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OpenSSL中对称加密算法DES常用函数使用举例_openssl/des.h

作者：小蓝xlanll | 2024-03-25 08:49:50

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openssl/des.h

主要包括3个文件：

  1. cryptotest.h:
#ifndef _CRYPTOTEST_H_
#define _CRYPTOTEST_H_
 
#include <string>
 
using namespace std;
 
typedef enum {
	GENERAL = 0,
	ECB,
	CBC,
	CFB,
	OFB,
	TRIPLE_ECB,
	TRIPLE_CBC
}CRYPTO_MODE;
 
string DES_Encrypt(const string cleartext, const string key, CRYPTO_MODE mode);
string DES_Decrypt(const string ciphertext, const string key, CRYPTO_MODE mode);
 
#endif //_CRYPTOTEST_H_

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  1. destest.cpp
#include <iostream>
#include <string>
#include <vector>
#include <openssl/des.h>
#include "cryptotest.h"
 
using namespace std;
 
static unsigned char cbc_iv[8] = {'0', '1', 'A', 'B', 'a', 'b', '9', '8'};
 
string DES_Encrypt(const string cleartext, const string key, CRYPTO_MODE mode)
{
	string strCipherText;
 
	switch (mode) {
	case GENERAL:
	case ECB:
		{
			DES_cblock keyEncrypt;
			memset(keyEncrypt, 0, 8);
 
			if (key.length() <= 8) 
				memcpy(keyEncrypt, key.c_str(), key.length());
			else 
				memcpy(keyEncrypt, key.c_str(), 8);
 
			DES_key_schedule keySchedule;
			DES_set_key_unchecked(&keyEncrypt, &keySchedule);	
 
			const_DES_cblock inputText;
			DES_cblock outputText;
			vector<unsigned char> vecCiphertext;
			unsigned char tmp[8];
 
			for (int i = 0; i < cleartext.length() / 8; i ++) {
				memcpy(inputText, cleartext.c_str() + i * 8, 8);
				DES_ecb_encrypt(&inputText, &outputText, &keySchedule, DES_ENCRYPT);
				memcpy(tmp, outputText, 8);
 
				for (int j = 0; j < 8; j++)
					vecCiphertext.push_back(tmp[j]);
			}
 
			if (cleartext.length() % 8 != 0) {
				int tmp1 = cleartext.length() / 8 * 8;
				int tmp2 = cleartext.length() - tmp1;
				memset(inputText, 0, 8);
				memcpy(inputText, cleartext.c_str() + tmp1, tmp2);
 
				DES_ecb_encrypt(&inputText, &outputText, &keySchedule, DES_ENCRYPT);
				memcpy(tmp, outputText, 8);
 
				for (int j = 0; j < 8; j++)
					vecCiphertext.push_back(tmp[j]);
			}
 
			strCipherText.clear();
			strCipherText.assign(vecCiphertext.begin(), vecCiphertext.end());
		}
		break;
	case CBC:
		{
			DES_cblock keyEncrypt, ivec;
			memset(keyEncrypt, 0, 8);
 
			if (key.length() <= 8) 
				memcpy(keyEncrypt, key.c_str(), key.length());
			else 
				memcpy(keyEncrypt, key.c_str(), 8);
 
			DES_key_schedule keySchedule;
			DES_set_key_unchecked(&keyEncrypt, &keySchedule);	
 
			memcpy(ivec, cbc_iv, sizeof(cbc_iv));
 
			int iLength = cleartext.length() % 8 ? (cleartext.length() / 8 + 1) * 8 : cleartext.length();
			unsigned char* tmp = new unsigned char[iLength + 16];
			memset(tmp, 0, iLength);
 
			DES_ncbc_encrypt((const unsigned char*)cleartext.c_str(), tmp, cleartext.length()+1, &keySchedule, &ivec, DES_ENCRYPT);
	
			strCipherText = (char*)tmp;
 
			delete [] tmp;
		}
		break;
	case CFB:
		{
			DES_cblock keyEncrypt, ivec;
			memset(keyEncrypt, 0, 8);
 
			if (key.length() <= 8) 
				memcpy(keyEncrypt, key.c_str(), key.length());
			else 
				memcpy(keyEncrypt, key.c_str(), 8);
 
			DES_key_schedule keySchedule;
			DES_set_key_unchecked(&keyEncrypt, &keySchedule);	
 
			memcpy(ivec, cbc_iv, sizeof(cbc_iv));
 
			unsigned char* outputText = new unsigned char[cleartext.length()];
			memset(outputText, 0, cleartext.length());
 
			const unsigned char* tmp = (const unsigned char*)cleartext.c_str();
 
