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_DHE, ERR_R_INTERNAL_ERROR);
        return 0;
    }
 
    dh_clnt = EVP_PKEY_get0_DH(ckey);
 
    if (dh_clnt == NULL || ssl_derive(s, ckey, skey) == 0) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_DHE, ERR_R_INTERNAL_ERROR);
        EVP_PKEY_free(ckey);
        return 0;
    }
 
    /* send off the data */
    DH_get0_key(dh_clnt, &pub_key, NULL);
    *len = BN_num_bytes(pub_key);
    s2n(*len, *p);
    BN_bn2bin(pub_key, *p);
    *len += 2;
    EVP_PKEY_free(ckey);
 
    return 1;
#else
    SSLerr(SSL_F_TLS_CONSTRUCT_CKE_DHE, ERR_R_INTERNAL_ERROR);
    *al = SSL_AD_INTERNAL_ERROR;
    return 0;
#endif
}
 
static int tls_construct_cke_ecdhe(SSL *s, unsigned char **p, int *len, int *al)
{
#ifndef OPENSSL_NO_EC
    unsigned char *encodedPoint = NULL;
    int encoded_pt_len = 0;
    EVP_PKEY *ckey = NULL, *skey = NULL;
 
    skey = s->s3->peer_tmp;
    if (skey == NULL) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
        return 0;
    }
 
    ckey = ssl_generate_pkey(skey);
    if (ckey == NULL) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
        goto err;
    }
 
    if (ssl_derive(s, ckey, skey) == 0) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_EVP_LIB);
        goto err;
    }
 
    /* Generate encoding of client key */
    encoded_pt_len = EVP_PKEY_get1_tls_encodedpoint(ckey, &encodedPoint);
 
    if (encoded_pt_len == 0) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_EC_LIB);
        goto err;
    }
 
    EVP_PKEY_free(ckey);
    ckey = NULL;
 
    *len = encoded_pt_len;
 
    /* length of encoded point */
    **p = *len;
    *p += 1;
    /* copy the point */
    memcpy(*p, encodedPoint, *len);
    /* increment len to account for length field */
    *len += 1;
 
    OPENSSL_free(encodedPoint);
 
    return 1;
 err:
    EVP_PKEY_free(ckey);
    return 0;
#else
    SSLerr(SSL_F_TLS_CONSTRUCT_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
    *al = SSL_AD_INTERNAL_ERROR;
    return 0;
#endif
}
 
static int tls_construct_cke_gost(SSL *s, unsigned char **p, int *len, int *al)
{
#ifndef OPENSSL_NO_GOST
    /* GOST key exchange message creation */
    EVP_PKEY_CTX *pkey_ctx = NULL;
    X509 *peer_cert;
    size_t msglen;
    unsigned int md_len;
    unsigned char shared_ukm[32], tmp[256];
    EVP_MD_CTX *ukm_hash = NULL;
    int dgst_nid = NID_id_GostR3411_94;
    unsigned char *pms = NULL;
    size_t pmslen = 0;
 
    if ((s->s3->tmp.new_cipher->algorithm_auth & SSL_aGOST12) != 0)
        dgst_nid = NID_id_GostR3411_2012_256;
 
    /*
     * Get server sertificate PKEY and create ctx from it
     */
    peer_cert = s->session->peer;
    if (!peer_cert) {
        *al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST,
               SSL_R_NO_GOST_CERTIFICATE_SENT_BY_PEER);
        return 0;
    }
 
    pkey_ctx = EVP_PKEY_CTX_new(X509_get0_pubkey(peer_cert), NULL);
    if (pkey_ctx == NULL) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_MALLOC_FAILURE);
        return 0;
    }
    /*
     * If we have send a certificate, and certificate key
     * parameters match those of server certificate, use
     * certificate key for key exchange
     */
 
    /* Otherwise, generate ephemeral key pair */
    pmslen = 32;
    pms = OPENSSL_malloc(pmslen);
    if (pms == NULL) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_MALLOC_FAILURE);
        goto err;
    }
 
    if (EVP_PKEY_encrypt_init(pkey_ctx) <= 0
        /* Generate session key */
        || RAND_bytes(pms, pmslen) <= 0) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_INTERNAL_ERROR);
        goto err;
    };
    /*
     * Compute shared IV and store it in algorithm-specific context
     * data
     */
    ukm_hash = EVP_MD_CTX_new();
    if (ukm_hash == NULL
        || EVP_DigestInit(ukm_hash, EVP_get_digestbynid(dgst_nid)) <= 0
        || EVP_DigestUpdate(ukm_hash, s->s3->client_random,
                            SSL3_RANDOM_SIZE) <= 0
        || EVP_DigestUpdate(ukm_hash, s->s3->server_random,
                            SSL3_RANDOM_SIZE) <= 0
        || EVP_DigestFinal_ex(ukm_hash, shared_ukm, &md_len) <= 0) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_INTERNAL_ERROR);
        goto err;
    }
    EVP_MD_CTX_free(ukm_hash);
    ukm_hash = NULL;
    if (EVP_PKEY_CTX_ctrl(pkey_ctx, -1, EVP_PKEY_OP_ENCRYPT,
                          EVP_PKEY_CTRL_SET_IV, 8, shared_ukm) < 0) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, SSL_R_LIBRARY_BUG);
        goto err;
    }
    /* Make GOST keytransport blob message */
    /*
     * Encapsulate it into sequence
     */
    *((*p)++) = V_ASN1_SEQUENCE | V_ASN1_CONSTRUCTED;
    msglen = 255;
    if (EVP_PKEY_encrypt(pkey_ctx, tmp, &msglen, pms, pmslen) <= 0) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, SSL_R_LIBRARY_BUG);
        goto err;
    }
    if (msglen >= 0x80) {
        *((*p)++) = 0x81;
        *((*p)++) = msglen & 0xff;
        *len = msglen + 3;
    } else {
        *((*p)++) = msglen & 0xff;
        *len = msglen + 2;
    }
    memcpy(*p, tmp, msglen);
 
    EVP_PKEY_CTX_free(pkey_ctx);
    s->s3->tmp.pms = pms;
    s->s3->tmp.pmslen = pmslen;
 
    return 1;
 err:
    EVP_PKEY_CTX_free(pkey_ctx);
    OPENSSL_clear_free(pms, pmslen);
    EVP_MD_CTX_free(ukm_hash);
    return 0;
#else
    SSLerr(SSL_F_TLS_CONSTRUCT_CKE_GOST, ERR_R_INTERNAL_ERROR);
    *al = SSL_AD_INTERNAL_ERROR;
    return 0;
#endif
}
 
static int tls_construct_cke_srp(SSL *s, unsigned char **p, int *len, int *al)
{
#ifndef OPENSSL_NO_SRP
    if (s->srp_ctx.A != NULL) {
        /* send off the data */
        *len = BN_num_bytes(s->srp_ctx.A);
        s2n(*len, *p);
        BN_bn2bin(s->srp_ctx.A, *p);
        *len += 2;
    } else {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_SRP, ERR_R_INTERNAL_ERROR);
        return 0;
    }
    OPENSSL_free(s->session->srp_username);
    s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login);
    if (s->session->srp_username == NULL) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CKE_SRP, ERR_R_MALLOC_FAILURE);
        return 0;
    }
 
    return 1;
#else
    SSLerr(SSL_F_TLS_CONSTRUCT_CKE_SRP, ERR_R_INTERNAL_ERROR);
    *al = SSL_AD_INTERNAL_ERROR;
    return 0;
#endif
}
 
int tls_construct_client_key_exchange(SSL *s)
{
    unsigned char *p;
    int len;
    size_t pskhdrlen = 0;
    unsigned long alg_k;
    int al = -1;
 
    alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 
    p = ssl_handshake_start(s);
 
    if ((alg_k & SSL_PSK)
        && !tls_construct_cke_psk_preamble(s, &p, &pskhdrlen, &al))
        goto err;
 
    if (alg_k & SSL_kPSK) {
        len = 0;
    } else if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
        if (!tls_construct_cke_rsa(s, &p, &len, &al))
            goto err;
    } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
        if (!tls_construct_cke_dhe(s, &p, &len, &al))
            goto err;
    } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK | SSL_kSM2DHE |
                        SSL_kSM2PSK)) {
        if (!tls_construct_cke_ecdhe(s, &p, &len, &al))
            goto err;
    } else if (alg_k & SSL_kGOST) {
        if (!tls_construct_cke_gost(s, &p, &len, &al))
            goto err;
    } else if (alg_k & SSL_kSRP) {
        if (!tls_construct_cke_srp(s, &p, &len, &al))
            goto err;
    } else {
        ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
        SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
        goto err;
    }
 
    len += pskhdrlen;
 
    if (!ssl_set_handshake_header(s, SSL3_MT_CLIENT_KEY_EXCHANGE, len)) {
        ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_HANDSHAKE_FAILURE);
        SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
        goto err;
    }
 
    return 1;
 err:
    if (al != -1)
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
    OPENSSL_clear_free(s->s3->tmp.pms, s->s3->tmp.pmslen);
    s->s3->tmp.pms = NULL;
#ifndef OPENSSL_NO_PSK
    OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen);
    s->s3->tmp.psk = NULL;
#endif
    ossl_statem_set_error(s);
    return 0;
}
 
int tls_client_key_exchange_post_work(SSL *s)
{
    unsigned char *pms = NULL;
    size_t pmslen = 0;
 
    pms = s->s3->tmp.pms;
    pmslen = s->s3->tmp.pmslen;
 
#ifndef OPENSSL_NO_SRP
    /* Check for SRP */
    if (s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) {
        if (!srp_generate_client_master_secret(s)) {
            SSLerr(SSL_F_TLS_CLIENT_KEY_EXCHANGE_POST_WORK,
                   ERR_R_INTERNAL_ERROR);
            goto err;
        }
        return 1;
    }
#endif
 
    if (pms == NULL && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_kPSK)) {
        ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
        SSLerr(SSL_F_TLS_CLIENT_KEY_EXCHANGE_POST_WORK, ERR_R_MALLOC_FAILURE);
        goto err;
    }
    if (!ssl_generate_master_secret(s, pms, pmslen, 1)) {
        ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
        SSLerr(SSL_F_TLS_CLIENT_KEY_EXCHANGE_POST_WORK, ERR_R_INTERNAL_ERROR);
        /* ssl_generate_master_secret frees the pms even on error */
        pms = NULL;
        pmslen = 0;
        goto err;
    }
    pms = NULL;
    pmslen = 0;
 
#ifndef OPENSSL_NO_SCTP
    if (SSL_IS_DTLS(s)) {
        unsigned char sctpauthkey[64];
        char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
 
        /*
         * Add new shared key for SCTP-Auth, will be ignored if no SCTP
         * used.
         */
        memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
               sizeof(DTLS1_SCTP_AUTH_LABEL));
 
        if (SSL_export_keying_material(s, sctpauthkey,
                                       sizeof(sctpauthkey), labelbuffer,
                                       sizeof(labelbuffer), NULL, 0, 0) <= 0)
            goto err;
 
        BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
                 sizeof(sctpauthkey), sctpauthkey);
    }
#endif
 
    return 1;
 err:
    OPENSSL_clear_free(pms, pmslen);
    s->s3->tmp.pms = NULL;
    return 0;
}
 
int tls_construct_client_verify(SSL *s)
{
    unsigned char *p;
    EVP_PKEY *pkey;
    const EVP_MD *md = s->s3->tmp.md[s->cert->key - s->cert->pkeys];
    EVP_MD_CTX *mctx;
    unsigned u = 0;
    unsigned long n = 0;
    long hdatalen = 0;
    void *hdata;
 
	int ret;
	unsigned char out[81920];
 
    mctx = EVP_MD_CTX_new();
    if (mctx == NULL) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_MALLOC_FAILURE);
        goto err;
    }
 
    p = ssl_handshake_start(s);
// modify begin 使用gmtls 生成 certificate verify 消息，应该使用签名证书私钥 
#ifndef OPENSSL_NO_GMTLS
    if (SSL_IS_GMTLS(s) && s->cert->pkeys[SSL_PKEY_SM2].privatekey)
        pkey = s->cert->pkeys[SSL_PKEY_SM2].privatekey;
    else
#endif
    pkey = s->cert->key->privatekey;
// modify end
 
    hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
    if (hdatalen <= 0) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
        goto err;
    }
 
	memcpy(out, (unsigned char *)hdata, hdatalen);
	out[hdatalen] = 0;
	ret = hdatalen;
 
// modify begin 使用gmtls 对从 client hello 消息到 client CertificateVerify 消息（不包括client CertificateVerify消息）所有内容做SM3摘要计算
#ifndef OPENSSL_NO_SM2
    	EVP_MD_CTX *mctx1 = NULL;
        if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSM2) 
	{
		// from client hello to client CertificateVerify(not include CertificateVerify) make sm3
		mctx1 = EVP_MD_CTX_new();
		if (mctx1 == NULL) {
			SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_MALLOC_FAILURE);
			goto err;
		}
		EVP_MD_CTX_init(mctx1);
		if (!EVP_DigestInit(mctx1, md)
		|| EVP_DigestUpdate(mctx1, (unsigned char *)hdata,
			hdatalen) <= 0
		|| EVP_DigestFinal_ex(mctx1, out, &ret) <= 0)
		{
			SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
			goto err;
		}
		out[ret] = 0;
	}
	if (mctx1 != NULL)
		EVP_MD_CTX_free(mctx1);
#endif
// modify end
 
    if (SSL_USE_SIGALGS(s)) {
        if (!tls12_get_sigandhash(p, pkey, md)) {
            SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
            goto err;
        }
        p += 2;
        n = 2;
    }
#ifdef SSL_DEBUG
    fprintf(stderr, "Using client alg %s\n", EVP_MD_name(md));
#endif
 
// modify begin 使用gmtls 从上面得到的SM3摘要结果，还需要使用 SM2_DEFAULT_ID（1234567812345678） 做内部哈希，再签名
	if (!EVP_SignInit_ex(mctx, md, NULL))
	{
		SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_EVP_LIB);
		goto err;
	}
 
#ifndef OPENSSL_NO_SM2
	if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSM2)
	{
		// SM2_DEFAULT_ID to assign, when compute CertificateVerify sign
		unsigned char z[EVP_MAX_MD_SIZE];
		size_t zlen;
		char *id = NULL;
		id = SM2_DEFAULT_ID;
		zlen = sizeof(z);
		if (!SM2_compute_id_digest(EVP_sm3(), id, strlen(id), z, &zlen,
			EVP_PKEY_get0_EC_KEY(pkey))) {
			SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_SM2_LIB);
			goto err;
		}
 
		if (!EVP_SignUpdate(mctx, z, zlen))
		{
			SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_EVP_LIB);
			goto err;
		}
	}
#endif
	//if (!EVP_SignUpdate(mctx, hdata, hdatalen) || (s->version == SSL3_VERSION && !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET,s->session->master_key_length,s->session->master_key)) || !EVP_SignFinal(mctx, p + 2, &u, pkey))
	if (!EVP_SignUpdate(mctx, out, ret) || (s->version == SSL3_VERSION && !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET,s->session->master_key_length,s->session->master_key)) || !EVP_SignFinal(mctx, p + 2, &u, pkey))
	{
		SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_EVP_LIB);
		goto err;
	}
// modify end
		
 
#ifndef OPENSSL_NO_GOST
    {
        int pktype = EVP_PKEY_id(pkey);
        if (pktype == NID_id_GostR3410_2001
            || pktype == NID_id_GostR3410_2012_256
            || pktype == NID_id_GostR3410_2012_512)
            BUF_reverse(p + 2, NULL, u);
    }
#endif
 
    s2n(u, p);
    n += u + 2;
    /* Digest cached records and discard handshake buffer */
    if (!ssl3_digest_cached_records(s, 0))
        goto err;
    if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_VERIFY, n)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
        goto err;
    }
 
    EVP_MD_CTX_free(mctx);
    return 1;
 err:
    EVP_MD_CTX_free(mctx);
    return 0;
}
 
/*
 * Check a certificate can be used for client authentication. Currently check
 * cert exists, if we have a suitable digest for TLS 1.2 if static DH client
 * certificates can be used and optionally checks suitability for Suite B.
 */
static int ssl3_check_client_certificate(SSL *s)
{
    if (!s->cert || !s->cert->key->x509 || !s->cert->key->privatekey)
        return 0;
    /* If no suitable signature algorithm can't use certificate */
    if (SSL_USE_SIGALGS(s) && !s->s3->tmp.md[s->cert->key - s->cert->pkeys])
        return 0;
    /*
     * If strict mode check suitability of chain before using it. This also
     * adjusts suite B digest if necessary.
     */
    if (s->cert->cert_flags & SSL_CERT_FLAGS_CHECK_TLS_STRICT &&
        !tls1_check_chain(s, NULL, NULL, NULL, -2))
        return 0;
    return 1;
}
 
WORK_STATE tls_prepare_client_certificate(SSL *s, WORK_STATE wst)
{
    X509 *x509 = NULL;
    EVP_PKEY *pkey = NULL;
    int i;
 
    if (wst == WORK_MORE_A) {
        /* Let cert callback update client certificates if required */
        if (s->cert->cert_cb) {
            i = s->cert->cert_cb(s, s->cert->cert_cb_arg);
            if (i < 0) {
                s->rwstate = SSL_X509_LOOKUP;
                return WORK_MORE_A;
            }
            if (i == 0) {
                ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
                ossl_statem_set_error(s);
                return 0;
            }
            s->rwstate = SSL_NOTHING;
        }
        if (ssl3_check_client_certificate(s))
            return WORK_FINISHED_CONTINUE;
 
        /* Fall through to WORK_MORE_B */
        wst = WORK_MORE_B;
    }
 
    /* We need to get a client cert */
    if (wst == WORK_MORE_B) {
        /*
         * If we get an error, we need to ssl->rwstate=SSL_X509_LOOKUP;
         * return(-1); We then get retied later
         */
        i = ssl_do_client_cert_cb(s, &x509, &pkey);
        if (i < 0) {
            s->rwstate = SSL_X509_LOOKUP;
            return WORK_MORE_B;
        }
        s->rwstate = SSL_NOTHING;
        if ((i == 1) && (pkey != NULL) && (x509 != NULL)) {
            if (!SSL_use_certificate(s, x509) || !SSL_use_PrivateKey(s, pkey))
                i = 0;
        } else if (i == 1) {
            i = 0;
            SSLerr(SSL_F_TLS_PREPARE_CLIENT_CERTIFICATE,
                   SSL_R_BAD_DATA_RETURNED_BY_CALLBACK);
        }
 
