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staging: lustre: ldlm: change "int" to proper enum type
[linux-2.6/btrfs-unstable.git] / arch / s390 / crypto / aes_s390.c
blob303d28eb03a2f697b5ceb18c25cf8a72df4caf4d
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 <crypto/internal/skcipher.h>
26 #include <linux/err.h>
27 #include <linux/module.h>
28 #include <linux/cpufeature.h>
29 #include <linux/init.h>
30 #include <linux/spinlock.h>
31 #include <crypto/xts.h>
32 #include <asm/cpacf.h>
33
34 static u8 *ctrblk;
35 static DEFINE_SPINLOCK(ctrblk_lock);
36
37 static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
38
39 struct s390_aes_ctx {
40 u8 key[AES_MAX_KEY_SIZE];
41 int key_len;
42 unsigned long fc;
43 union {
44 struct crypto_skcipher *blk;
45 struct crypto_cipher *cip;
46 } fallback;
47 };
48
49 struct s390_xts_ctx {
50 u8 key[32];
51 u8 pcc_key[32];
52 int key_len;
53 unsigned long fc;
54 struct crypto_skcipher *fallback;
55 };
56
57 static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key,
58 unsigned int key_len)
59 {
60 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
61 int ret;
62
63 sctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
64 sctx->fallback.cip->base.crt_flags |= (tfm->crt_flags &
65 CRYPTO_TFM_REQ_MASK);
66
67 ret = crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len);
68 if (ret) {
69 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
70 tfm->crt_flags |= (sctx->fallback.cip->base.crt_flags &
71 CRYPTO_TFM_RES_MASK);
72 }
73 return ret;
74 }
75
76 static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
77 unsigned int key_len)
78 {
79 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
80 unsigned long fc;
81
82 /* Pick the correct function code based on the key length */
83 fc = (key_len == 16) ? CPACF_KM_AES_128 :
84 (key_len == 24) ? CPACF_KM_AES_192 :
85 (key_len == 32) ? CPACF_KM_AES_256 : 0;
86
87 /* Check if the function code is available */
88 sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
89 if (!sctx->fc)
90 return setkey_fallback_cip(tfm, in_key, key_len);
91
92 sctx->key_len = key_len;
93 memcpy(sctx->key, in_key, key_len);
94 return 0;
95 }
96
97 static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
98 {
99 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
100
101 if (unlikely(!sctx->fc)) {
102 crypto_cipher_encrypt_one(sctx->fallback.cip, out, in);
103 return;
104 }
105 cpacf_km(sctx->fc, &sctx->key, out, in, AES_BLOCK_SIZE);
106 }
107
108 static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
109 {
110 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
111
112 if (unlikely(!sctx->fc)) {
113 crypto_cipher_decrypt_one(sctx->fallback.cip, out, in);
114 return;
115 }
116 cpacf_km(sctx->fc | CPACF_DECRYPT,
117 &sctx->key, out, in, AES_BLOCK_SIZE);
118 }
119
120 static int fallback_init_cip(struct crypto_tfm *tfm)
121 {
122 const char *name = tfm->__crt_alg->cra_name;
123 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
124
125 sctx->fallback.cip = crypto_alloc_cipher(name, 0,
126 CRYPTO_ALG_ASYNC | CRYPTO_ALG_NEED_FALLBACK);
127
128 if (IS_ERR(sctx->fallback.cip)) {
129 pr_err("Allocating AES fallback algorithm %s failed\n",
130 name);
131 return PTR_ERR(sctx->fallback.cip);
132 }
133
134 return 0;
135 }
136
137 static void fallback_exit_cip(struct crypto_tfm *tfm)
138 {
139 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
140
141 crypto_free_cipher(sctx->fallback.cip);
142 sctx->fallback.cip = NULL;
143 }
144
145 static struct crypto_alg aes_alg = {
146 .cra_name = "aes",
147 .cra_driver_name = "aes-s390",
