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crypto: prefix module autoloading with "crypto-"
[deliverable/linux.git] / arch / s390 / crypto / aes_s390.c
1 /*
2 * Cryptographic API.
3 *
4 * s390 implementation of the AES Cipher Algorithm.
5 *
6 * s390 Version:
7 * Copyright IBM Corp. 2005, 2007
8 * Author(s): Jan Glauber (jang@de.ibm.com)
9 * Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback
10 *
11 * Derived from "crypto/aes_generic.c"
12 *
13 * This program is free software; you can redistribute it and/or modify it
14 * under the terms of the GNU General Public License as published by the Free
15 * Software Foundation; either version 2 of the License, or (at your option)
16 * any later version.
17 *
18 */
19
20 #define KMSG_COMPONENT "aes_s390"
21 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
22
23 #include <crypto/aes.h>
24 #include <crypto/algapi.h>
25 #include <linux/err.h>
26 #include <linux/module.h>
27 #include <linux/init.h>
28 #include <linux/spinlock.h>
29 #include "crypt_s390.h"
30
31 #define AES_KEYLEN_128 1
32 #define AES_KEYLEN_192 2
33 #define AES_KEYLEN_256 4
34
35 static u8 *ctrblk;
36 static DEFINE_SPINLOCK(ctrblk_lock);
37 static char keylen_flag;
38
39 struct s390_aes_ctx {
40 u8 key[AES_MAX_KEY_SIZE];
41 long enc;
42 long dec;
43 int key_len;
44 union {
45 struct crypto_blkcipher *blk;
46 struct crypto_cipher *cip;
47 } fallback;
48 };
49
50 struct pcc_param {
51 u8 key[32];
52 u8 tweak[16];
53 u8 block[16];
54 u8 bit[16];
55 u8 xts[16];
56 };
57
58 struct s390_xts_ctx {
59 u8 key[32];
60 u8 pcc_key[32];
61 long enc;
62 long dec;
63 int key_len;
64 struct crypto_blkcipher *fallback;
65 };
66
67 /*
68 * Check if the key_len is supported by the HW.
69 * Returns 0 if it is, a positive number if it is not and software fallback is
70 * required or a negative number in case the key size is not valid
71 */
72 static int need_fallback(unsigned int key_len)
73 {
74 switch (key_len) {
75 case 16:
76 if (!(keylen_flag & AES_KEYLEN_128))
77 return 1;
78 break;
79 case 24:
80 if (!(keylen_flag & AES_KEYLEN_192))
81 return 1;
82 break;
83 case 32:
84 if (!(keylen_flag & AES_KEYLEN_256))
85 return 1;
86 break;
87 default:
88 return -1;
89 break;
90 }
91 return 0;
92 }
93
94 static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key,
95 unsigned int key_len)
96 {
97 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
98 int ret;
99
100 sctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
101 sctx->fallback.cip->base.crt_flags |= (tfm->crt_flags &
102 CRYPTO_TFM_REQ_MASK);
103
104 ret = crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len);
105 if (ret) {
106 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
107 tfm->crt_flags |= (sctx->fallback.cip->base.crt_flags &
108 CRYPTO_TFM_RES_MASK);
109 }
110 return ret;
111 }
112
113 static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
114 unsigned int key_len)
115 {
116 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
117 u32 *flags = &tfm->crt_flags;
118 int ret;
119
120 ret = need_fallback(key_len);
121 if (ret < 0) {
122 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
123 return -EINVAL;
124 }
125
126 sctx->key_len = key_len;
127 if (!ret) {
128 memcpy(sctx->key, in_key, key_len);
129 return 0;
130 }
131
132 return setkey_fallback_cip(tfm, in_key, key_len);
133 }
134
135 static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
136 {
