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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/fpu/api.h>
40#include <asm/crypto/glue_helper.h>
41
42#define CAST6_PARALLEL_BLOCKS 8
43
44asmlinkage void cast6_ecb_enc_8way(struct cast6_ctx *ctx, u8 *dst,
45 const u8 *src);
46asmlinkage void cast6_ecb_dec_8way(struct cast6_ctx *ctx, u8 *dst,
47 const u8 *src);
48
49asmlinkage void cast6_cbc_dec_8way(struct cast6_ctx *ctx, u8 *dst,
50 const u8 *src);
51asmlinkage void cast6_ctr_8way(struct cast6_ctx *ctx, u8 *dst, const u8 *src,
52 le128 *iv);
53
54asmlinkage void cast6_xts_enc_8way(struct cast6_ctx *ctx, u8 *dst,
55 const u8 *src, le128 *iv);
56asmlinkage void cast6_xts_dec_8way(struct cast6_ctx *ctx, u8 *dst,
57 const u8 *src, le128 *iv);
58
59static void cast6_xts_enc(void *ctx, u128 *dst, const u128 *src, le128 *iv)
60{
61 glue_xts_crypt_128bit_one(ctx, dst, src, iv,
62 GLUE_FUNC_CAST(__cast6_encrypt));
63}
64
65static void cast6_xts_dec(void *ctx, u128 *dst, const u128 *src, le128 *iv)
66{
67 glue_xts_crypt_128bit_one(ctx, dst, src, iv,
68 GLUE_FUNC_CAST(__cast6_decrypt));
69}
70
71static void cast6_crypt_ctr(void *ctx, u128 *dst, const u128 *src, le128 *iv)
72{
73 be128 ctrblk;
74
75 le128_to_be128(&ctrblk, iv);
76 le128_inc(iv);
77
78 __cast6_encrypt(ctx, (u8 *)&ctrblk, (u8 *)&ctrblk);
79 u128_xor(dst, src, (u128 *)&ctrblk);
80}
81
82static const struct common_glue_ctx cast6_enc = {
83 .num_funcs = 2,
84 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
85
86 .funcs = { {
87 .num_blocks = CAST6_PARALLEL_BLOCKS,
88 .fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_enc_8way) }
89 }, {
90 .num_blocks = 1,
91 .fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_encrypt) }
92 } }
93};
94
95static const struct common_glue_ctx cast6_ctr = {
96 .num_funcs = 2,
97 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
98
99 .funcs = { {
100 .num_blocks = CAST6_PARALLEL_BLOCKS,
101 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_ctr_8way) }
102 }, {
103 .num_blocks = 1,
104 .fn_u = { .ctr = GLUE_CTR_FUNC_CAST(cast6_crypt_ctr) }
105 } }
106};
107
108static const struct common_glue_ctx cast6_enc_xts = {
109 .num_funcs = 2,
110 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
111
112 .funcs = { {
113 .num_blocks = CAST6_PARALLEL_BLOCKS,
114 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc_8way) }
115 }, {
116 .num_blocks = 1,
117 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_enc) }
118 } }
119};
120
121static const struct common_glue_ctx cast6_dec = {
122 .num_funcs = 2,
123 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
124
125 .funcs = { {
126 .num_blocks = CAST6_PARALLEL_BLOCKS,
127 .fn_u = { .ecb = GLUE_FUNC_CAST(cast6_ecb_dec_8way) }
128 }, {
129 .num_blocks = 1,
130 .fn_u = { .ecb = GLUE_FUNC_CAST(__cast6_decrypt) }
131 } }
132};
133
134static const struct common_glue_ctx cast6_dec_cbc = {
135 .num_funcs = 2,
136 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
137
138 .funcs = { {
139 .num_blocks = CAST6_PARALLEL_BLOCKS,
140 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(cast6_cbc_dec_8way) }
141 }, {
142 .num_blocks = 1,
143 .fn_u = { .cbc = GLUE_CBC_FUNC_CAST(__cast6_decrypt) }
