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26#include <linux/module.h>
27#include <linux/hardirq.h>
28#include <linux/types.h>
29#include <linux/crypto.h>
30#include <linux/err.h>
31#include <crypto/ablk_helper.h>
32#include <crypto/algapi.h>
33#include <crypto/cast6.h>
34#include <crypto/cryptd.h>
35#include <crypto/b128ops.h>
36#include <crypto/ctr.h>
37#include <crypto/lrw.h>
38#include <crypto/xts.h>
39#include <asm/xcr.h>
40#include <asm/xsave.h>
41#include <asm/crypto/glue_helper.h>
42
43#define CAST6_PARALLEL_BLOCKS 8
44
45asmlinkage void cast6_ecb_enc_8way(struct cast6_ctx *ctx, u8 *dst,
46 const u8 *src);
47asmlinkage void cast6_ecb_dec_8way(struct cast6_ctx *ctx, u8 *dst,
48 const u8 *src);
49
50asmlinkage void cast6_cbc_dec_8way(struct cast6_ctx *ctx, u8 *dst,
51 const u8 *src);
52asmlinkage void cast6_ctr_8way(struct cast6_ctx *ctx, u8 *dst, const u8 *src,
53 le128 *iv);
54
55asmlinkage void cast6_xts_enc_8way(struct cast6_ctx *ctx, u8 *dst,
56 const u8 *src, le128 *iv);
57asmlinkage void cast6_xts_dec_8way(struct cast6_ctx *ctx, u8 *dst,
58 const u8 *src, le128 *iv);
59
60static void cast6_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv)
61{
62 glue_xts_crypt_128bit_one(ctx, dst, src, iv,
63 GLUE_FUNC_CAST(__cast6_encrypt));
64}
65
66static void cast6_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv)
67{
68 glue_xts_crypt_128bit_one(ctx, dst, src, iv,
69 GLUE_FUNC_CAST(__cast6_decrypt));
70}
71
72static void cast6_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
73{
74 be128 ctrblk;
75
76 le128_to_be128(&ctrblk, iv);
77 le128_inc(iv);
78
79 __cast6_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
80 u128_xor(dst, src, (u128 *)&ctrblk);
81}
82
83static const struct common_glue_ctx cast6_enc = {
84 .num_funcs = 2,
85 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
86
87 .funcs = { {
88 .num_blocks = CAST6_PARALLEL_BLOCKS,
89 .fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_enc_8way) }
90 }, {
91 .num_blocks = 1,
92 .fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_encrypt) }
93 } }
94};
95
96static const struct common_glue_ctx cast6_ctr = {
97 .num_funcs = 2,
98 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
99
100 .funcs = { {
101 .num_blocks = CAST6_PARALLEL_BLOCKS,
102 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_ctr_8way) }
103 }, {
104 .num_blocks = 1,
105 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_crypt_ctr) }
106 } }
107};
108
109static const struct common_glue_ctx cast6_enc_xts = {
110 .num_funcs = 2,
111 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
112
113 .funcs = { {
114 .num_blocks = CAST6_PARALLEL_BLOCKS,
115 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc_8way) }
116 }, {
117 .num_blocks = 1,
118 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc) }
119 } }
120};
121
122static const struct common_glue_ctx cast6_dec = {
123 .num_funcs = 2,
124 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
125
126 .funcs = { {
127 .num_blocks = CAST6_PARALLEL_BLOCKS,
128 .fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_dec_8way) }
129 }, {
130 .num_blocks = 1,
131 .fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_decrypt) }
132 } }
133};
134
135static const struct common_glue_ctx cast6_dec_cbc = {
136 .num_funcs = 2,
