Sync libmd with FreeBSD:
[dragonfly.git] / sys / kern / md5c.c
CommitLineData
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1/*
2 * MD5C.C - RSA Data Security, Inc., MD5 message-digest algorithm
3 *
4 * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
5 * rights reserved.
6 *
7 * License to copy and use this software is granted provided that it
8 * is identified as the "RSA Data Security, Inc. MD5 Message-Digest
9 * Algorithm" in all material mentioning or referencing this software
10 * or this function.
11 *
12 * License is also granted to make and use derivative works provided
13 * that such works are identified as "derived from the RSA Data
14 * Security, Inc. MD5 Message-Digest Algorithm" in all material
15 * mentioning or referencing the derived work.
16 *
17 * RSA Data Security, Inc. makes no representations concerning either
18 * the merchantability of this software or the suitability of this
19 * software for any particular purpose. It is provided "as is"
20 * without express or implied warranty of any kind.
21 *
22 * These notices must be retained in any copies of any part of this
23 * documentation and/or software.
24 *
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25 * $FreeBSD: src/sys/kern/md5c.c,v 1.27 2006/03/30 18:45:50 pjd Exp $
26 * $DragonFly: src/sys/kern/md5c.c,v 1.5 2008/09/11 20:25:34 swildner Exp $
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27 *
28 * This code is the same as the code published by RSA Inc. It has been
29 * edited for clarity and style only.
30 */
31
32#include <sys/types.h>
33
34#ifdef _KERNEL
35#include <sys/systm.h>
36#else
37#include <string.h>
38#endif
39
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40#include <machine/endian.h>
41#include <sys/endian.h>
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42#include <sys/md5.h>
43
3cd01911 44#if (BYTE_ORDER == LITTLE_ENDIAN)
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45#define Encode memcpy
46#define Decode memcpy
3cd01911 47#else
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48
49/*
50 * Encodes input (u_int32_t) into output (unsigned char). Assumes len is
51 * a multiple of 4.
52 */
53
984263bc 54static void
fbda7fa6 55Encode (unsigned char *output, u_int32_t *input, unsigned int len)
984263bc 56{
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57 unsigned int i;
58 uint32_t ip;
59
60 for (i = 0; i < len / 4; i++) {
61 ip = input[i];
62 *output++ = ip;
63 *output++ = ip >> 8;
64 *output++ = ip >> 16;
65 *output++ = ip >> 24;
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66 }
67}
68
69/*
70 * Decodes input (unsigned char) into output (u_int32_t). Assumes len is
71 * a multiple of 4.
72 */
73
74static void
fbda7fa6 75Decode (u_int32_t *output, const unsigned char *input, unsigned int len)
984263bc 76{
3cd01911 77 unsigned int i;
984263bc 78
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79 for (i = 0; i < len; i += 4) {
80 *output++ = input[i] | (input[i+1] << 8) | (input[i+2] << 16) |
81 (input[i+3] << 24);
82 }
984263bc 83}
3cd01911 84#endif
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85
86static unsigned char PADDING[64] = {
87 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
88 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
89 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
90};
91
92/* F, G, H and I are basic MD5 functions. */
93#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
94#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
95#define H(x, y, z) ((x) ^ (y) ^ (z))
96#define I(x, y, z) ((y) ^ ((x) | (~z)))
97
98/* ROTATE_LEFT rotates x left n bits. */
99#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
100
101/*
102 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
103 * Rotation is separate from addition to prevent recomputation.
104 */
105#define FF(a, b, c, d, x, s, ac) { \
106 (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
107 (a) = ROTATE_LEFT ((a), (s)); \
108 (a) += (b); \
109 }
110#define GG(a, b, c, d, x, s, ac) { \
111 (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
112 (a) = ROTATE_LEFT ((a), (s)); \
113 (a) += (b); \
114 }
115#define HH(a, b, c, d, x, s, ac) { \
116 (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
117 (a) = ROTATE_LEFT ((a), (s)); \
118 (a) += (b); \
119 }
120#define II(a, b, c, d, x, s, ac) { \
121 (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
122 (a) = ROTATE_LEFT ((a), (s)); \
123 (a) += (b); \
124 }
125
126/* MD5 initialization. Begins an MD5 operation, writing a new context. */
127
128void
fbda7fa6 129MD5Init (MD5_CTX *context)
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130{
131
132 context->count[0] = context->count[1] = 0;
133
134 /* Load magic initialization constants. */
135 context->state[0] = 0x67452301;
136 context->state[1] = 0xefcdab89;
137 context->state[2] = 0x98badcfe;
138 context->state[3] = 0x10325476;
139}
140
141/*
142 * MD5 block update operation. Continues an MD5 message-digest
143 * operation, processing another message block, and updating the
144 * context.
