这个是网上扒下来的 作者已经无法知道是谁了

MD5.h

#ifndef MD5_H #define MD5_H #include <string> #include <fstream> typedef unsigned char byte;typedef unsigned int uint32;typedef unsigned int uint4;using std::string;using std::ifstream;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(); inline uint4 rotate_left(uint4 x, int n); inline void FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac); inline void GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac); inline void HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac); inline void II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac);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); MD5(const MD5&); MD5& operator=(const MD5&);private: uint32 _state[4]; uint32 _count[2]; byte _buffer[64]; byte _digest[16]; bool _finished; static const byte PADDING[64]; static const char HEX[16]; static const size_t BUFFER_SIZE = 1024;};string FileDigest(const string &file);#endif

MD5.cpp

#include "md5.h" using namespace std;#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 #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))) #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) //#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); \//}inline uint4 MD5::rotate_left(uint4 x, int n) { return (x << n) | (x >> (32 - n));}inline void MD5::FF(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { a = rotate_left(a + F(b, c, d) + x + ac, s) + b;}inline void MD5::GG(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { a = rotate_left(a + G(b, c, d) + x + ac, s) + b;}inline void MD5::HH(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { a = rotate_left(a + H(b, c, d) + x + ac, s) + b;}inline void MD5::II(uint4 &a, uint4 b, uint4 c, uint4 d, uint4 x, uint4 s, uint4 ac) { a = rotate_left(a + I(b, c, d) + x + ac, s) + 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'};MD5::MD5() { reset();}MD5::MD5(const void *input, size_t length) { reset(); update(input, length);}MD5::MD5(const string &str) { reset(); update(str);}MD5::MD5(ifstream &in) { reset(); update(in);}const byte* MD5::digest() { if (!_finished) { _finished = true; final(); } return _digest;}void MD5::reset() { _finished = false; _count[0] = _count[1] = 0; _state[0] = 0x67452301; _state[1] = 0xefcdab89; _state[2] = 0x98badcfe; _state[3] = 0x10325476;}void MD5::update(const void *input, size_t length) { update((const byte*)input, length);}void MD5::update(const string &str) { update((const byte*)str.c_str(), str.length());}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();}void MD5::update(const byte *input, size_t length) { uint32 i, index, partLen; _finished = false; index = (uint32)((_count[0] >> 3) & 0x3f); if ((_count[0] += ((uint32)length << 3)) < ((uint32)length << 3)) _count[1]++; _count[1] += ((uint32)length >> 29); partLen = 64 - index; 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; } memcpy(&_buffer[index], &input[i], length - i);}void MD5::final() { byte bits[8]; uint32 oldState[4]; uint32 oldCount[2]; uint32 index, padLen; memcpy(oldState, _state, 16); memcpy(oldCount, _count, 8); encode(_count, bits, 8); index = (uint32)((_count[0] >> 3) & 0x3f); padLen = (index < 56) ? (56 - index) : (120 - index); update(PADDING, padLen); update(bits, 8); encode(_state, _digest, 16); memcpy(_state, oldState, 16); memcpy(_count, oldCount, 8);}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); FF(a, b, c, d, x[0], S11, 0xd76aa478); FF(d, a, b, c, x[1], S12, 