實現md5演算法的封裝類
//md5.h
#ifndef _lgy_md5_h
#define _lgy_md5_h
/* md5 class. */
class md5_ctx ;
#endif
//md5.cpp
#include "stdafx.h"
#include "md5.h"
/* 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)
#define gg(a, b, c, d, x, s, ac)
#define hh(a, b, c, d, x, s, ac)
#define ii(a, b, c, d, x, s, ac)
/* md5 initialization. begins an md5 operation, writing a new context.
*/md5_ctx::md5_ctx()
md5_ctx::~md5_ctx()
void md5_ctx::md5init ();}
/* md5 block update operation. continues an md5 message-digest
operation, processing another message block, and updating the
context.
*/void md5_ctx::md5update (unsigned char *input,unsigned int inputlen)
else
i = 0;
/* buffer remaining input */
md5_memcpy ((unsigned char*)&this->buffer[index], (unsigned char*)&input[i], inputlen-i);
}/* md5 basic transformation. transforms state based on block.
*/void md5_ctx::md5transform (unsigned long int state[4], unsigned char block[64])
/* encodes input (unsigned long int) into output (unsigned char). assumes len is
a multiple of 4.
*/void md5_ctx::encode (unsigned char *output, unsigned long int *input,unsigned int len)
}/* decodes input (unsigned char) into output (unsigned long int). assumes len is
a multiple of 4.
*/void md5_ctx::decode (unsigned long int *output, unsigned char *input, unsigned int len)
/* note: replace "for loop" with standard memcpy if possible.
*/void md5_ctx::md5_memcpy (unsigned char* output, unsigned char* input,unsigned int len)
/* note: replace "for loop" with standard memset if possible.
*/void md5_ctx::md5_memset (unsigned char* output,int value,unsigned int len)
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