137 const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
138
139 if (unlikely(need_fallback(sctx->key_len))) {
140 crypto_cipher_encrypt_one(sctx->fallback.cip, out, in);
141 return;
142 }
143
144 switch (sctx->key_len) {
145 case 16:
146 crypt_s390_km(KM_AES_128_ENCRYPT, &sctx->key, out, in,
147 AES_BLOCK_SIZE);
148 break;
149 case 24:
150 crypt_s390_km(KM_AES_192_ENCRYPT, &sctx->key, out, in,
151 AES_BLOCK_SIZE);
152 break;
153 case 32:
154 crypt_s390_km(KM_AES_256_ENCRYPT, &sctx->key, out, in,
155 AES_BLOCK_SIZE);
156 break;
157 }
158 }
159
160 static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
161 {
162 const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
163
164 if (unlikely(need_fallback(sctx->key_len))) {
165 crypto_cipher_decrypt_one(sctx->fallback.cip, out, in);
166 return;
167 }
168
169 switch (sctx->key_len) {
170 case 16:
171 crypt_s390_km(KM_AES_128_DECRYPT, &sctx->key, out, in,
172 AES_BLOCK_SIZE);
173 break;
174 case 24:
175 crypt_s390_km(KM_AES_192_DECRYPT, &sctx->key, out, in,
176 AES_BLOCK_SIZE);
177 break;
178 case 32:
179 crypt_s390_km(KM_AES_256_DECRYPT, &sctx->key, out, in,
180 AES_BLOCK_SIZE);
181 break;
182 }
183 }
184
185 static int fallback_init_cip(struct crypto_tfm *tfm)
186 {
187 const char *name = tfm->__crt_alg->cra_name;
188 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
189
190 sctx->fallback.cip = crypto_alloc_cipher(name, 0,
191 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
192
193 if (IS_ERR(sctx->fallback.cip)) {
194 pr_err("Allocating AES fallback algorithm %s failed\n",
195 name);
196 return PTR_ERR(sctx->fallback.cip);
197 }
198
199 return 0;
200 }
201
202 static void fallback_exit_cip(struct crypto_tfm *tfm)
203 {
204 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
205
206 crypto_free_cipher(sctx->fallback.cip);
207 sctx->fallback.cip = NULL;
208 }
209
210 static struct crypto_alg aes_alg = {
211 .cra_name = "aes",
212 .cra_driver_name = "aes-s390",
213 .cra_priority = CRYPT_S390_PRIORITY,
214 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
215 CRYPTO_ALG_NEED_FALLBACK,
216 .cra_blocksize = AES_BLOCK_SIZE,
217 .cra_ctxsize = sizeof(struct s390_aes_ctx),
218 .cra_module = THIS_MODULE,
219 .cra_init = fallback_init_cip,
220 .cra_exit = fallback_exit_cip,
221 .cra_u = {
222 .cipher = {
223 .cia_min_keysize = AES_MIN_KEY_SIZE,
224 .cia_max_keysize = AES_MAX_KEY_SIZE,
225 .cia_setkey = aes_set_key,
226 .cia_encrypt = aes_encrypt,
227 .cia_decrypt = aes_decrypt,
228 }
229 }
230 };
231
232 static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key,
233 unsigned int len)
234 {
235 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
236 unsigned int ret;
237
238 sctx->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
239 sctx->fallback.blk->base.crt_flags |= (tfm->crt_flags &
240 CRYPTO_TFM_REQ_MASK);
241
242 ret = crypto_blkcipher_setkey(sctx->fallback.blk, key, len);
243 if (ret) {
244 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
245 tfm->crt_flags |= (sctx->fallback.blk->base.crt_flags &
246 CRYPTO_TFM_RES_MASK);
247 }
248 return ret;
249 }
250
251 static int fallback_blk_dec(struct blkcipher_desc *desc,
252 struct scatterlist *dst, struct scatterlist *src,
253 unsigned int nbytes)
254 {
255 unsigned int ret;
256 struct crypto_blkcipher *tfm;
257 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
258
259 tfm = desc->tfm;
260 desc->tfm = sctx->fallback.blk;
261