0xe8c7b756); FF(c, d, a, b, x[2], S13, 0x242070db); FF(b, c, d, a, x[3], S14, 0xc1bdceee); FF(a, b, c, d, x[4], S11, 0xf57c0faf); FF(d, a, b, c, x[5], S12, 0x4787c62a); FF(c, d, a, b, x[6], S13, 0xa8304613); FF(b, c, d, a, x[7], S14, 0xfd469501); FF(a, b, c, d, x[8], S11, 0x698098d8); FF(d, a, b, c, x[9], S12, 0x8b44f7af); FF(c, d, a, b, x[10], S13, 0xffff5bb1); FF(b, c, d, a, x[11], S14, 0x895cd7be); FF(a, b, c, d, x[12], S11, 0x6b901122); FF(d, a, b, c, x[13], S12, 0xfd987193); FF(c, d, a, b, x[14], S13, 0xa679438e); FF(b, c, d, a, x[15], S14, 0x49b40821); GG(a, b, c, d, x[1], S21, 0xf61e2562); GG(d, a, b, c, x[6], S22, 0xc040b340); GG(c, d, a, b, x[11], S23, 0x265e5a51); GG(b, c, d, a, x[0], S24, 0xe9b6c7aa); GG(a, b, c, d, x[5], S21, 0xd62f105d); GG(d, a, b, c, x[10], S22, 0x2441453); GG(c, d, a, b, x[15], S23, 0xd8a1e681); GG(b, c, d, a, x[4], S24, 0xe7d3fbc8); GG(a, b, c, d, x[9], S21, 0x21e1cde6); GG(d, a, b, c, x[14], S22, 0xc33707d6); GG(c, d, a, b, x[3], S23, 0xf4d50d87); GG(b, c, d, a, x[8], S24, 0x455a14ed); GG(a, b, c, d, x[13], S21, 0xa9e3e905); GG(d, a, b, c, x[2], S22, 0xfcefa3f8); GG(c, d, a, b, x[7], S23, 0x676f02d9); GG(b, c, d, a, x[12], S24, 0x8d2a4c8a); HH(a, b, c, d, x[5], S31, 0xfffa3942); HH(d, a, b, c, x[8], S32, 0x8771f681); HH(c, d, a, b, x[11], S33, 0x6d9d6122); HH(b, c, d, a, x[14], S34, 0xfde5380c); HH(a, b, c, d, x[1], S31, 0xa4beea44); HH(d, a, b, c, x[4], S32, 0x4bdecfa9); HH(c, d, a, b, x[7], S33, 0xf6bb4b60); HH(b, c, d, a, x[10], S34, 0xbebfbc70); HH(a, b, c, d, x[13], S31, 0x289b7ec6); HH(d, a, b, c, x[0], S32, 0xeaa127fa); HH(c, d, a, b, x[3], S33, 0xd4ef3085); HH(b, c, d, a, x[6], S34, 0x4881d05); HH(a, b, c, d, x[9], S31, 0xd9d4d039); HH(d, a, b, c, x[12], S32, 0xe6db99e5); HH(c, d, a, b, x[15], S33, 0x1fa27cf8); HH(b, c, d, a, x[2], S34, 0xc4ac5665); II(a, b, c, d, x[0], S41, 0xf4292244); II(d, a, b, c, x[7], S42, 0x432aff97); II(c, d, a, b, x[14], S43, 0xab9423a7); II(b, c, d, a, x[5], S44, 0xfc93a039); II(a, b, c, d, x[12], S41, 0x655b59c3); II(d, a, b, c, x[3], S42, 0x8f0ccc92); II(c, d, a, b, x[10], S43, 0xffeff47d); II(b, c, d, a, x[1], S44, 0x85845dd1); II(a, b, c, d, x[8], S41, 0x6fa87e4f); II(d, a, b, c, x[15], S42, 0xfe2ce6e0); II(c, d, a, b, x[6], S43, 0xa3014314); II(b, c, d, a, x[13], S44, 0x4e0811a1); II(a, b, c, d, x[4], S41, 0xf7537e82); II(d, a, b, c, x[11], S42, 0xbd3af235); II(c, d, a, b, x[2], S43, 0x2ad7d2bb); II(b, c, d, a, x[9], S44, 0xeb86d391); _state[0] += a; _state[1] += b; _state[2] += c; _state[3] += d;}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); }}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); }}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;}string MD5::toString() { return bytesToHexString(digest(), 16);}//得到二进制文件的MD5码string FileDigest(const string &file) { ifstream in(file.c_str(), ios::binary); if (!in) return ""; MD5 md5; md5.reset(); std::streamsize length; char buffer[1024]; while (!in.eof()) { in.read(buffer, 1024); length = in.gcount(); if (length > 0) md5.update(buffer, length); } in.close(); return md5.toString();}

调用main.cpp

// Md5Test.cpp : 定义控制台应用程序的入口点。//#include "stdafx.h"#include "MD5.h"#include <fstream>#include <process.h>int main(){ std::ifstream of("ReadMe.txt", std::ios::in | std::ios::binary); if (!of.is_open())return 0; MD5 fileMd5(of); printf("%s\r\n", fileMd5.toString().c_str()); MD5 strMd5("123456789"); printf("%s\r\n", strMd5.toString().c_str()); system("pause"); return 0;}

这篇文章就介绍到这了，需要的朋友可以参考下面的相关文章。