封装好的C++ md5类

博客转载自：http://blog.csdn.net/lindexi_gd/article/details/47005093

在网上看到很多md5类，不过封好的很少，我就在网上看到一篇把他写的封装

头文件 md5.h

#ifndef _MD5_H
#define _MD5_H#pragma warning(disable:4786)//来逗下#include <string>
#include <string.h>
using namespace std;struct MD5_DATA
{unsigned long data[4];bool operator < (const MD5_DATA& p) const{return memcmp(data,p.data,4*sizeof(long))>0;}
};class CMD5
{
private:#define uint8  unsigned char#define uint32 unsigned long intstruct md5_context{uint32 total[2];uint32 state[4];uint8 buffer[64];};void md5_starts( struct md5_context *ctx );void md5_process( struct md5_context *ctx, uint8 data[64] );void md5_update( struct md5_context *ctx, uint8 *input, size_t length );void md5_finish( struct md5_context *ctx, uint8 digest[16] );public://! construct a CMD5 from any buffervoid GenerateMD5(unsigned char* buffer,size_t bufferlen);//! to str md5string md5(string str);//! construct a CMD5CMD5();//! construct a md5src from char *CMD5(const char * md5src);//! construct a CMD5 from a 16 bytes md5CMD5(unsigned long* md5src);//! add a other md5CMD5 operator +(CMD5 adder);//! just if equalbool operator ==(CMD5 cmper);//! give the value from equer// void operator =(CMD5 equer);//! to a stringstring ToString();unsigned long m_data[4];
};
#endif /* md5.h */

