1/*
2 * Copyright (c) 1995 - 2001 Kungliga Tekniska Högskolan
3 * (Royal Institute of Technology, Stockholm, Sweden).
4 * All rights reserved.
5 *
6 * Redistribution and use in source and binary forms, with or without
7 * modification, are permitted provided that the following conditions
8 * are met:
9 *
10 * 1. Redistributions of source code must retain the above copyright
11 *    notice, this list of conditions and the following disclaimer.
12 *
13 * 2. Redistributions in binary form must reproduce the above copyright
14 *    notice, this list of conditions and the following disclaimer in the
15 *    documentation and/or other materials provided with the distribution.
16 *
17 * 3. Neither the name of the Institute nor the names of its contributors
18 *    may be used to endorse or promote products derived from this software
19 *    without specific prior written permission.
20 *
21 * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
22 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
23 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
24 * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
25 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
26 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
27 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
28 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
29 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
30 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
31 * SUCH DAMAGE.
32 */
33
34#include "config.h"
35
36#include "hash.h"
37#include "md5.h"
38
39#define A m->counter[0]
40#define B m->counter[1]
41#define C m->counter[2]
42#define D m->counter[3]
43#define X data
44
45void
46MD5_Init (struct md5 *m)
47{
48  m->sz[0] = 0;
49  m->sz[1] = 0;
50  D = 0x10325476;
51  C = 0x98badcfe;
52  B = 0xefcdab89;
53  A = 0x67452301;
54}
55
56#define F(x,y,z) CRAYFIX((x & y) | (~x & z))
57#define G(x,y,z) CRAYFIX((x & z) | (y & ~z))
58#define H(x,y,z) (x ^ y ^ z)
59#define I(x,y,z) CRAYFIX(y ^ (x | ~z))
60
61#define DOIT(a,b,c,d,k,s,i,OP) \
62a = b + cshift(a + OP(b,c,d) + X[k] + (i), s)
63
64#define DO1(a,b,c,d,k,s,i) DOIT(a,b,c,d,k,s,i,F)
65#define DO2(a,b,c,d,k,s,i) DOIT(a,b,c,d,k,s,i,G)
66#define DO3(a,b,c,d,k,s,i) DOIT(a,b,c,d,k,s,i,H)
67#define DO4(a,b,c,d,k,s,i) DOIT(a,b,c,d,k,s,i,I)
68
69static inline void
70calc (struct md5 *m, uint32_t *data)
71{
72  uint32_t AA, BB, CC, DD;
73
74  AA = A;
75  BB = B;
76  CC = C;
77  DD = D;
78
79  /* Round 1 */
80
81  DO1(A,B,C,D,0,7,0xd76aa478);
82  DO1(D,A,B,C,1,12,0xe8c7b756);
83  DO1(C,D,A,B,2,17,0x242070db);
84  DO1(B,C,D,A,3,22,0xc1bdceee);
85
86  DO1(A,B,C,D,4,7,0xf57c0faf);
87  DO1(D,A,B,C,5,12,0x4787c62a);
88  DO1(C,D,A,B,6,17,0xa8304613);
89  DO1(B,C,D,A,7,22,0xfd469501);
90
91  DO1(A,B,C,D,8,7,0x698098d8);
92  DO1(D,A,B,C,9,12,0x8b44f7af);
93  DO1(C,D,A,B,10,17,0xffff5bb1);
94  DO1(B,C,D,A,11,22,0x895cd7be);
95
96  DO1(A,B,C,D,12,7,0x6b901122);
97  DO1(D,A,B,C,13,12,0xfd987193);
98  DO1(C,D,A,B,14,17,0xa679438e);
99  DO1(B,C,D,A,15,22,0x49b40821);
100
101  /* Round 2 */
102
103  DO2(A,B,C,D,1,5,0xf61e2562);
104  DO2(D,A,B,C,6,9,0xc040b340);
105  DO2(C,D,A,B,11,14,0x265e5a51);
106  DO2(B,C,D,A,0,20,0xe9b6c7aa);
107
108  DO2(A,B,C,D,5,5,0xd62f105d);
109  DO2(D,A,B,C,10,9,0x2441453);
110  DO2(C,D,A,B,15,14,0xd8a1e681);
111  DO2(B,C,D,A,4,20,0xe7d3fbc8);
112
113  DO2(A,B,C,D,9,5,0x21e1cde6);
114  DO2(D,A,B,C,14,9,0xc33707d6);
115  DO2(C,D,A,B,3,14,0xf4d50d87);
116  DO2(B,C,D,A,8,20,0x455a14ed);
117
118  DO2(A,B,C,D,13,5,0xa9e3e905);
119  DO2(D,A,B,C,2,9,0xfcefa3f8);
120  DO2(C,D,A,B,7,14,0x676f02d9);
121  DO2(B,C,D,A,12,20,0x8d2a4c8a);
122
123  /* Round 3 */
124
125  DO3(A,B,C,D,5,4,0xfffa3942);
