275 lines
6.9 KiB
C
275 lines
6.9 KiB
C
/*
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* Copyright (c) 1995 - 2001 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. 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("$Heimdal: md5.c,v 1.15 2001/01/29 04:33:44 assar Exp $"
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"$NetBSD: md5.c,v 1.1.1.4 2002/09/12 12:41:42 joda Exp $");
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#endif
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#include "md5.h"
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#include "hash.h"
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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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MD5_Init (struct md5 *m)
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{
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m->sz[0] = 0;
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m->sz[1] = 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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#define F(x,y,z) CRAYFIX((x & y) | (~x & z))
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#define G(x,y,z) CRAYFIX((x & z) | (y & ~z))
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#define H(x,y,z) (x ^ y ^ z)
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#define I(x,y,z) CRAYFIX(y ^ (x | ~z))
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#define DOIT(a,b,c,d,k,s,i,OP) \
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a = b + 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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#define DO4(a,b,c,d,k,s,i) DOIT(a,b,c,d,k,s,i,I)
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static inline void
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calc (struct md5 *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,0,7,0xd76aa478);
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DO1(D,A,B,C,1,12,0xe8c7b756);
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DO1(C,D,A,B,2,17,0x242070db);
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DO1(B,C,D,A,3,22,0xc1bdceee);
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DO1(A,B,C,D,4,7,0xf57c0faf);
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DO1(D,A,B,C,5,12,0x4787c62a);
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DO1(C,D,A,B,6,17,0xa8304613);
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DO1(B,C,D,A,7,22,0xfd469501);
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DO1(A,B,C,D,8,7,0x698098d8);
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DO1(D,A,B,C,9,12,0x8b44f7af);
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DO1(C,D,A,B,10,17,0xffff5bb1);
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DO1(B,C,D,A,11,22,0x895cd7be);
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DO1(A,B,C,D,12,7,0x6b901122);
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DO1(D,A,B,C,13,12,0xfd987193);
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DO1(C,D,A,B,14,17,0xa679438e);
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DO1(B,C,D,A,15,22,0x49b40821);
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/* Round 2 */
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DO2(A,B,C,D,1,5,0xf61e2562);
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DO2(D,A,B,C,6,9,0xc040b340);
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DO2(C,D,A,B,11,14,0x265e5a51);
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DO2(B,C,D,A,0,20,0xe9b6c7aa);
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DO2(A,B,C,D,5,5,0xd62f105d);
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DO2(D,A,B,C,10,9,0x2441453);
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DO2(C,D,A,B,15,14,0xd8a1e681);
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DO2(B,C,D,A,4,20,0xe7d3fbc8);
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DO2(A,B,C,D,9,5,0x21e1cde6);
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DO2(D,A,B,C,14,9,0xc33707d6);
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DO2(C,D,A,B,3,14,0xf4d50d87);
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DO2(B,C,D,A,8,20,0x455a14ed);
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DO2(A,B,C,D,13,5,0xa9e3e905);
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DO2(D,A,B,C,2,9,0xfcefa3f8);
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DO2(C,D,A,B,7,14,0x676f02d9);
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DO2(B,C,D,A,12,20,0x8d2a4c8a);
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/* Round 3 */
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DO3(A,B,C,D,5,4,0xfffa3942);
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DO3(D,A,B,C,8,11,0x8771f681);
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DO3(C,D,A,B,11,16,0x6d9d6122);
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DO3(B,C,D,A,14,23,0xfde5380c);
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DO3(A,B,C,D,1,4,0xa4beea44);
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DO3(D,A,B,C,4,11,0x4bdecfa9);
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DO3(C,D,A,B,7,16,0xf6bb4b60);
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DO3(B,C,D,A,10,23,0xbebfbc70);
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DO3(A,B,C,D,13,4,0x289b7ec6);
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DO3(D,A,B,C,0,11,0xeaa127fa);
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DO3(C,D,A,B,3,16,0xd4ef3085);
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DO3(B,C,D,A,6,23,0x4881d05);
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DO3(A,B,C,D,9,4,0xd9d4d039);
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DO3(D,A,B,C,12,11,0xe6db99e5);
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DO3(C,D,A,B,15,16,0x1fa27cf8);
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DO3(B,C,D,A,2,23,0xc4ac5665);
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/* Round 4 */
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DO4(A,B,C,D,0,6,0xf4292244);
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DO4(D,A,B,C,7,10,0x432aff97);
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DO4(C,D,A,B,14,15,0xab9423a7);
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DO4(B,C,D,A,5,21,0xfc93a039);
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DO4(A,B,C,D,12,6,0x655b59c3);
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DO4(D,A,B,C,3,10,0x8f0ccc92);
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DO4(C,D,A,B,10,15,0xffeff47d);
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DO4(B,C,D,A,1,21,0x85845dd1);
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DO4(A,B,C,D,8,6,0x6fa87e4f);
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DO4(D,A,B,C,15,10,0xfe2ce6e0);
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DO4(C,D,A,B,6,15,0xa3014314);
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DO4(B,C,D,A,13,21,0x4e0811a1);
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DO4(A,B,C,D,4,6,0xf7537e82);
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DO4(D,A,B,C,11,10,0xbd3af235);
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DO4(C,D,A,B,2,15,0x2ad7d2bb);
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DO4(B,C,D,A,9,21,0xeb86d391);
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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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#if defined(WORDS_BIGENDIAN)
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static inline u_int32_t
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swap_u_int32_t (u_int32_t t)
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{
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u_int32_t temp1, temp2;
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temp1 = cshift(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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}
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#endif
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struct x32{
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unsigned int a:32;
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unsigned int b:32;
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};
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void
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MD5_Update (struct md5 *m, const void *v, size_t len)
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{
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const unsigned char *p = v;
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size_t old_sz = m->sz[0];
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size_t offset;
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m->sz[0] += len * 8;
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if (m->sz[0] < old_sz)
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++m->sz[1];
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offset = (old_sz / 8) % 64;
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while(len > 0){
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size_t l = min(len, 64 - offset);
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memcpy(m->save + offset, p, l);
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offset += l;
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p += l;
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len -= l;
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if(offset == 64){
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#if defined(WORDS_BIGENDIAN)
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int i;
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u_int32_t current[16];
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struct x32 *u = (struct x32*)m->save;
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for(i = 0; i < 8; i++){
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current[2*i+0] = swap_u_int32_t(u[i].a);
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current[2*i+1] = swap_u_int32_t(u[i].b);
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}
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calc(m, current);
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#else
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calc(m, (u_int32_t*)m->save);
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#endif
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offset = 0;
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}
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}
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}
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void
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MD5_Final (void *res, struct md5 *m)
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{
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unsigned char zeros[72];
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unsigned offset = (m->sz[0] / 8) % 64;
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unsigned int dstart = (120 - 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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zeros[dstart+0] = (m->sz[0] >> 0) & 0xff;
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zeros[dstart+1] = (m->sz[0] >> 8) & 0xff;
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zeros[dstart+2] = (m->sz[0] >> 16) & 0xff;
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zeros[dstart+3] = (m->sz[0] >> 24) & 0xff;
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zeros[dstart+4] = (m->sz[1] >> 0) & 0xff;
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zeros[dstart+5] = (m->sz[1] >> 8) & 0xff;
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zeros[dstart+6] = (m->sz[1] >> 16) & 0xff;
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zeros[dstart+7] = (m->sz[1] >> 24) & 0xff;
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MD5_Update (m, zeros, dstart + 8);
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{
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int i;
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unsigned char *r = (unsigned 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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