			DES_cfb_encrypt(tmp, outputText, 8, cleartext.length(), &keySchedule, &ivec, DES_ENCRYPT);
 
			strCipherText = (char*)outputText;
			
			delete [] outputText;
		}
		break;
	case TRIPLE_ECB:
		{
			DES_cblock ke1, ke2, ke3;
			memset(ke1, 0, 8);
			memset(ke2, 0, 8);
			memset(ke2, 0, 8);
 
			if (key.length() >= 24) {
				memcpy(ke1, key.c_str(), 8);
				memcpy(ke2, key.c_str() + 8, 8);
				memcpy(ke3, key.c_str() + 16, 8);
			} else if (key.length() >= 16) {
				memcpy(ke1, key.c_str(), 8);
				memcpy(ke2, key.c_str() + 8, 8);
				memcpy(ke3, key.c_str() + 16, key.length() - 16);
			} else if (key.length() >= 8) {
				memcpy(ke1, key.c_str(), 8);
				memcpy(ke2, key.c_str() + 8, key.length() - 8);
				memcpy(ke3, key.c_str(), 8);
			} else {
				memcpy(ke1, key.c_str(), key.length());
				memcpy(ke2, key.c_str(), key.length());
				memcpy(ke3, key.c_str(), key.length());
			}
 
			DES_key_schedule ks1, ks2, ks3;
			DES_set_key_unchecked(&ke1, &ks1);
			DES_set_key_unchecked(&ke2, &ks2);
			DES_set_key_unchecked(&ke3, &ks3);
 
			const_DES_cblock inputText;
			DES_cblock outputText;
			vector<unsigned char> vecCiphertext;
			unsigned char tmp[8];
 
			for (int i = 0; i < cleartext.length() / 8; i ++) {
				memcpy(inputText, cleartext.c_str() + i * 8, 8);
				DES_ecb3_encrypt(&inputText, &outputText, &ks1, &ks2, &ks3, DES_ENCRYPT);
				memcpy(tmp, outputText, 8);
 
				for (int j = 0; j < 8; j++)
					vecCiphertext.push_back(tmp[j]);
			}
 
			if (cleartext.length() % 8 != 0) {
				int tmp1 = cleartext.length() / 8 * 8;
				int tmp2 = cleartext.length() - tmp1;
				memset(inputText, 0, 8);
				memcpy(inputText, cleartext.c_str() + tmp1, tmp2);
 
				DES_ecb3_encrypt(&inputText, &outputText, &ks1, &ks2, &ks3, DES_ENCRYPT);
				memcpy(tmp, outputText, 8);
 
				for (int j = 0; j < 8; j++)
					vecCiphertext.push_back(tmp[j]);
			}
 
			strCipherText.clear();
			strCipherText.assign(vecCiphertext.begin(), vecCiphertext.end());
		}
		break;
	case TRIPLE_CBC:
		{
			DES_cblock ke1, ke2, ke3, ivec;
			memset(ke1, 0, 8);
			memset(ke2, 0, 8);
			memset(ke2, 0, 8);
 
			if (key.length() >= 24) {
				memcpy(ke1, key.c_str(), 8);
				memcpy(ke2, key.c_str() + 8, 8);
				memcpy(ke3, key.c_str() + 16, 8);
			} else if (key.length() >= 16) {
				memcpy(ke1, key.c_str(), 8);
				memcpy(ke2, key.c_str() + 8, 8);
				memcpy(ke3, key.c_str() + 16, key.length() - 16);
			} else if (key.length() >= 8) {
				memcpy(ke1, key.c_str(), 8);
				memcpy(ke2, key.c_str() + 8, key.length() - 8);
				memcpy(ke3, key.c_str(), 8);
			} else {
				memcpy(ke1, key.c_str(), key.length());
				memcpy(ke2, key.c_str(), key.length());
				memcpy(ke3, key.c_str(), key.length());
			}
 
			DES_key_schedule ks1, ks2, ks3;
			DES_set_key_unchecked(&ke1, &ks1);
			DES_set_key_unchecked(&ke2, &ks2);
			DES_set_key_unchecked(&ke3, &ks3);
 
			memcpy(ivec, cbc_iv, sizeof(cbc_iv));
 
			int iLength = cleartext.length() % 8 ? (cleartext.length() / 8 + 1) * 8 : cleartext.length();
			unsigned char* tmp = new unsigned char[iLength + 16];
			memset(tmp, 0, iLength);
 
			DES_ede3_cbc_encrypt((const unsigned char*)cleartext.c_str(), tmp, cleartext.length()+1, &ks1, &ks2, &ks3, &ivec, DES_ENCRYPT);
 
			strCipherText = (char*)tmp;
 
			delete [] tmp;
		}
		break;
	}
 
	return strCipherText;
}
 
string DES_Decrypt(const string ciphertext, const string key, CRYPTO_MODE mode)
{
	string strClearText;
 
	switch (mode) {
	case GENERAL:
	case ECB:
		{
			DES_cblock keyEncrypt;
			memset(keyEncrypt, 0, 8);
 
			if (key.length() <= 8) 
				memcpy(keyEncrypt, key.c_str(), key.length());
			else 
				memcpy(keyEncrypt, key.c_str(), 8);
 
