blob: a68be626017c2b7eb9785e02b6806f8ed665f7ae
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"); |
302 |