148 .cra_priority = 300,
149 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
150 CRYPTO_ALG_NEED_FALLBACK,
151 .cra_blocksize = AES_BLOCK_SIZE,
152 .cra_ctxsize = sizeof(struct s390_aes_ctx),
153 .cra_module = THIS_MODULE,
154 .cra_init = fallback_init_cip,
155 .cra_exit = fallback_exit_cip,
156 .cra_u = {
157 .cipher = {
158 .cia_min_keysize = AES_MIN_KEY_SIZE,
159 .cia_max_keysize = AES_MAX_KEY_SIZE,
160 .cia_setkey = aes_set_key,
161 .cia_encrypt = aes_encrypt,
162 .cia_decrypt = aes_decrypt,
163 }
164 }
165 };
166
167 static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key,
168 unsigned int len)
169 {
170 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
171 unsigned int ret;
172
173 crypto_skcipher_clear_flags(sctx->fallback.blk, CRYPTO_TFM_REQ_MASK);
174 crypto_skcipher_set_flags(sctx->fallback.blk, tfm->crt_flags &
175 CRYPTO_TFM_REQ_MASK);
176
177 ret = crypto_skcipher_setkey(sctx->fallback.blk, key, len);
178
179 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
180 tfm->crt_flags |= crypto_skcipher_get_flags(sctx->fallback.blk) &
181 CRYPTO_TFM_RES_MASK;
182
183 return ret;
184 }
185
186 static int fallback_blk_dec(struct blkcipher_desc *desc,
187 struct scatterlist *dst, struct scatterlist *src,
188 unsigned int nbytes)
189 {
190 unsigned int ret;
191 struct crypto_blkcipher *tfm = desc->tfm;
192 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm);
193 SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
194
195 skcipher_request_set_tfm(req, sctx->fallback.blk);
196 skcipher_request_set_callback(req, desc->flags, NULL, NULL);
197 skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
198
199 ret = crypto_skcipher_decrypt(req);
200
201 skcipher_request_zero(req);
202 return ret;
203 }
204
205 static int fallback_blk_enc(struct blkcipher_desc *desc,
206 struct scatterlist *dst, struct scatterlist *src,
207 unsigned int nbytes)
208 {
209 unsigned int ret;
210 struct crypto_blkcipher *tfm = desc->tfm;
211 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm);
212 SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
213
214 skcipher_request_set_tfm(req, sctx->fallback.blk);
215 skcipher_request_set_callback(req, desc->flags, NULL, NULL);
216 skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
217
218 ret = crypto_skcipher_encrypt(req);
219 return ret;
220 }
221
222 static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
223 unsigned int key_len)
224 {
225 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
226 unsigned long fc;
227
228 /* Pick the correct function code based on the key length */
229 fc = (key_len == 16) ? CPACF_KM_AES_128 :
230 (key_len == 24) ? CPACF_KM_AES_192 :
231 (key_len == 32) ? CPACF_KM_AES_256 : 0;
232
233 /* Check if the function code is available */
234 sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
235 if (!sctx->fc)
236 return setkey_fallback_blk(tfm, in_key, key_len);
237
238 sctx->key_len = key_len;
239 memcpy(sctx->key, in_key, key_len);
240 return 0;
241 }
242
243 static int ecb_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
244 struct blkcipher_walk *walk)
245 {
246 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
247 unsigned int nbytes, n;
248 int ret;
249
250 ret = blkcipher_walk_virt(desc, walk);
251 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
252 /* only use complete blocks */
253 n = nbytes & ~(AES_BLOCK_SIZE - 1);
254 cpacf_km(sctx->fc | modifier, sctx->key,
255 walk->dst.virt.addr, walk->src.virt.addr, n);
256 ret = blkcipher_walk_done(desc, walk, nbytes - n);
257 }
258
259 return ret;
260 }
261
