1/*
2 * Cryptographic API.
3 *
4 * RIPEMD-320 - 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 rmd320_ctx {
26	u64 byte_count;
27	u32 state[10];
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 K5  RMD_K5
36#define KK1 RMD_K6
37#define KK2 RMD_K7
38#define KK3 RMD_K8
39#define KK4 RMD_K9
40#define KK5 RMD_K1
41
42#define F1(x, y, z) (x ^ y ^ z)		/* XOR */
43#define F2(x, y, z) (z ^ (x & (y ^ z)))	/* x ? y : z */
44#define F3(x, y, z) ((x | ~y) ^ z)
45#define F4(x, y, z) (y ^ (z & (x ^ y)))	/* z ? x : y */
46#define F5(x, y, z) (x ^ (y | ~z))
47
48#define ROUND(a, b, c, d, e, f, k, x, s)  { \
49	(a) += f((b), (c), (d)) + le32_to_cpup(&(x)) + (k); \
50	(a) = rol32((a), (s)) + (e); \
51	(c) = rol32((c), 10); \
52}
53
54static void rmd320_transform(u32 *state, const __le32 *in)
55{
56	u32 aa, bb, cc, dd, ee, aaa, bbb, ccc, ddd, eee, tmp;
57
58	/* Initialize left lane */
59	aa = state[0];
60	bb = state[1];
61	cc = state[2];
62	dd = state[3];
63	ee = state[4];
64
65	/* Initialize right lane */
66	aaa = state[5];
67	bbb = state[6];
68	ccc = state[7];
69	ddd = state[8];
70	eee = state[9];
71
72	/* round 1: left lane */
73	ROUND(aa, bb, cc, dd, ee, F1, K1, in[0],  11);
74	ROUND(ee, aa, bb, cc, dd, F1, K1, in[1],  14);
75	ROUND(dd, ee, aa, bb, cc, F1, K1, in[2],  15);
76	ROUND(cc, dd, ee, aa, bb, F1, K1, in[3],  12);
77	ROUND(bb, cc, dd, ee, aa, F1, K1, in[4],   5);
78	ROUND(aa, bb, cc, dd, ee, F1, K1, in[5],   8);
79	ROUND(ee, aa, bb, cc, dd, F1, K1, in[6],   7);
80	ROUND(dd, ee, aa, bb, cc, F1, K1, in[7],   9);
81	ROUND(cc, dd, ee, aa, bb, F1, K1, in[8],  11);
82	ROUND(bb, cc, dd, ee, aa, F1, K1, in[9],  13);
83	ROUND(aa, bb, cc, dd, ee, F1, K1, in[10], 14);
84	ROUND(ee, aa, bb, cc, dd, F1, K1, in[11], 15);
85	ROUND(dd, ee, aa, bb, cc, F1, K1, in[12],  6);
86	ROUND(cc, dd, ee, aa, bb, F1, K1, in[13],  7);
87	ROUND(bb, cc, dd, ee, aa, F1, K1, in[14],  9);
88	ROUND(aa, bb, cc, dd, ee, F1, K1, in[15],  8);
89
90	/* round 1: right lane */
91	ROUND(aaa, bbb, ccc, ddd, eee, F5, KK1, in[5],   8);
92	ROUND(eee, aaa, bbb, ccc, ddd, F5, KK1, in[14],  9);
93	ROUND(ddd, eee, aaa, bbb, ccc, F5, KK1, in[7],   9);
94	ROUND(ccc, ddd, eee, aaa, bbb, F5, KK1, in[0],  11);
95	ROUND(bbb, ccc, ddd, eee, aaa, F5, KK1, in[9],  13);
96	ROUND(aaa, bbb, ccc, ddd, eee, F5, KK1, in[2],  15);
97	ROUND(eee, aaa, bbb, ccc, ddd, F5, KK1, in[11], 15);
98	ROUND(ddd, eee, aaa, bbb, ccc, F5, KK1, in[4],   5);
99	ROUND(ccc, ddd, eee, aaa, bbb, F5, KK1, in[13],  7);
100	ROUND(bbb, ccc, ddd, eee, aaa, F5, KK1, in[6],   7);
101	ROUND(aaa, bbb, ccc, ddd, eee, F5, KK1, in[15],  8);
102	ROUND(eee, aaa, bbb, ccc, ddd, F5, KK1, in[8],  11);
103	ROUND(ddd, eee, aaa, bbb, ccc, F5, KK1, in[1],  14);
104	ROUND(ccc, ddd, eee, aaa, bbb, F5, KK1, in[10], 14);
