1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /*
3  * Cryptographic API.
4  *
5  * RIPEMD-128 - RACE Integrity Primitives Evaluation Message Digest.
6  *
7  * Based on the reference implementation by Antoon Bosselaers, ESAT-COSIC
8  *
9  * Copyright (c) 2008 Adrian-Ken Rueegsegger <ken@codelabs.ch>
10  */
11 #include <crypto/internal/hash.h>
12 #include <linux/init.h>
13 #include <linux/module.h>
14 #include <linux/mm.h>
15 #include <linux/types.h>
16 #include <asm/byteorder.h>
17 
18 #include "ripemd.h"
19 
20 struct rmd128_ctx {
21 	u64 byte_count;
22 	u32 state[4];
23 	__le32 buffer[16];
24 };
25 
26 #define K1  RMD_K1
27 #define K2  RMD_K2
28 #define K3  RMD_K3
29 #define K4  RMD_K4
30 #define KK1 RMD_K6
31 #define KK2 RMD_K7
32 #define KK3 RMD_K8
33 #define KK4 RMD_K1
34 
35 #define F1(x, y, z) (x ^ y ^ z)		/* XOR */
36 #define F2(x, y, z) (z ^ (x & (y ^ z)))	/* x ? y : z */
37 #define F3(x, y, z) ((x | ~y) ^ z)
38 #define F4(x, y, z) (y ^ (z & (x ^ y)))	/* z ? x : y */
39 
40 #define ROUND(a, b, c, d, f, k, x, s)  { \
41 	(a) += f((b), (c), (d)) + le32_to_cpup(&(x)) + (k);	\
42 	(a) = rol32((a), (s)); \
43 }
44 
rmd128_transform(u32 * state,const __le32 * in)45 static void rmd128_transform(u32 *state, const __le32 *in)
46 {
47 	u32 aa, bb, cc, dd, aaa, bbb, ccc, ddd;
48 
49 	/* Initialize left lane */
50 	aa = state[0];
51 	bb = state[1];
52 	cc = state[2];
53 	dd = state[3];
54 
55 	/* Initialize right lane */
56 	aaa = state[0];
57 	bbb = state[1];
58 	ccc = state[2];
59 	ddd = state[3];
60 
61 	/* round 1: left lane */
62 	ROUND(aa, bb, cc, dd, F1, K1, in[0],  11);
63 	ROUND(dd, aa, bb, cc, F1, K1, in[1],  14);
64 	ROUND(cc, dd, aa, bb, F1, K1, in[2],  15);
65 	ROUND(bb, cc, dd, aa, F1, K1, in[3],  12);
66 	ROUND(aa, bb, cc, dd, F1, K1, in[4],   5);
67 	ROUND(dd, aa, bb, cc, F1, K1, in[5],   8);
68 	ROUND(cc, dd, aa, bb, F1, K1, in[6],   7);
69 	ROUND(bb, cc, dd, aa, F1, K1, in[7],   9);
70 	ROUND(aa, bb, cc, dd, F1, K1, in[8],  11);
71 	ROUND(dd, aa, bb, cc, F1, K1, in[9],  13);
72 	ROUND(cc, dd, aa, bb, F1, K1, in[10], 14);
73 	ROUND(bb, cc, dd, aa, F1, K1, in[11], 15);
74 	ROUND(aa, bb, cc, dd, F1, K1, in[12],  6);
75 	ROUND(dd, aa, bb, cc, F1, K1, in[13],  7);
76 	ROUND(cc, dd, aa, bb, F1, K1, in[14],  9);
77 	ROUND(bb, cc, dd, aa, F1, K1, in[15],  8);
78 
79 	/* round 2: left lane */
80 	ROUND(aa, bb, cc, dd, F2, K2, in[7],   7);
81 	ROUND(dd, aa, bb, cc, F2, K2, in[4],   6);
82 	ROUND(cc, dd, aa, bb, F2, K2, in[13],  8);
83 	ROUND(bb, cc, dd, aa, F2, K2, in[1],  13);
84 	ROUND(aa, bb, cc, dd, F2, K2, in[10], 11);
85 	ROUND(dd, aa, bb, cc, F2, K2, in[6],   9);
86 	ROUND(cc, dd, aa, bb, F2, K2, in[15],  7);
87 	ROUND(bb, cc, dd, aa, F2, K2, in[3],  15);
88 	ROUND(aa, bb, cc, dd, F2, K2, in[12],  7);
89 	ROUND(dd, aa, bb, cc, F2, K2, in[0],  12);
90 	ROUND(cc, dd, aa, bb, F2, K2, in[9],  15);
91 	ROUND(bb, cc, dd, aa, F2, K2, in[5],   9);
92 	ROUND(aa, bb, cc, dd, F2, K2, in[2],  11);
93 	ROUND(dd, aa, bb, cc, F2, K2, in[14],  7);
94 	ROUND(cc, dd, aa, bb, F2, K2, in[11], 13);
95 	ROUND(bb, cc, dd, aa, F2, K2, in[8],  12);
96 
