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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * Cryptographic API.
4 *
5 * s390 implementation of the AES Cipher Algorithm.
6 *
7 * s390 Version:
8 * Copyright IBM Corp. 2005, 2017
9 * Author(s): Jan Glauber (jang@de.ibm.com)
10 * Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback
11 * Patrick Steuer <patrick.steuer@de.ibm.com>
12 * Harald Freudenberger <freude@de.ibm.com>
13 *
14 * Derived from "crypto/aes_generic.c"
15 */
16
17#define KMSG_COMPONENT "aes_s390"
18#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
19
20#include <crypto/aes.h>
21#include <crypto/algapi.h>
22#include <crypto/ghash.h>
23#include <crypto/internal/aead.h>
24#include <crypto/internal/cipher.h>
25#include <crypto/internal/skcipher.h>
26#include <crypto/scatterwalk.h>
27#include <linux/err.h>
28#include <linux/module.h>
29#include <linux/cpufeature.h>
30#include <linux/init.h>
31#include <linux/mutex.h>
32#include <linux/fips.h>
33#include <linux/string.h>
34#include <crypto/xts.h>
35#include <asm/cpacf.h>
36
37static u8 *ctrblk;
38static DEFINE_MUTEX(ctrblk_lock);
39
40static cpacf_mask_t km_functions, kmc_functions, kmctr_functions,
41 kma_functions;
42
43struct s390_aes_ctx {
44 u8 key[AES_MAX_KEY_SIZE];
45 int key_len;
46 unsigned long fc;
47 union {
48 struct crypto_skcipher *skcipher;
49 struct crypto_cipher *cip;
50 } fallback;
51};
52
53struct s390_xts_ctx {
54 union {
55 u8 keys[64];
56 struct {
57 u8 key[32];
58 u8 pcc_key[32];
59 };
60 };
61 int key_len;
62 unsigned long fc;
63 struct crypto_skcipher *fallback;
64};
65
66struct gcm_sg_walk {
67 struct scatter_walk walk;
68 unsigned int walk_bytes;
69 u8 *walk_ptr;
70 unsigned int walk_bytes_remain;
71 u8 buf[AES_BLOCK_SIZE];
72 unsigned int buf_bytes;
73 u8 *ptr;
74 unsigned int nbytes;
75};
76
77static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key,
78 unsigned int key_len)
79{
80 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
81
82 sctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
83 sctx->fallback.cip->base.crt_flags |= (tfm->crt_flags &
84 CRYPTO_TFM_REQ_MASK);
85
86 return crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len);
87}
88
89static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
90 unsigned int key_len)
91{
92 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
93 unsigned long fc;
94
95 /* Pick the correct function code based on the key length */
96 fc = (key_len == 16) ? CPACF_KM_AES_128 :
97 (key_len == 24) ? CPACF_KM_AES_192 :
98 (key_len == 32) ? CPACF_KM_AES_256 : 0;
99
100 /* Check if the function code is available */
101 sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
102 if (!sctx->fc)
103 return setkey_fallback_cip(tfm, in_key, key_len);
104
105 sctx->key_len = key_len;
106 memcpy(sctx->key, in_key, key_len);
107 return 0;
108}
109
110static void crypto_aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
111{
112 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
113
114 if (unlikely(!sctx->fc)) {
115 crypto_cipher_encrypt_one(sctx->fallback.cip, out, in);
116 return;
117 }
118 cpacf_km(sctx->fc, &sctx->key, out, in, AES_BLOCK_SIZE);
119}
120
121static void crypto_aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
122{
123 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
124
125 if (unlikely(!sctx->fc)) {
126 crypto_cipher_decrypt_one(sctx->fallback.cip, out, in);
127 return;
128 }
129 cpacf_km(sctx->fc | CPACF_DECRYPT,
