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937c30d7 JK |
1 | /* |
2 | * Glue Code for SSE2 assembler versions of Serpent Cipher | |
3 | * | |
4 | * Copyright (c) 2011 Jussi Kivilinna <jussi.kivilinna@mbnet.fi> | |
5 | * | |
6 | * Glue code based on aesni-intel_glue.c by: | |
7 | * Copyright (C) 2008, Intel Corp. | |
8 | * Author: Huang Ying <ying.huang@intel.com> | |
9 | * | |
10 | * CBC & ECB parts based on code (crypto/cbc.c,ecb.c) by: | |
11 | * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au> | |
12 | * CTR part based on code (crypto/ctr.c) by: | |
13 | * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> | |
14 | * | |
15 | * This program is free software; you can redistribute it and/or modify | |
16 | * it under the terms of the GNU General Public License as published by | |
17 | * the Free Software Foundation; either version 2 of the License, or | |
18 | * (at your option) any later version. | |
19 | * | |
20 | * This program is distributed in the hope that it will be useful, | |
21 | * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
22 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
23 | * GNU General Public License for more details. | |
24 | * | |
25 | * You should have received a copy of the GNU General Public License | |
26 | * along with this program; if not, write to the Free Software | |
27 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 | |
28 | * USA | |
29 | * | |
30 | */ | |
31 | ||
32 | #include <linux/module.h> | |
33 | #include <linux/hardirq.h> | |
34 | #include <linux/types.h> | |
35 | #include <linux/crypto.h> | |
36 | #include <linux/err.h> | |
37 | #include <crypto/algapi.h> | |
38 | #include <crypto/serpent.h> | |
39 | #include <crypto/cryptd.h> | |
40 | #include <crypto/b128ops.h> | |
41 | #include <crypto/ctr.h> | |
42 | #include <asm/i387.h> | |
43 | #include <asm/serpent.h> | |
44 | #include <crypto/scatterwalk.h> | |
45 | #include <linux/workqueue.h> | |
46 | #include <linux/spinlock.h> | |
47 | ||
48 | struct async_serpent_ctx { | |
49 | struct cryptd_ablkcipher *cryptd_tfm; | |
50 | }; | |
51 | ||
52 | static inline bool serpent_fpu_begin(bool fpu_enabled, unsigned int nbytes) | |
53 | { | |
54 | if (fpu_enabled) | |
55 | return true; | |
56 | ||
57 | /* SSE2 is only used when chunk to be processed is large enough, so | |
58 | * do not enable FPU until it is necessary. | |
59 | */ | |
60 | if (nbytes < SERPENT_BLOCK_SIZE * SERPENT_PARALLEL_BLOCKS) | |
61 | return false; | |
62 | ||
63 | kernel_fpu_begin(); | |
64 | return true; | |
65 | } | |
66 | ||
67 | static inline void serpent_fpu_end(bool fpu_enabled) | |
68 | { | |
69 | if (fpu_enabled) | |
70 | kernel_fpu_end(); | |
71 | } | |
72 | ||
73 | static int ecb_crypt(struct blkcipher_desc *desc, struct blkcipher_walk *walk, | |
74 | bool enc) | |
75 | { | |
76 | bool fpu_enabled = false; | |
77 | struct serpent_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
78 | const unsigned int bsize = SERPENT_BLOCK_SIZE; | |
79 | unsigned int nbytes; | |
80 | int err; | |
81 | ||