97 	/* round 3: left lane */
98 	ROUND(aa, bb, cc, dd, F3, K3, in[3],  11);
99 	ROUND(dd, aa, bb, cc, F3, K3, in[10], 13);
100 	ROUND(cc, dd, aa, bb, F3, K3, in[14],  6);
101 	ROUND(bb, cc, dd, aa, F3, K3, in[4],   7);
102 	ROUND(aa, bb, cc, dd, F3, K3, in[9],  14);
103 	ROUND(dd, aa, bb, cc, F3, K3, in[15],  9);
104 	ROUND(cc, dd, aa, bb, F3, K3, in[8],  13);
105 	ROUND(bb, cc, dd, aa, F3, K3, in[1],  15);
106 	ROUND(aa, bb, cc, dd, F3, K3, in[2],  14);
107 	ROUND(dd, aa, bb, cc, F3, K3, in[7],   8);
108 	ROUND(cc, dd, aa, bb, F3, K3, in[0],  13);
109 	ROUND(bb, cc, dd, aa, F3, K3, in[6],   6);
110 	ROUND(aa, bb, cc, dd, F3, K3, in[13],  5);
111 	ROUND(dd, aa, bb, cc, F3, K3, in[11], 12);
112 	ROUND(cc, dd, aa, bb, F3, K3, in[5],   7);
113 	ROUND(bb, cc, dd, aa, F3, K3, in[12],  5);
114 
115 	/* round 4: left lane */
116 	ROUND(aa, bb, cc, dd, F4, K4, in[1],  11);
117 	ROUND(dd, aa, bb, cc, F4, K4, in[9],  12);
118 	ROUND(cc, dd, aa, bb, F4, K4, in[11], 14);
119 	ROUND(bb, cc, dd, aa, F4, K4, in[10], 15);
120 	ROUND(aa, bb, cc, dd, F4, K4, in[0],  14);
121 	ROUND(dd, aa, bb, cc, F4, K4, in[8],  15);
122 	ROUND(cc, dd, aa, bb, F4, K4, in[12],  9);
123 	ROUND(bb, cc, dd, aa, F4, K4, in[4],   8);
124 	ROUND(aa, bb, cc, dd, F4, K4, in[13],  9);
125 	ROUND(dd, aa, bb, cc, F4, K4, in[3],  14);
126 	ROUND(cc, dd, aa, bb, F4, K4, in[7],   5);
127 	ROUND(bb, cc, dd, aa, F4, K4, in[15],  6);
128 	ROUND(aa, bb, cc, dd, F4, K4, in[14],  8);
129 	ROUND(dd, aa, bb, cc, F4, K4, in[5],   6);
130 	ROUND(cc, dd, aa, bb, F4, K4, in[6],   5);
131 	ROUND(bb, cc, dd, aa, F4, K4, in[2],  12);
132 
133 	/* round 1: right lane */
134 	ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[5],   8);
135 	ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[14],  9);
136 	ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[7],   9);
137 	ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[0],  11);
138 	ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[9],  13);
139 	ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[2],  15);
140 	ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[11], 15);
141 	ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[4],   5);
142 	ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[13],  7);
143 	ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[6],   7);
144 	ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[15],  8);
145 	ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[8],  11);
146 	ROUND(aaa, bbb, ccc, ddd, F4, KK1, in[1],  14);
147 	ROUND(ddd, aaa, bbb, ccc, F4, KK1, in[10], 14);
148 	ROUND(ccc, ddd, aaa, bbb, F4, KK1, in[3],  12);
149 	ROUND(bbb, ccc, ddd, aaa, F4, KK1, in[12],  6);
150 
151 	/* round 2: right lane */
152 	ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[6],   9);
153 	ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[11], 13);
154 	ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[3],  15);
155 	ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[7],   7);
156 	ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[0],  12);
157 	ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[13],  8);
