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spi-topcliff-pch: Fix issue for transmitting over 4KByte
[zen-stable.git] / arch / s390 / crypto / aes_s390.c
bloba9ce135893f8c215e0ac19cb91b3429522010f6e
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 "crypt_s390.h"
29
30 #define AES_KEYLEN_128 1
31 #define AES_KEYLEN_192 2
32 #define AES_KEYLEN_256 4
33
34 static u8 *ctrblk;
35 static char keylen_flag;
36
37 struct s390_aes_ctx {
38 u8 iv[AES_BLOCK_SIZE];
39 u8 key[AES_MAX_KEY_SIZE];
40 long enc;
41 long dec;
42 int key_len;
43 union {
44 struct crypto_blkcipher *blk;
45 struct crypto_cipher *cip;
46 } fallback;
47 };
48
49 struct pcc_param {
50 u8 key[32];
51 u8 tweak[16];
52 u8 block[16];
53 u8 bit[16];
54 u8 xts[16];
55 };
56
57 struct s390_xts_ctx {
58 u8 key[32];
59 u8 xts_param[16];
60 struct pcc_param pcc;
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_list = LIST_HEAD_INIT(aes_alg.cra_list),
220 .cra_init = fallback_init_cip,
221 .cra_exit = fallback_exit_cip,
222 .cra_u = {
223 .cipher = {
224 .cia_min_keysize = AES_MIN_KEY_SIZE,
225 .cia_max_keysize = AES_MAX_KEY_SIZE,
226 .cia_setkey = aes_set_key,
227 .cia_encrypt = aes_encrypt,
228 .cia_decrypt = aes_decrypt,
229 }
230 }
231 };
232
233 static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key,
234 unsigned int len)
235 {
236 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
237 unsigned int ret;
238
239 sctx->fallback.blk->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
240 sctx->fallback.blk->base.crt_flags |= (tfm->crt_flags &
241 CRYPTO_TFM_REQ_MASK);
242
243 ret = crypto_blkcipher_setkey(sctx->fallback.blk, key, len);
244 if (ret) {
245 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
246 tfm->crt_flags |= (sctx->fallback.blk->base.crt_flags &
247 CRYPTO_TFM_RES_MASK);
248 }
249 return ret;
250 }
251
252 static int fallback_blk_dec(struct blkcipher_desc *desc,
253 struct scatterlist *dst, struct scatterlist *src,
254 unsigned int nbytes)
255 {
256 unsigned int ret;
257 struct crypto_blkcipher *tfm;
258 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
259
260 tfm = desc->tfm;
261 desc->tfm = sctx->fallback.blk;
262
263 ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
264
265 desc->tfm = tfm;
266 return ret;
267 }
268
269 static int fallback_blk_enc(struct blkcipher_desc *desc,
270 struct scatterlist *dst, struct scatterlist *src,
271 unsigned int nbytes)
272 {
273 unsigned int ret;
274 struct crypto_blkcipher *tfm;
275 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
276
277 tfm = desc->tfm;
278 desc->tfm = sctx->fallback.blk;
279
280 ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
281
282 desc->tfm = tfm;
283 return ret;
284 }
285
286 static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
287 unsigned int key_len)
288 {
289 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
290 int ret;
291
292 ret = need_fallback(key_len);
293 if (ret > 0) {
294 sctx->key_len = key_len;
295 return setkey_fallback_blk(tfm, in_key, key_len);
296 }
297
298 switch (key_len) {
299 case 16:
300 sctx->enc = KM_AES_128_ENCRYPT;
301 sctx->dec = KM_AES_128_DECRYPT;
302 break;
303 case 24:
304 sctx->enc = KM_AES_192_ENCRYPT;
305 sctx->dec = KM_AES_192_DECRYPT;
306 break;
307 case 32:
