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 | * $Id: md5c.c,v 1.1 2005/06/24 22:47:12 curtisg 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 | #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5␊ |
40 | # include <Kernel/libkern/crypto/md5.h>␊ |
41 | #else␊ |
42 | # include <sys/md5.h>␊ |
43 | #endif␊ |
44 | ␊ |
45 | ␊ |
46 | #ifdef KERNEL␊ |
47 | #define memset(x,y,z)␉bzero(x,z);␊ |
48 | #define memcpy(x,y,z)␉bcopy(y, x, z)␊ |
49 | #endif␊ |
50 | ␊ |
51 | #if defined(__i386__) || defined(__alpha__)␊ |
52 | #define Encode memcpy␊ |
53 | #define Decode memcpy␊ |
54 | #else /* __i386__ */␊ |
55 | static void Encode (output, input, len);␊ |
56 | static void Decode (output, input, len);␊ |
57 | static void MD5Transform (state, block);␊ |
58 | /*␊ |
59 | * Encodes input (u_int32_t) into output (unsigned char). Assumes len is␊ |
60 | * a multiple of 4.␊ |
61 | */␊ |
62 | ␊ |
63 | /* XXX not prototyped, and not compatible with memcpy(). */␊ |
64 | static void␊ |
65 | Encode (output, input, len)␊ |
66 | ␉unsigned char *output;␊ |
67 | ␉u_int32_t *input;␊ |
68 | ␉unsigned int len;␊ |
69 | {␊ |
70 | ␉unsigned int i, j;␊ |
71 | ␊ |
72 | ␉for (i = 0, j = 0; j < len; i++, j += 4) {␊ |
73 | ␉␉output[j] = (unsigned char)(input[i] & 0xff);␊ |
74 | ␉␉output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);␊ |
75 | ␉␉output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);␊ |
76 | ␉␉output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);␊ |
77 | ␉}␊ |
78 | }␊ |
79 | ␊ |
80 | /*␊ |
81 | * Decodes input (unsigned char) into output (u_int32_t). Assumes len is␊ |
82 | * a multiple of 4.␊ |
83 | */␊ |
84 | ␊ |
85 | static void␊ |
86 | Decode (output, input, len)␊ |
87 | ␉u_int32_t *output;␊ |
88 | ␉const unsigned char *input;␊ |
89 | ␉unsigned int len;␊ |
90 | {␊ |
91 | ␉unsigned int i, j;␊ |
92 | ␊ |
93 | ␉for (i = 0, j = 0; j < len; i++, j += 4)␊ |
94 | ␉␉output[i] = ((u_int32_t)input[j]) | (((u_int32_t)input[j+1]) << 8) |␊ |
95 | ␉␉ (((u_int32_t)input[j+2]) << 16) | (((u_int32_t)input[j+3]) << 24);␊ |
96 | }␊ |
97 | #endif /* i386 */␊ |
98 | ␊ |
99 | static unsigned char PADDING[64] = {␊ |
100 | 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,␊ |
101 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,␊ |
102 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0␊ |
103 | };␊ |
104 | ␊ |
105 | /* F, G, H and I are basic MD5 functions. */␊ |
106 | #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))␊ |
107 | #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))␊ |
108 | #define H(x, y, z) ((x) ^ (y) ^ (z))␊ |
109 | #define I(x, y, z) ((y) ^ ((x) | (~z)))␊ |
110 | ␊ |
111 | /* ROTATE_LEFT rotates x left n bits. */␊ |
112 | #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))␊ |
113 | ␊ |
114 | /*␊ |
115 | * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.␊ |
116 | * Rotation is separate from addition to prevent recomputation.␊ |
117 | */␊ |
118 | #define FF(a, b, c, d, x, s, ac) { \␊ |
119 | ␉(a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \␊ |
120 | ␉(a) = ROTATE_LEFT ((a), (s)); \␊ |
121 | ␉(a) += (b); \␊ |
122 | ␉}␊ |
123 | #define GG(a, b, c, d, x, s, ac) { \␊ |
124 | ␉(a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \␊ |
125 | ␉(a) = ROTATE_LEFT ((a), (s)); \␊ |
126 | ␉(a) += (b); \␊ |
127 | ␉}␊ |
128 | #define HH(a, b, c, d, x, s, ac) { \␊ |
129 | ␉(a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \␊ |
130 | ␉(a) = ROTATE_LEFT ((a), (s)); \␊ |
131 | ␉(a) += (b); \␊ |
132 | ␉}␊ |
133 | #define II(a, b, c, d, x, s, ac) { \␊ |
134 | ␉(a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \␊ |
135 | ␉(a) = ROTATE_LEFT ((a), (s)); \␊ |
136 | ␉(a) += (b); \␊ |
137 | ␉}␊ |
138 | ␊ |
139 | static void MD5Transform (u_int32_t state[4], const unsigned char block[64]);␊ |
140 | ␊ |
141 | /* MD5 initialization. Begins an MD5 operation, writing a new context. */␊ |
142 | ␊ |
143 | void␊ |
144 | MD5Init (context)␊ |
145 | ␉MD5_CTX *context;␊ |
146 | {␊ |
147 | ␊ |
148 | ␉context->count[0] = context->count[1] = 0;␊ |
149 | ␊ |
150 | ␉/* Load magic initialization constants. */␊ |
151 | ␉context->state[0] = 0x67452301;␊ |
152 | ␉context->state[1] = 0xefcdab89;␊ |