105	ROUND(bbb, ccc, ddd, eee, aaa, F5, KK1, in[3],  12);
106	ROUND(aaa, bbb, ccc, ddd, eee, F5, KK1, in[12],  6);
107
108	/* Swap contents of "a" registers */
109	tmp = aa; aa = aaa; aaa = tmp;
110
111	/* round 2: left lane" */
112	ROUND(ee, aa, bb, cc, dd, F2, K2, in[7],   7);
113	ROUND(dd, ee, aa, bb, cc, F2, K2, in[4],   6);
114	ROUND(cc, dd, ee, aa, bb, F2, K2, in[13],  8);
115	ROUND(bb, cc, dd, ee, aa, F2, K2, in[1],  13);
116	ROUND(aa, bb, cc, dd, ee, F2, K2, in[10], 11);
117	ROUND(ee, aa, bb, cc, dd, F2, K2, in[6],   9);
118	ROUND(dd, ee, aa, bb, cc, F2, K2, in[15],  7);
119	ROUND(cc, dd, ee, aa, bb, F2, K2, in[3],  15);
120	ROUND(bb, cc, dd, ee, aa, F2, K2, in[12],  7);
121	ROUND(aa, bb, cc, dd, ee, F2, K2, in[0],  12);
122	ROUND(ee, aa, bb, cc, dd, F2, K2, in[9],  15);
123	ROUND(dd, ee, aa, bb, cc, F2, K2, in[5],   9);
124	ROUND(cc, dd, ee, aa, bb, F2, K2, in[2],  11);
125	ROUND(bb, cc, dd, ee, aa, F2, K2, in[14],  7);
126	ROUND(aa, bb, cc, dd, ee, F2, K2, in[11], 13);
127	ROUND(ee, aa, bb, cc, dd, F2, K2, in[8],  12);
128
129	/* round 2: right lane */
130	ROUND(eee, aaa, bbb, ccc, ddd, F4, KK2, in[6],   9);
131	ROUND(ddd, eee, aaa, bbb, ccc, F4, KK2, in[11], 13);
132	ROUND(ccc, ddd, eee, aaa, bbb, F4, KK2, in[3],  15);
133	ROUND(bbb, ccc, ddd, eee, aaa, F4, KK2, in[7],   7);
134	ROUND(aaa, bbb, ccc, ddd, eee, F4, KK2, in[0],  12);
135	ROUND(eee, aaa, bbb, ccc, ddd, F4, KK2, in[13],  8);
136	ROUND(ddd, eee, aaa, bbb, ccc, F4, KK2, in[5],   9);
137	ROUND(ccc, ddd, eee, aaa, bbb, F4, KK2, in[10], 11);
138	ROUND(bbb, ccc, ddd, eee, aaa, F4, KK2, in[14],  7);
139	ROUND(aaa, bbb, ccc, ddd, eee, F4, KK2, in[15],  7);
140	ROUND(eee, aaa, bbb, ccc, ddd, F4, KK2, in[8],  12);
141	ROUND(ddd, eee, aaa, bbb, ccc, F4, KK2, in[12],  7);
142	ROUND(ccc, ddd, eee, aaa, bbb, F4, KK2, in[4],   6);
143	ROUND(bbb, ccc, ddd, eee, aaa, F4, KK2, in[9],  15);
144	ROUND(aaa, bbb, ccc, ddd, eee, F4, KK2, in[1],  13);
145	ROUND(eee, aaa, bbb, ccc, ddd, F4, KK2, in[2],  11);
146
147	/* Swap contents of "b" registers */
148	tmp = bb; bb = bbb; bbb = tmp;
149
150	/* round 3: left lane" */
151	ROUND(dd, ee, aa, bb, cc, F3, K3, in[3],  11);
152	ROUND(cc, dd, ee, aa, bb, F3, K3, in[10], 13);
153	ROUND(bb, cc, dd, ee, aa, F3, K3, in[14],  6);
154	ROUND(aa, bb, cc, dd, ee, F3, K3, in[4],   7);
155	ROUND(ee, aa, bb, cc, dd, F3, K3, in[9],  14);
156	ROUND(dd, ee, aa, bb, cc, F3, K3, in[15],  9);
157	ROUND(cc, dd, ee, aa, bb, F3, K3, in[8],  13);
158	ROUND(bb, cc, dd, ee, aa, F3, K3, in[1],  15);
159	ROUND(aa, bb, cc, dd, ee, F3, K3, in[2],  14);
160	ROUND(ee, aa, bb, cc, dd, F3, K3, in[7],   8);
161	ROUND(dd, ee, aa, bb, cc, F3, K3, in[0],  13);
162	ROUND(cc, dd, ee, aa, bb, F3, K3, in[6],   6);
163	ROUND(bb, cc, dd, ee, aa, F3, K3, in[13],  5);