82 | err = blkcipher_walk_virt(desc, walk); | |
83 | desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; | |
84 | ||
85 | while ((nbytes = walk->nbytes)) { | |
86 | u8 *wsrc = walk->src.virt.addr; | |
87 | u8 *wdst = walk->dst.virt.addr; | |
88 | ||
89 | fpu_enabled = serpent_fpu_begin(fpu_enabled, nbytes); | |
90 | ||
91 | /* Process multi-block batch */ | |
92 | if (nbytes >= bsize * SERPENT_PARALLEL_BLOCKS) { | |
93 | do { | |
94 | if (enc) | |
95 | serpent_enc_blk_xway(ctx, wdst, wsrc); | |
96 | else | |
97 | serpent_dec_blk_xway(ctx, wdst, wsrc); | |
98 | ||
99 | wsrc += bsize * SERPENT_PARALLEL_BLOCKS; | |
100 | wdst += bsize * SERPENT_PARALLEL_BLOCKS; | |
101 | nbytes -= bsize * SERPENT_PARALLEL_BLOCKS; | |
102 | } while (nbytes >= bsize * SERPENT_PARALLEL_BLOCKS); | |
103 | ||
104 | if (nbytes < bsize) | |
105 | goto done; | |
106 | } | |
107 | ||
108 | /* Handle leftovers */ | |
109 | do { | |
110 | if (enc) | |
111 | __serpent_encrypt(ctx, wdst, wsrc); | |
112 | else | |
113 | __serpent_decrypt(ctx, wdst, wsrc); | |
114 | ||
115 | wsrc += bsize; | |
116 | wdst += bsize; | |
117 | nbytes -= bsize; | |
118 | } while (nbytes >= bsize); | |
119 | ||
120 | done: | |
121 | err = blkcipher_walk_done(desc, walk, nbytes); | |
122 | } | |
123 | ||
124 | serpent_fpu_end(fpu_enabled); | |
125 | return err; | |
126 | } | |
127 | ||
128 | static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, | |
129 | struct scatterlist *src, unsigned int nbytes) | |
130 | { | |
131 | struct blkcipher_walk walk; | |
132 | ||
133 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
134 | return ecb_crypt(desc, &walk, true); | |
135 | } | |
136 | ||
137 | static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, | |
138 | struct scatterlist *src, unsigned int nbytes) | |
139 | { | |
140 | struct blkcipher_walk walk; | |
141 | ||
142 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
143 | return ecb_crypt(desc, &walk, false); | |
144 | } | |
145 | ||
146 | static struct crypto_alg blk_ecb_alg = { | |
147 | .cra_name = "__ecb-serpent-sse2", | |
148 | .cra_driver_name = "__driver-ecb-serpent-sse2", | |
149 | .cra_priority = 0, | |
150 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
151 | .cra_blocksize = SERPENT_BLOCK_SIZE, | |
152 | .cra_ctxsize = sizeof(struct serpent_ctx), | |
153 | .cra_alignmask = 0, | |
154 | .cra_type = &crypto_blkcipher_type, | |
155 | .cra_module = THIS_MODULE, | |
156 | .cra_list = LIST_HEAD_INIT(blk_ecb_alg.cra_list), | |
157 | .cra_u = { | |
158 | .blkcipher = { | |
159 | .min_keysize = SERPENT_MIN_KEY_SIZE, | |
160 | .max_keysize = SERPENT_MAX_KEY_SIZE, | |
161 | .setkey = serpent_setkey, | |
162 | .encrypt = ecb_encrypt, | |
163 | .decrypt = ecb_decrypt, | |
164 | }, | |
165 | }, | |
166 | }; | |
167 | ||
168 | static unsigned int __cbc_encrypt(struct blkcipher_desc *desc, | |
169 | struct blkcipher_walk *walk) | |
170 | { | |
171 | struct serpent_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
172 | const unsigned int bsize = SERPENT_BLOCK_SIZE; | |
173 | unsigned int nbytes = walk->nbytes; | |
