xref: /dragonfly/sys/kern/md5c.c (revision f746689a)
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 1.27 2006/03/30 18:45:50 pjd Exp $
26  * $DragonFly: src/sys/kern/md5c.c,v 1.5 2008/09/11 20:25:34 swildner Exp $
27  *
28  * This code is the same as the code published by RSA Inc.  It has been
29  * edited for clarity and style only.
30  */
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 #if (BYTE_ORDER == LITTLE_ENDIAN)
45 #define Encode memcpy
46 #define Decode memcpy
47 #else
48 
49 /*
50  * Encodes input (u_int32_t) into output (unsigned char). Assumes len is
51  * a multiple of 4.
52  */
53 
54 static void
55 Encode (unsigned char *output, u_int32_t *input, unsigned int len)
56 {
57 	unsigned int i;
58 	uint32_t ip;
59 
60 	for (i = 0; i < len / 4; i++) {
61 		ip = input[i];
62 		*output++ = ip;
63 		*output++ = ip >> 8;
64 		*output++ = ip >> 16;
65 		*output++ = ip >> 24;
66 	}
67 }
68 
69 /*
70  * Decodes input (unsigned char) into output (u_int32_t). Assumes len is
71  * a multiple of 4.
72  */
73 
74 static void
75 Decode (u_int32_t *output, const unsigned char *input, unsigned int len)
76 {
77 	unsigned int i;
78 
79 	for (i = 0; i < len; i += 4) {
80 		*output++ = input[i] | (input[i+1] << 8) | (input[i+2] << 16) |
81 		    (input[i+3] << 24);
82 	}
83 }
84 #endif
85 
86 static unsigned char PADDING[64] = {
87   0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
88   0, 0, 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
90 };
91 
92 /* F, G, H and I are basic MD5 functions. */
93 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
94 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
95 #define H(x, y, z) ((x) ^ (y) ^ (z))
96 #define I(x, y, z) ((y) ^ ((x) | (~z)))
97 
98 /* ROTATE_LEFT rotates x left n bits. */
99 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
100 
101 /*
102  * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
103  * Rotation is separate from addition to prevent recomputation.
104  */
105 #define FF(a, b, c, d, x, s, ac) { \
106 	(a) += F ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
107 	(a) = ROTATE_LEFT ((a), (s)); \
108 	(a) += (b); \
109 	}
110 #define GG(a, b, c, d, x, s, ac) { \
111 	(a) += G ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
112 	(a) = ROTATE_LEFT ((a), (s)); \
113 	(a) += (b); \
114 	}
115 #define HH(a, b, c, d, x, s, ac) { \
116 	(a) += H ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
117 	(a) = ROTATE_LEFT ((a), (s)); \
118 	(a) += (b); \
119 	}
120 #define II(a, b, c, d, x, s, ac) { \
121 	(a) += I ((b), (c), (d)) + (x) + (u_int32_t)(ac); \
122 	(a) = ROTATE_LEFT ((a), (s)); \
123 	(a) += (b); \
124 	}
125 
126 /* MD5 initialization. Begins an MD5 operation, writing a new context. */
127 
128 void
129 MD5Init (MD5_CTX *context)
130 {
131 
132 	context->count[0] = context->count[1] = 0;
133 
134 	/* Load magic initialization constants.  */
135 	context->state[0] = 0x67452301;
136 	context->state[1] = 0xefcdab89;
137 	context->state[2] = 0x98badcfe;
138 	context->state[3] = 0x10325476;
139 }
140 
141 /*
142  * MD5 block update operation. Continues an MD5 message-digest
143  * operation, processing another message block, and updating the
144  * context.