130 &sctx->key, out, in, AES_BLOCK_SIZE);
131}
132
133static int fallback_init_cip(struct crypto_tfm *tfm)
134{
135 const char *name = tfm->__crt_alg->cra_name;
136 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
137
138 sctx->fallback.cip = crypto_alloc_cipher(name, 0,
139 CRYPTO_ALG_NEED_FALLBACK);
140
141 if (IS_ERR(sctx->fallback.cip)) {
142 pr_err("Allocating AES fallback algorithm %s failed\n",
143 name);
144 return PTR_ERR(sctx->fallback.cip);
145 }
146
147 return 0;
148}
149
150static void fallback_exit_cip(struct crypto_tfm *tfm)
151{
152 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
153
154 crypto_free_cipher(sctx->fallback.cip);
155 sctx->fallback.cip = NULL;
156}
157
158static struct crypto_alg aes_alg = {
159 .cra_name = "aes",
160 .cra_driver_name = "aes-s390",
161 .cra_priority = 300,
162 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
163 CRYPTO_ALG_NEED_FALLBACK,
164 .cra_blocksize = AES_BLOCK_SIZE,
165 .cra_ctxsize = sizeof(struct s390_aes_ctx),
166 .cra_module = THIS_MODULE,
167 .cra_init = fallback_init_cip,
168 .cra_exit = fallback_exit_cip,
169 .cra_u = {
170 .cipher = {
171 .cia_min_keysize = AES_MIN_KEY_SIZE,
172 .cia_max_keysize = AES_MAX_KEY_SIZE,
173 .cia_setkey = aes_set_key,
174 .cia_encrypt = crypto_aes_encrypt,
175 .cia_decrypt = crypto_aes_decrypt,
176 }
177 }
178};
179
180static int setkey_fallback_skcipher(struct crypto_skcipher *tfm, const u8 *key,
181 unsigned int len)
182{
183 struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
184
185 crypto_skcipher_clear_flags(sctx->fallback.skcipher,
186 CRYPTO_TFM_REQ_MASK);
187 crypto_skcipher_set_flags(sctx->fallback.skcipher,
188 crypto_skcipher_get_flags(tfm) &
189 CRYPTO_TFM_REQ_MASK);
190 return crypto_skcipher_setkey(sctx->fallback.skcipher, key, len);
191}
192
193static int fallback_skcipher_crypt(struct s390_aes_ctx *sctx,
194 struct skcipher_request *req,
195 unsigned long modifier)
196{
197 struct skcipher_request *subreq = skcipher_request_ctx(req);
198
199 *subreq = *req;
200 skcipher_request_set_tfm(subreq, sctx->fallback.skcipher);
201 return (modifier & CPACF_DECRYPT) ?
202 crypto_skcipher_decrypt(subreq) :
203 crypto_skcipher_encrypt(subreq);
204}
205
206static int ecb_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
207 unsigned int key_len)
208{
209 struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
210 unsigned long fc;
211
212 /* Pick the correct function code based on the key length */
213 fc = (key_len == 16) ? CPACF_KM_AES_128 :
214 (key_len == 24) ? CPACF_KM_AES_192 :
215 (key_len == 32) ? CPACF_KM_AES_256 : 0;
216
217 /* Check if the function code is available */
218 sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
219 if (!sctx->fc)
220 return setkey_fallback_skcipher(tfm, in_key, key_len);
221
222 sctx->key_len = key_len;
223 memcpy(sctx->key, in_key, key_len);
224 return 0;
225}
226
227static int ecb_aes_crypt(struct skcipher_request *req, unsigned long modifier)
228{
229 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
230 struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
231 struct skcipher_walk walk;
232 unsigned int nbytes, n;
233 int ret;
234
235 if (unlikely(!sctx->fc))
236 return fallback_skcipher_crypt(sctx, req, modifier);
237
238 ret = skcipher_walk_virt(&walk, req, false);
239 while ((nbytes = walk.nbytes) != 0) {
240 /* only use complete blocks */
241 n = nbytes & ~(AES_BLOCK_SIZE - 1);
242 cpacf_km(sctx->fc | modifier, sctx->key,
243 walk.dst.virt.addr, walk.src.virt.addr, n);