145 */
146
147void
3cd01911 148MD5Update (MD5_CTX *context, const void *in, unsigned int inputLen)
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149{
150 unsigned int i, index, partLen;
3cd01911 151 const unsigned char *input = in;
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152
153 /* Compute number of bytes mod 64 */
154 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
155
156 /* Update number of bits */
157 if ((context->count[0] += ((u_int32_t)inputLen << 3))
158 < ((u_int32_t)inputLen << 3))
159 context->count[1]++;
160 context->count[1] += ((u_int32_t)inputLen >> 29);
161
162 partLen = 64 - index;
163
164 /* Transform as many times as possible. */
165 if (inputLen >= partLen) {
166 memcpy((void *)&context->buffer[index], (const void *)input,
167 partLen);
168 MD5Transform (context->state, context->buffer);
169
170 for (i = partLen; i + 63 < inputLen; i += 64)
171 MD5Transform (context->state, &input[i]);
172
173 index = 0;
174 }
175 else
176 i = 0;
177
178 /* Buffer remaining input */
179 memcpy ((void *)&context->buffer[index], (const void *)&input[i],
180 inputLen-i);
181}
182
183/*
184 * MD5 padding. Adds padding followed by original length.
185 */
186
187void
fbda7fa6 188MD5Pad (MD5_CTX *context)
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189{
190 unsigned char bits[8];
191 unsigned int index, padLen;
192
193 /* Save number of bits */
194 Encode (bits, context->count, 8);
195
196 /* Pad out to 56 mod 64. */
197 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
198 padLen = (index < 56) ? (56 - index) : (120 - index);
199 MD5Update (context, PADDING, padLen);
200
201 /* Append length (before padding) */
202 MD5Update (context, bits, 8);
203}
204
205/*
206 * MD5 finalization. Ends an MD5 message-digest operation, writing the
207 * the message digest and zeroizing the context.
208 */
209
210void
fbda7fa6 211MD5Final (unsigned char digest[16], MD5_CTX *context)
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212{
213 /* Do padding. */
214 MD5Pad (context);
215
216 /* Store state in digest */
217 Encode (digest, context->state, 16);
218
219 /* Zeroize sensitive information. */
220 memset ((void *)context, 0, sizeof (*context));
221}
222
223/* MD5 basic transformation. Transforms state based on block. */
224
225void
fbda7fa6 226MD5Transform (u_int32_t state[4], const unsigned char block[64])
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227{
228 u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
229
230 Decode (x, block, 64);
231
232 /* Round 1 */
233#define S11 7
234#define S12 12
235#define S13 17
236#define S14 22
237 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
238 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
239 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
240 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
241 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
242 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
243 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
244 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
245 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
246 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
247 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
248 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
249 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
250 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
251 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
252 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
253
254 /* Round 2 */
255#define S21 5
256#define S22 9
257#define S23 14
258#define S24 20
259 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
260 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
261 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
262 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
263 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
264 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
265 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
266 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
267 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
268 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
269 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
270 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
271 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
272 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
273 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
274 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
275
276 /* Round 3 */
277#define S31 4
278#define S32 11
279#define S33 16
280#define S34 23
281 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
282 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
283 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
284 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
285 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
286 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
287 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
288 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
289 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
290 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
291 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
292 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
293 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
294 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
295 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
296 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
297
298 /* Round 4 */
299#define S41 6
300#define S42 10
301#define S43 15
302#define S44 21
303 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
304 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
305 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
306 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
307 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
308 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
309 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
310 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
311 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
312 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
313 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
314 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
315 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
316 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
317 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
318 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
319
320 state[0] += a;
321 state[1] += b;
322 state[2] += c;
323 state[3] += d;
324
325 /* Zeroize sensitive information. */
326 memset ((void *)x, 0, sizeof (x));
327}