174 | u128 *src = (u128 *)walk->src.virt.addr; | |
175 | u128 *dst = (u128 *)walk->dst.virt.addr; | |
176 | u128 *iv = (u128 *)walk->iv; | |
177 | ||
178 | do { | |
179 | u128_xor(dst, src, iv); | |
180 | __serpent_encrypt(ctx, (u8 *)dst, (u8 *)dst); | |
181 | iv = dst; | |
182 | ||
183 | src += 1; | |
184 | dst += 1; | |
185 | nbytes -= bsize; | |
186 | } while (nbytes >= bsize); | |
187 | ||
188 | u128_xor((u128 *)walk->iv, (u128 *)walk->iv, iv); | |
189 | return nbytes; | |
190 | } | |
191 | ||
192 | static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst, | |
193 | struct scatterlist *src, unsigned int nbytes) | |
194 | { | |
195 | struct blkcipher_walk walk; | |
196 | int err; | |
197 | ||
198 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
199 | err = blkcipher_walk_virt(desc, &walk); | |
200 | ||
201 | while ((nbytes = walk.nbytes)) { | |
202 | nbytes = __cbc_encrypt(desc, &walk); | |
203 | err = blkcipher_walk_done(desc, &walk, nbytes); | |
204 | } | |
205 | ||
206 | return err; | |
207 | } | |
208 | ||
209 | static unsigned int __cbc_decrypt(struct blkcipher_desc *desc, | |
210 | struct blkcipher_walk *walk) | |
211 | { | |
212 | struct serpent_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
213 | const unsigned int bsize = SERPENT_BLOCK_SIZE; | |
214 | unsigned int nbytes = walk->nbytes; | |
215 | u128 *src = (u128 *)walk->src.virt.addr; | |
216 | u128 *dst = (u128 *)walk->dst.virt.addr; | |
217 | u128 ivs[SERPENT_PARALLEL_BLOCKS - 1]; | |
218 | u128 last_iv; | |
219 | int i; | |
220 | ||
221 | /* Start of the last block. */ | |
222 | src += nbytes / bsize - 1; | |
223 | dst += nbytes / bsize - 1; | |
224 | ||
225 | last_iv = *src; | |
226 | ||
227 | /* Process multi-block batch */ | |
228 | if (nbytes >= bsize * SERPENT_PARALLEL_BLOCKS) { | |
229 | do { | |
230 | nbytes -= bsize * (SERPENT_PARALLEL_BLOCKS - 1); | |
231 | src -= SERPENT_PARALLEL_BLOCKS - 1; | |
232 | dst -= SERPENT_PARALLEL_BLOCKS - 1; | |
233 | ||
234 | for (i = 0; i < SERPENT_PARALLEL_BLOCKS - 1; i++) | |
235 | ivs[i] = src[i]; | |
236 | ||
237 | serpent_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src); | |
238 | ||
239 | for (i = 0; i < SERPENT_PARALLEL_BLOCKS - 1; i++) | |
240 | u128_xor(dst + (i + 1), dst + (i + 1), ivs + i); | |
241 | ||
242 | nbytes -= bsize; | |
243 | if (nbytes < bsize) | |
244 | goto done; | |
245 | ||
246 | u128_xor(dst, dst, src - 1); | |
247 | src -= 1; | |
248 | dst -= 1; | |
249 | } while (nbytes >= bsize * SERPENT_PARALLEL_BLOCKS); | |
250 | ||
251 | if (nbytes < bsize) | |
252 | goto done; | |
253 | } | |
254 | ||
255 | /* Handle leftovers */ | |
256 | for (;;) { | |
257 | __serpent_decrypt(ctx, (u8 *)dst, (u8 *)src); | |
258 | ||
259 | nbytes -= bsize; | |
260 | if (nbytes < bsize) | |
261 | break; | |
262 | ||
263 | u128_xor(dst, dst, src - 1); | |
264 | src -= 1; | |
265 | dst -= 1; | |
266 | } | |
267 | ||
268 | done: | |
269 | u128_xor(dst, dst, (u128 *)walk->iv); | |
270 | *(u128 *)walk->iv = last_iv; | |
271 | ||
272 | return nbytes; | |
273 | } | |
274 | ||