144 } }
145};
146
147static const struct common_glue_ctx cast6_dec_xts = {
148 .num_funcs = 2,
149 .fpu_blocks_limit = CAST6_PARALLEL_BLOCKS,
150
151 .funcs = { {
152 .num_blocks = CAST6_PARALLEL_BLOCKS,
153 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec_8way) }
154 }, {
155 .num_blocks = 1,
156 .fn_u = { .xts = GLUE_XTS_FUNC_CAST(cast6_xts_dec) }
157 } }
158};
159
160static int ecb_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
161 struct scatterlist *src, unsigned int nbytes)
162{
163 return glue_ecb_crypt_128bit(&cast6_enc, desc, dst, src, nbytes);
164}
165
166static int ecb_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
167 struct scatterlist *src, unsigned int nbytes)
168{
169 return glue_ecb_crypt_128bit(&cast6_dec, desc, dst, src, nbytes);
170}
171
172static int cbc_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
173 struct scatterlist *src, unsigned int nbytes)
174{
175 return glue_cbc_encrypt_128bit(GLUE_FUNC_CAST(__cast6_encrypt), desc,
176 dst, src, nbytes);
177}
178
179static int cbc_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
180 struct scatterlist *src, unsigned int nbytes)
181{
182 return glue_cbc_decrypt_128bit(&cast6_dec_cbc, desc, dst, src,
183 nbytes);
184}
185
186static int ctr_crypt(struct blkcipher_desc *desc, struct scatterlist *dst,
187 struct scatterlist *src, unsigned int nbytes)
188{
189 return glue_ctr_crypt_128bit(&cast6_ctr, desc, dst, src, nbytes);
190}
191
192static inline bool cast6_fpu_begin(bool fpu_enabled, unsigned int nbytes)
193{
194 return glue_fpu_begin(CAST6_BLOCK_SIZE, CAST6_PARALLEL_BLOCKS,
195 NULL, fpu_enabled, nbytes);
196}
197
198static inline void cast6_fpu_end(bool fpu_enabled)
199{
200 glue_fpu_end(fpu_enabled);
201}
202
203struct crypt_priv {
204 struct cast6_ctx *ctx;
205 bool fpu_enabled;
206};
207
208static void encrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
209{
210 const unsigned int bsize = CAST6_BLOCK_SIZE;
211 struct crypt_priv *ctx = priv;
212 int i;
213
214 ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes);
215
216 if (nbytes == bsize * CAST6_PARALLEL_BLOCKS) {
217 cast6_ecb_enc_8way(ctx->ctx, srcdst, srcdst);
218 return;
219 }
220
221 for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
222 __cast6_encrypt(ctx->ctx, srcdst, srcdst);
223}
224
225static void decrypt_callback(void *priv, u8 *srcdst, unsigned int nbytes)
226{
227 const unsigned int bsize = CAST6_BLOCK_SIZE;
228 struct crypt_priv *ctx = priv;
229 int i;
230
231 ctx->fpu_enabled = cast6_fpu_begin(ctx->fpu_enabled, nbytes);
232
233 if (nbytes == bsize * CAST6_PARALLEL_BLOCKS) {
234 cast6_ecb_dec_8way(ctx->ctx, srcdst, srcdst);
235 return;
236 }
237
238 for (i = 0; i < nbytes / bsize; i++, srcdst += bsize)
239 __cast6_decrypt(ctx->ctx, srcdst, srcdst);
240}
241
242struct cast6_lrw_ctx {
243 struct lrw_table_ctx lrw_table;
244 struct cast6_ctx cast6_ctx;
245};
246
247static int lrw_cast6_setkey(struct crypto_tfm *tfm, const u8 *key,
248 unsigned int keylen)
249{
250 struct cast6_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
251 int err;
252
253 err = __cast6_setkey(&ctx->cast6_ctx, key, keylen - CAST6_BLOCK_SIZE,
254 &tfm->crt_flags);
255 if (err)
