mirror of
https://github.com/id-Software/DOOM-3-BFG.git
synced 2024-12-11 05:01:25 +00:00
281 lines
8.4 KiB
C++
281 lines
8.4 KiB
C++
|
|
#pragma hdrstop
|
|
#include "precompiled.h"
|
|
|
|
/*
|
|
RSA Data Security, Inc., MD4 message-digest algorithm. (RFC1320)
|
|
*/
|
|
|
|
/*
|
|
|
|
Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
|
|
rights reserved.
|
|
|
|
License to copy and use this software is granted provided that it
|
|
is identified as the "RSA Data Security, Inc. MD4 Message-Digest
|
|
Algorithm" in all material mentioning or referencing this software
|
|
or this function.
|
|
|
|
License is also granted to make and use derivative works provided
|
|
that such works are identified as "derived from the RSA Data
|
|
Security, Inc. MD4 Message-Digest Algorithm" in all material
|
|
mentioning or referencing the derived work.
|
|
|
|
RSA Data Security, Inc. makes no representations concerning either
|
|
the merchantability of this software or the suitability of this
|
|
software for any particular purpose. It is provided "as is"
|
|
without express or implied warranty of any kind.
|
|
|
|
These notices must be retained in any copies of any part of this
|
|
documentation and/or software.
|
|
|
|
*/
|
|
|
|
/* POINTER defines a generic pointer type */
|
|
typedef unsigned char* POINTER;
|
|
|
|
/* UINT2 defines a two byte word */
|
|
typedef unsigned short int UINT2;
|
|
|
|
/* UINT4 defines a four byte word */
|
|
// RB: 64 bit fix, changed long int to int
|
|
typedef unsigned int UINT4;
|
|
// RB end
|
|
|
|
|
|
/* MD4 context. */
|
|
typedef struct
|
|
{
|
|
UINT4 state[4]; /* state (ABCD) */
|
|
UINT4 count[2]; /* number of bits, modulo 2^64 (lsb first) */
|
|
unsigned char buffer[64]; /* input buffer */
|
|
} MD4_CTX;
|
|
|
|
/* Constants for MD4Transform routine. */
|
|
#define S11 3
|
|
#define S12 7
|
|
#define S13 11
|
|
#define S14 19
|
|
#define S21 3
|
|
#define S22 5
|
|
#define S23 9
|
|
#define S24 13
|
|
#define S31 3
|
|
#define S32 9
|
|
#define S33 11
|
|
#define S34 15
|
|
|
|
static unsigned char PADDING[64] =
|
|
{
|
|
0x80, 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
|
|
};
|
|
|
|
/* F, G and H are basic MD4 functions. */
|
|
#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
|
|
#define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z)))
|
|
#define H(x, y, z) ((x) ^ (y) ^ (z))
|
|
|
|
/* ROTATE_LEFT rotates x left n bits. */
|
|
#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
|
|
|
|
/* FF, GG and HH are transformations for rounds 1, 2 and 3 */
|
|
/* Rotation is separate from addition to prevent recomputation */
|
|
#define FF(a, b, c, d, x, s) {(a) += F ((b), (c), (d)) + (x); (a) = ROTATE_LEFT ((a), (s));}
|
|
|
|
#define GG(a, b, c, d, x, s) {(a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; (a) = ROTATE_LEFT ((a), (s));}
|
|
|
|
#define HH(a, b, c, d, x, s) {(a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; (a) = ROTATE_LEFT ((a), (s));}
|
|
|
|
/* Encodes input (UINT4) into output (unsigned char). Assumes len is a multiple of 4. */
|
|
