a6ed8e06b8
git-svn-id: svn://svn.h5l.se/heimdal/trunk/heimdal@1991 ec53bebd-3082-4978-b11e-865c3cabbd6b
270 lines
6.2 KiB
C
270 lines
6.2 KiB
C
/*
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* Copyright (c) 1995, 1996, 1997 Kungliga Tekniska Högskolan
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* (Royal Institute of Technology, Stockholm, Sweden).
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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*
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* 3. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the Kungliga Tekniska
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* Högskolan and its contributors.
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*
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* 4. Neither the name of the Institute nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#ifdef HAVE_CONFIG_H
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#include "config.h"
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RCSID("$Id$");
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#endif
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#include <stdlib.h>
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#include <string.h>
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#include "md4.h"
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#ifndef min
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#define min(a,b) (((a)>(b))?(b):(a))
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#endif
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#define A m->counter[0]
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#define B m->counter[1]
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#define C m->counter[2]
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#define D m->counter[3]
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#define X data
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void
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md4_init (struct md4 *m)
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{
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m->offset = 0;
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m->sz = 0;
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D = 0x10325476;
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C = 0x98badcfe;
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B = 0xefcdab89;
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A = 0x67452301;
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}
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static u_int32_t
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cshift (u_int32_t x, unsigned n)
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{
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return (x << n) | (x >> (32 - n));
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}
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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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#define DOIT(a,b,c,d,k,s,i,OP) \
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a = cshift(a + OP(b,c,d) + X[k] + i, s)
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#define DO1(a,b,c,d,k,s,i) DOIT(a,b,c,d,k,s,i,F)
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#define DO2(a,b,c,d,k,s,i) DOIT(a,b,c,d,k,s,i,G)
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#define DO3(a,b,c,d,k,s,i) DOIT(a,b,c,d,k,s,i,H)
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static void
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calc (struct md4 *m, u_int32_t *data)
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{
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u_int32_t AA, BB, CC, DD;
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AA = A;
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BB = B;
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CC = C;
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DD = D;
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/* Round 1 */
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DO1(A,B,C,D,0,3,0);
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DO1(D,A,B,C,1,7,0);
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DO1(C,D,A,B,2,11,0);
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DO1(B,C,D,A,3,19,0);
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DO1(A,B,C,D,4,3,0);
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DO1(D,A,B,C,5,7,0);
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DO1(C,D,A,B,6,11,0);
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DO1(B,C,D,A,7,19,0);
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DO1(A,B,C,D,8,3,0);
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DO1(D,A,B,C,9,7,0);
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DO1(C,D,A,B,10,11,0);
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DO1(B,C,D,A,11,19,0);
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DO1(A,B,C,D,12,3,0);
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DO1(D,A,B,C,13,7,0);
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DO1(C,D,A,B,14,11,0);
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DO1(B,C,D,A,15,19,0);
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/* Round 2 */
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DO2(A,B,C,D,0,3,0x5A827999);
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DO2(D,A,B,C,4,5,0x5A827999);
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DO2(C,D,A,B,8,9,0x5A827999);
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DO2(B,C,D,A,12,13,0x5A827999);
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DO2(A,B,C,D,1,3,0x5A827999);
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DO2(D,A,B,C,5,5,0x5A827999);
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DO2(C,D,A,B,9,9,0x5A827999);
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DO2(B,C,D,A,13,13,0x5A827999);
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DO2(A,B,C,D,2,3,0x5A827999);
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DO2(D,A,B,C,6,5,0x5A827999);
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DO2(C,D,A,B,10,9,0x5A827999);
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DO2(B,C,D,A,14,13,0x5A827999);
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DO2(A,B,C,D,3,3,0x5A827999);
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DO2(D,A,B,C,7,5,0x5A827999);
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DO2(C,D,A,B,11,9,0x5A827999);
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DO2(B,C,D,A,15,13,0x5A827999);
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/* Round 3 */
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DO3(A,B,C,D,0,3,0x6ED9EBA1);
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DO3(D,A,B,C,8,9,0x6ED9EBA1);
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DO3(C,D,A,B,4,11,0x6ED9EBA1);
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DO3(B,C,D,A,12,15,0x6ED9EBA1);
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DO3(A,B,C,D,2,3,0x6ED9EBA1);
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DO3(D,A,B,C,10,9,0x6ED9EBA1);
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DO3(C,D,A,B,6,11,0x6ED9EBA1);
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DO3(B,C,D,A,14,15,0x6ED9EBA1);