137 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
138
139 .funcs = { {
140 .num_blocks = CAST6_PARALLEL_BLOCKS,
141 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(cast6_cbc_dec_8way) }
142 }, {
143 .num_blocks = 1,
144 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__cast6_decrypt) }
145 } }
146};
147
148static const struct common_glue_ctx cast6_dec_xts = {
149 .num_funcs = 2,
150 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
151
152 .funcs = { {
153 .num_blocks = CAST6_PARALLEL_BLOCKS,
154 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec_8way) }
155 }, {
156 .num_blocks = 1,
157 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec) }
158 } }
159};
160
161static 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
167static 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
173static 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
180static 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
187static 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
193static 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
199static inline void cast6_fpu_end(bool fpu_enabled)
200{
201 glue_fpu_end(fpu_enabled);
202}
203
204struct crypt_priv {
205 struct cast6_ctx *ctx;
206 bool fpu_enabled;
207};
208
209static 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_ecb_enc_8way(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
226static 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_ecb_dec_8way(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
243struct cast6_lrw_ctx {
244 struct lrw_table_ctx lrw_table;
245 struct cast6_ctx cast6_ctx;
246};
247
248static 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
262static 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
288static 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
314static 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
321struct cast6_xts_ctx {
322 struct cast6_ctx tweak_ctx;
323 struct cast6_ctx crypt_ctx;
324};
325
326static 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
334
335
336 if (keylen % 2) {
337 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
338 return -EINVAL;
339 }
340
341
342 err = __cast6_setkey(&ctx->crypt_ctx, key, keylen / 2, flags);
343 if (err)
344 return err;
345
346
347 return __cast6_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2,
348 flags);
349}
350
351static 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
356 return glue_xts_crypt_128bit(&cast6_enc_xts, desc, dst, src, nbytes,
357 XTS_TWEAK_CAST(__cast6_encrypt),
358 &ctx->tweak_ctx, &ctx->crypt_ctx);
359}
360
361static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
362 struct scatterlist *src, unsigned int nbytes)
363{
364 struct cast6_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
365
366 return glue_xts_crypt_128bit(&cast6_dec_xts, desc, dst, src, nbytes,
367 XTS_TWEAK_CAST(__cast6_encrypt),
368 &ctx->tweak_ctx, &ctx->crypt_ctx);
369}
370
371static struct crypto_alg cast6_algs[10] = { {
372 .cra_name = "__ecb-cast6-avx",
373 .cra_driver_name = "__driver-ecb-cast6-avx",
374 .cra_priority = 0,
375 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
376 .cra_blocksize = CAST6_BLOCK_SIZE,
377 .cra_ctxsize = sizeof(struct cast6_ctx),
378 .cra_alignmask = 0,
379 .cra_type = &crypto_blkcipher_type,
380 .cra_module = THIS_MODULE,
381 .cra_u = {