262 ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
263
264 desc->tfm = tfm;
265 return ret;
266 }
267
268 static int fallback_blk_enc(struct blkcipher_desc *desc,
269 struct scatterlist *dst, struct scatterlist *src,
270 unsigned int nbytes)
271 {
272 unsigned int ret;
273 struct crypto_blkcipher *tfm;
274 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
275
276 tfm = desc->tfm;
277 desc->tfm = sctx->fallback.blk;
278
279 ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
280
281 desc->tfm = tfm;
282 return ret;
283 }
284
285 static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
286 unsigned int key_len)
287 {
288 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
289 int ret;
290
291 ret = need_fallback(key_len);
292 if (ret > 0) {
293 sctx->key_len = key_len;
294 return setkey_fallback_blk(tfm, in_key, key_len);
295 }
296
297 switch (key_len) {
298 case 16:
299 sctx->enc = KM_AES_128_ENCRYPT;
300 sctx->dec = KM_AES_128_DECRYPT;
301 break;
302 case 24:
303 sctx->enc = KM_AES_192_ENCRYPT;
304 sctx->dec = KM_AES_192_DECRYPT;
305 break;
306 case 32:
307 sctx->enc = KM_AES_256_ENCRYPT;
308 sctx->dec = KM_AES_256_DECRYPT;
309 break;
310 }
311
312 return aes_set_key(tfm, in_key, key_len);
313 }
314
315 static int ecb_aes_crypt(struct blkcipher_desc *desc, long func, void *param,
316 struct blkcipher_walk *walk)
317 {
318 int ret = blkcipher_walk_virt(desc, walk);
319 unsigned int nbytes;
320
321 while ((nbytes = walk->nbytes)) {
322 /* only use complete blocks */
323 unsigned int n = nbytes & ~(AES_BLOCK_SIZE - 1);
324 u8 *out = walk->dst.virt.addr;
325 u8 *in = walk->src.virt.addr;
326
327 ret = crypt_s390_km(func, param, out, in, n);
328 if (ret < 0 || ret != n)
329 return -EIO;
330
331 nbytes &= AES_BLOCK_SIZE - 1;
332 ret = blkcipher_walk_done(desc, walk, nbytes);
333 }
334
335 return ret;
336 }
337
338 static int ecb_aes_encrypt(struct blkcipher_desc *desc,
339 struct scatterlist *dst, struct scatterlist *src,
340 unsigned int nbytes)
341 {
342 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
343 struct blkcipher_walk walk;
344
345 if (unlikely(need_fallback(sctx->key_len)))
346 return fallback_blk_enc(desc, dst, src, nbytes);
347
348 blkcipher_walk_init(&walk, dst, src, nbytes);
349 return ecb_aes_crypt(desc, sctx->enc, sctx->key, &walk);
350 }
351
352 static int ecb_aes_decrypt(struct blkcipher_desc *desc,
353 struct scatterlist *dst, struct scatterlist *src,
354 unsigned int nbytes)
355 {
356 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
357 struct blkcipher_walk walk;
358
359 if (unlikely(need_fallback(sctx->key_len)))
360 return fallback_blk_dec(desc, dst, src, nbytes);
361
362 blkcipher_walk_init(&walk, dst, src, nbytes);
363 return ecb_aes_crypt(desc, sctx->dec, sctx->key, &walk);
364 }
365
366 static int fallback_init_blk(struct crypto_tfm *tfm)
367 {
368 const char *name = tfm->__crt_alg->cra_name;
369 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
370
371 sctx->fallback.blk = crypto_alloc_blkcipher(name, 0,
372 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
373
374 if (IS_ERR(sctx->fallback.blk)) {
375 pr_err("Allocating AES fallback algorithm %s failed\n",
376 name);
377 return PTR_ERR(sctx->fallback.blk);
378 }
379
380 return 0;
381 }
382
383 static void fallback_exit_blk(struct crypto_tfm *tfm)
384 {
385 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
386
387 crypto_free_blkcipher(sctx->fallback.blk);
