1 /*
2  * Glue Code for x86_64/AVX2 assembler optimized version of Serpent
3  *
4  * Copyright © 2012-2013 Jussi Kivilinna <jussi.kivilinna@mbnet.fi>
5  *
6  * This program is free software; you can redistribute it and/or modify
7  * it under the terms of the GNU General Public License as published by
8  * the Free Software Foundation; either version 2 of the License, or
9  * (at your option) any later version.
10  *
11  */
12 
13 #include <linux/module.h>
14 #include <linux/types.h>
15 #include <linux/crypto.h>
16 #include <linux/err.h>
17 #include <crypto/algapi.h>
18 #include <crypto/ctr.h>
19 #include <crypto/lrw.h>
20 #include <crypto/xts.h>
21 #include <crypto/serpent.h>
22 #include <asm/xcr.h>
23 #include <asm/xsave.h>
24 #include <asm/crypto/serpent-avx.h>
25 #include <asm/crypto/ablk_helper.h>
26 #include <asm/crypto/glue_helper.h>
27 
28 #define SERPENT_AVX2_PARALLEL_BLOCKS 16
29 
30 /* 16-way AVX2 parallel cipher functions */
31 asmlinkage void serpent_ecb_enc_16way(struct serpent_ctx *ctx, u8 *dst,
32 				      const u8 *src);
33 asmlinkage void serpent_ecb_dec_16way(struct serpent_ctx *ctx, u8 *dst,
34 				      const u8 *src);
35 asmlinkage void serpent_cbc_dec_16way(void *ctx, u128 *dst, const u128 *src);
36 
37 asmlinkage void serpent_ctr_16way(void *ctx, u128 *dst, const u128 *src,
38 				  le128 *iv);
39 asmlinkage void serpent_xts_enc_16way(struct serpent_ctx *ctx, u8 *dst,
40 				      const u8 *src, le128 *iv);
41 asmlinkage void serpent_xts_dec_16way(struct serpent_ctx *ctx, u8 *dst,
42 				      const u8 *src, le128 *iv);
43 
44 static const struct common_glue_ctx serpent_enc = {
45 	.num_funcs = 3,
46 	.fpu_blocks_limit = 8,
47 
48 	.funcs = { {
49 		.num_blocks = 16,
50 		.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_16way) }
51 	}, {
52 		.num_blocks = 8,
53 		.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_enc_8way_avx) }
54 	}, {
55 		.num_blocks = 1,
56 		.fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_encrypt) }
57 	} }
58 };
59 
60 static const struct common_glue_ctx serpent_ctr = {
61 	.num_funcs = 3,
62 	.fpu_blocks_limit = 8,
63 
64 	.funcs = { {
65 		.num_blocks = 16,
66 		.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_16way) }
67 	},  {
68 		.num_blocks = 8,
69 		.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(serpent_ctr_8way_avx) }
70 	}, {
71 		.num_blocks = 1,
72 		.fn_u = { .ctr = GLUE_CTR_FUNC_CAST(__serpent_crypt_ctr) }
73 	} }
74 };
75 
76 static const struct common_glue_ctx serpent_enc_xts = {
77 	.num_funcs = 3,
78 	.fpu_blocks_limit = 8,
79 
80 	.funcs = { {
81 		.num_blocks = 16,
82 		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_16way) }
83 	}, {
84 		.num_blocks = 8,
85 		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc_8way_avx) }
86 	}, {
87 		.num_blocks = 1,
88 		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_enc) }
89 	} }
90 };
91 
92 static const struct common_glue_ctx serpent_dec = {
93 	.num_funcs = 3,