262 static int ecb_aes_encrypt(struct blkcipher_desc *desc,
263 struct scatterlist *dst, struct scatterlist *src,
264 unsigned int nbytes)
265 {
266 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
267 struct blkcipher_walk walk;
268
269 if (unlikely(!sctx->fc))
270 return fallback_blk_enc(desc, dst, src, nbytes);
271
272 blkcipher_walk_init(&walk, dst, src, nbytes);
273 return ecb_aes_crypt(desc, 0, &walk);
274 }
275
276 static int ecb_aes_decrypt(struct blkcipher_desc *desc,
277 struct scatterlist *dst, struct scatterlist *src,
278 unsigned int nbytes)
279 {
280 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
281 struct blkcipher_walk walk;
282
283 if (unlikely(!sctx->fc))
284 return fallback_blk_dec(desc, dst, src, nbytes);
285
286 blkcipher_walk_init(&walk, dst, src, nbytes);
287 return ecb_aes_crypt(desc, CPACF_DECRYPT, &walk);
288 }
289
290 static int fallback_init_blk(struct crypto_tfm *tfm)
291 {
292 const char *name = tfm->__crt_alg->cra_name;
293 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
294
295 sctx->fallback.blk = crypto_alloc_skcipher(name, 0,
296 CRYPTO_ALG_ASYNC |
297 CRYPTO_ALG_NEED_FALLBACK);
298
299 if (IS_ERR(sctx->fallback.blk)) {
300 pr_err("Allocating AES fallback algorithm %s failed\n",
301 name);
302 return PTR_ERR(sctx->fallback.blk);
303 }
304
305 return 0;
306 }
307
308 static void fallback_exit_blk(struct crypto_tfm *tfm)
309 {
310 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
311
312 crypto_free_skcipher(sctx->fallback.blk);
313 }
314
315 static struct crypto_alg ecb_aes_alg = {
316 .cra_name = "ecb(aes)",
317 .cra_driver_name = "ecb-aes-s390",
318 .cra_priority = 400, /* combo: aes + ecb */
319 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
320 CRYPTO_ALG_NEED_FALLBACK,
321 .cra_blocksize = AES_BLOCK_SIZE,
322 .cra_ctxsize = sizeof(struct s390_aes_ctx),
323 .cra_type = &crypto_blkcipher_type,
324 .cra_module = THIS_MODULE,
325 .cra_init = fallback_init_blk,
326 .cra_exit = fallback_exit_blk,
327 .cra_u = {
328 .blkcipher = {
329 .min_keysize = AES_MIN_KEY_SIZE,
330 .max_keysize = AES_MAX_KEY_SIZE,
331 .setkey = ecb_aes_set_key,
332 .encrypt = ecb_aes_encrypt,
333 .decrypt = ecb_aes_decrypt,
334 }
335 }
336 };
337
338 static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
339 unsigned int key_len)
340 {
341 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
342 unsigned long fc;
343
344 /* Pick the correct function code based on the key length */
345 fc = (key_len == 16) ? CPACF_KMC_AES_128 :
346 (key_len == 24) ? CPACF_KMC_AES_192 :
347 (key_len == 32) ? CPACF_KMC_AES_256 : 0;
348
349 /* Check if the function code is available */
350 sctx->fc = (fc && cpacf_test_func(&kmc_functions, fc)) ? fc : 0;
351 if (!sctx->fc)
352 return setkey_fallback_blk(tfm, in_key, key_len);
353
354 sctx->key_len = key_len;
355 memcpy(sctx->key, in_key, key_len);
356 return 0;
357 }
358
359 static int cbc_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
360 struct blkcipher_walk *walk)
361 {
362 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
363 unsigned int nbytes, n;
364 int ret;
365 struct {
366 u8 iv[AES_BLOCK_SIZE];
367 u8 key[AES_MAX_KEY_SIZE];
368 } param;
369
370 ret = blkcipher_walk_virt(desc, walk);
371 memcpy(param.iv, walk->iv, AES_BLOCK_SIZE);
372 memcpy(param.key, sctx->key, sctx->key_len);
373 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
374 /* only use complete blocks */
375 n = nbytes & ~(AES_BLOCK_SIZE - 1);
376 cpacf_kmc(sctx->fc | modifier, &param,
377 walk->dst.virt.addr, walk->src.virt.addr, n);
378 ret = blkcipher_walk_done(desc, walk, nbytes - n);