164	ROUND(aa, bb, cc, dd, ee, F3, K3, in[11], 12);
165	ROUND(ee, aa, bb, cc, dd, F3, K3, in[5],   7);
166	ROUND(dd, ee, aa, bb, cc, F3, K3, in[12],  5);
167
168	/* round 3: right lane */
169	ROUND(ddd, eee, aaa, bbb, ccc, F3, KK3, in[15],  9);
170	ROUND(ccc, ddd, eee, aaa, bbb, F3, KK3, in[5],   7);
171	ROUND(bbb, ccc, ddd, eee, aaa, F3, KK3, in[1],  15);
172	ROUND(aaa, bbb, ccc, ddd, eee, F3, KK3, in[3],  11);
173	ROUND(eee, aaa, bbb, ccc, ddd, F3, KK3, in[7],   8);
174	ROUND(ddd, eee, aaa, bbb, ccc, F3, KK3, in[14],  6);
175	ROUND(ccc, ddd, eee, aaa, bbb, F3, KK3, in[6],   6);
176	ROUND(bbb, ccc, ddd, eee, aaa, F3, KK3, in[9],  14);
177	ROUND(aaa, bbb, ccc, ddd, eee, F3, KK3, in[11], 12);
178	ROUND(eee, aaa, bbb, ccc, ddd, F3, KK3, in[8],  13);
179	ROUND(ddd, eee, aaa, bbb, ccc, F3, KK3, in[12],  5);
180	ROUND(ccc, ddd, eee, aaa, bbb, F3, KK3, in[2],  14);
181	ROUND(bbb, ccc, ddd, eee, aaa, F3, KK3, in[10], 13);
182	ROUND(aaa, bbb, ccc, ddd, eee, F3, KK3, in[0],  13);
183	ROUND(eee, aaa, bbb, ccc, ddd, F3, KK3, in[4],   7);
184	ROUND(ddd, eee, aaa, bbb, ccc, F3, KK3, in[13],  5);
185
186	/* Swap contents of "c" registers */
187	tmp = cc; cc = ccc; ccc = tmp;
188
189	/* round 4: left lane" */
190	ROUND(cc, dd, ee, aa, bb, F4, K4, in[1],  11);
191	ROUND(bb, cc, dd, ee, aa, F4, K4, in[9],  12);
192	ROUND(aa, bb, cc, dd, ee, F4, K4, in[11], 14);
193	ROUND(ee, aa, bb, cc, dd, F4, K4, in[10], 15);
194	ROUND(dd, ee, aa, bb, cc, F4, K4, in[0],  14);
195	ROUND(cc, dd, ee, aa, bb, F4, K4, in[8],  15);
196	ROUND(bb, cc, dd, ee, aa, F4, K4, in[12],  9);
197	ROUND(aa, bb, cc, dd, ee, F4, K4, in[4],   8);
198	ROUND(ee, aa, bb, cc, dd, F4, K4, in[13],  9);
199	ROUND(dd, ee, aa, bb, cc, F4, K4, in[3],  14);
200	ROUND(cc, dd, ee, aa, bb, F4, K4, in[7],   5);
201	ROUND(bb, cc, dd, ee, aa, F4, K4, in[15],  6);
202	ROUND(aa, bb, cc, dd, ee, F4, K4, in[14],  8);
203	ROUND(ee, aa, bb, cc, dd, F4, K4, in[5],   6);
204	ROUND(dd, ee, aa, bb, cc, F4, K4, in[6],   5);
205	ROUND(cc, dd, ee, aa, bb, F4, K4, in[2],  12);
206
207	/* round 4: right lane */
208	ROUND(ccc, ddd, eee, aaa, bbb, F2, KK4, in[8],  15);
209	ROUND(bbb, ccc, ddd, eee, aaa, F2, KK4, in[6],   5);
210	ROUND(aaa, bbb, ccc, ddd, eee, F2, KK4, in[4],   8);
211	ROUND(eee, aaa, bbb, ccc, ddd, F2, KK4, in[1],  11);
212	ROUND(ddd, eee, aaa, bbb, ccc, F2, KK4, in[3],  14);
213	ROUND(ccc, ddd, eee, aaa, bbb, F2, KK4, in[11], 14);
214	ROUND(bbb, ccc, ddd, eee, aaa, F2, KK4, in[15],  6);
215	ROUND(aaa, bbb, ccc, ddd, eee, F2, KK4, in[0],  14);
216	ROUND(eee, aaa, bbb, ccc, ddd, F2, KK4, in[5],   6);
217	ROUND(ddd, eee, aaa, bbb, ccc, F2, KK4, in[12],  9);
218	ROUND(ccc, ddd, eee, aaa, bbb, F2, KK4, in[2],  12);
219	ROUND(bbb, ccc, ddd, eee, aaa, F2, KK4, in[13],  9);
