297 строки
7.4 KiB
C
297 строки
7.4 KiB
C
/* md4.c - MD4 Message-Digest Algorithm
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* Copyright (C) 2002, 2003 Free Software Foundation, Inc.
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*
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* This file is part of Libgcrypt.
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*
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* Libgcrypt is free software; you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as
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* published by the Free Software Foundation; either version 2.1 of
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* the License, or (at your option) any later version.
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*
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* Libgcrypt 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. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*
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* Based on md5.c in libgcrypt, but rewritten to compute md4 checksums
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* using a public domain md4 implementation with the following comments:
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*
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* Modified by Wei Dai from Andrew M. Kuchling's md4.c
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* The original code and all modifications are in the public domain.
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*
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* This is the original introductory comment:
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*
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* md4.c : MD4 hash algorithm.
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*
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* Part of the Python Cryptography Toolkit, version 1.1
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*
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* Distribute and use freely; there are no restrictions on further
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* dissemination and usage except those imposed by the laws of your
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* country of residence.
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*
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*/
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/* MD4 test suite:
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* MD4 ("") = 31d6cfe0d16ae931b73c59d7e0c089c0
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* MD4 ("a") = bde52cb31de33e46245e05fbdbd6fb24
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* MD4 ("abc") = a448017aaf21d8525fc10ae87aa6729d
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* MD4 ("message digest") = d9130a8164549fe818874806e1c7014b
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* MD4 ("abcdefghijklmnopqrstuvwxyz") = d79e1c308aa5bbcdeea8ed63df412da9
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* MD4 ("ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789") =
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* 043f8582f241db351ce627e153e7f0e4
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* MD4 ("123456789012345678901234567890123456789012345678901234567890123456
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* 78901234567890") = e33b4ddc9c38f2199c3e7b164fcc0536
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*/
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#include <config.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include "g10lib.h"
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#include "cipher.h"
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#include "bithelp.h"
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#include "bufhelp.h"
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#include "hash-common.h"
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typedef struct {
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gcry_md_block_ctx_t bctx;
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u32 A,B,C,D; /* chaining variables */
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} MD4_CONTEXT;
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static unsigned int
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transform ( void *c, const unsigned char *data, size_t nblks );
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static void
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md4_init (void *context, unsigned int flags)
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{
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MD4_CONTEXT *ctx = context;
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(void)flags;
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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->bctx.nblocks = 0;
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ctx->bctx.nblocks_high = 0;
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ctx->bctx.count = 0;
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ctx->bctx.blocksize_shift = _gcry_ctz(64);
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ctx->bctx.bwrite = transform;
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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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* transform 64 bytes
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*/
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static unsigned int
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transform_blk ( void *c, const unsigned char *data )
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{
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MD4_CONTEXT *ctx = c;
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u32 in[16];
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register u32 A = ctx->A;
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register u32 B = ctx->B;
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register u32 C = ctx->C;
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register u32 D = ctx->D;
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int i;
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for ( i = 0; i < 16; i++ )
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in[i] = buf_get_le32(data + i * 4);
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/* Round 1. */
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#define function(a,b,c,d,k,s) a=rol(a+F(b,c,d)+in[k],s);
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function(A,B,C,D, 0, 3);
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function(D,A,B,C, 1, 7);
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function(C,D,A,B, 2,11);
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function(B,C,D,A, 3,19);
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function(A,B,C,D, 4, 3);
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function(D,A,B,C, 5, 7);
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function(C,D,A,B, 6,11);
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function(B,C,D,A, 7,19);
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function(A,B,C,D, 8, 3);
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function(D,A,B,C, 9, 7);
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function(C,D,A,B,10,11);
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function(B,C,D,A,11,19);
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function(A,B,C,D,12, 3);
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function(D,A,B,C,13, 7);
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function(C,D,A,B,14,11);
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function(B,C,D,A,15,19);
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#undef function
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/* Round 2. */
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#define function(a,b,c,d,k,s) a=rol(a+G(b,c,d)+in[k]+0x5a827999,s);
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function(A,B,C,D, 0, 3);
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function(D,A,B,C, 4, 5);
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function(C,D,A,B, 8, 9);
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function(B,C,D,A,12,13);
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function(A,B,C,D, 1, 3);
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function(D,A,B,C, 5, 5);
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function(C,D,A,B, 9, 9);
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function(B,C,D,A,13,13);
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function(A,B,C,D, 2, 3);
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function(D,A,B,C, 6, 5);
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function(C,D,A,B,10, 9);
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function(B,C,D,A,14,13);
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function(A,B,C,D, 3, 3);
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function(D,A,B,C, 7, 5);
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function(C,D,A,B,11, 9);
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function(B,C,D,A,15,13);
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#undef function
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/* Round 3. */
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#define function(a,b,c,d,k,s) a=rol(a+H(b,c,d)+in[k]+0x6ed9eba1,s);
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function(A,B,C,D, 0, 3);
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function(D,A,B,C, 8, 9);
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function(C,D,A,B, 4,11);
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function(B,C,D,A,12,15);
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function(A,B,C,D, 2, 3);
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function(D,A,B,C,10, 9);
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function(C,D,A,B, 6,11);
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function(B,C,D,A,14,15);
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function(A,B,C,D, 1, 3);
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function(D,A,B,C, 9, 9);
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function(C,D,A,B, 5,11);
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function(B,C,D,A,13,15);
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function(A,B,C,D, 3, 3);
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function(D,A,B,C,11, 9);
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function(C,D,A,B, 7,11);
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function(B,C,D,A,15,15);
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/* Put checksum in context given as argument. */
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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 /*burn_stack*/ 80+6*sizeof(void*);
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}
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static unsigned int
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transform ( void *c, const unsigned char *data, size_t nblks )
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{
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unsigned int burn;
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do
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{
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burn = transform_blk (c, data);
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data += 64;
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}
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while (--nblks);
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return burn;
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}
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/* The routine final terminates the message-digest computation and
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* ends with the desired message digest in mdContext->digest[0...15].
