MFC下MD5加密算法实现，带key（32位MD5小写）

以下转自：http://www.cnblogs.com/littlex/archive/2012/10/22/2733828.html

在百度上验证，与网上的32位MD5小写加密相同：http://www.baidu.com/s?tn=baiduhome_pg&ie=utf-8&bs=md5%E6%A0%A1%E9%AA%8C&f=8&rsv_bp=1&rsv_spt=1&wd=md5&rsv_sug3=2&rsv_sug=0&rsv_sug4=232&rsv_sug1=1&inputT=401

但……简单的可以破解：http://www.cmd5.com/

以下就做一下简单的介绍和使用：

1、首先是.h的头文件。

#ifndef MD5_H #define MD5_H #include <string> #include <fstream> /* Type define */typedef unsigned char byte; typedef unsigned int uint32; using std::string; using std::ifstream; /* MD5 declaration. */class MD5 { public:     MD5();     MD5(const void* input, size_t length);     MD5(const string& str);     MD5(ifstream& in);     void update(const void* input, size_t length);     void update(const string& str);     void update(ifstream& in);     const byte* digest();     string toString();     void reset();     string ToMD5(const string& str);    //如此，只需调用该函数便完成加密过程private:     void update(const byte* input, size_t length);     void final();     void transform(const byte block[64]);     void encode(const uint32* input, byte* output, size_t length);     void decode(const byte* input, uint32* output, size_t length);     string bytesToHexString(const byte* input, size_t length);         /* class uncopyable */    MD5(const MD5&);     MD5& operator=(const MD5&); private:     uint32 _state[4];   /* state (ABCD) */    uint32 _count[2];   /* number of bits, modulo 2^64 (low-order word first) */    byte _buffer[64];   /* input buffer */    byte _digest[16];   /* message digest */    bool _finished;     /* calculate finished ? */    static const byte PADDING[64];  /* padding for calculate */    static const char HEX[16];     enum { BUFFER_SIZE = 1024 }; }; #endif /*MD5_H*/

 