308 sctx->enc = KM_AES_256_ENCRYPT;
309 sctx->dec = KM_AES_256_DECRYPT;
310 break;
311 }
312
313 return aes_set_key(tfm, in_key, key_len);
314 }
315
316 static int ecb_aes_crypt(struct blkcipher_desc *desc, long func, void *param,
317 struct blkcipher_walk *walk)
318 {
319 int ret = blkcipher_walk_virt(desc, walk);
320 unsigned int nbytes;
321
322 while ((nbytes = walk->nbytes)) {
323 /* only use complete blocks */
324 unsigned int n = nbytes & ~(AES_BLOCK_SIZE - 1);
325 u8 *out = walk->dst.virt.addr;
326 u8 *in = walk->src.virt.addr;
327
328 ret = crypt_s390_km(func, param, out, in, n);
329 BUG_ON((ret < 0) || (ret != n));
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_list = LIST_HEAD_INIT(ecb_aes_alg.cra_list),
402 .cra_init = fallback_init_blk,
403 .cra_exit = fallback_exit_blk,
404 .cra_u = {
405 .blkcipher = {
406 .min_keysize = AES_MIN_KEY_SIZE,
407 .max_keysize = AES_MAX_KEY_SIZE,
408 .setkey = ecb_aes_set_key,
409 .encrypt = ecb_aes_encrypt,
410 .decrypt = ecb_aes_decrypt,
411 }
412 }
413 };
414
415 static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
416 unsigned int key_len)
417 {
418 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
419 int ret;
420
421 ret = need_fallback(key_len);
422 if (ret > 0) {
423 sctx->key_len = key_len;
424 return setkey_fallback_blk(tfm, in_key, key_len);
425 }
426
427 switch (key_len) {
428 case 16:
429 sctx->enc = KMC_AES_128_ENCRYPT;
430 sctx->dec = KMC_AES_128_DECRYPT;
431 break;
432 case 24:
433 sctx->enc = KMC_AES_192_ENCRYPT;
434 sctx->dec = KMC_AES_192_DECRYPT;
435 break;
436 case 32:
437 sctx->enc = KMC_AES_256_ENCRYPT;
438 sctx->dec = KMC_AES_256_DECRYPT;
439 break;
440 }
441
442 return aes_set_key(tfm, in_key, key_len);
443 }
444
445 static int cbc_aes_crypt(struct blkcipher_desc *desc, long func, void *param,
446 struct blkcipher_walk *walk)
447 {
448 int ret = blkcipher_walk_virt(desc, walk);
449 unsigned int nbytes = walk->nbytes;
450
451 if (!nbytes)
452 goto out;
453
454 memcpy(param, walk->iv, AES_BLOCK_SIZE);
455 do {
456 /* only use complete blocks */
457 unsigned int n = nbytes & ~(AES_BLOCK_SIZE - 1);
458 u8 *out = walk->dst.virt.addr;
459 u8 *in = walk->src.virt.addr;
460
461 ret = crypt_s390_kmc(func, param, out, in, n);
462 BUG_ON((ret < 0) || (ret != n));
463
464 nbytes &= AES_BLOCK_SIZE - 1;
465 ret = blkcipher_walk_done(desc, walk, nbytes);
466 } while ((nbytes = walk->nbytes));
467 memcpy(walk->iv, param, AES_BLOCK_SIZE);
468
469 out:
470 return ret;
471 }
472
473 static int cbc_aes_encrypt(struct blkcipher_desc *desc,
474 struct scatterlist *dst, struct scatterlist *src,
475 unsigned int nbytes)
476 {
477 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
478 struct blkcipher_walk walk;
479
480 if (unlikely(need_fallback(sctx->key_len)))
481 return fallback_blk_enc(desc, dst, src, nbytes);
482
483 blkcipher_walk_init(&walk, dst, src, nbytes);
484 return cbc_aes_crypt(desc, sctx->enc, sctx->iv, &walk);
485 }
486
487 static int cbc_aes_decrypt(struct blkcipher_desc *desc,
488 struct scatterlist *dst, struct scatterlist *src,
489 unsigned int nbytes)
490 {
491 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
492 struct blkcipher_walk walk;
493
494 if (unlikely(need_fallback(sctx->key_len)))
495 return fallback_blk_dec(desc, dst, src, nbytes);
