mirror of
https://github.com/TTimo/GtkRadiant.git
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285 lines
7.4 KiB
C
285 lines
7.4 KiB
C
/*
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* MD4 (RFC-1320) message digest.
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* Modified from MD5 code by Andrey Panin <pazke@donpac.ru>
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*
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* Written by Solar Designer <solar@openwall.com> in 2001, and placed in
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* the public domain. There's absolutely no warranty.
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*
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* This differs from Colin Plumb's older public domain implementation in
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* that no 32-bit integer data type is required, there's no compile-time
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* endianness configuration, and the function prototypes match OpenSSL's.
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* The primary goals are portability and ease of use.
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*
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* This implementation is meant to be fast, but not as fast as possible.
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* Some known optimizations are not included to reduce source code size
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* and avoid compile-time configuration.
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*/
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#include <stdlib.h>
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#include <string.h>
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#include "md4lib.h"
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/*
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* The basic MD4 functions.
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*/
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#define F( x, y, z ) ( ( z ) ^ ( ( x ) & ( ( y ) ^ ( 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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/*
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* The MD4 transformation for all four rounds.
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*/
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#define STEP( f, a, b, c, d, x, s ) \
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( a ) += f( ( b ), ( c ), ( d ) ) + ( x ); \
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( a ) = ( ( a ) << ( s ) ) | ( ( a ) >> ( 32 - ( s ) ) )
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/*
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* SET reads 4 input bytes in little-endian byte order and stores them
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* in a properly aligned word in host byte order.
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*
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* The check for little-endian architectures which tolerate unaligned
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* memory accesses is just an optimization. Nothing will break if it
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* doesn't work.
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*/
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#if defined( __i386__ ) || defined( __x86_64__ ) || defined( __vax__ )
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#define SET( n ) \
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( *(const uint_fast32_t *)&ptr[( n ) * 4] )
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#define GET( n ) \
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SET( n )
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#else
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#define SET( n ) \
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( ctx->block[( n )] = \
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(uint_fast32_t)ptr[( n ) * 4] | \
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( (uint_fast32_t)ptr[( n ) * 4 + 1] << 8 ) | \
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( (uint_fast32_t)ptr[( n ) * 4 + 2] << 16 ) | \
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( (uint_fast32_t)ptr[( n ) * 4 + 3] << 24 ) )
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#define GET( n ) \
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( ctx->block[( n )] )
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#endif
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/*
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* This processes one or more 64-byte data blocks, but does NOT update
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* the bit counters. There're no alignment requirements.
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*/
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static const void *body( struct md4_context *ctx, const void *data, size_t size ){
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const unsigned char *ptr;
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uint32_t a, b, c, d;
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uint32_t saved_a, saved_b, saved_c, saved_d;
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ptr = data;
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a = ctx->a;
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b = ctx->b;
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c = ctx->c;
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d = ctx->d;
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do {
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saved_a = a;
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saved_b = b;
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saved_c = c;
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saved_d = d;
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/* Round 1 */
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STEP( F, a, b, c, d, SET( 0 ), 3 );
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STEP( F, d, a, b, c, SET( 1 ), 7 );
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STEP( F, c, d, a, b, SET( 2 ), 11 );
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STEP( F, b, c, d, a, SET( 3 ), 19 );
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STEP( F, a, b, c, d, SET( 4 ), 3 );
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STEP( F, d, a, b, c, SET( 5 ), 7 );
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STEP( F, c, d, a, b, SET( 6 ), 11 );
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STEP( F, b, c, d, a, SET( 7 ), 19 );
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STEP( F, a, b, c, d, SET( 8 ), 3 );
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STEP( F, d, a, b, c, SET( 9 ), 7 );
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STEP( F, c, d, a, b, SET( 10 ), 11 );
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STEP( F, b, c, d, a, SET( 11 ), 19 );
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STEP( F, a, b, c, d, SET( 12 ), 3 );
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STEP( F, d, a, b, c, SET( 13 ), 7 );
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STEP( F, c, d, a, b, SET( 14 ), 11 );
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STEP( F, b, c, d, a, SET( 15 ), 19 );
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/* Round 2 */
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STEP( G, a, b, c, d, GET( 0 ) + 0x5A827999, 3 );
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STEP( G, d, a, b, c, GET( 4 ) + 0x5A827999, 5 );
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STEP( G, c, d, a, b, GET( 8 ) + 0x5A827999, 9 );
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STEP( G, b, c, d, a, GET( 12 ) + 0x5A827999, 13 );
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STEP( G, a, b, c, d, GET( 1 ) + 0x5A827999, 3 );
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STEP( G, d, a, b, c, GET( 5 ) + 0x5A827999, 5 );
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STEP( G, c, d, a, b, GET( 9 ) + 0x5A827999, 9 );
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STEP( G, b, c, d, a, GET( 13 ) + 0x5A827999, 13 );
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STEP( G, a, b, c, d, GET( 2 ) + 0x5A827999, 3 );
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STEP( G, d, a, b, c, GET( 6 ) + 0x5A827999, 5 );
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STEP( G, c, d, a, b, GET( 10 ) + 0x5A827999, 9 );
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STEP( G, b, c, d, a, GET( 14 ) + 0x5A827999, 13 );
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STEP( G, a, b, c, d, GET( 3 ) + 0x5A827999, 3 );
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STEP( G, d, a, b, c, GET( 7 ) + 0x5A827999, 5 );
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STEP( G, c, d, a, b, GET( 11 ) + 0x5A827999, 9 );
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STEP( G, b, c, d, a, GET( 15 ) + 0x5A827999, 13 );
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/* Round 3 */
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STEP( H, a, b, c, d, GET( 0 ) + 0x6ED9EBA1, 3 );
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STEP( H, d, a, b, c, GET( 8 ) + 0x6ED9EBA1, 9 );
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STEP( H, c, d, a, b, GET( 4 ) + 0x6ED9EBA1, 11 );
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STEP( H, b, c, d, a, GET( 12 ) + 0x6ED9EBA1, 15 );
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STEP( H, a, b, c, d, GET( 2 ) + 0x6ED9EBA1, 3 );
