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1 | /* | |
2 | * Cryptographic API. | |
3 | * | |
4 | * SHA-3, as specified in | |
5 | * http://nvlpubs.nist.gov/nistpubs/FIPS/NIST.FIPS.202.pdf | |
6 | * | |
7 | * SHA-3 code by Jeff Garzik <jeff@garzik.org> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify it | |
10 | * under the terms of the GNU General Public License as published by the Free | |
11 | * Software Foundation; either version 2 of the License, or (at your option)• | |
12 | * any later version. | |
13 | * | |
14 | */ | |
15 | #include <crypto/internal/hash.h> | |
16 | #include <linux/init.h> | |
17 | #include <linux/module.h> | |
18 | #include <linux/types.h> | |
19 | #include <crypto/sha3.h> | |
20 | #include <asm/byteorder.h> | |
21 | #include <asm/unaligned.h> | |
22 | ||
23 | #define KECCAK_ROUNDS 24 | |
24 | ||
25 | #define ROTL64(x, y) (((x) << (y)) | ((x) >> (64 - (y)))) | |
26 | ||
27 | static const u64 keccakf_rndc[24] = { | |
28 | 0x0000000000000001ULL, 0x0000000000008082ULL, 0x800000000000808aULL, | |
29 | 0x8000000080008000ULL, 0x000000000000808bULL, 0x0000000080000001ULL, | |
30 | 0x8000000080008081ULL, 0x8000000000008009ULL, 0x000000000000008aULL, | |
31 | 0x0000000000000088ULL, 0x0000000080008009ULL, 0x000000008000000aULL, | |
32 | 0x000000008000808bULL, 0x800000000000008bULL, 0x8000000000008089ULL, | |
33 | 0x8000000000008003ULL, 0x8000000000008002ULL, 0x8000000000000080ULL, | |
34 | 0x000000000000800aULL, 0x800000008000000aULL, 0x8000000080008081ULL, | |
35 | 0x8000000000008080ULL, 0x0000000080000001ULL, 0x8000000080008008ULL | |
36 | }; | |
37 | ||
38 | static const int keccakf_rotc[24] = { | |
39 | 1, 3, 6, 10, 15, 21, 28, 36, 45, 55, 2, 14, | |
40 | 27, 41, 56, 8, 25, 43, 62, 18, 39, 61, 20, 44 | |
41 | }; | |
42 | ||
43 | static const int keccakf_piln[24] = { | |
44 | 10, 7, 11, 17, 18, 3, 5, 16, 8, 21, 24, 4, | |
45 | 15, 23, 19, 13, 12, 2, 20, 14, 22, 9, 6, 1 | |
46 | }; | |
47 | ||
48 | /* update the state with given number of rounds */ | |
49 | ||
50 | static void keccakf(u64 st[25]) | |
51 | { | |
52 | int i, j, round; | |
53 | u64 t, bc[5]; | |
54 | ||
55 | for (round = 0; round < KECCAK_ROUNDS; round++) { | |
56 | ||
57 | /* Theta */ | |
58 | for (i = 0; i < 5; i++) | |
59 | bc[i] = st[i] ^ st[i + 5] ^ st[i + 10] ^ st[i + 15] | |
60 | ^ st[i + 20]; | |
61 | ||
62 | for (i = 0; i < 5; i++) { | |
63 | t = bc[(i + 4) % 5] ^ ROTL64(bc[(i + 1) % 5], 1); | |
64 | for (j = 0; j < 25; j += 5) | |
65 | st[j + i] ^= t; | |
66 | } | |
67 | ||
68 | /* Rho Pi */ | |
69 | t = st[1]; | |
70 | for (i = 0; i < 24; i++) { | |
71 | j = keccakf_piln[i]; | |
72 | bc[0] = st[j]; | |
73 | st[j] = ROTL64(t, keccakf_rotc[i]); | |
74 | t = bc[0]; | |
75 | } | |
76 | ||
77 | /* Chi */ | |
78 | for (j = 0; j < 25; j += 5) { | |
79 | for (i = 0; i < 5; i++) | |
80 | bc[i] = st[j + i]; | |
81 | for (i = 0; i < 5; i++) | |
82 | st[j + i] ^= (~bc[(i + 1) % 5]) & | |
83 | bc[(i + 2) % 5]; | |
84 | } | |
85 | ||
86 | /* Iota */ | |
87 | st[0] ^= keccakf_rndc[round]; | |
88 | } | |
89 | } | |
90 | ||
91 | static void sha3_init(struct sha3_state *sctx, unsigned int digest_sz) | |
92 | { | |
93 | memset(sctx, 0, sizeof(*sctx)); | |
94 | sctx->md_len = digest_sz; | |
