nrelease - fix/improve livecd
[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 *
3cd01911 25 * $FreeBSD: src/sys/kern/md5c.c,v 1.27 2006/03/30 18:45:50 pjd Exp $
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26 *
27 * This code is the same as the code published by RSA Inc. It has been
28 * edited for clarity and style only.
29 */
30
381f866e 31/*
32 * This file should be kept in sync with src/lib/libmd/md5c.c
33 */
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34#include <sys/types.h>
35
36#ifdef _KERNEL
37#include <sys/systm.h>
38#else
39#include <string.h>
40#endif
41
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42#include <machine/endian.h>
43#include <sys/endian.h>
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44#include <sys/md5.h>
45
b5d7e50f 46static void __kern__MD5Transform(u_int32_t [4], const unsigned char [64]);
381f866e 47
3cd01911 48#if (BYTE_ORDER == LITTLE_ENDIAN)
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49#define Encode memcpy
50#define Decode memcpy
3cd01911 51#else
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52
53/*
54 * Encodes input (u_int32_t) into output (unsigned char). Assumes len is
55 * a multiple of 4.
56 */
57
984263bc 58static void
fbda7fa6 59Encode (unsigned char *output, u_int32_t *input, unsigned int len)
984263bc 60{
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61 unsigned int i;
62 uint32_t ip;
63
64 for (i = 0; i < len / 4; i++) {
65 ip = input[i];
66 *output++ = ip;
67 *output++ = ip >> 8;
68 *output++ = ip >> 16;
69 *output++ = ip >> 24;
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70 }
71}
72
73/*
74 * Decodes input (unsigned char) into output (u_int32_t). Assumes len is
75 * a multiple of 4.
76 */
77
78static void
fbda7fa6 79Decode (u_int32_t *output, const unsigned char *input, unsigned int len)
984263bc 80{
3cd01911 81 unsigned int i;
984263bc 82
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83 for (i = 0; i < len; i += 4) {
84 *output++ = input[i] | (input[i+1] << 8) | (input[i+2] << 16) |
85 (input[i+3] << 24);
86 }
984263bc 87}
3cd01911 88#endif
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89
90static unsigned char PADDING[64] = {
91 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
92 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
93 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
94};
95
96/* F, G, H and I are basic MD5 functions. */
97#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
98#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
99#define H(x, y, z) ((x) ^ (y) ^ (z))
100#define I(x, y, z) ((y) ^ ((x) | (~z)))
101
102/* ROTATE_LEFT rotates x left n bits. */
103#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
104
105/*
106 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
107 * Rotation is separate from addition to prevent recomputation.
108 */
109#define FF(a, b, c, d, x, s, ac) { \
110 (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
111 (a) = ROTATE_LEFT ((a), (s)); \
112 (a) += (b); \
113 }
114#define GG(a, b, c, d, x, s, ac) { \
115 (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
116 (a) = ROTATE_LEFT ((a), (s)); \
117 (a) += (b); \
118 }
119#define HH(a, b, c, d, x, s, ac) { \
120 (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
121 (a) = ROTATE_LEFT ((a), (s)); \
122 (a) += (b); \
123 }
124#define II(a, b, c, d, x, s, ac) { \
125 (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
126 (a) = ROTATE_LEFT ((a), (s)); \
127 (a) += (b); \
128 }
129
130/* MD5 initialization. Begins an MD5 operation, writing a new context. */
131
0fe46dc6 132int
fbda7fa6 133MD5Init (MD5_CTX *context)
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134{
135
0fe46dc6 136 context->Nl = context->Nh = 0;
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137
138 /* Load magic initialization constants. */
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139 context->A = 0x67452301;
140 context->B = 0xefcdab89;
141 context->C = 0x98badcfe;
142 context->D = 0x10325476;
143
144 return 1;
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145}
146
147/*
148 * MD5 block update operation. Continues an MD5 message-digest
149 * operation, processing another message block, and updating the
150 * context.