275 | static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst, | |
276 | struct scatterlist *src, unsigned int nbytes) | |
277 | { | |
278 | bool fpu_enabled = false; | |
279 | struct blkcipher_walk walk; | |
280 | int err; | |
281 | ||
282 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
283 | err = blkcipher_walk_virt(desc, &walk); | |
284 | desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; | |
285 | ||
286 | while ((nbytes = walk.nbytes)) { | |
287 | fpu_enabled = serpent_fpu_begin(fpu_enabled, nbytes); | |
288 | nbytes = __cbc_decrypt(desc, &walk); | |
289 | err = blkcipher_walk_done(desc, &walk, nbytes); | |
290 | } | |
291 | ||
292 | serpent_fpu_end(fpu_enabled); | |
293 | return err; | |
294 | } | |
295 | ||
296 | static struct crypto_alg blk_cbc_alg = { | |
297 | .cra_name = "__cbc-serpent-sse2", | |
298 | .cra_driver_name = "__driver-cbc-serpent-sse2", | |
299 | .cra_priority = 0, | |
300 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
301 | .cra_blocksize = SERPENT_BLOCK_SIZE, | |
302 | .cra_ctxsize = sizeof(struct serpent_ctx), | |
303 | .cra_alignmask = 0, | |
304 | .cra_type = &crypto_blkcipher_type, | |
305 | .cra_module = THIS_MODULE, | |
306 | .cra_list = LIST_HEAD_INIT(blk_cbc_alg.cra_list), | |
307 | .cra_u = { | |
308 | .blkcipher = { | |
309 | .min_keysize = SERPENT_MIN_KEY_SIZE, | |
310 | .max_keysize = SERPENT_MAX_KEY_SIZE, | |
311 | .setkey = serpent_setkey, | |
312 | .encrypt = cbc_encrypt, | |
313 | .decrypt = cbc_decrypt, | |
314 | }, | |
315 | }, | |
316 | }; | |
317 | ||
318 | static inline void u128_to_be128(be128 *dst, const u128 *src) | |
319 | { | |
320 | dst->a = cpu_to_be64(src->a); | |
321 | dst->b = cpu_to_be64(src->b); | |
322 | } | |
323 | ||
324 | static inline void be128_to_u128(u128 *dst, const be128 *src) | |
325 | { | |
326 | dst->a = be64_to_cpu(src->a); | |
327 | dst->b = be64_to_cpu(src->b); | |
328 | } | |
329 | ||
330 | static inline void u128_inc(u128 *i) | |
331 | { | |
332 | i->b++; | |
333 | if (!i->b) | |
334 | i->a++; | |
335 | } | |
336 | ||
337 | static void ctr_crypt_final(struct blkcipher_desc *desc, | |
338 | struct blkcipher_walk *walk) | |
339 | { | |
340 | struct serpent_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
341 | u8 *ctrblk = walk->iv; | |
342 | u8 keystream[SERPENT_BLOCK_SIZE]; | |
343 | u8 *src = walk->src.virt.addr; | |
344 | u8 *dst = walk->dst.virt.addr; | |
345 | unsigned int nbytes = walk->nbytes; | |
346 | ||
347 | __serpent_encrypt(ctx, keystream, ctrblk); | |
348 | crypto_xor(keystream, src, nbytes); | |
349 | memcpy(dst, keystream, nbytes); | |
350 | ||
351 | crypto_inc(ctrblk, SERPENT_BLOCK_SIZE); | |
352 | } | |
353 | ||
354 | static unsigned int __ctr_crypt(struct blkcipher_desc *desc, | |
355 | struct blkcipher_walk *walk) | |
356 | { | |
357 | struct serpent_ctx *ctx = crypto_blkcipher_ctx(desc->tfm); | |
358 | const unsigned int bsize = SERPENT_BLOCK_SIZE; | |
359 | unsigned int nbytes = walk->nbytes; | |
360 | u128 *src = (u128 *)walk->src.virt.addr; | |
361 | u128 *dst = (u128 *)walk->dst.virt.addr; | |
362 | u128 ctrblk; | |