        X509_free(x509);
        EVP_PKEY_free(pkey);
        if (i && !ssl3_check_client_certificate(s))
            i = 0;
        if (i == 0) {
            if (s->version == SSL3_VERSION) {
                s->s3->tmp.cert_req = 0;
                ssl3_send_alert(s, SSL3_AL_WARNING, SSL_AD_NO_CERTIFICATE);
                return WORK_FINISHED_CONTINUE;
            } else {
                s->s3->tmp.cert_req = 2;
                if (!ssl3_digest_cached_records(s, 0)) {
                    ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
                    ossl_statem_set_error(s);
                    return 0;
                }
            }
        }
 
        return WORK_FINISHED_CONTINUE;
    }
 
    /* Shouldn't ever get here */
    return WORK_ERROR;
}
 
int tls_construct_client_certificate(SSL *s)
{
    if (!ssl3_output_cert_chain(s,
                                (s->s3->tmp.cert_req ==
                                 2) ? NULL : s->cert->key)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_CERTIFICATE, ERR_R_INTERNAL_ERROR);
        ssl3_send_alert(s, SSL3_AL_FATAL, SSL_AD_INTERNAL_ERROR);
        ossl_statem_set_error(s);
        return 0;
    }
 
    return 1;
}
 
#define has_bits(i,m)   (((i)&(m)) == (m))
 
int ssl3_check_cert_and_algorithm(SSL *s)
{
    int i;
#ifndef OPENSSL_NO_EC
    int idx;
#endif
    long alg_k, alg_a;
    EVP_PKEY *pkey = NULL;
    int al = SSL_AD_HANDSHAKE_FAILURE;
 
    alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
    alg_a = s->s3->tmp.new_cipher->algorithm_auth;
 
    /* we don't have a certificate */
    if ((alg_a & SSL_aNULL) || (alg_k & SSL_kPSK))
        return (1);
 
    /* This is the passed certificate */
 
#ifndef OPENSSL_NO_EC
    idx = s->session->peer_type;
    if ((idx == SSL_PKEY_ECC) || (idx == SSL_PKEY_SM2)) { /* GMTLS */
        if (ssl_check_srvr_ecc_cert_and_alg(s->session->peer, s) == 0) {
            /* check failed */
            SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, SSL_R_BAD_ECC_CERT);
            goto f_err;
        } else {
            return 1;
        }
    } else if ((alg_a & SSL_aECDSA) || (alg_a & SSL_aSM2)) { /* GMTLS */
        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
               SSL_R_MISSING_ECDSA_SIGNING_CERT);
        goto f_err;
    }
#endif
    pkey = X509_get0_pubkey(s->session->peer);
    i = X509_certificate_type(s->session->peer, pkey);
 
    /* Check that we have a certificate if we require one */
    if ((alg_a & SSL_aRSA) && !has_bits(i, EVP_PK_RSA | EVP_PKT_SIGN)) {
        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
               SSL_R_MISSING_RSA_SIGNING_CERT);
        goto f_err;
    }
#ifndef OPENSSL_NO_DSA
    else if ((alg_a & SSL_aDSS) && !has_bits(i, EVP_PK_DSA | EVP_PKT_SIGN)) {
        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
               SSL_R_MISSING_DSA_SIGNING_CERT);
        goto f_err;
    }
#endif
#ifndef OPENSSL_NO_RSA
    if (alg_k & (SSL_kRSA | SSL_kRSAPSK) &&
        !has_bits(i, EVP_PK_RSA | EVP_PKT_ENC)) {
        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM,
               SSL_R_MISSING_RSA_ENCRYPTING_CERT);
        goto f_err;
    }
#endif
#ifndef OPENSSL_NO_DH
    if ((alg_k & SSL_kDHE) && (s->s3->peer_tmp == NULL)) {
        al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_SSL3_CHECK_CERT_AND_ALGORITHM, ERR_R_INTERNAL_ERROR);
        goto f_err;
    }
#endif
 
    return (1);
 f_err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
    return (0);
}
 
#ifndef OPENSSL_NO_NEXTPROTONEG
int tls_construct_next_proto(SSL *s)
{
    unsigned int len, padding_len;
    unsigned char *d;
 
    len = s->next_proto_negotiated_len;
    padding_len = 32 - ((len + 2) % 32);
    d = (unsigned char *)s->init_buf->data;
    d[4] = len;
    memcpy(d + 5, s->next_proto_negotiated, len);
    d[5 + len] = padding_len;
    memset(d + 6 + len, 0, padding_len);
    *(d++) = SSL3_MT_NEXT_PROTO;
    l2n3(2 + len + padding_len, d);
    s->init_num = 4 + 2 + len + padding_len;
    s->init_off = 0;
 
    return 1;
}
#endif
 
int ssl_do_client_cert_cb(SSL *s, X509 **px509, EVP_PKEY **ppkey)
{
    int i = 0;
#ifndef OPENSSL_NO_ENGINE
    if (s->ctx->client_cert_engine) {
        i = ENGINE_load_ssl_client_cert(s->ctx->client_cert_engine, s,
                                        SSL_get_client_CA_list(s),
                                        px509, ppkey, NULL, NULL, NULL);
        if (i != 0)
            return i;
    }
#endif
    if (s->ctx->client_cert_cb)
        i = s->ctx->client_cert_cb(s, px509, ppkey);
    return i;
}
 
int ssl_cipher_list_to_bytes(SSL *s, STACK_OF(SSL_CIPHER) *sk, unsigned char *p)
{
    int i, j = 0;
    const SSL_CIPHER *c;
    unsigned char *q;
    int empty_reneg_info_scsv = !s->renegotiate;
    /* Set disabled masks for this session */
    ssl_set_client_disabled(s);
 
    if (sk == NULL)
        return (0);
    q = p;
 
    for (i = 0; i < sk_SSL_CIPHER_num(sk); i++) {
        c = sk_SSL_CIPHER_value(sk, i);
        /* Skip disabled ciphers */
        if (ssl_cipher_disabled(s, c, SSL_SECOP_CIPHER_SUPPORTED))
            continue;
        j = s->method->put_cipher_by_char(c, p);
        p += j;
    }
    /*
     * If p == q, no ciphers; caller indicates an error. Otherwise, add
     * applicable SCSVs.
     */
    if (p != q) {
        if (empty_reneg_info_scsv) {
            static SSL_CIPHER scsv = {
                0, NULL, SSL3_CK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
            };
            j = s->method->put_cipher_by_char(&scsv, p);
            p += j;
        }
        if (s->mode & SSL_MODE_SEND_FALLBACK_SCSV) {
            static SSL_CIPHER scsv = {
                0, NULL, SSL3_CK_FALLBACK_SCSV, 0, 0, 0, 0, 0, 0, 0, 0, 0
            };
            j = s->method->put_cipher_by_char(&scsv, p);
            p += j;
        }
    }
 
    return (p - q);
}

statem_srvr

/* ====================================================================
 * Copyright (c) 2014 - 2017 The GmSSL Project.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. All advertising materials mentioning features or use of this
 *    software must display the following acknowledgment:
 *    "This product includes software developed by the GmSSL Project.
 *    (http://gmssl.org/)"
 *
 * 4. The name "GmSSL Project" must not be used to endorse or promote
 *    products derived from this software without prior written
 *    permission. For written permission, please contact
 *    guanzhi1980@gmail.com.
 *
 * 5. Products derived from this software may not be called "GmSSL"
 *    nor may "GmSSL" appear in their names without prior written
 *    permission of the GmSSL Project.
 *
 * 6. Redistributions of any form whatsoever must retain the following
 *    acknowledgment:
 *    "This product includes software developed by the GmSSL Project
 *    (http://gmssl.org/)"
 *
 * THIS SOFTWARE IS PROVIDED BY THE GmSSL PROJECT ``AS IS'' AND ANY
 * EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE GmSSL PROJECT OR
 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 */
/*
 * Copyright 1995-2016 The OpenSSL Project Authors. All Rights Reserved.
 *
 * Licensed under the OpenSSL license (the "License").  You may not use
 * this file except in compliance with the License.  You can obtain a copy
 * in the file LICENSE in the source distribution or at
 * https://www.openssl.org/source/license.html
 */
 
/* ====================================================================
 * Copyright 2002 Sun Microsystems, Inc. ALL RIGHTS RESERVED.
 *
 * Portions of the attached software ("Contribution") are developed by
 * SUN MICROSYSTEMS, INC., and are contributed to the OpenSSL project.
 *
 * The Contribution is licensed pursuant to the OpenSSL open source
 * license provided above.
 *
 * ECC cipher suite support in OpenSSL originally written by
 * Vipul Gupta and Sumit Gupta of Sun Microsystems Laboratories.
 *
 */
/* ====================================================================
 * Copyright 2005 Nokia. All rights reserved.
 *
 * The portions of the attached software ("Contribution") is developed by
 * Nokia Corporation and is licensed pursuant to the OpenSSL open source
 * license.
 *
 * The Contribution, originally written by Mika Kousa and Pasi Eronen of
 * Nokia Corporation, consists of the "PSK" (Pre-Shared Key) ciphersuites
 * support (see RFC 4279) to OpenSSL.
 *
 * No patent licenses or other rights except those expressly stated in
 * the OpenSSL open source license shall be deemed granted or received
 * expressly, by implication, estoppel, or otherwise.
 *
 * No assurances are provided by Nokia that the Contribution does not
 * infringe the patent or other intellectual property rights of any third
 * party or that the license provides you with all the necessary rights
 * to make use of the Contribution.
 *
 * THE SOFTWARE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. IN
 * ADDITION TO THE DISCLAIMERS INCLUDED IN THE LICENSE, NOKIA
 * SPECIFICALLY DISCLAIMS ANY LIABILITY FOR CLAIMS BROUGHT BY YOU OR ANY
 * OTHER ENTITY BASED ON INFRINGEMENT OF INTELLECTUAL PROPERTY RIGHTS OR
 * OTHERWISE.
 */
 
#include <stdio.h>
#include "../ssl_locl.h"
#include "statem_locl.h"
#include "internal/constant_time_locl.h"
#include <openssl/buffer.h>
#include <openssl/rand.h>
#include <openssl/objects.h>
#include <openssl/evp.h>
#include <openssl/hmac.h>
#include <openssl/x509.h>
#include <openssl/bn.h>
#ifndef OPENSSL_NO_SM2
# include <openssl/sm2.h>
#endif
 
static STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
                                                      PACKET *cipher_suites,
                                                      STACK_OF(SSL_CIPHER)
                                                      **skp, int sslv2format,
                                                      int *al);
 
/*
 * server_read_transition() encapsulates the logic for the allowed handshake
 * state transitions when the server is reading messages from the client. The
 * message type that the client has sent is provided in |mt|. The current state
 * is in |s->statem.hand_state|.
 *
 *  Valid return values are:
 *  1: Success (transition allowed)
 *  0: Error (transition not allowed)
 */
int ossl_statem_server_read_transition(SSL *s, int mt)
{
    OSSL_STATEM *st = &s->statem;
 
    switch (st->hand_state) {
    case TLS_ST_BEFORE:
    case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
        if (mt == SSL3_MT_CLIENT_HELLO) {
            st->hand_state = TLS_ST_SR_CLNT_HELLO;
            return 1;
        }
        break;
 
    case TLS_ST_SW_SRVR_DONE:
        /*
         * If we get a CKE message after a ServerDone then either
         * 1) We didn't request a Certificate
         * OR
         * 2) If we did request one then
         *      a) We allow no Certificate to be returned
         *      AND
         *      b) We are running SSL3 (in TLS1.0+ the client must return a 0
         *         list if we requested a certificate)
         */
        if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) {
            if (s->s3->tmp.cert_request) {
                if (s->version == SSL3_VERSION) {
                    if ((s->verify_mode & SSL_VERIFY_PEER)
                        && (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
                        /*
                         * This isn't an unexpected message as such - we're just
                         * not going to accept it because we require a client
                         * cert.
                         */
                        ssl3_send_alert(s, SSL3_AL_FATAL,
                                        SSL3_AD_HANDSHAKE_FAILURE);
                        SSLerr(SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION,
                               SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
                        return 0;
                    }
                    st->hand_state = TLS_ST_SR_KEY_EXCH;
                    return 1;
                }
            } else {
                st->hand_state = TLS_ST_SR_KEY_EXCH;
                return 1;
            }
        } else if (s->s3->tmp.cert_request) {
            if (mt == SSL3_MT_CERTIFICATE) {
                st->hand_state = TLS_ST_SR_CERT;
                return 1;
            }
        }
        break;
 
    case TLS_ST_SR_CERT:
        if (mt == SSL3_MT_CLIENT_KEY_EXCHANGE) {
            st->hand_state = TLS_ST_SR_KEY_EXCH;
            return 1;
        }
        break;
 
    case TLS_ST_SR_KEY_EXCH:
        /*
         * We should only process a CertificateVerify message if we have
         * received a Certificate from the client. If so then |s->session->peer|
         * will be non NULL. In some instances a CertificateVerify message is
         * not required even if the peer has sent a Certificate (e.g. such as in
         * the case of static DH). In that case |st->no_cert_verify| should be
         * set.
         */
        if (s->session->peer == NULL || st->no_cert_verify) {
            if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
                /*
                 * For the ECDH ciphersuites when the client sends its ECDH
                 * pub key in a certificate, the CertificateVerify message is
                 * not sent. Also for GOST ciphersuites when the client uses
                 * its key from the certificate for key exchange.
                 */
                st->hand_state = TLS_ST_SR_CHANGE;
                return 1;
            }
        } else {
            if (mt == SSL3_MT_CERTIFICATE_VERIFY) {
                st->hand_state = TLS_ST_SR_CERT_VRFY;
                return 1;
            }
        }
        break;
 
    case TLS_ST_SR_CERT_VRFY:
        if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
            st->hand_state = TLS_ST_SR_CHANGE;
            return 1;
        }
        break;
 
    case TLS_ST_SR_CHANGE:
#ifndef OPENSSL_NO_NEXTPROTONEG
        if (s->s3->next_proto_neg_seen) {
            if (mt == SSL3_MT_NEXT_PROTO) {
                st->hand_state = TLS_ST_SR_NEXT_PROTO;
                return 1;
            }
        } else {
#endif
            if (mt == SSL3_MT_FINISHED) {
                st->hand_state = TLS_ST_SR_FINISHED;
                return 1;
            }
#ifndef OPENSSL_NO_NEXTPROTONEG
        }
#endif
        break;
 
#ifndef OPENSSL_NO_NEXTPROTONEG
    case TLS_ST_SR_NEXT_PROTO:
        if (mt == SSL3_MT_FINISHED) {
            st->hand_state = TLS_ST_SR_FINISHED;
            return 1;
        }
        break;
#endif
 
    case TLS_ST_SW_FINISHED:
        if (mt == SSL3_MT_CHANGE_CIPHER_SPEC) {
            st->hand_state = TLS_ST_SR_CHANGE;
            return 1;
        }
        break;
 
    default:
        break;
    }
 
    /* No valid transition found */
    ssl3_send_alert(s, SSL3_AL_FATAL, SSL3_AD_UNEXPECTED_MESSAGE);
    SSLerr(SSL_F_OSSL_STATEM_SERVER_READ_TRANSITION, SSL_R_UNEXPECTED_MESSAGE);
    return 0;
}
 
/*
 * Should we send a ServerKeyExchange message?
 *
 * Valid return values are:
 *   1: Yes
 *   0: No
 */
static int send_server_key_exchange(SSL *s)
{
    unsigned long alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 
#ifndef OPENSSL_NO_GMTLS
    if (SSL_IS_GMTLS(s))
        return 1;
#endif
 