379 }
380 memcpy(walk->iv, param.iv, AES_BLOCK_SIZE);
381 return ret;
382 }
383
384 static int cbc_aes_encrypt(struct blkcipher_desc *desc,
385 struct scatterlist *dst, struct scatterlist *src,
386 unsigned int nbytes)
387 {
388 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
389 struct blkcipher_walk walk;
390
391 if (unlikely(!sctx->fc))
392 return fallback_blk_enc(desc, dst, src, nbytes);
393
394 blkcipher_walk_init(&walk, dst, src, nbytes);
395 return cbc_aes_crypt(desc, 0, &walk);
396 }
397
398 static int cbc_aes_decrypt(struct blkcipher_desc *desc,
399 struct scatterlist *dst, struct scatterlist *src,
400 unsigned int nbytes)
401 {
402 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
403 struct blkcipher_walk walk;
404
405 if (unlikely(!sctx->fc))
406 return fallback_blk_dec(desc, dst, src, nbytes);
407
408 blkcipher_walk_init(&walk, dst, src, nbytes);
409 return cbc_aes_crypt(desc, CPACF_DECRYPT, &walk);
410 }
411
412 static struct crypto_alg cbc_aes_alg = {
413 .cra_name = "cbc(aes)",
414 .cra_driver_name = "cbc-aes-s390",
415 .cra_priority = 400, /* combo: aes + cbc */
416 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
417 CRYPTO_ALG_NEED_FALLBACK,
418 .cra_blocksize = AES_BLOCK_SIZE,
419 .cra_ctxsize = sizeof(struct s390_aes_ctx),
420 .cra_type = &crypto_blkcipher_type,
421 .cra_module = THIS_MODULE,
422 .cra_init = fallback_init_blk,
423 .cra_exit = fallback_exit_blk,
424 .cra_u = {
425 .blkcipher = {
426 .min_keysize = AES_MIN_KEY_SIZE,
427 .max_keysize = AES_MAX_KEY_SIZE,
428 .ivsize = AES_BLOCK_SIZE,
429 .setkey = cbc_aes_set_key,
430 .encrypt = cbc_aes_encrypt,
431 .decrypt = cbc_aes_decrypt,
432 }
433 }
434 };
435
436 static int xts_fallback_setkey(struct crypto_tfm *tfm, const u8 *key,
437 unsigned int len)
438 {
439 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
440 unsigned int ret;
441
442 crypto_skcipher_clear_flags(xts_ctx->fallback, CRYPTO_TFM_REQ_MASK);
443 crypto_skcipher_set_flags(xts_ctx->fallback, tfm->crt_flags &
444 CRYPTO_TFM_REQ_MASK);
445
446 ret = crypto_skcipher_setkey(xts_ctx->fallback, key, len);
447
448 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
449 tfm->crt_flags |= crypto_skcipher_get_flags(xts_ctx->fallback) &
450 CRYPTO_TFM_RES_MASK;
451
452 return ret;
453 }
454
455 static int xts_fallback_decrypt(struct blkcipher_desc *desc,
456 struct scatterlist *dst, struct scatterlist *src,
457 unsigned int nbytes)
458 {
459 struct crypto_blkcipher *tfm = desc->tfm;
460 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm);
461 SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
462 unsigned int ret;
463
464 skcipher_request_set_tfm(req, xts_ctx->fallback);
465 skcipher_request_set_callback(req, desc->flags, NULL, NULL);
466 skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
467
468 ret = crypto_skcipher_decrypt(req);
469
470 skcipher_request_zero(req);
471 return ret;
472 }
473
474 static int xts_fallback_encrypt(struct blkcipher_desc *desc,
475 struct scatterlist *dst, struct scatterlist *src,
476 unsigned int nbytes)
477 {
478 struct crypto_blkcipher *tfm = desc->tfm;
479 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm);
480 SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
481 unsigned int ret;
482
483 skcipher_request_set_tfm(req, xts_ctx->fallback);
484 skcipher_request_set_callback(req, desc->flags, NULL, NULL);
485 skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
486
487 ret = crypto_skcipher_encrypt(req);
488
489 skcipher_request_zero(req);
490 return ret;
491 }
492
493 static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