151 */
152
153void
3cd01911 154MD5Update (MD5_CTX *context, const void *in, unsigned int inputLen)
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155{
156 unsigned int i, index, partLen;
3cd01911 157 const unsigned char *input = in;
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158
159 /* Compute number of bytes mod 64 */
0fe46dc6 160 index = (unsigned int)((context->Nl >> 3) & 0x3F);
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161
162 /* Update number of bits */
0fe46dc6 163 if ((context->Nl += ((u_int32_t)inputLen << 3))
984263bc 164 < ((u_int32_t)inputLen << 3))
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165 context->Nh++;
166 context->Nh += ((u_int32_t)inputLen >> 29);
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167
168 partLen = 64 - index;
169
170 /* Transform as many times as possible. */
171 if (inputLen >= partLen) {
0fe46dc6 172 memcpy((void *)&((char *)context->data)[index], (const void *)input,
984263bc 173 partLen);
b5d7e50f 174 __kern__MD5Transform (&context->A, (char *)context->data);
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175
176 for (i = partLen; i + 63 < inputLen; i += 64)
b5d7e50f 177 __kern__MD5Transform (&context->A, &input[i]);
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178
179 index = 0;
180 }
181 else
182 i = 0;
183
184 /* Buffer remaining input */
0fe46dc6 185 memcpy ((void *)&((char *)context->data)[index], (const void *)&input[i],
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186 inputLen-i);
187}
188
189/*
190 * MD5 padding. Adds padding followed by original length.
191 */
192
381f866e 193static void
b5d7e50f 194__kern__MD5Pad (MD5_CTX *context)
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195{
196 unsigned char bits[8];
197 unsigned int index, padLen;
198
199 /* Save number of bits */
0fe46dc6 200 Encode (bits, &context->Nl, 8);
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201
202 /* Pad out to 56 mod 64. */
0fe46dc6 203 index = (unsigned int)((context->Nl >> 3) & 0x3f);
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204 padLen = (index < 56) ? (56 - index) : (120 - index);
205 MD5Update (context, PADDING, padLen);
206
207 /* Append length (before padding) */
208 MD5Update (context, bits, 8);
209}
210
211/*
212 * MD5 finalization. Ends an MD5 message-digest operation, writing the
213 * the message digest and zeroizing the context.
214 */
215
216void
fbda7fa6 217MD5Final (unsigned char digest[16], MD5_CTX *context)
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218{
219 /* Do padding. */
b5d7e50f 220 __kern__MD5Pad (context);
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221
222 /* Store state in digest */
0fe46dc6 223 Encode (digest, &context->A, 16);
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224
225 /* Zeroize sensitive information. */
226 memset ((void *)context, 0, sizeof (*context));
227}
228
229/* MD5 basic transformation. Transforms state based on block. */
230
381f866e 231static void
b5d7e50f 232__kern__MD5Transform (u_int32_t state[4], const unsigned char block[64])
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233{
234 u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
235
236 Decode (x, block, 64);
237
238 /* Round 1 */
239#define S11 7
240#define S12 12
241#define S13 17
242#define S14 22
243 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
244 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
245 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
246 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
247 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
248 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
249 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
250 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
251 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
252 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
253 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
254 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
255 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
256 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
257 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
258 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
259
260 /* Round 2 */
261#define S21 5
262#define S22 9
263#define S23 14
264#define S24 20
265 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
266 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
267 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
268 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
269 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
270 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
271 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
272 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
273 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
274 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
275 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
276 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
277 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
278 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
279 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
280 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
281
282 /* Round 3 */
283#define S31 4
284#define S32 11
285#define S33 16
286#define S34 23
287 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
288 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
289 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
290 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
291 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
292 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
293 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
294 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
295 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
296 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
297 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
298 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
299 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
300 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
301 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
302 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
303
304 /* Round 4 */
305#define S41 6
306#define S42 10
307#define S43 15
308#define S44 21
309 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
310 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
311 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
312 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
313 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
314 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
315 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
316 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
317 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
318 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
319 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
320 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
321 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
322 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
323 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
324 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
325
326 state[0] += a;
327 state[1] += b;
328 state[2] += c;
329 state[3] += d;
330
331 /* Zeroize sensitive information. */
332 memset ((void *)x, 0, sizeof (x));
333}