94 	.fpu_blocks_limit = 8,
95 
96 	.funcs = { {
97 		.num_blocks = 16,
98 		.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_16way) }
99 	}, {
100 		.num_blocks = 8,
101 		.fn_u = { .ecb = GLUE_FUNC_CAST(serpent_ecb_dec_8way_avx) }
102 	}, {
103 		.num_blocks = 1,
104 		.fn_u = { .ecb = GLUE_FUNC_CAST(__serpent_decrypt) }
105 	} }
106 };
107 
108 static const struct common_glue_ctx serpent_dec_cbc = {
109 	.num_funcs = 3,
110 	.fpu_blocks_limit = 8,
111 
112 	.funcs = { {
113 		.num_blocks = 16,
114 		.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_16way) }
115 	}, {
116 		.num_blocks = 8,
117 		.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(serpent_cbc_dec_8way_avx) }
118 	}, {
119 		.num_blocks = 1,
120 		.fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__serpent_decrypt) }
121 	} }
122 };
123 
124 static const struct common_glue_ctx serpent_dec_xts = {
125 	.num_funcs = 3,
126 	.fpu_blocks_limit = 8,
127 
128 	.funcs = { {
129 		.num_blocks = 16,
130 		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_16way) }
131 	}, {
132 		.num_blocks = 8,
133 		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec_8way_avx) }
134 	}, {
135 		.num_blocks = 1,
136 		.fn_u = { .xts = GLUE_XTS_FUNC_CAST(serpent_xts_dec) }
137 	} }
138 };
139 
140 static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
141 		       struct scatterlist *src, unsigned int nbytes)
142 {
143 	return glue_ecb_crypt_128bit(&serpent_enc, desc, dst, src, nbytes);
144 }
145 
146 static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
147 		       struct scatterlist *src, unsigned int nbytes)
148 {
149 	return glue_ecb_crypt_128bit(&serpent_dec, desc, dst, src, nbytes);
150 }
151 
152 static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
153 		       struct scatterlist *src, unsigned int nbytes)
154 {
155 	return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(__serpent_encrypt), desc,
156 				       dst, src, nbytes);
157 }
158 
159 static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
160 		       struct scatterlist *src, unsigned int nbytes)
161 {
162 	return glue_cbc_decrypt_128bit(&serpent_dec_cbc, desc, dst, src,
163 				       nbytes);
164 }
165 
166 static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
167 		     struct scatterlist *src, unsigned int nbytes)
168 {
169 	return glue_ctr_crypt_128bit(&serpent_ctr, desc, dst, src, nbytes);
170 }
171 
172 static inline bool serpent_fpu_begin(bool fpu_enabled, unsigned int nbytes)
173 {
174 	/* since reusing AVX functions, starts using FPU at 8 parallel blocks */
175 	return glue_fpu_begin(SERPENT_BLOCK_SIZE, 8, NULL, fpu_enabled, nbytes);
176 }
177 
178 static inline void serpent_fpu_end(bool fpu_enabled)
179 {
180 	glue_fpu_end(fpu_enabled);
181 }
182 
183 struct crypt_priv {
184 	struct serpent_ctx *ctx;
185 	bool fpu_enabled;
186 };
187 
188 static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
189 {
190 	const unsigned int bsize = SERPENT_BLOCK_SIZE;
