1 /* $NetBSD: md5c.c,v 1.2 2016/06/14 20:47:08 agc Exp $ */
2
3 /*
4 * This file is derived from the RSA Data Security, Inc. MD5 Message-Digest
5 * Algorithm and has been modified by Jason R. Thorpe <thorpej@NetBSD.org>
6 * for portability and formatting.
7 */
8
9 /*
10 * Copyright (C) 1991-2, RSA Data Security, Inc. Created 1991. All
11 * rights reserved.
12 *
13 * License to copy and use this software is granted provided that it
14 * is identified as the "RSA Data Security, Inc. MD5 Message-Digest
15 * Algorithm" in all material mentioning or referencing this software
16 * or this function.
17 *
18 * License is also granted to make and use derivative works provided
19 * that such works are identified as "derived from the RSA Data
20 * Security, Inc. MD5 Message-Digest Algorithm" in all material
21 * mentioning or referencing the derived work.
22 *
23 * RSA Data Security, Inc. makes no representations concerning either
24 * the merchantability of this software or the suitability of this
25 * software for any particular purpose. It is provided "as is"
26 * without express or implied warranty of any kind.
27 *
28 * These notices must be retained in any copies of any part of this
29 * documentation and/or software.
30 */
31
32 #include <sys/types.h>
33 #include <assert.h>
34 #include <string.h>
35
36 #include "md5.h"
37
38 #if !HAVE_MD5_H
39
40 #define ZEROIZE(d, l) memset((d), 0, (l))
41
42 typedef unsigned char *POINTER;
43 typedef uint16_t UINT2;
44 typedef uint32_t UINT4;
45
46 /*
47 * Constants for MD5Transform routine.
48 */
49 #define S11 7
50 #define S12 12
51 #define S13 17
52 #define S14 22
53 #define S21 5
54 #define S22 9
55 #define S23 14
56 #define S24 20
57 #define S31 4
58 #define S32 11
59 #define S33 16
60 #define S34 23
61 #define S41 6
62 #define S42 10
63 #define S43 15
64 #define S44 21
65
66 static void MD5Transform(UINT4 [4], const unsigned char [64]);
67
68 static void Encode(unsigned char *, UINT4 *, unsigned int);
69 static void Decode(UINT4 *, const unsigned char *, unsigned int);
70
71 /*
72 * Encodes input (UINT4) into output (unsigned char). Assumes len is
73 * a multiple of 4.
74 */
75 static void
Encode(unsigned char * output,UINT4 * input,unsigned int len)76 Encode (unsigned char *output,
77 UINT4 *input,
78 unsigned int len)
79 {
80 unsigned int i, j;
81
82 for (i = 0, j = 0; j < len; i++, j += 4) {
83 output[j] = (unsigned char)(input[i] & 0xff);
84 output[j+1] = (unsigned char)((input[i] >> 8) & 0xff);
85 output[j+2] = (unsigned char)((input[i] >> 16) & 0xff);
86 output[j+3] = (unsigned char)((input[i] >> 24) & 0xff);
87 }
88 }
89
90 /*
91 * Decodes input (unsigned char) into output (UINT4). Assumes len is
92 * a multiple of 4.
93 */
94 static void
Decode(UINT4 * output,const unsigned char * input,unsigned int len)95 Decode (UINT4 *output,
96 const unsigned char *input,
97 unsigned int len)
98 {
99 unsigned int i, j;
100
101 for (i = 0, j = 0; j < len; i++, j += 4)
102 output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) |
103 (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24);
104 }
105
106 static const unsigned char PADDING[64] = {
107 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
108 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0,
109 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0
110 };
111
112 /*
113 * F, G, H and I are basic MD5 functions.
114 */
115 #define F(x, y, z) (((x) & (y)) | ((~x) & (z)))
116 #define G(x, y, z) (((x) & (z)) | ((y) & (~z)))
117 #define H(x, y, z) ((x) ^ (y) ^ (z))
118 #define I(x, y, z) ((y) ^ ((x) | (~z)))
119
120 /*
121 * ROTATE_LEFT rotates x left n bits.
122 */
123 #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n))))
124
125 /*
126 * FF, GG, HH, and II transformations for rounds 1, 2, 3, and 4.
127 * Rotation is separate from addition to prevent recomputation.
128 */
129 #define FF(a, b, c, d, x, s, ac) { \
130 (a) += F ((b), (c), (d)) + (x) + (UINT4)(ac); \
131 (a) = ROTATE_LEFT ((a), (s)); \
132 (a) += (b); \
133 }
134
135 #define GG(a, b, c, d, x, s, ac) { \
136 (a) += G ((b), (c), (d)) + (x) + (UINT4)(ac); \
137 (a) = ROTATE_LEFT ((a), (s)); \
138 (a) += (b); \
139 }
140
141 #define HH(a, b, c, d, x, s, ac) { \
142 (a) += H ((b), (c), (d)) + (x) + (UINT4)(ac); \
143 (a) = ROTATE_LEFT ((a), (s)); \
144 (a) += (b); \
145 }
146
147 #define II(a, b, c, d, x, s, ac) { \
148 (a) += I ((b), (c), (d)) + (x) + (UINT4)(ac); \
149 (a) = ROTATE_LEFT ((a), (s)); \
150 (a) += (b); \
151 }
152
153 /*
154 * MD5 initialization. Begins an MD5 operation, writing a new context.