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STEP( H, d, a, b, c, GET( 10 ) + 0x6ED9EBA1, 9 );
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STEP( H, c, d, a, b, GET( 6 ) + 0x6ED9EBA1, 11 );
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STEP( H, b, c, d, a, GET( 14 ) + 0x6ED9EBA1, 15 );
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STEP( H, a, b, c, d, GET( 1 ) + 0x6ED9EBA1, 3 );
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STEP( H, d, a, b, c, GET( 9 ) + 0x6ED9EBA1, 9 );
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STEP( H, c, d, a, b, GET( 5 ) + 0x6ED9EBA1, 11 );
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STEP( H, b, c, d, a, GET( 13 ) + 0x6ED9EBA1, 15 );
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STEP( H, a, b, c, d, GET( 3 ) + 0x6ED9EBA1, 3 );
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STEP( H, d, a, b, c, GET( 11 ) + 0x6ED9EBA1, 9 );
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STEP( H, c, d, a, b, GET( 7 ) + 0x6ED9EBA1, 11 );
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STEP( H, b, c, d, a, GET( 15 ) + 0x6ED9EBA1, 15 );
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a += saved_a;
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b += saved_b;
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c += saved_c;
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d += saved_d;
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ptr += 64;
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} while ( size -= 64 );
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ctx->a = a;
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ctx->b = b;
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ctx->c = c;
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ctx->d = d;
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return ptr;
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}
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void md4_init( struct md4_context *ctx ){
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ctx->a = 0x67452301;
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ctx->b = 0xefcdab89;
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ctx->c = 0x98badcfe;
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ctx->d = 0x10325476;
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ctx->lo = 0;
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ctx->hi = 0;
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}
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void md4_update( struct md4_context *ctx, const void *data, size_t size ){
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/* @UNSAFE */
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uint_fast32_t saved_lo;
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unsigned long used, free;
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saved_lo = ctx->lo;
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if ( ( ctx->lo = ( saved_lo + size ) & 0x1fffffff ) < saved_lo ) {
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ctx->hi++;
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}
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ctx->hi += size >> 29;
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used = saved_lo & 0x3f;
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if ( used ) {
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free = 64 - used;
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if ( size < free ) {
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memcpy( &ctx->buffer[used], data, size );
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return;
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}
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memcpy( &ctx->buffer[used], data, free );
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data = (const unsigned char *) data + free;
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size -= free;
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body( ctx, ctx->buffer, 64 );
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}
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if ( size >= 64 ) {
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data = body( ctx, data, size & ~(unsigned long)0x3f );
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size &= 0x3f;
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}
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memcpy( ctx->buffer, data, size );
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}
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void md4_final( struct md4_context *ctx, unsigned char result[MD4_RESULTLEN] ){
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/* @UNSAFE */
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unsigned long used, free;
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used = ctx->lo & 0x3f;
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ctx->buffer[used++] = 0x80;
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free = 64 - used;
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if ( free < 8 ) {
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memset( &ctx->buffer[used], 0, free );
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body( ctx, ctx->buffer, 64 );
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used = 0;
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free = 64;
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}
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memset( &ctx->buffer[used], 0, free - 8 );
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ctx->lo <<= 3;
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ctx->buffer[56] = ctx->lo;
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ctx->buffer[57] = ctx->lo >> 8;
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ctx->buffer[58] = ctx->lo >> 16;
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ctx->buffer[59] = ctx->lo >> 24;
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ctx->buffer[60] = ctx->hi;
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ctx->buffer[61] = ctx->hi >> 8;
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ctx->buffer[62] = ctx->hi >> 16;
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ctx->buffer[63] = ctx->hi >> 24;
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body( ctx, ctx->buffer, 64 );
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result[0] = ctx->a;
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result[1] = ctx->a >> 8;
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result[2] = ctx->a >> 16;
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result[3] = ctx->a >> 24;
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result[4] = ctx->b;
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result[5] = ctx->b >> 8;
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result[6] = ctx->b >> 16;
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result[7] = ctx->b >> 24;
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result[8] = ctx->c;
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result[9] = ctx->c >> 8;
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result[10] = ctx->c >> 16;
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result[11] = ctx->c >> 24;
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result[12] = ctx->d;
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result[13] = ctx->d >> 8;
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result[14] = ctx->d >> 16;
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result[15] = ctx->d >> 24;
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memset( ctx, 0, sizeof( *ctx ) );
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}
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void md4_get_digest( const void *data, size_t size,
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unsigned char result[MD4_RESULTLEN] ){
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struct md4_context ctx;
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md4_init( &ctx );
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md4_update( &ctx, data, size );
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md4_final( &ctx, result );
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}
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static void hash_method_init_md4( void *context ){
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md4_init( context );
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}
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static void hash_method_loop_md4( void *context, const void *data, size_t size ){
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md4_update( context, data, size );
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}
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static void hash_method_result_md4( void *context, unsigned char *result_r ){
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md4_final( context, result_r );
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}
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const struct hash_method hash_method_md4 = {
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"md4",
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sizeof( struct md4_context ),
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MD4_RESULTLEN,
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hash_method_init_md4,
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hash_method_loop_md4,
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hash_method_result_md4
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};
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