494 unsigned int key_len)
495 {
496 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
497 unsigned long fc;
498 int err;
499
500 err = xts_check_key(tfm, in_key, key_len);
501 if (err)
502 return err;
503
504 /* Pick the correct function code based on the key length */
505 fc = (key_len == 32) ? CPACF_KM_XTS_128 :
506 (key_len == 64) ? CPACF_KM_XTS_256 : 0;
507
508 /* Check if the function code is available */
509 xts_ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
510 if (!xts_ctx->fc)
511 return xts_fallback_setkey(tfm, in_key, key_len);
512
513 /* Split the XTS key into the two subkeys */
514 key_len = key_len / 2;
515 xts_ctx->key_len = key_len;
516 memcpy(xts_ctx->key, in_key, key_len);
517 memcpy(xts_ctx->pcc_key, in_key + key_len, key_len);
518 return 0;
519 }
520
521 static int xts_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
522 struct blkcipher_walk *walk)
523 {
524 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
525 unsigned int offset, nbytes, n;
526 int ret;
527 struct {
528 u8 key[32];
529 u8 tweak[16];
530 u8 block[16];
531 u8 bit[16];
532 u8 xts[16];
533 } pcc_param;
534 struct {
535 u8 key[32];
536 u8 init[16];
537 } xts_param;
538
539 ret = blkcipher_walk_virt(desc, walk);
540 offset = xts_ctx->key_len & 0x10;
541 memset(pcc_param.block, 0, sizeof(pcc_param.block));
542 memset(pcc_param.bit, 0, sizeof(pcc_param.bit));
543 memset(pcc_param.xts, 0, sizeof(pcc_param.xts));
544 memcpy(pcc_param.tweak, walk->iv, sizeof(pcc_param.tweak));
545 memcpy(pcc_param.key + offset, xts_ctx->pcc_key, xts_ctx->key_len);
546 cpacf_pcc(xts_ctx->fc, pcc_param.key + offset);
547
548 memcpy(xts_param.key + offset, xts_ctx->key, xts_ctx->key_len);
549 memcpy(xts_param.init, pcc_param.xts, 16);
550
551 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
552 /* only use complete blocks */
553 n = nbytes & ~(AES_BLOCK_SIZE - 1);
554 cpacf_km(xts_ctx->fc | modifier, xts_param.key + offset,
555 walk->dst.virt.addr, walk->src.virt.addr, n);
556 ret = blkcipher_walk_done(desc, walk, nbytes - n);
557 }
558 return ret;
559 }
560
561 static int xts_aes_encrypt(struct blkcipher_desc *desc,
562 struct scatterlist *dst, struct scatterlist *src,
563 unsigned int nbytes)
564 {
565 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
566 struct blkcipher_walk walk;
567
568 if (unlikely(!xts_ctx->fc))
569 return xts_fallback_encrypt(desc, dst, src, nbytes);
570
571 blkcipher_walk_init(&walk, dst, src, nbytes);
572 return xts_aes_crypt(desc, 0, &walk);
573 }
574
575 static int xts_aes_decrypt(struct blkcipher_desc *desc,
576 struct scatterlist *dst, struct scatterlist *src,
577 unsigned int nbytes)
578 {
579 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
580 struct blkcipher_walk walk;
581
582 if (unlikely(!xts_ctx->fc))
583 return xts_fallback_decrypt(desc, dst, src, nbytes);
584
585 blkcipher_walk_init(&walk, dst, src, nbytes);
586 return xts_aes_crypt(desc, CPACF_DECRYPT, &walk);
587 }
588
589 static int xts_fallback_init(struct crypto_tfm *tfm)
590 {
591 const char *name = tfm->__crt_alg->cra_name;
592 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
593
594 xts_ctx->fallback = crypto_alloc_skcipher(name, 0,
595 CRYPTO_ALG_ASYNC |
596 CRYPTO_ALG_NEED_FALLBACK);
597
598 if (IS_ERR(xts_ctx->fallback)) {
599 pr_err("Allocating XTS fallback algorithm %s failed\n",
600 name);
601 return PTR_ERR(xts_ctx->fallback);
602 }
603 return 0;
604 }
605
606 static void xts_fallback_exit(struct crypto_tfm *tfm)
607 {
608 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
609