155 */
156 void
netpgpv_MD5Init(NETPGPV_MD5_CTX * context)157 netpgpv_MD5Init(NETPGPV_MD5_CTX *context)
158 {
159
160 context->count[0] = context->count[1] = 0;
161
162 /* Load magic initialization constants. */
163 context->state[0] = 0x67452301;
164 context->state[1] = 0xefcdab89;
165 context->state[2] = 0x98badcfe;
166 context->state[3] = 0x10325476;
167 }
168
169 /*
170 * MD5 block update operation. Continues an MD5 message-digest
171 * operation, processing another message block, and updating the
172 * context.
173 */
174 void
netpgpv_MD5Update(NETPGPV_MD5_CTX * context,const unsigned char * input,unsigned int inputLen)175 netpgpv_MD5Update(NETPGPV_MD5_CTX *context,
176 const unsigned char *input, /* input block */
177 unsigned int inputLen) /* length of input block */
178 {
179 unsigned int i, idx, partLen;
180
181 /* Compute number of bytes mod 64 */
182 idx = (unsigned int)((context->count[0] >> 3) & 0x3F);
183
184 /* Update number of bits */
185 if ((context->count[0] += ((UINT4)inputLen << 3))
186 < ((UINT4)inputLen << 3))
187 context->count[1]++;
188 context->count[1] += ((UINT4)inputLen >> 29);
189
190 partLen = 64 - idx;
191
192 /* Transform as many times as possible. */
193 if (inputLen >= partLen) {
194 memcpy((POINTER)&context->buffer[idx], input, partLen);
195 MD5Transform(context->state, context->buffer);
196
197 for (i = partLen; i + 63 < inputLen; i += 64)
198 MD5Transform(context->state, &input[i]);
199
200 idx = 0;
201 } else
202 i = 0;
203
204 /* Buffer remaining input */
205 memcpy(&context->buffer[idx], &input[i], inputLen - i);
206 }
207
208 /*
209 * MD5 finalization. Ends an MD5 message-digest operation, writing the
210 * message digest and zeroing the context.
211 */
212 void
netpgpv_MD5Final(unsigned char digest[16],NETPGPV_MD5_CTX * context)213 netpgpv_MD5Final(unsigned char digest[16], /* message digest */
214 NETPGPV_MD5_CTX *context) /* context */
215 {
216 unsigned char bits[8];
217 unsigned int idx, padLen;
218
219 /* Save number of bits */
220 Encode(bits, context->count, 8);
221
222 /* Pad out to 56 mod 64. */
223 idx = (unsigned int)((context->count[0] >> 3) & 0x3f);
224 padLen = (idx < 56) ? (56 - idx) : (120 - idx);
225 netpgpv_MD5Update (context, PADDING, padLen);
226
227 /* Append length (before padding) */
228 netpgpv_MD5Update(context, bits, 8);
229
230 /* Store state in digest */
231 Encode(digest, context->state, 16);
232
233 /* Zeroize sensitive information. */
234 ZEROIZE((POINTER)(void *)context, sizeof(*context));
235 }
236
237 /*
238 * MD5 basic transformation. Transforms state based on block.
239 */
240 static void
MD5Transform(UINT4 state[4],const unsigned char block[64])241 MD5Transform(UINT4 state[4], const unsigned char block[64])
242 {
243 UINT4 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 FF (a, b, c, d, x[ 0], S11, 0xd76aa478); /* 1 */
249 FF (d, a, b, c, x[ 1], S12, 0xe8c7b756); /* 2 */
250 FF (c, d, a, b, x[ 2], S13, 0x242070db); /* 3 */
251 FF (b, c, d, a, x[ 3], S14, 0xc1bdceee); /* 4 */
252 FF (a, b, c, d, x[ 4], S11, 0xf57c0faf); /* 5 */
253 FF (d, a, b, c, x[ 5], S12, 0x4787c62a); /* 6 */
254 FF (c, d, a, b, x[ 6], S13, 0xa8304613); /* 7 */
255 FF (b, c, d, a, x[ 7], S14, 0xfd469501); /* 8 */
256 FF (a, b, c, d, x[ 8], S11, 0x698098d8); /* 9 */