153 | ␉context->state[2] = 0x98badcfe;␊ |
154 | ␉context->state[3] = 0x10325476;␊ |
155 | }␊ |
156 | ␊ |
157 | /* ␊ |
158 | * MD5 block update operation. Continues an MD5 message-digest␊ |
159 | * operation, processing another message block, and updating the␊ |
160 | * context.␊ |
161 | */␊ |
162 | ␊ |
163 | void␊ |
164 | MD5Update (context, input, inputLen)␊ |
165 | ␉MD5_CTX *context;␊ |
166 | #if MAC_OS_X_VERSION_MAX_ALLOWED >= MAC_OS_X_VERSION_10_5␊ |
167 | ␉const void *input;␊ |
168 | #else␊ |
169 | ␉const unsigned char *input;␊ |
170 | #endif␊ |
171 | ␉unsigned int inputLen;␊ |
172 | {␊ |
173 | ␉unsigned int i, index, partLen;␊ |
174 | ␊ |
175 | ␉/* Compute number of bytes mod 64 */␊ |
176 | ␉index = (unsigned int)((context->count[0] >> 3) & 0x3F);␊ |
177 | ␊ |
178 | ␉/* Update number of bits */␊ |
179 | ␉if ((context->count[0] += ((u_int32_t)inputLen << 3))␊ |
180 | ␉ < ((u_int32_t)inputLen << 3))␊ |
181 | ␉␉context->count[1]++;␊ |
182 | ␉context->count[1] += ((u_int32_t)inputLen >> 29);␊ |
183 | ␊ |
184 | ␉partLen = 64 - index;␊ |
185 | ␊ |
186 | ␉/* Transform as many times as possible. */␊ |
187 | ␉if (inputLen >= partLen) {␊ |
188 | ␉␉memcpy((void *)&context->buffer[index], (const void *)input,␊ |
189 | ␉␉ partLen);␊ |
190 | ␉␉MD5Transform (context->state, context->buffer);␊ |
191 | ␊ |
192 | ␉␉for (i = partLen; i + 63 < inputLen; i += 64)␊ |
193 | ␉␉␉MD5Transform (context->state, &((const unsigned char *)input)[i]);␊ |
194 | ␊ |
195 | ␉␉index = 0;␊ |
196 | ␉}␊ |
197 | ␉else␊ |
198 | ␉␉i = 0;␊ |
199 | ␊ |
200 | ␉/* Buffer remaining input */␊ |
201 | ␉memcpy ((void *)&context->buffer[index], (const void *)&((const unsigned char*)input)[i],␊ |
202 | ␉ inputLen-i);␊ |
203 | }␊ |
204 | ␊ |
205 | /*␊ |
206 | * MD5 padding. Adds padding followed by original length.␊ |
207 | */␊ |
208 | ␊ |
209 | void␊ |
210 | MD5Pad (context)␊ |
211 | ␉MD5_CTX *context;␊ |
212 | {␊ |
213 | ␉unsigned char bits[8];␊ |
214 | ␉unsigned int index, padLen;␊ |
215 | ␊ |
216 | ␉/* Save number of bits */␊ |
217 | ␉Encode (bits, context->count, 8);␊ |
218 | ␊ |
219 | ␉/* Pad out to 56 mod 64. */␊ |
220 | ␉index = (unsigned int)((context->count[0] >> 3) & 0x3f);␊ |
221 | ␉padLen = (index < 56) ? (56 - index) : (120 - index);␊ |
222 | ␉MD5Update (context, PADDING, padLen);␊ |
223 | ␊ |
224 | ␉/* Append length (before padding) */␊ |
225 | ␉MD5Update (context, bits, 8);␊ |
226 | }␊ |
227 | ␊ |
228 | /*␊ |
229 | * MD5 finalization. Ends an MD5 message-digest operation, writing the␊ |
230 | * the message digest and zeroizing the context.␊ |
231 | */␊ |
232 | ␊ |
233 | void␊ |
234 | MD5Final (digest, context)␊ |
235 | ␉unsigned char digest[16];␊ |
236 | ␉MD5_CTX *context;␊ |
237 | {␊ |
238 | ␉/* Do padding. */␊ |
239 | ␉MD5Pad (context);␊ |
240 | ␊ |
241 | ␉/* Store state in digest */␊ |
242 | ␉Encode (digest, context->state, 16);␊ |
243 | ␊ |
244 | ␉/* Zeroize sensitive information. */␊ |
245 | ␉memset ((void *)context, 0, sizeof (*context));␊ |
246 | }␊ |
247 | ␊ |
248 | /* MD5 basic transformation. Transforms state based on block. */␊ |
249 | ␊ |
250 | static void␊ |
251 | MD5Transform (state, block)␊ |
252 | ␉u_int32_t state[4];␊ |
253 | ␉const unsigned char block[64];␊ |
254 | {␊ |
255 | ␉u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];␊ |
256 | ␊ |
257 | ␉Decode (x, block, 64);␊ |
258 | ␊ |
259 | ␉/* Round 1 */␊ |
260 | #define S11 7␊ |
261 | #define S12 12␊ |
262 | #define S13 17␊ |
263 | #define S14 22␊ |
264 | ␉FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */␊ |
265 | ␉FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */␊ |
266 | ␉FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */␊ |
267 | ␉FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */␊ |
268 | ␉FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */␊ |
269 | ␉FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */␊ |
270 | ␉FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */␊ |
271 | ␉FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */␊ |
272 | ␉FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */␊ |
273 | ␉FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */␊ |
274 | ␉FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */␊ |
