220 lines
5.8 KiB
C
220 lines
5.8 KiB
C
/*
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mdfour.c
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An implementation of MD4 designed for use in the samba SMB
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authentication protocol
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Copyright (C) 1997-1998 Andrew Tridgell
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This program is free software; you can redistribute it and/or
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modify it under the terms of the GNU General Public License
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as published by the Free Software Foundation; either version 2
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of the License, or (at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
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See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to:
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Free Software Foundation, Inc.
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59 Temple Place - Suite 330
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Boston, MA 02111-1307, USA
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$Id: mdfour.c 7689 2007-11-12 14:28:40Z divverent $
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*/
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#include <string.h> /* XoXus: needed for memset call */
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#include "md4.h"
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/* NOTE: This code makes no attempt to be fast!
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It assumes that a int is at least 32 bits long
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*/
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static struct mdfour *m;
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#define F( X,Y,Z ) ( ( (X)&( Y ) ) | ( ( ~( X ) ) & ( Z ) ) )
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#define G( X,Y,Z ) ( ( (X)&( Y ) ) | ( (X)&( Z ) ) | ( (Y)&( Z ) ) )
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#define H( X,Y,Z ) ( ( X ) ^ ( Y ) ^ ( Z ) )
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#ifdef LARGE_INT32
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#define lshift( x,s ) ( ( ( ( x ) << ( s ) ) & 0xFFFFFFFF ) | ( ( ( x ) >> ( 32 - ( s ) ) ) & 0xFFFFFFFF ) )
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#else
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#define lshift( x,s ) ( ( ( x ) << ( s ) ) | ( ( x ) >> ( 32 - ( s ) ) ) )
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#endif
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#define ROUND1( a,b,c,d,k,s ) a = lshift( a + F( b,c,d ) + X[k], s )
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#define ROUND2( a,b,c,d,k,s ) a = lshift( a + G( b,c,d ) + X[k] + 0x5A827999,s )
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#define ROUND3( a,b,c,d,k,s ) a = lshift( a + H( b,c,d ) + X[k] + 0x6ED9EBA1,s )
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/* this applies md4 to 64 byte chunks */
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static void mdfour64( uint32 *M ){
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int j;
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uint32 AA, BB, CC, DD;
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uint32 X[16];
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uint32 A,B,C,D;
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for ( j = 0; j < 16; j++ )
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X[j] = M[j];
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A = m->A; B = m->B; C = m->C; D = m->D;
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AA = A; BB = B; CC = C; DD = D;
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ROUND1( A,B,C,D, 0, 3 ); ROUND1( D,A,B,C, 1, 7 );
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ROUND1( C,D,A,B, 2, 11 ); ROUND1( B,C,D,A, 3, 19 );
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ROUND1( A,B,C,D, 4, 3 ); ROUND1( D,A,B,C, 5, 7 );
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ROUND1( C,D,A,B, 6, 11 ); ROUND1( B,C,D,A, 7, 19 );
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ROUND1( A,B,C,D, 8, 3 ); ROUND1( D,A,B,C, 9, 7 );
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ROUND1( C,D,A,B, 10, 11 ); ROUND1( B,C,D,A, 11, 19 );
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ROUND1( A,B,C,D, 12, 3 ); ROUND1( D,A,B,C, 13, 7 );
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ROUND1( C,D,A,B, 14, 11 ); ROUND1( B,C,D,A, 15, 19 );
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ROUND2( A,B,C,D, 0, 3 ); ROUND2( D,A,B,C, 4, 5 );
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ROUND2( C,D,A,B, 8, 9 ); ROUND2( B,C,D,A, 12, 13 );
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ROUND2( A,B,C,D, 1, 3 ); ROUND2( D,A,B,C, 5, 5 );
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ROUND2( C,D,A,B, 9, 9 ); ROUND2( B,C,D,A, 13, 13 );
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ROUND2( A,B,C,D, 2, 3 ); ROUND2( D,A,B,C, 6, 5 );
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ROUND2( C,D,A,B, 10, 9 ); ROUND2( B,C,D,A, 14, 13 );
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ROUND2( A,B,C,D, 3, 3 ); ROUND2( D,A,B,C, 7, 5 );
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ROUND2( C,D,A,B, 11, 9 ); ROUND2( B,C,D,A, 15, 13 );
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ROUND3( A,B,C,D, 0, 3 ); ROUND3( D,A,B,C, 8, 9 );
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ROUND3( C,D,A,B, 4, 11 ); ROUND3( B,C,D,A, 12, 15 );
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ROUND3( A,B,C,D, 2, 3 ); ROUND3( D,A,B,C, 10, 9 );
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ROUND3( C,D,A,B, 6, 11 ); ROUND3( B,C,D,A, 14, 15 );
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ROUND3( A,B,C,D, 1, 3 ); ROUND3( D,A,B,C, 9, 9 );
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ROUND3( C,D,A,B, 5, 11 ); ROUND3( B,C,D,A, 13, 15 );
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ROUND3( A,B,C,D, 3, 3 ); ROUND3( D,A,B,C, 11, 9 );
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ROUND3( C,D,A,B, 7, 11 ); ROUND3( B,C,D,A, 15, 15 );
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A += AA; B += BB; C += CC; D += DD;
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#ifdef LARGE_INT32
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A &= 0xFFFFFFFF; B &= 0xFFFFFFFF;
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C &= 0xFFFFFFFF; D &= 0xFFFFFFFF;
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#endif
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for ( j = 0; j < 16; j++ )
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X[j] = 0;
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m->A = A; m->B = B; m->C = C; m->D = D;
