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项目开发中需要c/c++版本的md5算法，在网上找了一个代码例子，并做了测试，代码如下：
md5代码：
头文件
#ifndef MD5_H
#define MD5_H
typedef struct
{
unsigned int count[2];
unsigned int state[4];
unsigned char buffer[64];
}MD5_CTX;
#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 > (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;\
}
void MD5Init(MD5_CTX *context);
void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputlen);
void MD5Final(MD5_CTX *context, unsigned char digest[16]);
void MD5Transform(unsigned int state[4], unsigned char block[64]);
void MD5Encode(unsigned char *output, unsigned int *input, unsigned int len);
void MD5Decode(unsigned int *output, unsigned char *input, unsigned int len);
#endif
.cpp文件
#include
#include "md5.h"
unsigned char PADDING[] = { 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 MD5Init(MD5_CTX *context)
{
context->count[0] = 0;
context->count[1] = 0;
context->state[0] = 0x67452301;
context->state[1] = 0xEFCDAB89;
context->state[2] = 0x98BADCFE;
context->state[3] = 0x10325476;
}
void MD5Update(MD5_CTX *context, unsigned char *input, unsigned int inputlen)
{
unsigned int i = 0, index = 0, partlen = 0;
index = (context->count[0] >> 3) & 0x3F;
partlen = 64 - index;
context->count[0] += inputlen count[0] < (inputlen count[1]++;
context->count[1] += inputlen >> 29;
if (inputlen >= partlen)
{
memcpy(&context->buffer[index], input, partlen);
MD5Transform(context->state, context->buffer);
for (i = partlen; i + 64 state, &input[i]);
index = 0;
}
else
{
i = 0;
}
memcpy(&context->buffer[index], &input[i], inputlen - i);
}
void MD5Final(MD5_CTX *context, unsigned char digest[16])
{
unsigned int index = 0, padlen = 0;
unsigned char bits[8];
index = (context->count[0] >> 3) & 0x3F;
padlen = (index < 56) ? (56 - index) : (120 - index);
MD5Encode(bits, context->count, 8);
MD5Update(context, PADDING, padlen);
MD5Update(context, bits, 8);
MD5Encode(digest, context->state, 16);
}
void MD5Encode(unsigned char *output, unsigned int *input, unsigned int len)
{
unsigned int i = 0, j = 0;
while (j < len)
{
output[j] = input[i] & 0xFF;
output[j + 1] = (input[i] >> 8) & 0xFF;
output[j + 2] = (input[i] >> 16) & 0xFF;
output[j + 3] = (input[i] >> 24) & 0xFF;
i++;
j += 4;
}
}
void MD5Decode(unsigned int *output, unsigned char *input, unsigned int len)
{
unsigned int i = 0, j = 0;
while (j < len)
{
output[i] = (input[j]) |
(input[j + 1] |