610 crypto_free_skcipher(xts_ctx->fallback);
611 }
612
613 static struct crypto_alg xts_aes_alg = {
614 .cra_name = "xts(aes)",
615 .cra_driver_name = "xts-aes-s390",
616 .cra_priority = 400, /* combo: aes + xts */
617 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
618 CRYPTO_ALG_NEED_FALLBACK,
619 .cra_blocksize = AES_BLOCK_SIZE,
620 .cra_ctxsize = sizeof(struct s390_xts_ctx),
621 .cra_type = &crypto_blkcipher_type,
622 .cra_module = THIS_MODULE,
623 .cra_init = xts_fallback_init,
624 .cra_exit = xts_fallback_exit,
625 .cra_u = {
626 .blkcipher = {
627 .min_keysize = 2 * AES_MIN_KEY_SIZE,
628 .max_keysize = 2 * AES_MAX_KEY_SIZE,
629 .ivsize = AES_BLOCK_SIZE,
630 .setkey = xts_aes_set_key,
631 .encrypt = xts_aes_encrypt,
632 .decrypt = xts_aes_decrypt,
633 }
634 }
635 };
636
637 static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
638 unsigned int key_len)
639 {
640 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
641 unsigned long fc;
642
643 /* Pick the correct function code based on the key length */
644 fc = (key_len == 16) ? CPACF_KMCTR_AES_128 :
645 (key_len == 24) ? CPACF_KMCTR_AES_192 :
646 (key_len == 32) ? CPACF_KMCTR_AES_256 : 0;
647
648 /* Check if the function code is available */
649 sctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0;
650 if (!sctx->fc)
651 return setkey_fallback_blk(tfm, in_key, key_len);
652
653 sctx->key_len = key_len;
654 memcpy(sctx->key, in_key, key_len);
655 return 0;
656 }
657
658 static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
659 {
660 unsigned int i, n;
661
662 /* only use complete blocks, max. PAGE_SIZE */
663 memcpy(ctrptr, iv, AES_BLOCK_SIZE);
664 n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);
665 for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) {
666 memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE);
667 crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE);
668 ctrptr += AES_BLOCK_SIZE;
669 }
670 return n;
671 }
672
673 static int ctr_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
674 struct blkcipher_walk *walk)
675 {
676 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
677 u8 buf[AES_BLOCK_SIZE], *ctrptr;
678 unsigned int n, nbytes;
679 int ret, locked;
680
681 locked = spin_trylock(&ctrblk_lock);
682
683 ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
684 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
685 n = AES_BLOCK_SIZE;
686 if (nbytes >= 2*AES_BLOCK_SIZE && locked)
687 n = __ctrblk_init(ctrblk, walk->iv, nbytes);
688 ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk->iv;
689 cpacf_kmctr(sctx->fc | modifier, sctx->key,
690 walk->dst.virt.addr, walk->src.virt.addr,
691 n, ctrptr);
692 if (ctrptr == ctrblk)
693 memcpy(walk->iv, ctrptr + n - AES_BLOCK_SIZE,
694 AES_BLOCK_SIZE);
695 crypto_inc(walk->iv, AES_BLOCK_SIZE);
696 ret = blkcipher_walk_done(desc, walk, nbytes - n);
697 }
698 if (locked)
699 spin_unlock(&ctrblk_lock);
700 /*
701 * final block may be < AES_BLOCK_SIZE, copy only nbytes
702 */
703 if (nbytes) {
704 cpacf_kmctr(sctx->fc | modifier, sctx->key,
705 buf, walk->src.virt.addr,
706 AES_BLOCK_SIZE, walk->iv);
707 memcpy(walk->dst.virt.addr, buf, nbytes);
708 crypto_inc(walk->iv, AES_BLOCK_SIZE);
709 ret = blkcipher_walk_done(desc, walk, 0);
710 }
711
712 return ret;
713 }
714
715 static int ctr_aes_encrypt(struct blkcipher_desc *desc,
716 struct scatterlist *dst, struct scatterlist *src,
717 unsigned int nbytes)
718 {
719 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
720 struct blkcipher_walk walk;
721
722 if (unlikely(!sctx->fc))
723 return fallback_blk_enc(desc, dst, src, nbytes);
