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1 | /* | |
2 | * Cryptographic API. | |
3 | * | |
4 | * RIPEMD-256 - RACE Integrity Primitives Evaluation Message Digest. | |
5 | * | |
6 | * Based on the reference implementation by Antoon Bosselaers, ESAT-COSIC | |
7 | * | |
8 | * Copyright (c) 2008 Adrian-Ken Rueegsegger <ken@codelabs.ch> | |
9 | * | |
10 | * This program is free software; you can redistribute it and/or modify it | |
11 | * under the terms of the GNU General Public License as published by the Free | |
12 | * Software Foundation; either version 2 of the License, or (at your option) | |
13 | * any later version. | |
14 | * | |
15 | */ | |
16 | #include <crypto/internal/hash.h> | |
17 | #include <linux/init.h> | |
18 | #include <linux/module.h> | |
19 | #include <linux/mm.h> | |
20 | #include <linux/types.h> | |
21 | #include <asm/byteorder.h> | |
22 | ||
23 | #include "ripemd.h" | |
24 | ||
25 | struct rmd256_ctx { | |
26 | u64 byte_count; | |
27 | u32 state[8]; | |
28 | __le32 buffer[16]; | |
29 | }; | |
30 | ||
31 | #define K1 RMD_K1 | |
32 | #define K2 RMD_K2 | |
33 | #define K3 RMD_K3 | |
34 | #define K4 RMD_K4 | |
35 | #define KK1 RMD_K6 | |
36 | #define KK2 RMD_K7 | |
37 | #define KK3 RMD_K8 | |
38 | #define KK4 RMD_K1 | |
39 | ||
40 | #define F1(x, y, z) (x ^ y ^ z) /* XOR */ | |
41 | #define F2(x, y, z) (z ^ (x & (y ^ z))) /* x ? y : z */ | |
42 | #define F3(x, y, z) ((x | ~y) ^ z) | |
43 | #define F4(x, y, z) (y ^ (z & (x ^ y))) /* z ? x : y */ | |
44 | ||
45 | #define ROUND(a, b, c, d, f, k, x, s) { \ | |
46 | (a) += f((b), (c), (d)) + le32_to_cpup(&(x)) + (k); \ | |
47 | (a) = rol32((a), (s)); \ | |
48 | } | |
49 | ||
50 | static void rmd256_transform(u32 *state, const __le32 *in) | |
51 | { | |
52 | u32 aa, bb, cc, dd, aaa, bbb, ccc, ddd, tmp; | |
53 | ||
54 | /* Initialize left lane */ | |
55 | aa = state[0]; | |
56 | bb = state[1]; | |
57 | cc = state[2]; | |
58 | dd = state[3]; | |
59 | ||
60 | /* Initialize right lane */ | |
61 | aaa = state[4]; | |
62 | bbb = state[5]; | |
63 | ccc = state[6]; | |
64 | ddd = state[7]; | |
65 | ||
66 | /* round 1: left lane */ | |
67 | ROUND(aa, bb, cc, dd, F1, K1, in[0], 11); | |
68 | ROUND(dd, aa, bb, cc, F1, K1, in[1], 14); | |
69 | ROUND(cc, dd, aa, bb, F1, K1, in[2], 15); | |
70 | ROUND(bb, cc, dd, aa, F1, K1, in[3], 12); | |
71 | ROUND(aa, bb, cc, dd, F1, K1, in[4], 5); | |
72 | ROUND(dd, aa, bb, cc, F1, K1, in[5], 8); | |
73 | ROUND(cc, dd, aa, bb, F1, K1, in[6], 7); | |
74 | ROUND(bb, cc, dd, aa, F1, K1, in[7], 9); | |
75 | ROUND(aa, bb, cc, dd, F1, K1, in[8], 11); | |
76 | ROUND(dd, aa, bb, cc, F1, K1, in[9], 13); | |
77 | ROUND(cc, dd, aa, bb, F1, K1, in[10], 14); | |
78 | ROUND(bb, cc, dd, aa, F1, K1, in[11], 15); | |
79 | ROUND(aa, bb, cc, dd, F1, K1, in[12], 6); | |
80 | ROUND(dd, aa, bb, cc, F1, K1, in[13], 7); | |
81 | ROUND(cc, dd, aa, bb, F1, K1, in[14], 9); | |
82 | ROUND(bb, cc, dd, aa, F1, K1, in[15], 8); | |
83 | ||
84 | /* round 1: right lane */ | |
85 | ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[5], 8); | |
86 | ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[14], 9); | |
87 | ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[7], 9); | |
88 | ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[0], 11); | |
89 | ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[9], 13); | |
90 | ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[2], 15); | |
91 | ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[11], 15); | |
92 | ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[4], 5); | |
93 | ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[13], 7); | |
94 | ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[6], 7); | |