275 | ␉FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */␊ |
276 | ␉FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */␊ |
277 | ␉FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */␊ |
278 | ␉FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */␊ |
279 | ␉FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */␊ |
280 | ␊ |
281 | ␉/* Round 2 */␊ |
282 | #define S21 5␊ |
283 | #define S22 9␊ |
284 | #define S23 14␊ |
285 | #define S24 20␊ |
286 | ␉GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */␊ |
287 | ␉GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */␊ |
288 | ␉GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */␊ |
289 | ␉GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */␊ |
290 | ␉GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */␊ |
291 | ␉GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */␊ |
292 | ␉GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */␊ |
293 | ␉GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */␊ |
294 | ␉GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */␊ |
295 | ␉GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */␊ |
296 | ␉GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */␊ |
297 | ␉GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */␊ |
298 | ␉GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */␊ |
299 | ␉GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */␊ |
300 | ␉GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */␊ |
301 | ␉GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */␊ |
302 | ␊ |
303 | ␉/* Round 3 */␊ |
304 | #define S31 4␊ |
305 | #define S32 11␊ |
306 | #define S33 16␊ |
307 | #define S34 23␊ |
308 | ␉HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */␊ |
309 | ␉HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */␊ |
310 | ␉HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */␊ |
311 | ␉HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */␊ |
312 | ␉HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */␊ |
313 | ␉HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */␊ |
314 | ␉HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */␊ |
315 | ␉HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */␊ |
316 | ␉HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */␊ |
317 | ␉HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */␊ |
318 | ␉HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */␊ |
319 | ␉HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */␊ |
320 | ␉HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */␊ |
321 | ␉HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */␊ |
322 | ␉HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */␊ |
323 | ␉HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */␊ |
324 | ␊ |
325 | ␉/* Round 4 */␊ |
326 | #define S41 6␊ |
327 | #define S42 10␊ |
328 | #define S43 15␊ |
329 | #define S44 21␊ |
330 | ␉II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */␊ |
331 | ␉II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */␊ |
332 | ␉II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */␊ |
333 | ␉II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */␊ |
334 | ␉II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */␊ |
335 | ␉II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */␊ |
336 | ␉II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */␊ |
337 | ␉II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */␊ |
338 | ␉II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */␊ |
339 | ␉II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */␊ |
340 | ␉II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */␊ |
341 | ␉II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */␊ |
342 | ␉II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */␊ |
343 | ␉II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */␊ |
344 | ␉II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */␊ |
345 | ␉II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */␊ |
346 | ␊ |
347 | ␉state[0] += a;␊ |
348 | ␉state[1] += b;␊ |
349 | ␉state[2] += c;␊ |
350 | ␉state[3] += d;␊ |
351 | ␊ |
352 | ␉/* Zeroize sensitive information. */␊ |
353 | ␉memset ((void *)x, 0, sizeof (x));␊ |
354 | }␊ |
355 | |