220	ROUND(aaa, bbb, ccc, ddd, eee, F2, KK4, in[9],  12);
221	ROUND(eee, aaa, bbb, ccc, ddd, F2, KK4, in[7],   5);
222	ROUND(ddd, eee, aaa, bbb, ccc, F2, KK4, in[10], 15);
223	ROUND(ccc, ddd, eee, aaa, bbb, F2, KK4, in[14],  8);
224
225	/* Swap contents of "d" registers */
226	tmp = dd; dd = ddd; ddd = tmp;
227
228	/* round 5: left lane" */
229	ROUND(bb, cc, dd, ee, aa, F5, K5, in[4],   9);
230	ROUND(aa, bb, cc, dd, ee, F5, K5, in[0],  15);
231	ROUND(ee, aa, bb, cc, dd, F5, K5, in[5],   5);
232	ROUND(dd, ee, aa, bb, cc, F5, K5, in[9],  11);
233	ROUND(cc, dd, ee, aa, bb, F5, K5, in[7],   6);
234	ROUND(bb, cc, dd, ee, aa, F5, K5, in[12],  8);
235	ROUND(aa, bb, cc, dd, ee, F5, K5, in[2],  13);
236	ROUND(ee, aa, bb, cc, dd, F5, K5, in[10], 12);
237	ROUND(dd, ee, aa, bb, cc, F5, K5, in[14],  5);
238	ROUND(cc, dd, ee, aa, bb, F5, K5, in[1],  12);
239	ROUND(bb, cc, dd, ee, aa, F5, K5, in[3],  13);
240	ROUND(aa, bb, cc, dd, ee, F5, K5, in[8],  14);
241	ROUND(ee, aa, bb, cc, dd, F5, K5, in[11], 11);
242	ROUND(dd, ee, aa, bb, cc, F5, K5, in[6],   8);
243	ROUND(cc, dd, ee, aa, bb, F5, K5, in[15],  5);
244	ROUND(bb, cc, dd, ee, aa, F5, K5, in[13],  6);
245
246	/* round 5: right lane */
247	ROUND(bbb, ccc, ddd, eee, aaa, F1, KK5, in[12],  8);
248	ROUND(aaa, bbb, ccc, ddd, eee, F1, KK5, in[15],  5);
249	ROUND(eee, aaa, bbb, ccc, ddd, F1, KK5, in[10], 12);
250	ROUND(ddd, eee, aaa, bbb, ccc, F1, KK5, in[4],   9);
251	ROUND(ccc, ddd, eee, aaa, bbb, F1, KK5, in[1],  12);
252	ROUND(bbb, ccc, ddd, eee, aaa, F1, KK5, in[5],   5);
253	ROUND(aaa, bbb, ccc, ddd, eee, F1, KK5, in[8],  14);
254	ROUND(eee, aaa, bbb, ccc, ddd, F1, KK5, in[7],   6);
255	ROUND(ddd, eee, aaa, bbb, ccc, F1, KK5, in[6],   8);
256	ROUND(ccc, ddd, eee, aaa, bbb, F1, KK5, in[2],  13);
257	ROUND(bbb, ccc, ddd, eee, aaa, F1, KK5, in[13],  6);
258	ROUND(aaa, bbb, ccc, ddd, eee, F1, KK5, in[14],  5);
259	ROUND(eee, aaa, bbb, ccc, ddd, F1, KK5, in[0],  15);
260	ROUND(ddd, eee, aaa, bbb, ccc, F1, KK5, in[3],  13);
261	ROUND(ccc, ddd, eee, aaa, bbb, F1, KK5, in[9],  11);
262	ROUND(bbb, ccc, ddd, eee, aaa, F1, KK5, in[11], 11);
263
264	/* Swap contents of "e" registers */
265	tmp = ee; ee = eee; eee = tmp;
266
267	/* combine results */
268	state[0] += aa;
269	state[1] += bb;
270	state[2] += cc;
271	state[3] += dd;
272	state[4] += ee;
273	state[5] += aaa;
274	state[6] += bbb;
275	state[7] += ccc;
276	state[8] += ddd;
277	state[9] += eee;
278
279	return;
280}
281
282static int rmd320_init(struct shash_desc *desc)
283{
284	struct rmd320_ctx *rctx = shash_desc_ctx(desc);
285
286	rctx->byte_count = 0;
287
288	rctx->state[0] = RMD_H0;
289	rctx->state[1] = RMD_H1;
290	rctx->state[2] = RMD_H2;
291	rctx->state[3] = RMD_H3;
292	rctx->state[4] = RMD_H4;
293	rctx->state[5] = RMD_H5;
