VC++使用OpenSSL的DES加密

引用：http://www.cnblogs.com/findumars/p/7252839.html

使用OpenSSL的库，需要先安装或编译OpenSSL。

我是在这里使用别人编译的开发版：http://slproweb.com/products/Win32OpenSSL.html。安装后把安装目录中的include，bin，lib目录中的文件放到自己的工程目录中。

我这里直接略过了。

DES_Openssl.h

#pragma once#include <string>using namespace std;const string m_desKey = "20171010";class CDes_Openssl{public:CDes_Openssl(void);~CDes_Openssl(void);public:CString MyDesDecrypt(CString strCipher);//解密CString MyDesEncrypt(CString strClear);//加密private:std::string des_encrypt(const std::string &clearText, const std::string &key);std::string des_decrypt(const std::string &cipherText, const std::string &key);private://下面加的是转换函数，如果不是mfc程序，可以忽略，直接用des_encrypt，des_decrypt加解密void Multi2Wide(const char* pSource, CString& strGet);void Wide2MultiChar(CString& strSource, char* pResult);//字节流转换为十六进制字符串  void Hex2Str( const char *sSrc, char *sDest, int nSrcLen );//字节流转换为十六进制字符串  void ByteToHexStr(const unsigned char* source, char* dest, int sourceLen);//十六进制字符串转换为字节流  void HexStrToByte(const char* source, unsigned char* dest, int sourceLen);};

DES_Openssl.cpp

#include "StdAfx.h"#include "Des_Openssl.h"#include "openssl/des.h"#include <vector>CDes_Openssl::CDes_Openssl(void){}CDes_Openssl::~CDes_Openssl(void){}// ---- des对称加解密 ---- //    // 加密 ecb模式    std::string CDes_Openssl::des_encrypt(const std::string &clearText, const std::string &key){std::string cipherText; // 密文    DES_cblock keyEncrypt;memset(keyEncrypt, 0, 8);// 构造补齐后的密钥    if (key.length() <= 8)memcpy(keyEncrypt, key.c_str(), key.length());elsememcpy(keyEncrypt, key.c_str(), 8);// 密钥置换    DES_key_schedule keySchedule;DES_set_key_unchecked(&keyEncrypt, &keySchedule);// 循环加密，每8字节一次    const_DES_cblock inputText;DES_cblock outputText;std::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);// 加密函数    DES_ecb_encrypt(&inputText, &outputText, &keySchedule, DES_ENCRYPT);memcpy(tmp, outputText, 8);for (int j = 0; j < 8; j++)vecCiphertext.push_back(tmp[j]);}cipherText.clear();cipherText.assign(vecCiphertext.begin(), vecCiphertext.end());return cipherText;}// 解密 ecb模式    std::string CDes_Openssl::des_decrypt(const std::string &cipherText, const std::string &key){std::string clearText; // 明文    DES_cblock keyEncrypt;memset(keyEncrypt, 0, 8);if (key.length() <= 8)memcpy(keyEncrypt, key.c_str(), key.length());elsememcpy(keyEncrypt, key.c_str(), 8);DES_key_schedule keySchedule;DES_set_key_unchecked(&keyEncrypt, &keySchedule);const_DES_cblock inputText;DES_cblock outputText;std::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);// 解密函数    DES_ecb_encrypt(&inputText, &outputText, &keySchedule, DES_DECRYPT);memcpy(tmp, outputText, 8);for (int j = 0; j < 8; j++)vecCleartext.push_back(tmp[j]);}clearText.clear();clearText.assign(vecCleartext.begin(), vecCleartext.end());return clearText;}CString CDes_Openssl::MyDesDecrypt(CString strIn){CString strRet = 0;char szCipher[1024];Wide2MultiChar(strIn, szCipher);char szDest[1024] = {0};HexStrToByte(szCipher, (unsigned char*)szDest, strlen(szCipher));string strR = szDest;string strClear = des_decrypt(strR, m_desKey);Multi2Wide(strClear.c_str(), strRet);return strRet;}CString CDes_Openssl::MyDesEncrypt(CString strIn)//加密{char szClear[50] = {0};Wide2MultiChar(strIn, szClear);string strClear = szClear;string strCipher = des_encrypt(strClear, m_desKey);char szEncryptTxt[1024] = { 0 };Hex2Str(strCipher.c_str(), szEncryptTxt, strCipher.length());CString strRet1;Multi2Wide(szEncryptTxt, strRet1);return strRet1;}void CDes_Openssl::Multi2Wide(const char* pSource, CString& strGet){DWORD dwNum = MultiByteToWideChar(CP_ACP, 0, pSource, -1, NULL, 0);TCHAR* szIP = new TCHAR[dwNum];//nRetLen = dwNum;memset(szIP, 0, dwNum);MultiByteToWideChar(CP_ACP, 0, pSource, -1, szIP, dwNum);strGet = szIP;delete[] szIP;}void CDes_Openssl::Wide2MultiChar(CString& strSource, char* pResult){DWORD dwNum = WideCharToMultiByte(CP_ACP, 0, strSource, -1, NULL, 0, NULL, NULL);//char* szRet = new char[dwNum + 1];int nLen = dwNum;//memset(szRet, 0, dwNum + 1);WideCharToMultiByte(CP_ACP, 0, strSource, -1, pResult, dwNum, NULL, NULL);}void CDes_Openssl::Hex2Str(const char *sSrc, char *sDest, int nSrcLen){int  i;  char szTmp[3];  for( i = 0; i < nSrcLen; i++ )  {  sprintf( szTmp, "%02X", (unsigned char) sSrc[i] );  memcpy( &sDest[i * 2], szTmp, 2 );  }  return ; }void CDes_Openssl::ByteToHexStr(const unsigned char* source, char* dest, int sourceLen){short i;  unsigned char highByte, lowByte;  for (i = 0; i < sourceLen; i++)  {  highByte = source[i] >> 4;  lowByte = source[i] & 0x0f ;  highByte += 0x30;  if (highByte > 0x39)  dest[i * 2] = highByte + 0x07;  else  dest[i * 2] = highByte;  lowByte += 0x30;  if (lowByte > 0x39)  dest[i * 2 + 1] = lowByte + 0x07;  else  dest[i * 2 + 1] = lowByte;  }  return ;  }void CDes_Openssl::HexStrToByte(const char* source, unsigned char* dest, int sourceLen){short i;  unsigned char highByte, lowByte;  for (i = 0; i < sourceLen; i += 2)  {  highByte = toupper(source[i]);  lowByte  = toupper(source[i + 1]);  if (highByte > 0x39)  highByte -= 0x37;  else  highByte -= 0x30;  if (lowByte > 0x39)  lowByte -= 0x37;  else  lowByte -= 0x30;  dest[i / 2] = (highByte << 4) | lowByte;  }  return ;  }

我是根据自己的情况封装。