363 | be128 ctrblocks[SERPENT_PARALLEL_BLOCKS]; | |
364 | int i; | |
365 | ||
366 | be128_to_u128(&ctrblk, (be128 *)walk->iv); | |
367 | ||
368 | /* Process multi-block batch */ | |
369 | if (nbytes >= bsize * SERPENT_PARALLEL_BLOCKS) { | |
370 | do { | |
371 | /* create ctrblks for parallel encrypt */ | |
372 | for (i = 0; i < SERPENT_PARALLEL_BLOCKS; i++) { | |
373 | if (dst != src) | |
374 | dst[i] = src[i]; | |
375 | ||
376 | u128_to_be128(&ctrblocks[i], &ctrblk); | |
377 | u128_inc(&ctrblk); | |
378 | } | |
379 | ||
380 | serpent_enc_blk_xway_xor(ctx, (u8 *)dst, | |
381 | (u8 *)ctrblocks); | |
382 | ||
383 | src += SERPENT_PARALLEL_BLOCKS; | |
384 | dst += SERPENT_PARALLEL_BLOCKS; | |
385 | nbytes -= bsize * SERPENT_PARALLEL_BLOCKS; | |
386 | } while (nbytes >= bsize * SERPENT_PARALLEL_BLOCKS); | |
387 | ||
388 | if (nbytes < bsize) | |
389 | goto done; | |
390 | } | |
391 | ||
392 | /* Handle leftovers */ | |
393 | do { | |
394 | if (dst != src) | |
395 | *dst = *src; | |
396 | ||
397 | u128_to_be128(&ctrblocks[0], &ctrblk); | |
398 | u128_inc(&ctrblk); | |
399 | ||
400 | __serpent_encrypt(ctx, (u8 *)ctrblocks, (u8 *)ctrblocks); | |
401 | u128_xor(dst, dst, (u128 *)ctrblocks); | |
402 | ||
403 | src += 1; | |
404 | dst += 1; | |
405 | nbytes -= bsize; | |
406 | } while (nbytes >= bsize); | |
407 | ||
408 | done: | |
409 | u128_to_be128((be128 *)walk->iv, &ctrblk); | |
410 | return nbytes; | |
411 | } | |
412 | ||
413 | static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst, | |
414 | struct scatterlist *src, unsigned int nbytes) | |
415 | { | |
416 | bool fpu_enabled = false; | |
417 | struct blkcipher_walk walk; | |
418 | int err; | |
419 | ||
420 | blkcipher_walk_init(&walk, dst, src, nbytes); | |
421 | err = blkcipher_walk_virt_block(desc, &walk, SERPENT_BLOCK_SIZE); | |
422 | desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; | |
423 | ||
424 | while ((nbytes = walk.nbytes) >= SERPENT_BLOCK_SIZE) { | |
425 | fpu_enabled = serpent_fpu_begin(fpu_enabled, nbytes); | |
426 | nbytes = __ctr_crypt(desc, &walk); | |
427 | err = blkcipher_walk_done(desc, &walk, nbytes); | |
428 | } | |
429 | ||
430 | serpent_fpu_end(fpu_enabled); | |
431 | ||
432 | if (walk.nbytes) { | |
433 | ctr_crypt_final(desc, &walk); | |
434 | err = blkcipher_walk_done(desc, &walk, 0); | |
435 | } | |
436 | ||
437 | return err; | |
438 | } | |
439 | ||
440 | static struct crypto_alg blk_ctr_alg = { | |
441 | .cra_name = "__ctr-serpent-sse2", | |
442 | .cra_driver_name = "__driver-ctr-serpent-sse2", | |
443 | .cra_priority = 0, | |
444 | .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER, | |
445 | .cra_blocksize = 1, | |
446 | .cra_ctxsize = sizeof(struct serpent_ctx), | |
447 | .cra_alignmask = 0, | |
448 | .cra_type = &crypto_blkcipher_type, | |
449 | .cra_module = THIS_MODULE, | |
450 | .cra_list = LIST_HEAD_INIT(blk_ctr_alg.cra_list), | |
451 | .cra_u = { | |
452 | .blkcipher = { | |
453 | .min_keysize = SERPENT_MIN_KEY_SIZE, | |
454 | .max_keysize = SERPENT_MAX_KEY_SIZE, | |
455 | .ivsize = SERPENT_BLOCK_SIZE, | |