724
725 blkcipher_walk_init(&walk, dst, src, nbytes);
726 return ctr_aes_crypt(desc, 0, &walk);
727 }
728
729 static int ctr_aes_decrypt(struct blkcipher_desc *desc,
730 struct scatterlist *dst, struct scatterlist *src,
731 unsigned int nbytes)
732 {
733 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
734 struct blkcipher_walk walk;
735
736 if (unlikely(!sctx->fc))
737 return fallback_blk_dec(desc, dst, src, nbytes);
738
739 blkcipher_walk_init(&walk, dst, src, nbytes);
740 return ctr_aes_crypt(desc, CPACF_DECRYPT, &walk);
741 }
742
743 static struct crypto_alg ctr_aes_alg = {
744 .cra_name = "ctr(aes)",
745 .cra_driver_name = "ctr-aes-s390",
746 .cra_priority = 400, /* combo: aes + ctr */
747 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
748 CRYPTO_ALG_NEED_FALLBACK,
749 .cra_blocksize = 1,
750 .cra_ctxsize = sizeof(struct s390_aes_ctx),
751 .cra_type = &crypto_blkcipher_type,
752 .cra_module = THIS_MODULE,
753 .cra_init = fallback_init_blk,
754 .cra_exit = fallback_exit_blk,
755 .cra_u = {
756 .blkcipher = {
757 .min_keysize = AES_MIN_KEY_SIZE,
758 .max_keysize = AES_MAX_KEY_SIZE,
759 .ivsize = AES_BLOCK_SIZE,
760 .setkey = ctr_aes_set_key,
761 .encrypt = ctr_aes_encrypt,
762 .decrypt = ctr_aes_decrypt,
763 }
764 }
765 };
766
767 static struct crypto_alg *aes_s390_algs_ptr[5];
768 static int aes_s390_algs_num;
769
770 static int aes_s390_register_alg(struct crypto_alg *alg)
771 {
772 int ret;
773
774 ret = crypto_register_alg(alg);
775 if (!ret)
776 aes_s390_algs_ptr[aes_s390_algs_num++] = alg;
777 return ret;
778 }
779
780 static void aes_s390_fini(void)
781 {
782 while (aes_s390_algs_num--)
783 crypto_unregister_alg(aes_s390_algs_ptr[aes_s390_algs_num]);
784 if (ctrblk)
785 free_page((unsigned long) ctrblk);
786 }
787
788 static int __init aes_s390_init(void)
789 {
790 int ret;
791
792 /* Query available functions for KM, KMC and KMCTR */
793 cpacf_query(CPACF_KM, &km_functions);
794 cpacf_query(CPACF_KMC, &kmc_functions);
795 cpacf_query(CPACF_KMCTR, &kmctr_functions);
796
797 if (cpacf_test_func(&km_functions, CPACF_KM_AES_128) ||
798 cpacf_test_func(&km_functions, CPACF_KM_AES_192) ||
799 cpacf_test_func(&km_functions, CPACF_KM_AES_256)) {
800 ret = aes_s390_register_alg(&aes_alg);
801 if (ret)
802 goto out_err;
803 ret = aes_s390_register_alg(&ecb_aes_alg);
804 if (ret)
805 goto out_err;
806 }
807
808 if (cpacf_test_func(&kmc_functions, CPACF_KMC_AES_128) ||
809 cpacf_test_func(&kmc_functions, CPACF_KMC_AES_192) ||
810 cpacf_test_func(&kmc_functions, CPACF_KMC_AES_256)) {
811 ret = aes_s390_register_alg(&cbc_aes_alg);
812 if (ret)
813 goto out_err;
814 }
815
816 if (cpacf_test_func(&km_functions, CPACF_KM_XTS_128) ||
817 cpacf_test_func(&km_functions, CPACF_KM_XTS_256)) {
818 ret = aes_s390_register_alg(&xts_aes_alg);
819 if (ret)
820 goto out_err;
821 }
822
823 if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_128) ||
824 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_192) ||
825 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_256)) {
826 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
827 if (!ctrblk) {
828 ret = -ENOMEM;
829 goto out_err;
830 }
831 ret = aes_s390_register_alg(&ctr_aes_alg);
832 if (ret)
833 goto out_err;
834 }
835
836 return 0;
837 out_err:
838 aes_s390_fini();
839 return ret;
840 }
841
842 module_cpu_feature_match(MSA, aes_s390_init);
843 module_exit(aes_s390_fini);
844
845 MODULE_ALIAS_CRYPTO("aes-all");
846
847 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
848 MODULE_LICENSE("GPL");
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