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lguest: fix typo
[linux-2.6/btrfs-unstable.git] / arch / x86 / crypto / cast6_avx_glue.c
blob15e5f85a50115a6eba3659011e35d5b95ff97558
1 /*
2 * Glue Code for the AVX assembler implemention of the Cast6 Cipher
3 *
4 * Copyright (C) 2012 Johannes Goetzfried
5 * <Johannes.Goetzfried@informatik.stud.uni-erlangen.de>
6 *
7 * This program is free software; you can redistribute it and/or modify
8 * it under the terms of the GNU General Public License as published by
9 * the Free Software Foundation; either version 2 of the License, or
10 * (at your option) any later version.
11 *
12 * This program is distributed in the hope that it will be useful,
13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 * GNU General Public License for more details.
16 *
17 * You should have received a copy of the GNU General Public License
18 * along with this program; if not, write to the Free Software
19 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
20 * USA
21 *
22 */
23
24 #include <linux/module.h>
25 #include <linux/hardirq.h>
26 #include <linux/types.h>
27 #include <linux/crypto.h>
28 #include <linux/err.h>
29 #include <crypto/algapi.h>
30 #include <crypto/cast6.h>
31 #include <crypto/cryptd.h>
32 #include <crypto/b128ops.h>
33 #include <crypto/ctr.h>
34 #include <crypto/lrw.h>
35 #include <crypto/xts.h>
36 #include <asm/xcr.h>
37 #include <asm/xsave.h>
38 #include <asm/crypto/ablk_helper.h>
39 #include <asm/crypto/glue_helper.h>
40
41 #define CAST6_PARALLEL_BLOCKS 8
42
43 asmlinkage void __cast6_enc_blk_8way(struct cast6_ctx *ctx, u8 *dst,
44 const u8 *src, bool xor);
45 asmlinkage void cast6_dec_blk_8way(struct cast6_ctx *ctx, u8 *dst,
46 const u8 *src);
47
48 static inline void cast6_enc_blk_xway(struct cast6_ctx *ctx, u8 *dst,
49 const u8 *src)
50 {
51 __cast6_enc_blk_8way(ctx, dst, src, false);
52 }
53
54 static inline void cast6_enc_blk_xway_xor(struct cast6_ctx *ctx, u8 *dst,
55 const u8 *src)
56 {
57 __cast6_enc_blk_8way(ctx, dst, src, true);
58 }
59
60 static inline void cast6_dec_blk_xway(struct cast6_ctx *ctx, u8 *dst,
61 const u8 *src)
62 {
63 cast6_dec_blk_8way(ctx, dst, src);
64 }
65
66
67 static void cast6_decrypt_cbc_xway(void *ctx, u128 *dst, const u128 *src)
68 {
69 u128 ivs[CAST6_PARALLEL_BLOCKS - 1];
70 unsigned int j;
71
72 for (j = 0; j < CAST6_PARALLEL_BLOCKS - 1; j++)
73 ivs[j] = src[j];
74
75 cast6_dec_blk_xway(ctx, (u8 *)dst, (u8 *)src);
76
77 for (j = 0; j < CAST6_PARALLEL_BLOCKS - 1; j++)
78 u128_xor(dst + (j + 1), dst + (j + 1), ivs + j);
79 }
80
81 static void cast6_crypt_ctr(void *ctx, u128 *dst, const u128 *src, u128 *iv)
82 {
83 be128 ctrblk;
84
85 u128_to_be128(&ctrblk, iv);
86 u128_inc(iv);
87
88 __cast6_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
89 u128_xor(dst, src, (u128 *)&ctrblk);
90 }
91
92 static void cast6_crypt_ctr_xway(void *ctx, u128 *dst, const u128 *src,
93 u128 *iv)
94 {
95 be128 ctrblks[CAST6_PARALLEL_BLOCKS];
96 unsigned int i;
97
98 for (i = 0; i < CAST6_PARALLEL_BLOCKS; i++) {
99 if (dst != src)
100 dst[i] = src[i];
101
102 u128_to_be128(&ctrblks[i], iv);