    /*
     * only send a ServerKeyExchange if DH or fortezza but we have a
     * sign only certificate PSK: may send PSK identity hints For
     * ECC ciphersuites, we send a serverKeyExchange message only if
     * the cipher suite is either ECDH-anon or ECDHE. In other cases,
     * the server certificate contains the server's public key for
     * key exchange.
     */
    if (alg_k & (SSL_kDHE | SSL_kECDHE | SSL_kSM2DHE)
        /*
         * PSK: send ServerKeyExchange if PSK identity hint if
         * provided
         */
#ifndef OPENSSL_NO_PSK
        /* Only send SKE if we have identity hint for plain PSK */
        || ((alg_k & (SSL_kPSK | SSL_kRSAPSK))
            && s->cert->psk_identity_hint)
        /* For other PSK always send SKE */
        || (alg_k & (SSL_PSK & (SSL_kDHEPSK | SSL_kECDHEPSK | SSL_kSM2PSK)))
#endif
#ifndef OPENSSL_NO_SRP
        /* SRP: send ServerKeyExchange */
        || (alg_k & SSL_kSRP)
#endif
        ) {
        return 1;
    }
 
    return 0;
}
 
/*
 * Should we send a CertificateRequest message?
 *
 * Valid return values are:
 *   1: Yes
 *   0: No
 */
static int send_certificate_request(SSL *s)
{
    if (
           /* don't request cert unless asked for it: */
           s->verify_mode & SSL_VERIFY_PEER
           /*
            * if SSL_VERIFY_CLIENT_ONCE is set, don't request cert
            * during re-negotiation:
            */
           && (s->s3->tmp.finish_md_len == 0 ||
               !(s->verify_mode & SSL_VERIFY_CLIENT_ONCE))
           /*
            * never request cert in anonymous ciphersuites (see
            * section "Certificate request" in SSL 3 drafts and in
            * RFC 2246):
            */
           && (!(s->s3->tmp.new_cipher->algorithm_auth & SSL_aNULL)
               /*
                * ... except when the application insists on
                * verification (against the specs, but statem_clnt.c accepts
                * this for SSL 3)
                */
               || (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT))
           /* don't request certificate for SRP auth */
           && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aSRP)
           /*
            * With normal PSK Certificates and Certificate Requests
            * are omitted
            */
           && !(s->s3->tmp.new_cipher->algorithm_auth & SSL_aPSK)) {
        return 1;
    }
 
    return 0;
}
 
/*
 * server_write_transition() works out what handshake state to move to next
 * when the server is writing messages to be sent to the client.
 */
WRITE_TRAN ossl_statem_server_write_transition(SSL *s)
{
    OSSL_STATEM *st = &s->statem;
 
    switch (st->hand_state) {
    case TLS_ST_BEFORE:
        /* Just go straight to trying to read from the client */
        return WRITE_TRAN_FINISHED;
 
    case TLS_ST_OK:
        /* We must be trying to renegotiate */
        st->hand_state = TLS_ST_SW_HELLO_REQ;
        return WRITE_TRAN_CONTINUE;
 
    case TLS_ST_SW_HELLO_REQ:
        st->hand_state = TLS_ST_OK;
        ossl_statem_set_in_init(s, 0);
        return WRITE_TRAN_CONTINUE;
 
    case TLS_ST_SR_CLNT_HELLO:
        if (SSL_IS_DTLS(s) && !s->d1->cookie_verified
            && (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE))
            st->hand_state = DTLS_ST_SW_HELLO_VERIFY_REQUEST;
        else
            st->hand_state = TLS_ST_SW_SRVR_HELLO;
        return WRITE_TRAN_CONTINUE;
 
    case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
        return WRITE_TRAN_FINISHED;
 
    case TLS_ST_SW_SRVR_HELLO:
        if (s->hit) {
            if (s->tlsext_ticket_expected)
                st->hand_state = TLS_ST_SW_SESSION_TICKET;
            else
                st->hand_state = TLS_ST_SW_CHANGE;
        } else {
            /* Check if it is anon DH or anon ECDH, */
            /* normal PSK or SRP */
            if (!(s->s3->tmp.new_cipher->algorithm_auth &
                  (SSL_aNULL | SSL_aSRP | SSL_aPSK))) {
                st->hand_state = TLS_ST_SW_CERT;
            } else if (send_server_key_exchange(s)) {
                st->hand_state = TLS_ST_SW_KEY_EXCH;
            } else if (send_certificate_request(s)) {
                st->hand_state = TLS_ST_SW_CERT_REQ;
            } else {
                st->hand_state = TLS_ST_SW_SRVR_DONE;
            }
        }
        return WRITE_TRAN_CONTINUE;
 
    case TLS_ST_SW_CERT:
        if (s->tlsext_status_expected) {
            st->hand_state = TLS_ST_SW_CERT_STATUS;
            return WRITE_TRAN_CONTINUE;
        }
        /* Fall through */
 
    case TLS_ST_SW_CERT_STATUS:
        if (send_server_key_exchange(s)) {
            st->hand_state = TLS_ST_SW_KEY_EXCH;
            return WRITE_TRAN_CONTINUE;
        }
        /* Fall through */
 
    case TLS_ST_SW_KEY_EXCH:
        if (send_certificate_request(s)) {
            st->hand_state = TLS_ST_SW_CERT_REQ;
            return WRITE_TRAN_CONTINUE;
        }
        /* Fall through */
 
    case TLS_ST_SW_CERT_REQ:
        st->hand_state = TLS_ST_SW_SRVR_DONE;
        return WRITE_TRAN_CONTINUE;
 
    case TLS_ST_SW_SRVR_DONE:
        return WRITE_TRAN_FINISHED;
 
    case TLS_ST_SR_FINISHED:
        if (s->hit) {
            st->hand_state = TLS_ST_OK;
            ossl_statem_set_in_init(s, 0);
            return WRITE_TRAN_CONTINUE;
        } else if (s->tlsext_ticket_expected) {
            st->hand_state = TLS_ST_SW_SESSION_TICKET;
        } else {
            st->hand_state = TLS_ST_SW_CHANGE;
        }
        return WRITE_TRAN_CONTINUE;
 
    case TLS_ST_SW_SESSION_TICKET:
        st->hand_state = TLS_ST_SW_CHANGE;
        return WRITE_TRAN_CONTINUE;
 
    case TLS_ST_SW_CHANGE:
        st->hand_state = TLS_ST_SW_FINISHED;
        return WRITE_TRAN_CONTINUE;
 
    case TLS_ST_SW_FINISHED:
        if (s->hit) {
            return WRITE_TRAN_FINISHED;
        }
        st->hand_state = TLS_ST_OK;
        ossl_statem_set_in_init(s, 0);
        return WRITE_TRAN_CONTINUE;
 
    default:
        /* Shouldn't happen */
        return WRITE_TRAN_ERROR;
    }
}
 
/*
 * Perform any pre work that needs to be done prior to sending a message from
 * the server to the client.
 */
WORK_STATE ossl_statem_server_pre_work(SSL *s, WORK_STATE wst)
{
    OSSL_STATEM *st = &s->statem;
 
    switch (st->hand_state) {
    case TLS_ST_SW_HELLO_REQ:
        s->shutdown = 0;
        if (SSL_IS_DTLS(s))
            dtls1_clear_sent_buffer(s);
        break;
 
    case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
        s->shutdown = 0;
        if (SSL_IS_DTLS(s)) {
            dtls1_clear_sent_buffer(s);
            /* We don't buffer this message so don't use the timer */
            st->use_timer = 0;
        }
        break;
 
    case TLS_ST_SW_SRVR_HELLO:
        if (SSL_IS_DTLS(s)) {
            /*
             * Messages we write from now on should be bufferred and
             * retransmitted if necessary, so we need to use the timer now
             */
            st->use_timer = 1;
        }
        break;
 
    case TLS_ST_SW_SRVR_DONE:
#ifndef OPENSSL_NO_SCTP
        if (SSL_IS_DTLS(s) && BIO_dgram_is_sctp(SSL_get_wbio(s)))
            return dtls_wait_for_dry(s);
#endif
        return WORK_FINISHED_CONTINUE;
 
    case TLS_ST_SW_SESSION_TICKET:
        if (SSL_IS_DTLS(s)) {
            /*
             * We're into the last flight. We don't retransmit the last flight
             * unless we need to, so we don't use the timer
             */
            st->use_timer = 0;
        }
        break;
 
    case TLS_ST_SW_CHANGE:
        s->session->cipher = s->s3->tmp.new_cipher;
        if (!s->method->ssl3_enc->setup_key_block(s)) {
            ossl_statem_set_error(s);
            return WORK_ERROR;
        }
        if (SSL_IS_DTLS(s)) {
            /*
             * We're into the last flight. We don't retransmit the last flight
             * unless we need to, so we don't use the timer. This might have
             * already been set to 0 if we sent a NewSessionTicket message,
             * but we'll set it again here in case we didn't.
             */
            st->use_timer = 0;
        }
        return WORK_FINISHED_CONTINUE;
 
    case TLS_ST_OK:
        return tls_finish_handshake(s, wst);
 
    default:
        /* No pre work to be done */
        break;
    }
 
    return WORK_FINISHED_CONTINUE;
}
 
/*
 * Perform any work that needs to be done after sending a message from the
 * server to the client.
 */
WORK_STATE ossl_statem_server_post_work(SSL *s, WORK_STATE wst)
{
    OSSL_STATEM *st = &s->statem;
 
    s->init_num = 0;
 
    switch (st->hand_state) {
    case TLS_ST_SW_HELLO_REQ:
        if (statem_flush(s) != 1)
            return WORK_MORE_A;
        if (!ssl3_init_finished_mac(s)) {
            ossl_statem_set_error(s);
            return WORK_ERROR;
        }
        break;
 
    case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
        if (statem_flush(s) != 1)
            return WORK_MORE_A;
        /* HelloVerifyRequest resets Finished MAC */
        if (s->version != DTLS1_BAD_VER && !ssl3_init_finished_mac(s)) {
            ossl_statem_set_error(s);
            return WORK_ERROR;
        }
        /*
         * The next message should be another ClientHello which we need to
         * treat like it was the first packet
         */
        s->first_packet = 1;
        break;
 
    case TLS_ST_SW_SRVR_HELLO:
#ifndef OPENSSL_NO_SCTP
        if (SSL_IS_DTLS(s) && s->hit) {
            unsigned char sctpauthkey[64];
            char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
 
            /*
             * Add new shared key for SCTP-Auth, will be ignored if no
             * SCTP used.
             */
            memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
                   sizeof(DTLS1_SCTP_AUTH_LABEL));
 
            if (SSL_export_keying_material(s, sctpauthkey,
                                           sizeof(sctpauthkey), labelbuffer,
                                           sizeof(labelbuffer), NULL, 0,
                                           0) <= 0) {
                ossl_statem_set_error(s);
                return WORK_ERROR;
            }
 
            BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
                     sizeof(sctpauthkey), sctpauthkey);
        }
#endif
        break;
 
    case TLS_ST_SW_CHANGE:
#ifndef OPENSSL_NO_SCTP
        if (SSL_IS_DTLS(s) && !s->hit) {
            /*
             * Change to new shared key of SCTP-Auth, will be ignored if
             * no SCTP used.
             */
            BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
                     0, NULL);
        }
#endif
        if (!s->method->ssl3_enc->change_cipher_state(s,
                                                      SSL3_CHANGE_CIPHER_SERVER_WRITE))
        {
            ossl_statem_set_error(s);
            return WORK_ERROR;
        }
 
        if (SSL_IS_DTLS(s))
            dtls1_reset_seq_numbers(s, SSL3_CC_WRITE);
        break;
 
    case TLS_ST_SW_SRVR_DONE:
        if (statem_flush(s) != 1)
            return WORK_MORE_A;
        break;
 
    case TLS_ST_SW_FINISHED:
        if (statem_flush(s) != 1)
            return WORK_MORE_A;
#ifndef OPENSSL_NO_SCTP
        if (SSL_IS_DTLS(s) && s->hit) {
            /*
             * Change to new shared key of SCTP-Auth, will be ignored if
             * no SCTP used.
             */
            BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_NEXT_AUTH_KEY,
                     0, NULL);
        }
#endif
        break;
 
    default:
        /* No post work to be done */
        break;
    }
 
    return WORK_FINISHED_CONTINUE;
}
 
/*
 * Construct a message to be sent from the server to the client.
 *
 * Valid return values are:
 *   1: Success
 *   0: Error
 */
int ossl_statem_server_construct_message(SSL *s)
{
    OSSL_STATEM *st = &s->statem;
 
    switch (st->hand_state) {
    case DTLS_ST_SW_HELLO_VERIFY_REQUEST:
        return dtls_construct_hello_verify_request(s);
 
    case TLS_ST_SW_HELLO_REQ:
        return tls_construct_hello_request(s);
 
    case TLS_ST_SW_SRVR_HELLO:
        return tls_construct_server_hello(s);
 
    case TLS_ST_SW_CERT:
#ifndef OPENSSL_NO_GMTLS
        if (SSL_IS_GMTLS(s))
            return gmtls_construct_server_certificate(s);
#endif
        return tls_construct_server_certificate(s);
 
    case TLS_ST_SW_KEY_EXCH:
#ifndef OPENSSL_NO_GMTLS
        if (SSL_IS_GMTLS(s))
            return gmtls_construct_server_key_exchange(s);
#endif
        return tls_construct_server_key_exchange(s);
 
    case TLS_ST_SW_CERT_REQ:
        return tls_construct_certificate_request(s);
 
    case TLS_ST_SW_SRVR_DONE:
        return tls_construct_server_done(s);
 
    case TLS_ST_SW_SESSION_TICKET:
        return tls_construct_new_session_ticket(s);
 
    case TLS_ST_SW_CERT_STATUS:
        return tls_construct_cert_status(s);
 
    case TLS_ST_SW_CHANGE:
        if (SSL_IS_DTLS(s))
            return dtls_construct_change_cipher_spec(s);
        else
            return tls_construct_change_cipher_spec(s);
 
    case TLS_ST_SW_FINISHED:
        return tls_construct_finished(s,
                                      s->method->
                                      ssl3_enc->server_finished_label,
                                      s->method->
                                      ssl3_enc->server_finished_label_len);
 
    default:
        /* Shouldn't happen */
        break;
    }
 
    return 0;
}
 
/*
 * Maximum size (excluding the Handshake header) of a ClientHello message,
 * calculated as follows:
 *
 *  2 + # client_version
 *  32 + # only valid length for random
 *  1 + # length of session_id
 *  32 + # maximum size for session_id
 *  2 + # length of cipher suites
 *  2^16-2 + # maximum length of cipher suites array
 *  1 + # length of compression_methods
 *  2^8-1 + # maximum length of compression methods
 *  2 + # length of extensions
 *  2^16-1 # maximum length of extensions
 */
#define CLIENT_HELLO_MAX_LENGTH         131396
 
#define CLIENT_KEY_EXCH_MAX_LENGTH      2048
#define NEXT_PROTO_MAX_LENGTH           514
 
/*
 * Returns the maximum allowed length for the current message that we are
 * reading. Excludes the message header.
 */
unsigned long ossl_statem_server_max_message_size(SSL *s)
{
    OSSL_STATEM *st = &s->statem;
 
    switch (st->hand_state) {
    case TLS_ST_SR_CLNT_HELLO:
        return CLIENT_HELLO_MAX_LENGTH;
 
    case TLS_ST_SR_CERT:
        return s->max_cert_list;
 
    case TLS_ST_SR_KEY_EXCH:
        return CLIENT_KEY_EXCH_MAX_LENGTH;
 
    case TLS_ST_SR_CERT_VRFY:
        return SSL3_RT_MAX_PLAIN_LENGTH;
 
#ifndef OPENSSL_NO_NEXTPROTONEG
    case TLS_ST_SR_NEXT_PROTO:
        return NEXT_PROTO_MAX_LENGTH;
#endif
 
    case TLS_ST_SR_CHANGE:
        return CCS_MAX_LENGTH;
 
    case TLS_ST_SR_FINISHED:
        return FINISHED_MAX_LENGTH;
 
    default:
        /* Shouldn't happen */
        break;
    }
 
    return 0;
}
 
/*
 * Process a message that the server has received from the client.
 */
MSG_PROCESS_RETURN ossl_statem_server_process_message(SSL *s, PACKET *pkt)
{
    OSSL_STATEM *st = &s->statem;
 
    switch (st->hand_state) {
    case TLS_ST_SR_CLNT_HELLO:
        return tls_process_client_hello(s, pkt);
 
    case TLS_ST_SR_CERT:
#ifndef OPENSSL_NO_GMTLS
        if (SSL_IS_GMTLS(s))
            return tls_process_client_certificate(s, pkt);
#endif
        return tls_process_client_certificate(s, pkt);
 
    case TLS_ST_SR_KEY_EXCH:
#ifndef OPENSSL_NO_GMTLS
        if (SSL_IS_GMTLS(s))
            return gmtls_process_client_key_exchange(s, pkt);
#endif
        return tls_process_client_key_exchange(s, pkt);
 
    case TLS_ST_SR_CERT_VRFY:
        return tls_process_cert_verify(s, pkt);
 
#ifndef OPENSSL_NO_NEXTPROTONEG
    case TLS_ST_SR_NEXT_PROTO:
        return tls_process_next_proto(s, pkt);
#endif
 
    case TLS_ST_SR_CHANGE:
        return tls_process_change_cipher_spec(s, pkt);
 
    case TLS_ST_SR_FINISHED:
        return tls_process_finished(s, pkt);
 
    default:
        /* Shouldn't happen */
        break;
    }
 
    return MSG_PROCESS_ERROR;
}
 
/*
 * Perform any further processing required following the receipt of a message
 * from the client
 */
WORK_STATE ossl_statem_server_post_process_message(SSL *s, WORK_STATE wst)
{
    OSSL_STATEM *st = &s->statem;
 
    switch (st->hand_state) {
    case TLS_ST_SR_CLNT_HELLO:
        return tls_post_process_client_hello(s, wst);
 
    case TLS_ST_SR_KEY_EXCH:
        return tls_post_process_client_key_exchange(s, wst);
 
    case TLS_ST_SR_CERT_VRFY:
#ifndef OPENSSL_NO_SCTP
        if (                    /* Is this SCTP? */
               BIO_dgram_is_sctp(SSL_get_wbio(s))
               /* Are we renegotiating? */
               && s->renegotiate && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
            s->s3->in_read_app_data = 2;
            s->rwstate = SSL_READING;
            BIO_clear_retry_flags(SSL_get_rbio(s));
            BIO_set_retry_read(SSL_get_rbio(s));
            ossl_statem_set_sctp_read_sock(s, 1);
            return WORK_MORE_A;
        } else {
            ossl_statem_set_sctp_read_sock(s, 0);
        }
#endif
        return WORK_FINISHED_CONTINUE;
 
    default:
        break;
    }
 
    /* Shouldn't happen */
    return WORK_ERROR;
}
 
#ifndef OPENSSL_NO_SRP
static int ssl_check_srp_ext_ClientHello(SSL *s, int *al)
{
    int ret = SSL_ERROR_NONE;
 
    *al = SSL_AD_UNRECOGNIZED_NAME;
 
    if ((s->s3->tmp.new_cipher->algorithm_mkey & SSL_kSRP) &&
        (s->srp_ctx.TLS_ext_srp_username_callback != NULL)) {
        if (s->srp_ctx.login == NULL) {
            /*
             * RFC 5054 says SHOULD reject, we do so if There is no srp
             * login name
             */
            ret = SSL3_AL_FATAL;
            *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
        } else {
            ret = SSL_srp_server_param_with_username(s, al);
        }
    }
    return ret;
}
#endif
 
int tls_construct_hello_request(SSL *s)
{
    if (!ssl_set_handshake_header(s, SSL3_MT_HELLO_REQUEST, 0)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_HELLO_REQUEST, ERR_R_INTERNAL_ERROR);
        ossl_statem_set_error(s);
        return 0;
    }
 
    return 1;
}
 
unsigned int dtls_raw_hello_verify_request(unsigned char *buf,
                                           unsigned char *cookie,
                                           unsigned char cookie_len)
{
    unsigned int msg_len;
    unsigned char *p;
 
    p = buf;
    /* Always use DTLS 1.0 version: see RFC 6347 */
    *(p++) = DTLS1_VERSION >> 8;
    *(p++) = DTLS1_VERSION & 0xFF;
 
