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crypto: prefix module autoloading with "crypto-"
[deliverable/linux.git] / arch / s390 / crypto / aes_s390.c
CommitLineData
bf754ae8
JG		 1/*
2 * Cryptographic API.
3 *
4 * s390 implementation of the AES Cipher Algorithm.
5 *
6 * s390 Version:
a53c8fab 7 * Copyright IBM Corp. 2005, 2007
bf754ae8 8 * Author(s): Jan Glauber (jang@de.ibm.com)
b0c3e75d 9 * Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback
bf754ae8 10 *
f8246af0 11 * Derived from "crypto/aes_generic.c"
bf754ae8
JG		 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
39f09392
JG		 20#define KMSG_COMPONENT "aes_s390"
21#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
22
89e12654 23#include <crypto/aes.h>
a9e62fad 24#include <crypto/algapi.h>
b0c3e75d 25#include <linux/err.h>
bf754ae8
JG		 26#include <linux/module.h>
27#include <linux/init.h>
0519e9ad 28#include <linux/spinlock.h>
bf754ae8
JG		 29#include "crypt_s390.h"
30
86aa9fc2
JG		 31#define AES_KEYLEN_128 1
32#define AES_KEYLEN_192 2
33#define AES_KEYLEN_256 4
34
0200f3ec 35static u8 *ctrblk;
0519e9ad 36static DEFINE_SPINLOCK(ctrblk_lock);
0200f3ec 37static char keylen_flag;
bf754ae8
JG		 38
39struct s390_aes_ctx {
bf754ae8 40 u8 key[AES_MAX_KEY_SIZE];
a9e62fad
HX		 41 long enc;
42 long dec;
bf754ae8 43 int key_len;
b0c3e75d
SS		 44 union {
45 struct crypto_blkcipher *blk;
46 struct crypto_cipher *cip;
47 } fallback;
bf754ae8
JG		 48};
49
99d97222
GS		 50struct pcc_param {
51 u8 key[32];
52 u8 tweak[16];
53 u8 block[16];
54 u8 bit[16];
55 u8 xts[16];
56};
57
58struct s390_xts_ctx {
59 u8 key[32];
9dda2769 60 u8 pcc_key[32];
99d97222
GS		 61 long enc;
62 long dec;
63 int key_len;
64 struct crypto_blkcipher *fallback;
65};
66
b0c3e75d
SS		 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 */
72static int need_fallback(unsigned int key_len)
bf754ae8 73{
bf754ae8
JG		 74 switch (key_len) {
75 case 16:
86aa9fc2 76 if (!(keylen_flag & AES_KEYLEN_128))
b0c3e75d 77 return 1;
bf754ae8
JG		 78 break;
79 case 24:
86aa9fc2 80 if (!(keylen_flag & AES_KEYLEN_192))
b0c3e75d 81 return 1;
bf754ae8
JG		 82 break;
83 case 32:
86aa9fc2 84 if (!(keylen_flag & AES_KEYLEN_256))
b0c3e75d 85 return 1;
bf754ae8
JG		 86 break;
87 default:
b0c3e75d 88 return -1;
bf754ae8
JG		 89 break;
90 }
b0c3e75d
SS		 91 return 0;
92}
93
94static 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
d7ac7690
RK		 100 sctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
101 sctx->fallback.cip->base.crt_flags |= (tfm->crt_flags &
b0c3e75d
SS		 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;
d7ac7690 107 tfm->crt_flags |= (sctx->fallback.cip->base.crt_flags &
b0c3e75d
SS		 108 CRYPTO_TFM_RES_MASK);
109 }
110 return ret;
111}
112
113static 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 }
bf754ae8
JG		 125
126 sctx->key_len = key_len;
b0c3e75d
SS		 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);
bf754ae8
JG		 133}
134
6c2bb98b 135static void aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
bf754ae8 136{
6c2bb98b 137 const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
bf754ae8 138
b0c3e75d
SS		 139 if (unlikely(need_fallback(sctx->key_len))) {
140 crypto_cipher_encrypt_one(sctx->fallback.cip, out, in);
141 return;
142 }
143
bf754ae8
JG		 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
6c2bb98b 160static void aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
bf754ae8 161{
6c2bb98b 162 const struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
bf754ae8 163
b0c3e75d
SS		 164 if (unlikely(need_fallback(sctx->key_len))) {
165 crypto_cipher_decrypt_one(sctx->fallback.cip, out, in);
166 return;
167 }
168
bf754ae8
JG		 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
b0c3e75d
SS		 185static 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)) {
39f09392
JG		 194 pr_err("Allocating AES fallback algorithm %s failed\n",