158 	ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[5],   9);
159 	ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[10], 11);
160 	ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[14],  7);
161 	ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[15],  7);
162 	ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[8],  12);
163 	ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[12],  7);
164 	ROUND(aaa, bbb, ccc, ddd, F3, KK2, in[4],   6);
165 	ROUND(ddd, aaa, bbb, ccc, F3, KK2, in[9],  15);
166 	ROUND(ccc, ddd, aaa, bbb, F3, KK2, in[1],  13);
167 	ROUND(bbb, ccc, ddd, aaa, F3, KK2, in[2],  11);
168 
169 	/* round 3: right lane */
170 	ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[15],  9);
171 	ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[5],   7);
172 	ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[1],  15);
173 	ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[3],  11);
174 	ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[7],   8);
175 	ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[14],  6);
176 	ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[6],   6);
177 	ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[9],  14);
178 	ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[11], 12);
179 	ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[8],  13);
180 	ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[12],  5);
181 	ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[2],  14);
182 	ROUND(aaa, bbb, ccc, ddd, F2, KK3, in[10], 13);
183 	ROUND(ddd, aaa, bbb, ccc, F2, KK3, in[0],  13);
184 	ROUND(ccc, ddd, aaa, bbb, F2, KK3, in[4],   7);
185 	ROUND(bbb, ccc, ddd, aaa, F2, KK3, in[13],  5);
186 
187 	/* round 4: right lane */
188 	ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[8],  15);
189 	ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[6],   5);
190 	ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[4],   8);
191 	ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[1],  11);
192 	ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[3],  14);
193 	ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[11], 14);
194 	ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[15],  6);
195 	ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[0],  14);
196 	ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[5],   6);
197 	ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[12],  9);
198 	ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[2],  12);
199 	ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[13],  9);
200 	ROUND(aaa, bbb, ccc, ddd, F1, KK4, in[9],  12);
201 	ROUND(ddd, aaa, bbb, ccc, F1, KK4, in[7],   5);
202 	ROUND(ccc, ddd, aaa, bbb, F1, KK4, in[10], 15);
203 	ROUND(bbb, ccc, ddd, aaa, F1, KK4, in[14],  8);
204 
205 	/* combine results */
206 	ddd += cc + state[1];		/* final result for state[0] */
207 	state[1] = state[2] + dd + aaa;
208 	state[2] = state[3] + aa + bbb;
209 	state[3] = state[0] + bb + ccc;
210 	state[0] = ddd;
211 }
212 
rmd128_init(struct shash_desc * desc)213 static int rmd128_init(struct shash_desc *desc)
214 {