126  DO3(D,A,B,C,8,11,0x8771f681);
127  DO3(C,D,A,B,11,16,0x6d9d6122);
128  DO3(B,C,D,A,14,23,0xfde5380c);
129
130  DO3(A,B,C,D,1,4,0xa4beea44);
131  DO3(D,A,B,C,4,11,0x4bdecfa9);
132  DO3(C,D,A,B,7,16,0xf6bb4b60);
133  DO3(B,C,D,A,10,23,0xbebfbc70);
134
135  DO3(A,B,C,D,13,4,0x289b7ec6);
136  DO3(D,A,B,C,0,11,0xeaa127fa);
137  DO3(C,D,A,B,3,16,0xd4ef3085);
138  DO3(B,C,D,A,6,23,0x4881d05);
139
140  DO3(A,B,C,D,9,4,0xd9d4d039);
141  DO3(D,A,B,C,12,11,0xe6db99e5);
142  DO3(C,D,A,B,15,16,0x1fa27cf8);
143  DO3(B,C,D,A,2,23,0xc4ac5665);
144
145  /* Round 4 */
146
147  DO4(A,B,C,D,0,6,0xf4292244);
148  DO4(D,A,B,C,7,10,0x432aff97);
149  DO4(C,D,A,B,14,15,0xab9423a7);
150  DO4(B,C,D,A,5,21,0xfc93a039);
151
152  DO4(A,B,C,D,12,6,0x655b59c3);
153  DO4(D,A,B,C,3,10,0x8f0ccc92);
154  DO4(C,D,A,B,10,15,0xffeff47d);
155  DO4(B,C,D,A,1,21,0x85845dd1);
156
157  DO4(A,B,C,D,8,6,0x6fa87e4f);
158  DO4(D,A,B,C,15,10,0xfe2ce6e0);
159  DO4(C,D,A,B,6,15,0xa3014314);
160  DO4(B,C,D,A,13,21,0x4e0811a1);
161
162  DO4(A,B,C,D,4,6,0xf7537e82);
163  DO4(D,A,B,C,11,10,0xbd3af235);
164  DO4(C,D,A,B,2,15,0x2ad7d2bb);
165  DO4(B,C,D,A,9,21,0xeb86d391);
166
167  A += AA;
168  B += BB;
169  C += CC;
170  D += DD;
171}
172
173/*
174 * From `Performance analysis of MD5' by Joseph D. Touch <touch@isi.edu>
175 */
176
177#if defined(WORDS_BIGENDIAN)
178static inline uint32_t
179swap_uint32_t (uint32_t t)
180{
181  uint32_t temp1, temp2;
182
183  temp1   = cshift(t, 16);
184  temp2   = temp1 >> 8;
185  temp1  &= 0x00ff00ff;
186  temp2  &= 0x00ff00ff;
187  temp1 <<= 8;
188  return temp1 | temp2;
189}
190#endif
191
192struct x32{
193  unsigned int a:32;
194  unsigned int b:32;
195};
196
197void
198MD5_Update (struct md5 *m, const void *v, size_t len)
199{
200  const unsigned char *p = v;
201  size_t old_sz = m->sz[0];
202  size_t offset;
203
204  m->sz[0] += len * 8;
205  if (m->sz[0] < old_sz)
206      ++m->sz[1];
207  offset = (old_sz / 8)  % 64;
208  while(len > 0){
209    size_t l = min(len, 64 - offset);
210    memcpy(m->save + offset, p, l);
211    offset += l;
212    p += l;
213    len -= l;
214    if(offset == 64){
215#if defined(WORDS_BIGENDIAN)
216      int i;
217      uint32_t swapped[16];
218      struct x32 *us = (struct x32*)m->save;
219      for(i = 0; i < 8; i++){
220	swapped[2*i+0] = swap_uint32_t(us[i].a);
221	swapped[2*i+1] = swap_uint32_t(us[i].b);
222      }
223      calc(m, swapped);
224#else
225      calc(m, (uint32_t*)m->save);
226#endif
227      offset = 0;
228    }
229  }
230}
231
232void
233MD5_Final (void *res, struct md5 *m)
234{
235  unsigned char zeros[72];
236  unsigned offset = (m->sz[0] / 8) % 64;
237  unsigned int dstart = (120 - offset - 1) % 64 + 1;
238
239  *zeros = 0x80;
240  memset (zeros + 1, 0, sizeof(zeros) - 1);
241  zeros[dstart+0] = (m->sz[0] >> 0) & 0xff;
242  zeros[dstart+1] = (m->sz[0] >> 8) & 0xff;
243  zeros[dstart+2] = (m->sz[0] >> 16) & 0xff;
244  zeros[dstart+3] = (m->sz[0] >> 24) & 0xff;
245  zeros[dstart+4] = (m->sz[1] >> 0) & 0xff;
246  zeros[dstart+5] = (m->sz[1] >> 8) & 0xff;
247  zeros[dstart+6] = (m->sz[1] >> 16) & 0xff;
248  zeros[dstart+7] = (m->sz[1] >> 24) & 0xff;
249  MD5_Update (m, zeros, dstart + 8);
250  {
251      int i;
252      unsigned char *r = (unsigned char *)res;
253
254      for (i = 0; i < 4; ++i) {
255	  r[4*i]   = m->counter[i] & 0xFF;
256	  r[4*i+1] = (m->counter[i] >> 8) & 0xFF;
257	  r[4*i+2] = (m->counter[i] >> 16) & 0xFF;
258	  r[4*i+3] = (m->counter[i] >> 24) & 0xFF;
259      }
260  }
261#if 0
262  {
263    int i;
264    uint32_t *r = (uint32_t *)res;
265
266    for (i = 0; i < 4; ++i)
267      r[i] = swap_uint32_t (m->counter[i]);
268  }
269#endif
270}
271