388 sctx->fallback.blk = NULL;
389 }
390
391 static struct crypto_alg ecb_aes_alg = {
392 .cra_name = "ecb(aes)",
393 .cra_driver_name = "ecb-aes-s390",
394 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
395 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
396 CRYPTO_ALG_NEED_FALLBACK,
397 .cra_blocksize = AES_BLOCK_SIZE,
398 .cra_ctxsize = sizeof(struct s390_aes_ctx),
399 .cra_type = &crypto_blkcipher_type,
400 .cra_module = THIS_MODULE,
401 .cra_init = fallback_init_blk,
402 .cra_exit = fallback_exit_blk,
403 .cra_u = {
404 .blkcipher = {
405 .min_keysize = AES_MIN_KEY_SIZE,
406 .max_keysize = AES_MAX_KEY_SIZE,
407 .setkey = ecb_aes_set_key,
408 .encrypt = ecb_aes_encrypt,
409 .decrypt = ecb_aes_decrypt,
410 }
411 }
412 };
413
414 static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
415 unsigned int key_len)
416 {
417 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
418 int ret;
419
420 ret = need_fallback(key_len);
421 if (ret > 0) {
422 sctx->key_len = key_len;
423 return setkey_fallback_blk(tfm, in_key, key_len);
424 }
425
426 switch (key_len) {
427 case 16:
428 sctx->enc = KMC_AES_128_ENCRYPT;
429 sctx->dec = KMC_AES_128_DECRYPT;
430 break;
431 case 24:
432 sctx->enc = KMC_AES_192_ENCRYPT;
433 sctx->dec = KMC_AES_192_DECRYPT;
434 break;
435 case 32:
436 sctx->enc = KMC_AES_256_ENCRYPT;
437 sctx->dec = KMC_AES_256_DECRYPT;
438 break;
439 }
440
441 return aes_set_key(tfm, in_key, key_len);
442 }
443
444 static int cbc_aes_crypt(struct blkcipher_desc *desc, long func,
445 struct blkcipher_walk *walk)
446 {
447 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
448 int ret = blkcipher_walk_virt(desc, walk);
449 unsigned int nbytes = walk->nbytes;
450 struct {
451 u8 iv[AES_BLOCK_SIZE];
452 u8 key[AES_MAX_KEY_SIZE];
453 } param;
454
455 if (!nbytes)
456 goto out;
457
458 memcpy(param.iv, walk->iv, AES_BLOCK_SIZE);
459 memcpy(param.key, sctx->key, sctx->key_len);
460 do {
461 /* only use complete blocks */
462 unsigned int n = nbytes & ~(AES_BLOCK_SIZE - 1);
463 u8 *out = walk->dst.virt.addr;
464 u8 *in = walk->src.virt.addr;
465
466 ret = crypt_s390_kmc(func, &param, out, in, n);
467 if (ret < 0 || ret != n)
468 return -EIO;
469
470 nbytes &= AES_BLOCK_SIZE - 1;
471 ret = blkcipher_walk_done(desc, walk, nbytes);
472 } while ((nbytes = walk->nbytes));
473 memcpy(walk->iv, param.iv, AES_BLOCK_SIZE);
474
475 out:
476 return ret;
477 }
478
479 static int cbc_aes_encrypt(struct blkcipher_desc *desc,
480 struct scatterlist *dst, struct scatterlist *src,
481 unsigned int nbytes)
482 {
483 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
484 struct blkcipher_walk walk;
485
486 if (unlikely(need_fallback(sctx->key_len)))
487 return fallback_blk_enc(desc, dst, src, nbytes);
488
489 blkcipher_walk_init(&walk, dst, src, nbytes);
490 return cbc_aes_crypt(desc, sctx->enc, &walk);
491 }
492
493 static int cbc_aes_decrypt(struct blkcipher_desc *desc,
494 struct scatterlist *dst, struct scatterlist *src,
495 unsigned int nbytes)
496 {
497 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
498 struct blkcipher_walk walk;
499
500 if (unlikely(need_fallback(sctx->key_len)))
501 return fallback_blk_dec(desc, dst, src, nbytes);
502
503 blkcipher_walk_init(&walk, dst, src, nbytes);
504 return cbc_aes_crypt(desc, sctx->dec, &walk);
505 }
506
507 static struct crypto_alg cbc_aes_alg = {
508 .cra_name = "cbc(aes)",
509 .cra_driver_name = "cbc-aes-s390",
