OpenSsl客户端生成证书请求，秘钥对的方法_openssl genrsa -out private.pem 2048

OpenSsl客户端生成证书请求，秘钥对的方法

1、创建私钥

openssl genrsa -out private.pem 2048
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密钥长度，2048

2、创建公钥

openssl rsa -in private.pem -pubout -out public.pem
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3、创建证书请求

openssl req -new -key private.pem -config myServer.cnf -out certReq.csr 
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使用私钥生成一个证书请求certReq.csr，证书请求是用来做数据传输提交给CA证书中心，然后生成证书的。

该证书请求是一个PKCS#10文件。

myServer.cnf配置的是默认的请求参数，如果不配置指定这个文件，就使用系统默认的。

myServer.cnf如下:

[ req ]
default_bits       = 2048
default_keyfile    = proxykey.pem
distinguished_name = req_distinguished_name
encrypt_rsa_key    = no
default_md         = sha256
req_extensions     = req_ext

[ req_distinguished_name ]
countryName         = Country Name \"C\" (2 letter code)
countryName_default = CN 

stateOrProvinceName         = State Name \"ST\" (full name)
stateOrProvinceName_default = GuangDong

localityName         = Locality Name \"L\" (eg, city)
localityName_default = GuangZhou

organizationName         = Organization Name \"O\" (eg, company)
organizationName_default = ShiJu

organizationalUnitName         = Organizational Unit Name \"OU\" (eg, section)
organizationalUnitName_default = Test

0.commonName         = Common Name \"CN\" (eg, YOUR name)
0.commonName_default =

emailAddress         = Email Address
emailAddress_default = test@example.com

1.commonName         = Common Name \"CN\" (unique name)
1.commonName_default = 192.168.6.243


[ proxy_cert_ext ]
keyUsage=digitalSignature,keyEncipherment,dataEncipherment
basicConstraints=CA:FALSE
subjectKeyIdentifier=hash
authorityKeyIdentifier=keyid,issuer
#proxyCertInfo=critical,language:id-ppl-inheritAll
proxyCertInfo=critical,language:id-ppl-anyLanguage,pathlen:1,policy:text:ABCD

[ req_ext ]
subjectAltName = @alt_names

[ alt_names ]
DNS.1 = test.example.com
DNS.2 = test.exmaple.net
IP = 192.168.6.243
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4、查看请求详细内容

openssl req -in certReq.csr -text
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内容解释如下

Certificate Request:                                            # 此为证书请求文件头
    Data:
        Version: 0 (0x0)
        Subject: C=CN, ST=GD, O=DX                              # 此为提供的个人信息，注意左侧标头为"Subject"，这是很重要的一项
        Subject Public Key Info:                                 
            Public Key Algorithm: rsaEncryption                 # 使用的公钥算法
                Public-Key: (2048 bit)                          # 公钥的长度
                Modulus:
                    00:ed:66:43:30:45:3c:c7:a6:4e:49:8c:d3:49:67:
                    1d:73:7d:c1:e2:32:8c:69:0b:d2:84:8d:22:03:75:
                    47:e6:a6:7a:6b:67:a7:ea:b7:c0:52:43:60:fb:61:
                    ec:3d:39:8f:2b:c9:fd:d8:c5:53:b8:22:42:6c:04:
                    a8:57:5e:62:a1:42:90:69:65:f8:a6:ea:f9:db:c8:
                    6b:a3:cc:35:10:31:b1:8e:c4:01:d9:5e:b2:ce:3d:
                    2f:c8:16:e4:8f:6e:07:ae:79:42:46:65:8f:5b:2e:
                    f4:d3:29:a9:ff:6e:8c:ff:95:c6:14:80:fa:6a:5d:
                    01:24:18:5f:2b:87:07:e2:5b:58:8b:01:53:ef:ef:
                    bf:0b:fb:19:c1:fa:56:3e:8a:12:04:10:88:d5:07:
                    4d:6e:ad:e3:41:e6:c3:e0:d0:da:47:6a:90:73:a8:
                    4d:a7:e9:52:51:61:29:cb:c2:eb:76:a8:70:02:d7:
                    2f:4a:35:6d:fe:22:a9:ae:da:2b:d1:c4:a1:35:ff:
                    3f:04:d8:8a:e6:42:b4:49:46:9e:e2:ee:72:08:8b:
                    6e:1d:22:d1:67:82:dd:a8:eb:89:6c:03:a1:bd:16:
                    49:3a:b2:cb:fc:b4:a3:18:1d:0f:ce:45:b9:4c:b3:
                    2e:bb:16:08:83:11:1a:0b:e8:13:21:a6:16:06:ad:
                    a9:39
                Exponent: 65537 (0x10001)
        Attributes:
            a0:00
    Signature Algorithm: sha256WithRSAEncryption                 # 为请求文件数字签名时使用的算法
         50:09:53:fa:f4:d3:95:e8:5b:df:6f:44:f2:24:94:d3:49:6f:
         16:35:d5:a1:cf:53:1c:33:8c:8e:aa:b4:37:e0:1d:e6:92:7d:
         77:71:a8:80:3c:18:b5:ac:cb:f0:cc:c8:10:e4:c3:dc:a2:09:
         5d:ea:62:e5:0d:98:55:6a:43:5e:74:48:d8:13:15:38:05:6b:
         56:ae:22:0a:d5:d3:e2:42:ca:e4:67:fa:5b:43:65:80:7a:0d:
         1f:7b:e2:80:05:a5:df:6d:a6:59:c2:86:8b:c3:99:30:e3:77:
         c2:2e:6b:25:3a:88:07:df:9a:7b:ca:d2:d2:26:dd:a4:80:ab:
         cc:66:81:49:73:87:fc:e0:1a:9f:5f:92:e8:b5:01:45:e3:f0:
         06:51:09:f3:73:64:af:87:fe:96:95:d5:24:fe:fb:bd:2a:9d:
         58:65:30:f1:45:ad:b2:74:9c:b3:b8:5a:dd:1b:1c:bd:70:3f:
         5f:88:d3:5b:1e:cd:49:04:a9:48:e7:44:36:0a:c1:75:9c:15:
         66:b6:fd:00:ef:ff:3e:9e:83:bf:7d:16:67:4a:f7:f5:1c:c3:
         51:6c:50:21:a3:1b:bd:83:c0:0d:24:d7:a8:4b:d4:38:c2:aa:
         96:ae:0e:a8:3e:0e:af:5a:16:96:93:8d:9c:36:80:3d:8a:fe:
         fc:e7:83:00
-----BEGIN CERTIFICATE REQUEST-----                             # 公钥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-----END CERTIFICATE REQUEST-----

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5、查看公钥

openssl req -in certReq.csr
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6、验证请求文件是否被串改过

openssl req -verify -in certReq.csr -noout
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7、自签署证书，可用于自建根CA时

openssl req -x509 -key private.pem -in certReq.csr -out CARoot.cer -days 365
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这里只是模拟自建证书，实际证书自建还是由于CA颁发

证书扩展名可以是.cer/.crt/.rsa

8、查看证书

cat CARoot.cer
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证书内容如下，是经过编码的数据

-----BEGIN CERTIFICATE-----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-----END CERTIFICATE-----
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9、命名

注意：
上面的内容不同类型的DN的取值和编排会有所不同，所以只是作为一个参考。