382 .blkcipher = {
383 .min_keysize = CAST6_MIN_KEY_SIZE,
384 .max_keysize = CAST6_MAX_KEY_SIZE,
385 .setkey = cast6_setkey,
386 .encrypt = ecb_encrypt,
387 .decrypt = ecb_decrypt,
388 },
389 },
390}, {
391 .cra_name = "__cbc-cast6-avx",
392 .cra_driver_name = "__driver-cbc-cast6-avx",
393 .cra_priority = 0,
394 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
395 .cra_blocksize = CAST6_BLOCK_SIZE,
396 .cra_ctxsize = sizeof(struct cast6_ctx),
397 .cra_alignmask = 0,
398 .cra_type = &crypto_blkcipher_type,
399 .cra_module = THIS_MODULE,
400 .cra_u = {
401 .blkcipher = {
402 .min_keysize = CAST6_MIN_KEY_SIZE,
403 .max_keysize = CAST6_MAX_KEY_SIZE,
404 .setkey = cast6_setkey,
405 .encrypt = cbc_encrypt,
406 .decrypt = cbc_decrypt,
407 },
408 },
409}, {
410 .cra_name = "__ctr-cast6-avx",
411 .cra_driver_name = "__driver-ctr-cast6-avx",
412 .cra_priority = 0,
413 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
414 .cra_blocksize = 1,
415 .cra_ctxsize = sizeof(struct cast6_ctx),
416 .cra_alignmask = 0,
417 .cra_type = &crypto_blkcipher_type,
418 .cra_module = THIS_MODULE,
419 .cra_u = {
420 .blkcipher = {
421 .min_keysize = CAST6_MIN_KEY_SIZE,
422 .max_keysize = CAST6_MAX_KEY_SIZE,
423 .ivsize = CAST6_BLOCK_SIZE,
424 .setkey = cast6_setkey,
425 .encrypt = ctr_crypt,
426 .decrypt = ctr_crypt,
427 },
428 },
429}, {
430 .cra_name = "__lrw-cast6-avx",
431 .cra_driver_name = "__driver-lrw-cast6-avx",
432 .cra_priority = 0,
433 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
434 .cra_blocksize = CAST6_BLOCK_SIZE,
435 .cra_ctxsize = sizeof(struct cast6_lrw_ctx),
436 .cra_alignmask = 0,
437 .cra_type = &crypto_blkcipher_type,
438 .cra_module = THIS_MODULE,
439 .cra_exit = lrw_exit_tfm,
440 .cra_u = {
441 .blkcipher = {
442 .min_keysize = CAST6_MIN_KEY_SIZE +
443 CAST6_BLOCK_SIZE,
444 .max_keysize = CAST6_MAX_KEY_SIZE +
445 CAST6_BLOCK_SIZE,
446 .ivsize = CAST6_BLOCK_SIZE,
447 .setkey = lrw_cast6_setkey,
448 .encrypt = lrw_encrypt,
449 .decrypt = lrw_decrypt,
450 },
451 },
452}, {
453 .cra_name = "__xts-cast6-avx",
454 .cra_driver_name = "__driver-xts-cast6-avx",
455 .cra_priority = 0,
456 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
457 .cra_blocksize = CAST6_BLOCK_SIZE,
458 .cra_ctxsize = sizeof(struct cast6_xts_ctx),
459 .cra_alignmask = 0,
460 .cra_type = &crypto_blkcipher_type,
461 .cra_module = THIS_MODULE,
462 .cra_u = {
463 .blkcipher = {
464 .min_keysize = CAST6_MIN_KEY_SIZE * 2,
465 .max_keysize = CAST6_MAX_KEY_SIZE * 2,
466 .ivsize = CAST6_BLOCK_SIZE,
467 .setkey = xts_cast6_setkey,
468 .encrypt = xts_encrypt,
469 .decrypt = xts_decrypt,
470 },
471 },
472}, {
473 .cra_name = "ecb(cast6)",
474 .cra_driver_name = "ecb-cast6-avx",
475 .cra_priority = 200,
476 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
477 .cra_blocksize = CAST6_BLOCK_SIZE,
478 .cra_ctxsize = sizeof(struct async_helper_ctx),
479 .cra_alignmask = 0,
480 .cra_type = &crypto_ablkcipher_type,
481 .cra_module = THIS_MODULE,
482 .cra_init = ablk_init,
483 .cra_exit = ablk_exit,
484 .cra_u = {
485 .ablkcipher = {
486 .min_keysize = CAST6_MIN_KEY_SIZE,
487 .max_keysize = CAST6_MAX_KEY_SIZE,
488 .setkey = ablk_set_key,
489 .encrypt = ablk_encrypt,
490 .decrypt = ablk_decrypt,
491 },
492 },
493}, {
494 .cra_name = "cbc(cast6)",
495 .cra_driver_name = "cbc-cast6-avx",
496 .cra_priority = 200,