257 FF (d, a, b, c, x[ 9], S12, 0x8b44f7af); /* 10 */
258 FF (c, d, a, b, x[10], S13, 0xffff5bb1); /* 11 */
259 FF (b, c, d, a, x[11], S14, 0x895cd7be); /* 12 */
260 FF (a, b, c, d, x[12], S11, 0x6b901122); /* 13 */
261 FF (d, a, b, c, x[13], S12, 0xfd987193); /* 14 */
262 FF (c, d, a, b, x[14], S13, 0xa679438e); /* 15 */
263 FF (b, c, d, a, x[15], S14, 0x49b40821); /* 16 */
264
265 /* Round 2 */
266 GG (a, b, c, d, x[ 1], S21, 0xf61e2562); /* 17 */
267 GG (d, a, b, c, x[ 6], S22, 0xc040b340); /* 18 */
268 GG (c, d, a, b, x[11], S23, 0x265e5a51); /* 19 */
269 GG (b, c, d, a, x[ 0], S24, 0xe9b6c7aa); /* 20 */
270 GG (a, b, c, d, x[ 5], S21, 0xd62f105d); /* 21 */
271 GG (d, a, b, c, x[10], S22, 0x2441453); /* 22 */
272 GG (c, d, a, b, x[15], S23, 0xd8a1e681); /* 23 */
273 GG (b, c, d, a, x[ 4], S24, 0xe7d3fbc8); /* 24 */
274 GG (a, b, c, d, x[ 9], S21, 0x21e1cde6); /* 25 */
275 GG (d, a, b, c, x[14], S22, 0xc33707d6); /* 26 */
276 GG (c, d, a, b, x[ 3], S23, 0xf4d50d87); /* 27 */
277 GG (b, c, d, a, x[ 8], S24, 0x455a14ed); /* 28 */
278 GG (a, b, c, d, x[13], S21, 0xa9e3e905); /* 29 */
279 GG (d, a, b, c, x[ 2], S22, 0xfcefa3f8); /* 30 */
280 GG (c, d, a, b, x[ 7], S23, 0x676f02d9); /* 31 */
281 GG (b, c, d, a, x[12], S24, 0x8d2a4c8a); /* 32 */
282
283 /* Round 3 */
284 HH (a, b, c, d, x[ 5], S31, 0xfffa3942); /* 33 */
285 HH (d, a, b, c, x[ 8], S32, 0x8771f681); /* 34 */
286 HH (c, d, a, b, x[11], S33, 0x6d9d6122); /* 35 */
287 HH (b, c, d, a, x[14], S34, 0xfde5380c); /* 36 */
288 HH (a, b, c, d, x[ 1], S31, 0xa4beea44); /* 37 */
289 HH (d, a, b, c, x[ 4], S32, 0x4bdecfa9); /* 38 */
290 HH (c, d, a, b, x[ 7], S33, 0xf6bb4b60); /* 39 */
291 HH (b, c, d, a, x[10], S34, 0xbebfbc70); /* 40 */
292 HH (a, b, c, d, x[13], S31, 0x289b7ec6); /* 41 */
293 HH (d, a, b, c, x[ 0], S32, 0xeaa127fa); /* 42 */
294 HH (c, d, a, b, x[ 3], S33, 0xd4ef3085); /* 43 */
295 HH (b, c, d, a, x[ 6], S34, 0x4881d05); /* 44 */
296 HH (a, b, c, d, x[ 9], S31, 0xd9d4d039); /* 45 */
297 HH (d, a, b, c, x[12], S32, 0xe6db99e5); /* 46 */
298 HH (c, d, a, b, x[15], S33, 0x1fa27cf8); /* 47 */
299 HH (b, c, d, a, x[ 2], S34, 0xc4ac5665); /* 48 */
300
301 /* Round 4 */
302 II (a, b, c, d, x[ 0], S41, 0xf4292244); /* 49 */
303 II (d, a, b, c, x[ 7], S42, 0x432aff97); /* 50 */
304 II (c, d, a, b, x[14], S43, 0xab9423a7); /* 51 */
305 II (b, c, d, a, x[ 5], S44, 0xfc93a039); /* 52 */
306 II (a, b, c, d, x[12], S41, 0x655b59c3); /* 53 */
307 II (d, a, b, c, x[ 3], S42, 0x8f0ccc92); /* 54 */
308 II (c, d, a, b, x[10], S43, 0xffeff47d); /* 55 */
309 II (b, c, d, a, x[ 1], S44, 0x85845dd1); /* 56 */
310 II (a, b, c, d, x[ 8], S41, 0x6fa87e4f); /* 57 */
311 II (d, a, b, c, x[15], S42, 0xfe2ce6e0); /* 58 */
312 II (c, d, a, b, x[ 6], S43, 0xa3014314); /* 59 */
313 II (b, c, d, a, x[13], S44, 0x4e0811a1); /* 60 */
314 II (a, b, c, d, x[ 4], S41, 0xf7537e82); /* 61 */
315 II (d, a, b, c, x[11], S42, 0xbd3af235); /* 62 */
316 II (c, d, a, b, x[ 2], S43, 0x2ad7d2bb); /* 63 */
317 II (b, c, d, a, x[ 9], S44, 0xeb86d391); /* 64 */
318
319 state[0] += a;
320 state[1] += b;
321 state[2] += c;
322 state[3] += d;
323
324 /* Zeroize sensitive information. */
325 ZEROIZE((POINTER)(void *)x, sizeof (x));
326 }
327
328 #endif /* HAVE_MD5_H */
329