mirror of
https://github.com/id-Software/DOOM-3-BFG.git
synced 2024-12-11 05:01:25 +00:00
259 lines
8.1 KiB
C++
259 lines
8.1 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 */
|
|
typedef unsigned long int UINT4;
|
|
|
|
/* 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
|
|
===============
|
|
*/
|
|
unsigned long MD4_BlockChecksum( const void *data, int length ) {
|
|
unsigned long digest[4];
|
|
unsigned long 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;
|
|
}
|