原创 与php md5算法完全一致的C语言版 王泽宾收藏

gaohan

　　看到很多同学搜寻md5算法，我特意根据php的md5算法写了一个c语言版本，如果大家感兴趣，
　　可以尽情的使用，通过本算法生成的md5摘要，与php的md5函数的结果完全相同。
　　/**
* MD5制作函数，兼容PHP
* @author wangzebin
　　*/
　　#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
　　/*
* Convert an array of little-endian words to a hex string.
*/
int binl2hex( int *src, char *dst, int nsize)
{
if( src == 0 )
return 1;
　　if( dst == 0 )
return 1;
　　if( nsize < 32 )
return 1;
　　
char hex_tab[] = "0123456789abcdef";
　　int j = 0;
for(int i = 0; i < 16; i++)
{
dst[j++] = hex_tab[(src[i>>2] >> ((i%4)*8+4)) & 0xF];
　　syslog(LOG_DEBUG,"end:%c-%d-%d-%d",dst[j-1],(src[i>>2] >> ((i%4)*8+4)),((i%4)*8+4),src[i>>2]);
　　
dst[j++] = hex_tab[(src[i>>2] >> ((i%4)*8 )) & 0xF];
syslog(LOG_DEBUG,"end:%c-%d-%d-%d",dst[j-1],(src[i>>2] >> ((i%4)*8+4)),((i%4)*8+4),src[i>>2]);
}
dst[j] = 0;
return 0;
}
　　/*
* Convert a string to an array of little-endian words
* If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
*/
int str2binl(char * src,int *pndst, int nsize)
{
if(src == 0)
return 1;
　　if(pndst == 0)
return 1;
　　int nloop = strlen(src) * 8;
if( (nloop >> 5) >= nsize )
return 1;
　　for(int i=0; i<nsize; i++ )
pndst = 0;
　　int mask = (1 << 8) - 1;
　　for(int i = 0; i < nloop; i += 8)
{
pndst[i>>5] |= ( src[i / 8] & mask) << (i%32);
}
　　return 0;
}
　　/*
* Add integers, wrapping at 2^32.
*/
int safe_add(int x, int y)
{
int lsw = (x & 0xFFFF) + (y & 0xFFFF);
int msw = (x >> 16) + (y >> 16) + (lsw >> 16);
return (msw << 16) | (lsw & 0xFFFF);
}
　　/*
* Bitwise rotate a 32-bit number to the left.
*/
int bit_rol(unsigned int num, unsigned int cnt)
{
//old
// return (num << cnt) | (num >>> (32 - cnt));
return (num << cnt) | (num >> (32 - cnt));
}
　　/*
* These functions implement the four basic operations the algorithm uses.
*/
int md5_cmn(int q, int a, int b, int x, int s, int t)
{
return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
}
int md5_ff( int a, int b, int c, int d, int x, int s, int t)
{
return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
}
int md5_gg( int a, int b, int c, int d, int x, int s, int t)
{
return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
}
int md5_hh( int a, int b, int c, int d, int x, int s, int t)
{
return md5_cmn(b ^ c ^ d, a, b, x, s, t);
}
int md5_ii( int a, int b, int c, int d, int x, int s, int t)
{
return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
}
　　/*
* Calculate the MD5 of an array of little-endian words, and a bit length
*/
int core_md5( int *x, int len, int * dst)
{
if( x == 0)
return 1;
　　if( len <= 0 )
return 1;
　　if (dst == 0)
return 1;
　　/* append padding */
x[len >> 5] |= 0x80 << ((len) % 32);
　　syslog(LOG_DEBUG,"x[len >> 5]:%d",x[len >> 5]);
//old
//--x[(((len + 64) >>> 9) << 4) + 14] = len;
　　unsigned int ntemp = len + 64;
x[(((ntemp) >> 9) << 4) + 14] = len;
syslog(LOG_DEBUG,"x[(((ntemp) >> 9) << 4) + 14]:%d",x[(((ntemp) >> 9) << 4) + 14]);
　　int a = 1732584193;
int b = -271733879;
int c = -1732584194;
int d = 271733878;