191 	struct crypt_priv *ctx = priv;
192 	int i;
193 
194 	ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
195 
196 	if (nbytes >= SERPENT_AVX2_PARALLEL_BLOCKS * bsize) {
197 		serpent_ecb_enc_16way(ctx->ctx, srcdst, srcdst);
198 		srcdst += bsize * SERPENT_AVX2_PARALLEL_BLOCKS;
199 		nbytes -= bsize * SERPENT_AVX2_PARALLEL_BLOCKS;
200 	}
201 
202 	while (nbytes >= SERPENT_PARALLEL_BLOCKS * bsize) {
203 		serpent_ecb_enc_8way_avx(ctx->ctx, srcdst, srcdst);
204 		srcdst += bsize * SERPENT_PARALLEL_BLOCKS;
205 		nbytes -= bsize * SERPENT_PARALLEL_BLOCKS;
206 	}
207 
208 	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
209 		__serpent_encrypt(ctx->ctx, srcdst, srcdst);
210 }
211 
212 static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
213 {
214 	const unsigned int bsize = SERPENT_BLOCK_SIZE;
215 	struct crypt_priv *ctx = priv;
216 	int i;
217 
218 	ctx->fpu_enabled = serpent_fpu_begin(ctx->fpu_enabled, nbytes);
219 
220 	if (nbytes >= SERPENT_AVX2_PARALLEL_BLOCKS * bsize) {
221 		serpent_ecb_dec_16way(ctx->ctx, srcdst, srcdst);
222 		srcdst += bsize * SERPENT_AVX2_PARALLEL_BLOCKS;
223 		nbytes -= bsize * SERPENT_AVX2_PARALLEL_BLOCKS;
224 	}
225 
226 	while (nbytes >= SERPENT_PARALLEL_BLOCKS * bsize) {
227 		serpent_ecb_dec_8way_avx(ctx->ctx, srcdst, srcdst);
228 		srcdst += bsize * SERPENT_PARALLEL_BLOCKS;
229 		nbytes -= bsize * SERPENT_PARALLEL_BLOCKS;
230 	}
231 
232 	for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
233 		__serpent_decrypt(ctx->ctx, srcdst, srcdst);
234 }
235 
236 static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
237 		       struct scatterlist *src, unsigned int nbytes)
238 {
239 	struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
240 	be128 buf[SERPENT_AVX2_PARALLEL_BLOCKS];
241 	struct crypt_priv crypt_ctx = {
242 		.ctx = &ctx->serpent_ctx,
243 		.fpu_enabled = false,
244 	};
245 	struct lrw_crypt_req req = {
246 		.tbuf = buf,
247 		.tbuflen = sizeof(buf),
248 
249 		.table_ctx = &ctx->lrw_table,
250 		.crypt_ctx = &crypt_ctx,
251 		.crypt_fn = encrypt_callback,
252 	};
253 	int ret;
254 
255 	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
256 	ret = lrw_crypt(desc, dst, src, nbytes, &req);
257 	serpent_fpu_end(crypt_ctx.fpu_enabled);
258 
259 	return ret;
260 }
261 
262 static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
263 		       struct scatterlist *src, unsigned int nbytes)
264 {
265 	struct serpent_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
266 	be128 buf[SERPENT_AVX2_PARALLEL_BLOCKS];
267 	struct crypt_priv crypt_ctx = {
268 		.ctx = &ctx->serpent_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 = decrypt_callback,
278 	};
279 	int ret;
280 
281 	desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
282 	ret = lrw_crypt(desc, dst, src, nbytes, &req);
283 	serpent_fpu_end(crypt_ctx.fpu_enabled);
284 
285 	return ret;
286 }
287 
288 static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
289 		       struct scatterlist *src, unsigned int nbytes)