    *(p++) = (unsigned char)cookie_len;
    memcpy(p, cookie, cookie_len);
    p += cookie_len;
    msg_len = p - buf;
 
    return msg_len;
}
 
int dtls_construct_hello_verify_request(SSL *s)
{
    unsigned int len;
    unsigned char *buf;
 
    buf = (unsigned char *)s->init_buf->data;
 
    if (s->ctx->app_gen_cookie_cb == NULL ||
        s->ctx->app_gen_cookie_cb(s, s->d1->cookie,
                                  &(s->d1->cookie_len)) == 0 ||
        s->d1->cookie_len > 255) {
        SSLerr(SSL_F_DTLS_CONSTRUCT_HELLO_VERIFY_REQUEST,
               SSL_R_COOKIE_GEN_CALLBACK_FAILURE);
        ossl_statem_set_error(s);
        return 0;
    }
 
    len = dtls_raw_hello_verify_request(&buf[DTLS1_HM_HEADER_LENGTH],
                                        s->d1->cookie, s->d1->cookie_len);
 
    dtls1_set_message_header(s, DTLS1_MT_HELLO_VERIFY_REQUEST, len, 0, len);
    len += DTLS1_HM_HEADER_LENGTH;
 
    /* number of bytes to write */
    s->init_num = len;
    s->init_off = 0;
 
    return 1;
}
 
MSG_PROCESS_RETURN tls_process_client_hello(SSL *s, PACKET *pkt)
{
    int i, al = SSL_AD_INTERNAL_ERROR;
    unsigned int j, complen = 0;
    unsigned long id;
    const SSL_CIPHER *c;
#ifndef OPENSSL_NO_COMP
    SSL_COMP *comp = NULL;
#endif
    STACK_OF(SSL_CIPHER) *ciphers = NULL;
    int protverr;
    /* |cookie| will only be initialized for DTLS. */
    PACKET session_id, cipher_suites, compression, extensions, cookie;
    int is_v2_record;
    static const unsigned char null_compression = 0;
 
    is_v2_record = RECORD_LAYER_is_sslv2_record(&s->rlayer);
 
    PACKET_null_init(&cookie);
    /* First lets get s->client_version set correctly */
    if (is_v2_record) {
        unsigned int version;
        unsigned int mt;
        /*-
         * An SSLv3/TLSv1 backwards-compatible CLIENT-HELLO in an SSLv2
         * header is sent directly on the wire, not wrapped as a TLS
         * record. Our record layer just processes the message length and passes
         * the rest right through. Its format is:
         * Byte  Content
         * 0-1   msg_length - decoded by the record layer
         * 2     msg_type - s->init_msg points here
         * 3-4   version
         * 5-6   cipher_spec_length
         * 7-8   session_id_length
         * 9-10  challenge_length
         * ...   ...
         */
 
        if (!PACKET_get_1(pkt, &mt)
            || mt != SSL2_MT_CLIENT_HELLO) {
            /*
             * Should never happen. We should have tested this in the record
             * layer in order to have determined that this is a SSLv2 record
             * in the first place
             */
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
            goto err;
        }
 
        if (!PACKET_get_net_2(pkt, &version)) {
            /* No protocol version supplied! */
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
            goto err;
        }
        if (version == 0x0002) {
            /* This is real SSLv2. We don't support it. */
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
            goto err;
        } else if ((version & 0xff00) == (SSL3_VERSION_MAJOR << 8)) {
            /* SSLv3/TLS */
            s->client_version = version;
#ifndef OPENSSL_NO_GMTLS
        } else if (version == GMTLS_VERSION) {
            s->client_version = version;
#endif
        } else {
            /* No idea what protocol this is */
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_UNKNOWN_PROTOCOL);
            goto err;
        }
    } else {
        /*
         * use version from inside client hello, not from record header (may
         * differ: see RFC 2246, Appendix E, second paragraph)
         */
        if (!PACKET_get_net_2(pkt, (unsigned int *)&s->client_version)) {
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_TOO_SHORT);
            goto f_err;
        }
    }
 
    /*
     * Do SSL/TLS version negotiation if applicable. For DTLS we just check
     * versions are potentially compatible. Version negotiation comes later.
     */
    if (!SSL_IS_DTLS(s)) {
        protverr = ssl_choose_server_version(s);
    } else if (s->method->version != DTLS_ANY_VERSION &&
               DTLS_VERSION_LT(s->client_version, s->version)) {
        protverr = SSL_R_VERSION_TOO_LOW;
    } else {
        protverr = 0;
    }
 
    if (protverr) {
        SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr);
        if ((!s->enc_write_ctx && !s->write_hash)) {
            /*
             * similar to ssl3_get_record, send alert using remote version
             * number
             */
            s->version = s->client_version;
        }
        al = SSL_AD_PROTOCOL_VERSION;
        goto f_err;
    }
 
    /* Parse the message and load client random. */
    if (is_v2_record) {
        /*
         * Handle an SSLv2 backwards compatible ClientHello
         * Note, this is only for SSLv3+ using the backward compatible format.
         * Real SSLv2 is not supported, and is rejected above.
         */
        unsigned int cipher_len, session_id_len, challenge_len;
        PACKET challenge;
 
        if (!PACKET_get_net_2(pkt, &cipher_len)
            || !PACKET_get_net_2(pkt, &session_id_len)
            || !PACKET_get_net_2(pkt, &challenge_len)) {
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
                   SSL_R_RECORD_LENGTH_MISMATCH);
            al = SSL_AD_DECODE_ERROR;
            goto f_err;
        }
 
        if (session_id_len > SSL_MAX_SSL_SESSION_ID_LENGTH) {
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
            goto f_err;
        }
 
        if (!PACKET_get_sub_packet(pkt, &cipher_suites, cipher_len)
            || !PACKET_get_sub_packet(pkt, &session_id, session_id_len)
            || !PACKET_get_sub_packet(pkt, &challenge, challenge_len)
            /* No extensions. */
            || PACKET_remaining(pkt) != 0) {
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
                   SSL_R_RECORD_LENGTH_MISMATCH);
            al = SSL_AD_DECODE_ERROR;
            goto f_err;
        }
 
        /* Load the client random and compression list. */
        challenge_len = challenge_len > SSL3_RANDOM_SIZE ? SSL3_RANDOM_SIZE :
            challenge_len;
        memset(s->s3->client_random, 0, SSL3_RANDOM_SIZE);
        if (!PACKET_copy_bytes(&challenge,
                               s->s3->client_random + SSL3_RANDOM_SIZE -
                               challenge_len, challenge_len)
            /* Advertise only null compression. */
            || !PACKET_buf_init(&compression, &null_compression, 1)) {
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
            al = SSL_AD_INTERNAL_ERROR;
            goto f_err;
        }
 
        PACKET_null_init(&extensions);
    } else {
        /* Regular ClientHello. */
        if (!PACKET_copy_bytes(pkt, s->s3->client_random, SSL3_RANDOM_SIZE)
            || !PACKET_get_length_prefixed_1(pkt, &session_id)) {
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
            goto f_err;
        }
 
        if (PACKET_remaining(&session_id) > SSL_MAX_SSL_SESSION_ID_LENGTH) {
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
            goto f_err;
        }
 
        if (SSL_IS_DTLS(s)) {
            if (!PACKET_get_length_prefixed_1(pkt, &cookie)) {
                al = SSL_AD_DECODE_ERROR;
                SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
                goto f_err;
            }
            /*
             * If we require cookies and this ClientHello doesn't contain one,
             * just return since we do not want to allocate any memory yet.
             * So check cookie length...
             */
            if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
                if (PACKET_remaining(&cookie) == 0)
                    return 1;
            }
        }
 
        if (!PACKET_get_length_prefixed_2(pkt, &cipher_suites)
            || !PACKET_get_length_prefixed_1(pkt, &compression)) {
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_LENGTH_MISMATCH);
            goto f_err;
        }
        /* Could be empty. */
        extensions = *pkt;
    }
 
    if (SSL_IS_DTLS(s)) {
        /* Empty cookie was already handled above by returning early. */
        if (SSL_get_options(s) & SSL_OP_COOKIE_EXCHANGE) {
            if (s->ctx->app_verify_cookie_cb != NULL) {
                if (s->ctx->app_verify_cookie_cb(s, PACKET_data(&cookie),
                                                 PACKET_remaining(&cookie)) ==
                    0) {
                    al = SSL_AD_HANDSHAKE_FAILURE;
                    SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
                           SSL_R_COOKIE_MISMATCH);
                    goto f_err;
                    /* else cookie verification succeeded */
                }
                /* default verification */
            } else if (!PACKET_equal(&cookie, s->d1->cookie, s->d1->cookie_len)) {
                al = SSL_AD_HANDSHAKE_FAILURE;
                SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_COOKIE_MISMATCH);
                goto f_err;
            }
            s->d1->cookie_verified = 1;
        }
        if (s->method->version == DTLS_ANY_VERSION) {
            protverr = ssl_choose_server_version(s);
            if (protverr != 0) {
                SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, protverr);
                s->version = s->client_version;
                al = SSL_AD_PROTOCOL_VERSION;
                goto f_err;
            }
        }
    }
 
    s->hit = 0;
 
    /*
     * We don't allow resumption in a backwards compatible ClientHello.
     * TODO(openssl-team): in TLS1.1+, session_id MUST be empty.
     *
     * Versions before 0.9.7 always allow clients to resume sessions in
     * renegotiation. 0.9.7 and later allow this by default, but optionally
     * ignore resumption requests with flag
     * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION (it's a new flag rather
     * than a change to default behavior so that applications relying on
     * this for security won't even compile against older library versions).
     * 1.0.1 and later also have a function SSL_renegotiate_abbreviated() to
     * request renegotiation but not a new session (s->new_session remains
     * unset): for servers, this essentially just means that the
     * SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION setting will be
     * ignored.
     */
    if (is_v2_record ||
        (s->new_session &&
         (s->options & SSL_OP_NO_SESSION_RESUMPTION_ON_RENEGOTIATION))) {
        if (!ssl_get_new_session(s, 1))
            goto err;
    } else {
        i = ssl_get_prev_session(s, &extensions, &session_id);
        /*
         * Only resume if the session's version matches the negotiated
         * version.
         * RFC 5246 does not provide much useful advice on resumption
         * with a different protocol version. It doesn't forbid it but
         * the sanity of such behaviour would be questionable.
         * In practice, clients do not accept a version mismatch and
         * will abort the handshake with an error.
         */
        if (i == 1 && s->version == s->session->ssl_version) {
            /* previous session */
            s->hit = 1;
        } else if (i == -1) {
            goto err;
        } else {
            /* i == 0 */
            if (!ssl_get_new_session(s, 1))
                goto err;
        }
    }
 
    if (ssl_bytes_to_cipher_list(s, &cipher_suites, &(ciphers),
                                 is_v2_record, &al) == NULL) {
        goto f_err;
    }
 
    /* If it is a hit, check that the cipher is in the list */
    if (s->hit) {
        j = 0;
        id = s->session->cipher->id;
 
#ifdef CIPHER_DEBUG
        fprintf(stderr, "client sent %d ciphers\n", sk_SSL_CIPHER_num(ciphers));
#endif
        for (i = 0; i < sk_SSL_CIPHER_num(ciphers); i++) {
            c = sk_SSL_CIPHER_value(ciphers, i);
#ifdef CIPHER_DEBUG
            fprintf(stderr, "client [%2d of %2d]:%s\n",
                    i, sk_SSL_CIPHER_num(ciphers), SSL_CIPHER_get_name(c));
#endif
            if (c->id == id) {
                j = 1;
                break;
            }
        }
        if (j == 0) {
            /*
             * we need to have the cipher in the cipher list if we are asked
             * to reuse it
             */
            al = SSL_AD_ILLEGAL_PARAMETER;
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
                   SSL_R_REQUIRED_CIPHER_MISSING);
            goto f_err;
        }
    }
 
    complen = PACKET_remaining(&compression);
    for (j = 0; j < complen; j++) {
        if (PACKET_data(&compression)[j] == 0)
            break;
    }
 
    if (j >= complen) {
        /* no compress */
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_COMPRESSION_SPECIFIED);
        goto f_err;
    }
 
    /* TLS extensions */
    if (s->version >= SSL3_VERSION) {
        if (!ssl_parse_clienthello_tlsext(s, &extensions)) {
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_PARSE_TLSEXT);
            goto err;
        }
    }
 
    /*
     * Check if we want to use external pre-shared secret for this handshake
     * for not reused session only. We need to generate server_random before
     * calling tls_session_secret_cb in order to allow SessionTicket
     * processing to use it in key derivation.
     */
    {
        unsigned char *pos;
        pos = s->s3->server_random;
        if (ssl_fill_hello_random(s, 1, pos, SSL3_RANDOM_SIZE) <= 0) {
            goto f_err;
        }
    }
 
#ifndef OPENSSL_NO_GMTLS
    if (!s->hit && (s->version == GMTLS_VERSION || s->version >= TLS1_VERSION)
	&& s->tls_session_secret_cb) {
#else
    if (!s->hit && s->version >= TLS1_VERSION && s->tls_session_secret_cb) {
#endif
        const SSL_CIPHER *pref_cipher = NULL;
 
        s->session->master_key_length = sizeof(s->session->master_key);
        if (s->tls_session_secret_cb(s, s->session->master_key,
                                     &s->session->master_key_length, ciphers,
                                     &pref_cipher,
                                     s->tls_session_secret_cb_arg)) {
            s->hit = 1;
            s->session->ciphers = ciphers;
            s->session->verify_result = X509_V_OK;
 
            ciphers = NULL;
 
            /* check if some cipher was preferred by call back */
            pref_cipher =
                pref_cipher ? pref_cipher : ssl3_choose_cipher(s,
                                                               s->
                                                               session->ciphers,
                                                               SSL_get_ciphers
                                                               (s));
            if (pref_cipher == NULL) {
                al = SSL_AD_HANDSHAKE_FAILURE;
                SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_NO_SHARED_CIPHER);
                goto f_err;
            }
 
            s->session->cipher = pref_cipher;
            sk_SSL_CIPHER_free(s->cipher_list);
            s->cipher_list = sk_SSL_CIPHER_dup(s->session->ciphers);
            sk_SSL_CIPHER_free(s->cipher_list_by_id);
            s->cipher_list_by_id = sk_SSL_CIPHER_dup(s->session->ciphers);
        }
    }
 
    /*
     * Worst case, we will use the NULL compression, but if we have other
     * options, we will now look for them.  We have complen-1 compression
     * algorithms from the client, starting at q.
     */
    s->s3->tmp.new_compression = NULL;
#ifndef OPENSSL_NO_COMP
    /* This only happens if we have a cache hit */
    if (s->session->compress_meth != 0) {
        int m, comp_id = s->session->compress_meth;
        unsigned int k;
        /* Perform sanity checks on resumed compression algorithm */
        /* Can't disable compression */
        if (!ssl_allow_compression(s)) {
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
                   SSL_R_INCONSISTENT_COMPRESSION);
            goto f_err;
        }
        /* Look for resumed compression method */
        for (m = 0; m < sk_SSL_COMP_num(s->ctx->comp_methods); m++) {
            comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
            if (comp_id == comp->id) {
                s->s3->tmp.new_compression = comp;
                break;
            }
        }
        if (s->s3->tmp.new_compression == NULL) {
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
                   SSL_R_INVALID_COMPRESSION_ALGORITHM);
            goto f_err;
        }
        /* Look for resumed method in compression list */
        for (k = 0; k < complen; k++) {
            if (PACKET_data(&compression)[k] == comp_id)
                break;
        }
        if (k >= complen) {
            al = SSL_AD_ILLEGAL_PARAMETER;
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO,
                   SSL_R_REQUIRED_COMPRESSION_ALGORITHM_MISSING);
            goto f_err;
        }
    } else if (s->hit)
        comp = NULL;
    else if (ssl_allow_compression(s) && s->ctx->comp_methods) {
        /* See if we have a match */
        int m, nn, v, done = 0;
        unsigned int o;
 
        nn = sk_SSL_COMP_num(s->ctx->comp_methods);
        for (m = 0; m < nn; m++) {
            comp = sk_SSL_COMP_value(s->ctx->comp_methods, m);
            v = comp->id;
            for (o = 0; o < complen; o++) {
                if (v == PACKET_data(&compression)[o]) {
                    done = 1;
                    break;
                }
            }
            if (done)
                break;
        }
        if (done)
            s->s3->tmp.new_compression = comp;
        else
            comp = NULL;
    }
#else
    /*
     * If compression is disabled we'd better not try to resume a session
     * using compression.
     */
    if (s->session->compress_meth != 0) {
        SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_INCONSISTENT_COMPRESSION);
        goto f_err;
    }
#endif
 
    /*
     * Given s->session->ciphers and SSL_get_ciphers, we must pick a cipher
     */
 
    if (!s->hit) {
#ifdef OPENSSL_NO_COMP
        s->session->compress_meth = 0;
#else
        s->session->compress_meth = (comp == NULL) ? 0 : comp->id;
#endif
        sk_SSL_CIPHER_free(s->session->ciphers);
        s->session->ciphers = ciphers;
        if (ciphers == NULL) {
            al = SSL_AD_INTERNAL_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, ERR_R_INTERNAL_ERROR);
            goto f_err;
        }
        ciphers = NULL;
        if (!tls1_set_server_sigalgs(s)) {
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_HELLO, SSL_R_CLIENTHELLO_TLSEXT);
            goto err;
        }
    }
 
    sk_SSL_CIPHER_free(ciphers);
    return MSG_PROCESS_CONTINUE_PROCESSING;
 f_err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
 err:
    ossl_statem_set_error(s);
 
    sk_SSL_CIPHER_free(ciphers);
    return MSG_PROCESS_ERROR;
 
}
 
WORK_STATE tls_post_process_client_hello(SSL *s, WORK_STATE wst)
{
    int al = SSL_AD_HANDSHAKE_FAILURE;
    const SSL_CIPHER *cipher;
 
    if (wst == WORK_MORE_A) {
        if (!s->hit) {
            /* Let cert callback update server certificates if required */
            if (s->cert->cert_cb) {
                int rv = s->cert->cert_cb(s, s->cert->cert_cb_arg);
                if (rv == 0) {
                    al = SSL_AD_INTERNAL_ERROR;
                    SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
                           SSL_R_CERT_CB_ERROR);
                    goto f_err;
                }
                if (rv < 0) {
                    s->rwstate = SSL_X509_LOOKUP;
                    return WORK_MORE_A;
                }
                s->rwstate = SSL_NOTHING;
            }
 
            cipher =
                ssl3_choose_cipher(s, s->session->ciphers, SSL_get_ciphers(s));
 
            if (cipher == NULL) {
                SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
                       SSL_R_NO_SHARED_CIPHER);
                goto f_err;
            }
            s->s3->tmp.new_cipher = cipher;
            /* check whether we should disable session resumption */
            if (s->not_resumable_session_cb != NULL)
                s->session->not_resumable = s->not_resumable_session_cb(s,
                    ((cipher->algorithm_mkey & (SSL_kDHE | SSL_kECDHE | SSL_kSM2DHE)) != 0));
            if (s->session->not_resumable)
                /* do not send a session ticket */
                s->tlsext_ticket_expected = 0;
        } else {
            /* Session-id reuse */
            s->s3->tmp.new_cipher = s->session->cipher;
        }
 
        if (!(s->verify_mode & SSL_VERIFY_PEER)) {
            if (!ssl3_digest_cached_records(s, 0)) {
                al = SSL_AD_INTERNAL_ERROR;
                goto f_err;
            }
        }
 