195 name);
b59cdcb3 196 return PTR_ERR(sctx->fallback.cip);
b0c3e75d
SS		 197 }
198
199 return 0;
200}
201
202static 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}
bf754ae8
JG		 209
210static struct crypto_alg aes_alg = {
211 .cra_name = "aes",
65b75c36
HX		 212 .cra_driver_name = "aes-s390",
213 .cra_priority = CRYPT_S390_PRIORITY,
f67d1369
JG		 214 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
215 CRYPTO_ALG_NEED_FALLBACK,
bf754ae8
JG		 216 .cra_blocksize = AES_BLOCK_SIZE,
217 .cra_ctxsize = sizeof(struct s390_aes_ctx),
218 .cra_module = THIS_MODULE,
b0c3e75d
SS		 219 .cra_init = fallback_init_cip,
220 .cra_exit = fallback_exit_cip,
bf754ae8
JG		 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,
bf754ae8
JG		 228 }
229 }
230};
231
b0c3e75d
SS		 232static 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
251static 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
b0c3e75d
SS		 259 tfm = desc->tfm;
260 desc->tfm = sctx->fallback.blk;
261
2d74d405 262 ret = crypto_blkcipher_decrypt_iv(desc, dst, src, nbytes);
b0c3e75d
SS		 263
264 desc->tfm = tfm;
265 return ret;
266}
267
268static 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
b0c3e75d
SS		 276 tfm = desc->tfm;
277 desc->tfm = sctx->fallback.blk;
278
2d74d405 279 ret = crypto_blkcipher_encrypt_iv(desc, dst, src, nbytes);
b0c3e75d
SS		 280
281 desc->tfm = tfm;
282 return ret;
283}
284
a9e62fad
HX		 285static 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);
b0c3e75d
SS		 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 }
a9e62fad
HX		 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
315static 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);
36eb2caa
JG		 328 if (ret < 0 || ret != n)
329 return -EIO;
a9e62fad
HX		 330
331 nbytes &= AES_BLOCK_SIZE - 1;
332 ret = blkcipher_walk_done(desc, walk, nbytes);
333 }
334
335 return ret;
336}
337
338static 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
b0c3e75d
SS		 345 if (unlikely(need_fallback(sctx->key_len)))
346 return fallback_blk_enc(desc, dst, src, nbytes);
347
a9e62fad
HX		 348 blkcipher_walk_init(&walk, dst, src, nbytes);
349 return ecb_aes_crypt(desc, sctx->enc, sctx->key, &walk);
350}
351
352static 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
b0c3e75d
SS		 359 if (unlikely(need_fallback(sctx->key_len)))
360 return fallback_blk_dec(desc, dst, src, nbytes);
361
a9e62fad
HX		 362 blkcipher_walk_init(&walk, dst, src, nbytes);
363 return ecb_aes_crypt(desc, sctx->dec, sctx->key, &walk);
364}
365
b0c3e75d
SS		 366static 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)) {
39f09392
JG		 375 pr_err("Allocating AES fallback algorithm %s failed\n",
376 name);
b0c3e75d
SS		 377 return PTR_ERR(sctx->fallback.blk);
378 }
379
380 return 0;
381}
382
383static 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
a9e62fad
HX		 391static 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,
f67d1369
JG		 395 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
396 CRYPTO_ALG_NEED_FALLBACK,
a9e62fad
HX		 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,
b0c3e75d
SS		 401 .cra_init = fallback_init_blk,
402 .cra_exit = fallback_exit_blk,
a9e62fad
HX		 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
414static 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);
b0c3e75d
SS		 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 }
a9e62fad
HX		 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
f262f0f5 444static int cbc_aes_crypt(struct blkcipher_desc *desc, long func,
a9e62fad
HX		 445 struct blkcipher_walk *walk)
446{
f262f0f5 447 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
a9e62fad
HX		 448 int ret = blkcipher_walk_virt(desc, walk);
449 unsigned int nbytes = walk->nbytes;
f262f0f5
HX		 450 struct {
451 u8 iv[AES_BLOCK_SIZE];
452 u8 key[AES_MAX_KEY_SIZE];
453 } param;
a9e62fad