290 {
291 	struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
292 
293 	return glue_xts_crypt_128bit(&serpent_enc_xts, desc, dst, src, nbytes,
294 				     XTS_TWEAK_CAST(__serpent_encrypt),
295 				     &ctx->tweak_ctx, &ctx->crypt_ctx);
296 }
297 
298 static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
299 		       struct scatterlist *src, unsigned int nbytes)
300 {
301 	struct serpent_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
302 
303 	return glue_xts_crypt_128bit(&serpent_dec_xts, desc, dst, src, nbytes,
304 				     XTS_TWEAK_CAST(__serpent_encrypt),
305 				     &ctx->tweak_ctx, &ctx->crypt_ctx);
306 }
307 
308 static struct crypto_alg srp_algs[10] = { {
309 	.cra_name		= "__ecb-serpent-avx2",
310 	.cra_driver_name	= "__driver-ecb-serpent-avx2",
311 	.cra_priority		= 0,
312 	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
313 	.cra_blocksize		= SERPENT_BLOCK_SIZE,
314 	.cra_ctxsize		= sizeof(struct serpent_ctx),
315 	.cra_alignmask		= 0,
316 	.cra_type		= &crypto_blkcipher_type,
317 	.cra_module		= THIS_MODULE,
318 	.cra_list		= LIST_HEAD_INIT(srp_algs[0].cra_list),
319 	.cra_u = {
320 		.blkcipher = {
321 			.min_keysize	= SERPENT_MIN_KEY_SIZE,
322 			.max_keysize	= SERPENT_MAX_KEY_SIZE,
323 			.setkey		= serpent_setkey,
324 			.encrypt	= ecb_encrypt,
325 			.decrypt	= ecb_decrypt,
326 		},
327 	},
328 }, {
329 	.cra_name		= "__cbc-serpent-avx2",
330 	.cra_driver_name	= "__driver-cbc-serpent-avx2",
331 	.cra_priority		= 0,
332 	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
333 	.cra_blocksize		= SERPENT_BLOCK_SIZE,
334 	.cra_ctxsize		= sizeof(struct serpent_ctx),
335 	.cra_alignmask		= 0,
336 	.cra_type		= &crypto_blkcipher_type,
337 	.cra_module		= THIS_MODULE,
338 	.cra_list		= LIST_HEAD_INIT(srp_algs[1].cra_list),
339 	.cra_u = {
340 		.blkcipher = {
341 			.min_keysize	= SERPENT_MIN_KEY_SIZE,
342 			.max_keysize	= SERPENT_MAX_KEY_SIZE,
343 			.setkey		= serpent_setkey,
344 			.encrypt	= cbc_encrypt,
345 			.decrypt	= cbc_decrypt,
346 		},
347 	},
348 }, {
349 	.cra_name		= "__ctr-serpent-avx2",
350 	.cra_driver_name	= "__driver-ctr-serpent-avx2",
351 	.cra_priority		= 0,
352 	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
353 	.cra_blocksize		= 1,
354 	.cra_ctxsize		= sizeof(struct serpent_ctx),
355 	.cra_alignmask		= 0,
356 	.cra_type		= &crypto_blkcipher_type,
357 	.cra_module		= THIS_MODULE,
358 	.cra_list		= LIST_HEAD_INIT(srp_algs[2].cra_list),
359 	.cra_u = {
360 		.blkcipher = {
361 			.min_keysize	= SERPENT_MIN_KEY_SIZE,
362 			.max_keysize	= SERPENT_MAX_KEY_SIZE,
363 			.ivsize		= SERPENT_BLOCK_SIZE,
364 			.setkey		= serpent_setkey,
365 			.encrypt	= ctr_crypt,
366 			.decrypt	= ctr_crypt,
367 		},
368 	},
369 }, {
370 	.cra_name		= "__lrw-serpent-avx2",
371 	.cra_driver_name	= "__driver-lrw-serpent-avx2",
372 	.cra_priority		= 0,
373 	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
374 	.cra_blocksize		= SERPENT_BLOCK_SIZE,