        /*-
         * we now have the following setup.
         * client_random
         * cipher_list          - our preferred list of ciphers
         * ciphers              - the clients preferred list of ciphers
         * compression          - basically ignored right now
         * ssl version is set   - sslv3
         * s->session           - The ssl session has been setup.
         * s->hit               - session reuse flag
         * s->s3->tmp.new_cipher- the new cipher to use.
         */
 
        /* Handles TLS extensions that we couldn't check earlier */
        if (s->version >= SSL3_VERSION) {
            if (!ssl_check_clienthello_tlsext_late(s, &al)) {
                SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
                       SSL_R_CLIENTHELLO_TLSEXT);
                goto f_err;
            }
        }
 
        wst = WORK_MORE_B;
    }
#ifndef OPENSSL_NO_SRP
    if (wst == WORK_MORE_B) {
        int ret;
        if ((ret = ssl_check_srp_ext_ClientHello(s, &al)) < 0) {
            /*
             * callback indicates further work to be done
             */
            s->rwstate = SSL_X509_LOOKUP;
            return WORK_MORE_B;
        }
        if (ret != SSL_ERROR_NONE) {
            /*
             * This is not really an error but the only means to for
             * a client to detect whether srp is supported.
             */
            if (al != TLS1_AD_UNKNOWN_PSK_IDENTITY)
                SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
                       SSL_R_CLIENTHELLO_TLSEXT);
            else
                SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_HELLO,
                       SSL_R_PSK_IDENTITY_NOT_FOUND);
            goto f_err;
        }
    }
#endif
    s->renegotiate = 2;
 
    return WORK_FINISHED_STOP;
 f_err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
    ossl_statem_set_error(s);
    return WORK_ERROR;
}
 
int tls_construct_server_hello(SSL *s)
{
    unsigned char *buf;
    unsigned char *p, *d;
    int i, sl;
    int al = 0;
    unsigned long l;
 
    buf = (unsigned char *)s->init_buf->data;
 
    /* Do the message type and length last */
    d = p = ssl_handshake_start(s);
 
    *(p++) = s->version >> 8;
    *(p++) = s->version & 0xff;
 
    /*
     * Random stuff. Filling of the server_random takes place in
     * tls_process_client_hello()
     */
    memcpy(p, s->s3->server_random, SSL3_RANDOM_SIZE);
    p += SSL3_RANDOM_SIZE;
 
    /*-
     * There are several cases for the session ID to send
     * back in the server hello:
     * - For session reuse from the session cache,
     *   we send back the old session ID.
     * - If stateless session reuse (using a session ticket)
     *   is successful, we send back the client's "session ID"
     *   (which doesn't actually identify the session).
     * - If it is a new session, we send back the new
     *   session ID.
     * - However, if we want the new session to be single-use,
     *   we send back a 0-length session ID.
     * s->hit is non-zero in either case of session reuse,
     * so the following won't overwrite an ID that we're supposed
     * to send back.
     */
    if (s->session->not_resumable ||
        (!(s->ctx->session_cache_mode & SSL_SESS_CACHE_SERVER)
         && !s->hit))
        s->session->session_id_length = 0;
 
    sl = s->session->session_id_length;
    if (sl > (int)sizeof(s->session->session_id)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
        ossl_statem_set_error(s);
        return 0;
    }
    *(p++) = sl;
    memcpy(p, s->session->session_id, sl);
    p += sl;
 
    /* put the cipher */
    i = ssl3_put_cipher_by_char(s->s3->tmp.new_cipher, p);
    p += i;
 
    /* put the compression method */
#ifdef OPENSSL_NO_COMP
    *(p++) = 0;
#else
    if (s->s3->tmp.new_compression == NULL)
        *(p++) = 0;
    else
        *(p++) = s->s3->tmp.new_compression->id;
#endif
 
    if (ssl_prepare_serverhello_tlsext(s) <= 0) {
        SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, SSL_R_SERVERHELLO_TLSEXT);
        ossl_statem_set_error(s);
        return 0;
    }
 
    if ((s->version != GMTLS_VERSION) && (p =
         ssl_add_serverhello_tlsext(s, p, buf + SSL3_RT_MAX_PLAIN_LENGTH,
                                    &al)) == NULL) {
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
        SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
        ossl_statem_set_error(s);
        return 0;
    }
 
    /* do the header */
    l = (p - d);
    if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_HELLO, l)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_HELLO, ERR_R_INTERNAL_ERROR);
        ossl_statem_set_error(s);
        return 0;
    }
 
    return 1;
}
 
int tls_construct_server_done(SSL *s)
{
    if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_DONE, 0)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_DONE, ERR_R_INTERNAL_ERROR);
        ossl_statem_set_error(s);
        return 0;
    }
 
    if (!s->s3->tmp.cert_request) {
        if (!ssl3_digest_cached_records(s, 0)) {
            ossl_statem_set_error(s);
        }
    }
 
    return 1;
}
 
int tls_construct_server_key_exchange(SSL *s)
{
#ifndef OPENSSL_NO_DH
    EVP_PKEY *pkdh = NULL;
    int j;
#endif
#ifndef OPENSSL_NO_EC
    unsigned char *encodedPoint = NULL;
    int encodedlen = 0;
    int curve_id = 0;
#endif
    EVP_PKEY *pkey;
    const EVP_MD *md = NULL;
    unsigned char *p, *d;
    int al, i;
    unsigned long type;
    int n;
    const BIGNUM *r[4];
    int nr[4], kn;
    BUF_MEM *buf;
    EVP_MD_CTX *md_ctx = NULL;
 
    if (!(md_ctx = EVP_MD_CTX_new())) {
        SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_MALLOC_FAILURE);
        al = SSL_AD_INTERNAL_ERROR;
        goto f_err;
    }
 
    type = s->s3->tmp.new_cipher->algorithm_mkey;
 
    buf = s->init_buf;
 
    r[0] = r[1] = r[2] = r[3] = NULL;
    n = 0;
#ifndef OPENSSL_NO_PSK
    if (type & SSL_PSK) {
        /*
         * reserve size for record length and PSK identity hint
         */
        n += 2;
        if (s->cert->psk_identity_hint)
            n += strlen(s->cert->psk_identity_hint);
    }
    /* Plain PSK or RSAPSK nothing to do */
    if (type & (SSL_kPSK | SSL_kRSAPSK)) {
    } else
#endif                          /* !OPENSSL_NO_PSK */
#ifndef OPENSSL_NO_DH
    if (type & (SSL_kDHE | SSL_kDHEPSK)) {
        CERT *cert = s->cert;
 
        EVP_PKEY *pkdhp = NULL;
        DH *dh;
 
        if (s->cert->dh_tmp_auto) {
            DH *dhp = ssl_get_auto_dh(s);
            pkdh = EVP_PKEY_new();
            if (pkdh == NULL || dhp == NULL) {
                DH_free(dhp);
                al = SSL_AD_INTERNAL_ERROR;
                SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
                       ERR_R_INTERNAL_ERROR);
                goto f_err;
            }
            EVP_PKEY_assign_DH(pkdh, dhp);
            pkdhp = pkdh;
        } else {
            pkdhp = cert->dh_tmp;
        }
        if ((pkdhp == NULL) && (s->cert->dh_tmp_cb != NULL)) {
            DH *dhp = s->cert->dh_tmp_cb(s, 0, 1024);
            pkdh = ssl_dh_to_pkey(dhp);
            if (pkdh == NULL) {
                al = SSL_AD_INTERNAL_ERROR;
                SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
                       ERR_R_INTERNAL_ERROR);
                goto f_err;
            }
            pkdhp = pkdh;
        }
        if (pkdhp == NULL) {
            al = SSL_AD_HANDSHAKE_FAILURE;
            SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
                   SSL_R_MISSING_TMP_DH_KEY);
            goto f_err;
        }
        if (!ssl_security(s, SSL_SECOP_TMP_DH,
                          EVP_PKEY_security_bits(pkdhp), 0, pkdhp)) {
            al = SSL_AD_HANDSHAKE_FAILURE;
            SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
                   SSL_R_DH_KEY_TOO_SMALL);
            goto f_err;
        }
        if (s->s3->tmp.pkey != NULL) {
            SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
                   ERR_R_INTERNAL_ERROR);
            goto err;
        }
 
        s->s3->tmp.pkey = ssl_generate_pkey(pkdhp);
 
        if (s->s3->tmp.pkey == NULL) {
            SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB);
            goto err;
        }
 
        dh = EVP_PKEY_get0_DH(s->s3->tmp.pkey);
 
        EVP_PKEY_free(pkdh);
        pkdh = NULL;
 
        DH_get0_pqg(dh, &r[0], NULL, &r[1]);
        DH_get0_key(dh, &r[2], NULL);
    } else
#endif
#ifndef OPENSSL_NO_EC
    if (type & (SSL_kECDHE | SSL_kECDHEPSK | SSL_kSM2DHE | SSL_kSM2PSK)) {
        int nid;
 
        if (s->s3->tmp.pkey != NULL) {
            SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
                   ERR_R_INTERNAL_ERROR);
            goto err;
        }
 
        /* Get NID of appropriate shared curve */
        nid = tls1_shared_curve(s, -2);
        curve_id = tls1_ec_nid2curve_id(nid);
        if (curve_id == 0) {
            SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
                   SSL_R_UNSUPPORTED_ELLIPTIC_CURVE);
            goto err;
        }
        s->s3->tmp.pkey = ssl_generate_pkey_curve(curve_id);
        /* Generate a new key for this curve */
        if (s->s3->tmp.pkey == NULL) {
            al = SSL_AD_INTERNAL_ERROR;
            SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EVP_LIB);
            goto f_err;
        }
 
        /* Encode the public key. */
        encodedlen = EVP_PKEY_get1_tls_encodedpoint(s->s3->tmp.pkey,
                                                    &encodedPoint);
        if (encodedlen == 0) {
            SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_EC_LIB);
            goto err;
        }
 
        /*
         * We only support named (not generic) curves in ECDH ephemeral key
         * exchanges. In this situation, we need four additional bytes to
         * encode the entire ServerECDHParams structure.
         */
        n += 4 + encodedlen;
 
        /*
         * We'll generate the serverKeyExchange message explicitly so we
         * can set these to NULLs
         */
        r[0] = NULL;
        r[1] = NULL;
        r[2] = NULL;
        r[3] = NULL;
    } else
#endif                          /* !OPENSSL_NO_EC */
#ifndef OPENSSL_NO_SRP
    if (type & SSL_kSRP) {
        if ((s->srp_ctx.N == NULL) ||
            (s->srp_ctx.g == NULL) ||
            (s->srp_ctx.s == NULL) || (s->srp_ctx.B == NULL)) {
            SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
                   SSL_R_MISSING_SRP_PARAM);
            goto err;
        }
        r[0] = s->srp_ctx.N;
        r[1] = s->srp_ctx.g;
        r[2] = s->srp_ctx.s;
        r[3] = s->srp_ctx.B;
    } else
#endif
    {
        al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
               SSL_R_UNKNOWN_KEY_EXCHANGE_TYPE);
        goto f_err;
    }
    for (i = 0; i < 4 && r[i] != NULL; i++) {
        nr[i] = BN_num_bytes(r[i]);
#ifndef OPENSSL_NO_SRP
        if ((i == 2) && (type & SSL_kSRP))
            n += 1 + nr[i];
        else
#endif
#ifndef OPENSSL_NO_DH
        /*-
         * for interoperability with some versions of the Microsoft TLS
         * stack, we need to zero pad the DHE pub key to the same length
         * as the prime, so use the length of the prime here
         */
        if ((i == 2) && (type & (SSL_kDHE | SSL_kDHEPSK)))
            n += 2 + nr[0];
        else
#endif
            n += 2 + nr[i];
    }
 
    if (!(s->s3->tmp.new_cipher->algorithm_auth & (SSL_aNULL | SSL_aSRP))
        && !(s->s3->tmp.new_cipher->algorithm_mkey & SSL_PSK)) {
        if ((pkey = ssl_get_sign_pkey(s, s->s3->tmp.new_cipher, &md))
            == NULL) {
            al = SSL_AD_DECODE_ERROR;
            goto f_err;
        }
        kn = EVP_PKEY_size(pkey);
        /* Allow space for signature algorithm */
        if (SSL_USE_SIGALGS(s))
            kn += 2;
        /* Allow space for signature length */
        kn += 2;
    } else {
        pkey = NULL;
        kn = 0;
    }
 
    if (!BUF_MEM_grow_clean(buf, n + SSL_HM_HEADER_LENGTH(s) + kn)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_BUF);
        goto err;
    }
    d = p = ssl_handshake_start(s);
 
#ifndef OPENSSL_NO_PSK
    if (type & SSL_PSK) {
        /* copy PSK identity hint */
        if (s->cert->psk_identity_hint) {
            size_t len = strlen(s->cert->psk_identity_hint);
            if (len > PSK_MAX_IDENTITY_LEN) {
                /*
                 * Should not happen - we already checked this when we set
                 * the identity hint
                 */
                SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
                       ERR_R_INTERNAL_ERROR);
                goto err;
            }
            s2n(len, p);
            memcpy(p, s->cert->psk_identity_hint, len);
            p += len;
        } else {
            s2n(0, p);
        }
    }
#endif
 
    for (i = 0; i < 4 && r[i] != NULL; i++) {
#ifndef OPENSSL_NO_SRP
        if ((i == 2) && (type & SSL_kSRP)) {
            *p = nr[i];
            p++;
        } else
#endif
#ifndef OPENSSL_NO_DH
        /*-
         * for interoperability with some versions of the Microsoft TLS
         * stack, we need to zero pad the DHE pub key to the same length
         * as the prime
         */
        if ((i == 2) && (type & (SSL_kDHE | SSL_kDHEPSK))) {
            s2n(nr[0], p);
            for (j = 0; j < (nr[0] - nr[2]); ++j) {
                *p = 0;
                ++p;
            }
        } else
#endif
            s2n(nr[i], p);
        BN_bn2bin(r[i], p);
        p += nr[i];
    }
 
#ifndef OPENSSL_NO_EC
    if (type & (SSL_kECDHE | SSL_kECDHEPSK | SSL_kSM2DHE | SSL_kSM2PSK)) {
        /*
         * XXX: For now, we only support named (not generic) curves. In
         * this situation, the serverKeyExchange message has: [1 byte
         * CurveType], [2 byte CurveName] [1 byte length of encoded
         * point], followed by the actual encoded point itself
         */
        *p = NAMED_CURVE_TYPE;
        p += 1;
        *p = 0;
        p += 1;
        *p = curve_id;
        p += 1;
        *p = encodedlen;
        p += 1;
        memcpy(p, encodedPoint, encodedlen);
        OPENSSL_free(encodedPoint);
        encodedPoint = NULL;
        p += encodedlen;
    }
#endif
 
    /* not anonymous */
    if (pkey != NULL) {
        /*
         * n is the length of the params, they start at &(d[4]) and p
         * points to the space at the end.
         */
        if (md) {
            /* send signature algorithm */
            if (SSL_USE_SIGALGS(s)) {
                if (!tls12_get_sigandhash(p, pkey, md)) {
                    /* Should never happen */
                    al = SSL_AD_INTERNAL_ERROR;
                    SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
                           ERR_R_INTERNAL_ERROR);
                    goto f_err;
                }
                p += 2;
            }
#ifdef SSL_DEBUG
            fprintf(stderr, "Using hash %s\n", EVP_MD_name(md));
#endif
 
            if (EVP_SignInit_ex(md_ctx, md, NULL) <= 0) {
                SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_EVP);
                al = SSL_AD_INTERNAL_ERROR;
                goto f_err;
            }
 
#ifndef OPENSSL_NO_SM2
            if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSM2) {
                unsigned char z[EVP_MAX_MD_SIZE];
                size_t zlen = sizeof(z);
                char *id = SM2_DEFAULT_ID;
                if (!SM2_compute_id_digest(md, id, strlen(id), z, &zlen,
                    EVP_PKEY_get0_EC_KEY(pkey))) {
                    SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_SM2);
                    al = SSL_AD_INTERNAL_ERROR;
                    goto f_err;
                }
                if (EVP_SignUpdate(md_ctx, z, zlen) <= 0) {
                    SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_SM2);
                    al = SSL_AD_INTERNAL_ERROR;
                    goto f_err;
                }
            }
#endif
 
            if (EVP_SignUpdate(md_ctx, &(s->s3->client_random[0]),
                               SSL3_RANDOM_SIZE) <= 0
                || EVP_SignUpdate(md_ctx, &(s->s3->server_random[0]),
                                  SSL3_RANDOM_SIZE) <= 0
                || EVP_SignUpdate(md_ctx, d, n) <= 0
                || EVP_SignFinal(md_ctx, &(p[2]),
                                 (unsigned int *)&i, pkey) <= 0) {
                SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_LIB_EVP);
                al = SSL_AD_INTERNAL_ERROR;
                goto f_err;
            }
            s2n(i, p);
            n += i + 2;
            if (SSL_USE_SIGALGS(s)) {
                n += 2;
            }
        } else {
            /* Is this error check actually needed? */
            al = SSL_AD_HANDSHAKE_FAILURE;
            SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE,
                   SSL_R_UNKNOWN_PKEY_TYPE);
            goto f_err;
        }
    }
 
    if (!ssl_set_handshake_header(s, SSL3_MT_SERVER_KEY_EXCHANGE, n)) {
        al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
        goto f_err;
    }
 
    EVP_MD_CTX_free(md_ctx);
    return 1;
 f_err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
 err:
#ifndef OPENSSL_NO_DH
    EVP_PKEY_free(pkdh);
#endif
#ifndef OPENSSL_NO_EC
    OPENSSL_free(encodedPoint);
#endif
    EVP_MD_CTX_free(md_ctx);
    ossl_statem_set_error(s);
    return 0;
}
 
int tls_construct_certificate_request(SSL *s)
{
    unsigned char *p, *d;
    int i, j, nl, off, n;
    STACK_OF(X509_NAME) *sk = NULL;
    X509_NAME *name;
    BUF_MEM *buf;
 
    buf = s->init_buf;
 
    d = p = ssl_handshake_start(s);
 