95 | ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[15], 8); | |
96 | ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[8], 11); | |
97 | ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[1], 14); | |
98 | ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[10], 14); | |
99 | ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[3], 12); | |
100 | ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[12], 6); | |
101 | ||
102 | /* Swap contents of "a" registers */ | |
103 | tmp = aa; aa = aaa; aaa = tmp; | |
104 | ||
105 | /* round 2: left lane */ | |
106 | ROUND(aa, bb, cc, dd, F2, K2, in[7], 7); | |
107 | ROUND(dd, aa, bb, cc, F2, K2, in[4], 6); | |
108 | ROUND(cc, dd, aa, bb, F2, K2, in[13], 8); | |
109 | ROUND(bb, cc, dd, aa, F2, K2, in[1], 13); | |
110 | ROUND(aa, bb, cc, dd, F2, K2, in[10], 11); | |
111 | ROUND(dd, aa, bb, cc, F2, K2, in[6], 9); | |
112 | ROUND(cc, dd, aa, bb, F2, K2, in[15], 7); | |
113 | ROUND(bb, cc, dd, aa, F2, K2, in[3], 15); | |
114 | ROUND(aa, bb, cc, dd, F2, K2, in[12], 7); | |
115 | ROUND(dd, aa, bb, cc, F2, K2, in[0], 12); | |
116 | ROUND(cc, dd, aa, bb, F2, K2, in[9], 15); | |
117 | ROUND(bb, cc, dd, aa, F2, K2, in[5], 9); | |
118 | ROUND(aa, bb, cc, dd, F2, K2, in[2], 11); | |
119 | ROUND(dd, aa, bb, cc, F2, K2, in[14], 7); | |
120 | ROUND(cc, dd, aa, bb, F2, K2, in[11], 13); | |
121 | ROUND(bb, cc, dd, aa, F2, K2, in[8], 12); | |
122 | ||
123 | /* round 2: right lane */ | |
124 | ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[6], 9); | |
125 | ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[11], 13); | |
126 | ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[3], 15); | |
127 | ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[7], 7); | |
128 | ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[0], 12); | |
129 | ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[13], 8); | |
130 | ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[5], 9); | |
131 | ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[10], 11); | |
132 | ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[14], 7); | |
133 | ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[15], 7); | |
134 | ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[8], 12); | |
135 | ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[12], 7); | |
136 | ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[4], 6); | |
137 | ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[9], 15); | |
138 | ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[1], 13); | |
139 | ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[2], 11); | |
140 | ||
141 | /* Swap contents of "b" registers */ | |
142 | tmp = bb; bb = bbb; bbb = tmp; | |
143 | ||
144 | /* round 3: left lane */ | |
145 | ROUND(aa, bb, cc, dd, F3, K3, in[3], 11); | |
146 | ROUND(dd, aa, bb, cc, F3, K3, in[10], 13); | |
147 | ROUND(cc, dd, aa, bb, F3, K3, in[14], 6); | |
148 | ROUND(bb, cc, dd, aa, F3, K3, in[4], 7); | |
149 | ROUND(aa, bb, cc, dd, F3, K3, in[9], 14); | |
150 | ROUND(dd, aa, bb, cc, F3, K3, in[15], 9); | |
151 | ROUND(cc, dd, aa, bb, F3, K3, in[8], 13); | |
152 | ROUND(bb, cc, dd, aa, F3, K3, in[1], 15); | |
153 | ROUND(aa, bb, cc, dd, F3, K3, in[2], 14); | |
154 | ROUND(dd, aa, bb, cc, F3, K3, in[7], 8); | |
155 | ROUND(cc, dd, aa, bb, F3, K3, in[0], 13); | |
156 | ROUND(bb, cc, dd, aa, F3, K3, in[6], 6); | |
157 | ROUND(aa, bb, cc, dd, F3, K3, in[13], 5); | |
158 | ROUND(dd, aa, bb, cc, F3, K3, in[11], 12); | |
159 | ROUND(cc, dd, aa, bb, F3, K3, in[5], 7); | |
160 | ROUND(bb, cc, dd, aa, F3, K3, in[12], 5); | |
161 | ||
162 | /* round 3: right lane */ | |