375 	.cra_ctxsize		= sizeof(struct serpent_lrw_ctx),
376 	.cra_alignmask		= 0,
377 	.cra_type		= &crypto_blkcipher_type,
378 	.cra_module		= THIS_MODULE,
379 	.cra_list		= LIST_HEAD_INIT(srp_algs[3].cra_list),
380 	.cra_exit		= lrw_serpent_exit_tfm,
381 	.cra_u = {
382 		.blkcipher = {
383 			.min_keysize	= SERPENT_MIN_KEY_SIZE +
384 					  SERPENT_BLOCK_SIZE,
385 			.max_keysize	= SERPENT_MAX_KEY_SIZE +
386 					  SERPENT_BLOCK_SIZE,
387 			.ivsize		= SERPENT_BLOCK_SIZE,
388 			.setkey		= lrw_serpent_setkey,
389 			.encrypt	= lrw_encrypt,
390 			.decrypt	= lrw_decrypt,
391 		},
392 	},
393 }, {
394 	.cra_name		= "__xts-serpent-avx2",
395 	.cra_driver_name	= "__driver-xts-serpent-avx2",
396 	.cra_priority		= 0,
397 	.cra_flags		= CRYPTO_ALG_TYPE_BLKCIPHER,
398 	.cra_blocksize		= SERPENT_BLOCK_SIZE,
399 	.cra_ctxsize		= sizeof(struct serpent_xts_ctx),
400 	.cra_alignmask		= 0,
401 	.cra_type		= &crypto_blkcipher_type,
402 	.cra_module		= THIS_MODULE,
403 	.cra_list		= LIST_HEAD_INIT(srp_algs[4].cra_list),
404 	.cra_u = {
405 		.blkcipher = {
406 			.min_keysize	= SERPENT_MIN_KEY_SIZE * 2,
407 			.max_keysize	= SERPENT_MAX_KEY_SIZE * 2,
408 			.ivsize		= SERPENT_BLOCK_SIZE,
409 			.setkey		= xts_serpent_setkey,
410 			.encrypt	= xts_encrypt,
411 			.decrypt	= xts_decrypt,
412 		},
413 	},
414 }, {
415 	.cra_name		= "ecb(serpent)",
416 	.cra_driver_name	= "ecb-serpent-avx2",
417 	.cra_priority		= 600,
418 	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
419 	.cra_blocksize		= SERPENT_BLOCK_SIZE,
420 	.cra_ctxsize		= sizeof(struct async_helper_ctx),
421 	.cra_alignmask		= 0,
422 	.cra_type		= &crypto_ablkcipher_type,
423 	.cra_module		= THIS_MODULE,
424 	.cra_list		= LIST_HEAD_INIT(srp_algs[5].cra_list),
425 	.cra_init		= ablk_init,
426 	.cra_exit		= ablk_exit,
427 	.cra_u = {
428 		.ablkcipher = {
429 			.min_keysize	= SERPENT_MIN_KEY_SIZE,
430 			.max_keysize	= SERPENT_MAX_KEY_SIZE,
431 			.setkey		= ablk_set_key,
432 			.encrypt	= ablk_encrypt,
433 			.decrypt	= ablk_decrypt,
434 		},
435 	},
436 }, {
437 	.cra_name		= "cbc(serpent)",
438 	.cra_driver_name	= "cbc-serpent-avx2",
439 	.cra_priority		= 600,
440 	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
441 	.cra_blocksize		= SERPENT_BLOCK_SIZE,
442 	.cra_ctxsize		= sizeof(struct async_helper_ctx),
443 	.cra_alignmask		= 0,
444 	.cra_type		= &crypto_ablkcipher_type,
445 	.cra_module		= THIS_MODULE,
446 	.cra_list		= LIST_HEAD_INIT(srp_algs[6].cra_list),
447 	.cra_init		= ablk_init,
448 	.cra_exit		= ablk_exit,
449 	.cra_u = {
450 		.ablkcipher = {
451 			.min_keysize	= SERPENT_MIN_KEY_SIZE,
452 			.max_keysize	= SERPENT_MAX_KEY_SIZE,
453 			.ivsize		= SERPENT_BLOCK_SIZE,
454 			.setkey		= ablk_set_key,
455 			.encrypt	= __ablk_encrypt,
456 			.decrypt	= ablk_decrypt,
457 		},
458 	},
459 }, {
460 	.cra_name		= "ctr(serpent)",
461 	.cra_driver_name	= "ctr-serpent-avx2",
462 	.cra_priority		= 600,
463 	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
464 	.cra_blocksize		= 1,
