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rmd256.c
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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 <[email protected]>
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 <[email protected]>");
348 MODULE_DESCRIPTION("RIPEMD-256 Message Digest");
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