HX		 454
455 if (!nbytes)
456 goto out;
457
f262f0f5
HX		 458 memcpy(param.iv, walk->iv, AES_BLOCK_SIZE);
459 memcpy(param.key, sctx->key, sctx->key_len);
a9e62fad
HX		 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
f262f0f5 466 ret = crypt_s390_kmc(func, &param, out, in, n);
36eb2caa
JG		 467 if (ret < 0 || ret != n)
468 return -EIO;
a9e62fad
HX		 469
470 nbytes &= AES_BLOCK_SIZE - 1;
471 ret = blkcipher_walk_done(desc, walk, nbytes);
472 } while ((nbytes = walk->nbytes));
f262f0f5 473 memcpy(walk->iv, param.iv, AES_BLOCK_SIZE);
a9e62fad
HX		 474
475out:
476 return ret;
477}
478
479static 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
b0c3e75d
SS		 486 if (unlikely(need_fallback(sctx->key_len)))
487 return fallback_blk_enc(desc, dst, src, nbytes);
488
a9e62fad 489 blkcipher_walk_init(&walk, dst, src, nbytes);
f262f0f5 490 return cbc_aes_crypt(desc, sctx->enc, &walk);
a9e62fad
HX		 491}
492
493static 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
b0c3e75d
SS		 500 if (unlikely(need_fallback(sctx->key_len)))
501 return fallback_blk_dec(desc, dst, src, nbytes);
502
a9e62fad 503 blkcipher_walk_init(&walk, dst, src, nbytes);
f262f0f5 504 return cbc_aes_crypt(desc, sctx->dec, &walk);
a9e62fad
HX		 505}
506
507static 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,
f67d1369
JG		 511 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
512 CRYPTO_ALG_NEED_FALLBACK,
a9e62fad
HX		 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,
b0c3e75d
SS		 517 .cra_init = fallback_init_blk,
518 .cra_exit = fallback_exit_blk,
a9e62fad
HX		 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
99d97222
GS		 531static 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
550static 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
567static 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
584static 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);
9dda2769 595 memcpy(xts_ctx->pcc_key + 16, in_key + 16, 16);
99d97222
GS		 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);
9dda2769 606 memcpy(xts_ctx->pcc_key, in_key + 32, 32);
99d97222
GS		 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
616static 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;
9dda2769
GS		 625 struct pcc_param pcc_param;
626 struct {
627 u8 key[32];
628 u8 init[16];
629 } xts_param;
99d97222
GS		 630
631 if (!nbytes)
632 goto out;
633
9dda2769
GS		 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]);
36eb2caa
JG		 640 if (ret < 0)
641 return -EIO;
99d97222 642
9dda2769
GS		 643 memcpy(xts_param.key, xts_ctx->key, 32);
644 memcpy(xts_param.init, pcc_param.xts, 16);
99d97222
GS		 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
9dda2769 651 ret = crypt_s390_km(func, &xts_param.key[offset], out, in, n);
36eb2caa
JG		 652 if (ret < 0 || ret != n)
653 return -EIO;
99d97222
GS		 654
655 nbytes &= AES_BLOCK_SIZE - 1;
656 ret = blkcipher_walk_done(desc, walk, nbytes);
657 } while ((nbytes = walk->nbytes));
658out:
659 return ret;
660}
661
662static 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
676static 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
690static 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
706static 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
714static 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,
99d97222
GS		 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
4f57ba71
IT		 738static int xts_aes_alg_reg;
739
0200f3ec
GS		 740static 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
0519e9ad
HF		 763static 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
0200f3ec
GS		 777static 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);
0519e9ad
HF		 781 unsigned int n, nbytes;
782 u8 buf[AES_BLOCK_SIZE], ctrbuf[AES_BLOCK_SIZE];
783 u8 *out, *in, *ctrptr = ctrbuf;
0200f3ec
GS		 784
785 if (!walk->nbytes)
786 return ret;