163 | ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[15], 9); | |
164 | ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[5], 7); | |
165 | ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[1], 15); | |
166 | ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[3], 11); | |
167 | ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[7], 8); | |
168 | ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[14], 6); | |
169 | ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[6], 6); | |
170 | ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[9], 14); | |
171 | ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[11], 12); | |
172 | ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[8], 13); | |
173 | ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[12], 5); | |
174 | ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[2], 14); | |
175 | ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[10], 13); | |
176 | ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[0], 13); | |
177 | ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[4], 7); | |
178 | ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[13], 5); | |
179 | ||
180 | /* Swap contents of "c" registers */ | |
181 | tmp = cc; cc = ccc; ccc = tmp; | |
182 | ||
183 | /* round 4: left lane */ | |
184 | ROUND(aa, bb, cc, dd, F4, K4, in[1], 11); | |
185 | ROUND(dd, aa, bb, cc, F4, K4, in[9], 12); | |
186 | ROUND(cc, dd, aa, bb, F4, K4, in[11], 14); | |
187 | ROUND(bb, cc, dd, aa, F4, K4, in[10], 15); | |
188 | ROUND(aa, bb, cc, dd, F4, K4, in[0], 14); | |
189 | ROUND(dd, aa, bb, cc, F4, K4, in[8], 15); | |
190 | ROUND(cc, dd, aa, bb, F4, K4, in[12], 9); | |
191 | ROUND(bb, cc, dd, aa, F4, K4, in[4], 8); | |
192 | ROUND(aa, bb, cc, dd, F4, K4, in[13], 9); | |
193 | ROUND(dd, aa, bb, cc, F4, K4, in[3], 14); | |
194 | ROUND(cc, dd, aa, bb, F4, K4, in[7], 5); | |
195 | ROUND(bb, cc, dd, aa, F4, K4, in[15], 6); | |
196 | ROUND(aa, bb, cc, dd, F4, K4, in[14], 8); | |
197 | ROUND(dd, aa, bb, cc, F4, K4, in[5], 6); | |
198 | ROUND(cc, dd, aa, bb, F4, K4, in[6], 5); | |
199 | ROUND(bb, cc, dd, aa, F4, K4, in[2], 12); | |
200 | ||
201 | /* round 4: right lane */ | |
202 | ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[8], 15); | |
203 | ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[6], 5); | |
204 | ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[4], 8); | |
205 | ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[1], 11); | |
206 | ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[3], 14); | |
207 | ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[11], 14); | |
208 | ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[15], 6); | |
209 | ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[0], 14); | |
210 | ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[5], 6); | |
211 | ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[12], 9); | |
212 | ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[2], 12); | |
213 | ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[13], 9); | |
214 | ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[9], 12); | |
215 | ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[7], 5); | |
216 | ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[10], 15); | |
217 | ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[14], 8); | |
218 | ||
219 | /* Swap contents of "d" registers */ | |
220 | tmp = dd; dd = ddd; ddd = tmp; | |
221 | ||
222 | /* combine results */ | |
223 | state[0] += aa; | |
224 | state[1] += bb; | |
225 | state[2] += cc; | |
226 | state[3] += dd; | |
227 | state[4] += aaa; | |
228 | state[5] += bbb; | |
229 | state[6] += ccc; | |
230 | state[7] += ddd; | |