456 | .setkey = serpent_setkey, | |
457 | .encrypt = ctr_crypt, | |
458 | .decrypt = ctr_crypt, | |
459 | }, | |
460 | }, | |
461 | }; | |
462 | ||
463 | static int ablk_set_key(struct crypto_ablkcipher *tfm, const u8 *key, | |
464 | unsigned int key_len) | |
465 | { | |
466 | struct async_serpent_ctx *ctx = crypto_ablkcipher_ctx(tfm); | |
467 | struct crypto_ablkcipher *child = &ctx->cryptd_tfm->base; | |
468 | int err; | |
469 | ||
470 | crypto_ablkcipher_clear_flags(child, CRYPTO_TFM_REQ_MASK); | |
471 | crypto_ablkcipher_set_flags(child, crypto_ablkcipher_get_flags(tfm) | |
472 | & CRYPTO_TFM_REQ_MASK); | |
473 | err = crypto_ablkcipher_setkey(child, key, key_len); | |
474 | crypto_ablkcipher_set_flags(tfm, crypto_ablkcipher_get_flags(child) | |
475 | & CRYPTO_TFM_RES_MASK); | |
476 | return err; | |
477 | } | |
478 | ||
479 | static int __ablk_encrypt(struct ablkcipher_request *req) | |
480 | { | |
481 | struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); | |
482 | struct async_serpent_ctx *ctx = crypto_ablkcipher_ctx(tfm); | |
483 | struct blkcipher_desc desc; | |
484 | ||
485 | desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm); | |
486 | desc.info = req->info; | |
487 | desc.flags = 0; | |
488 | ||
489 | return crypto_blkcipher_crt(desc.tfm)->encrypt( | |
490 | &desc, req->dst, req->src, req->nbytes); | |
491 | } | |
492 | ||
493 | static int ablk_encrypt(struct ablkcipher_request *req) | |
494 | { | |
495 | struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); | |
496 | struct async_serpent_ctx *ctx = crypto_ablkcipher_ctx(tfm); | |
497 | ||
498 | if (!irq_fpu_usable()) { | |
499 | struct ablkcipher_request *cryptd_req = | |
500 | ablkcipher_request_ctx(req); | |
501 | ||
502 | memcpy(cryptd_req, req, sizeof(*req)); | |
503 | ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base); | |
504 | ||
505 | return crypto_ablkcipher_encrypt(cryptd_req); | |
506 | } else { | |
507 | return __ablk_encrypt(req); | |
508 | } | |
509 | } | |
510 | ||
511 | static int ablk_decrypt(struct ablkcipher_request *req) | |
512 | { | |
513 | struct crypto_ablkcipher *tfm = crypto_ablkcipher_reqtfm(req); | |
514 | struct async_serpent_ctx *ctx = crypto_ablkcipher_ctx(tfm); | |
515 | ||
516 | if (!irq_fpu_usable()) { | |
517 | struct ablkcipher_request *cryptd_req = | |
518 | ablkcipher_request_ctx(req); | |
519 | ||
520 | memcpy(cryptd_req, req, sizeof(*req)); | |
521 | ablkcipher_request_set_tfm(cryptd_req, &ctx->cryptd_tfm->base); | |
522 | ||
523 | return crypto_ablkcipher_decrypt(cryptd_req); | |
524 | } else { | |
525 | struct blkcipher_desc desc; | |
526 | ||
527 | desc.tfm = cryptd_ablkcipher_child(ctx->cryptd_tfm); | |
528 | desc.info = req->info; | |
529 | desc.flags = 0; | |
530 | ||
531 | return crypto_blkcipher_crt(desc.tfm)->decrypt( | |
532 | &desc, req->dst, req->src, req->nbytes); | |
533 | } | |
534 | } | |
535 | ||
536 | static void ablk_exit(struct crypto_tfm *tfm) | |
537 | { | |
538 | struct async_serpent_ctx *ctx = crypto_tfm_ctx(tfm); | |
539 | ||
540 | cryptd_free_ablkcipher(ctx->cryptd_tfm); | |