787
0519e9ad
HF		 788 if (spin_trylock(&ctrblk_lock))
789 ctrptr = ctrblk;
790
791 memcpy(ctrptr, walk->iv, AES_BLOCK_SIZE);
0200f3ec
GS		 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) {
0519e9ad
HF		 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);
36eb2caa 805 return -EIO;
0519e9ad 806 }
0200f3ec 807 if (n > AES_BLOCK_SIZE)
0519e9ad 808 memcpy(ctrptr, ctrptr + n - AES_BLOCK_SIZE,
0200f3ec 809 AES_BLOCK_SIZE);
0519e9ad 810 crypto_inc(ctrptr, AES_BLOCK_SIZE);
0200f3ec
GS		 811 out += n;
812 in += n;
813 nbytes -= n;
814 }
815 ret = blkcipher_walk_done(desc, walk, nbytes);
816 }
0519e9ad
HF		 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);
3901c112
HF		 823 } else {
824 if (!nbytes)
825 memcpy(walk->iv, ctrptr, AES_BLOCK_SIZE);
0519e9ad 826 }
0200f3ec
GS		 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,
0519e9ad 834 AES_BLOCK_SIZE, ctrbuf);
36eb2caa
JG		 835 if (ret < 0 || ret != AES_BLOCK_SIZE)
836 return -EIO;
0200f3ec 837 memcpy(out, buf, nbytes);
0519e9ad 838 crypto_inc(ctrbuf, AES_BLOCK_SIZE);
0200f3ec 839 ret = blkcipher_walk_done(desc, walk, 0);
0519e9ad 840 memcpy(walk->iv, ctrbuf, AES_BLOCK_SIZE);
0200f3ec 841 }
0519e9ad 842
0200f3ec
GS		 843 return ret;
844}
845
846static 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
857static 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
868static 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,
0200f3ec
GS		 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
4f57ba71
IT		 889static int ctr_aes_alg_reg;
890
9f7819c1 891static int __init aes_s390_init(void)
bf754ae8
JG		 892{
893 int ret;
894
1822bc90 895 if (crypt_s390_func_available(KM_AES_128_ENCRYPT, CRYPT_S390_MSA))
86aa9fc2 896 keylen_flag |= AES_KEYLEN_128;
1822bc90 897 if (crypt_s390_func_available(KM_AES_192_ENCRYPT, CRYPT_S390_MSA))
86aa9fc2 898 keylen_flag |= AES_KEYLEN_192;
1822bc90 899 if (crypt_s390_func_available(KM_AES_256_ENCRYPT, CRYPT_S390_MSA))
86aa9fc2
JG		 900 keylen_flag |= AES_KEYLEN_256;
901
902 if (!keylen_flag)
903 return -EOPNOTSUPP;
bf754ae8 904
86aa9fc2 905 /* z9 109 and z9 BC/EC only support 128 bit key length */
b0c3e75d 906 if (keylen_flag == AES_KEYLEN_128)
39f09392
JG		 907 pr_info("AES hardware acceleration is only available for"
908 " 128-bit keys\n");
bf754ae8
JG		 909
910 ret = crypto_register_alg(&aes_alg);
86aa9fc2 911 if (ret)
a9e62fad 912 goto aes_err;
a9e62fad
HX		 913
914 ret = crypto_register_alg(&ecb_aes_alg);
86aa9fc2 915 if (ret)
a9e62fad 916 goto ecb_aes_err;
a9e62fad
HX		 917
918 ret = crypto_register_alg(&cbc_aes_alg);
86aa9fc2 919 if (ret)
a9e62fad 920 goto cbc_aes_err;
a9e62fad 921
99d97222
GS		 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;
4f57ba71 929 xts_aes_alg_reg = 1;
99d97222
GS		 930 }
931
0200f3ec
GS		 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 }
4f57ba71 948 ctr_aes_alg_reg = 1;
0200f3ec
GS		 949 }
950
a9e62fad 951out:
bf754ae8 952 return ret;
a9e62fad 953
0200f3ec
GS		 954ctr_aes_err:
955 crypto_unregister_alg(&xts_aes_alg);
99d97222
GS		 956xts_aes_err:
957 crypto_unregister_alg(&cbc_aes_alg);
a9e62fad
HX		 958cbc_aes_err:
959 crypto_unregister_alg(&ecb_aes_alg);
960ecb_aes_err:
961 crypto_unregister_alg(&aes_alg);
962aes_err:
963 goto out;
bf754ae8
JG		 964}
965
9f7819c1 966static void __exit aes_s390_fini(void)
bf754ae8 967{
4f57ba71
IT		 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);
a9e62fad
HX		 974 crypto_unregister_alg(&cbc_aes_alg);
975 crypto_unregister_alg(&ecb_aes_alg);
bf754ae8
JG		 976 crypto_unregister_alg(&aes_alg);
977}
978
9f7819c1
HC		 979module_init(aes_s390_init);
980module_exit(aes_s390_fini);
bf754ae8 981
5d26a105 982MODULE_ALIAS_CRYPTO("aes-all");
bf754ae8
JG		 983
984MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
985MODULE_LICENSE("GPL");
Linux kernel - Deliverables
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