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/*
* Copyright (C) 2007-2010 Xagasoft, All rights reserved.
*
* This file is part of the libbu++ library and is released under the
* terms of the license contained in the file LICENSE.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include "bu/md5.h"
#include "bu/stream.h"
// 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;
}
Bu::Md5::Md5()
{
reset();
}
Bu::Md5::~Md5()
{
}
void Bu::Md5::reset()
{
// These are the magic seed numbers...
sum[0] = 1732584193;
sum[1] = -271733879;
sum[2] = -1732584194;
sum[3] = 271733878;
iBytes = 0;
memset( inbuf, 0, 4*16 );
iFill = 0;
}
void Bu::Md5::setSalt( const Bu::FString & /*sSalt*/ )
{
}
void Bu::Md5::addData( const void *sVData, int iSize )
{
const char *sData = (const char *)sVData;
int iInPos = 0;
for(;;)
{
for( ; iFill < 16*4 && iInPos < iSize; iFill++, iInPos++ )
{
inbuf[iFill>>2] |= ((long)sData[iInPos]) << ((iFill*8)%32);
}
if( iFill < 16*4 )
break;
compBlock( inbuf, sum );
memset( inbuf, 0, 4*16 );
iFill = 0;
}
iBytes += iSize;
}
Bu::FString Bu::Md5::getResult()
{
long lsum[4];
compCap( lsum );
return Bu::FString( (const char *)lsum, 4*4 );
}
void Bu::Md5::writeResult( Bu::Stream &sOut )
{
long lsum[4];
compCap( lsum );
sOut.write( lsum, 4*4 );
}
void Bu::Md5::compCap( long *sumout )
{
memcpy( sumout, sum, 4*4 );
long lbuf[16];
memcpy( lbuf, inbuf, 4*16 );
lbuf[iFill>>2] |= 0x80 << ((iFill*8)%32);
uint64_t iBits = iBytes*8;
if( iBytes > 0 && iFill>>2 >= 14 )
{
compBlock( lbuf, sumout );
memset( lbuf, 0, 4*16 );
memcpy( lbuf+14, &iBits, 8 );
compBlock( lbuf, sumout );
}
else
{
memcpy( lbuf+14, &iBits, 8 );
compBlock( lbuf, sumout );
}
}
void Bu::Md5::compBlock( long *x, long *lsum )
{
long a = lsum[0];
long b = lsum[1];
long c = lsum[2];
long d = lsum[3];
a = md5_ff(a, b, c, d, x[ 0], 7 , -680876936);
d = md5_ff(d, a, b, c, x[ 1], 12, -389564586);
c = md5_ff(c, d, a, b, x[ 2], 17, 606105819);
b = md5_ff(b, c, d, a, x[ 3], 22, -1044525330);
a = md5_ff(a, b, c, d, x[ 4], 7 , -176418897);
d = md5_ff(d, a, b, c, x[ 5], 12, 1200080426);
c = md5_ff(c, d, a, b, x[ 6], 17, -1473231341);
b = md5_ff(b, c, d, a, x[ 7], 22, -45705983);
a = md5_ff(a, b, c, d, x[ 8], 7 , 1770035416);
d = md5_ff(d, a, b, c, x[ 9], 12, -1958414417);
c = md5_ff(c, d, a, b, x[10], 17, -42063);
b = md5_ff(b, c, d, a, x[11], 22, -1990404162);
a = md5_ff(a, b, c, d, x[12], 7 , 1804603682);
d = md5_ff(d, a, b, c, x[13], 12, -40341101);
c = md5_ff(c, d, a, b, x[14], 17, -1502002290);
b = md5_ff(b, c, d, a, x[15], 22, 1236535329);
a = md5_gg(a, b, c, d, x[ 1], 5 , -165796510);
d = md5_gg(d, a, b, c, x[ 6], 9 , -1069501632);
c = md5_gg(c, d, a, b, x[11], 14, 643717713);
b = md5_gg(b, c, d, a, x[ 0], 20, -373897302);
a = md5_gg(a, b, c, d, x[ 5], 5 , -701558691);
d = md5_gg(d, a, b, c, x[10], 9 , 38016083);
c = md5_gg(c, d, a, b, x[15], 14, -660478335);
b = md5_gg(b, c, d, a, x[ 4], 20, -405537848);
a = md5_gg(a, b, c, d, x[ 9], 5 , 568446438);
d = md5_gg(d, a, b, c, x[14], 9 , -1019803690);
c = md5_gg(c, d, a, b, x[ 3], 14, -187363961);
b = md5_gg(b, c, d, a, x[ 8], 20, 1163531501);
a = md5_gg(a, b, c, d, x[13], 5 , -1444681467);
d = md5_gg(d, a, b, c, x[ 2], 9 , -51403784);
c = md5_gg(c, d, a, b, x[ 7], 14, 1735328473);
b = md5_gg(b, c, d, a, x[12], 20, -1926607734);
a = md5_hh(a, b, c, d, x[ 5], 4 , -378558);
d = md5_hh(d, a, b, c, x[ 8], 11, -2022574463);
c = md5_hh(c, d, a, b, x[11], 16, 1839030562);
b = md5_hh(b, c, d, a, x[14], 23, -35309556);
a = md5_hh(a, b, c, d, x[ 1], 4 , -1530992060);
d = md5_hh(d, a, b, c, x[ 4], 11, 1272893353);
c = md5_hh(c, d, a, b, x[ 7], 16, -155497632);
b = md5_hh(b, c, d, a, x[10], 23, -1094730640);
a = md5_hh(a, b, c, d, x[13], 4 , 681279174);
d = md5_hh(d, a, b, c, x[ 0], 11, -358537222);
c = md5_hh(c, d, a, b, x[ 3], 16, -722521979);
b = md5_hh(b, c, d, a, x[ 6], 23, 76029189);
a = md5_hh(a, b, c, d, x[ 9], 4 , -640364487);
d = md5_hh(d, a, b, c, x[12], 11, -421815835);
c = md5_hh(c, d, a, b, x[15], 16, 530742520);
b = md5_hh(b, c, d, a, x[ 2], 23, -995338651);
a = md5_ii(a, b, c, d, x[ 0], 6 , -198630844);
d = md5_ii(d, a, b, c, x[ 7], 10, 1126891415);
c = md5_ii(c, d, a, b, x[14], 15, -1416354905);
b = md5_ii(b, c, d, a, x[ 5], 21, -57434055);
a = md5_ii(a, b, c, d, x[12], 6 , 1700485571);
d = md5_ii(d, a, b, c, x[ 3], 10, -1894986606);
c = md5_ii(c, d, a, b, x[10], 15, -1051523);
b = md5_ii(b, c, d, a, x[ 1], 21, -2054922799);
a = md5_ii(a, b, c, d, x[ 8], 6 , 1873313359);
d = md5_ii(d, a, b, c, x[15], 10, -30611744);
c = md5_ii(c, d, a, b, x[ 6], 15, -1560198380);
b = md5_ii(b, c, d, a, x[13], 21, 1309151649);
a = md5_ii(a, b, c, d, x[ 4], 6 , -145523070);
d = md5_ii(d, a, b, c, x[11], 10, -1120210379);
c = md5_ii(c, d, a, b, x[ 2], 15, 718787259);
b = md5_ii(b, c, d, a, x[ 9], 21, -343485551);
lsum[0] = a + lsum[0];
lsum[1] = b + lsum[1];
lsum[2] = c + lsum[2];
lsum[3] = d + lsum[3];
}
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