510 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
511 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
512 CRYPTO_ALG_NEED_FALLBACK,
513 .cra_blocksize = AES_BLOCK_SIZE,
514 .cra_ctxsize = sizeof(struct s390_aes_ctx),
515 .cra_type = &crypto_blkcipher_type,
516 .cra_module = THIS_MODULE,
517 .cra_init = fallback_init_blk,
518 .cra_exit = fallback_exit_blk,
519 .cra_u = {
520 .blkcipher = {
521 .min_keysize = AES_MIN_KEY_SIZE,
522 .max_keysize = AES_MAX_KEY_SIZE,
523 .ivsize = AES_BLOCK_SIZE,
524 .setkey = cbc_aes_set_key,
525 .encrypt = cbc_aes_encrypt,
526 .decrypt = cbc_aes_decrypt,
527 }
528 }
529 };
530
531 static int xts_fallback_setkey(struct crypto_tfm *tfm, const u8 *key,
532 unsigned int len)
533 {
534 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
535 unsigned int ret;
536
537 xts_ctx->fallback->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
538 xts_ctx->fallback->base.crt_flags |= (tfm->crt_flags &
539 CRYPTO_TFM_REQ_MASK);
540
541 ret = crypto_blkcipher_setkey(xts_ctx->fallback, key, len);
542 if (ret) {
543 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
544 tfm->crt_flags |= (xts_ctx->fallback->base.crt_flags &
545 CRYPTO_TFM_RES_MASK);
546 }
547 return ret;
548 }
549
550 static int xts_fallback_decrypt(struct blkcipher_desc *desc,
551 struct scatterlist *dst, struct scatterlist *src,
552 unsigned int nbytes)
553 {
554 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
555 struct crypto_blkcipher *tfm;
556 unsigned int ret;
557
558 tfm = desc->tfm;
559 desc->tfm = xts_ctx->fallback;
560
561 ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
562
563 desc->tfm = tfm;
564 return ret;
565 }
566
567 static int xts_fallback_encrypt(struct blkcipher_desc *desc,
568 struct scatterlist *dst, struct scatterlist *src,
569 unsigned int nbytes)
570 {
571 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
572 struct crypto_blkcipher *tfm;
573 unsigned int ret;
574
575 tfm = desc->tfm;
576 desc->tfm = xts_ctx->fallback;
577
578 ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
579
580 desc->tfm = tfm;
581 return ret;
582 }
583
584 static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
585 unsigned int key_len)
586 {
587 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
588 u32 *flags = &tfm->crt_flags;
589
590 switch (key_len) {
591 case 32:
592 xts_ctx->enc = KM_XTS_128_ENCRYPT;
593 xts_ctx->dec = KM_XTS_128_DECRYPT;
594 memcpy(xts_ctx->key + 16, in_key, 16);
595 memcpy(xts_ctx->pcc_key + 16, in_key + 16, 16);
596 break;
597 case 48:
598 xts_ctx->enc = 0;
599 xts_ctx->dec = 0;
600 xts_fallback_setkey(tfm, in_key, key_len);
601 break;
602 case 64:
603 xts_ctx->enc = KM_XTS_256_ENCRYPT;
604 xts_ctx->dec = KM_XTS_256_DECRYPT;
605 memcpy(xts_ctx->key, in_key, 32);
606 memcpy(xts_ctx->pcc_key, in_key + 32, 32);
607 break;
608 default:
609 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
610 return -EINVAL;
611 }
612 xts_ctx->key_len = key_len;
613 return 0;
614 }
615
616 static int xts_aes_crypt(struct blkcipher_desc *desc, long func,
617 struct s390_xts_ctx *xts_ctx,
618 struct blkcipher_walk *walk)
619 {
620 unsigned int offset = (xts_ctx->key_len >> 1) & 0x10;
621 int ret = blkcipher_walk_virt(desc, walk);
622 unsigned int nbytes = walk->nbytes;
623 unsigned int n;
624 u8 *in, *out;
625 struct pcc_param pcc_param;
626 struct {
627 u8 key[32];
628 u8 init[16];
629 } xts_param;
630
631 if (!nbytes)
632 goto out;
633