541 | } | |
542 | ||
543 | static void ablk_init_common(struct crypto_tfm *tfm, | |
544 | struct cryptd_ablkcipher *cryptd_tfm) | |
545 | { | |
546 | struct async_serpent_ctx *ctx = crypto_tfm_ctx(tfm); | |
547 | ||
548 | ctx->cryptd_tfm = cryptd_tfm; | |
549 | tfm->crt_ablkcipher.reqsize = sizeof(struct ablkcipher_request) + | |
550 | crypto_ablkcipher_reqsize(&cryptd_tfm->base); | |
551 | } | |
552 | ||
553 | static int ablk_ecb_init(struct crypto_tfm *tfm) | |
554 | { | |
555 | struct cryptd_ablkcipher *cryptd_tfm; | |
556 | ||
557 | cryptd_tfm = cryptd_alloc_ablkcipher("__driver-ecb-serpent-sse2", 0, 0); | |
558 | if (IS_ERR(cryptd_tfm)) | |
559 | return PTR_ERR(cryptd_tfm); | |
560 | ablk_init_common(tfm, cryptd_tfm); | |
561 | return 0; | |
562 | } | |
563 | ||
564 | static struct crypto_alg ablk_ecb_alg = { | |
565 | .cra_name = "ecb(serpent)", | |
566 | .cra_driver_name = "ecb-serpent-sse2", | |
567 | .cra_priority = 400, | |
568 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, | |
569 | .cra_blocksize = SERPENT_BLOCK_SIZE, | |
570 | .cra_ctxsize = sizeof(struct async_serpent_ctx), | |
571 | .cra_alignmask = 0, | |
572 | .cra_type = &crypto_ablkcipher_type, | |
573 | .cra_module = THIS_MODULE, | |
574 | .cra_list = LIST_HEAD_INIT(ablk_ecb_alg.cra_list), | |
575 | .cra_init = ablk_ecb_init, | |
576 | .cra_exit = ablk_exit, | |
577 | .cra_u = { | |
578 | .ablkcipher = { | |
579 | .min_keysize = SERPENT_MIN_KEY_SIZE, | |
580 | .max_keysize = SERPENT_MAX_KEY_SIZE, | |
581 | .setkey = ablk_set_key, | |
582 | .encrypt = ablk_encrypt, | |
583 | .decrypt = ablk_decrypt, | |
584 | }, | |
585 | }, | |
586 | }; | |
587 | ||
588 | static int ablk_cbc_init(struct crypto_tfm *tfm) | |
589 | { | |
590 | struct cryptd_ablkcipher *cryptd_tfm; | |
591 | ||
592 | cryptd_tfm = cryptd_alloc_ablkcipher("__driver-cbc-serpent-sse2", 0, 0); | |
593 | if (IS_ERR(cryptd_tfm)) | |
594 | return PTR_ERR(cryptd_tfm); | |
595 | ablk_init_common(tfm, cryptd_tfm); | |
596 | return 0; | |
597 | } | |
598 | ||
599 | static struct crypto_alg ablk_cbc_alg = { | |
600 | .cra_name = "cbc(serpent)", | |
601 | .cra_driver_name = "cbc-serpent-sse2", | |
602 | .cra_priority = 400, | |
603 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, | |
604 | .cra_blocksize = SERPENT_BLOCK_SIZE, | |
605 | .cra_ctxsize = sizeof(struct async_serpent_ctx), | |
606 | .cra_alignmask = 0, | |
607 | .cra_type = &crypto_ablkcipher_type, | |
608 | .cra_module = THIS_MODULE, | |
609 | .cra_list = LIST_HEAD_INIT(ablk_cbc_alg.cra_list), | |
610 | .cra_init = ablk_cbc_init, | |
611 | .cra_exit = ablk_exit, | |
612 | .cra_u = { | |
613 | .ablkcipher = { | |
614 | .min_keysize = SERPENT_MIN_KEY_SIZE, | |
615 | .max_keysize = SERPENT_MAX_KEY_SIZE, | |
616 | .ivsize = SERPENT_BLOCK_SIZE, | |
617 | .setkey = ablk_set_key, | |
618 | .encrypt = __ablk_encrypt, | |
619 | .decrypt = ablk_decrypt, | |
620 | }, | |
621 | }, | |
622 | }; | |
623 | ||
624 | static int ablk_ctr_init(struct crypto_tfm *tfm) | |
625 | { | |
626 | struct cryptd_ablkcipher *cryptd_tfm; | |