int ncurrlen = (((ntemp) >> 9) << 4) + 14 + 1;
for(int i = 0; i < ncurrlen; i += 16)
{
int olda = a;
int oldb = b;
int oldc = c;
int oldd = d;
　　a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
c = md5_ff(c, d, a, b, x[i+ 2], 17, 606105819);
b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
　　a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
d = md5_ff(d, a, b, c, x[i+ 5], 12, 1200080426);
c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
　　
a = md5_ff(a, b, c, d, x[i+ 8], 7 , 1770035416);
d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
　　a = md5_ff(a, b, c, d, x[i+12], 7 , 1804603682);
d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
b = md5_ff(b, c, d, a, x[i+15], 22, 1236535329);
　　
a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
c = md5_gg(c, d, a, b, x[i+11], 14, 643717713);
b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
　　a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
d = md5_gg(d, a, b, c, x[i+10], 9 , 38016083);
c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
　　a = md5_gg(a, b, c, d, x[i+ 9], 5 , 568446438);
d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
b = md5_gg(b, c, d, a, x[i+ 8], 20, 1163531501);
　　a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
c = md5_gg(c, d, a, b, x[i+ 7], 14, 1735328473);
b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);
　　a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
c = md5_hh(c, d, a, b, x[i+11], 16, 1839030562);
b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
　　a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
d = md5_hh(d, a, b, c, x[i+ 4], 11, 1272893353);
c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
　　a = md5_hh(a, b, c, d, x[i+13], 4 , 681279174);
d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
b = md5_hh(b, c, d, a, x[i+ 6], 23, 76029189);
　　a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
c = md5_hh(c, d, a, b, x[i+15], 16, 530742520);
b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);
　　a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
d = md5_ii(d, a, b, c, x[i+ 7], 10, 1126891415);
c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
　　a = md5_ii(a, b, c, d, x[i+12], 6 , 1700485571);
d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
　　a = md5_ii(a, b, c, d, x[i+ 8], 6 , 1873313359);
d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
b = md5_ii(b, c, d, a, x[i+13], 21, 1309151649);
　　a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
c = md5_ii(c, d, a, b, x[i+ 2], 15, 718787259);
b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);
　　a = safe_add(a, olda);
b = safe_add(b, oldb);
c = safe_add(c, oldc);
d = safe_add(d, oldd);
}
　　dst[0] =a;
dst[1] =b;
dst[2] =c;
dst[3] =d;
　　
return 0;
　　}
　　/*
* This is the function you'll usually want to call
* They take string arguments and return either hex or base-64 encoded strings
*/
int hex_md5( char *src, char *dst, int nsize)
{
if( dst == 0 )
return 1;
　　if( nsize < 32 )
return 1;
　　int nbuffsize1 = ((strlen(src) * 8) >> 5) + 1;
int nbuffsize2 = (((strlen(src) * 8 + 64) >> 9) << 4) + 15;
　　
int nbuffsize = nbuffsize1 > nbuffsize2 ? nbuffsize1 : nbuffsize2;
　　int* buff = new int[nbuffsize];
if( buff == 0 )
return 1;
　　
int ptemp[4];
for(int i=0; i<4; i++)
{
*ptemp = 0;
}
　　if( str2binl(src,buff,nbuffsize) == 1 )
{
delete buff;
return 1;
}
　　if( core_md5(buff,strlen(src) * 8, ptemp ) == 1)
{
delete buff;
return 1;
}
　　delete buff;
　　if( binl2hex(ptemp, dst, 32) == 1)
{
syslog(LOG_DEBUG,"error");
return 1;
}
　　return 0;
}
　　//for example:input a string and get a md5 string.
/*
int main()
{
char src[1024];
char md5[32] = {0};
　　strcpy(src,"1234");
　　hex_md5(src, md5, 32);
　　printf("/nmd5:%s/n",md5);
　　return 0;
}*/