95 | sctx->rsiz = 200 - 2 * digest_sz; | |
96 | sctx->rsizw = sctx->rsiz / 8; | |
97 | } | |
98 | ||
99 | static int sha3_224_init(struct shash_desc *desc) | |
100 | { | |
101 | struct sha3_state *sctx = shash_desc_ctx(desc); | |
102 | ||
103 | sha3_init(sctx, SHA3_224_DIGEST_SIZE); | |
104 | return 0; | |
105 | } | |
106 | ||
107 | static int sha3_256_init(struct shash_desc *desc) | |
108 | { | |
109 | struct sha3_state *sctx = shash_desc_ctx(desc); | |
110 | ||
111 | sha3_init(sctx, SHA3_256_DIGEST_SIZE); | |
112 | return 0; | |
113 | } | |
114 | ||
115 | static int sha3_384_init(struct shash_desc *desc) | |
116 | { | |
117 | struct sha3_state *sctx = shash_desc_ctx(desc); | |
118 | ||
119 | sha3_init(sctx, SHA3_384_DIGEST_SIZE); | |
120 | return 0; | |
121 | } | |
122 | ||
123 | static int sha3_512_init(struct shash_desc *desc) | |
124 | { | |
125 | struct sha3_state *sctx = shash_desc_ctx(desc); | |
126 | ||
127 | sha3_init(sctx, SHA3_512_DIGEST_SIZE); | |
128 | return 0; | |
129 | } | |
130 | ||
131 | static int sha3_update(struct shash_desc *desc, const u8 *data, | |
132 | unsigned int len) | |
133 | { | |
134 | struct sha3_state *sctx = shash_desc_ctx(desc); | |
135 | unsigned int done; | |
136 | const u8 *src; | |
137 | ||
138 | done = 0; | |
139 | src = data; | |
140 | ||
141 | if ((sctx->partial + len) > (sctx->rsiz - 1)) { | |
142 | if (sctx->partial) { | |
143 | done = -sctx->partial; | |
144 | memcpy(sctx->buf + sctx->partial, data, | |
145 | done + sctx->rsiz); | |
146 | src = sctx->buf; | |
147 | } | |
148 | ||
149 | do { | |
150 | unsigned int i; | |
151 | ||
152 | for (i = 0; i < sctx->rsizw; i++) | |
153 | sctx->st[i] ^= get_unaligned_le64(src + 8 * i); | |
154 | keccakf(sctx->st); | |
155 | ||
156 | done += sctx->rsiz; | |
157 | src = data + done; | |
158 | } while (done + (sctx->rsiz - 1) < len); | |
159 | ||
160 | sctx->partial = 0; | |
161 | } | |
162 | memcpy(sctx->buf + sctx->partial, src, len - done); | |
163 | sctx->partial += (len - done); | |
164 | ||
165 | return 0; | |
166 | } | |
167 | ||
168 | static int sha3_final(struct shash_desc *desc, u8 *out) | |
169 | { | |
170 | struct sha3_state *sctx = shash_desc_ctx(desc); | |
171 | unsigned int i, inlen = sctx->partial; | |
172 | ||
173 | sctx->buf[inlen++] = 0x06; | |
174 | memset(sctx->buf + inlen, 0, sctx->rsiz - inlen); | |
175 | sctx->buf[sctx->rsiz - 1] |= 0x80; | |
176 | ||
177 | for (i = 0; i < sctx->rsizw; i++) | |
178 | sctx->st[i] ^= get_unaligned_le64(sctx->buf + 8 * i); | |
179 | ||
180 | keccakf(sctx->st); | |
181 | ||
182 | for (i = 0; i < sctx->rsizw; i++) | |
183 | sctx->st[i] = cpu_to_le64(sctx->st[i]); | |
184 | ||
185 | memcpy(out, sctx->st, sctx->md_len); | |
186 | ||
187 | memset(sctx, 0, sizeof(*sctx)); | |
188 | return 0; | |
189 | } | |
190 | ||
191 | static struct shash_alg sha3_224 = { | |
192 | .digestsize = SHA3_224_DIGEST_SIZE, | |
193 | .init = sha3_224_init, | |
194 | .update = sha3_update, | |
195 | .final = sha3_final, | |
196 | .descsize = sizeof(struct sha3_state), | |
197 | .base = { | |
198 | .cra_name = "sha3-224", | |
199 | .cra_driver_name = "sha3-224-generic", | |
200 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
201 | .cra_blocksize = SHA3_224_BLOCK_SIZE, | |
202 | .cra_module = THIS_MODULE, | |
