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/* md4.cpp
*
* Copyright (C) 2003 Sawtooth Consulting Ltd.
*
* This file is part of yaSSL.
*
* yaSSL is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* There are special exceptions to the terms and conditions of the GPL as it
* is applied to yaSSL. View the full text of the exception in the file
* FLOSS-EXCEPTIONS in the directory of this software distribution.
*
* yaSSL is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
*/
/* based on Wei Dai's md4.cpp from CryptoPP */
#include "runtime.hpp"
#include "md4.hpp"
#include STL_ALGORITHM_FILE
namespace STL = STL_NAMESPACE;
namespace TaoCrypt {
void MD4::Init()
{
digest_[0] = 0x67452301L;
digest_[1] = 0xefcdab89L;
digest_[2] = 0x98badcfeL;
digest_[3] = 0x10325476L;
buffLen_ = 0;
loLen_ = 0;
hiLen_ = 0;
}
MD4::MD4(const MD4& that) : HASHwithTransform(DIGEST_SIZE / sizeof(word32),
BLOCK_SIZE)
{
buffLen_ = that.buffLen_;
loLen_ = that.loLen_;
hiLen_ = that.hiLen_;
memcpy(digest_, that.digest_, DIGEST_SIZE);
memcpy(buffer_, that.buffer_, BLOCK_SIZE);
}
MD4& MD4::operator= (const MD4& that)
{
MD4 tmp(that);
Swap(tmp);
return *this;
}
void MD4::Swap(MD4& other)
{
STL::swap(loLen_, other.loLen_);
STL::swap(hiLen_, other.hiLen_);
STL::swap(buffLen_, other.buffLen_);
memcpy(digest_, other.digest_, DIGEST_SIZE);
memcpy(buffer_, other.buffer_, BLOCK_SIZE);
}
void MD4::Transform()
{
#define F(x, y, z) ((z) ^ ((x) & ((y) ^ (z))))
#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
#define H(x, y, z) ((x) ^ (y) ^ (z))
word32 A, B, C, D;
A = digest_[0];
B = digest_[1];
C = digest_[2];
D = digest_[3];
#define function(a,b,c,d,k,s) a=rotlFixed(a+F(b,c,d)+buffer_[k],s);
function(A,B,C,D, 0, 3);
function(D,A,B,C, 1, 7);
function(C,D,A,B, 2,11);
function(B,C,D,A, 3,19);
function(A,B,C,D, 4, 3);
function(D,A,B,C, 5, 7);
function(C,D,A,B, 6,11);
function(B,C,D,A, 7,19);
function(A,B,C,D, 8, 3);
function(D,A,B,C, 9, 7);
function(C,D,A,B,10,11);
function(B,C,D,A,11,19);
function(A,B,C,D,12, 3);
function(D,A,B,C,13, 7);
function(C,D,A,B,14,11);
function(B,C,D,A,15,19);
#undef function
#define function(a,b,c,d,k,s) a=rotlFixed(a+G(b,c,d)+buffer_[k]+0x5a827999,s);
function(A,B,C,D, 0, 3);
function(D,A,B,C, 4, 5);
function(C,D,A,B, 8, 9);
function(B,C,D,A,12,13);
function(A,B,C,D, 1, 3);
function(D,A,B,C, 5, 5);
function(C,D,A,B, 9, 9);
function(B,C,D,A,13,13);
function(A,B,C,D, 2, 3);
function(D,A,B,C, 6, 5);
function(C,D,A,B,10, 9);
function(B,C,D,A,14,13);
function(A,B,C,D, 3, 3);
function(D,A,B,C, 7, 5);
function(C,D,A,B,11, 9);
function(B,C,D,A,15,13);
#undef function
#define function(a,b,c,d,k,s) a=rotlFixed(a+H(b,c,d)+buffer_[k]+0x6ed9eba1,s);
function(A,B,C,D, 0, 3);
function(D,A,B,C, 8, 9);
function(C,D,A,B, 4,11);
function(B,C,D,A,12,15);
function(A,B,C,D, 2, 3);
function(D,A,B,C,10, 9);
function(C,D,A,B, 6,11);
function(B,C,D,A,14,15);
function(A,B,C,D, 1, 3);
function(D,A,B,C, 9, 9);
function(C,D,A,B, 5,11);
function(B,C,D,A,13,15);
function(A,B,C,D, 3, 3);
function(D,A,B,C,11, 9);
function(C,D,A,B, 7,11);
function(B,C,D,A,15,15);
digest_[0] += A;
digest_[1] += B;
digest_[2] += C;
digest_[3] += D;
}
} // namespace
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