			DES_key_schedule keySchedule;
			DES_set_key_unchecked(&keyEncrypt, &keySchedule);	
 
			const_DES_cblock inputText;
			DES_cblock outputText;
			vector<unsigned char> vecCleartext;
			unsigned char tmp[8];
 
			for (int i = 0; i < ciphertext.length() / 8; i ++) {
				memcpy(inputText, ciphertext.c_str() + i * 8, 8);
				DES_ecb_encrypt(&inputText, &outputText, &keySchedule, DES_DECRYPT);
				memcpy(tmp, outputText, 8);
 
				for (int j = 0; j < 8; j++)
					vecCleartext.push_back(tmp[j]);
			}
 
			if (ciphertext.length() % 8 != 0) {
				int tmp1 = ciphertext.length() / 8 * 8;
				int tmp2 = ciphertext.length() - tmp1;
				memset(inputText, 0, 8);
				memcpy(inputText, ciphertext.c_str() + tmp1, tmp2);
 
				DES_ecb_encrypt(&inputText, &outputText, &keySchedule, DES_DECRYPT);
				memcpy(tmp, outputText, 8);
 
				for (int j = 0; j < 8; j++)
					vecCleartext.push_back(tmp[j]);
			}
 
			strClearText.clear();
			strClearText.assign(vecCleartext.begin(), vecCleartext.end());
		}
		break;
	case CBC:
		{
			DES_cblock keyEncrypt, ivec;
			memset(keyEncrypt, 0, 8);
 
			if (key.length() <= 8) 
				memcpy(keyEncrypt, key.c_str(), key.length());
			else 
				memcpy(keyEncrypt, key.c_str(), 8);
 
			DES_key_schedule keySchedule;
			DES_set_key_unchecked(&keyEncrypt, &keySchedule);	
 
			memcpy(ivec, cbc_iv, sizeof(cbc_iv));
 
			int iLength = ciphertext.length() % 8 ? (ciphertext.length() / 8 + 1) * 8 : ciphertext.length();
			unsigned char* tmp = new unsigned char[iLength];
			memset(tmp, 0, iLength);
 
			DES_ncbc_encrypt((const unsigned char*)ciphertext.c_str(), tmp, ciphertext.length()+1, &keySchedule, &ivec, DES_DECRYPT);
 
			strClearText = (char*)tmp;
 
			delete [] tmp;
		}
		break;
	case CFB:
		{
			DES_cblock keyEncrypt, ivec;
			memset(keyEncrypt, 0, 8);
 
			if (key.length() <= 8) 
				memcpy(keyEncrypt, key.c_str(), key.length());
			else 
				memcpy(keyEncrypt, key.c_str(), 8);
 
			DES_key_schedule keySchedule;
			DES_set_key_unchecked(&keyEncrypt, &keySchedule);	
 
			memcpy(ivec, cbc_iv, sizeof(cbc_iv));
 
			unsigned char* outputText = new unsigned char[ciphertext.length()];
			memset(outputText, 0, ciphertext.length());
 
			const unsigned char* tmp = (const unsigned char*)ciphertext.c_str();
 
			DES_cfb_encrypt(tmp, outputText, 8, 32/*ciphertext.length() - 16*/, &keySchedule, &ivec, DES_DECRYPT);
 
			strClearText = (char*)outputText;
 
			delete [] outputText;
		}
		break;
	case TRIPLE_ECB:
		{
			DES_cblock ke1, ke2, ke3;
			memset(ke1, 0, 8);
			memset(ke2, 0, 8);
			memset(ke2, 0, 8);
 
			if (key.length() >= 24) {
				memcpy(ke1, key.c_str(), 8);
				memcpy(ke2, key.c_str() + 8, 8);
				memcpy(ke3, key.c_str() + 16, 8);
			} else if (key.length() >= 16) {
				memcpy(ke1, key.c_str(), 8);
				memcpy(ke2, key.c_str() + 8, 8);
				memcpy(ke3, key.c_str() + 16, key.length() - 16);
			} else if (key.length() >= 8) {
				memcpy(ke1, key.c_str(), 8);
				memcpy(ke2, key.c_str() + 8, key.length() - 8);
				memcpy(ke3, key.c_str(), 8);
			} else {
				memcpy(ke1, key.c_str(), key.length());
				memcpy(ke2, key.c_str(), key.length());
				memcpy(ke3, key.c_str(), key.length());
			}
 