103 u128_inc(iv);
104 }
105
106 cast6_enc_blk_xway_xor(ctx, (u8 *)dst, (u8 *)ctrblks);
107 }
108
109 static const struct common_glue_ctx cast6_enc = {
110 .num_funcs = 2,
111 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
112
113 .funcs = { {
114 .num_blocks = CAST6_PARALLEL_BLOCKS,
115 .fn_u = { .ecb = GLUE_FUNC_CAST(cast6_enc_blk_xway) }
116 }, {
117 .num_blocks = 1,
118 .fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_encrypt) }
119 } }
120 };
121
122 static const struct common_glue_ctx cast6_ctr = {
123 .num_funcs = 2,
124 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
125
126 .funcs = { {
127 .num_blocks = CAST6_PARALLEL_BLOCKS,
128 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_crypt_ctr_xway) }
129 }, {
130 .num_blocks = 1,
131 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_crypt_ctr) }
132 } }
133 };
134
135 static const struct common_glue_ctx cast6_dec = {
136 .num_funcs = 2,
137 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
138
139 .funcs = { {
140 .num_blocks = CAST6_PARALLEL_BLOCKS,
141 .fn_u = { .ecb = GLUE_FUNC_CAST(cast6_dec_blk_xway) }
142 }, {
143 .num_blocks = 1,
144 .fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_decrypt) }
145 } }
146 };
147
148 static const struct common_glue_ctx cast6_dec_cbc = {
149 .num_funcs = 2,
150 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
151
152 .funcs = { {
153 .num_blocks = CAST6_PARALLEL_BLOCKS,
154 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(cast6_decrypt_cbc_xway) }
155 }, {
156 .num_blocks = 1,
157 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__cast6_decrypt) }
158 } }
159 };
160
161 static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
162 struct scatterlist *src, unsigned int nbytes)
163 {
164 return glue_ecb_crypt_128bit(&cast6_enc, desc, dst, src, nbytes);
165 }
166
167 static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
168 struct scatterlist *src, unsigned int nbytes)
169 {
170 return glue_ecb_crypt_128bit(&cast6_dec, desc, dst, src, nbytes);
171 }
172
173 static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
174 struct scatterlist *src, unsigned int nbytes)
175 {
176 return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(__cast6_encrypt), desc,
177 dst, src, nbytes);
178 }
179
180 static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
181 struct scatterlist *src, unsigned int nbytes)
182 {
183 return glue_cbc_decrypt_128bit(&cast6_dec_cbc, desc, dst, src,
184 nbytes);
185 }
186
187 static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
188 struct scatterlist *src, unsigned int nbytes)
189 {
190 return glue_ctr_crypt_128bit(&cast6_ctr, desc, dst, src, nbytes);
191 }
192
193 static inline bool cast6_fpu_begin(bool fpu_enabled, unsigned int nbytes)
194 {
195 return glue_fpu_begin(CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS,
196 NULL, fpu_enabled, nbytes);
197 }
198
199 static inline void cast6_fpu_end(bool fpu_enabled)
200 {
201 glue_fpu_end(fpu_enabled);
202 }
203
204 struct crypt_priv {
205 struct cast6_ctx *ctx;
206 bool fpu_enabled;
207 };
208
209 static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
