source: trunk/src/lib/md5.c@ 1750

Last change on this file since 1750 was 1000, checked in by bird, 18 years ago

Added md5 and crc32. (pd and netbsd respectivly)
  • Property svn:eol-style set to native
File size: 7.9 KB
Line 
1/*
2 * This code implements the MD5 message-digest algorithm.
3 * The algorithm is due to Ron Rivest. This code was
4 * written by Colin Plumb in 1993, no copyright is claimed.
5 * This code is in the public domain; do with it what you wish.
6 *
7 * Equivalent code is available from RSA Data Security, Inc.
8 * This code has been tested against that, and is equivalent,
9 * except that you don't need to include two pages of legalese
10 * with every copy.
11 *
12 * To compute the message digest of a chunk of bytes, declare an
13 * MD5Context structure, pass it to MD5Init, call MD5Update as
14 * needed on buffers full of bytes, and then call MD5Final, which
15 * will fill a supplied 16-byte array with the digest.
16 */
17
18#include <string.h>
19#include "md5.h"
20#define uint32 uint32_t
21
22#if 0 /* don't need 100% correct md5, just fast md5. */
23#ifdef sgi
24#define HIGHFIRST
25#endif
26
27#ifdef sun
28#define HIGHFIRST
29#endif
30#endif /* skip this */
31
32#ifndef HIGHFIRST
33#define byteReverse(buf, len) /* Nothing */
34#else
35/*
36 * Note: this code is harmless on little-endian machines.
37 */
38void byteReverse(unsigned char *buf, unsigned longs)
39{
40 uint32 t;
41 do {
42 t = (uint32) ((unsigned) buf[3] << 8 | buf[2]) << 16 |
43 ((unsigned) buf[1] << 8 | buf[0]);
44 *(uint32 *) buf = t;
45 buf += 4;
46 } while (--longs);
47}
48#endif
49
50/*
51 * Start MD5 accumulation. Set bit count to 0 and buffer to mysterious
52 * initialization constants.
53 */
54void MD5Init(struct MD5Context *ctx)
55{
56 ctx->buf[0] = 0x67452301;
57 ctx->buf[1] = 0xefcdab89;
58 ctx->buf[2] = 0x98badcfe;
59 ctx->buf[3] = 0x10325476;
60
61 ctx->bits[0] = 0;
62 ctx->bits[1] = 0;
63}
64
65/*
66 * Update context to reflect the concatenation of another buffer full
67 * of bytes.
68 */
69void MD5Update(struct MD5Context *ctx, const unsigned char *buf, unsigned len)
70{
71 uint32 t;
72
73 /* Update bitcount */
74
75 t = ctx->bits[0];
76 if ((ctx->bits[0] = t + ((uint32) len << 3)) < t)
77 ctx->bits[1]++; /* Carry from low to high */
78 ctx->bits[1] += len >> 29;
79
80 t = (t >> 3) & 0x3f; /* Bytes already in shsInfo->data */
81
82 /* Handle any leading odd-sized chunks */
83
84 if (t) {
85 unsigned char *p = (unsigned char *) ctx->in + t;
86
87 t = 64 - t;
88 if (len < t) {
89 memcpy(p, buf, len);
90 return;
91 }
92 memcpy(p, buf, t);
93 byteReverse(ctx->in, 16);
94 MD5Transform(ctx->buf, (uint32 *) ctx->in);
95 buf += t;
96 len -= t;
97 }
98 /* Process data in 64-byte chunks */
99
100 while (len >= 64) {
101 memcpy(ctx->in, buf, 64);
102 byteReverse(ctx->in, 16);
103 MD5Transform(ctx->buf, (uint32 *) ctx->in);
104 buf += 64;
105 len -= 64;
