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smb/smbval/md4.c  view on Meta::CPAN

/* 
   Unix SMB/Netbios implementation.
   Version 1.9.
   a implementation of MD4 designed for use in the SMB authentication protocol
   Copyright (C) Andrew Tridgell 1997
   
   This program 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.
   
   This program 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., 675 Mass Ave, Cambridge, MA 02139, USA.
*/


/* NOTE: This code makes no attempt to be fast! 

   It assumes that a int is at least 32 bits long
*/
#include <string.h>

typedef unsigned int uint32;

static uint32 A, B, C, D;

static uint32 F(uint32 X, uint32 Y, uint32 Z)
{
	return (X&Y) | ((~X)&Z);
}

static uint32 G(uint32 X, uint32 Y, uint32 Z)
{
	return (X&Y) | (X&Z) | (Y&Z); 
}

static uint32 H(uint32 X, uint32 Y, uint32 Z)
{
	return X^Y^Z;
}

static uint32 lshift(uint32 x, int s)
{
	x &= 0xFFFFFFFF;
	return ((x<<s)&0xFFFFFFFF) | (x>>(32-s));
}

#define ROUND1(a,b,c,d,k,s) a = lshift(a + F(b,c,d) + X[k], s)
#define ROUND2(a,b,c,d,k,s) a = lshift(a + G(b,c,d) + X[k] + (uint32)0x5A827999,s)
#define ROUND3(a,b,c,d,k,s) a = lshift(a + H(b,c,d) + X[k] + (uint32)0x6ED9EBA1,s)

/* this applies md4 to 64 byte chunks */
static void mdfour64(uint32 *M)
{
	int j;
	uint32 AA, BB, CC, DD;