    /* get the list of acceptable cert types */
    p++;
    n = ssl3_get_req_cert_type(s, p);
    d[0] = n;
    p += n;
    n++;
 
    if (SSL_USE_SIGALGS(s)) {
        const unsigned char *psigs;
        unsigned char *etmp = p;
        nl = tls12_get_psigalgs(s, &psigs);
        /* Skip over length for now */
        p += 2;
        nl = tls12_copy_sigalgs(s, p, psigs, nl);
        /* Now fill in length */
        s2n(nl, etmp);
        p += nl;
        n += nl + 2;
    }
 
    off = n;
    p += 2;
    n += 2;
 
    sk = SSL_get_client_CA_list(s);
    nl = 0;
    if (sk != NULL) {
        for (i = 0; i < sk_X509_NAME_num(sk); i++) {
            name = sk_X509_NAME_value(sk, i);
            j = i2d_X509_NAME(name, NULL);
            if (!BUF_MEM_grow_clean(buf, SSL_HM_HEADER_LENGTH(s) + n + j + 2)) {
                SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_BUF_LIB);
                goto err;
            }
            p = ssl_handshake_start(s) + n;
            s2n(j, p);
            i2d_X509_NAME(name, &p);
            n += 2 + j;
            nl += 2 + j;
        }
    }
    /* else no CA names */
    p = ssl_handshake_start(s) + off;
    s2n(nl, p);
 
    if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_REQUEST, n)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_CERTIFICATE_REQUEST, ERR_R_INTERNAL_ERROR);
        goto err;
    }
 
    s->s3->tmp.cert_request = 1;
 
    return 1;
 err:
    ossl_statem_set_error(s);
    return 0;
}
 
static int tls_process_cke_psk_preamble(SSL *s, PACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_PSK
    unsigned char psk[PSK_MAX_PSK_LEN];
    size_t psklen;
    PACKET psk_identity;
 
    if (!PACKET_get_length_prefixed_2(pkt, &psk_identity)) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_LENGTH_MISMATCH);
        return 0;
    }
    if (PACKET_remaining(&psk_identity) > PSK_MAX_IDENTITY_LEN) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_DATA_LENGTH_TOO_LONG);
        return 0;
    }
    if (s->psk_server_callback == NULL) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, SSL_R_PSK_NO_SERVER_CB);
        return 0;
    }
 
    if (!PACKET_strndup(&psk_identity, &s->session->psk_identity)) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
        return 0;
    }
 
    psklen = s->psk_server_callback(s, s->session->psk_identity,
                                    psk, sizeof(psk));
 
    if (psklen > PSK_MAX_PSK_LEN) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
        return 0;
    } else if (psklen == 0) {
        /*
         * PSK related to the given identity not found
         */
        *al = SSL_AD_UNKNOWN_PSK_IDENTITY;
        SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE,
               SSL_R_PSK_IDENTITY_NOT_FOUND);
        return 0;
    }
 
    OPENSSL_free(s->s3->tmp.psk);
    s->s3->tmp.psk = OPENSSL_memdup(psk, psklen);
    OPENSSL_cleanse(psk, psklen);
 
    if (s->s3->tmp.psk == NULL) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_MALLOC_FAILURE);
        return 0;
    }
 
    s->s3->tmp.psklen = psklen;
 
    return 1;
#else
    /* Should never happen */
    *al = SSL_AD_INTERNAL_ERROR;
    SSLerr(SSL_F_TLS_PROCESS_CKE_PSK_PREAMBLE, ERR_R_INTERNAL_ERROR);
    return 0;
#endif
}
 
static int tls_process_cke_rsa(SSL *s, PACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_RSA
    unsigned char rand_premaster_secret[SSL_MAX_MASTER_KEY_LENGTH];
    int decrypt_len;
    unsigned char decrypt_good, version_good;
    size_t j, padding_len;
    PACKET enc_premaster;
    RSA *rsa = NULL;
    unsigned char *rsa_decrypt = NULL;
    int ret = 0;
 
    rsa = EVP_PKEY_get0_RSA(s->cert->pkeys[SSL_PKEY_RSA_ENC].privatekey);
    if (rsa == NULL) {
        *al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_MISSING_RSA_CERTIFICATE);
        return 0;
    }
 
    /* SSLv3 and pre-standard DTLS omit the length bytes. */
    if (s->version == SSL3_VERSION || s->version == DTLS1_BAD_VER) {
        enc_premaster = *pkt;
    } else {
        if (!PACKET_get_length_prefixed_2(pkt, &enc_premaster)
            || PACKET_remaining(pkt) != 0) {
            *al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_LENGTH_MISMATCH);
            return 0;
        }
    }
 
    /*
     * We want to be sure that the plaintext buffer size makes it safe to
     * iterate over the entire size of a premaster secret
     * (SSL_MAX_MASTER_KEY_LENGTH). Reject overly short RSA keys because
     * their ciphertext cannot accommodate a premaster secret anyway.
     */
    if (RSA_size(rsa) < SSL_MAX_MASTER_KEY_LENGTH) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, RSA_R_KEY_SIZE_TOO_SMALL);
        return 0;
    }
 
    rsa_decrypt = OPENSSL_malloc(RSA_size(rsa));
    if (rsa_decrypt == NULL) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_MALLOC_FAILURE);
        return 0;
    }
 
    /*
     * We must not leak whether a decryption failure occurs because of
     * Bleichenbacher's attack on PKCS #1 v1.5 RSA padding (see RFC 2246,
     * section 7.4.7.1). The code follows that advice of the TLS RFC and
     * generates a random premaster secret for the case that the decrypt
     * fails. See https://tools.ietf.org/html/rfc5246#section-7.4.7.1
     */
 
    if (RAND_bytes(rand_premaster_secret, sizeof(rand_premaster_secret)) <= 0)
        goto err;
 
    /*
     * Decrypt with no padding. PKCS#1 padding will be removed as part of
     * the timing-sensitive code below.
     */
    decrypt_len = RSA_private_decrypt(PACKET_remaining(&enc_premaster),
                                      PACKET_data(&enc_premaster),
                                      rsa_decrypt, rsa, RSA_NO_PADDING);
    if (decrypt_len < 0)
        goto err;
 
    /* Check the padding. See RFC 3447, section 7.2.2. */
 
    /*
     * The smallest padded premaster is 11 bytes of overhead. Small keys
     * are publicly invalid, so this may return immediately. This ensures
     * PS is at least 8 bytes.
     */
    if (decrypt_len < 11 + SSL_MAX_MASTER_KEY_LENGTH) {
        *al = SSL_AD_DECRYPT_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, SSL_R_DECRYPTION_FAILED);
        goto err;
    }
 
    padding_len = decrypt_len - SSL_MAX_MASTER_KEY_LENGTH;
    decrypt_good = constant_time_eq_int_8(rsa_decrypt[0], 0) &
        constant_time_eq_int_8(rsa_decrypt[1], 2);
    for (j = 2; j < padding_len - 1; j++) {
        decrypt_good &= ~constant_time_is_zero_8(rsa_decrypt[j]);
    }
    decrypt_good &= constant_time_is_zero_8(rsa_decrypt[padding_len - 1]);
 
    /*
     * If the version in the decrypted pre-master secret is correct then
     * version_good will be 0xff, otherwise it'll be zero. The
     * Klima-Pokorny-Rosa extension of Bleichenbacher's attack
     * (http://eprint.iacr.org/2003/052/) exploits the version number
     * check as a "bad version oracle". Thus version checks are done in
     * constant time and are treated like any other decryption error.
     */
    version_good =
        constant_time_eq_8(rsa_decrypt[padding_len],
                           (unsigned)(s->client_version >> 8));
    version_good &=
        constant_time_eq_8(rsa_decrypt[padding_len + 1],
                           (unsigned)(s->client_version & 0xff));
 
    /*
     * The premaster secret must contain the same version number as the
     * ClientHello to detect version rollback attacks (strangely, the
     * protocol does not offer such protection for DH ciphersuites).
     * However, buggy clients exist that send the negotiated protocol
     * version instead if the server does not support the requested
     * protocol version. If SSL_OP_TLS_ROLLBACK_BUG is set, tolerate such
     * clients.
     */
    if (s->options & SSL_OP_TLS_ROLLBACK_BUG) {
        unsigned char workaround_good;
        workaround_good = constant_time_eq_8(rsa_decrypt[padding_len],
                                             (unsigned)(s->version >> 8));
        workaround_good &=
            constant_time_eq_8(rsa_decrypt[padding_len + 1],
                               (unsigned)(s->version & 0xff));
        version_good |= workaround_good;
    }
 
    /*
     * Both decryption and version must be good for decrypt_good to
     * remain non-zero (0xff).
     */
    decrypt_good &= version_good;
 
    /*
     * Now copy rand_premaster_secret over from p using
     * decrypt_good_mask. If decryption failed, then p does not
     * contain valid plaintext, however, a check above guarantees
     * it is still sufficiently large to read from.
     */
    for (j = 0; j < sizeof(rand_premaster_secret); j++) {
        rsa_decrypt[padding_len + j] =
            constant_time_select_8(decrypt_good,
                                   rsa_decrypt[padding_len + j],
                                   rand_premaster_secret[j]);
    }
 
    if (!ssl_generate_master_secret(s, rsa_decrypt + padding_len,
                                    sizeof(rand_premaster_secret), 0)) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_INTERNAL_ERROR);
        goto err;
    }
 
    ret = 1;
 err:
    OPENSSL_free(rsa_decrypt);
    return ret;
#else
    /* Should never happen */
    *al = SSL_AD_INTERNAL_ERROR;
    SSLerr(SSL_F_TLS_PROCESS_CKE_RSA, ERR_R_INTERNAL_ERROR);
    return 0;
#endif
}
 
 
 
static int tls_process_cke_dhe(SSL *s, PACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_DH
    EVP_PKEY *skey = NULL;
    DH *cdh;
    unsigned int i;
    BIGNUM *pub_key;
    const unsigned char *data;
    EVP_PKEY *ckey = NULL;
    int ret = 0;
 
    if (!PACKET_get_net_2(pkt, &i) || PACKET_remaining(pkt) != i) {
        *al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_TLS_PROCESS_CKE_DHE,
               SSL_R_DH_PUBLIC_VALUE_LENGTH_IS_WRONG);
        goto err;
    }
    skey = s->s3->tmp.pkey;
    if (skey == NULL) {
        *al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_MISSING_TMP_DH_KEY);
        goto err;
    }
 
    if (PACKET_remaining(pkt) == 0L) {
        *al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_MISSING_TMP_DH_KEY);
        goto err;
    }
    if (!PACKET_get_bytes(pkt, &data, i)) {
        /* We already checked we have enough data */
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
        goto err;
    }
    ckey = EVP_PKEY_new();
    if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) == 0) {
        SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, SSL_R_BN_LIB);
        goto err;
    }
    cdh = EVP_PKEY_get0_DH(ckey);
    pub_key = BN_bin2bn(data, i, NULL);
 
    if (pub_key == NULL || !DH_set0_key(cdh, pub_key, NULL)) {
        SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
        if (pub_key != NULL)
            BN_free(pub_key);
        goto err;
    }
 
    if (ssl_derive(s, skey, ckey) == 0) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
        goto err;
    }
 
    ret = 1;
    EVP_PKEY_free(s->s3->tmp.pkey);
    s->s3->tmp.pkey = NULL;
 err:
    EVP_PKEY_free(ckey);
    return ret;
#else
    /* Should never happen */
    *al = SSL_AD_INTERNAL_ERROR;
    SSLerr(SSL_F_TLS_PROCESS_CKE_DHE, ERR_R_INTERNAL_ERROR);
    return 0;
#endif
}
 
static int tls_process_cke_ecdhe(SSL *s, PACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_EC
    EVP_PKEY *skey = s->s3->tmp.pkey;
    EVP_PKEY *ckey = NULL;
    int ret = 0;
 
    if (PACKET_remaining(pkt) == 0L) {
        /* We don't support ECDH client auth */
        *al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, SSL_R_MISSING_TMP_ECDH_KEY);
        goto err;
    } else {
        unsigned int i;
        const unsigned char *data;
 
 
 
        /*
         * Get client's public key from encoded point in the
         * ClientKeyExchange message.
         */
 
        /* Get encoded point length */
        if (!PACKET_get_1(pkt, &i) || !PACKET_get_bytes(pkt, &data, i)
            || PACKET_remaining(pkt) != 0) {
            *al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, SSL_R_LENGTH_MISMATCH);
            goto err;
        }
        ckey = EVP_PKEY_new();
        if (ckey == NULL || EVP_PKEY_copy_parameters(ckey, skey) <= 0) {
            SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_EVP_LIB);
            goto err;
        }
        if (EVP_PKEY_set1_tls_encodedpoint(ckey, data, i) == 0) {
            *al = SSL_AD_HANDSHAKE_FAILURE;
            SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_EC_LIB);
            goto err;
        }
    }
 
    if (ssl_derive(s, skey, ckey) == 0) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
        goto err;
    }
 
    ret = 1;
    EVP_PKEY_free(s->s3->tmp.pkey);
    s->s3->tmp.pkey = NULL;
 err:
    EVP_PKEY_free(ckey);
 
    return ret;
#else
    /* Should never happen */
    *al = SSL_AD_INTERNAL_ERROR;
    SSLerr(SSL_F_TLS_PROCESS_CKE_ECDHE, ERR_R_INTERNAL_ERROR);
    return 0;
#endif
}
 
static int tls_process_cke_srp(SSL *s, PACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_SRP
    unsigned int i;
    const unsigned char *data;
 
    if (!PACKET_get_net_2(pkt, &i)
        || !PACKET_get_bytes(pkt, &data, i)) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, SSL_R_BAD_SRP_A_LENGTH);
        return 0;
    }
    if ((s->srp_ctx.A = BN_bin2bn(data, i, NULL)) == NULL) {
        SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_BN_LIB);
        return 0;
    }
    if (BN_ucmp(s->srp_ctx.A, s->srp_ctx.N) >= 0 || BN_is_zero(s->srp_ctx.A)) {
        *al = SSL_AD_ILLEGAL_PARAMETER;
        SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, SSL_R_BAD_SRP_PARAMETERS);
        return 0;
    }
    OPENSSL_free(s->session->srp_username);
    s->session->srp_username = OPENSSL_strdup(s->srp_ctx.login);
    if (s->session->srp_username == NULL) {
        SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_MALLOC_FAILURE);
        return 0;
    }
 
    if (!srp_generate_server_master_secret(s)) {
        SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_INTERNAL_ERROR);
        return 0;
    }
 
    return 1;
#else
    /* Should never happen */
    *al = SSL_AD_INTERNAL_ERROR;
    SSLerr(SSL_F_TLS_PROCESS_CKE_SRP, ERR_R_INTERNAL_ERROR);
    return 0;
#endif
}
 
static int tls_process_cke_gost(SSL *s, PACKET *pkt, int *al)
{
#ifndef OPENSSL_NO_GOST
    EVP_PKEY_CTX *pkey_ctx;
    EVP_PKEY *client_pub_pkey = NULL, *pk = NULL;
    unsigned char premaster_secret[32];
    const unsigned char *start;
    size_t outlen = 32, inlen;
    unsigned long alg_a;
    int Ttag, Tclass;
    long Tlen;
    long sess_key_len;
    const unsigned char *data;
    int ret = 0;
 
    /* Get our certificate private key */
    alg_a = s->s3->tmp.new_cipher->algorithm_auth;
    if (alg_a & SSL_aGOST12) {
        /*
         * New GOST ciphersuites have SSL_aGOST01 bit too
         */
        pk = s->cert->pkeys[SSL_PKEY_GOST12_512].privatekey;
        if (pk == NULL) {
            pk = s->cert->pkeys[SSL_PKEY_GOST12_256].privatekey;
        }
        if (pk == NULL) {
            pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
        }
    } else if (alg_a & SSL_aGOST01) {
        pk = s->cert->pkeys[SSL_PKEY_GOST01].privatekey;
    }
 
    pkey_ctx = EVP_PKEY_CTX_new(pk, NULL);
    if (pkey_ctx == NULL) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_MALLOC_FAILURE);
        return 0;
    }
    if (EVP_PKEY_decrypt_init(pkey_ctx) <= 0) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
        return 0;
    }
    /*
     * If client certificate is present and is of the same type, maybe
     * use it for key exchange.  Don't mind errors from
     * EVP_PKEY_derive_set_peer, because it is completely valid to use a
     * client certificate for authorization only.
     */
    client_pub_pkey = X509_get0_pubkey(s->session->peer);
    if (client_pub_pkey) {
        if (EVP_PKEY_derive_set_peer(pkey_ctx, client_pub_pkey) <= 0)
            ERR_clear_error();
    }
    /* Decrypt session key */
    sess_key_len = PACKET_remaining(pkt);
    if (!PACKET_get_bytes(pkt, &data, sess_key_len)) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
        goto err;
    }
    if (ASN1_get_object((const unsigned char **)&data, &Tlen, &Ttag,
                        &Tclass, sess_key_len) != V_ASN1_CONSTRUCTED
        || Ttag != V_ASN1_SEQUENCE || Tclass != V_ASN1_UNIVERSAL) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, SSL_R_DECRYPTION_FAILED);
        goto err;
    }
    start = data;
    inlen = Tlen;
    if (EVP_PKEY_decrypt
        (pkey_ctx, premaster_secret, &outlen, start, inlen) <= 0) {
        *al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, SSL_R_DECRYPTION_FAILED);
        goto err;
    }
    /* Generate master secret */
    if (!ssl_generate_master_secret(s, premaster_secret,
                                    sizeof(premaster_secret), 0)) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
        goto err;
    }
    /* Check if pubkey from client certificate was used */
    if (EVP_PKEY_CTX_ctrl
        (pkey_ctx, -1, -1, EVP_PKEY_CTRL_PEER_KEY, 2, NULL) > 0)
        s->statem.no_cert_verify = 1;
 
    ret = 1;
 err:
    EVP_PKEY_CTX_free(pkey_ctx);
    return ret;
#else
    /* Should never happen */
    *al = SSL_AD_INTERNAL_ERROR;
    SSLerr(SSL_F_TLS_PROCESS_CKE_GOST, ERR_R_INTERNAL_ERROR);
    return 0;
#endif
}
 
