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 * This code is the same as the code published by RSA Inc. It has been
26 * edited for clarity and style only.
27 */
28
29 #include <sys/cdefs.h>
30 __FBSDID("$FreeBSD$");
31
32 #include <sys/types.h>
33
34 #ifdef _KERNEL
35 #include <sys/systm.h>
36 #else
37 #include <string.h>
38 #endif
39
40 #include <machine/endian.h>
41 #include <sys/endian.h>
42 #include <sys/md5.h>
43
44 static void MD5Transform(u_int32_t [4], const unsigned char [64]);
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 (BYTE_ORDER == LITTLE_ENDIAN)
52 #define Encode memcpy
53 #define Decode memcpy
54 #else
55
56 /*
57 * Encodes input (u_int32_t) into output (unsigned char). Assumes len is
58 * a multiple of 4.
59 */
60
61 static void
Encode(unsigned char * output,u_int32_t * input,unsigned int len)62 Encode (unsigned char *output, u_int32_t *input, unsigned int len)
63 {
64 unsigned int i;
65 u_int32_t *op = (u_int32_t *)output;
66
67 for (i = 0; i < len / 4; i++)
68 op[i] = htole32(input[i]);
69 }
70
71 /*
72 * Decodes input (unsigned char) into output (u_int32_t). Assumes len is
73 * a multiple of 4.
74 */
75
76 static void
Decode(u_int32_t * output,const unsigned char * input,unsigned int len)77 Decode (u_int32_t *output, const unsigned char *input, unsigned int len)
78 {
79 unsigned int i;
80 const u_int32_t *ip = (const u_int32_t *)input;
81
82 for (i = 0; i < len / 4; i++)
83 output[i] = le32toh(ip[i]);
84 }
85 #endif
86
87 static unsigned char PADDING[64] = {
88 0x80, 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, 0, 0, 0, 0,
90 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
91 };
92
93 /* F, G, H and I are basic MD5 functions. */
94 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
95 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
96 #define H(x, y, z) ((x) ^ (y) ^ (z))
97 #define I(x, y, z) ((y) ^ ((x) | (~z)))
98
99 /* ROTATE_LEFT rotates x left n bits. */
100 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
101
102 /*
103 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
104 * Rotation is separate from addition to prevent recomputation.
105 */
106 #define FF(a, b, c, d, x, s, ac) { \
107 (a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
108 (a) = ROTATE_LEFT ((a), (s)); \
109 (a) += (b); \
110 }
111 #define GG(a, b, c, d, x, s, ac) { \
112 (a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
113 (a) = ROTATE_LEFT ((a), (s)); \
114 (a) += (b); \
115 }
116 #define HH(a, b, c, d, x, s, ac) { \
117 (a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
118 (a) = ROTATE_LEFT ((a), (s)); \
119 (a) += (b); \
120 }
121 #define II(a, b, c, d, x, s, ac) { \
122 (a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
123 (a) = ROTATE_LEFT ((a), (s)); \
124 (a) += (b); \
125 }
126
127 /* MD5 initialization. Begins an MD5 operation, writing a new context. */
128
129 void
MD5Init(context)130 MD5Init (context)
131 MD5_CTX *context;
132 {
133
134 context->count[0] = context->count[1] = 0;
135
136 /* Load magic initialization constants. */
137 context->state[0] = 0x67452301;
138 context->state[1] = 0xefcdab89;
139 context->state[2] = 0x98badcfe;
140 context->state[3] = 0x10325476;
141 }
142
143 /*
144 * MD5 block update operation. Continues an MD5 message-digest
145 * operation, processing another message block, and updating the
146 * context.
147 */
148
149 void
MD5Update(context,in,inputLen)150 MD5Update (context, in, inputLen)
151 MD5_CTX *context;
152 const void *in;
153 unsigned int inputLen;
154 {
155 unsigned int i, idx, partLen;
156 const unsigned char *input = in;
157
158 /* Compute number of bytes mod 64 */
159 idx = (unsigned int)((context->count[0] >> 3) & 0x3F);
160
161 /* Update number of bits */
162 if ((context->count[0] += ((u_int32_t)inputLen << 3))
163 < ((u_int32_t)inputLen << 3))
164 context->count[1]++;
165 context->count[1] += ((u_int32_t)inputLen >> 29);
166
167 partLen = 64 - idx;
168
169 /* Transform as many times as possible. */
170 if (inputLen >= partLen) {
171 memcpy((void *)&context->buffer[idx], (const void *)input,
172 partLen);
173 MD5Transform (context->state, context->buffer);
174
175 for (i = partLen; i + 63 < inputLen; i += 64)
176 MD5Transform (context->state, &input[i]);
177
178 idx = 0;
179 }
180 else
181 i = 0;
182
183 /* Buffer remaining input */
184 memcpy ((void *)&context->buffer[idx], (const void *)&input[i],
185 inputLen-i);
186 }
187
188 /*
189 * MD5 padding. Adds padding followed by original length.
190 */
191
192 void
MD5Pad(context)193 MD5Pad (context)
194 MD5_CTX *context;
195 {
196 unsigned char bits[8];
197 unsigned int idx, padLen;
198
199 /* Save number of bits */
200 Encode (bits, context->count, 8);
201
202 /* Pad out to 56 mod 64. */
203 idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
204 padLen = (idx < 56) ? (56 - idx) : (120 - idx);
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
MD5Final(digest,context)217 MD5Final (digest, context)
218 unsigned char digest[16];
219 MD5_CTX *context;
220 {
221 /* Do padding. */
222 MD5Pad (context);
223
224 /* Store state in digest */
225 Encode (digest, context->state, 16);
226
227 /* Zeroize sensitive information. */
228 memset ((void *)context, 0, sizeof (*context));
229 }
230
231 /* MD5 basic transformation. Transforms state based on block. */
232
233 static void
MD5Transform(state,block)234 MD5Transform (state, block)
235 u_int32_t state[4];
236 const unsigned char block[64];
237 {
238 u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
239
240 Decode (x, block, 64);
241
242 /* Round 1 */
243 #define S11 7
244 #define S12 12
245 #define S13 17
246 #define S14 22
247 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
248 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
249 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
250 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
251 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
252 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
253 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
254 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
255 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
256 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
257 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
258 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
259 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
260 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
261 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
262 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
263
264 /* Round 2 */
265 #define S21 5
266 #define S22 9
267 #define S23 14
268 #define S24 20
269 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
270 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
271 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
272 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
273 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
274 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
275 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
276 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
277 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
278 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
279 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
280 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
281 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
282 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
283 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
284 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
285
286 /* Round 3 */
287 #define S31 4
288 #define S32 11
289 #define S33 16
290 #define S34 23
291 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
292 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
293 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
294 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
295 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
296 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
297 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
298 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
299 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
300 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
301 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
302 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
303 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
304 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
305 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
306 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
307
308 /* Round 4 */
309 #define S41 6
310 #define S42 10
311 #define S43 15
312 #define S44 21
313 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
314 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
315 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
316 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
317 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
318 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
319 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
320 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
321 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
322 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
323 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
324 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
325 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
326 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
327 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
328 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
329
330 state[0] += a;
331 state[1] += b;
332 state[2] += c;
333 state[3] += d;
334
335 /* Zeroize sensitive information. */
336 memset ((void *)x, 0, sizeof (x));
337 }
338