Root/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
25struct 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
50static 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
220static 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
236static 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
267out:
268    return 0;
269}
270
271/* Add padding and return the message digest. */
272static 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
300static 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
314static int __init rmd128_mod_init(void)
315{
316    return crypto_register_shash(&alg);
317}
318
319static void __exit rmd128_mod_fini(void)
320{
321    crypto_unregister_shash(&alg);
322}
323
324module_init(rmd128_mod_init);
325module_exit(rmd128_mod_fini);
326
327MODULE_LICENSE("GPL");
328MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
329MODULE_DESCRIPTION("RIPEMD-128 Message Digest");
330

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