465 	.cra_ctxsize		= sizeof(struct async_helper_ctx),
466 	.cra_alignmask		= 0,
467 	.cra_type		= &crypto_ablkcipher_type,
468 	.cra_module		= THIS_MODULE,
469 	.cra_list		= LIST_HEAD_INIT(srp_algs[7].cra_list),
470 	.cra_init		= ablk_init,
471 	.cra_exit		= ablk_exit,
472 	.cra_u = {
473 		.ablkcipher = {
474 			.min_keysize	= SERPENT_MIN_KEY_SIZE,
475 			.max_keysize	= SERPENT_MAX_KEY_SIZE,
476 			.ivsize		= SERPENT_BLOCK_SIZE,
477 			.setkey		= ablk_set_key,
478 			.encrypt	= ablk_encrypt,
479 			.decrypt	= ablk_encrypt,
480 			.geniv		= "chainiv",
481 		},
482 	},
483 }, {
484 	.cra_name		= "lrw(serpent)",
485 	.cra_driver_name	= "lrw-serpent-avx2",
486 	.cra_priority		= 600,
487 	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
488 	.cra_blocksize		= SERPENT_BLOCK_SIZE,
489 	.cra_ctxsize		= sizeof(struct async_helper_ctx),
490 	.cra_alignmask		= 0,
491 	.cra_type		= &crypto_ablkcipher_type,
492 	.cra_module		= THIS_MODULE,
493 	.cra_list		= LIST_HEAD_INIT(srp_algs[8].cra_list),
494 	.cra_init		= ablk_init,
495 	.cra_exit		= ablk_exit,
496 	.cra_u = {
497 		.ablkcipher = {
498 			.min_keysize	= SERPENT_MIN_KEY_SIZE +
499 					  SERPENT_BLOCK_SIZE,
500 			.max_keysize	= SERPENT_MAX_KEY_SIZE +
501 					  SERPENT_BLOCK_SIZE,
502 			.ivsize		= SERPENT_BLOCK_SIZE,
503 			.setkey		= ablk_set_key,
504 			.encrypt	= ablk_encrypt,
505 			.decrypt	= ablk_decrypt,
506 		},
507 	},
508 }, {
509 	.cra_name		= "xts(serpent)",
510 	.cra_driver_name	= "xts-serpent-avx2",
511 	.cra_priority		= 600,
512 	.cra_flags		= CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
513 	.cra_blocksize		= SERPENT_BLOCK_SIZE,
514 	.cra_ctxsize		= sizeof(struct async_helper_ctx),
515 	.cra_alignmask		= 0,
516 	.cra_type		= &crypto_ablkcipher_type,
517 	.cra_module		= THIS_MODULE,
518 	.cra_list		= LIST_HEAD_INIT(srp_algs[9].cra_list),
519 	.cra_init		= ablk_init,
520 	.cra_exit		= ablk_exit,
521 	.cra_u = {
522 		.ablkcipher = {
523 			.min_keysize	= SERPENT_MIN_KEY_SIZE * 2,
524 			.max_keysize	= SERPENT_MAX_KEY_SIZE * 2,
525 			.ivsize		= SERPENT_BLOCK_SIZE,
526 			.setkey		= ablk_set_key,
527 			.encrypt	= ablk_encrypt,
528 			.decrypt	= ablk_decrypt,
529 		},
530 	},
531 } };
532 
533 static int __init init(void)
534 {
535 	u64 xcr0;
536 
537 	if (!cpu_has_avx2 || !cpu_has_osxsave) {
538 		pr_info("AVX2 instructions are not detected.\n");
539 		return -ENODEV;
540 	}
541 
542 	xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
543 	if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
544 		pr_info("AVX detected but unusable.\n");
545 		return -ENODEV;
546 	}
547 
548 	return crypto_register_algs(srp_algs, ARRAY_SIZE(srp_algs));
549 }
550 
551 static void __exit fini(void)
552 {
553 	crypto_unregister_algs(srp_algs, ARRAY_SIZE(srp_algs));
554 }
555 
556 module_init(init);
557 module_exit(fini);
558 
559 MODULE_LICENSE("GPL");
560 MODULE_DESCRIPTION("Serpent Cipher Algorithm, AVX2 optimized");
561 MODULE_ALIAS("serpent");
562 MODULE_ALIAS("serpent-asm");
563