203 | } | |
204 | }; | |
205 | ||
206 | static struct shash_alg sha3_256 = { | |
207 | .digestsize = SHA3_256_DIGEST_SIZE, | |
208 | .init = sha3_256_init, | |
209 | .update = sha3_update, | |
210 | .final = sha3_final, | |
211 | .descsize = sizeof(struct sha3_state), | |
212 | .base = { | |
213 | .cra_name = "sha3-256", | |
214 | .cra_driver_name = "sha3-256-generic", | |
215 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
216 | .cra_blocksize = SHA3_256_BLOCK_SIZE, | |
217 | .cra_module = THIS_MODULE, | |
218 | } | |
219 | }; | |
220 | ||
221 | static struct shash_alg sha3_384 = { | |
222 | .digestsize = SHA3_384_DIGEST_SIZE, | |
223 | .init = sha3_384_init, | |
224 | .update = sha3_update, | |
225 | .final = sha3_final, | |
226 | .descsize = sizeof(struct sha3_state), | |
227 | .base = { | |
228 | .cra_name = "sha3-384", | |
229 | .cra_driver_name = "sha3-384-generic", | |
230 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
231 | .cra_blocksize = SHA3_384_BLOCK_SIZE, | |
232 | .cra_module = THIS_MODULE, | |
233 | } | |
234 | }; | |
235 | ||
236 | static struct shash_alg sha3_512 = { | |
237 | .digestsize = SHA3_512_DIGEST_SIZE, | |
238 | .init = sha3_512_init, | |
239 | .update = sha3_update, | |
240 | .final = sha3_final, | |
241 | .descsize = sizeof(struct sha3_state), | |
242 | .base = { | |
243 | .cra_name = "sha3-512", | |
244 | .cra_driver_name = "sha3-512-generic", | |
245 | .cra_flags = CRYPTO_ALG_TYPE_SHASH, | |
246 | .cra_blocksize = SHA3_512_BLOCK_SIZE, | |
247 | .cra_module = THIS_MODULE, | |
248 | } | |
249 | }; | |
250 | ||
251 | static int __init sha3_generic_mod_init(void) | |
252 | { | |
253 | int ret; | |
254 | ||
255 | ret = crypto_register_shash(&sha3_224); | |
256 | if (ret < 0) | |
257 | goto err_out; | |
258 | ret = crypto_register_shash(&sha3_256); | |
259 | if (ret < 0) | |
260 | goto err_out_224; | |
261 | ret = crypto_register_shash(&sha3_384); | |
262 | if (ret < 0) | |
263 | goto err_out_256; | |
264 | ret = crypto_register_shash(&sha3_512); | |
265 | if (ret < 0) | |
266 | goto err_out_384; | |
267 | ||
268 | return 0; | |
269 | ||
270 | err_out_384: | |
271 | crypto_unregister_shash(&sha3_384); | |
272 | err_out_256: | |
273 | crypto_unregister_shash(&sha3_256); | |
274 | err_out_224: | |
275 | crypto_unregister_shash(&sha3_224); | |
276 | err_out: | |
277 | return ret; | |
278 | } | |
279 | ||
280 | static void __exit sha3_generic_mod_fini(void) | |
281 | { | |
282 | crypto_unregister_shash(&sha3_224); | |
283 | crypto_unregister_shash(&sha3_256); | |
284 | crypto_unregister_shash(&sha3_384); | |
285 | crypto_unregister_shash(&sha3_512); | |
286 | } | |
287 | ||
288 | module_init(sha3_generic_mod_init); | |
289 | module_exit(sha3_generic_mod_fini); | |
290 | ||
291 | MODULE_LICENSE("GPL"); | |
292 | MODULE_DESCRIPTION("SHA-3 Secure Hash Algorithm"); | |
293 | ||
294 | MODULE_ALIAS_CRYPTO("sha3-224"); | |
295 | MODULE_ALIAS_CRYPTO("sha3-224-generic"); | |
296 | MODULE_ALIAS_CRYPTO("sha3-256"); | |
297 | MODULE_ALIAS_CRYPTO("sha3-256-generic"); | |
298 | MODULE_ALIAS_CRYPTO("sha3-384"); | |
299 | MODULE_ALIAS_CRYPTO("sha3-384-generic"); | |
300 | MODULE_ALIAS_CRYPTO("sha3-512"); | |
301 | MODULE_ALIAS_CRYPTO("sha3-512-generic"); |