对MD5的简单处理

   一个对MD5的简单处理，没什么好看的，就是无聊之极写写玩···

//---------------------------------------------------------------/** 对MD5码进行简单的转化* Compiled: VC2005* Auth: 陈相礼* Data: 2009/11/26*///---------------------------------------------------------------#include <iostream>#include <string>using namespace std;//---------------------------------------------------------------// 转换矩阵char mEncryptTable[4][4] = {'0', '1', '2', '3','4', '5', '6', '7','8', '9', 'a', 'b','c', 'd', 'e', 'f',};//---------------------------------------------------------------// 封装class CEncrypt{public:void encryptPwd( std::string pas, std::string& encrypted );void decryptPwd( std::string pas, std::string& decrypted );protected:private:};//---------------------------------------------------------------// 解密模块// 输入：64位字符串； 输出：解密的MD5码void CEncrypt::decryptPwd( std::string pas, std::string& decrypted ){size_t nLen = strlen( pas.c_str() );if ( nLen != 64 ){// 密码长度校验decrypted = "";return;}char szSour[65];char szDest[34];size_t i = 0;strcpy_s( szSour, 65, pas.c_str() );for ( ; i < nLen; i += 2 ){if ( szSour[i] - '0' > 3 || szSour[i] - '0' < 0 || szSour[i + 1] - '0' > 3 || szSour[i + 1] - '0' < 0 ){// 密码有效性校验decrypted = "";return;}szDest[ i/2 ] = mEncryptTable[ szSour[i] - '0' ][ szSour[i + 1] - '0' ];}szDest[i/2] = '/0';decrypted = szDest;}//---------------------------------------------------------------// 加密模块// 输入：待加密的32位MD5码； 输出：64位处理后的字符串void CEncrypt::encryptPwd( std::string pas, std::string& encrypted ){size_t nLen = strlen( pas.c_str() );char szSour[33];int nDest[64];char szDest[65];strcpy_s( szSour, 33, pas.c_str() );for ( size_t i = 0; i < nLen; ++i ){int x, y;for ( int j = 0; j < 4; ++j ){int flag = 0;for ( int k = 0; k < 4; ++k ){if ( szSour[i] == mEncryptTable[j][k] ){x = j;y = k;flag = 1;break;}}if ( flag ){break;}}nDest[2 * i] = x + '0';nDest[2 * i + 1] = y + '0';}int i = 0;for ( i = 0; i < 64; ++i ){szDest[i] = nDest[i];}szDest[i] = '/0';encrypted = szDest;}//---------------------------------------------------------------// 测试主程序int main(){char *szContent = "0123456789abcdeffedcba9876543210";std::string outStr;std::string inStr;CEncrypt mTest;cout << "源MD5：" << endl;cout << szContent << endl;cout << "加密后：" << endl;mTest.encryptPwd( szContent, outStr );cout << outStr << endl;cout << "解密后：" << endl;mTest.decryptPwd( outStr, inStr );cout << inStr << endl;system( "pause" );return 0;}