210 {
211 const unsigned int bsize = CAST6_BLOCK_SIZE;
212 struct crypt_priv *ctx = priv;
213 int i;
214
215 ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes);
216
217 if (nbytes == bsize * CAST6_PARALLEL_BLOCKS) {
218 cast6_enc_blk_xway(ctx->ctx, srcdst, srcdst);
219 return;
220 }
221
222 for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
223 __cast6_encrypt(ctx->ctx, srcdst, srcdst);
224 }
225
226 static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
227 {
228 const unsigned int bsize = CAST6_BLOCK_SIZE;
229 struct crypt_priv *ctx = priv;
230 int i;
231
232 ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes);
233
234 if (nbytes == bsize * CAST6_PARALLEL_BLOCKS) {
235 cast6_dec_blk_xway(ctx->ctx, srcdst, srcdst);
236 return;
237 }
238
239 for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
240 __cast6_decrypt(ctx->ctx, srcdst, srcdst);
241 }
242
243 struct cast6_lrw_ctx {
244 struct lrw_table_ctx lrw_table;
245 struct cast6_ctx cast6_ctx;
246 };
247
248 static int lrw_cast6_setkey(struct crypto_tfm *tfm, const u8 *key,
249 unsigned int keylen)
250 {
251 struct cast6_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
252 int err;
253
254 err = __cast6_setkey(&ctx->cast6_ctx, key, keylen - CAST6_BLOCK_SIZE,
255 &tfm->crt_flags);
256 if (err)
257 return err;
258
259 return lrw_init_table(&ctx->lrw_table, key + keylen - CAST6_BLOCK_SIZE);
260 }
261
262 static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
263 struct scatterlist *src, unsigned int nbytes)
264 {
265 struct cast6_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
266 be128 buf[CAST6_PARALLEL_BLOCKS];
267 struct crypt_priv crypt_ctx = {
268 .ctx = &ctx->cast6_ctx,
269 .fpu_enabled = false,
270 };
271 struct lrw_crypt_req req = {
272 .tbuf = buf,
273 .tbuflen = sizeof(buf),
274
275 .table_ctx = &ctx->lrw_table,
276 .crypt_ctx = &crypt_ctx,
277 .crypt_fn = encrypt_callback,
278 };
279 int ret;
280
281 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
282 ret = lrw_crypt(desc, dst, src, nbytes, &req);
283 cast6_fpu_end(crypt_ctx.fpu_enabled);
284
285 return ret;
286 }
287
288 static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
289 struct scatterlist *src, unsigned int nbytes)
290 {
291 struct cast6_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
292 be128 buf[CAST6_PARALLEL_BLOCKS];
293 struct crypt_priv crypt_ctx = {
294 .ctx = &ctx->cast6_ctx,
295 .fpu_enabled = false,
296 };
297 struct lrw_crypt_req req = {
298 .tbuf = buf,
299 .tbuflen = sizeof(buf),
300
301 .table_ctx = &ctx->lrw_table,
302 .crypt_ctx = &crypt_ctx,
303 .crypt_fn = decrypt_callback,
304 };
305 int ret;
306
307 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
308 ret = lrw_crypt(desc, dst, src, nbytes, &req);
309 cast6_fpu_end(crypt_ctx.fpu_enabled);
310
311 return ret;
312 }
313
314 static void lrw_exit_tfm(struct crypto_tfm *tfm)
315 {
316 struct cast6_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
317
318 lrw_free_table(&ctx->lrw_table);
319 }
320
321 struct cast6_xts_ctx {
322 struct cast6_ctx tweak_ctx;
323 struct cast6_ctx crypt_ctx;
324 };