256 return err;
257
258 return lrw_init_table(&ctx->lrw_table, key + keylen - CAST6_BLOCK_SIZE);
259}
260
261static int lrw_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
262 struct scatterlist *src, unsigned int nbytes)
263{
264 struct cast6_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
265 be128 buf[CAST6_PARALLEL_BLOCKS];
266 struct crypt_priv crypt_ctx = {
267 .ctx = &ctx->cast6_ctx,
268 .fpu_enabled = false,
269 };
270 struct lrw_crypt_req req = {
271 .tbuf = buf,
272 .tbuflen = sizeof(buf),
273
274 .table_ctx = &ctx->lrw_table,
275 .crypt_ctx = &crypt_ctx,
276 .crypt_fn = encrypt_callback,
277 };
278 int ret;
279
280 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
281 ret = lrw_crypt(desc, dst, src, nbytes, &req);
282 cast6_fpu_end(crypt_ctx.fpu_enabled);
283
284 return ret;
285}
286
287static int lrw_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
288 struct scatterlist *src, unsigned int nbytes)
289{
290 struct cast6_lrw_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
291 be128 buf[CAST6_PARALLEL_BLOCKS];
292 struct crypt_priv crypt_ctx = {
293 .ctx = &ctx->cast6_ctx,
294 .fpu_enabled = false,
295 };
296 struct lrw_crypt_req req = {
297 .tbuf = buf,
298 .tbuflen = sizeof(buf),
299
300 .table_ctx = &ctx->lrw_table,
301 .crypt_ctx = &crypt_ctx,
302 .crypt_fn = decrypt_callback,
303 };
304 int ret;
305
306 desc->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP;
307 ret = lrw_crypt(desc, dst, src, nbytes, &req);
308 cast6_fpu_end(crypt_ctx.fpu_enabled);
309
310 return ret;
311}
312
313static void lrw_exit_tfm(struct crypto_tfm *tfm)
314{
315 struct cast6_lrw_ctx *ctx = crypto_tfm_ctx(tfm);
316
317 lrw_free_table(&ctx->lrw_table);
318}
319
320struct cast6_xts_ctx {
321 struct cast6_ctx tweak_ctx;
322 struct cast6_ctx crypt_ctx;
323};
324
325static int xts_cast6_setkey(struct crypto_tfm *tfm, const u8 *key,
326 unsigned int keylen)
327{
328 struct cast6_xts_ctx *ctx = crypto_tfm_ctx(tfm);
329 u32 *flags = &tfm->crt_flags;
330 int err;
331
332 err = xts_check_key(tfm, key, keylen);
333 if (err)
334 return err;
335
336
337 err = __cast6_setkey(&ctx->crypt_ctx, key, keylen / 2, flags);
338 if (err)
339 return err;
340
341
342 return __cast6_setkey(&ctx->tweak_ctx, key + keylen / 2, keylen / 2,
343 flags);
344}
345
346static int xts_encrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
347 struct scatterlist *src, unsigned int nbytes)
348{
349 struct cast6_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
350
351 return glue_xts_crypt_128bit(&cast6_enc_xts, desc, dst, src, nbytes,
352 XTS_TWEAK_CAST(__cast6_encrypt),
353 &ctx->tweak_ctx, &ctx->crypt_ctx);
354}
355
356static int xts_decrypt(struct blkcipher_desc *desc, struct scatterlist *dst,
357 struct scatterlist *src, unsigned int nbytes)
358{
359 struct cast6_xts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
360
361 return glue_xts_crypt_128bit(&cast6_dec_xts, desc, dst, src, nbytes,
362 XTS_TWEAK_CAST(__cast6_encrypt),
363 &ctx->tweak_ctx, &ctx->crypt_ctx);
364}
365
366static struct crypto_alg cast6_algs[10] = { {
367 .cra_name = "__ecb-cast6-avx",
368 .cra_driver_name = "__driver-ecb-cast6-avx",
369 .cra_priority = 0,
