1 | /* $NetBSD: md4c.c,v 1.5 2012/03/20 16:21:41 matt Exp $ */ |
2 | |
3 | /* |
4 | * This file is derived from the RSA Data Security, Inc. MD4 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) 1990-2, RSA Data Security, Inc. All rights reserved. |
11 | * |
12 | * License to copy and use this software is granted provided that it |
13 | * is identified as the "RSA Data Security, Inc. MD4 Message-Digest |
14 | * Algorithm" in all material mentioning or referencing this software |
15 | * or this function. |
16 | * |
17 | * License is also granted to make and use derivative works provided |
18 | * that such works are identified as "derived from the RSA Data |
19 | * Security, Inc. MD4 Message-Digest Algorithm" in all material |
20 | * mentioning or referencing the derived work. |
21 | * |
22 | * RSA Data Security, Inc. makes no representations concerning either |
23 | * the merchantability of this software or the suitability of this |
24 | * software for any particular purpose. It is provided "as is" |
25 | * without express or implied warranty of any kind. |
26 | * |
27 | * These notices must be retained in any copies of any part of this |
28 | * documentation and/or software. |
29 | */ |
30 | |
31 | #if !defined(_KERNEL) && !defined(_STANDALONE) |
32 | #include <sys/cdefs.h> |
33 | #if defined(LIBC_SCCS) && !defined(lint) |
34 | __RCSID("$NetBSD: md4c.c,v 1.5 2012/03/20 16:21:41 matt Exp $" ); |
35 | #endif /* LIBC_SCCS and not lint */ |
36 | |
37 | #include "namespace.h" |
38 | |
39 | #include <sys/types.h> |
40 | |
41 | #include <assert.h> |
42 | #include <md4.h> |
43 | #include <string.h> |
44 | |
45 | #if HAVE_NBTOOL_CONFIG_H |
46 | #include "nbtool_config.h" |
47 | #endif |
48 | |
49 | #else |
50 | |
51 | #include <sys/param.h> |
52 | #include <sys/md4.h> |
53 | #include <lib/libkern/libkern.h> |
54 | |
55 | #endif /* !_KERNEL && !_STANDALONE */ |
56 | |
57 | #if !HAVE_MD4_H |
58 | |
59 | typedef unsigned char *POINTER; |
60 | typedef uint16_t UINT2; |
61 | typedef uint32_t UINT4; |
62 | |
63 | /* |
64 | * Constants for MD4Transform routine. |
65 | */ |
66 | #define S11 3 |
67 | #define S12 7 |
68 | #define S13 11 |
69 | #define S14 19 |
70 | #define S21 3 |
71 | #define S22 5 |
72 | #define S23 9 |
73 | #define S24 13 |
74 | #define S31 3 |
75 | #define S32 9 |
76 | #define S33 11 |
77 | #define S34 15 |
78 | |
79 | static void MD4Transform(UINT4 [4], const unsigned char [64]); |
80 | |
81 | static void Encode(unsigned char *, UINT4 *, unsigned int); |
82 | static void Decode(UINT4 *, const unsigned char *, unsigned int); |
83 | |
84 | static const unsigned char PADDING[64] = { |
85 | 0x80, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
86 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, |
87 | 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0 |
88 | }; |
89 | |
90 | /* |
91 | * F, G and H are basic MD4 functions. |
92 | */ |
93 | #define F(x, y, z) (((x) & (y)) | ((~x) & (z))) |
94 | #define G(x, y, z) (((x) & (y)) | ((x) & (z)) | ((y) & (z))) |
95 | #define H(x, y, z) ((x) ^ (y) ^ (z)) |
96 | |
97 | /* |
98 | * ROTATE_LEFT rotates x left n bits. |
99 | */ |
100 | #define ROTATE_LEFT(x, n) (((x) << (n)) | ((x) >> (32-(n)))) |
101 | |
102 | /* |
103 | * FF, GG and HH are transformations for rounds 1, 2 and 3. |
104 | * Rotation is separate from addition to prevent recomputation. |
105 | */ |
106 | #define FF(a, b, c, d, x, s) { \ |
107 | (a) += F ((b), (c), (d)) + (x); \ |
108 | (a) = ROTATE_LEFT ((a), (s)); \ |
109 | } |
110 | |
111 | #define GG(a, b, c, d, x, s) { \ |
112 | (a) += G ((b), (c), (d)) + (x) + (UINT4)0x5a827999; \ |