627 | ||
628 | cryptd_tfm = cryptd_alloc_ablkcipher("__driver-ctr-serpent-sse2", 0, 0); | |
629 | if (IS_ERR(cryptd_tfm)) | |
630 | return PTR_ERR(cryptd_tfm); | |
631 | ablk_init_common(tfm, cryptd_tfm); | |
632 | return 0; | |
633 | } | |
634 | ||
635 | static struct crypto_alg ablk_ctr_alg = { | |
636 | .cra_name = "ctr(serpent)", | |
637 | .cra_driver_name = "ctr-serpent-sse2", | |
638 | .cra_priority = 400, | |
639 | .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC, | |
640 | .cra_blocksize = 1, | |
641 | .cra_ctxsize = sizeof(struct async_serpent_ctx), | |
642 | .cra_alignmask = 0, | |
643 | .cra_type = &crypto_ablkcipher_type, | |
644 | .cra_module = THIS_MODULE, | |
645 | .cra_list = LIST_HEAD_INIT(ablk_ctr_alg.cra_list), | |
646 | .cra_init = ablk_ctr_init, | |
647 | .cra_exit = ablk_exit, | |
648 | .cra_u = { | |
649 | .ablkcipher = { | |
650 | .min_keysize = SERPENT_MIN_KEY_SIZE, | |
651 | .max_keysize = SERPENT_MAX_KEY_SIZE, | |
652 | .ivsize = SERPENT_BLOCK_SIZE, | |
653 | .setkey = ablk_set_key, | |
654 | .encrypt = ablk_encrypt, | |
655 | .decrypt = ablk_encrypt, | |
656 | .geniv = "chainiv", | |
657 | }, | |
658 | }, | |
659 | }; | |
660 | ||
661 | static int __init serpent_sse2_init(void) | |
662 | { | |
663 | int err; | |
664 | ||
665 | if (!cpu_has_xmm2) { | |
666 | printk(KERN_INFO "SSE2 instructions are not detected.\n"); | |
667 | return -ENODEV; | |
668 | } | |
669 | ||
670 | err = crypto_register_alg(&blk_ecb_alg); | |
671 | if (err) | |
672 | goto blk_ecb_err; | |
673 | err = crypto_register_alg(&blk_cbc_alg); | |
674 | if (err) | |
675 | goto blk_cbc_err; | |
676 | err = crypto_register_alg(&blk_ctr_alg); | |
677 | if (err) | |
678 | goto blk_ctr_err; | |
679 | err = crypto_register_alg(&ablk_ecb_alg); | |
680 | if (err) | |
681 | goto ablk_ecb_err; | |
682 | err = crypto_register_alg(&ablk_cbc_alg); | |
683 | if (err) | |
684 | goto ablk_cbc_err; | |
685 | err = crypto_register_alg(&ablk_ctr_alg); | |
686 | if (err) | |
687 | goto ablk_ctr_err; | |
688 | return err; | |
689 | ||
690 | ablk_ctr_err: | |
691 | crypto_unregister_alg(&ablk_cbc_alg); | |
692 | ablk_cbc_err: | |
693 | crypto_unregister_alg(&ablk_ecb_alg); | |
694 | ablk_ecb_err: | |
695 | crypto_unregister_alg(&blk_ctr_alg); | |
696 | blk_ctr_err: | |
697 | crypto_unregister_alg(&blk_cbc_alg); | |
698 | blk_cbc_err: | |
699 | crypto_unregister_alg(&blk_ecb_alg); | |
700 | blk_ecb_err: | |
701 | return err; | |
702 | } | |
703 | ||
704 | static void __exit serpent_sse2_exit(void) | |
705 | { | |
706 | crypto_unregister_alg(&ablk_ctr_alg); | |
707 | crypto_unregister_alg(&ablk_cbc_alg); | |
708 | crypto_unregister_alg(&ablk_ecb_alg); | |
709 | crypto_unregister_alg(&blk_ctr_alg); | |
710 | crypto_unregister_alg(&blk_cbc_alg); | |
711 | crypto_unregister_alg(&blk_ecb_alg); | |
712 | } | |
713 | ||
714 | module_init(serpent_sse2_init); | |
715 | module_exit(serpent_sse2_exit); | |
716 | ||
717 | MODULE_DESCRIPTION("Serpent Cipher Algorithm, SSE2 optimized"); | |
718 | MODULE_LICENSE("GPL"); | |
719 | MODULE_ALIAS("serpent"); |