244 ret = skcipher_walk_done(&walk, nbytes - n);
245 }
246 return ret;
247}
248
249static int ecb_aes_encrypt(struct skcipher_request *req)
250{
251 return ecb_aes_crypt(req, 0);
252}
253
254static int ecb_aes_decrypt(struct skcipher_request *req)
255{
256 return ecb_aes_crypt(req, CPACF_DECRYPT);
257}
258
259static int fallback_init_skcipher(struct crypto_skcipher *tfm)
260{
261 const char *name = crypto_tfm_alg_name(&tfm->base);
262 struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
263
264 sctx->fallback.skcipher = crypto_alloc_skcipher(name, 0,
265 CRYPTO_ALG_NEED_FALLBACK | CRYPTO_ALG_ASYNC);
266
267 if (IS_ERR(sctx->fallback.skcipher)) {
268 pr_err("Allocating AES fallback algorithm %s failed\n",
269 name);
270 return PTR_ERR(sctx->fallback.skcipher);
271 }
272
273 crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
274 crypto_skcipher_reqsize(sctx->fallback.skcipher));
275 return 0;
276}
277
278static void fallback_exit_skcipher(struct crypto_skcipher *tfm)
279{
280 struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
281
282 crypto_free_skcipher(sctx->fallback.skcipher);
283}
284
285static struct skcipher_alg ecb_aes_alg = {
286 .base.cra_name = "ecb(aes)",
287 .base.cra_driver_name = "ecb-aes-s390",
288 .base.cra_priority = 401, /* combo: aes + ecb + 1 */
289 .base.cra_flags = CRYPTO_ALG_NEED_FALLBACK,
290 .base.cra_blocksize = AES_BLOCK_SIZE,
291 .base.cra_ctxsize = sizeof(struct s390_aes_ctx),
292 .base.cra_module = THIS_MODULE,
293 .init = fallback_init_skcipher,
294 .exit = fallback_exit_skcipher,
295 .min_keysize = AES_MIN_KEY_SIZE,
296 .max_keysize = AES_MAX_KEY_SIZE,
297 .setkey = ecb_aes_set_key,
298 .encrypt = ecb_aes_encrypt,
299 .decrypt = ecb_aes_decrypt,
300};
301
302static int cbc_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
303 unsigned int key_len)
304{
305 struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
306 unsigned long fc;
307
308 /* Pick the correct function code based on the key length */
309 fc = (key_len == 16) ? CPACF_KMC_AES_128 :
310 (key_len == 24) ? CPACF_KMC_AES_192 :
311 (key_len == 32) ? CPACF_KMC_AES_256 : 0;
312
313 /* Check if the function code is available */
314 sctx->fc = (fc && cpacf_test_func(&kmc_functions, fc)) ? fc : 0;
315 if (!sctx->fc)
316 return setkey_fallback_skcipher(tfm, in_key, key_len);
317
318 sctx->key_len = key_len;
319 memcpy(sctx->key, in_key, key_len);
320 return 0;
321}
322
323static int cbc_aes_crypt(struct skcipher_request *req, unsigned long modifier)
324{
325 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
326 struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
327 struct skcipher_walk walk;
328 unsigned int nbytes, n;
329 int ret;
330 struct {
331 u8 iv[AES_BLOCK_SIZE];
332 u8 key[AES_MAX_KEY_SIZE];
333 } param;
334
335 if (unlikely(!sctx->fc))
336 return fallback_skcipher_crypt(sctx, req, modifier);
337
338 ret = skcipher_walk_virt(&walk, req, false);
339 if (ret)
340 return ret;
341 memcpy(param.iv, walk.iv, AES_BLOCK_SIZE);
342 memcpy(param.key, sctx->key, sctx->key_len);
343 while ((nbytes = walk.nbytes) != 0) {
344 /* only use complete blocks */
345 n = nbytes & ~(AES_BLOCK_SIZE - 1);
346 cpacf_kmc(sctx->fc | modifier, ¶m,
347 walk.dst.virt.addr, walk.src.virt.addr, n);
348 memcpy(walk.iv, param.iv, AES_BLOCK_SIZE);
349 ret = skcipher_walk_done(&walk, nbytes - n);
350 }
351 memzero_explicit(¶m, sizeof(param));
352 return ret;
353}
354
355static int cbc_aes_encrypt(struct skcipher_request *req)