325
326 static int xts_cast6_setkey(struct crypto_tfm *tfm, const u8 *key,
327 unsigned int keylen)
328 {
329 struct cast6_xts_ctx *ctx = crypto_tfm_ctx(tfm);
330 u32 *flags = &tfm->crt_flags;
331 int err;
332
333 /* key consists of keys of equal size concatenated, therefore
334 * the length must be even
335 */
336 if (keylen % 2) {
337 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
338 return -EINVAL;
339 }
340
341 /* first half of xts-key is for crypt */
342 err = __cast6_setkey(&ctx->crypt_ctx, key, keylen / 2, flags);
343 if (err)
344 return err;
345
346 /* second half of xts-key is for tweak */
347 return __cast6_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2,
348 flags);
349 }
350
351 static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
352 struct scatterlist *src, unsigned int nbytes)
353 {
354 struct cast6_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
355 be128 buf[CAST6_PARALLEL_BLOCKS];
356 struct crypt_priv crypt_ctx = {
357 .ctx = &ctx->crypt_ctx,
358 .fpu_enabled = false,
359 };
360 struct xts_crypt_req req = {
361 .tbuf = buf,
362 .tbuflen = sizeof(buf),
363
364 .tweak_ctx = &ctx->tweak_ctx,
365 .tweak_fn = XTS_TWEAK_CAST(__cast6_encrypt),
366 .crypt_ctx = &crypt_ctx,
367 .crypt_fn = encrypt_callback,
368 };
369 int ret;
370
371 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
372 ret = xts_crypt(desc, dst, src, nbytes, &req);
373 cast6_fpu_end(crypt_ctx.fpu_enabled);
374
375 return ret;
376 }
377
378 static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
379 struct scatterlist *src, unsigned int nbytes)
380 {
381 struct cast6_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
382 be128 buf[CAST6_PARALLEL_BLOCKS];
383 struct crypt_priv crypt_ctx = {
384 .ctx = &ctx->crypt_ctx,
385 .fpu_enabled = false,
386 };
387 struct xts_crypt_req req = {
388 .tbuf = buf,
389 .tbuflen = sizeof(buf),
390
391 .tweak_ctx = &ctx->tweak_ctx,
392 .tweak_fn = XTS_TWEAK_CAST(__cast6_encrypt),
393 .crypt_ctx = &crypt_ctx,
394 .crypt_fn = decrypt_callback,
395 };
396 int ret;
397
398 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
399 ret = xts_crypt(desc, dst, src, nbytes, &req);
400 cast6_fpu_end(crypt_ctx.fpu_enabled);
401
402 return ret;
403 }
404
405 static struct crypto_alg cast6_algs[10] = { {
406 .cra_name = "__ecb-cast6-avx",
407 .cra_driver_name = "__driver-ecb-cast6-avx",
408 .cra_priority = 0,
409 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
410 .cra_blocksize = CAST6_BLOCK_SIZE,
411 .cra_ctxsize = sizeof(struct cast6_ctx),
412 .cra_alignmask = 0,
413 .cra_type = &crypto_blkcipher_type,
414 .cra_module = THIS_MODULE,
415 .cra_u = {
416 .blkcipher = {
417 .min_keysize = CAST6_MIN_KEY_SIZE,
418 .max_keysize = CAST6_MAX_KEY_SIZE,
419 .setkey = cast6_setkey,
420 .encrypt = ecb_encrypt,
421 .decrypt = ecb_decrypt,
422 },
423 },
424 }, {
425 .cra_name = "__cbc-cast6-avx",
426 .cra_driver_name = "__driver-cbc-cast6-avx",
427 .cra_priority = 0,
428 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
429 .cra_blocksize = CAST6_BLOCK_SIZE,
430 .cra_ctxsize = sizeof(struct cast6_ctx),
431 .cra_alignmask = 0,