496
497 blkcipher_walk_init(&walk, dst, src, nbytes);
498 return cbc_aes_crypt(desc, sctx->dec, sctx->iv, &walk);
499 }
500
501 static struct crypto_alg cbc_aes_alg = {
502 .cra_name = "cbc(aes)",
503 .cra_driver_name = "cbc-aes-s390",
504 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
505 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
506 CRYPTO_ALG_NEED_FALLBACK,
507 .cra_blocksize = AES_BLOCK_SIZE,
508 .cra_ctxsize = sizeof(struct s390_aes_ctx),
509 .cra_type = &crypto_blkcipher_type,
510 .cra_module = THIS_MODULE,
511 .cra_list = LIST_HEAD_INIT(cbc_aes_alg.cra_list),
512 .cra_init = fallback_init_blk,
513 .cra_exit = fallback_exit_blk,
514 .cra_u = {
515 .blkcipher = {
516 .min_keysize = AES_MIN_KEY_SIZE,
517 .max_keysize = AES_MAX_KEY_SIZE,
518 .ivsize = AES_BLOCK_SIZE,
519 .setkey = cbc_aes_set_key,
520 .encrypt = cbc_aes_encrypt,
521 .decrypt = cbc_aes_decrypt,
522 }
523 }
524 };
525
526 static int xts_fallback_setkey(struct crypto_tfm *tfm, const u8 *key,
527 unsigned int len)
528 {
529 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
530 unsigned int ret;
531
532 xts_ctx->fallback->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
533 xts_ctx->fallback->base.crt_flags |= (tfm->crt_flags &
534 CRYPTO_TFM_REQ_MASK);
535
536 ret = crypto_blkcipher_setkey(xts_ctx->fallback, key, len);
537 if (ret) {
538 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
539 tfm->crt_flags |= (xts_ctx->fallback->base.crt_flags &
540 CRYPTO_TFM_RES_MASK);
541 }
542 return ret;
543 }
544
545 static int xts_fallback_decrypt(struct blkcipher_desc *desc,
546 struct scatterlist *dst, struct scatterlist *src,
547 unsigned int nbytes)
548 {
549 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
550 struct crypto_blkcipher *tfm;
551 unsigned int ret;
552
553 tfm = desc->tfm;
554 desc->tfm = xts_ctx->fallback;
555
556 ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
557
558 desc->tfm = tfm;
559 return ret;
560 }
561
562 static int xts_fallback_encrypt(struct blkcipher_desc *desc,
563 struct scatterlist *dst, struct scatterlist *src,
564 unsigned int nbytes)
565 {
566 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
567 struct crypto_blkcipher *tfm;
568 unsigned int ret;
569
570 tfm = desc->tfm;
571 desc->tfm = xts_ctx->fallback;
572
573 ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
574
575 desc->tfm = tfm;
576 return ret;
577 }
578
579 static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
580 unsigned int key_len)
581 {
582 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
583 u32 *flags = &tfm->crt_flags;
584
585 switch (key_len) {
586 case 32:
587 xts_ctx->enc = KM_XTS_128_ENCRYPT;
588 xts_ctx->dec = KM_XTS_128_DECRYPT;
589 memcpy(xts_ctx->key + 16, in_key, 16);
590 memcpy(xts_ctx->pcc.key + 16, in_key + 16, 16);
591 break;
592 case 48:
593 xts_ctx->enc = 0;
594 xts_ctx->dec = 0;
595 xts_fallback_setkey(tfm, in_key, key_len);
596 break;
597 case 64:
598 xts_ctx->enc = KM_XTS_256_ENCRYPT;
599 xts_ctx->dec = KM_XTS_256_DECRYPT;
600 memcpy(xts_ctx->key, in_key, 32);
601 memcpy(xts_ctx->pcc.key, in_key + 32, 32);
602 break;
603 default:
604 *flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
605 return -EINVAL;
606 }
607 xts_ctx->key_len = key_len;