145  */
146 
147 void
148 MD5Update (MD5_CTX *context, const void *in, unsigned int inputLen)
149 {
150 	unsigned int i, index, partLen;
151 	const unsigned char *input = in;
152 
153 	/* Compute number of bytes mod 64 */
154 	index = (unsigned int)((context->count[0] >> 3) & 0x3F);
155 
156 	/* Update number of bits */
157 	if ((context->count[0] += ((u_int32_t)inputLen << 3))
158 	    < ((u_int32_t)inputLen << 3))
159 		context->count[1]++;
160 	context->count[1] += ((u_int32_t)inputLen >> 29);
161 
162 	partLen = 64 - index;
163 
164 	/* Transform as many times as possible. */
165 	if (inputLen >= partLen) {
166 		memcpy((void *)&context->buffer[index], (const void *)input,
167 		    partLen);
168 		MD5Transform (context->state, context->buffer);
169 
170 		for (i = partLen; i + 63 < inputLen; i += 64)
171 			MD5Transform (context->state, &input[i]);
172 
173 		index = 0;
174 	}
175 	else
176 		i = 0;
177 
178 	/* Buffer remaining input */
179 	memcpy ((void *)&context->buffer[index], (const void *)&input[i],
180 	    inputLen-i);
181 }
182 
183 /*
184  * MD5 padding. Adds padding followed by original length.
185  */
186 
187 void
188 MD5Pad (MD5_CTX *context)
189 {
190 	unsigned char bits[8];
191 	unsigned int index, padLen;
192 
193 	/* Save number of bits */
194 	Encode (bits, context->count, 8);
195 
196 	/* Pad out to 56 mod 64. */
197 	index = (unsigned int)((context->count[0] >> 3) & 0x3f);
198 	padLen = (index < 56) ? (56 - index) : (120 - index);
199 	MD5Update (context, PADDING, padLen);
200 
201 	/* Append length (before padding) */
202 	MD5Update (context, bits, 8);
203 }
204 
205 /*
206  * MD5 finalization. Ends an MD5 message-digest operation, writing the
207  * the message digest and zeroizing the context.
208  */
209 
210 void
211 MD5Final (unsigned char digest[16], MD5_CTX *context)
212 {
213 	/* Do padding. */
214 	MD5Pad (context);
215 
216 	/* Store state in digest */
217 	Encode (digest, context->state, 16);
218 
219 	/* Zeroize sensitive information. */
220 	memset ((void *)context, 0, sizeof (*context));
221 }
222 
223 /* MD5 basic transformation. Transforms state based on block. */
224 
225 void
226 MD5Transform (u_int32_t state[4], const unsigned char block[64])
227 {
228 	u_int32_t a = state[0], b = state[1], c = state[2], d = state[3], x[16];
229 
230 	Decode (x, block, 64);
231 
232 	/* Round 1 */
233 #define S11 7
234 #define S12 12
235 #define S13 17
236 #define S14 22
237 	FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
238 	FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
239 	FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
240 	FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
241 	FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
242 	FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
243 	FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
244 	FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
245 	FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
246 	FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
247 	FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
248 	FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
249 	FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
250 	FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
251 	FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
252 	FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
253 
254 	/* Round 2 */
255 #define S21 5
256 #define S22 9
257 #define S23 14
258 #define S24 20
259 	GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
260 	GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
261 	GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
262 	GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
263 	GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
264 	GG (d, a, b, c, x[10], S22,  0x2441453); /* 22 */
265 	GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
266 	GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
267 	GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
268 	GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
269 	GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
270 	GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
271 	GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
272 	GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
273 	GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
274 	GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
275 
276 	/* Round 3 */
277 #define S31 4
278 #define S32 11
279 #define S33 16
280 #define S34 23
281 	HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
282 	HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
283 	HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
284 	HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
285 	HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
286 	HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
287 	HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
288 	HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
289 	HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
290 	HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
291 	HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
292 	HH (b, c, d, a, x[ 6], S34,  0x4881d05); /* 44 */
293 	HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
294 	HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
295 	HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
296 	HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
297 
298 	/* Round 4 */
299 #define S41 6
300 #define S42 10
301 #define S43 15
302 #define S44 21
303 	II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
304 	II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
305 	II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
306 	II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
307 	II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
308 	II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
309 	II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
310 	II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
311 	II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
312 	II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
313 	II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
314 	II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
315 	II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
316 	II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
317 	II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
318 	II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
319 
320 	state[0] += a;
321 	state[1] += b;
322 	state[2] += c;
323 	state[3] += d;
324 
325 	/* Zeroize sensitive information. */
326 	memset ((void *)x, 0, sizeof (x));
327 }
328