C++的MD5加密
<pre name="code" class="cpp">
#ifndef _MD5_H
#define _MD5_H
#pragma warning(disable:4786)
#include <string>
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 int
struct 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 buffer
void GenerateMD5(unsigned char* buffer,size_t bufferlen);
//! construct a CMD5
CMD5();
//! construct a md5src from char *
CMD5(const char * md5src);
//! construct a CMD5 from a 16 bytes md5
CMD5(unsigned long* md5src);
//! add a other md5
CMD5 operator +(CMD5 adder);
//! just if equal
bool operator ==(CMD5 cmper);
//! give the value from equer
// void operator =(CMD5 equer);
//! to a string
string ToString();
unsigned long m_data[4];
};
#endif /* md5.h */
#include "stdafx.h"
#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];