634 memset(pcc_param.block, 0, sizeof(pcc_param.block));
635 memset(pcc_param.bit, 0, sizeof(pcc_param.bit));
636 memset(pcc_param.xts, 0, sizeof(pcc_param.xts));
637 memcpy(pcc_param.tweak, walk->iv, sizeof(pcc_param.tweak));
638 memcpy(pcc_param.key, xts_ctx->pcc_key, 32);
639 ret = crypt_s390_pcc(func, &pcc_param.key[offset]);
640 if (ret < 0)
641 return -EIO;
642
643 memcpy(xts_param.key, xts_ctx->key, 32);
644 memcpy(xts_param.init, pcc_param.xts, 16);
645 do {
646 /* only use complete blocks */
647 n = nbytes & ~(AES_BLOCK_SIZE - 1);
648 out = walk->dst.virt.addr;
649 in = walk->src.virt.addr;
650
651 ret = crypt_s390_km(func, &xts_param.key[offset], out, in, n);
652 if (ret < 0 || ret != n)
653 return -EIO;
654
655 nbytes &= AES_BLOCK_SIZE - 1;
656 ret = blkcipher_walk_done(desc, walk, nbytes);
657 } while ((nbytes = walk->nbytes));
658 out:
659 return ret;
660 }
661
662 static int xts_aes_encrypt(struct blkcipher_desc *desc,
663 struct scatterlist *dst, struct scatterlist *src,
664 unsigned int nbytes)
665 {
666 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
667 struct blkcipher_walk walk;
668
669 if (unlikely(xts_ctx->key_len == 48))
670 return xts_fallback_encrypt(desc, dst, src, nbytes);
671
672 blkcipher_walk_init(&walk, dst, src, nbytes);
673 return xts_aes_crypt(desc, xts_ctx->enc, xts_ctx, &walk);
674 }
675
676 static int xts_aes_decrypt(struct blkcipher_desc *desc,
677 struct scatterlist *dst, struct scatterlist *src,
678 unsigned int nbytes)
679 {
680 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
681 struct blkcipher_walk walk;
682
683 if (unlikely(xts_ctx->key_len == 48))
684 return xts_fallback_decrypt(desc, dst, src, nbytes);
685
686 blkcipher_walk_init(&walk, dst, src, nbytes);
687 return xts_aes_crypt(desc, xts_ctx->dec, xts_ctx, &walk);
688 }
689
690 static int xts_fallback_init(struct crypto_tfm *tfm)
691 {
692 const char *name = tfm->__crt_alg->cra_name;
693 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
694
695 xts_ctx->fallback = crypto_alloc_blkcipher(name, 0,
696 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
697
698 if (IS_ERR(xts_ctx->fallback)) {
699 pr_err("Allocating XTS fallback algorithm %s failed\n",
700 name);
701 return PTR_ERR(xts_ctx->fallback);
702 }
703 return 0;
704 }
705
706 static void xts_fallback_exit(struct crypto_tfm *tfm)
707 {
708 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
709
710 crypto_free_blkcipher(xts_ctx->fallback);
711 xts_ctx->fallback = NULL;
712 }
713
714 static struct crypto_alg xts_aes_alg = {
715 .cra_name = "xts(aes)",
716 .cra_driver_name = "xts-aes-s390",
717 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
718 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
719 CRYPTO_ALG_NEED_FALLBACK,
720 .cra_blocksize = AES_BLOCK_SIZE,
721 .cra_ctxsize = sizeof(struct s390_xts_ctx),
722 .cra_type = &crypto_blkcipher_type,
723 .cra_module = THIS_MODULE,
724 .cra_init = xts_fallback_init,
725 .cra_exit = xts_fallback_exit,
726 .cra_u = {
727 .blkcipher = {
728 .min_keysize = 2 * AES_MIN_KEY_SIZE,
729 .max_keysize = 2 * AES_MAX_KEY_SIZE,
730 .ivsize = AES_BLOCK_SIZE,
731 .setkey = xts_aes_set_key,
732 .encrypt = xts_aes_encrypt,
733 .decrypt = xts_aes_decrypt,
734 }
735 }
736 };
737
738 static int xts_aes_alg_reg;
739
740 static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
741 unsigned int key_len)
742 {
743 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
