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");
330MODULE_ALIAS_CRYPTO("rmd128");
331