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Linux/crypto/rmd256.c

  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");
349 MODULE_ALIAS_CRYPTO("rmd256");
350 

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