MD5源码

    因工作需要，昨天研究了一下 MD5 算法。现将源码贴出，希望对需要的人有所帮助。同时，希望大家指正不足之处。

 

    源代码下载：http://d.download.csdn.net/down/1935091/andy331741209

 

////////////////////////////////////////////////////////////////////////////MD5.h#ifndef MD5_H#define MD5_H#if _MSC_VER > 1000#pragma once#endif // _MSC_VER > 1000typedef unsigned char TYBYTE;typedef unsigned int TYUINT;class CMD5{public:CMD5(void);char* GetFileMD5Values(const char* pFileName);char* GetStringMD5Values(const char* pStr);private:void Init(void);void UpDate(const TYBYTE* input, TYUINT length);void Transform(const TYBYTE* block);void DeCode(const TYBYTE* input, TYUINT* output, TYUINT length);void EnCode(const TYUINT* input, TYBYTE* output, TYUINT length);void SetMD5Code(const TYBYTE* input, TYUINT length);const TYBYTE* Digest();private:TYUINTm_state[4];// state (ABCD)TYUINTm_count[2];// number of bits, modulo 2^64 (low-order word first)TYBYTEm_buffer[64];// input bufferTYBYTEm_digest[16];// message digestcharm_MD5Val[33];// 保存 MD5 值};#endif//MD5_H

////////////////////////////////////////////////////////////////////////////MD5.cpp#include "MD5.h"#include <fstream>using std::ifstream;////////////////////////////////////////////////////////////////////////////定义一个 4x4 矩阵#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 CMD5 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 int BUFFER_SIZE = 1024;const TYBYTE PADDING[64] = { 0x80 };const char HEX[16] = {'0', '1', '2', '3','4', '5', '6', '7','8', '9', 'a', 'b','c', 'd', 'e', 'f'};////////////////////////////////////////////////////////////////////////////默认构造函数CMD5::CMD5(void) {}////////////////////////////////////////////////////////////////////////////重置void CMD5::Init(){m_count[0] = 0;m_count[1] = 0;m_state[0] = 0x67452301;m_state[1] = 0xefcdab89;m_state[2] = 0x98badcfe;m_state[3] = 0x10325476;memset(m_MD5Val, 0, 33);}////////////////////////////////////////////////////////////////////////////void CMD5::UpDate(const TYBYTE* input, TYUINT length) {TYUINT i, index, partLen;/* Compute number of bytes mod 64 */index = (TYUINT)((m_count[0] >> 3) & 0x3f);/* update number of bits */if ((m_count[0] += ((TYUINT)length << 3)) < ((TYUINT)length << 3)) {++m_count[1];}m_count[1] += ((TYUINT)length >> 29);partLen = 64 - index;/* transform as many times as possible. */if (length >= partLen) {memcpy(&m_buffer[index], input, partLen);Transform(m_buffer);for (i = partLen; i + 63 < length; i += 64){Transform(&input[i]);}index = 0;} else {i = 0;}/* Buffer remaining input */memcpy(&m_buffer[index], &input[i], length - i);}////////////////////////////////////////////////////////////////////////////void CMD5::Transform(const TYBYTE block[64]){TYUINT a = m_state[0];TYUINT b = m_state[1];TYUINT c = m_state[2];TYUINT d = m_state[3];TYUINT x[16] = {0};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 */m_state[0] += a;m_state[1] += b;m_state[2] += c;m_state[3] += d;}////////////////////////////////////////////////////////////////////////////void CMD5::DeCode(const TYBYTE* input, TYUINT* output, TYUINT length){for (TYUINT i = 0, j = 0; j < length; ++i, j += 4) {output[i] = ((TYUINT)input[j]) | (((TYUINT)input[j + 1]) << 8) | (((TYUINT)input[j + 2]) << 16) | (((TYUINT)input[j + 3]) << 24);}}////////////////////////////////////////////////////////////////////////////void CMD5::EnCode(const TYUINT* input, TYBYTE* output, TYUINT length){for (size_t i = 0, j = 0; j < length; ++i, j += 4){output[j] = (TYBYTE)(input[i] & 0xff);output[j + 1] = (TYBYTE)((input[i] >> 8) & 0xff);output[j + 2] = (TYBYTE)((input[i] >> 16) & 0xff);output[j + 3] = (TYBYTE)((input[i] >> 24) & 0xff);}}////////////////////////////////////////////////////////////////////////////计算 MD5 值void CMD5::SetMD5Code(const TYBYTE* input, TYUINT length){int t, a, b;for (size_t i = 0; i < length; ++i) {t = input[i];a = t / 16;b = t % 16;m_MD5Val[2 * i] = HEX[a];m_MD5Val[2 * i + 1] = HEX[b];}}////////////////////////////////////////////////////////////////////////////获取文件的 MD5 值char* CMD5::GetFileMD5Values(const char* pFileName){Init();ifstream file(pFileName);if (!file) {/* 加载文件失败，返回空串 */return "";}std::streamsize length;char buffer[BUFFER_SIZE];while (!file.eof()) {memset(buffer, 0, BUFFER_SIZE);file.read(buffer, BUFFER_SIZE);length = file.gcount();if (length > 0) {UpDate((const TYBYTE*)buffer, length);}}file.close();SetMD5Code(Digest(), 16);return m_MD5Val;}////////////////////////////////////////////////////////////////////////////获取字符串的 MD5 值char* CMD5::GetStringMD5Values(const char* pStr){Init();UpDate((const TYBYTE*)pStr, (TYUINT)strlen(pStr));SetMD5Code(Digest(), 16);return m_MD5Val;}////////////////////////////////////////////////////////////////////////////const TYBYTE* CMD5::Digest(){TYBYTE bits[8];TYUINT oldState[4];TYUINT oldCount[2];TYUINT index;TYUINT padLen;/* Save current state and count. */memcpy(oldState, m_state, 16);memcpy(oldCount, m_count, 8);/* Save number of bits */EnCode(m_count, bits, 8);/* Pad out to 56 mod 64. */index = (TYUINT)((m_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(m_state, m_digest, 16);/* Restore current state and count. */memcpy(m_state, oldState, 16);memcpy(m_count, oldCount, 8);return m_digest;}

////////////////////////////////////////////////////////////////////////////测试代码#include "MD5.h"#include <iostream>using std::cout;using std::endl;int main(int argc, char** argv){CMD5 md5;cout<<md5.GetFileMD5Values("D://test.txt")<<endl;cout<<md5.GetStringMD5Values("abc")<<endl;return 0;}

 

测试结果：