113 | (a) = ROTATE_LEFT ((a), (s)); \ |
114 | } |
115 | |
116 | #define HH(a, b, c, d, x, s) { \ |
117 | (a) += H ((b), (c), (d)) + (x) + (UINT4)0x6ed9eba1; \ |
118 | (a) = ROTATE_LEFT ((a), (s)); \ |
119 | } |
120 | |
121 | #if !defined(_KERNEL) && !defined(_STANDALONE) && defined(__weak_alias) |
122 | __weak_alias(MD4Init,_MD4Init) |
123 | __weak_alias(MD4Update,_MD4Update) |
124 | __weak_alias(MD4Final,_MD4Final) |
125 | __weak_alias(MD4Transform,_MD4Transform) |
126 | #endif |
127 | |
128 | /* |
129 | * MD4 initialization. Begins an MD4 operation, writing a new context. |
130 | */ |
131 | void |
132 | MD4Init(MD4_CTX *context) /* context */ |
133 | { |
134 | |
135 | _DIAGASSERT(context != 0); |
136 | |
137 | context->count[0] = context->count[1] = 0; |
138 | |
139 | /* Load magic initialization constants. */ |
140 | context->state[0] = 0x67452301; |
141 | context->state[1] = 0xefcdab89; |
142 | context->state[2] = 0x98badcfe; |
143 | context->state[3] = 0x10325476; |
144 | } |
145 | |
146 | /* |
147 | * MD4 block update operation. Continues an MD4 message-digest |
148 | * operation, processing another message block, and updating the |
149 | * context. |
150 | */ |
151 | void |
152 | MD4Update (MD4_CTX *context, /* context */ |
153 | const unsigned char *input, /* input block */ |
154 | unsigned int inputLen) /* length of input block */ |
155 | { |
156 | unsigned int i, idx, partLen; |
157 | |
158 | _DIAGASSERT(context != 0); |
159 | _DIAGASSERT(input != 0); |
160 | |
161 | /* Compute number of bytes mod 64 */ |
162 | idx = (unsigned int)((context->count[0] >> 3) & 0x3F); |
163 | |
164 | /* Update number of bits */ |
165 | if ((context->count[0] += ((UINT4)inputLen << 3)) |
166 | < ((UINT4)inputLen << 3)) |
167 | context->count[1]++; |
168 | context->count[1] += ((UINT4)inputLen >> 29); |
169 | |
170 | partLen = 64 - idx; |
171 | |
172 | /* Transform as many times as possible. */ |
173 | if (inputLen >= partLen) { |
174 | memcpy(&context->buffer[idx], input, partLen); |
175 | MD4Transform(context->state, context->buffer); |
176 | |
177 | for (i = partLen; i + 63 < inputLen; i += 64) |
178 | MD4Transform(context->state, &input[i]); |
179 | |
180 | idx = 0; |
181 | } else |
182 | i = 0; |
183 | |
184 | /* Buffer remaining input */ |
185 | memcpy(&context->buffer[idx], &input[i], inputLen - i); |
186 | } |
187 | |
188 | /* |
189 | * MD4 finalization. Ends an MD4 message-digest operation, writing the |
190 | * message digest and zeroing the context. |
191 | */ |
192 | void |
193 | MD4Final (unsigned char digest[16], /* message digest */ |
194 | MD4_CTX *context) /* context */ |
195 | { |
196 | unsigned char bits[8]; |
197 | unsigned int idx, padLen; |
198 | |
199 | _DIAGASSERT(digest != 0); |
200 | _DIAGASSERT(context != 0); |
201 | |
202 | /* Save number of bits */ |
203 | Encode(bits, context->count, 8); |
204 | |
205 | /* Pad out to 56 mod 64. */ |
206 | idx = (unsigned int)((context->count[0] >> 3) & 0x3f); |
207 | padLen = (idx < 56) ? (56 - idx) : (120 - idx); |
208 | MD4Update(context, PADDING, padLen); |
209 | |
210 | /* Append length (before padding) */ |
211 | MD4Update(context, bits, 8); |
212 | |
213 | /* Store state in digest */ |
214 | Encode(digest, context->state, 16); |
215 | |
216 | /* Zeroize sensitive information. */ |
217 | memset(context, 0, sizeof(*context)); |
218 | } |
219 | |
220 | /* |
221 | * MD4 basic transformation. Transforms state based on block. |
222 | */ |
223 | static void |
224 | MD4Transform (UINT4 state[4], const unsigned char block[64]) |
225 | { |
226 | UINT4 a = state[0], b = state[1], c = state[2], d = state[3], x[16]; |
