Root/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
25struct 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
50static 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
235static 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
255static 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
286out:
287    return 0;
288}
289
290/* Add padding and return the message digest. */
291static 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
319static 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
333static int __init rmd256_mod_init(void)
334{
335    return crypto_register_shash(&alg);
336}
337
338static void __exit rmd256_mod_fini(void)
339{
340    crypto_unregister_shash(&alg);
341}
342
343module_init(rmd256_mod_init);
344module_exit(rmd256_mod_fini);
345
346MODULE_LICENSE("GPL");
347MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
348MODULE_DESCRIPTION("RIPEMD-256 Message Digest");
349

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