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Linux/crypto/sha3_generic.c

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

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