static void Encode( unsigned char* output, UINT4* input, unsigned int len )
|
|
{
|
|
unsigned int i, j;
|
|
|
|
for( i = 0, j = 0; j < len; i++, j += 4 )
|
|
{
|
|
output[j] = ( unsigned char )( input[i] & 0xff );
|
|
output[j + 1] = ( unsigned char )( ( input[i] >> 8 ) & 0xff );
|
|
output[j + 2] = ( unsigned char )( ( input[i] >> 16 ) & 0xff );
|
|
output[j + 3] = ( unsigned char )( ( input[i] >> 24 ) & 0xff );
|
|
}
|
|
}
|
|
|
|
/* Decodes input (unsigned char) into output (UINT4). Assumes len is a multiple of 4. */
|
|
static void Decode( UINT4* output, const unsigned char* input, unsigned int len )
|
|
{
|
|
unsigned int i, j;
|
|
|
|
for( i = 0, j = 0; j < len; i++, j += 4 )
|
|
{
|
|
output[i] = ( ( UINT4 )input[j] ) | ( ( ( UINT4 )input[j + 1] ) << 8 ) | ( ( ( UINT4 )input[j + 2] ) << 16 ) | ( ( ( UINT4 )input[j + 3] ) << 24 );
|
|
}
|
|
}
|
|
|
|
/* MD4 basic transformation. Transforms state based on block. */
|
|
static void MD4_Transform( UINT4 state[4], const unsigned char block[64] )
|
|
{
|
|
UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16];
|
|
|
|
Decode( x, block, 64 );
|
|
|
|
/* Round 1 */
|
|
FF( a, b, c, d, x[ 0], S11 ); /* 1 */
|
|
FF( d, a, b, c, x[ 1], S12 ); /* 2 */
|
|
FF( c, d, a, b, x[ 2], S13 ); /* 3 */
|
|
FF( b, c, d, a, x[ 3], S14 ); /* 4 */
|
|
FF( a, b, c, d, x[ 4], S11 ); /* 5 */
|
|
FF( d, a, b, c, x[ 5], S12 ); /* 6 */
|
|
FF( c, d, a, b, x[ 6], S13 ); /* 7 */
|
|
FF( b, c, d, a, x[ 7], S14 ); /* 8 */
|
|
FF( a, b, c, d, x[ 8], S11 ); /* 9 */
|
|
FF( d, a, b, c, x[ 9], S12 ); /* 10 */
|
|
FF( c, d, a, b, x[10], S13 ); /* 11 */
|
|
FF( b, c, d, a, x[11], S14 ); /* 12 */
|
|
FF( a, b, c, d, x[12], S11 ); /* 13 */
|
|
FF( d, a, b, c, x[13], S12 ); /* 14 */
|
|
FF( c, d, a, b, x[14], S13 ); /* 15 */
|
|
FF( b, c, d, a, x[15], S14 ); /* 16 */
|
|
|
|
/* Round 2 */
|
|
GG( a, b, c, d, x[ 0], S21 ); /* 17 */
|
|
GG( d, a, b, c, x[ 4], S22 ); /* 18 */
|
|
GG( c, d, a, b, x[ 8], S23 ); /* 19 */
|
|
GG( b, c, d, a, x[12], S24 ); /* 20 */
|
|
GG( a, b, c, d, x[ 1], S21 ); /* 21 */
|
|
GG( d, a, b, c, x[ 5], S22 ); /* 22 */
|
|
GG( c, d, a, b, x[ 9], S23 ); /* 23 */
|
|
GG( b, c, d, a, x[13], S24 ); /* 24 */
|
|
GG( a, b, c, d, x[ 2], S21 ); /* 25 */
|
|
GG( d, a, b, c, x[ 6], S22 ); /* 26 */
|
|
GG( c, d, a, b, x[10], S23 ); /* 27 */
|
|
GG( b, c, d, a, x[14], S24 ); /* 28 */
|
|
GG( a, b, c, d, x[ 3], S21 ); /* 29 */
|
|
GG( d, a, b, c, x[ 7], S22 ); /* 30 */
|
|
GG( c, d, a, b, x[11], S23 ); /* 31 */
|
|
GG( b, c, d, a, x[15], S24 ); /* 32 */
|
|
|
|
/* Round 3 */
|
|
HH( a, b, c, d, x[ 0], S31 ); /* 33 */
|
|
HH( d, a, b, c, x[ 8], S32 ); /* 34 */
|
|
HH( c, d, a, b, x[ 4], S33 ); /* 35 */
|
|
HH( b, c, d, a, x[12], S34 ); /* 36 */
|
|
HH( a, b, c, d, x[ 2], S31 ); /* 37 */
|
|
HH( d, a, b, c, x[10], S32 ); /* 38 */
|
|
HH( c, d, a, b, x[ 6], S33 ); /* 39 */
|
|
HH( b, c, d, a, x[14], S34 ); /* 40 */
|
|
HH( a, b, c, d, x[ 1], S31 ); /* 41 */
|
|
HH( d, a, b, c, x[ 9], S32 ); /* 42 */
|
|
HH( c, d, a, b, x[ 5], S33 ); /* 43 */
|
|
HH( b, c, d, a, x[13], S34 ); /* 44 */
|
|
HH( a, b, c, d, x[ 3], S31 ); /* 45 */
|
|
HH( d, a, b, c, x[11], S32 ); /* 46 */