608 return 0;
609 }
610
611 static int xts_aes_crypt(struct blkcipher_desc *desc, long func,
612 struct s390_xts_ctx *xts_ctx,
613 struct blkcipher_walk *walk)
614 {
615 unsigned int offset = (xts_ctx->key_len >> 1) & 0x10;
616 int ret = blkcipher_walk_virt(desc, walk);
617 unsigned int nbytes = walk->nbytes;
618 unsigned int n;
619 u8 *in, *out;
620 void *param;
621
622 if (!nbytes)
623 goto out;
624
625 memset(xts_ctx->pcc.block, 0, sizeof(xts_ctx->pcc.block));
626 memset(xts_ctx->pcc.bit, 0, sizeof(xts_ctx->pcc.bit));
627 memset(xts_ctx->pcc.xts, 0, sizeof(xts_ctx->pcc.xts));
628 memcpy(xts_ctx->pcc.tweak, walk->iv, sizeof(xts_ctx->pcc.tweak));
629 param = xts_ctx->pcc.key + offset;
630 ret = crypt_s390_pcc(func, param);
631 BUG_ON(ret < 0);
632
633 memcpy(xts_ctx->xts_param, xts_ctx->pcc.xts, 16);
634 param = xts_ctx->key + offset;
635 do {
636 /* only use complete blocks */
637 n = nbytes & ~(AES_BLOCK_SIZE - 1);
638 out = walk->dst.virt.addr;
639 in = walk->src.virt.addr;
640
641 ret = crypt_s390_km(func, param, out, in, n);
642 BUG_ON(ret < 0 || ret != n);
643
644 nbytes &= AES_BLOCK_SIZE - 1;
645 ret = blkcipher_walk_done(desc, walk, nbytes);
646 } while ((nbytes = walk->nbytes));
647 out:
648 return ret;
649 }
650
651 static int xts_aes_encrypt(struct blkcipher_desc *desc,
652 struct scatterlist *dst, struct scatterlist *src,
653 unsigned int nbytes)
654 {
655 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
656 struct blkcipher_walk walk;
657
658 if (unlikely(xts_ctx->key_len == 48))
659 return xts_fallback_encrypt(desc, dst, src, nbytes);
660
661 blkcipher_walk_init(&walk, dst, src, nbytes);
662 return xts_aes_crypt(desc, xts_ctx->enc, xts_ctx, &walk);
663 }
664
665 static int xts_aes_decrypt(struct blkcipher_desc *desc,
666 struct scatterlist *dst, struct scatterlist *src,
667 unsigned int nbytes)
668 {
669 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
670 struct blkcipher_walk walk;
671
672 if (unlikely(xts_ctx->key_len == 48))
673 return xts_fallback_decrypt(desc, dst, src, nbytes);
674
675 blkcipher_walk_init(&walk, dst, src, nbytes);
676 return xts_aes_crypt(desc, xts_ctx->dec, xts_ctx, &walk);
677 }
678
679 static int xts_fallback_init(struct crypto_tfm *tfm)
680 {
681 const char *name = tfm->__crt_alg->cra_name;
682 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
683
684 xts_ctx->fallback = crypto_alloc_blkcipher(name, 0,
685 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
686
687 if (IS_ERR(xts_ctx->fallback)) {
688 pr_err("Allocating XTS fallback algorithm %s failed\n",
689 name);
690 return PTR_ERR(xts_ctx->fallback);
691 }
692 return 0;
693 }
694
695 static void xts_fallback_exit(struct crypto_tfm *tfm)
696 {
697 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
698
699 crypto_free_blkcipher(xts_ctx->fallback);
700 xts_ctx->fallback = NULL;
701 }
702
703 static struct crypto_alg xts_aes_alg = {
704 .cra_name = "xts(aes)",
705 .cra_driver_name = "xts-aes-s390",
706 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
707 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
708 CRYPTO_ALG_NEED_FALLBACK,
709 .cra_blocksize = AES_BLOCK_SIZE,
710 .cra_ctxsize = sizeof(struct s390_xts_ctx),
711 .cra_type = &crypto_blkcipher_type,
712 .cra_module = THIS_MODULE,