744
745 switch (key_len) {
746 case 16:
747 sctx->enc = KMCTR_AES_128_ENCRYPT;
748 sctx->dec = KMCTR_AES_128_DECRYPT;
749 break;
750 case 24:
751 sctx->enc = KMCTR_AES_192_ENCRYPT;
752 sctx->dec = KMCTR_AES_192_DECRYPT;
753 break;
754 case 32:
755 sctx->enc = KMCTR_AES_256_ENCRYPT;
756 sctx->dec = KMCTR_AES_256_DECRYPT;
757 break;
758 }
759
760 return aes_set_key(tfm, in_key, key_len);
761 }
762
763 static unsigned int __ctrblk_init(u8 *ctrptr, unsigned int nbytes)
764 {
765 unsigned int i, n;
766
767 /* only use complete blocks, max. PAGE_SIZE */
768 n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);
769 for (i = AES_BLOCK_SIZE; i < n; i += AES_BLOCK_SIZE) {
770 memcpy(ctrptr + i, ctrptr + i - AES_BLOCK_SIZE,
771 AES_BLOCK_SIZE);
772 crypto_inc(ctrptr + i, AES_BLOCK_SIZE);
773 }
774 return n;
775 }
776
777 static int ctr_aes_crypt(struct blkcipher_desc *desc, long func,
778 struct s390_aes_ctx *sctx, struct blkcipher_walk *walk)
779 {
780 int ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
781 unsigned int n, nbytes;
782 u8 buf[AES_BLOCK_SIZE], ctrbuf[AES_BLOCK_SIZE];
783 u8 *out, *in, *ctrptr = ctrbuf;
784
785 if (!walk->nbytes)
786 return ret;
787
788 if (spin_trylock(&ctrblk_lock))
789 ctrptr = ctrblk;
790
791 memcpy(ctrptr, walk->iv, AES_BLOCK_SIZE);
792 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
793 out = walk->dst.virt.addr;
794 in = walk->src.virt.addr;
795 while (nbytes >= AES_BLOCK_SIZE) {
796 if (ctrptr == ctrblk)
797 n = __ctrblk_init(ctrptr, nbytes);
798 else
799 n = AES_BLOCK_SIZE;
800 ret = crypt_s390_kmctr(func, sctx->key, out, in,
801 n, ctrptr);
802 if (ret < 0 || ret != n) {
803 if (ctrptr == ctrblk)
804 spin_unlock(&ctrblk_lock);
805 return -EIO;
806 }
807 if (n > AES_BLOCK_SIZE)
808 memcpy(ctrptr, ctrptr + n - AES_BLOCK_SIZE,
809 AES_BLOCK_SIZE);
810 crypto_inc(ctrptr, AES_BLOCK_SIZE);
811 out += n;
812 in += n;
813 nbytes -= n;
814 }
815 ret = blkcipher_walk_done(desc, walk, nbytes);
816 }
817 if (ctrptr == ctrblk) {
818 if (nbytes)
819 memcpy(ctrbuf, ctrptr, AES_BLOCK_SIZE);
820 else
821 memcpy(walk->iv, ctrptr, AES_BLOCK_SIZE);
822 spin_unlock(&ctrblk_lock);
823 } else {
824 if (!nbytes)
825 memcpy(walk->iv, ctrptr, AES_BLOCK_SIZE);
826 }
827 /*
828 * final block may be < AES_BLOCK_SIZE, copy only nbytes
829 */
830 if (nbytes) {
831 out = walk->dst.virt.addr;
832 in = walk->src.virt.addr;
833 ret = crypt_s390_kmctr(func, sctx->key, buf, in,
834 AES_BLOCK_SIZE, ctrbuf);
835 if (ret < 0 || ret != AES_BLOCK_SIZE)
836 return -EIO;
837 memcpy(out, buf, nbytes);
838 crypto_inc(ctrbuf, AES_BLOCK_SIZE);
839 ret = blkcipher_walk_done(desc, walk, 0);
840 memcpy(walk->iv, ctrbuf, AES_BLOCK_SIZE);
841 }
842
843 return ret;
844 }
845
846 static int ctr_aes_encrypt(struct blkcipher_desc *desc,
847 struct scatterlist *dst, struct scatterlist *src,
848 unsigned int nbytes)
849 {
850 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
851 struct blkcipher_walk walk;
852
853 blkcipher_walk_init(&walk, dst, src, nbytes);
854 return ctr_aes_crypt(desc, sctx->enc, sctx, &walk);
855 }
856
857 static int ctr_aes_decrypt(struct blkcipher_desc *desc,
858 struct scatterlist *dst, struct scatterlist *src,
859 unsigned int nbytes)
860 {
861 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
862 struct blkcipher_walk walk;
863
864 blkcipher_walk_init(&walk, dst, src, nbytes);
865 return ctr_aes_crypt(desc, sctx->dec, sctx, &walk);
866 }
867
