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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 | * | |
3cd01911 | 25 | * $FreeBSD: src/sys/kern/md5c.c,v 1.27 2006/03/30 18:45:50 pjd Exp $ |
984263bc MD |
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 | */ | |
984263bc MD |
34 | #include <sys/types.h> |
35 | ||
36 | #ifdef _KERNEL | |
37 | #include <sys/systm.h> | |
38 | #else | |
39 | #include <string.h> | |
40 | #endif | |
41 | ||
3cd01911 SW |
42 | #include <machine/endian.h> |
43 | #include <sys/endian.h> | |
984263bc MD |
44 | #include <sys/md5.h> |
45 | ||
b5d7e50f | 46 | static void __kern__MD5Transform(u_int32_t [4], const unsigned char [64]); |
381f866e | 47 | |
3cd01911 | 48 | #if (BYTE_ORDER == LITTLE_ENDIAN) |
984263bc MD |
49 | #define Encode memcpy |
50 | #define Decode memcpy | |
3cd01911 | 51 | #else |
984263bc MD |
52 | |
53 | /* | |
54 | * Encodes input (u_int32_t) into output (unsigned char). Assumes len is | |
55 | * a multiple of 4. | |
56 | */ | |
57 | ||
984263bc | 58 | static void |
fbda7fa6 | 59 | Encode (unsigned char *output, u_int32_t *input, unsigned int len) |
984263bc | 60 | { |
3cd01911 SW |
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; | |
984263bc MD |
70 | } |
71 | } | |
72 | ||
73 | /* | |
74 | * Decodes input (unsigned char) into output (u_int32_t). Assumes len is | |
75 | * a multiple of 4. | |
76 | */ | |
77 | ||
78 | static void | |
fbda7fa6 | 79 | Decode (u_int32_t *output, const unsigned char *input, unsigned int len) |
984263bc | 80 | { |
3cd01911 | 81 | unsigned int i; |
984263bc | 82 | |
3cd01911 SW |
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 |
984263bc MD |
89 | |
90 | static 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 | 132 | int |
fbda7fa6 | 133 | MD5Init (MD5_CTX *context) |
984263bc MD |
134 | { |
135 | ||
0fe46dc6 | 136 | context->Nl = context->Nh = 0; |
984263bc MD |
137 | |
138 | /* Load magic initialization constants. */ | |
0fe46dc6 MD |
139 | context->A = 0x67452301; |
140 | context->B = 0xefcdab89; | |
141 | context->C = 0x98badcfe; | |
142 | context->D = 0x10325476; | |
143 | ||
144 | return 1; | |
984263bc MD |
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 | ||
153 | void | |
3cd01911 | 154 | MD5Update (MD5_CTX *context, const void *in, unsigned int inputLen) |
984263bc MD |
155 | { |
156 | unsigned int i, index, partLen; | |
3cd01911 | 157 | const unsigned char *input = in; |
984263bc MD |
158 | |
159 | /* Compute number of bytes mod 64 */ | |
0fe46dc6 | 160 | index = (unsigned int)((context->Nl >> 3) & 0x3F); |
984263bc MD |
161 | |
162 | /* Update number of bits */ | |
0fe46dc6 | 163 | if ((context->Nl += ((u_int32_t)inputLen << 3)) |
984263bc | 164 | < ((u_int32_t)inputLen << 3)) |
0fe46dc6 MD |
165 | context->Nh++; |
166 | context->Nh += ((u_int32_t)inputLen >> 29); | |
984263bc MD |
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); |
984263bc MD |
175 | |
176 | for (i = partLen; i + 63 < inputLen; i += 64) | |
b5d7e50f | 177 | __kern__MD5Transform (&context->A, &input[i]); |
984263bc MD |
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], |
984263bc MD |
186 | inputLen-i); |
187 | } | |
188 | ||
189 | /* | |
190 | * MD5 padding. Adds padding followed by original length. | |
191 | */ | |
192 | ||
381f866e | 193 | static void |
b5d7e50f | 194 | __kern__MD5Pad (MD5_CTX *context) |
984263bc MD |
195 | { |
196 | unsigned char bits[8]; | |
197 | unsigned int index, padLen; | |
198 | ||
199 | /* Save number of bits */ | |
0fe46dc6 | 200 | Encode (bits, &context->Nl, 8); |
984263bc MD |
201 | |
202 | /* Pad out to 56 mod 64. */ | |
0fe46dc6 | 203 | index = (unsigned int)((context->Nl >> 3) & 0x3f); |
984263bc MD |
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 | ||
216 | void | |
fbda7fa6 | 217 | MD5Final (unsigned char digest[16], MD5_CTX *context) |
984263bc MD |
218 | { |
219 | /* Do padding. */ | |
b5d7e50f | 220 | __kern__MD5Pad (context); |
984263bc MD |
221 | |
222 | /* Store state in digest */ | |
0fe46dc6 | 223 | Encode (digest, &context->A, 16); |
984263bc MD |
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 | 231 | static void |
b5d7e50f | 232 | __kern__MD5Transform (u_int32_t state[4], const unsigned char block[64]) |
984263bc MD |
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 | } |