713 .cra_list = LIST_HEAD_INIT(xts_aes_alg.cra_list),
714 .cra_init = xts_fallback_init,
715 .cra_exit = xts_fallback_exit,
716 .cra_u = {
717 .blkcipher = {
718 .min_keysize = 2 * AES_MIN_KEY_SIZE,
719 .max_keysize = 2 * AES_MAX_KEY_SIZE,
720 .ivsize = AES_BLOCK_SIZE,
721 .setkey = xts_aes_set_key,
722 .encrypt = xts_aes_encrypt,
723 .decrypt = xts_aes_decrypt,
724 }
725 }
726 };
727
728 static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
729 unsigned int key_len)
730 {
731 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
732
733 switch (key_len) {
734 case 16:
735 sctx->enc = KMCTR_AES_128_ENCRYPT;
736 sctx->dec = KMCTR_AES_128_DECRYPT;
737 break;
738 case 24:
739 sctx->enc = KMCTR_AES_192_ENCRYPT;
740 sctx->dec = KMCTR_AES_192_DECRYPT;
741 break;
742 case 32:
743 sctx->enc = KMCTR_AES_256_ENCRYPT;
744 sctx->dec = KMCTR_AES_256_DECRYPT;
745 break;
746 }
747
748 return aes_set_key(tfm, in_key, key_len);
749 }
750
751 static int ctr_aes_crypt(struct blkcipher_desc *desc, long func,
752 struct s390_aes_ctx *sctx, struct blkcipher_walk *walk)
753 {
754 int ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
755 unsigned int i, n, nbytes;
756 u8 buf[AES_BLOCK_SIZE];
757 u8 *out, *in;
758
759 if (!walk->nbytes)
760 return ret;
761
762 memcpy(ctrblk, walk->iv, AES_BLOCK_SIZE);
763 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
764 out = walk->dst.virt.addr;
765 in = walk->src.virt.addr;
766 while (nbytes >= AES_BLOCK_SIZE) {
767 /* only use complete blocks, max. PAGE_SIZE */
768 n = (nbytes > PAGE_SIZE) ? PAGE_SIZE :
769 nbytes & ~(AES_BLOCK_SIZE - 1);
770 for (i = AES_BLOCK_SIZE; i < n; i += AES_BLOCK_SIZE) {
771 memcpy(ctrblk + i, ctrblk + i - AES_BLOCK_SIZE,
772 AES_BLOCK_SIZE);
773 crypto_inc(ctrblk + i, AES_BLOCK_SIZE);
774 }
775 ret = crypt_s390_kmctr(func, sctx->key, out, in, n, ctrblk);
776 BUG_ON(ret < 0 || ret != n);
777 if (n > AES_BLOCK_SIZE)
778 memcpy(ctrblk, ctrblk + n - AES_BLOCK_SIZE,
779 AES_BLOCK_SIZE);
780 crypto_inc(ctrblk, AES_BLOCK_SIZE);
781 out += n;
782 in += n;
783 nbytes -= n;
784 }
785 ret = blkcipher_walk_done(desc, walk, nbytes);
786 }
787 /*
788 * final block may be < AES_BLOCK_SIZE, copy only nbytes
789 */
790 if (nbytes) {
791 out = walk->dst.virt.addr;
792 in = walk->src.virt.addr;
793 ret = crypt_s390_kmctr(func, sctx->key, buf, in,
794 AES_BLOCK_SIZE, ctrblk);
795 BUG_ON(ret < 0 || ret != AES_BLOCK_SIZE);
796 memcpy(out, buf, nbytes);
797 crypto_inc(ctrblk, AES_BLOCK_SIZE);
798 ret = blkcipher_walk_done(desc, walk, 0);
799 }
800 memcpy(walk->iv, ctrblk, AES_BLOCK_SIZE);
801 return ret;
802 }
803
804 static int ctr_aes_encrypt(struct blkcipher_desc *desc,
805 struct scatterlist *dst, struct scatterlist *src,
806 unsigned int nbytes)
807 {
808 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
809 struct blkcipher_walk walk;
810
811 blkcipher_walk_init(&walk, dst, src, nbytes);
812 return ctr_aes_crypt(desc, sctx->enc, sctx, &walk);
813 }
814
815 static int ctr_aes_decrypt(struct blkcipher_desc *desc,
816 struct scatterlist *dst, struct scatterlist *src,
817 unsigned int nbytes)
818 {
819 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
820 struct blkcipher_walk walk;
821
822 blkcipher_walk_init(&walk, dst, src, nbytes);
