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Linux/crypto/rmd128.c

  1 /*
  2  * Cryptographic API.
  3  *
  4  * RIPEMD-128 - 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 rmd128_ctx {
 26         u64 byte_count;
 27         u32 state[4];
 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 rmd128_transform(u32 *state, const __le32 *in)
 51 {
 52         u32 aa, bb, cc, dd, aaa, bbb, ccc, ddd;
 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[0];
 62         bbb = state[1];
 63         ccc = state[2];
 64         ddd = state[3];
 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 2: left lane */
 85         ROUND(aa, bb, cc, dd, F2, K2, in[7],   7);
 86         ROUND(dd, aa, bb, cc, F2, K2, in[4],   6);
 87         ROUND(cc, dd, aa, bb, F2, K2, in[13],  8);
 88         ROUND(bb, cc, dd, aa, F2, K2, in[1],  13);
 89         ROUND(aa, bb, cc, dd, F2, K2, in[10], 11);
 90         ROUND(dd, aa, bb, cc, F2, K2, in[6],   9);
 91         ROUND(cc, dd, aa, bb, F2, K2, in[15],  7);
 92         ROUND(bb, cc, dd, aa, F2, K2, in[3],  15);
 93         ROUND(aa, bb, cc, dd, F2, K2, in[12],  7);
 94         ROUND(dd, aa, bb, cc, F2, K2, in[0],  12);
 95         ROUND(cc, dd, aa, bb, F2, K2, in[9],  15);
 96         ROUND(bb, cc, dd, aa, F2, K2, in[5],   9);
 97         ROUND(aa, bb, cc, dd, F2, K2, in[2],  11);
 98         ROUND(dd, aa, bb, cc, F2, K2, in[14],  7);
 99         ROUND(cc, dd, aa, bb, F2, K2, in[11], 13);
100         ROUND(bb, cc, dd, aa, F2, K2, in[8],  12);
101 
102         /* round 3: left lane */
103         ROUND(aa, bb, cc, dd, F3, K3, in[3],  11);
104         ROUND(dd, aa, bb, cc, F3, K3, in[10], 13);
105         ROUND(cc, dd, aa, bb, F3, K3, in[14],  6);
106         ROUND(bb, cc, dd, aa, F3, K3, in[4],   7);
107         ROUND(aa, bb, cc, dd, F3, K3, in[9],  14);
108         ROUND(dd, aa, bb, cc, F3, K3, in[15],  9);
109         ROUND(cc, dd, aa, bb, F3, K3, in[8],  13);
110         ROUND(bb, cc, dd, aa, F3, K3, in[1],  15);
111         ROUND(aa, bb, cc, dd, F3, K3, in[2],  14);
112         ROUND(dd, aa, bb, cc, F3, K3, in[7],   8);
113         ROUND(cc, dd, aa, bb, F3, K3, in[0],  13);
114         ROUND(bb, cc, dd, aa, F3, K3, in[6],   6);
115         ROUND(aa, bb, cc, dd, F3, K3, in[13],  5);
116         ROUND(dd, aa, bb, cc, F3, K3, in[11], 12);
117         ROUND(cc, dd, aa, bb, F3, K3, in[5],   7);
118         ROUND(bb, cc, dd, aa, F3, K3, in[12],  5);
119 
120         /* round 4: left lane */
121         ROUND(aa, bb, cc, dd, F4, K4, in[1],  11);
122         ROUND(dd, aa, bb, cc, F4, K4, in[9],  12);
123         ROUND(cc, dd, aa, bb, F4, K4, in[11], 14);
124         ROUND(bb, cc, dd, aa, F4, K4, in[10], 15);
125         ROUND(aa, bb, cc, dd, F4, K4, in[0],  14);
126         ROUND(dd, aa, bb, cc, F4, K4, in[8],  15);
127         ROUND(cc, dd, aa, bb, F4, K4, in[12],  9);
128         ROUND(bb, cc, dd, aa, F4, K4, in[4],   8);
129         ROUND(aa, bb, cc, dd, F4, K4, in[13],  9);
130         ROUND(dd, aa, bb, cc, F4, K4, in[3],  14);
131         ROUND(cc, dd, aa, bb, F4, K4, in[7],   5);
132         ROUND(bb, cc, dd, aa, F4, K4, in[15],  6);
133         ROUND(aa, bb, cc, dd, F4, K4, in[14],  8);
134         ROUND(dd, aa, bb, cc, F4, K4, in[5],   6);
135         ROUND(cc, dd, aa, bb, F4, K4, in[6],   5);
136         ROUND(bb, cc, dd, aa, F4, K4, in[2],  12);
137 
138         /* round 1: right lane */
139         ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[5],   8);
140         ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[14],  9);
141         ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[7],   9);
142         ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[0],  11);
143         ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[9],  13);
144         ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[2],  15);
145         ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[11], 15);
146         ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[4],   5);
147         ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[13],  7);
148         ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[6],   7);
149         ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[15],  8);
150         ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[8],  11);
151         ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[1],  14);
152         ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[10], 14);
153         ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[3],  12);
154         ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[12],  6);
155 
156         /* round 2: right lane */
157         ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[6],   9);
158         ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[11], 13);
159         ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[3],  15);
160         ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[7],   7);
161         ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[0],  12);
162         ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[13],  8);
163         ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[5],   9);
164         ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[10], 11);
165         ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[14],  7);
166         ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[15],  7);
167         ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[8],  12);
168         ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[12],  7);
169         ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[4],   6);
170         ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[9],  15);
171         ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[1],  13);
172         ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[2],  11);
173 
174         /* round 3: right lane */
175         ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[15],  9);
176         ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[5],   7);
177         ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[1],  15);
178         ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[3],  11);