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DO3(A,B,C,D,1,3,0x6ED9EBA1);
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DO3(D,A,B,C,9,9,0x6ED9EBA1);
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DO3(C,D,A,B,5,11,0x6ED9EBA1);
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DO3(B,C,D,A,13,15,0x6ED9EBA1);
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DO3(A,B,C,D,3,3,0x6ED9EBA1);
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DO3(D,A,B,C,11,9,0x6ED9EBA1);
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DO3(C,D,A,B,7,11,0x6ED9EBA1);
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DO3(B,C,D,A,15,15,0x6ED9EBA1);
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A += AA;
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B += BB;
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C += CC;
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D += DD;
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}
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/*
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* From `Performance analysis of MD5' by Joseph D. Touch <touch@isi.edu>
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*/
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static u_int32_t
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swap_u_int32_t (u_int32_t t)
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{
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#if defined(WORDS_BIGENDIAN)
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#define ROL(x,n) ((x)<<(n))|((x)>>(32-(n)))
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u_int32_t temp1, temp2;
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temp1 = ROL(t,16);
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temp2 = temp1 >> 8;
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temp1 &= 0x00ff00ff;
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temp2 &= 0x00ff00ff;
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temp1 <<= 8;
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return temp1 | temp2;
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#else
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return t;
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#endif
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}
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void
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md4_update (struct md4 *m, void *v, size_t len)
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{
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u_char *p = (u_char *)v;
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m->sz += len;
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if (m->offset == 0 && len % 64 == 0)
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while (len > 0) {
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#if defined(WORDS_BIGENDIAN)
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{
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int i;
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u_int32_t *u = (u_int32_t *)p;
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for (i = 0; i < 16; ++i)
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m->current[i] = swap_u_int32_t (u[i]);
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}
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calc (m, m->current);
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#else
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calc (m, (u_int32_t *)p);
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#endif
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p += 64;
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len -= 64;
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}
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else
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while (len > 0) {
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unsigned l;
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l = min(64 - m->offset, len);
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memcpy ((char *)m->current + m->offset, p, l);
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p += l;
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len -= l;
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m->offset += l;
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if (m->offset == 64) {
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#if defined(WORDS_BIGENDIAN)
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int i;
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for (i = 0; i < 16; ++i)
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m->current[i] = swap_u_int32_t (m->current[i]);
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#endif
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calc (m, m->current);
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m->offset = 0;
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}
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}
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}
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void
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md4_finito (struct md4 *m, void *res)
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{
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static u_char zeros[72];
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u_int32_t len;
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unsigned dstart = (120 - m->offset - 1) % 64 + 1;
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*zeros = 0x80;
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memset (zeros + 1, 0, sizeof(zeros) - 1);
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len = 8 * m->sz;
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len = swap_u_int32_t (len);
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memcpy (zeros + dstart, &len, sizeof(len));
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md4_update (m, zeros, dstart + 8);
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{
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int i;
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u_char *r = (u_char *)res;
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for (i = 0; i < 4; ++i) {
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r[4*i] = m->counter[i] & 0xFF;
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r[4*i+1] = (m->counter[i] >> 8) & 0xFF;
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r[4*i+2] = (m->counter[i] >> 16) & 0xFF;
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r[4*i+3] = (m->counter[i] >> 24) & 0xFF;
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}
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}
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#if 0
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{
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int i;
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u_int32_t *r = (u_int32_t *)res;
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for (i = 0; i < 4; ++i)
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r[i] = swap_u_int32_t (m->counter[i]);
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}
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#endif
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}
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