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 
25 struct 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 
rmd256_transform(u32 * state,const __le32 * in)50 static void rmd256_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[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 	swap(aa, aaa);
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 	swap(bb, bbb);
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 	swap(cc, ccc);
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 	swap(dd, ddd);
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 
rmd256_init(struct shash_desc * desc)233 static int rmd256_init(struct shash_desc *desc)
234 {
235 	struct rmd256_ctx *rctx = shash_desc_ctx(desc);
236 
237 	rctx->byte_count = 0;
238 
239 	rctx->state[0] = RMD_H0;
240 	rctx->state[1] = RMD_H1;
241 	rctx->state[2] = RMD_H2;
242 	rctx->state[3] = RMD_H3;
243 	rctx->state[4] = RMD_H5;
244 	rctx->state[5] = RMD_H6;
245 	rctx->state[6] = RMD_H7;
246 	rctx->state[7] = RMD_H8;
247 
248 	memset(rctx->buffer, 0, sizeof(rctx->buffer));
249 
250 	return 0;
251 }
252 
rmd256_update(struct shash_desc * desc,const u8 * data,unsigned int len)253 static int rmd256_update(struct shash_desc *desc, const u8 *data,
254 			 unsigned int len)
255 {
256 	struct rmd256_ctx *rctx = shash_desc_ctx(desc);
257 	const u32 avail = sizeof(rctx->buffer) - (rctx->byte_count & 0x3f);
258 
259 	rctx->byte_count += len;
260 
261 	/* Enough space in buffer? If so copy and we're done */
262 	if (avail > len) {
263 		memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
264 		       data, len);
265 		goto out;
266 	}
267 
268 	memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
269 	       data, avail);
270 
271 	rmd256_transform(rctx->state, rctx->buffer);
272 	data += avail;
273 	len -= avail;
274 
275 	while (len >= sizeof(rctx->buffer)) {
276 		memcpy(rctx->buffer, data, sizeof(rctx->buffer));
277 		rmd256_transform(rctx->state, rctx->buffer);
278 		data += sizeof(rctx->buffer);
279 		len -= sizeof(rctx->buffer);
280 	}
281 
282 	memcpy(rctx->buffer, data, len);
283 
284 out:
285 	return 0;
286 }
287 
288 /* Add padding and return the message digest. */
rmd256_final(struct shash_desc * desc,u8 * out)289 static int rmd256_final(struct shash_desc *desc, u8 *out)
290 {
291 	struct rmd256_ctx *rctx = shash_desc_ctx(desc);
292 	u32 i, index, padlen;
293 	__le64 bits;
294 	__le32 *dst = (__le32 *)out;
295 	static const u8 padding[64] = { 0x80, };
296 
297 	bits = cpu_to_le64(rctx->byte_count << 3);
298 
299 	/* Pad out to 56 mod 64 */
300 	index = rctx->byte_count & 0x3f;
301 	padlen = (index < 56) ? (56 - index) : ((64+56) - index);
302 	rmd256_update(desc, padding, padlen);
303 
304 	/* Append length */
305 	rmd256_update(desc, (const u8 *)&bits, sizeof(bits));
306 
307 	/* Store state in digest */
308 	for (i = 0; i < 8; i++)
309 		dst[i] = cpu_to_le32p(&rctx->state[i]);
310 
311 	/* Wipe context */
312 	memset(rctx, 0, sizeof(*rctx));
313 
314 	return 0;
315 }
316 
317 static struct shash_alg alg = {
318 	.digestsize	=	RMD256_DIGEST_SIZE,
319 	.init		=	rmd256_init,
320 	.update		=	rmd256_update,
321 	.final		=	rmd256_final,
322 	.descsize	=	sizeof(struct rmd256_ctx),
323 	.base		=	{
324 		.cra_name	 =	"rmd256",
325 		.cra_blocksize	 =	RMD256_BLOCK_SIZE,
326 		.cra_module	 =	THIS_MODULE,
327 	}
328 };
329 
rmd256_mod_init(void)330 static int __init rmd256_mod_init(void)
331 {
332 	return crypto_register_shash(&alg);
333 }
334 
rmd256_mod_fini(void)335 static void __exit rmd256_mod_fini(void)
336 {
337 	crypto_unregister_shash(&alg);
338 }
339 
340 module_init(rmd256_mod_init);
341 module_exit(rmd256_mod_fini);
342 
343 MODULE_LICENSE("GPL");
344 MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
345 MODULE_DESCRIPTION("RIPEMD-256 Message Digest");
346 MODULE_ALIAS_CRYPTO("rmd256");
347