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#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "md5.h"
// This is a fun macro that tells us where the length char goes after the data
// section in the padded data segment. It's short for OBfuscation LOCaction.
#define OBLOC(len) ((((len + 64) >> 9) << 4) + 14)
// This performs a wrapping bitwise shift, kinda' fun!
#define bit_roll( num, cnt ) \
(((num) << (cnt)) | (((num) >> (32 - (cnt))) & ~(-1<<(cnt))))
//#define md5_cmn( q, a, b, x, s, t ) (bit_roll((a + q + x + t), s) + b)
// The following are handy wrappers for the cmn function
#define md5_ff( a, b, c, d, x, s, t ) \
(md5_cmn((b & c) | ((~b) & d), a, b, x, s, t))
#define md5_gg( a, b, c, d, x, s, t ) \
(md5_cmn((b & d) | (c & (~d)), a, b, x, s, t))
#define md5_hh( a, b, c, d, x, s, t ) \
(md5_cmn(b ^ c ^ d, a, b, x, s, t))
#define md5_ii( a, b, c, d, x, s, t ) \
(md5_cmn(c ^ (b | (~d)), a, b, x, s, t))
inline long md5_cmn( long q, long a, long b, long x, long s, long t )
{
return bit_roll((a + q + x + t), s) + b;
}
md5::md5()
{
}
md5::~md5()
{
}
/*
* Calculate the MD5 of an array of little-endian words, and a bit length
*/
void md5::core_md5( long *x, long len, md5sum *output )
{
long a = 1732584193, olda;
long b = -271733879, oldb;
long c = -1732584194, oldc;
long d = 271733878, oldd;
for( long i = 0; i < len; i += 16 )
{
olda = a;
oldb = b;
oldc = c;
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 = a + olda;
b = b + oldb;
c = c + oldc;
d = d + oldd;
}
output->data[0] = a;
output->data[1] = b;
output->data[2] = c;
output->data[3] = d;
delete[] x;
}
long *md5::c2l( const char *str, long len, long *nNewLen )
{
long len8 = len*8;
long mlen = OBLOC( len8 );
long flen = (((mlen/16)+((mlen%16)?(1):(0))))*16;
long *aBin = new long[flen];
memset( aBin, 0, flen );
for( long i = 0; i < len8; i+=8 )
{
aBin[i>>5] |= ((long)str[i/8]) << (i%32);
}
aBin[len8 >> 5] |= 0x80 << ((len8) % 32);
aBin[OBLOC( len8 )] = len8;
(*nNewLen) = flen;
return aBin;
}
void md5::l2hexstr( long *binarray, char *str )
{
static const char hex_tab[] = {"0123456789abcdef"};
//static char str[33];
int k = 0;
for( int i = 0; i < 16; i++)
{
str[k++] = hex_tab[(binarray[i>>2] >> ((i%4)*8+4)) & 0xF];
str[k++] = hex_tab[(binarray[i>>2] >> ((i%4)*8 )) & 0xF];
}
}
void md5::sumString( md5sum *pSum, const char *sStr )
{
sumData( pSum, sStr, strlen( sStr ) );
}
void md5::sumData( md5sum *pSum, const char *aData, long nLen )
{
long nNewLen;
long *aOb = c2l( aData, nLen, &nNewLen );
core_md5( aOb, nNewLen, pSum );
}
void md5::sumToHex( md5sum *pSum, char *sHex )
{
l2hexstr( pSum->data, sHex );
}
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