具体实现代码

#include "md5.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>#define GET_UINT32(n,b,i)  (n) = (uint32) ((uint8 *) b)[(i)] | (((uint32) ((uint8 *) b)[(i)+1]) <<  8) | (((uint32) ((uint8 *) b)[(i)+2]) << 16) | (((uint32) ((uint8 *) b)[(i)+3]) << 24);#define PUT_UINT32(n,b,i) (((uint8 *) b)[(i)]  ) = (uint8) (((n)) & 0xFF); (((uint8 *) b)[(i)+1]) = (uint8) (((n) >>  8) & 0xFF);  (((uint8 *) b)[(i)+2]) = (uint8) (((n) >> 16) & 0xFF);  (((uint8 *) b)[(i)+3]) = (uint8) (((n) >> 24) & 0xFF);void CMD5::md5_starts( struct md5_context *ctx )
{ctx->total[0] = 0;ctx->total[1] = 0;ctx->state[0] = 0x67452301;ctx->state[1] = 0xEFCDAB89;ctx->state[2] = 0x98BADCFE;ctx->state[3] = 0x10325476;
}void CMD5::md5_process( struct md5_context *ctx, uint8 data[64] )
{uint32 A, B, C, D, X[16];GET_UINT32( X[0],  data,  0 );GET_UINT32( X[1],  data,  4 );GET_UINT32( X[2],  data,  8 );GET_UINT32( X[3],  data, 12 );GET_UINT32( X[4],  data, 16 );GET_UINT32( X[5],  data, 20 );GET_UINT32( X[6],  data, 24 );GET_UINT32( X[7],  data, 28 );GET_UINT32( X[8],  data, 32 );GET_UINT32( X[9],  data, 36 );GET_UINT32( X[10], data, 40 );GET_UINT32( X[11], data, 44 );GET_UINT32( X[12], data, 48 );GET_UINT32( X[13], data, 52 );GET_UINT32( X[14], data, 56 );GET_UINT32( X[15], data, 60 );#define S(x,n) ((x << n) | ((x & 0xFFFFFFFF) >> (32 - n)))#define P(a,b,c,d,k,s,t) a += F(b,c,d) + X[k] + t; a = S(a,s) + b;A = ctx->state[0];B = ctx->state[1];C = ctx->state[2];D = ctx->state[3];#define F(x,y,z) (z ^ (x & (y ^ z)))P( A, B, C, D,  0,  7, 0xD76AA478 );P( D, A, B, C,  1, 12, 0xE8C7B756 );P( C, D, A, B,  2, 17, 0x242070DB );P( B, C, D, A,  3, 22, 0xC1BDCEEE );P( A, B, C, D,  4,  7, 0xF57C0FAF );P( D, A, B, C,  5, 12, 0x4787C62A );P( C, D, A, B,  6, 17, 0xA8304613 );P( B, C, D, A,  7, 22, 0xFD469501 );P( A, B, C, D,  8,  7, 0x698098D8 );P( D, A, B, C,  9, 12, 0x8B44F7AF );P( C, D, A, B, 10, 17, 0xFFFF5BB1 );P( B, C, D, A, 11, 22, 0x895CD7BE );P( A, B, C, D, 12,  7, 0x6B901122 );P( D, A, B, C, 13, 12, 0xFD987193 );P( C, D, A, B, 14, 17, 0xA679438E );P( B, C, D, A, 15, 22, 0x49B40821 );#undef F#define F(x,y,z) (y ^ (z & (x ^ y)))P( A, B, C, D,  1,  5, 0xF61E2562 );P( D, A, B, C,  6,  9, 0xC040B340 );P( C, D, A, B, 11, 14, 0x265E5A51 );P( B, C, D, A,  0, 20, 0xE9B6C7AA );P( A, B, C, D,  5,  5, 0xD62F105D );P( D, A, B, C, 10,  9, 0x02441453 );P( C, D, A, B, 15, 14, 0xD8A1E681 );P( B, C, D, A,  4, 20, 0xE7D3FBC8 );P( A, B, C, D,  9,  5, 0x21E1CDE6 );P( D, A, B, C, 14,  9, 0xC33707D6 );P( C, D, A, B,  3, 14, 0xF4D50D87 );P( B, C, D, A,  8, 20, 0x455A14ED );P( A, B, C, D, 13,  5, 0xA9E3E905 );P( D, A, B, C,  2,  9, 0xFCEFA3F8 );P( C, D, A, B,  7, 14, 0x676F02D9 );P( B, C, D, A, 12, 20, 0x8D2A4C8A );#undef F#define F(x,y,z) (x ^ y ^ z)P( A, B, C, D,  5,  4, 0xFFFA3942 );P( D, A, B, C,  8, 11, 0x8771F681 );P( C, D, A, B, 11, 16, 0x6D9D6122 );P( B, C, D, A, 14, 23, 0xFDE5380C );P( A, B, C, D,  1,  4, 0xA4BEEA44 );P( D, A, B, C,  4, 11, 0x4BDECFA9 );P( C, D, A, B,  7, 16, 0xF6BB4B60 );P( B, C, D, A, 10, 23, 0xBEBFBC70 );P( A, B, C, D, 13,  4, 0x289B7EC6 );P( D, A, B, C,  0, 11, 0xEAA127FA );P( C, D, A, B,  3, 16, 0xD4EF3085 );P( B, C, D, A,  6, 23, 0x04881D05 );P( A, B, C, D,  9,  4, 0xD9D4D039 );P( D, A, B, C, 12, 11, 0xE6DB99E5 );P( C, D, A, B, 15, 16, 0x1FA27CF8 );P( B, C, D, A,  2, 23, 0xC4AC5665 );#undef F#define F(x,y,z) (y ^ (x | ~z))P( A, B, C, D,  0,  6, 0xF4292244 );P( D, A, B, C,  7, 10, 0x432AFF97 );P( C, D, A, B, 14, 15, 0xAB9423A7 );P( B, C, D, A,  5, 21, 0xFC93A039 );P( A, B, C, D, 12,  6, 0x655B59C3 );P( D, A, B, C,  3, 10, 0x8F0CCC92 );P( C, D, A, B, 10, 15, 0xFFEFF47D );P( B, C, D, A,  1, 21, 0x85845DD1 );P( A, B, C, D,  8,  6, 0x6FA87E4F );P( D, A, B, C, 15, 10, 0xFE2CE6E0 );P( C, D, A, B,  6, 15, 0xA3014314 );P( B, C, D, A, 13, 21, 0x4E0811A1 );P( A, B, C, D,  4,  6, 0xF7537E82 );P( D, A, B, C, 11, 10, 0xBD3AF235 );P( C, D, A, B,  2, 15, 0x2AD7D2BB );P( B, C, D, A,  9, 21, 0xEB86D391 );#undef Fctx->state[0] += A;ctx->state[1] += B;ctx->state[2] += C;ctx->state[3] += D;