231 | ||
232 | return; | |
233 | } | |
234 | ||
235 | static int rmd256_init(struct shash_desc *desc) | |
236 | { | |
237 | struct rmd256_ctx *rctx = shash_desc_ctx(desc); | |
238 | ||
239 | rctx->byte_count = 0; | |
240 | ||
241 | rctx->state[0] = RMD_H0; | |
242 | rctx->state[1] = RMD_H1; | |
243 | rctx->state[2] = RMD_H2; | |
244 | rctx->state[3] = RMD_H3; | |
245 | rctx->state[4] = RMD_H5; | |
246 | rctx->state[5] = RMD_H6; | |
247 | rctx->state[6] = RMD_H7; | |
248 | rctx->state[7] = RMD_H8; | |
249 | ||
250 | memset(rctx->buffer, 0, sizeof(rctx->buffer)); | |
251 | ||
252 | return 0; | |
253 | } | |
254 | ||
255 | static int rmd256_update(struct shash_desc *desc, const u8 *data, | |
256 | unsigned int len) | |
257 | { | |
258 | struct rmd256_ctx *rctx = shash_desc_ctx(desc); | |
259 | const u32 avail = sizeof(rctx->buffer) - (rctx->byte_count & 0x3f); | |
260 | ||
261 | rctx->byte_count += len; | |
262 | ||
263 | /* Enough space in buffer? If so copy and we're done */ | |
264 | if (avail > len) { | |
265 | memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail), | |
266 | data, len); | |
267 | goto out; | |
268 | } | |
269 | ||
270 | memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail), | |
271 | data, avail); | |
272 | ||
273 | rmd256_transform(rctx->state, rctx->buffer); | |
274 | data += avail; | |
275 | len -= avail; | |
276 | ||
277 | while (len >= sizeof(rctx->buffer)) { | |
278 | memcpy(rctx->buffer, data, sizeof(rctx->buffer)); | |
279 | rmd256_transform(rctx->state, rctx->buffer); | |
280 | data += sizeof(rctx->buffer); | |
281 | len -= sizeof(rctx->buffer); | |
282 | } | |
283 | ||
284 | memcpy(rctx->buffer, data, len); | |
285 | ||
286 | out: | |
287 | return 0; | |
288 | } | |
289 | ||
290 | /* Add padding and return the message digest. */ | |
291 | static int rmd256_final(struct shash_desc *desc, u8 *out) | |
292 | { | |
293 | struct rmd256_ctx *rctx = shash_desc_ctx(desc); | |
294 | u32 i, index, padlen; | |
295 | __le64 bits; | |
296 | __le32 *dst = (__le32 *)out; | |
297 | static const u8 padding[64] = { 0x80, }; | |
298 | ||
299 | bits = cpu_to_le64(rctx->byte_count << 3); | |
300 | ||
301 | /* Pad out to 56 mod 64 */ | |
302 | index = rctx->byte_count & 0x3f; | |
303 | padlen = (index < 56) ? (56 - index) : ((64+56) - index); | |
304 | rmd256_update(desc, padding, padlen); | |
305 | ||
306 | /* Append length */ | |
307 | rmd256_update(desc, (const u8 *)&bits, sizeof(bits)); | |
308 | ||
309 | /* Store state in digest */ | |
310 | for (i = 0; i < 8; i++) | |
311 | dst[i] = cpu_to_le32p(&rctx->state[i]); | |
312 | ||
313 | /* Wipe context */ | |
314 | memset(rctx, 0, sizeof(*rctx)); | |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | static struct shash_alg alg = { | |
320 | .digestsize = RMD256_DIGEST_SIZE, | |
321 | .init = rmd256_init, | |
322 | .update = rmd256_update, | |
323 | .final = rmd256_final, | |
324 | .descsize = sizeof(struct rmd256_ctx), | |
325 | .base = { | |
326 | .cra_name = "rmd256", | |
327 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
328 | .cra_blocksize = RMD256_BLOCK_SIZE, | |
329 | .cra_module = THIS_MODULE, | |
330 | } | |
331 | }; | |
332 | ||
333 | static int __init rmd256_mod_init(void) | |
334 | { | |
335 | return crypto_register_shash(&alg); | |
336 | } | |
337 | ||
338 | static void __exit rmd256_mod_fini(void) | |
339 | { | |
340 | crypto_unregister_shash(&alg); | |
341 | } | |
342 | ||
343 | module_init(rmd256_mod_init); | |
344 | module_exit(rmd256_mod_fini); | |
345 | ||
346 | MODULE_LICENSE("GPL"); | |
347 | MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>"); | |
348 | MODULE_DESCRIPTION("RIPEMD-256 Message Digest"); |