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* The handle is prepared for a new MD4 cycle.
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* Returns 16 bytes representing the digest.
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*/
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static void
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md4_final( void *context )
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{
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MD4_CONTEXT *hd = context;
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u32 t, th, msb, lsb;
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byte *p;
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unsigned int burn;
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t = hd->bctx.nblocks;
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if (sizeof t == sizeof hd->bctx.nblocks)
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th = hd->bctx.nblocks_high;
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else
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th = hd->bctx.nblocks >> 32;
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/* multiply by 64 to make a byte count */
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lsb = t << 6;
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msb = (th << 6) | (t >> 26);
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/* add the count */
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t = lsb;
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if( (lsb += hd->bctx.count) < t )
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msb++;
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/* multiply by 8 to make a bit count */
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t = lsb;
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lsb <<= 3;
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msb <<= 3;
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msb |= t >> 29;
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if (hd->bctx.count < 56) /* enough room */
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{
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hd->bctx.buf[hd->bctx.count++] = 0x80; /* pad */
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if (hd->bctx.count < 56)
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memset (&hd->bctx.buf[hd->bctx.count], 0, 56 - hd->bctx.count);
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/* append the 64 bit count */
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buf_put_le32(hd->bctx.buf + 56, lsb);
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buf_put_le32(hd->bctx.buf + 60, msb);
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burn = transform (hd, hd->bctx.buf, 1);
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}
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else /* need one extra block */
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{
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hd->bctx.buf[hd->bctx.count++] = 0x80; /* pad character */
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/* fill pad and next block with zeroes */
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memset (&hd->bctx.buf[hd->bctx.count], 0, 64 - hd->bctx.count + 56);
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/* append the 64 bit count */
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buf_put_le32(hd->bctx.buf + 64 + 56, lsb);
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buf_put_le32(hd->bctx.buf + 64 + 60, msb);
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burn = transform (hd, hd->bctx.buf, 2);
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}
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p = hd->bctx.buf;
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#define X(a) do { buf_put_le32(p, hd->a); p += 4; } while(0)
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X(A);
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X(B);
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X(C);
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X(D);
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#undef X
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hd->bctx.count = 0;
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_gcry_burn_stack (burn);
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}
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static byte *
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md4_read (void *context)
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{
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MD4_CONTEXT *hd = context;
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return hd->bctx.buf;
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}
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static byte asn[18] = /* Object ID is 1.2.840.113549.2.4 */
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{ 0x30, 0x20, 0x30, 0x0c, 0x06, 0x08, 0x2a, 0x86,0x48,
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0x86, 0xf7, 0x0d, 0x02, 0x04, 0x05, 0x00, 0x04, 0x10 };
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static gcry_md_oid_spec_t oid_spec_md4[] =
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{
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/* iso.member-body.us.rsadsi.digestAlgorithm.md4 */
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{ "1.2.840.113549.2.4" },
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{ NULL },
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};
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gcry_md_spec_t _gcry_digest_spec_md4 =
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{
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GCRY_MD_MD4, {0, 0},
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"MD4", asn, DIM (asn), oid_spec_md4,16,
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md4_init, _gcry_md_block_write, md4_final, md4_read, NULL,
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NULL, NULL,
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sizeof (MD4_CONTEXT)
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};
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