}void CMD5::md5_update( struct md5_context *ctx, uint8 *input, size_t length )
{uint32 left, fill;if( ! length ) return;left = ( ctx->total[0] >> 3 ) & 0x3F;fill = 64 - left;ctx->total[0] += length <<  3;ctx->total[1] += length >> 29;ctx->total[0] &= 0xFFFFFFFF;ctx->total[1] += ctx->total[0] < length << 3;if( left && length >= fill ){memcpy( (void *) (ctx->buffer + left), (void *) input, fill );md5_process( ctx, ctx->buffer );length -= fill;input  += fill;left = 0;}while( length >= 64 ){md5_process( ctx, input );length -= 64;input  += 64;}if( length ){memcpy( (void *) (ctx->buffer + left), (void *) input, length );}
}static uint8 md5_padding[64] =
{0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
};void CMD5::md5_finish( struct md5_context *ctx, uint8 digest[16] )
{uint32 last, padn;uint8 msglen[8];PUT_UINT32( ctx->total[0], msglen, 0 );PUT_UINT32( ctx->total[1], msglen, 4 );last = ( ctx->total[0] >> 3 ) & 0x3F;padn = ( last < 56 ) ? ( 56 - last ) : ( 120 - last );md5_update( ctx, md5_padding, padn );md5_update( ctx, msglen, 8 );PUT_UINT32( ctx->state[0], digest,  0 );PUT_UINT32( ctx->state[1], digest,  4 );PUT_UINT32( ctx->state[2], digest,  8 );PUT_UINT32( ctx->state[3], digest, 12 );
}void CMD5::GenerateMD5(unsigned char* buffer,size_t bufferlen)
{struct md5_context context;md5_starts (&context);md5_update (&context, buffer, bufferlen);md5_finish (&context,(unsigned char*)m_data);
}string CMD5::md5(string str)
{unsigned char *p=(unsigned char *)str.data();GenerateMD5(p,str.length());return ToString();
}CMD5::CMD5()
{for(int i=0;i<4;i++)m_data[i]=0;
}CMD5::CMD5(unsigned long* md5src)
{memcpy(m_data,md5src,16);
}
int _httoi(const char *value)
{struct CHexMap{char chr;int value;};const int HexMapL = 16;CHexMap HexMap[HexMapL] ={{'0', 0}, {'1', 1},{'2', 2}, {'3', 3},{'4', 4}, {'5', 5},{'6', 6}, {'7', 7},{'8', 8}, {'9', 9},{'a', 10}, {'b', 11},{'c', 12}, {'d', 13},{'e', 14}, {'f', 15}};char *mstr = strdup(value);char *s = mstr;int result = 0;if (*s == '0' && *(s + 1) == 'X') s += 2;bool firsttime = true;while (*s != '/0'){bool found = false;for (int i = 0; i < HexMapL; i++){if (*s == HexMap[i].chr){if (!firsttime) result <<= 4;result |= HexMap[i].value;found = true;break;}}if (!found) break;s++;firsttime = false;}free(mstr);return result;
}CMD5::CMD5(const char* md5src)
{if (strcmp(md5src,"")==0){for(int i=0;i<4;i++)m_data[i]=0;return;}for(int j = 0; j < 16; j++ ){char buf[10];strncpy(buf,md5src,2);md5src+=2;((unsigned char*)m_data)[j] = _httoi(buf);}
}CMD5 CMD5::operator +(CMD5 adder)
{unsigned long m_newdata[4];for(int i=0;i<4;i++)m_newdata[i]=m_data[i]^(adder.m_data[i]);return CMD5(m_newdata);
}bool CMD5::operator ==(CMD5 cmper)
{return (memcmp(cmper.m_data ,m_data,16)==0);
}//void CMD5::operator =(CMD5 equer)
//{
// memcpy(m_data,equer.m_data ,16);
//}string CMD5::ToString()
{char output[33];for(int j = 0; j < 16; j++ ){sprintf( output + j * 2, "%02x", ((unsigned char*)m_data)[j]);}return string(output);
}

使用方法：

#include <iostream>
#include "md5.h"
using namespace std;int main()
{string str("asd3b1S2Bib2suygf1dfgdfgiaehfofnviehiusvbvisauefviuhsiduf");char *p=(char *)str.data();CMD5 md5;md5.GenerateMD5((unsigned char *)p,str.length());cout << md5.ToString() << endl;cout << md5.md5(str) << endl;return 0;
}

我做的就是更改里面.h没有

#include <string.h>

出现memcpy错误
增加 md5(string str)
参考 http://blog.csdn.net/lzwxyz/article/details/6443336

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