294	rctx->state[6] = RMD_H6;
295	rctx->state[7] = RMD_H7;
296	rctx->state[8] = RMD_H8;
297	rctx->state[9] = RMD_H9;
298
299	memset(rctx->buffer, 0, sizeof(rctx->buffer));
300
301	return 0;
302}
303
304static int rmd320_update(struct shash_desc *desc, const u8 *data,
305			 unsigned int len)
306{
307	struct rmd320_ctx *rctx = shash_desc_ctx(desc);
308	const u32 avail = sizeof(rctx->buffer) - (rctx->byte_count & 0x3f);
309
310	rctx->byte_count += len;
311
312	/* Enough space in buffer? If so copy and we're done */
313	if (avail > len) {
314		memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
315		       data, len);
316		goto out;
317	}
318
319	memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
320	       data, avail);
321
322	rmd320_transform(rctx->state, rctx->buffer);
323	data += avail;
324	len -= avail;
325
326	while (len >= sizeof(rctx->buffer)) {
327		memcpy(rctx->buffer, data, sizeof(rctx->buffer));
328		rmd320_transform(rctx->state, rctx->buffer);
329		data += sizeof(rctx->buffer);
330		len -= sizeof(rctx->buffer);
331	}
332
333	memcpy(rctx->buffer, data, len);
334
335out:
336	return 0;
337}
338
339/* Add padding and return the message digest. */
340static int rmd320_final(struct shash_desc *desc, u8 *out)
341{
342	struct rmd320_ctx *rctx = shash_desc_ctx(desc);
343	u32 i, index, padlen;
344	__le64 bits;
345	__le32 *dst = (__le32 *)out;
346	static const u8 padding[64] = { 0x80, };
347
348	bits = cpu_to_le64(rctx->byte_count << 3);
349
350	/* Pad out to 56 mod 64 */
351	index = rctx->byte_count & 0x3f;
352	padlen = (index < 56) ? (56 - index) : ((64+56) - index);
353	rmd320_update(desc, padding, padlen);
354
355	/* Append length */
356	rmd320_update(desc, (const u8 *)&bits, sizeof(bits));
357
358	/* Store state in digest */
359	for (i = 0; i < 10; i++)
360		dst[i] = cpu_to_le32p(&rctx->state[i]);
361
362	/* Wipe context */
363	memset(rctx, 0, sizeof(*rctx));
364
365	return 0;
366}
367
368static struct shash_alg alg = {
369	.digestsize	=	RMD320_DIGEST_SIZE,
370	.init		=	rmd320_init,
371	.update		=	rmd320_update,
372	.final		=	rmd320_final,
373	.descsize	=	sizeof(struct rmd320_ctx),
374	.base		=	{
375		.cra_name	 =	"rmd320",
376		.cra_flags	 =	CRYPTO_ALG_TYPE_SHASH,
377		.cra_blocksize	 =	RMD320_BLOCK_SIZE,
378		.cra_module	 =	THIS_MODULE,
379	}
380};
381
382static int __init rmd320_mod_init(void)
383{
384	return crypto_register_shash(&alg);
385}
386
387static void __exit rmd320_mod_fini(void)
388{
389	crypto_unregister_shash(&alg);
390}
391
392module_init(rmd320_mod_init);
393module_exit(rmd320_mod_fini);
394
395MODULE_LICENSE("GPL");
396MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
397MODULE_DESCRIPTION("RIPEMD-320 Message Digest");
398MODULE_ALIAS_CRYPTO("rmd320");
399