432 .cra_type = &crypto_blkcipher_type,
433 .cra_module = THIS_MODULE,
434 .cra_u = {
435 .blkcipher = {
436 .min_keysize = CAST6_MIN_KEY_SIZE,
437 .max_keysize = CAST6_MAX_KEY_SIZE,
438 .setkey = cast6_setkey,
439 .encrypt = cbc_encrypt,
440 .decrypt = cbc_decrypt,
441 },
442 },
443 }, {
444 .cra_name = "__ctr-cast6-avx",
445 .cra_driver_name = "__driver-ctr-cast6-avx",
446 .cra_priority = 0,
447 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
448 .cra_blocksize = 1,
449 .cra_ctxsize = sizeof(struct cast6_ctx),
450 .cra_alignmask = 0,
451 .cra_type = &crypto_blkcipher_type,
452 .cra_module = THIS_MODULE,
453 .cra_u = {
454 .blkcipher = {
455 .min_keysize = CAST6_MIN_KEY_SIZE,
456 .max_keysize = CAST6_MAX_KEY_SIZE,
457 .ivsize = CAST6_BLOCK_SIZE,
458 .setkey = cast6_setkey,
459 .encrypt = ctr_crypt,
460 .decrypt = ctr_crypt,
461 },
462 },
463 }, {
464 .cra_name = "__lrw-cast6-avx",
465 .cra_driver_name = "__driver-lrw-cast6-avx",
466 .cra_priority = 0,
467 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
468 .cra_blocksize = CAST6_BLOCK_SIZE,
469 .cra_ctxsize = sizeof(struct cast6_lrw_ctx),
470 .cra_alignmask = 0,
471 .cra_type = &crypto_blkcipher_type,
472 .cra_module = THIS_MODULE,
473 .cra_exit = lrw_exit_tfm,
474 .cra_u = {
475 .blkcipher = {
476 .min_keysize = CAST6_MIN_KEY_SIZE +
477 CAST6_BLOCK_SIZE,
478 .max_keysize = CAST6_MAX_KEY_SIZE +
479 CAST6_BLOCK_SIZE,
480 .ivsize = CAST6_BLOCK_SIZE,
481 .setkey = lrw_cast6_setkey,
482 .encrypt = lrw_encrypt,
483 .decrypt = lrw_decrypt,
484 },
485 },
486 }, {
487 .cra_name = "__xts-cast6-avx",
488 .cra_driver_name = "__driver-xts-cast6-avx",
489 .cra_priority = 0,
490 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
491 .cra_blocksize = CAST6_BLOCK_SIZE,
492 .cra_ctxsize = sizeof(struct cast6_xts_ctx),
493 .cra_alignmask = 0,
494 .cra_type = &crypto_blkcipher_type,
495 .cra_module = THIS_MODULE,
496 .cra_u = {
497 .blkcipher = {
498 .min_keysize = CAST6_MIN_KEY_SIZE * 2,
499 .max_keysize = CAST6_MAX_KEY_SIZE * 2,
500 .ivsize = CAST6_BLOCK_SIZE,
501 .setkey = xts_cast6_setkey,
502 .encrypt = xts_encrypt,
503 .decrypt = xts_decrypt,
504 },
505 },
506 }, {
507 .cra_name = "ecb(cast6)",
508 .cra_driver_name = "ecb-cast6-avx",
509 .cra_priority = 200,
510 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
511 .cra_blocksize = CAST6_BLOCK_SIZE,
512 .cra_ctxsize = sizeof(struct async_helper_ctx),
513 .cra_alignmask = 0,
514 .cra_type = &crypto_ablkcipher_type,
515 .cra_module = THIS_MODULE,
516 .cra_init = ablk_init,
517 .cra_exit = ablk_exit,
518 .cra_u = {
519 .ablkcipher = {
520 .min_keysize = CAST6_MIN_KEY_SIZE,
521 .max_keysize = CAST6_MAX_KEY_SIZE,
522 .setkey = ablk_set_key,
523 .encrypt = ablk_encrypt,
524 .decrypt = ablk_decrypt,
525 },
526 },
527 }, {
528 .cra_name = "cbc(cast6)",
529 .cra_driver_name = "cbc-cast6-avx",
530 .cra_priority = 200,
531 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
532 .cra_blocksize = CAST6_BLOCK_SIZE,
533 .cra_ctxsize = sizeof(struct async_helper_ctx),
534 .cra_alignmask = 0,
535 .cra_type = &crypto_ablkcipher_type,
536 .cra_module = THIS_MODULE,