179         ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[7],   8);
180         ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[14],  6);
181         ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[6],   6);
182         ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[9],  14);
183         ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[11], 12);
184         ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[8],  13);
185         ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[12],  5);
186         ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[2],  14);
187         ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[10], 13);
188         ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[0],  13);
189         ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[4],   7);
190         ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[13],  5);
191 
192         /* round 4: right lane */
193         ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[8],  15);
194         ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[6],   5);
195         ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[4],   8);
196         ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[1],  11);
197         ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[3],  14);
198         ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[11], 14);
199         ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[15],  6);
200         ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[0],  14);
201         ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[5],   6);
202         ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[12],  9);
203         ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[2],  12);
204         ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[13],  9);
205         ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[9],  12);
206         ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[7],   5);
207         ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[10], 15);
208         ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[14],  8);
209 
210         /* combine results */
211         ddd += cc + state[1];           /* final result for state[0] */
212         state[1] = state[2] + dd + aaa;
213         state[2] = state[3] + aa + bbb;
214         state[3] = state[0] + bb + ccc;
215         state[0] = ddd;
216 
217         return;
218 }
219 
220 static int rmd128_init(struct shash_desc *desc)
221 {
222         struct rmd128_ctx *rctx = shash_desc_ctx(desc);
223 
224         rctx->byte_count = 0;
225 
226         rctx->state[0] = RMD_H0;
227         rctx->state[1] = RMD_H1;
228         rctx->state[2] = RMD_H2;
229         rctx->state[3] = RMD_H3;
230 
231         memset(rctx->buffer, 0, sizeof(rctx->buffer));
232 
233         return 0;
234 }
235 
236 static int rmd128_update(struct shash_desc *desc, const u8 *data,
237                          unsigned int len)
238 {
239         struct rmd128_ctx *rctx = shash_desc_ctx(desc);
240         const u32 avail = sizeof(rctx->buffer) - (rctx->byte_count & 0x3f);
241 
242         rctx->byte_count += len;
243 
244         /* Enough space in buffer? If so copy and we're done */
245         if (avail > len) {
246                 memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
247                        data, len);
248                 goto out;
249         }
250 
251         memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
252                data, avail);
253 
254         rmd128_transform(rctx->state, rctx->buffer);
255         data += avail;
256         len -= avail;
257 
258         while (len >= sizeof(rctx->buffer)) {
259                 memcpy(rctx->buffer, data, sizeof(rctx->buffer));
260                 rmd128_transform(rctx->state, rctx->buffer);
261                 data += sizeof(rctx->buffer);
262                 len -= sizeof(rctx->buffer);
263         }
264 
265         memcpy(rctx->buffer, data, len);
266 
267 out:
268         return 0;
269 }
270 
271 /* Add padding and return the message digest. */
272 static int rmd128_final(struct shash_desc *desc, u8 *out)
273 {
274         struct rmd128_ctx *rctx = shash_desc_ctx(desc);
275         u32 i, index, padlen;
276         __le64 bits;
277         __le32 *dst = (__le32 *)out;
278         static const u8 padding[64] = { 0x80, };
279 
280         bits = cpu_to_le64(rctx->byte_count << 3);
281 
282         /* Pad out to 56 mod 64 */
283         index = rctx->byte_count & 0x3f;
284         padlen = (index < 56) ? (56 - index) : ((64+56) - index);
285         rmd128_update(desc, padding, padlen);
286 
287         /* Append length */
288         rmd128_update(desc, (const u8 *)&bits, sizeof(bits));
289 
290         /* Store state in digest */
291         for (i = 0; i < 4; i++)
292                 dst[i] = cpu_to_le32p(&rctx->state[i]);
293 
294         /* Wipe context */
295         memset(rctx, 0, sizeof(*rctx));
296 
297         return 0;
298 }
299 
300 static struct shash_alg alg = {
301         .digestsize     =       RMD128_DIGEST_SIZE,
302         .init           =       rmd128_init,
303         .update         =       rmd128_update,
304         .final          =       rmd128_final,
305         .descsize       =       sizeof(struct rmd128_ctx),
306         .base           =       {
307                 .cra_name        =      "rmd128",
308                 .cra_flags       =      CRYPTO_ALG_TYPE_SHASH,
309                 .cra_blocksize   =      RMD128_BLOCK_SIZE,
310                 .cra_module      =      THIS_MODULE,
311         }
312 };
313 
314 static int __init rmd128_mod_init(void)
315 {
316         return crypto_register_shash(&alg);
317 }
318 
319 static void __exit rmd128_mod_fini(void)
320 {
321         crypto_unregister_shash(&alg);
322 }
323 
324 module_init(rmd128_mod_init);
325 module_exit(rmd128_mod_fini);
326 
327 MODULE_LICENSE("GPL");
328 MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
329 MODULE_DESCRIPTION("RIPEMD-128 Message Digest");
330 MODULE_ALIAS_CRYPTO("rmd128");
331 

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