106 }
107
108 /* Handle any remaining bytes of data. */
109
110 memcpy(ctx->in, buf, len);
111}
112
113/*
114 * Final wrapup - pad to 64-byte boundary with the bit pattern
115 * 1 0* (64-bit count of bits processed, MSB-first)
116 */
117void MD5Final(unsigned char digest[16], struct MD5Context *ctx)
118{
119 unsigned count;
120 unsigned char *p;
121
122 /* Compute number of bytes mod 64 */
123 count = (ctx->bits[0] >> 3) & 0x3F;
124
125 /* Set the first char of padding to 0x80. This is safe since there is
126 always at least one byte free */
127 p = ctx->in + count;
128 *p++ = 0x80;
129
130 /* Bytes of padding needed to make 64 bytes */
131 count = 64 - 1 - count;
132
133 /* Pad out to 56 mod 64 */
134 if (count < 8) {
135 /* Two lots of padding: Pad the first block to 64 bytes */
136 memset(p, 0, count);
137 byteReverse(ctx->in, 16);
138 MD5Transform(ctx->buf, (uint32 *) ctx->in);
139
140 /* Now fill the next block with 56 bytes */
141 memset(ctx->in, 0, 56);
142 } else {
143 /* Pad block to 56 bytes */
144 memset(p, 0, count - 8);
145 }
146 byteReverse(ctx->in, 14);
147
148 /* Append length in bits and transform */
149 ((uint32 *) ctx->in)[14] = ctx->bits[0];
150 ((uint32 *) ctx->in)[15] = ctx->bits[1];
151
152 MD5Transform(ctx->buf, (uint32 *) ctx->in);
153 byteReverse((unsigned char *) ctx->buf, 4);
154 memcpy(digest, ctx->buf, 16);
155 memset(ctx, 0, sizeof(ctx)); /* In case it's sensitive */
156}
157
158
159/* The four core functions - F1 is optimized somewhat */
160
161/* #define F1(x, y, z) (x & y | ~x & z) */
162#define F1(x, y, z) (z ^ (x & (y ^ z)))
163#define F2(x, y, z) F1(z, x, y)
164#define F3(x, y, z) (x ^ y ^ z)
165#define F4(x, y, z) (y ^ (x | ~z))
166
167/* This is the central step in the MD5 algorithm. */
168#define MD5STEP(f, w, x, y, z, data, s) \
169 ( w += f(x, y, z) + data, w = w<<s | w>>(32-s), w += x )
170
171/*
172 * The core of the MD5 algorithm, this alters an existing MD5 hash to
173 * reflect the addition of 16 longwords of new data. MD5Update blocks
174 * the data and converts bytes into longwords for this routine.
175 */
176void MD5Transform(uint32 buf[4], uint32 in[16])
177{
178 register uint32 a, b, c, d;
179
180 a = buf[0];
181 b = buf[1];
182 c = buf[2];
183 d = buf[3];
184
185 MD5STEP(F1, a, b, c, d, in[0] + 0xd76aa478, 7);
186 MD5STEP(F1, d, a, b, c, in[1] + 0xe8c7b756, 12);
187 MD5STEP(F1, c, d, a, b, in[2] + 0x242070db, 17);
188 MD5STEP(F1, b, c, d, a, in[3] + 0xc1bdceee, 22);
189 MD5STEP(F1, a, b, c, d, in[4] + 0xf57c0faf, 7);
190 MD5STEP(F1, d, a, b, c, in[5] + 0x4787c62a, 12);
191 MD5STEP(F1, c, d, a, b, in[6] + 0xa8304613, 17);
192 MD5STEP(F1, b, c, d, a, in[7] + 0xfd469501, 22);
193 MD5STEP(F1, a, b, c, d, in[8] + 0x698098d8, 7);
194 MD5STEP(F1, d, a, b, c, in[9] + 0x8b44f7af, 12);
195 MD5STEP(F1, c, d, a, b, in[10] + 0xffff5bb1, 17);
196 MD5STEP(F1, b, c, d, a, in[11] + 0x895cd7be, 22);