MSG_PROCESS_RETURN tls_process_client_key_exchange(SSL *s, PACKET *pkt)
{
    int al = -1;
    unsigned long alg_k;
 
    alg_k = s->s3->tmp.new_cipher->algorithm_mkey;
 
    /* For PSK parse and retrieve identity, obtain PSK key */
    if ((alg_k & SSL_PSK) && !tls_process_cke_psk_preamble(s, pkt, &al))
        goto err;
 
    if (alg_k & SSL_kPSK) {
        /* Identity extracted earlier: should be nothing left */
        if (PACKET_remaining(pkt) != 0) {
            al = SSL_AD_HANDSHAKE_FAILURE;
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
                   SSL_R_LENGTH_MISMATCH);
            goto err;
        }
        /* PSK handled by ssl_generate_master_secret */
        if (!ssl_generate_master_secret(s, NULL, 0, 0)) {
            al = SSL_AD_INTERNAL_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE, ERR_R_INTERNAL_ERROR);
            goto err;
        }
    } else if (alg_k & (SSL_kRSA | SSL_kRSAPSK)) {
        if (!tls_process_cke_rsa(s, pkt, &al))
            goto err;
    } else if (alg_k & (SSL_kDHE | SSL_kDHEPSK)) {
        if (!tls_process_cke_dhe(s, pkt, &al))
            goto err;
    } else if (alg_k & (SSL_kECDHE | SSL_kECDHEPSK | SSL_kSM2DHE | SSL_kSM2PSK)) {
        if (!tls_process_cke_ecdhe(s, pkt, &al))
            goto err;
    } else if (alg_k & SSL_kSRP) {
        if (!tls_process_cke_srp(s, pkt, &al))
            goto err;
    } else if (alg_k & SSL_kGOST) {
        if (!tls_process_cke_gost(s, pkt, &al))
            goto err;
    } else {
        al = SSL_AD_HANDSHAKE_FAILURE;
        SSLerr(SSL_F_TLS_PROCESS_CLIENT_KEY_EXCHANGE,
               SSL_R_UNKNOWN_CIPHER_TYPE);
        goto err;
    }
 
    return MSG_PROCESS_CONTINUE_PROCESSING;
 err:
    if (al != -1)
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
#ifndef OPENSSL_NO_PSK
    OPENSSL_clear_free(s->s3->tmp.psk, s->s3->tmp.psklen);
    s->s3->tmp.psk = NULL;
#endif
    ossl_statem_set_error(s);
    return MSG_PROCESS_ERROR;
}
 
WORK_STATE tls_post_process_client_key_exchange(SSL *s, WORK_STATE wst)
{
#ifndef OPENSSL_NO_SCTP
    if (wst == WORK_MORE_A) {
        if (SSL_IS_DTLS(s)) {
            unsigned char sctpauthkey[64];
            char labelbuffer[sizeof(DTLS1_SCTP_AUTH_LABEL)];
            /*
             * Add new shared key for SCTP-Auth, will be ignored if no SCTP
             * used.
             */
            memcpy(labelbuffer, DTLS1_SCTP_AUTH_LABEL,
                   sizeof(DTLS1_SCTP_AUTH_LABEL));
 
            if (SSL_export_keying_material(s, sctpauthkey,
                                           sizeof(sctpauthkey), labelbuffer,
                                           sizeof(labelbuffer), NULL, 0,
                                           0) <= 0) {
                ossl_statem_set_error(s);
                return WORK_ERROR;;
            }
 
            BIO_ctrl(SSL_get_wbio(s), BIO_CTRL_DGRAM_SCTP_ADD_AUTH_KEY,
                     sizeof(sctpauthkey), sctpauthkey);
        }
        wst = WORK_MORE_B;
    }
 
    if ((wst == WORK_MORE_B)
        /* Is this SCTP? */
        && BIO_dgram_is_sctp(SSL_get_wbio(s))
        /* Are we renegotiating? */
        && s->renegotiate
        /* Are we going to skip the CertificateVerify? */
        && (s->session->peer == NULL || s->statem.no_cert_verify)
        && BIO_dgram_sctp_msg_waiting(SSL_get_rbio(s))) {
        s->s3->in_read_app_data = 2;
        s->rwstate = SSL_READING;
        BIO_clear_retry_flags(SSL_get_rbio(s));
        BIO_set_retry_read(SSL_get_rbio(s));
        ossl_statem_set_sctp_read_sock(s, 1);
        return WORK_MORE_B;
    } else {
        ossl_statem_set_sctp_read_sock(s, 0);
    }
#endif
 
    if (s->statem.no_cert_verify || !s->session->peer) {
        /*
         * No certificate verify or no peer certificate so we no longer need
         * the handshake_buffer
         */
        if (!ssl3_digest_cached_records(s, 0)) {
            ossl_statem_set_error(s);
            return WORK_ERROR;
        }
        return WORK_FINISHED_CONTINUE;
    } else {
        if (!s->s3->handshake_buffer) {
            SSLerr(SSL_F_TLS_POST_PROCESS_CLIENT_KEY_EXCHANGE,
                   ERR_R_INTERNAL_ERROR);
            ossl_statem_set_error(s);
            return WORK_ERROR;
        }
        /*
         * For sigalgs freeze the handshake buffer. If we support
         * extms we've done this already so this is a no-op
         */
        if (!ssl3_digest_cached_records(s, 1)) {
            ossl_statem_set_error(s);
            return WORK_ERROR;
        }
    }
 
    return WORK_FINISHED_CONTINUE;
}
 
MSG_PROCESS_RETURN tls_process_cert_verify(SSL *s, PACKET *pkt)
{
    EVP_PKEY *pkey = NULL;
    const unsigned char *sig, *data;
#ifndef OPENSSL_NO_GOST
    unsigned char *gost_data = NULL;
#endif
    int al, ret = MSG_PROCESS_ERROR;
    int type = 0, j;
    unsigned int len;
    X509 *peer;
    const EVP_MD *md = NULL;
    long hdatalen = 0;
    void *hdata;
 
    EVP_MD_CTX *mctx = EVP_MD_CTX_new();
 
    if (mctx == NULL) {
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE);
        al = SSL_AD_INTERNAL_ERROR;
        goto f_err;
    }
 
    peer = s->session->peer;
    pkey = X509_get0_pubkey(peer);
    type = X509_certificate_type(peer, pkey);
 
    if (!(type & EVP_PKT_SIGN)) {
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY,
               SSL_R_SIGNATURE_FOR_NON_SIGNING_CERTIFICATE);
        al = SSL_AD_ILLEGAL_PARAMETER;
        goto f_err;
    }
 
    /* Check for broken implementations of GOST ciphersuites */
    /*
     * If key is GOST and n is exactly 64, it is bare signature without
     * length field (CryptoPro implementations at least till CSP 4.0)
     */
#ifndef OPENSSL_NO_GOST
    if (PACKET_remaining(pkt) == 64
        && EVP_PKEY_id(pkey) == NID_id_GostR3410_2001) {
        len = 64;
    } else
#endif
    {
        if (SSL_USE_SIGALGS(s)) {
            int rv;
 
            if (!PACKET_get_bytes(pkt, &sig, 2)) {
                al = SSL_AD_DECODE_ERROR;
                goto f_err;
            }
            rv = tls12_check_peer_sigalg(&md, s, sig, pkey);
            if (rv == -1) {
                al = SSL_AD_INTERNAL_ERROR;
                goto f_err;
            } else if (rv == 0) {
                al = SSL_AD_DECODE_ERROR;
                goto f_err;
            }
#ifdef SSL_DEBUG
            fprintf(stderr, "USING TLSv1.2 HASH %s\n", EVP_MD_name(md));
#endif
        } else {
            /* Use default digest for this key type */
            int idx = ssl_cert_type(NULL, pkey);
            if (idx >= 0)
                md = s->s3->tmp.md[idx];
            if (md == NULL) {
                al = SSL_AD_INTERNAL_ERROR;
                goto f_err;
            }
        }
 
        if (!PACKET_get_net_2(pkt, &len)) {
            SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
            al = SSL_AD_DECODE_ERROR;
            goto f_err;
        }
    }
    j = EVP_PKEY_size(pkey);
    if (((int)len > j) || ((int)PACKET_remaining(pkt) > j)
        || (PACKET_remaining(pkt) == 0)) {
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_WRONG_SIGNATURE_SIZE);
        al = SSL_AD_DECODE_ERROR;
        goto f_err;
    }
    if (!PACKET_get_bytes(pkt, &data, len)) {
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_LENGTH_MISMATCH);
        al = SSL_AD_DECODE_ERROR;
        goto f_err;
    }
 
    hdatalen = BIO_get_mem_data(s->s3->handshake_buffer, &hdata);
    if (hdatalen <= 0) {
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_INTERNAL_ERROR);
        al = SSL_AD_INTERNAL_ERROR;
        goto f_err;
    }
 
//modify begin 使用gmtls 对从 client hello 消息到 client CertificateVerify 消息（不包括client CertificateVerify消息）所有内容做SM3摘要计算
#ifndef OPENSSL_NO_SM2
	EVP_MD_CTX *mctx1 = NULL;
	if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSM2)
	{
		// from client hello to client CertificateVerify(not include CertificateVerify) make sm3
		mctx1 = EVP_MD_CTX_new();
		if (mctx1 == NULL) {
			SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_MALLOC_FAILURE);
			goto f_err;
		}
		EVP_MD_CTX_init(mctx1);
		if (!EVP_DigestInit(mctx1, md)
		|| EVP_DigestUpdate(mctx1, (unsigned char *)hdata,
			hdatalen) <= 0
		|| EVP_DigestFinal_ex(mctx1, hdata, &hdatalen) <= 0)
		{
			SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_INTERNAL_ERROR);
			goto f_err;
		}
		*(unsigned char *)(hdata + hdatalen) = 0;
	}
	if (mctx1 != NULL)
		EVP_MD_CTX_free(mctx1);
#endif
// modify end
 
#ifdef SSL_DEBUG
    fprintf(stderr, "Using client verify alg %s\n", EVP_MD_name(md));
#endif
 
// modify begin 使用gmtls 从上面得到的SM3摘要结果，还需要使用 SM2_DEFAULT_ID（1234567812345678） 做内部哈希，再签名
	if (!EVP_VerifyInit_ex(mctx, md, NULL))
	{
		SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_EVP_LIB);
		goto f_err;
	}
 
#ifndef OPENSSL_NO_SM2
	if (s->s3->tmp.new_cipher->algorithm_auth & SSL_aSM2)
	{
		// SM2_DEFAULT_ID to assign, when compute CertificateVerify sign
		unsigned char z[EVP_MAX_MD_SIZE];
		size_t zlen;
		char *id = NULL;
		id = SM2_DEFAULT_ID;
		zlen = sizeof(z);
		if (!SM2_compute_id_digest(EVP_sm3(), id, strlen(id), z, &zlen,
			EVP_PKEY_get0_EC_KEY(pkey))) {
			SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_SM2_LIB);
			goto f_err;
		}
 
		if (!EVP_VerifyUpdate(mctx, z, zlen))
		{
			SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_EVP_LIB);
			goto f_err;
		}
	}
#endif
	if (!EVP_VerifyUpdate(mctx, hdata, hdatalen))
	{
		SSLerr(SSL_F_TLS_CONSTRUCT_CLIENT_VERIFY, ERR_R_EVP_LIB);
		goto f_err;
	}
// modify end
 
#ifndef OPENSSL_NO_GOST
    {
        int pktype = EVP_PKEY_id(pkey);
        if (pktype == NID_id_GostR3410_2001
            || pktype == NID_id_GostR3410_2012_256
            || pktype == NID_id_GostR3410_2012_512) {
            if ((gost_data = OPENSSL_malloc(len)) == NULL) {
                SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_MALLOC_FAILURE);
                al = SSL_AD_INTERNAL_ERROR;
                goto f_err;
            }
            BUF_reverse(gost_data, data, len);
            data = gost_data;
        }
    }
#endif
 
    if (s->version == SSL3_VERSION
        && !EVP_MD_CTX_ctrl(mctx, EVP_CTRL_SSL3_MASTER_SECRET,
                            s->session->master_key_length,
                            s->session->master_key)) {
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, ERR_R_EVP_LIB);
        al = SSL_AD_INTERNAL_ERROR;
        goto f_err;
    }
 
    if (EVP_VerifyFinal(mctx, data, len, pkey) <= 0) {
        al = SSL_AD_DECRYPT_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CERT_VERIFY, SSL_R_BAD_SIGNATURE);
        goto f_err;
    }
 
    ret = MSG_PROCESS_CONTINUE_PROCESSING;
    if (0) {
 f_err:
        ssl3_send_alert(s, SSL3_AL_FATAL, al);
        ossl_statem_set_error(s);
    }
    BIO_free(s->s3->handshake_buffer);
    s->s3->handshake_buffer = NULL;
    EVP_MD_CTX_free(mctx);
#ifndef OPENSSL_NO_GOST
    OPENSSL_free(gost_data);
#endif
    return ret;
}
 
MSG_PROCESS_RETURN tls_process_client_certificate(SSL *s, PACKET *pkt)
{
    int i, al = SSL_AD_INTERNAL_ERROR, ret = MSG_PROCESS_ERROR;
    X509 *x = NULL;
    unsigned long l, llen;
    const unsigned char *certstart, *certbytes;
    STACK_OF(X509) *sk = NULL;
    PACKET spkt;
 
    if ((sk = sk_X509_new_null()) == NULL) {
        SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
        goto f_err;
    }
 
    if (!PACKET_get_net_3(pkt, &llen)
        || !PACKET_get_sub_packet(pkt, &spkt, llen)
        || PACKET_remaining(pkt) != 0) {
        al = SSL_AD_DECODE_ERROR;
        SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, SSL_R_LENGTH_MISMATCH);
        goto f_err;
    }
 
    while (PACKET_remaining(&spkt) > 0) {
        if (!PACKET_get_net_3(&spkt, &l)
            || !PACKET_get_bytes(&spkt, &certbytes, l)) {
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
                   SSL_R_CERT_LENGTH_MISMATCH);
            goto f_err;
        }
 
        certstart = certbytes;
        x = d2i_X509(NULL, (const unsigned char **)&certbytes, l);
        if (x == NULL) {
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_ASN1_LIB);
            goto f_err;
        }
        if (certbytes != (certstart + l)) {
            al = SSL_AD_DECODE_ERROR;
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
                   SSL_R_CERT_LENGTH_MISMATCH);
            goto f_err;
        }
        if (!sk_X509_push(sk, x)) {
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, ERR_R_MALLOC_FAILURE);
            goto f_err;
        }
        x = NULL;
    }
 
    if (sk_X509_num(sk) <= 0) {
        /* TLS does not mind 0 certs returned */
        if (s->version == SSL3_VERSION) {
            al = SSL_AD_HANDSHAKE_FAILURE;
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
                   SSL_R_NO_CERTIFICATES_RETURNED);
            goto f_err;
        }
        /* Fail for TLS only if we required a certificate */
        else if ((s->verify_mode & SSL_VERIFY_PEER) &&
                 (s->verify_mode & SSL_VERIFY_FAIL_IF_NO_PEER_CERT)) {
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
                   SSL_R_PEER_DID_NOT_RETURN_A_CERTIFICATE);
            al = SSL_AD_HANDSHAKE_FAILURE;
            goto f_err;
        }
        /* No client certificate so digest cached records */
        if (s->s3->handshake_buffer && !ssl3_digest_cached_records(s, 0)) {
            goto f_err;
        }
    } else {
        EVP_PKEY *pkey;
        i = ssl_verify_cert_chain(s, sk);
        if (i <= 0) {
            al = ssl_verify_alarm_type(s->verify_result);
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
                   SSL_R_CERTIFICATE_VERIFY_FAILED);
            goto f_err;
        }
        if (i > 1) {
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE, i);
            al = SSL_AD_HANDSHAKE_FAILURE;
            goto f_err;
        }
        pkey = X509_get0_pubkey(sk_X509_value(sk, 0));
        if (pkey == NULL) {
            al = SSL3_AD_HANDSHAKE_FAILURE;
            SSLerr(SSL_F_TLS_PROCESS_CLIENT_CERTIFICATE,
                   SSL_R_UNKNOWN_CERTIFICATE_TYPE);
            goto f_err;
        }
    }
 
    X509_free(s->session->peer);
    s->session->peer = sk_X509_shift(sk);
    s->session->verify_result = s->verify_result;
 
    sk_X509_pop_free(s->session->peer_chain, X509_free);
    s->session->peer_chain = sk;
    /*
     * Inconsistency alert: cert_chain does *not* include the peer's own
     * certificate, while we do include it in statem_clnt.c
     */
    sk = NULL;
    ret = MSG_PROCESS_CONTINUE_READING;
    goto done;
 
 f_err:
    ssl3_send_alert(s, SSL3_AL_FATAL, al);
    ossl_statem_set_error(s);
 done:
    X509_free(x);
    sk_X509_pop_free(sk, X509_free);
    return ret;
}
 
int tls_construct_server_certificate(SSL *s)
{
    CERT_PKEY *cpk;
 
    cpk = ssl_get_server_send_pkey(s);
    if (cpk == NULL) {
        SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
        ossl_statem_set_error(s);
        return 0;
    }
 
    if (!ssl3_output_cert_chain(s, cpk)) {
        SSLerr(SSL_F_TLS_CONSTRUCT_SERVER_CERTIFICATE, ERR_R_INTERNAL_ERROR);
        ossl_statem_set_error(s);
        return 0;
    }
 
    return 1;
}
 
int tls_construct_new_session_ticket(SSL *s)
{
    unsigned char *senc = NULL;
    EVP_CIPHER_CTX *ctx = NULL;
    HMAC_CTX *hctx = NULL;
    unsigned char *p, *macstart;
    const unsigned char *const_p;
    int len, slen_full, slen;
    SSL_SESSION *sess;
    unsigned int hlen;
    SSL_CTX *tctx = s->initial_ctx;
    unsigned char iv[EVP_MAX_IV_LENGTH];
    unsigned char key_name[TLSEXT_KEYNAME_LENGTH];
    int iv_len;
 