215 	struct rmd128_ctx *rctx = shash_desc_ctx(desc);
216 
217 	rctx->byte_count = 0;
218 
219 	rctx->state[0] = RMD_H0;
220 	rctx->state[1] = RMD_H1;
221 	rctx->state[2] = RMD_H2;
222 	rctx->state[3] = RMD_H3;
223 
224 	memset(rctx->buffer, 0, sizeof(rctx->buffer));
225 
226 	return 0;
227 }
228 
rmd128_update(struct shash_desc * desc,const u8 * data,unsigned int len)229 static int rmd128_update(struct shash_desc *desc, const u8 *data,
230 			 unsigned int len)
231 {
232 	struct rmd128_ctx *rctx = shash_desc_ctx(desc);
233 	const u32 avail = sizeof(rctx->buffer) - (rctx->byte_count & 0x3f);
234 
235 	rctx->byte_count += len;
236 
237 	/* Enough space in buffer? If so copy and we're done */
238 	if (avail > len) {
239 		memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
240 		       data, len);
241 		goto out;
242 	}
243 
244 	memcpy((char *)rctx->buffer + (sizeof(rctx->buffer) - avail),
245 	       data, avail);
246 
247 	rmd128_transform(rctx->state, rctx->buffer);
248 	data += avail;
249 	len -= avail;
250 
251 	while (len >= sizeof(rctx->buffer)) {
252 		memcpy(rctx->buffer, data, sizeof(rctx->buffer));
253 		rmd128_transform(rctx->state, rctx->buffer);
254 		data += sizeof(rctx->buffer);
255 		len -= sizeof(rctx->buffer);
256 	}
257 
258 	memcpy(rctx->buffer, data, len);
259 
260 out:
261 	return 0;
262 }
263 
264 /* Add padding and return the message digest. */
rmd128_final(struct shash_desc * desc,u8 * out)265 static int rmd128_final(struct shash_desc *desc, u8 *out)
266 {
267 	struct rmd128_ctx *rctx = shash_desc_ctx(desc);
268 	u32 i, index, padlen;
269 	__le64 bits;
270 	__le32 *dst = (__le32 *)out;
271 	static const u8 padding[64] = { 0x80, };
272 
273 	bits = cpu_to_le64(rctx->byte_count << 3);
274 
275 	/* Pad out to 56 mod 64 */
276 	index = rctx->byte_count & 0x3f;
277 	padlen = (index < 56) ? (56 - index) : ((64+56) - index);
278 	rmd128_update(desc, padding, padlen);
279 
280 	/* Append length */
281 	rmd128_update(desc, (const u8 *)&bits, sizeof(bits));
282 
283 	/* Store state in digest */
284 	for (i = 0; i < 4; i++)
285 		dst[i] = cpu_to_le32p(&rctx->state[i]);
286 
287 	/* Wipe context */
288 	memset(rctx, 0, sizeof(*rctx));
289 
290 	return 0;
291 }
292 
293 static struct shash_alg alg = {
294 	.digestsize	=	RMD128_DIGEST_SIZE,
295 	.init		=	rmd128_init,
296 	.update		=	rmd128_update,
297 	.final		=	rmd128_final,
298 	.descsize	=	sizeof(struct rmd128_ctx),
299 	.base		=	{
300 		.cra_name	 =	"rmd128",
301 		.cra_driver_name =	"rmd128-generic",
302 		.cra_blocksize	 =	RMD128_BLOCK_SIZE,
303 		.cra_module	 =	THIS_MODULE,
304 	}
305 };
306 
rmd128_mod_init(void)307 static int __init rmd128_mod_init(void)
308 {
309 	return crypto_register_shash(&alg);
310 }
311 
rmd128_mod_fini(void)312 static void __exit rmd128_mod_fini(void)
313 {
314 	crypto_unregister_shash(&alg);
315 }
316 
317 subsys_initcall(rmd128_mod_init);
318 module_exit(rmd128_mod_fini);
319 
320 MODULE_LICENSE("GPL");
321 MODULE_AUTHOR("Adrian-Ken Rueegsegger <ken@codelabs.ch>");
322 MODULE_DESCRIPTION("RIPEMD-128 Message Digest");
323 MODULE_ALIAS_CRYPTO("rmd128");
324