370 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
371 CRYPTO_ALG_INTERNAL,
372 .cra_blocksize = CAST6_BLOCK_SIZE,
373 .cra_ctxsize = sizeof(struct cast6_ctx),
374 .cra_alignmask = 0,
375 .cra_type = &crypto_blkcipher_type,
376 .cra_module = THIS_MODULE,
377 .cra_u = {
378 .blkcipher = {
379 .min_keysize = CAST6_MIN_KEY_SIZE,
380 .max_keysize = CAST6_MAX_KEY_SIZE,
381 .setkey = cast6_setkey,
382 .encrypt = ecb_encrypt,
383 .decrypt = ecb_decrypt,
384 },
385 },
386}, {
387 .cra_name = "__cbc-cast6-avx",
388 .cra_driver_name = "__driver-cbc-cast6-avx",
389 .cra_priority = 0,
390 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
391 CRYPTO_ALG_INTERNAL,
392 .cra_blocksize = CAST6_BLOCK_SIZE,
393 .cra_ctxsize = sizeof(struct cast6_ctx),
394 .cra_alignmask = 0,
395 .cra_type = &crypto_blkcipher_type,
396 .cra_module = THIS_MODULE,
397 .cra_u = {
398 .blkcipher = {
399 .min_keysize = CAST6_MIN_KEY_SIZE,
400 .max_keysize = CAST6_MAX_KEY_SIZE,
401 .setkey = cast6_setkey,
402 .encrypt = cbc_encrypt,
403 .decrypt = cbc_decrypt,
404 },
405 },
406}, {
407 .cra_name = "__ctr-cast6-avx",
408 .cra_driver_name = "__driver-ctr-cast6-avx",
409 .cra_priority = 0,
410 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
411 CRYPTO_ALG_INTERNAL,
412 .cra_blocksize = 1,
413 .cra_ctxsize = sizeof(struct cast6_ctx),
414 .cra_alignmask = 0,
415 .cra_type = &crypto_blkcipher_type,
416 .cra_module = THIS_MODULE,
417 .cra_u = {
418 .blkcipher = {
419 .min_keysize = CAST6_MIN_KEY_SIZE,
420 .max_keysize = CAST6_MAX_KEY_SIZE,
421 .ivsize = CAST6_BLOCK_SIZE,
422 .setkey = cast6_setkey,
423 .encrypt = ctr_crypt,
424 .decrypt = ctr_crypt,
425 },
426 },
427}, {
428 .cra_name = "__lrw-cast6-avx",
429 .cra_driver_name = "__driver-lrw-cast6-avx",
430 .cra_priority = 0,
431 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
432 CRYPTO_ALG_INTERNAL,
433 .cra_blocksize = CAST6_BLOCK_SIZE,
434 .cra_ctxsize = sizeof(struct cast6_lrw_ctx),
435 .cra_alignmask = 0,
436 .cra_type = &crypto_blkcipher_type,
437 .cra_module = THIS_MODULE,
438 .cra_exit = lrw_exit_tfm,
439 .cra_u = {
440 .blkcipher = {
441 .min_keysize = CAST6_MIN_KEY_SIZE +
442 CAST6_BLOCK_SIZE,
443 .max_keysize = CAST6_MAX_KEY_SIZE +
444 CAST6_BLOCK_SIZE,
445 .ivsize = CAST6_BLOCK_SIZE,
446 .setkey = lrw_cast6_setkey,
447 .encrypt = lrw_encrypt,
448 .decrypt = lrw_decrypt,
449 },
450 },
451}, {
452 .cra_name = "__xts-cast6-avx",
453 .cra_driver_name = "__driver-xts-cast6-avx",
454 .cra_priority = 0,
455 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
456 CRYPTO_ALG_INTERNAL,
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 const char *feature_name;
589
590 if (!cpu_has_xfeatures(XFEATURE_MASK_SSE | XFEATURE_MASK_YMM,
591 &feature_name)) {
592 pr_info("CPU feature '%s' is not supported.\n", feature_name);
593 return -ENODEV;
594 }
595
596 return crypto_register_algs(cast6_algs, ARRAY_SIZE(cast6_algs));
597}
598
599static void __exit cast6_exit(void)
600{
601 crypto_unregister_algs(cast6_algs, ARRAY_SIZE(cast6_algs));
602}
603
604module_init(cast6_init);
605module_exit(cast6_exit);
606
607MODULE_DESCRIPTION("Cast6 Cipher Algorithm, AVX optimized");
608MODULE_LICENSE("GPL");
609MODULE_ALIAS_CRYPTO("cast6");
610