|
|
HH( c, d, a, b, x[ 7], S33 ); /* 47 */
|
|
HH( b, c, d, a, x[15], S34 ); /* 48 */
|
|
|
|
state[0] += a;
|
|
state[1] += b;
|
|
state[2] += c;
|
|
state[3] += d;
|
|
|
|
/* Zeroize sensitive information.*/
|
|
memset( ( POINTER )x, 0, sizeof( x ) );
|
|
}
|
|
|
|
/* MD4 initialization. Begins an MD4 operation, writing a new context. */
|
|
void MD4_Init( MD4_CTX* context )
|
|
{
|
|
context->count[0] = context->count[1] = 0;
|
|
|
|
/* Load magic initialization constants.*/
|
|
context->state[0] = 0x67452301;
|
|
context->state[1] = 0xefcdab89;
|
|
context->state[2] = 0x98badcfe;
|
|
context->state[3] = 0x10325476;
|
|
}
|
|
|
|
/* MD4 block update operation. Continues an MD4 message-digest operation, processing another message block, and updating the context. */
|
|
void MD4_Update( MD4_CTX* context, const unsigned char* input, unsigned int inputLen )
|
|
{
|
|
unsigned int i, index, partLen;
|
|
|
|
/* Compute number of bytes mod 64 */
|
|
index = ( unsigned int )( ( context->count[0] >> 3 ) & 0x3F );
|
|
|
|
/* Update number of bits */
|
|
if( ( context->count[0] += ( ( UINT4 )inputLen << 3 ) ) < ( ( UINT4 )inputLen << 3 ) )
|
|
{
|
|
context->count[1]++;
|
|
}
|
|
|
|
context->count[1] += ( ( UINT4 )inputLen >> 29 );
|
|
|
|
partLen = 64 - index;
|
|
|
|
/* Transform as many times as possible.*/
|
|
if( inputLen >= partLen )
|
|
{
|
|
memcpy( ( POINTER )&context->buffer[index], ( POINTER )input, partLen );
|
|
MD4_Transform( context->state, context->buffer );
|
|
|
|
for( i = partLen; i + 63 < inputLen; i += 64 )
|
|
{
|
|
MD4_Transform( context->state, &input[i] );
|
|
}
|
|
|
|
index = 0;
|
|
}
|
|
else
|
|
{
|
|
i = 0;
|
|
}
|
|
|
|
/* Buffer remaining input */
|
|
memcpy( ( POINTER )&context->buffer[index], ( POINTER )&input[i], inputLen - i );
|
|
}
|
|
|
|
/* MD4 finalization. Ends an MD4 message-digest operation, writing the message digest and zeroizing the context. */
|
|
void MD4_Final( MD4_CTX* context, unsigned char digest[16] )
|
|
{
|
|
unsigned char bits[8];
|
|
unsigned int index, padLen;
|
|
|
|
/* Save number of bits */
|
|
Encode( bits, context->count, 8 );
|
|
|
|
/* Pad out to 56 mod 64.*/
|
|
index = ( unsigned int )( ( context->count[0] >> 3 ) & 0x3f );
|
|
padLen = ( index < 56 ) ? ( 56 - index ) : ( 120 - index );
|
|
MD4_Update( context, PADDING, padLen );
|
|
|
|
/* Append length (before padding) */
|
|
MD4_Update( context, bits, 8 );
|
|
|
|
/* Store state in digest */
|
|
Encode( digest, context->state, 16 );
|
|
|
|
/* Zeroize sensitive information.*/
|
|
memset( ( POINTER )context, 0, sizeof( *context ) );
|
|
}
|
|
|
|
/*
|
|
===============
|
|
MD4_BlockChecksum
|
|
===============
|
|
*/
|
|
// RB: 64 bit fixes, changed long to int
|
|
unsigned int MD4_BlockChecksum( const void* data, int length )
|
|
{
|
|
unsigned int digest[4];
|
|
unsigned int val;
|
|
MD4_CTX ctx;
|
|
|
|
MD4_Init( &ctx );
|
|
MD4_Update( &ctx, ( unsigned char* )data, length );
|
|
MD4_Final( &ctx, ( unsigned char* )digest );
|
|
|
|
val = digest[0] ^ digest[1] ^ digest[2] ^ digest[3];
|
|
|
|
return val;
|
|
}
|
|
// RB end
|
|
|