197 MD5STEP(F1, a, b, c, d, in[12] + 0x6b901122, 7);
198 MD5STEP(F1, d, a, b, c, in[13] + 0xfd987193, 12);
199 MD5STEP(F1, c, d, a, b, in[14] + 0xa679438e, 17);
200 MD5STEP(F1, b, c, d, a, in[15] + 0x49b40821, 22);
201
202 MD5STEP(F2, a, b, c, d, in[1] + 0xf61e2562, 5);
203 MD5STEP(F2, d, a, b, c, in[6] + 0xc040b340, 9);
204 MD5STEP(F2, c, d, a, b, in[11] + 0x265e5a51, 14);
205 MD5STEP(F2, b, c, d, a, in[0] + 0xe9b6c7aa, 20);
206 MD5STEP(F2, a, b, c, d, in[5] + 0xd62f105d, 5);
207 MD5STEP(F2, d, a, b, c, in[10] + 0x02441453, 9);
208 MD5STEP(F2, c, d, a, b, in[15] + 0xd8a1e681, 14);
209 MD5STEP(F2, b, c, d, a, in[4] + 0xe7d3fbc8, 20);
210 MD5STEP(F2, a, b, c, d, in[9] + 0x21e1cde6, 5);
211 MD5STEP(F2, d, a, b, c, in[14] + 0xc33707d6, 9);
212 MD5STEP(F2, c, d, a, b, in[3] + 0xf4d50d87, 14);
213 MD5STEP(F2, b, c, d, a, in[8] + 0x455a14ed, 20);
214 MD5STEP(F2, a, b, c, d, in[13] + 0xa9e3e905, 5);
215 MD5STEP(F2, d, a, b, c, in[2] + 0xfcefa3f8, 9);
216 MD5STEP(F2, c, d, a, b, in[7] + 0x676f02d9, 14);
217 MD5STEP(F2, b, c, d, a, in[12] + 0x8d2a4c8a, 20);
218
219 MD5STEP(F3, a, b, c, d, in[5] + 0xfffa3942, 4);
220 MD5STEP(F3, d, a, b, c, in[8] + 0x8771f681, 11);
221 MD5STEP(F3, c, d, a, b, in[11] + 0x6d9d6122, 16);
222 MD5STEP(F3, b, c, d, a, in[14] + 0xfde5380c, 23);
223 MD5STEP(F3, a, b, c, d, in[1] + 0xa4beea44, 4);
224 MD5STEP(F3, d, a, b, c, in[4] + 0x4bdecfa9, 11);
225 MD5STEP(F3, c, d, a, b, in[7] + 0xf6bb4b60, 16);
226 MD5STEP(F3, b, c, d, a, in[10] + 0xbebfbc70, 23);
227 MD5STEP(F3, a, b, c, d, in[13] + 0x289b7ec6, 4);
228 MD5STEP(F3, d, a, b, c, in[0] + 0xeaa127fa, 11);
229 MD5STEP(F3, c, d, a, b, in[3] + 0xd4ef3085, 16);
230 MD5STEP(F3, b, c, d, a, in[6] + 0x04881d05, 23);
231 MD5STEP(F3, a, b, c, d, in[9] + 0xd9d4d039, 4);
232 MD5STEP(F3, d, a, b, c, in[12] + 0xe6db99e5, 11);
233 MD5STEP(F3, c, d, a, b, in[15] + 0x1fa27cf8, 16);
234 MD5STEP(F3, b, c, d, a, in[2] + 0xc4ac5665, 23);
235
236 MD5STEP(F4, a, b, c, d, in[0] + 0xf4292244, 6);
237 MD5STEP(F4, d, a, b, c, in[7] + 0x432aff97, 10);
238 MD5STEP(F4, c, d, a, b, in[14] + 0xab9423a7, 15);
239 MD5STEP(F4, b, c, d, a, in[5] + 0xfc93a039, 21);
240 MD5STEP(F4, a, b, c, d, in[12] + 0x655b59c3, 6);
241 MD5STEP(F4, d, a, b, c, in[3] + 0x8f0ccc92, 10);
242 MD5STEP(F4, c, d, a, b, in[10] + 0xffeff47d, 15);
243 MD5STEP(F4, b, c, d, a, in[1] + 0x85845dd1, 21);
244 MD5STEP(F4, a, b, c, d, in[8] + 0x6fa87e4f, 6);
245 MD5STEP(F4, d, a, b, c, in[15] + 0xfe2ce6e0, 10);
246 MD5STEP(F4, c, d, a, b, in[6] + 0xa3014314, 15);
247 MD5STEP(F4, b, c, d, a, in[13] + 0x4e0811a1, 21);
248 MD5STEP(F4, a, b, c, d, in[4] + 0xf7537e82, 6);
249 MD5STEP(F4, d, a, b, c, in[11] + 0xbd3af235, 10);
250 MD5STEP(F4, c, d, a, b, in[2] + 0x2ad7d2bb, 15);
251 MD5STEP(F4, b, c, d, a, in[9] + 0xeb86d391, 21);
252
253 buf[0] += a;
254 buf[1] += b;
255 buf[2] += c;
256 buf[3] += d;
257}
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