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}
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static void copy64( uint32 *M, unsigned char *in ){
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int i;
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for ( i = 0; i < 16; i++ )
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M[i] = ( in[i * 4 + 3] << 24 ) | ( in[i * 4 + 2] << 16 ) |
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( in[i * 4 + 1] << 8 ) | ( in[i * 4 + 0] << 0 );
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}
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static void copy4( unsigned char *out,uint32 x ){
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out[0] = x & 0xFF;
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out[1] = ( x >> 8 ) & 0xFF;
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out[2] = ( x >> 16 ) & 0xFF;
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out[3] = ( x >> 24 ) & 0xFF;
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}
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void mdfour_begin( struct mdfour *md ){
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md->A = 0x67452301;
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md->B = 0xefcdab89;
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md->C = 0x98badcfe;
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md->D = 0x10325476;
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md->totalN = 0;
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}
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static void mdfour_tail( unsigned char *in, int n ){
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unsigned char buf[128];
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uint32 M[16];
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uint32 b;
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m->totalN += n;
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b = m->totalN * 8;
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memset( buf, 0, 128 );
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if ( n ) {
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memcpy( buf, in, n );
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}
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buf[n] = 0x80;
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if ( n <= 55 ) {
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copy4( buf + 56, b );
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copy64( M, buf );
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mdfour64( M );
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}
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else {
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copy4( buf + 120, b );
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copy64( M, buf );
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mdfour64( M );
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copy64( M, buf + 64 );
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mdfour64( M );
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}
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}
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void mdfour_update( struct mdfour *md, unsigned char *in, int n ){
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uint32 M[16];
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// start of edit by Forest 'LordHavoc' Hale
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// commented out to prevent crashing when length is 0
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// if (n == 0) mdfour_tail(in, n);
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// end of edit by Forest 'LordHavoc' Hale
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m = md;
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while ( n >= 64 ) {
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copy64( M, in );
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mdfour64( M );
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in += 64;
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n -= 64;
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m->totalN += 64;
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}
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mdfour_tail( in, n );
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}
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void mdfour_result( struct mdfour *md, unsigned char *out ){
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m = md;
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copy4( out, m->A );
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copy4( out + 4, m->B );
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copy4( out + 8, m->C );
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copy4( out + 12, m->D );
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}
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void mdfour( unsigned char *out, unsigned char *in, int n ){
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struct mdfour md;
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mdfour_begin( &md );
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mdfour_update( &md, in, n );
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mdfour_result( &md, out );
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}
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///////////////////////////////////////////////////////////////
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// MD4-based checksum utility functions
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//
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// Copyright (C) 2000 Jeff Teunissen <d2deek@pmail.net>
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//
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// Author: Jeff Teunissen <d2deek@pmail.net>
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// Date: 01 Jan 2000
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unsigned Com_BlockChecksum( void *buffer, int length ){
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int digest[4];
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unsigned val;
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mdfour( (unsigned char *) digest, (unsigned char *) buffer, length );
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val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
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return val;
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}
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void Com_BlockFullChecksum( void *buffer, int len, unsigned char *outbuf ){
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mdfour( outbuf, (unsigned char *) buffer, len );
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}
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