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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 <string.h>
#include "bu/stream.h"
#include "bu/sha1.h"
Bu::Sha1::Sha1() :
uH0( 0x67452301 ),
uH1( 0xefcdab89 ),
uH2( 0x98badcfe ),
uH3( 0x10325476 ),
uH4( 0xc3d2e1f0 ),
iUnprocessedBytes( 0 ),
uTotalBytes( 0 )
{
reset();
}
Bu::Sha1::~Sha1()
{
}
void Bu::Sha1::reset()
{
uH0 = 0x67452301;
uH1 = 0xefcdab89;
uH2 = 0x98badcfe;
uH3 = 0x10325476;
uH4 = 0xc3d2e1f0;
iUnprocessedBytes = 0;
uTotalBytes = 0;
}
void Bu::Sha1::setSalt( const Bu::FString & /*sSalt*/ )
{
}
void Bu::Sha1::addData( const void *sDataRaw, int iSize )
{
const unsigned char *sData = (const unsigned char *)sDataRaw;
// add these bytes to the running total
uTotalBytes += iSize;
// repeat until all data is processed
while( iSize > 0 )
{
// number of bytes required to complete block
int iNeeded = 64 - iUnprocessedBytes;
// number of bytes to copy (use smaller of two)
int iToCopy = (iSize < iNeeded) ? iSize : iNeeded;
// Copy the bytes
memcpy( uBytes + iUnprocessedBytes, sData, iToCopy );
// Bytes have been copied
iSize -= iToCopy;
sData += iToCopy;
iUnprocessedBytes += iToCopy;
// there is a full block
if( iUnprocessedBytes == 64 )
{
process();
}
}
}
Bu::FString Bu::Sha1::getResult()
{
// save the message size
uint32_t totalBitsL = uTotalBytes << 3;
uint32_t totalBitsH = uTotalBytes >> 29;
// add 0x80 to the message
addData( "\x80", 1 );
unsigned char footer[64] = {
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, 0 };
// block has no room for 8-byte filesize, so finish it
if( iUnprocessedBytes > 56 )
addData( (char*)footer, 64 - iUnprocessedBytes);
// how many zeros do we need
int iNeededZeros = 56 - iUnprocessedBytes;
// store file size (in bits) in big-endian format
toBigEndian( totalBitsH, footer + iNeededZeros );
toBigEndian( totalBitsL, footer + iNeededZeros + 4 );
// finish the final block
addData( (char*)footer, iNeededZeros + 8 );
Bu::FString sRet( 20 );
unsigned char *digest = (unsigned char *)sRet.getStr();
// copy the digest bytes
toBigEndian( uH0, digest );
toBigEndian( uH1, digest + 4 );
toBigEndian( uH2, digest + 8 );
toBigEndian( uH3, digest + 12 );
toBigEndian( uH4, digest + 16 );
// return the digest
return sRet;
}
void Bu::Sha1::writeResult( Bu::Stream &sOut )
{
sOut.write( getResult() );
}
void Bu::Sha1::process()
{
int t;
uint32_t a, b, c, d, e, K, f, W[80];
// starting values
a = uH0;
b = uH1;
c = uH2;
d = uH3;
e = uH4;
// copy and expand the message block
for( t = 0; t < 16; t++ ) W[t] = (uBytes[t*4] << 24)
+(uBytes[t*4 + 1] << 16)
+(uBytes[t*4 + 2] << 8)
+ uBytes[t*4 + 3];
for(; t< 80; t++ ) W[t] = lrot( W[t-3]^W[t-8]^W[t-14]^W[t-16], 1 );
/* main loop */
uint32_t temp;
for( t = 0; t < 80; t++ )
{
if( t < 20 ) {
K = 0x5a827999;
f = (b & c) | ((~b) & d);
} else if( t < 40 ) {
K = 0x6ed9eba1;
f = b ^ c ^ d;
} else if( t < 60 ) {
K = 0x8f1bbcdc;
f = (b & c) | (b & d) | (c & d);
} else {
K = 0xca62c1d6;
f = b ^ c ^ d;
}
temp = lrot(a,5) + f + e + W[t] + K;
e = d;
d = c;
c = lrot(b,30);
b = a;
a = temp;
//printf( "t=%d %08x %08x %08x %08x %08x\n",t,a,b,c,d,e );
}
/* add variables */
uH0 += a;
uH1 += b;
uH2 += c;
uH3 += d;
uH4 += e;
//printf( "Current: %08x %08x %08x %08x %08x\n",H0,H1,H2,H3,H4 );
/* all bytes have been processed */
iUnprocessedBytes = 0;
}
uint32_t Bu::Sha1::lrot( uint32_t x, int bits )
{
return (x<<bits) | (x>>(32 - bits));
}
void Bu::Sha1::toBigEndian( uint32_t num, unsigned char* byte )
{
byte[0] = (unsigned char)(num>>24);
byte[1] = (unsigned char)(num>>16);
byte[2] = (unsigned char)(num>>8);
byte[3] = (unsigned char)num;
}
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