868 static struct crypto_alg ctr_aes_alg = {
869 .cra_name = "ctr(aes)",
870 .cra_driver_name = "ctr-aes-s390",
871 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
872 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
873 .cra_blocksize = 1,
874 .cra_ctxsize = sizeof(struct s390_aes_ctx),
875 .cra_type = &crypto_blkcipher_type,
876 .cra_module = THIS_MODULE,
877 .cra_u = {
878 .blkcipher = {
879 .min_keysize = AES_MIN_KEY_SIZE,
880 .max_keysize = AES_MAX_KEY_SIZE,
881 .ivsize = AES_BLOCK_SIZE,
882 .setkey = ctr_aes_set_key,
883 .encrypt = ctr_aes_encrypt,
884 .decrypt = ctr_aes_decrypt,
885 }
886 }
887 };
888
889 static int ctr_aes_alg_reg;
890
891 static int __init aes_s390_init(void)
892 {
893 int ret;
894
895 if (crypt_s390_func_available(KM_AES_128_ENCRYPT, CRYPT_S390_MSA))
896 keylen_flag |= AES_KEYLEN_128;
897 if (crypt_s390_func_available(KM_AES_192_ENCRYPT, CRYPT_S390_MSA))
898 keylen_flag |= AES_KEYLEN_192;
899 if (crypt_s390_func_available(KM_AES_256_ENCRYPT, CRYPT_S390_MSA))
900 keylen_flag |= AES_KEYLEN_256;
901
902 if (!keylen_flag)
903 return -EOPNOTSUPP;
904
905 /* z9 109 and z9 BC/EC only support 128 bit key length */
906 if (keylen_flag == AES_KEYLEN_128)
907 pr_info("AES hardware acceleration is only available for"
908 " 128-bit keys\n");
909
910 ret = crypto_register_alg(&aes_alg);
911 if (ret)
912 goto aes_err;
913
914 ret = crypto_register_alg(&ecb_aes_alg);
915 if (ret)
916 goto ecb_aes_err;
917
918 ret = crypto_register_alg(&cbc_aes_alg);
919 if (ret)
920 goto cbc_aes_err;
921
922 if (crypt_s390_func_available(KM_XTS_128_ENCRYPT,
923 CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
924 crypt_s390_func_available(KM_XTS_256_ENCRYPT,
925 CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
926 ret = crypto_register_alg(&xts_aes_alg);
927 if (ret)
928 goto xts_aes_err;
929 xts_aes_alg_reg = 1;
930 }
931
932 if (crypt_s390_func_available(KMCTR_AES_128_ENCRYPT,
933 CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
934 crypt_s390_func_available(KMCTR_AES_192_ENCRYPT,
935 CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
936 crypt_s390_func_available(KMCTR_AES_256_ENCRYPT,
937 CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
938 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
939 if (!ctrblk) {
940 ret = -ENOMEM;
941 goto ctr_aes_err;
942 }
943 ret = crypto_register_alg(&ctr_aes_alg);
944 if (ret) {
945 free_page((unsigned long) ctrblk);
946 goto ctr_aes_err;
947 }
948 ctr_aes_alg_reg = 1;
949 }
950
951 out:
952 return ret;
953
954 ctr_aes_err:
955 crypto_unregister_alg(&xts_aes_alg);
956 xts_aes_err:
957 crypto_unregister_alg(&cbc_aes_alg);
958 cbc_aes_err:
959 crypto_unregister_alg(&ecb_aes_alg);
960 ecb_aes_err:
961 crypto_unregister_alg(&aes_alg);
962 aes_err:
963 goto out;
964 }
965
966 static void __exit aes_s390_fini(void)
967 {
968 if (ctr_aes_alg_reg) {
969 crypto_unregister_alg(&ctr_aes_alg);
970 free_page((unsigned long) ctrblk);
971 }
972 if (xts_aes_alg_reg)
973 crypto_unregister_alg(&xts_aes_alg);
974 crypto_unregister_alg(&cbc_aes_alg);
975 crypto_unregister_alg(&ecb_aes_alg);
976 crypto_unregister_alg(&aes_alg);
977 }
978
979 module_init(aes_s390_init);
980 module_exit(aes_s390_fini);
981
982 MODULE_ALIAS_CRYPTO("aes-all");
983
984 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
985 MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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