537 .cra_init = ablk_init,
538 .cra_exit = ablk_exit,
539 .cra_u = {
540 .ablkcipher = {
541 .min_keysize = CAST6_MIN_KEY_SIZE,
542 .max_keysize = CAST6_MAX_KEY_SIZE,
543 .ivsize = CAST6_BLOCK_SIZE,
544 .setkey = ablk_set_key,
545 .encrypt = __ablk_encrypt,
546 .decrypt = ablk_decrypt,
547 },
548 },
549 }, {
550 .cra_name = "ctr(cast6)",
551 .cra_driver_name = "ctr-cast6-avx",
552 .cra_priority = 200,
553 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
554 .cra_blocksize = 1,
555 .cra_ctxsize = sizeof(struct async_helper_ctx),
556 .cra_alignmask = 0,
557 .cra_type = &crypto_ablkcipher_type,
558 .cra_module = THIS_MODULE,
559 .cra_init = ablk_init,
560 .cra_exit = ablk_exit,
561 .cra_u = {
562 .ablkcipher = {
563 .min_keysize = CAST6_MIN_KEY_SIZE,
564 .max_keysize = CAST6_MAX_KEY_SIZE,
565 .ivsize = CAST6_BLOCK_SIZE,
566 .setkey = ablk_set_key,
567 .encrypt = ablk_encrypt,
568 .decrypt = ablk_encrypt,
569 .geniv = "chainiv",
570 },
571 },
572 }, {
573 .cra_name = "lrw(cast6)",
574 .cra_driver_name = "lrw-cast6-avx",
575 .cra_priority = 200,
576 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
577 .cra_blocksize = CAST6_BLOCK_SIZE,
578 .cra_ctxsize = sizeof(struct async_helper_ctx),
579 .cra_alignmask = 0,
580 .cra_type = &crypto_ablkcipher_type,
581 .cra_module = THIS_MODULE,
582 .cra_init = ablk_init,
583 .cra_exit = ablk_exit,
584 .cra_u = {
585 .ablkcipher = {
586 .min_keysize = CAST6_MIN_KEY_SIZE +
587 CAST6_BLOCK_SIZE,
588 .max_keysize = CAST6_MAX_KEY_SIZE +
589 CAST6_BLOCK_SIZE,
590 .ivsize = CAST6_BLOCK_SIZE,
591 .setkey = ablk_set_key,
592 .encrypt = ablk_encrypt,
593 .decrypt = ablk_decrypt,
594 },
595 },
596 }, {
597 .cra_name = "xts(cast6)",
598 .cra_driver_name = "xts-cast6-avx",
599 .cra_priority = 200,
600 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
601 .cra_blocksize = CAST6_BLOCK_SIZE,
602 .cra_ctxsize = sizeof(struct async_helper_ctx),
603 .cra_alignmask = 0,
604 .cra_type = &crypto_ablkcipher_type,
605 .cra_module = THIS_MODULE,
606 .cra_init = ablk_init,
607 .cra_exit = ablk_exit,
608 .cra_u = {
609 .ablkcipher = {
610 .min_keysize = CAST6_MIN_KEY_SIZE * 2,
611 .max_keysize = CAST6_MAX_KEY_SIZE * 2,
612 .ivsize = CAST6_BLOCK_SIZE,
613 .setkey = ablk_set_key,
614 .encrypt = ablk_encrypt,
615 .decrypt = ablk_decrypt,
616 },
617 },
618 } };
619
620 static int __init cast6_init(void)
621 {
622 u64 xcr0;
623
624 if (!cpu_has_avx || !cpu_has_osxsave) {
625 pr_info("AVX instructions are not detected.\n");
626 return -ENODEV;
627 }
628
629 xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
630 if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
631 pr_info("AVX detected but unusable.\n");
632 return -ENODEV;
633 }
634
635 return crypto_register_algs(cast6_algs, ARRAY_SIZE(cast6_algs));
636 }
637
638 static void __exit cast6_exit(void)
639 {
640 crypto_unregister_algs(cast6_algs, ARRAY_SIZE(cast6_algs));
641 }
642
643 module_init(cast6_init);
644 module_exit(cast6_exit);
645
646 MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
647 MODULE_LICENSE("GPL");
648 MODULE_ALIAS("cast6");
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