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[dragonfly.git] / sys / kern / md5c.c
CommitLineData
984263bc
MD
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 *
25 * $FreeBSD: src/sys/kern/md5c.c,v 1.17 1999/12/29 04:54:39 peter Exp $
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
31#include <sys/types.h>
32
33#ifdef _KERNEL
34#include <sys/systm.h>
35#else
36#include <string.h>
37#endif
38
39#include <sys/md5.h>
40
41
42#ifdef _KERNEL
43#define memset(x,y,z) bzero(x,z);
44#define memcpy(x,y,z) bcopy(y, x, z)
45#endif
46
47#if defined(__i386__) || defined(__alpha__)
48#define Encode memcpy
49#define Decode memcpy
50#else /* __i386__ */
51
52/*
53 * Encodes input (u_int32_t) into output (unsigned char). Assumes len is
54 * a multiple of 4.
55 */
56
57/* XXX not prototyped, and not compatible with memcpy(). */
58static void
59Encode (output, input, len)
60 unsigned char *output;
61 u_int32_t *input;
62 unsigned int len;
63{
64 unsigned int i, j;
65
66 for (i = 0, j = 0; j < len; i++, j += 4) {
67 output[j] = (unsigned char)(input[i] & 0xff);
68 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
69 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
70 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
71 }
72}
73
74/*
75 * Decodes input (unsigned char) into output (u_int32_t). Assumes len is
76 * a multiple of 4.
77 */
78
79static void
80Decode (output, input, len)
81 u_int32_t *output;
82 const unsigned char *input;
83 unsigned int len;
84{
85 unsigned int i, j;
86
87 for (i = 0, j = 0; j < len; i++, j += 4)
88 output[i] = ((u_int32_t)input[j]) | (((u_int32_t)input[j+1]) << 8) |
89 (((u_int32_t)input[j+2]) << 16) | (((u_int32_t)input[j+3]) << 24);
90}
91#endif /* i386 */
92
93static unsigned char PADDING[64] = {
94 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
95 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
96 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
97};
98
99/* F, G, H and I are basic MD5 functions. */
100#define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
101#define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
102#define H(x, y, z) ((x) ^ (y) ^ (z))
103#define I(x, y, z) ((y) ^ ((x) | (~z)))
104
105/* ROTATE_LEFT rotates x left n bits. */
106#define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
107
108/*
109 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
110 * Rotation is separate from addition to prevent recomputation.
111 */
112#define FF(a, b, c, d, x, s, ac) { \
113 (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
114 (a) = ROTATE_LEFT ((a), (s)); \
115 (a) += (b); \
116 }
117#define GG(a, b, c, d, x, s, ac) { \
118 (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
119 (a) = ROTATE_LEFT ((a), (s)); \
120 (a) += (b); \
121 }
122#define HH(a, b, c, d, x, s, ac) { \
123 (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
124 (a) = ROTATE_LEFT ((a), (s)); \
125 (a) += (b); \
126 }
127#define II(a, b, c, d, x, s, ac) { \
128 (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
129 (a) = ROTATE_LEFT ((a), (s)); \
130 (a) += (b); \
131 }
132
133/* MD5 initialization. Begins an MD5 operation, writing a new context. */
134
135void
136MD5Init (context)
137 MD5_CTX *context;
138{
139
140 context->count[0] = context->count[1] = 0;
141
142 /* Load magic initialization constants. */
143 context->state[0] = 0x67452301;
144 context->state[1] = 0xefcdab89;
145 context->state[2] = 0x98badcfe;
146 context->state[3] = 0x10325476;
147}
148
149/*
150 * MD5 block update operation. Continues an MD5 message-digest
151 * operation, processing another message block, and updating the
152 * context.
153 */
154
155void
156MD5Update (context, input, inputLen)
157 MD5_CTX *context;
158 const unsigned char *input;
159 unsigned int inputLen;
160{
161 unsigned int i, index, partLen;
162
163 /* Compute number of bytes mod 64 */
164 index = (unsigned int)((context->count[0] >> 3) & 0x3F);
165
166 /* Update number of bits */
167 if ((context->count[0] += ((u_int32_t)inputLen << 3))
168 < ((u_int32_t)inputLen << 3))
169 context->count[1]++;
170 context->count[1] += ((u_int32_t)inputLen >> 29);
171
172 partLen = 64 - index;
173
174 /* Transform as many times as possible. */
175 if (inputLen >= partLen) {
176 memcpy((void *)&context->buffer[index], (const void *)input,
177 partLen);
178 MD5Transform (context->state, context->buffer);
179
180 for (i = partLen; i + 63 < inputLen; i += 64)
181 MD5Transform (context->state, &input[i]);
182
183 index = 0;
184 }
185 else
186 i = 0;
187
188 /* Buffer remaining input */
189 memcpy ((void *)&context->buffer[index], (const void *)&input[i],
190 inputLen-i);
191}
192
193/*
194 * MD5 padding. Adds padding followed by original length.
195 */
196
197void
198MD5Pad (context)
199 MD5_CTX *context;
200{
201 unsigned char bits[8];
202 unsigned int index, padLen;
203
204 /* Save number of bits */
205 Encode (bits, context->count, 8);
206
207 /* Pad out to 56 mod 64. */
208 index = (unsigned int)((context->count[0] >> 3) & 0x3f);
209 padLen = (index < 56) ? (56 - index) : (120 - index);
210 MD5Update (context, PADDING, padLen);
211
212 /* Append length (before padding) */
213 MD5Update (context, bits, 8);
214}
215
216/*
217 * MD5 finalization. Ends an MD5 message-digest operation, writing the
218 * the message digest and zeroizing the context.
219 */
220
221void
222MD5Final (digest, context)
223 unsigned char digest[16];
224 MD5_CTX *context;
225{
226 /* Do padding. */
227 MD5Pad (context);
228
229 /* Store state in digest */
230 Encode (digest, context->state, 16);
231
232 /* Zeroize sensitive information. */
233 memset ((void *)context, 0, sizeof (*context));
234}
235
236/* MD5 basic transformation. Transforms state based on block. */
237
238void
239MD5Transform (state, block)
240 u_int32_t state[4];
241 const unsigned char block[64];
242{
243 u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
244
245 Decode (x, block, 64);
246
247 /* Round 1 */
248#define S11 7
249#define S12 12
250#define S13 17
251#define S14 22
252 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
253 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
254 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
255 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
256 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
257 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
258 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
259 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
260 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
261 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
262 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
263 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
264 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
265 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
266 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
267 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
268
269 /* Round 2 */
270#define S21 5
271#define S22 9
272#define S23 14
273#define S24 20
274 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
275 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
276 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
277 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
278 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
279 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
280 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
281 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
282 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
283 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
284 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
285 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
286 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
287 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
288 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
289 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
290
291 /* Round 3 */
292#define S31 4
293#define S32 11
294#define S33 16
295#define S34 23
296 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
297 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
298 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
299 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
300 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
301 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
302 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
303 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
304 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
305 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
306 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
307 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
308 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
309 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
310 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
311 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
312
313 /* Round 4 */
314#define S41 6
315#define S42 10
316#define S43 15
317#define S44 21
318 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
319 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
320 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
321 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
322 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
323 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
324 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
325 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
326 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
327 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
328 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
329 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
330 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
331 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
332 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
333 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
334
335 state[0] += a;
336 state[1] += b;
337 state[2] += c;
338 state[3] += d;
339
340 /* Zeroize sensitive information. */
341 memset ((void *)x, 0, sizeof (x));
342}