823 return ctr_aes_crypt(desc, sctx->dec, sctx, &walk);
824 }
825
826 static struct crypto_alg ctr_aes_alg = {
827 .cra_name = "ctr(aes)",
828 .cra_driver_name = "ctr-aes-s390",
829 .cra_priority = CRYPT_S390_COMPOSITE_PRIORITY,
830 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
831 .cra_blocksize = 1,
832 .cra_ctxsize = sizeof(struct s390_aes_ctx),
833 .cra_type = &crypto_blkcipher_type,
834 .cra_module = THIS_MODULE,
835 .cra_list = LIST_HEAD_INIT(ctr_aes_alg.cra_list),
836 .cra_u = {
837 .blkcipher = {
838 .min_keysize = AES_MIN_KEY_SIZE,
839 .max_keysize = AES_MAX_KEY_SIZE,
840 .ivsize = AES_BLOCK_SIZE,
841 .setkey = ctr_aes_set_key,
842 .encrypt = ctr_aes_encrypt,
843 .decrypt = ctr_aes_decrypt,
844 }
845 }
846 };
847
848 static int __init aes_s390_init(void)
849 {
850 int ret;
851
852 if (crypt_s390_func_available(KM_AES_128_ENCRYPT, CRYPT_S390_MSA))
853 keylen_flag |= AES_KEYLEN_128;
854 if (crypt_s390_func_available(KM_AES_192_ENCRYPT, CRYPT_S390_MSA))
855 keylen_flag |= AES_KEYLEN_192;
856 if (crypt_s390_func_available(KM_AES_256_ENCRYPT, CRYPT_S390_MSA))
857 keylen_flag |= AES_KEYLEN_256;
858
859 if (!keylen_flag)
860 return -EOPNOTSUPP;
861
862 /* z9 109 and z9 BC/EC only support 128 bit key length */
863 if (keylen_flag == AES_KEYLEN_128)
864 pr_info("AES hardware acceleration is only available for"
865 " 128-bit keys\n");
866
867 ret = crypto_register_alg(&aes_alg);
868 if (ret)
869 goto aes_err;
870
871 ret = crypto_register_alg(&ecb_aes_alg);
872 if (ret)
873 goto ecb_aes_err;
874
875 ret = crypto_register_alg(&cbc_aes_alg);
876 if (ret)
877 goto cbc_aes_err;
878
879 if (crypt_s390_func_available(KM_XTS_128_ENCRYPT,
880 CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
881 crypt_s390_func_available(KM_XTS_256_ENCRYPT,
882 CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
883 ret = crypto_register_alg(&xts_aes_alg);
884 if (ret)
885 goto xts_aes_err;
886 }
887
888 if (crypt_s390_func_available(KMCTR_AES_128_ENCRYPT,
889 CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
890 crypt_s390_func_available(KMCTR_AES_192_ENCRYPT,
891 CRYPT_S390_MSA | CRYPT_S390_MSA4) &&
892 crypt_s390_func_available(KMCTR_AES_256_ENCRYPT,
893 CRYPT_S390_MSA | CRYPT_S390_MSA4)) {
894 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
895 if (!ctrblk) {
896 ret = -ENOMEM;
897 goto ctr_aes_err;
898 }
899 ret = crypto_register_alg(&ctr_aes_alg);
900 if (ret) {
901 free_page((unsigned long) ctrblk);
902 goto ctr_aes_err;
903 }
904 }
905
906 out:
907 return ret;
908
909 ctr_aes_err:
910 crypto_unregister_alg(&xts_aes_alg);
911 xts_aes_err:
912 crypto_unregister_alg(&cbc_aes_alg);
913 cbc_aes_err:
914 crypto_unregister_alg(&ecb_aes_alg);
915 ecb_aes_err:
916 crypto_unregister_alg(&aes_alg);
917 aes_err:
918 goto out;
919 }
920
921 static void __exit aes_s390_fini(void)
922 {
923 crypto_unregister_alg(&ctr_aes_alg);
924 free_page((unsigned long) ctrblk);
925 crypto_unregister_alg(&xts_aes_alg);
926 crypto_unregister_alg(&cbc_aes_alg);
927 crypto_unregister_alg(&ecb_aes_alg);
928 crypto_unregister_alg(&aes_alg);
929 }
930
931 module_init(aes_s390_init);
932 module_exit(aes_s390_fini);
933
934 MODULE_ALIAS("aes-all");
935
936 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
937 MODULE_LICENSE("GPL");