2、接下来是.cpp的内容：

//说明：32位MD5小写数据加密#include "stdafx.h" #include "md5.h" const string MD5_Key="miao";using namespace std; /* Constants for MD5Transform routine. */#define S11 7 #define S12 12 #define S13 17 #define S14 22 #define S21 5 #define S22 9 #define S23 14 #define S24 20 #define S31 4 #define S32 11 #define S33 16 #define S34 23 #define S41 6 #define S42 10 #define S43 15 #define S44 21 /* F, G, H and I are basic MD5 functions. */#define F(x, y, z) (((x) & (y)) | ((~x) & (z))) #define G(x, y, z) (((x) & (z)) | ((y) & (~z))) #define H(x, y, z) ((x) ^ (y) ^ (z)) #define I(x, y, z) ((y) ^ ((x) | (~z))) /* ROTATE_LEFT rotates x left n bits. */#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) /* FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4. Rotation is separate from addition to prevent recomputation. */#define FF(a, b, c, d, x, s, ac) { (a) += F ((b), (c), (d)) + (x) + ac; (a) = ROTATE_LEFT ((a), (s)); (a) += (b); } #define GG(a, b, c, d, x, s, ac) { (a) += G ((b), (c), (d)) + (x) + ac; (a) = ROTATE_LEFT ((a), (s)); (a) += (b); } #define HH(a, b, c, d, x, s, ac) { (a) += H ((b), (c), (d)) + (x) + ac; (a) = ROTATE_LEFT ((a), (s)); (a) += (b); } #define II(a, b, c, d, x, s, ac) { (a) += I ((b), (c), (d)) + (x) + ac; (a) = ROTATE_LEFT ((a), (s)); (a) += (b); } const byte MD5::PADDING[64] = { 0x80 }; const char MD5::HEX[16] = {     '0', '1', '2', '3',     '4', '5', '6', '7',     '8', '9', 'a', 'b',     'c', 'd', 'e', 'f'}; /* Default construct. */MD5::MD5() {     reset(); } /* Construct a MD5 object with a input buffer. */MD5::MD5(const void* input, size_t length) {     reset();     update(input, length); } /* Construct a MD5 object with a string. */MD5::MD5(const string& str) {     reset();     update(str); } /* Construct a MD5 object with a file. */MD5::MD5(ifstream& in) {     reset();     update(in); } /* Return the message-digest */const byte* MD5::digest() {     if (!_finished) {         _finished = true;         final();     }     return _digest; } /* Reset the calculate state */void MD5::reset() {     _finished = false;     /* reset number of bits. */    _count[0] = _count[1] = 0;     /* Load magic initialization constants. */    _state[0] = 0x67452301;     _state[1] = 0xefcdab89;     _state[2] = 0x98badcfe;     _state[3] = 0x10325476; } /* Updating the context with a input buffer. */void MD5::update(const void* input, size_t length) {     update((const byte*)input, length); } /* Updating the context with a string. */void MD5::update(const string& str) {     update((const byte*)str.c_str(), str.length()); } /* Updating the context with a file. */void MD5::update(ifstream& in) {     if (!in) {         return;     }     std::streamsize length;     char buffer[BUFFER_SIZE];     while (!in.eof()) {         in.read(buffer, BUFFER_SIZE);         length = in.gcount();         if (length > 0) {             update(buffer, length);         }     }     in.close(); } /* MD5 block update operation. Continues an MD5 message-digest operation, processing another message block, and updating the context. */void MD5::update(const byte* input, size_t length) {     uint32 i, index, partLen;     _finished = false;     /* Compute number of bytes mod 64 */    index = (uint32)((_count[0] >> 3) & 0x3f);     /* update number of bits */    if ((_count[0] += ((uint32)length << 3)) < ((uint32)length << 3)) {         ++_count[1];     }     _count[1] += ((uint32)length >> 29);     partLen = 64 - index;     /* transform as many times as possible. */    if (length >= partLen) {         memcpy(&_buffer[index], input, partLen);         transform(_buffer);         for (i = partLen; i + 63 < length; i += 64) {             transform(&input[i]);         }         index = 0;     } else {         i = 0;     }     /* Buffer remaining input */    memcpy(&_buffer[index], &input[i], length - i); } /* MD5 finalization. Ends an MD5 message-_digest operation, writing the the message _digest and zeroizing the context. */void MD5::final() {     byte bits[8];     uint32 oldState[4];     uint32 oldCount[2];     uint32 index, padLen;     /* Save current state and count. */    memcpy(oldState, _state, 16);     memcpy(oldCount, _count, 8);     /* Save number of bits */    encode(_count, bits, 8);     /* Pad out to 56 mod 64. */    index = (uint32)((_count[0] >> 3) & 0x3f);     padLen = (index < 56) ? (56 - index) : (120 - index);     update(PADDING, padLen);     /* Append length (before padding) */    update(bits, 8);     /* Store state in digest */    encode(_state, _digest, 16);     /* Restore current state and count. */    memcpy(_state, oldState, 16);     memcpy(_count, oldCount, 8); } /* MD5 basic transformation. Transforms _state based on block. */void MD5::transform(const byte block[64]) {     uint32 a = _state[0], b = _state[1], c = _state[2], d = _state[3], x[16];     decode(block, x, 64);     /* Round 1 */    FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */    FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */    FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */    FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */    FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */    FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */    FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */    FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */    FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */    FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */    FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */    FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */    FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */    FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */    FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */    FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */    /* Round 2 */    GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */    GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */    GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */    GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */    GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */    GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */    GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */    GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */    GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */    GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */    GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */    GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */    GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */    GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */    GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */    GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */    /* Round 3 */    HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */    HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */    HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */    HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */    HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */    HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */    HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */    HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */    HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */    HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */    HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */    HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */    HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */    HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */    HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */    HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */    /* Round 4 */    II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */    II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */    II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */    II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */    II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */    II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */    II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */    II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */    II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */    II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */    II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */    II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */    II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */    II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */    II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */    II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */    _state[0] += a;     _state[1] += b;     _state[2] += c;     _state[3] += d; } /* Encodes input (ulong) into output (byte). Assumes length is a multiple of 4. */void MD5::encode(const uint32* input, byte* output, size_t length) {     for (size_t i = 0, j = 0; j < length; ++i, j += 4) {         output[j]= (byte)(input[i] & 0xff);         output[j + 1] = (byte)((input[i] >> 8) & 0xff);         output[j + 2] = (byte)((input[i] >> 16) & 0xff);         output[j + 3] = (byte)((input[i] >> 24) & 0xff);     } } /* Decodes input (byte) into output (ulong). Assumes length is a multiple of 4. */void MD5::decode(const byte* input, uint32* output, size_t length) {     for (size_t i = 0, j = 0; j < length; ++i, j += 4) {         output[i] = ((uint32)input[j]) | (((uint32)input[j + 1]) << 8) |             (((uint32)input[j + 2]) << 16) | (((uint32)input[j + 3]) << 24);     } } /* Convert byte array to hex string. */string MD5::bytesToHexString(const byte* input, size_t length) {     string str;     str.reserve(length << 1);     for (size_t i = 0; i < length; ++i) {         int t = input[i];         int a = t / 16;         int b = t % 16;         str.append(1, HEX[a]);         str.append(1, HEX[b]);     }     return str; } /* Convert digest to string value */string MD5::toString() {     return bytesToHexString(digest(), 16); } string MD5::ToMD5(const string& str)    //MD5加密，其中密钥key=xyf，密钥需加在加密之前{    const string str_word=str+MD5_Key;    reset();    update(str_word);    return toString();}

 

原来的使用方法：

3、文件名为：md5.h 和  md5.cpp

4、使用时直接include的引用：#include "md5.h"

5、使用方法

MD5 md5;                 //定义MD5的类

CString sql="123456";           //需要加密的字符串
md5.update(sql.GetBuffer());    //因为update函数只接收string类型，所以使用getbuffer()函数转换CString为string
sqlvalue=md5.toString().c_str();     //toString()函数获得加密字符串，c_str();函数重新转换成CString类型

注意：每次加密一个字符串，需要调用reset()函数一次。 例如：md5.reset();  //用于去除原字符串内容，这样又能继续加密下一个字符串了