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