			DES_key_schedule ks1, ks2, ks3;
			DES_set_key_unchecked(&ke1, &ks1);
			DES_set_key_unchecked(&ke2, &ks2);
			DES_set_key_unchecked(&ke3, &ks3);
 
			const_DES_cblock inputText;
			DES_cblock outputText;
			vector<unsigned char> vecCleartext;
			unsigned char tmp[8];
 
			for (int i = 0; i < ciphertext.length() / 8; i ++) {
				memcpy(inputText, ciphertext.c_str() + i * 8, 8);
				DES_ecb3_encrypt(&inputText, &outputText, &ks1, &ks2, &ks3, DES_DECRYPT);
				memcpy(tmp, outputText, 8);
 
				for (int j = 0; j < 8; j++)
					vecCleartext.push_back(tmp[j]);
			}
 
			if (ciphertext.length() % 8 != 0) {
				int tmp1 = ciphertext.length() / 8 * 8;
				int tmp2 = ciphertext.length() - tmp1;
				memset(inputText, 0, 8);
				memcpy(inputText, ciphertext.c_str() + tmp1, tmp2);
 
				DES_ecb3_encrypt(&inputText, &outputText, &ks1, &ks2, &ks3, DES_DECRYPT);
				memcpy(tmp, outputText, 8);
 
				for (int j = 0; j < 8; j++)
					vecCleartext.push_back(tmp[j]);
			}
 
			strClearText.clear();
			strClearText.assign(vecCleartext.begin(), vecCleartext.end());
		}
		break;
	case TRIPLE_CBC:
		{
			DES_cblock ke1, ke2, ke3, ivec;
			memset(ke1, 0, 8);
			memset(ke2, 0, 8);
			memset(ke2, 0, 8);
 
			if (key.length() >= 24) {
				memcpy(ke1, key.c_str(), 8);
				memcpy(ke2, key.c_str() + 8, 8);
				memcpy(ke3, key.c_str() + 16, 8);
			} else if (key.length() >= 16) {
				memcpy(ke1, key.c_str(), 8);
				memcpy(ke2, key.c_str() + 8, 8);
				memcpy(ke3, key.c_str() + 16, key.length() - 16);
			} else if (key.length() >= 8) {
				memcpy(ke1, key.c_str(), 8);
				memcpy(ke2, key.c_str() + 8, key.length() - 8);
				memcpy(ke3, key.c_str(), 8);
			} else {
				memcpy(ke1, key.c_str(), key.length());
				memcpy(ke2, key.c_str(), key.length());
				memcpy(ke3, key.c_str(), key.length());
			}
 
			DES_key_schedule ks1, ks2, ks3;
			DES_set_key_unchecked(&ke1, &ks1);
			DES_set_key_unchecked(&ke2, &ks2);
			DES_set_key_unchecked(&ke3, &ks3);
 
			memcpy(ivec, cbc_iv, sizeof(cbc_iv));
 
			int iLength = ciphertext.length() % 8 ? (ciphertext.length() / 8 + 1) * 8 : ciphertext.length();
			unsigned char* tmp = new unsigned char[iLength];
			memset(tmp, 0, iLength);
 
			DES_ede3_cbc_encrypt((const unsigned char*)ciphertext.c_str(), tmp, ciphertext.length()+1, &ks1, &ks2, &ks3, &ivec, DES_DECRYPT);
 
			strClearText = (char*)tmp;
 
			delete [] tmp;
		}
		break;
	}
 
	return strClearText;
}

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  1. main.cpp:
#include "stdafx.h"
#include "cryptotest.h"
#include <iostream>
#include <string>
 
using namespace std;
 
void test_DES()
{
	string cleartext = "中国北京12345$abcde%ABCDE@！！！!";
	string ciphertext = "";
	string key = "beijingchina1234567890ABCDEFGH!!!";
 
	CRYPTO_MODE mode = TRIPLE_CBC;
 
	ciphertext = DES_Encrypt(cleartext, key, mode);
	string decrypt = DES_Decrypt(ciphertext, key, mode);
 
	cout<<"src cleartext: "<<cleartext<<endl;
	cout<<"genarate ciphertext: "<<ciphertext<<endl;
	cout<<"src ciphertext: "<<ciphertext<<endl;
	cout<<"genarate cleartext: "<<decrypt<<endl;
 
	if (strcmp(cleartext.c_str(), decrypt.c_str()) == 0)
		cout<<"DES crypto ok!!!"<<endl;
	else
		cout<<"DES crypto error!!!"<<endl;
}
 
 
int main(int argc, char* argv[])
{
	test_DES();
 
	cout<<"ok!!!"<<endl;
 
	return 0;
}

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GitHub： https://github.com/fengbingchun/OpenSSL_Test

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