497 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
498 .cra_blocksize = CAST6_BLOCK_SIZE,
499 .cra_ctxsize = sizeof(struct async_helper_ctx),
500 .cra_alignmask = 0,
501 .cra_type = &crypto_ablkcipher_type,
502 .cra_module = THIS_MODULE,
503 .cra_init = ablk_init,
504 .cra_exit = ablk_exit,
505 .cra_u = {
506 .ablkcipher = {
507 .min_keysize = CAST6_MIN_KEY_SIZE,
508 .max_keysize = CAST6_MAX_KEY_SIZE,
509 .ivsize = CAST6_BLOCK_SIZE,
510 .setkey = ablk_set_key,
511 .encrypt = __ablk_encrypt,
512 .decrypt = ablk_decrypt,
513 },
514 },
515}, {
516 .cra_name = "ctr(cast6)",
517 .cra_driver_name = "ctr-cast6-avx",
518 .cra_priority = 200,
519 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
520 .cra_blocksize = 1,
521 .cra_ctxsize = sizeof(struct async_helper_ctx),
522 .cra_alignmask = 0,
523 .cra_type = &crypto_ablkcipher_type,
524 .cra_module = THIS_MODULE,
525 .cra_init = ablk_init,
526 .cra_exit = ablk_exit,
527 .cra_u = {
528 .ablkcipher = {
529 .min_keysize = CAST6_MIN_KEY_SIZE,
530 .max_keysize = CAST6_MAX_KEY_SIZE,
531 .ivsize = CAST6_BLOCK_SIZE,
532 .setkey = ablk_set_key,
533 .encrypt = ablk_encrypt,
534 .decrypt = ablk_encrypt,
535 .geniv = "chainiv",
536 },
537 },
538}, {
539 .cra_name = "lrw(cast6)",
540 .cra_driver_name = "lrw-cast6-avx",
541 .cra_priority = 200,
542 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
543 .cra_blocksize = CAST6_BLOCK_SIZE,
544 .cra_ctxsize = sizeof(struct async_helper_ctx),
545 .cra_alignmask = 0,
546 .cra_type = &crypto_ablkcipher_type,
547 .cra_module = THIS_MODULE,
548 .cra_init = ablk_init,
549 .cra_exit = ablk_exit,
550 .cra_u = {
551 .ablkcipher = {
552 .min_keysize = CAST6_MIN_KEY_SIZE +
553 CAST6_BLOCK_SIZE,
554 .max_keysize = CAST6_MAX_KEY_SIZE +
555 CAST6_BLOCK_SIZE,
556 .ivsize = CAST6_BLOCK_SIZE,
557 .setkey = ablk_set_key,
558 .encrypt = ablk_encrypt,
559 .decrypt = ablk_decrypt,
560 },
561 },
562}, {
563 .cra_name = "xts(cast6)",
564 .cra_driver_name = "xts-cast6-avx",
565 .cra_priority = 200,
566 .cra_flags = CRYPTO_ALG_TYPE_ABLKCIPHER | CRYPTO_ALG_ASYNC,
567 .cra_blocksize = CAST6_BLOCK_SIZE,
568 .cra_ctxsize = sizeof(struct async_helper_ctx),
569 .cra_alignmask = 0,
570 .cra_type = &crypto_ablkcipher_type,
571 .cra_module = THIS_MODULE,
572 .cra_init = ablk_init,
573 .cra_exit = ablk_exit,
574 .cra_u = {
575 .ablkcipher = {
576 .min_keysize = CAST6_MIN_KEY_SIZE * 2,
577 .max_keysize = CAST6_MAX_KEY_SIZE * 2,
578 .ivsize = CAST6_BLOCK_SIZE,
579 .setkey = ablk_set_key,
580 .encrypt = ablk_encrypt,
581 .decrypt = ablk_decrypt,
582 },
583 },
584} };
585
586static int __init cast6_init(void)
587{
588 u64 xcr0;
589
590 if (!cpu_has_avx || !cpu_has_osxsave) {
591 pr_info("AVX instructions are not detected.\n");
592 return -ENODEV;
593 }
594
595 xcr0 = xgetbv(XCR_XFEATURE_ENABLED_MASK);
596 if ((xcr0 & (XSTATE_SSE | XSTATE_YMM)) != (XSTATE_SSE | XSTATE_YMM)) {
597 pr_info("AVX detected but unusable.\n");
598 return -ENODEV;
599 }
600
601 return crypto_register_algs(cast6_algs, ARRAY_SIZE(cast6_algs));
602}
603
604static void __exit cast6_exit(void)
605{
606 crypto_unregister_algs(cast6_algs, ARRAY_SIZE(cast6_algs));
607}
608
609module_init(cast6_init);
610module_exit(cast6_exit);
611
612MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
613MODULE_LICENSE("GPL");
614MODULE_ALIAS("cast6");
615