227 | |
228 | Decode(x, block, 64); |
229 | |
230 | /* Round 1 */ |
231 | FF (a, b, c, d, x[ 0], S11); /* 1 */ |
232 | FF (d, a, b, c, x[ 1], S12); /* 2 */ |
233 | FF (c, d, a, b, x[ 2], S13); /* 3 */ |
234 | FF (b, c, d, a, x[ 3], S14); /* 4 */ |
235 | FF (a, b, c, d, x[ 4], S11); /* 5 */ |
236 | FF (d, a, b, c, x[ 5], S12); /* 6 */ |
237 | FF (c, d, a, b, x[ 6], S13); /* 7 */ |
238 | FF (b, c, d, a, x[ 7], S14); /* 8 */ |
239 | FF (a, b, c, d, x[ 8], S11); /* 9 */ |
240 | FF (d, a, b, c, x[ 9], S12); /* 10 */ |
241 | FF (c, d, a, b, x[10], S13); /* 11 */ |
242 | FF (b, c, d, a, x[11], S14); /* 12 */ |
243 | FF (a, b, c, d, x[12], S11); /* 13 */ |
244 | FF (d, a, b, c, x[13], S12); /* 14 */ |
245 | FF (c, d, a, b, x[14], S13); /* 15 */ |
246 | FF (b, c, d, a, x[15], S14); /* 16 */ |
247 | |
248 | /* Round 2 */ |
249 | GG (a, b, c, d, x[ 0], S21); /* 17 */ |
250 | GG (d, a, b, c, x[ 4], S22); /* 18 */ |
251 | GG (c, d, a, b, x[ 8], S23); /* 19 */ |
252 | GG (b, c, d, a, x[12], S24); /* 20 */ |
253 | GG (a, b, c, d, x[ 1], S21); /* 21 */ |
254 | GG (d, a, b, c, x[ 5], S22); /* 22 */ |
255 | GG (c, d, a, b, x[ 9], S23); /* 23 */ |
256 | GG (b, c, d, a, x[13], S24); /* 24 */ |
257 | GG (a, b, c, d, x[ 2], S21); /* 25 */ |
258 | GG (d, a, b, c, x[ 6], S22); /* 26 */ |
259 | GG (c, d, a, b, x[10], S23); /* 27 */ |
260 | GG (b, c, d, a, x[14], S24); /* 28 */ |
261 | GG (a, b, c, d, x[ 3], S21); /* 29 */ |
262 | GG (d, a, b, c, x[ 7], S22); /* 30 */ |
263 | GG (c, d, a, b, x[11], S23); /* 31 */ |
264 | GG (b, c, d, a, x[15], S24); /* 32 */ |
265 | |
266 | /* Round 3 */ |
267 | HH (a, b, c, d, x[ 0], S31); /* 33 */ |
268 | HH (d, a, b, c, x[ 8], S32); /* 34 */ |
269 | HH (c, d, a, b, x[ 4], S33); /* 35 */ |
270 | HH (b, c, d, a, x[12], S34); /* 36 */ |
271 | HH (a, b, c, d, x[ 2], S31); /* 37 */ |
272 | HH (d, a, b, c, x[10], S32); /* 38 */ |
273 | HH (c, d, a, b, x[ 6], S33); /* 39 */ |
274 | HH (b, c, d, a, x[14], S34); /* 40 */ |
275 | HH (a, b, c, d, x[ 1], S31); /* 41 */ |
276 | HH (d, a, b, c, x[ 9], S32); /* 42 */ |
277 | HH (c, d, a, b, x[ 5], S33); /* 43 */ |
278 | HH (b, c, d, a, x[13], S34); /* 44 */ |
279 | HH (a, b, c, d, x[ 3], S31); /* 45 */ |
280 | HH (d, a, b, c, x[11], S32); /* 46 */ |
281 | HH (c, d, a, b, x[ 7], S33); /* 47 */ |
282 | HH (b, c, d, a, x[15], S34); /* 48 */ |
283 | |
284 | state[0] += a; |
285 | state[1] += b; |
286 | state[2] += c; |
287 | state[3] += d; |
288 | |
289 | /* Zeroize sensitive information. */ |
290 | memset(x, 0, sizeof (x)); |
291 | } |
292 | |
293 | /* |
294 | * Encodes input (UINT4) into output (unsigned char). Assumes len is |
295 | * a multiple of 4. |
296 | */ |
297 | static void |
298 | Encode(unsigned char *output, UINT4 *input, unsigned int len) |
299 | { |
300 | unsigned int i, j; |
301 | |
302 | for (i = 0, j = 0; j < len; i++, j += 4) { |
303 | output[j] = (unsigned char)(input[i] & 0xff); |
304 | output[j+1] = (unsigned char)((input[i] >> 8) & 0xff); |
305 | output[j+2] = (unsigned char)((input[i] >> 16) & 0xff); |
306 | output[j+3] = (unsigned char)((input[i] >> 24) & 0xff); |
307 | } |
308 | } |
309 | |
310 | /* |
311 | * Decodes input (unsigned char) into output (UINT4). Assumes len is |
312 | * a multiple of 4. |
313 | */ |
314 | static void |
315 | Decode(UINT4 *output, const unsigned char *input, unsigned int len) |
316 | { |
317 | unsigned int i, j; |
318 | |
319 | for (i = 0, j = 0; j < len; i++, j += 4) |
320 | output[i] = ((UINT4)input[j]) | (((UINT4)input[j+1]) << 8) | |
321 | (((UINT4)input[j+2]) << 16) | (((UINT4)input[j+3]) << 24); |
322 | } |
323 | |
324 | #endif /* HAVE_MD4_H */ |
325 | |