    /* get session encoding length */
    slen_full = i2d_SSL_SESSION(s->session, NULL);
    /*
     * Some length values are 16 bits, so forget it if session is too
     * long
     */
    if (slen_full == 0 || slen_full > 0xFF00) {
        ossl_statem_set_error(s);
        return 0;
    }
    senc = OPENSSL_malloc(slen_full);
    if (senc == NULL) {
        ossl_statem_set_error(s);
        return 0;
    }
 
    ctx = EVP_CIPHER_CTX_new();
    hctx = HMAC_CTX_new();
    if (ctx == NULL || hctx == NULL) {
        SSLerr(SSL_F_TLS_CONSTRUCT_NEW_SESSION_TICKET, ERR_R_MALLOC_FAILURE);
        goto err;
    }
 
    p = senc;
    if (!i2d_SSL_SESSION(s->session, &p))
        goto err;
 
    /*
     * create a fresh copy (not shared with other threads) to clean up
     */
    const_p = senc;
    sess = d2i_SSL_SESSION(NULL, &const_p, slen_full);
    if (sess == NULL)
        goto err;
    sess->session_id_length = 0; /* ID is irrelevant for the ticket */
 
    slen = i2d_SSL_SESSION(sess, NULL);
    if (slen == 0 || slen > slen_full) { /* shouldn't ever happen */
        SSL_SESSION_free(sess);
        goto err;
    }
    p = senc;
    if (!i2d_SSL_SESSION(sess, &p)) {
        SSL_SESSION_free(sess);
        goto err;
    }
    SSL_SESSION_free(sess);
 
    /*-
     * Grow buffer if need be: the length calculation is as
     * follows handshake_header_length +
     * 4 (ticket lifetime hint) + 2 (ticket length) +
     * sizeof(keyname) + max_iv_len (iv length) +
     * max_enc_block_size (max encrypted session * length) +
     * max_md_size (HMAC) + session_length.
     */
    if (!BUF_MEM_grow(s->init_buf,
                      SSL_HM_HEADER_LENGTH(s) + 6 + sizeof(key_name) +
                      EVP_MAX_IV_LENGTH + EVP_MAX_BLOCK_LENGTH +
                      EVP_MAX_MD_SIZE + slen))
        goto err;
 
    p = ssl_handshake_start(s);
    /*
     * Initialize HMAC and cipher contexts. If callback present it does
     * all the work otherwise use generated values from parent ctx.
     */
    if (tctx->tlsext_ticket_key_cb) {
        /* if 0 is returned, write an empty ticket */
        int ret = tctx->tlsext_ticket_key_cb(s, key_name, iv, ctx,
                                             hctx, 1);
 
        if (ret == 0) {
            l2n(0, p);          /* timeout */
            s2n(0, p);          /* length */
            if (!ssl_set_handshake_header
                (s, SSL3_MT_NEWSESSION_TICKET, p - ssl_handshake_start(s)))
                goto err;
            OPENSSL_free(senc);
            EVP_CIPHER_CTX_free(ctx);
            HMAC_CTX_free(hctx);
            return 1;
        }
        if (ret < 0)
            goto err;
        iv_len = EVP_CIPHER_CTX_iv_length(ctx);
    } else {
        const EVP_CIPHER *cipher =
#ifndef OPENSSL_NO_AES
		EVP_aes_256_cbc();
#else
		EVP_sms4_cbc();
#endif
										
 
        iv_len = EVP_CIPHER_iv_length(cipher);
        if (RAND_bytes(iv, iv_len) <= 0)
            goto err;
        if (!EVP_EncryptInit_ex(ctx, cipher, NULL,
                                tctx->tlsext_tick_aes_key, iv))
            goto err;
        if (!HMAC_Init_ex(hctx, tctx->tlsext_tick_hmac_key,
                          sizeof(tctx->tlsext_tick_hmac_key),
                          EVP_get_digestbynid(NID_sha256), NULL))
            goto err;
        memcpy(key_name, tctx->tlsext_tick_key_name,
               sizeof(tctx->tlsext_tick_key_name));
    }
 
    /*
     * Ticket lifetime hint (advisory only): We leave this unspecified
     * for resumed session (for simplicity), and guess that tickets for
     * new sessions will live as long as their sessions.
     */
    l2n(s->hit ? 0 : s->session->timeout, p);
 
    /* Skip ticket length for now */
    p += 2;
    /* Output key name */
    macstart = p;
    memcpy(p, key_name, sizeof(key_name));
    p += sizeof(key_name);
    /* output IV */
    memcpy(p, iv, iv_len);
    p += iv_len;
    /* Encrypt session data */
    if (!EVP_EncryptUpdate(ctx, p, &len, senc, slen))
        goto err;
    p += len;
    if (!EVP_EncryptFinal(ctx, p, &len))
        goto err;
    p += len;
 
    if (!HMAC_Update(hctx, macstart, p - macstart))
        goto err;
    if (!HMAC_Final(hctx, p, &hlen))
        goto err;
 
    EVP_CIPHER_CTX_free(ctx);
    HMAC_CTX_free(hctx);
    ctx = NULL;
    hctx = NULL;
 
    p += hlen;
    /* Now write out lengths: p points to end of data written */
    /* Total length */
    len = p - ssl_handshake_start(s);
    /* Skip ticket lifetime hint */
    p = ssl_handshake_start(s) + 4;
    s2n(len - 6, p);
    if (!ssl_set_handshake_header(s, SSL3_MT_NEWSESSION_TICKET, len))
        goto err;
    OPENSSL_free(senc);
 
    return 1;
 err:
    OPENSSL_free(senc);
    EVP_CIPHER_CTX_free(ctx);
    HMAC_CTX_free(hctx);
    ossl_statem_set_error(s);
    return 0;
}
 
int tls_construct_cert_status(SSL *s)
{
    unsigned char *p;
    size_t msglen;
 
    /*-
     * Grow buffer if need be: the length calculation is as
     * follows handshake_header_length +
     * 1 (ocsp response type) + 3 (ocsp response length)
     * + (ocsp response)
     */
    msglen = 4 + s->tlsext_ocsp_resplen;
    if (!BUF_MEM_grow(s->init_buf, SSL_HM_HEADER_LENGTH(s) + msglen))
        goto err;
 
    p = ssl_handshake_start(s);
 
    /* status type */
    *(p++) = s->tlsext_status_type;
    /* length of OCSP response */
    l2n3(s->tlsext_ocsp_resplen, p);
    /* actual response */
    memcpy(p, s->tlsext_ocsp_resp, s->tlsext_ocsp_resplen);
 
    if (!ssl_set_handshake_header(s, SSL3_MT_CERTIFICATE_STATUS, msglen))
        goto err;
 
    return 1;
 
 err:
    ossl_statem_set_error(s);
    return 0;
}
 
#ifndef OPENSSL_NO_NEXTPROTONEG
/*
 * tls_process_next_proto reads a Next Protocol Negotiation handshake message.
 * It sets the next_proto member in s if found
 */
MSG_PROCESS_RETURN tls_process_next_proto(SSL *s, PACKET *pkt)
{
    PACKET next_proto, padding;
    size_t next_proto_len;
 
    /*-
     * The payload looks like:
     *   uint8 proto_len;
     *   uint8 proto[proto_len];
     *   uint8 padding_len;
     *   uint8 padding[padding_len];
     */
    if (!PACKET_get_length_prefixed_1(pkt, &next_proto)
        || !PACKET_get_length_prefixed_1(pkt, &padding)
        || PACKET_remaining(pkt) > 0) {
        SSLerr(SSL_F_TLS_PROCESS_NEXT_PROTO, SSL_R_LENGTH_MISMATCH);
        goto err;
    }
 
    if (!PACKET_memdup(&next_proto, &s->next_proto_negotiated, &next_proto_len)) {
        s->next_proto_negotiated_len = 0;
        goto err;
    }
 
    s->next_proto_negotiated_len = (unsigned char)next_proto_len;
 
    return MSG_PROCESS_CONTINUE_READING;
 err:
    ossl_statem_set_error(s);
    return MSG_PROCESS_ERROR;
}
#endif
 
#define SSLV2_CIPHER_LEN    3
 
STACK_OF(SSL_CIPHER) *ssl_bytes_to_cipher_list(SSL *s,
                                               PACKET *cipher_suites,
                                               STACK_OF(SSL_CIPHER) **skp,
                                               int sslv2format, int *al)
{
    const SSL_CIPHER *c;
    STACK_OF(SSL_CIPHER) *sk;
    int n;
    /* 3 = SSLV2_CIPHER_LEN > TLS_CIPHER_LEN = 2. */
    unsigned char cipher[SSLV2_CIPHER_LEN];
 
    s->s3->send_connection_binding = 0;
 
    n = sslv2format ? SSLV2_CIPHER_LEN : TLS_CIPHER_LEN;
 
    if (PACKET_remaining(cipher_suites) == 0) {
        SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, SSL_R_NO_CIPHERS_SPECIFIED);
        *al = SSL_AD_ILLEGAL_PARAMETER;
        return NULL;
    }
 
    if (PACKET_remaining(cipher_suites) % n != 0) {
        SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
               SSL_R_ERROR_IN_RECEIVED_CIPHER_LIST);
        *al = SSL_AD_DECODE_ERROR;
        return NULL;
    }
 
    sk = sk_SSL_CIPHER_new_null();
    if (sk == NULL) {
        SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
        *al = SSL_AD_INTERNAL_ERROR;
        return NULL;
    }
 
    if (sslv2format) {
        size_t numciphers = PACKET_remaining(cipher_suites) / n;
        PACKET sslv2ciphers = *cipher_suites;
        unsigned int leadbyte;
        unsigned char *raw;
 
        /*
         * We store the raw ciphers list in SSLv3+ format so we need to do some
         * preprocessing to convert the list first. If there are any SSLv2 only
         * ciphersuites with a non-zero leading byte then we are going to
         * slightly over allocate because we won't store those. But that isn't a
         * problem.
         */
        raw = OPENSSL_malloc(numciphers * TLS_CIPHER_LEN);
        s->s3->tmp.ciphers_raw = raw;
        if (raw == NULL) {
            *al = SSL_AD_INTERNAL_ERROR;
            goto err;
        }
        for (s->s3->tmp.ciphers_rawlen = 0;
             PACKET_remaining(&sslv2ciphers) > 0;
             raw += TLS_CIPHER_LEN) {
            if (!PACKET_get_1(&sslv2ciphers, &leadbyte)
                    || (leadbyte == 0
                        && !PACKET_copy_bytes(&sslv2ciphers, raw,
                                              TLS_CIPHER_LEN))
                    || (leadbyte != 0
                        && !PACKET_forward(&sslv2ciphers, TLS_CIPHER_LEN))) {
                *al = SSL_AD_INTERNAL_ERROR;
                OPENSSL_free(raw);
                s->s3->tmp.ciphers_raw = NULL;
                s->s3->tmp.ciphers_rawlen = 0;
                goto err;
            }
            if (leadbyte == 0)
                s->s3->tmp.ciphers_rawlen += TLS_CIPHER_LEN;
        }
    } else if (!PACKET_memdup(cipher_suites, &s->s3->tmp.ciphers_raw,
                           &s->s3->tmp.ciphers_rawlen)) {
        *al = SSL_AD_INTERNAL_ERROR;
        goto err;
    }
 
    while (PACKET_copy_bytes(cipher_suites, cipher, n)) {
        /*
         * SSLv3 ciphers wrapped in an SSLv2-compatible ClientHello have the
         * first byte set to zero, while true SSLv2 ciphers have a non-zero
         * first byte. We don't support any true SSLv2 ciphers, so skip them.
         */
        if (sslv2format && cipher[0] != '\0')
            continue;
 
        /* Check for TLS_EMPTY_RENEGOTIATION_INFO_SCSV */
        if ((cipher[n - 2] == ((SSL3_CK_SCSV >> 8) & 0xff)) &&
            (cipher[n - 1] == (SSL3_CK_SCSV & 0xff))) {
            /* SCSV fatal if renegotiating */
            if (s->renegotiate) {
                SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
                       SSL_R_SCSV_RECEIVED_WHEN_RENEGOTIATING);
                *al = SSL_AD_HANDSHAKE_FAILURE;
                goto err;
            }
            s->s3->send_connection_binding = 1;
            continue;
        }
 
        /* Check for TLS_FALLBACK_SCSV */
        if ((cipher[n - 2] == ((SSL3_CK_FALLBACK_SCSV >> 8) & 0xff)) &&
            (cipher[n - 1] == (SSL3_CK_FALLBACK_SCSV & 0xff))) {
            /*
             * The SCSV indicates that the client previously tried a higher
             * version. Fail if the current version is an unexpected
             * downgrade.
             */
            if (!ssl_check_version_downgrade(s)) {
                SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST,
                       SSL_R_INAPPROPRIATE_FALLBACK);
                *al = SSL_AD_INAPPROPRIATE_FALLBACK;
                goto err;
            }
            continue;
        }
 
        /* For SSLv2-compat, ignore leading 0-byte. */
        c = ssl_get_cipher_by_char(s, sslv2format ? &cipher[1] : cipher);
        if (c != NULL) {
            if (!sk_SSL_CIPHER_push(sk, c)) {
                SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_MALLOC_FAILURE);
                *al = SSL_AD_INTERNAL_ERROR;
                goto err;
            }
        }
    }
    if (PACKET_remaining(cipher_suites) > 0) {
        *al = SSL_AD_INTERNAL_ERROR;
        SSLerr(SSL_F_SSL_BYTES_TO_CIPHER_LIST, ERR_R_INTERNAL_ERROR);
        goto err;
    }
 
    *skp = sk;
    return sk;
 err:
    sk_SSL_CIPHER_free(sk);
    return NULL;
}

重新编译

• sudo  ./config --prefix=/usr/local/gmssl --openssldir=/usr/local/gmssl
• sudo make
• sudo make install
• 配置 /etc/profile
• 激活 source /etc/profile
• 验证 gmssl version
   

成果展示

吉大正元身份认证网关和gmssl客户端之间通信

• gmssl 客户端命令
• gmssl s_client -gmtls -connect 192.168.80.110:8889 -key /home/chy-cpabe/tmp/second/sign.key -cert /home/chy-cpabe/tmp/second/sign.pem -dkey /home/chy-cpabe/tmp/second/encrypt.key -dcert /home/chy-cpabe/tmp/second/encrypt.pem -CAfile /home/chy-cpabe/tmp/second/rootcert.pem -state -verify 3
• -gmtls    协议类型
• -connect 对接端口  其中192.168.80.110:8889 是身份认证网关的地址
• -key       签名私钥
• -cert       签名证书
• -dkey      加密私钥
• -dcert      加密证书
• -CAfile    CA证书路径
• -state     状态信息
• -verify     开启国密双证书双向认证
• 1             验证深度，分析源码可知，这个数只是接收并输出，并无关键性影响

chy-cpabe@ubuntu:~$ gmssl s_client -gmtls -connect 192.168.80.110:8889 -key /home/chy-cpabe/tmp/second/sign.key -cert /home/chy-cpabe/tmp/second/sign.pem -dkey /home/chy-cpabe/tmp/second/encrypt.key -dcert /home/chy-cpabe/tmp/second/encrypt.pem -CAfile /home/chy-cpabe/tmp/second/rootcert.pem -state -verify 3
verify depth is 3
[GMTLS_DEBUG] set sm2 signing certificate
[GMTLS_DEBUG] set sm2 signing private key
[GMTLS_DEBUG] set sm2 encryption certificate
[GMTLS_DEBUG] set sm2 decryption private key
CONNECTED(00000003)
SSL_connect:before SSL initialization
SSL_connect:SSLv3/TLS write client hello
SSL_connect:SSLv3/TLS write client hello
SSL_connect:SSLv3/TLS read server hello
depth=1 C = CN, O = SDT, CN = SDTCA SM2
verify return:1
depth=0 C = CN, O = SDT, CN = 192.168.80.110
verify return:1
SSL_connect:SSLv3/TLS read server certificate
Z=57A18ADE9AE65C4518E01851C91150B786FEC8CD4FA1C22DCA623E2D1C4B494D
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
SSL_connect:SSLv3/TLS read server key exchange
SSL_connect:SSLv3/TLS read server certificate request
SSL_connect:SSLv3/TLS read server done
SSL_connect:SSLv3/TLS write client certificate
SSL_connect:SSLv3/TLS write client key exchange
ssl_get_algorithm2=b9cdb00008x
SSL_connect:SSLv3/TLS write certificate verify
SSL_connect:SSLv3/TLS write change cipher spec
SSL_connect:SSLv3/TLS write finished
SSL_connect:SSLv3/TLS write finished
SSL_connect:SSLv3/TLS read change cipher spec
SSL_connect:SSLv3/TLS read finished
---
Certificate chain
 0 s:/C=CN/O=SDT/CN=192.168.80.110
   i:/C=CN/O=SDT/CN=SDTCA SM2
 1 s:/C=CN/O=SDT/CN=192.168.80.110
   i:/C=CN/O=SDT/CN=SDTCA SM2
---
Server certificate
-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
subject=/C=CN/O=SDT/CN=192.168.80.110
issuer=/C=CN/O=SDT/CN=SDTCA SM2
---
Acceptable client certificate CA names
/C=CN/O=SDT/CN=SDTCA SM2
Client Certificate Types: RSA sign, ECDSA sign
---
SSL handshake has read 1238 bytes and written 1773 bytes
Verification: OK
---
New, GMTLSv1.1, Cipher is SM2-WITH-SMS4-SM3
Server public key is 256 bit
Secure Renegotiation IS NOT supported
Compression: NONE
Expansion: NONE
No ALPN negotiated
SSL-Session:
    Protocol  : GMTLSv1.1
    Cipher    : SM2-WITH-SMS4-SM3
    Session-ID: 
    Session-ID-ctx: 
    Master-Key: 83AEC9F0773CE4364F070F44FCCFFAF4AA6C09090AC71009D67F03313553DABD8E36C4E0AE61CD876B2ED2095EC9A905
    PSK identity: None
    PSK identity hint: None
    SRP username: None
    Start Time: 1668134562
    Timeout   : 7200 (sec)
    Verify return code: 0 (ok)
    Extended master secret: no
---
SSL3 alert read:warning:close notify
closed
SSL3 alert write:warning:close notify

吉大正元USBKey和gmssl服务端之间通信

• 吉大正元USBKey

•  gmssl服务端

•  抓包测试

参考链接

• 双向gmtls测试，服务端验证certificate verify 消息失败 · Issue #1160 · guanzhi/GmSSL · GitHub