356{
357 return cbc_aes_crypt(req, 0);
358}
359
360static int cbc_aes_decrypt(struct skcipher_request *req)
361{
362 return cbc_aes_crypt(req, CPACF_DECRYPT);
363}
364
365static struct skcipher_alg cbc_aes_alg = {
366 .base.cra_name = "cbc(aes)",
367 .base.cra_driver_name = "cbc-aes-s390",
368 .base.cra_priority = 402, /* ecb-aes-s390 + 1 */
369 .base.cra_flags = CRYPTO_ALG_NEED_FALLBACK,
370 .base.cra_blocksize = AES_BLOCK_SIZE,
371 .base.cra_ctxsize = sizeof(struct s390_aes_ctx),
372 .base.cra_module = THIS_MODULE,
373 .init = fallback_init_skcipher,
374 .exit = fallback_exit_skcipher,
375 .min_keysize = AES_MIN_KEY_SIZE,
376 .max_keysize = AES_MAX_KEY_SIZE,
377 .ivsize = AES_BLOCK_SIZE,
378 .setkey = cbc_aes_set_key,
379 .encrypt = cbc_aes_encrypt,
380 .decrypt = cbc_aes_decrypt,
381};
382
383static int xts_fallback_setkey(struct crypto_skcipher *tfm, const u8 *key,
384 unsigned int len)
385{
386 struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
387
388 crypto_skcipher_clear_flags(xts_ctx->fallback, CRYPTO_TFM_REQ_MASK);
389 crypto_skcipher_set_flags(xts_ctx->fallback,
390 crypto_skcipher_get_flags(tfm) &
391 CRYPTO_TFM_REQ_MASK);
392 return crypto_skcipher_setkey(xts_ctx->fallback, key, len);
393}
394
395static int xts_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
396 unsigned int key_len)
397{
398 struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
399 unsigned long fc;
400 int err;
401
402 err = xts_fallback_setkey(tfm, in_key, key_len);
403 if (err)
404 return err;
405
406 /* Pick the correct function code based on the key length */
407 fc = (key_len == 32) ? CPACF_KM_XTS_128 :
408 (key_len == 64) ? CPACF_KM_XTS_256 : 0;
409
410 /* Check if the function code is available */
411 xts_ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
412 if (!xts_ctx->fc)
413 return 0;
414
415 /* Split the XTS key into the two subkeys */
416 key_len = key_len / 2;
417 xts_ctx->key_len = key_len;
418 memcpy(xts_ctx->key, in_key, key_len);
419 memcpy(xts_ctx->pcc_key, in_key + key_len, key_len);
420 return 0;
421}
422
423static int xts_aes_crypt(struct skcipher_request *req, unsigned long modifier)
424{
425 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
426 struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
427 struct skcipher_walk walk;
428 unsigned int offset, nbytes, n;
429 int ret;
430 struct {
431 u8 key[32];
432 u8 tweak[16];
433 u8 block[16];
434 u8 bit[16];
435 u8 xts[16];
436 } pcc_param;
437 struct {
438 u8 key[32];
439 u8 init[16];
440 } xts_param;
441
442 if (req->cryptlen < AES_BLOCK_SIZE)
443 return -EINVAL;
444
445 if (unlikely(!xts_ctx->fc || (req->cryptlen % AES_BLOCK_SIZE) != 0)) {
446 struct skcipher_request *subreq = skcipher_request_ctx(req);
447
448 *subreq = *req;
449 skcipher_request_set_tfm(subreq, xts_ctx->fallback);
450 return (modifier & CPACF_DECRYPT) ?
451 crypto_skcipher_decrypt(subreq) :
452 crypto_skcipher_encrypt(subreq);
453 }
454
455 ret = skcipher_walk_virt(&walk, req, false);
456 if (ret)
457 return ret;
458 offset = xts_ctx->key_len & 0x10;
459 memset(pcc_param.block, 0, sizeof(pcc_param.block));
460 memset(pcc_param.bit, 0, sizeof(pcc_param.bit));
461 memset(pcc_param.xts, 0, sizeof(pcc_param.xts));
462 memcpy(pcc_param.tweak, walk.iv, sizeof(pcc_param.tweak));
463 memcpy(pcc_param.key + offset, xts_ctx->pcc_key, xts_ctx->key_len);
464 cpacf_pcc(xts_ctx->fc, pcc_param.key + offset);
465
466 memcpy(xts_param.key + offset, xts_ctx->key, xts_ctx->key_len);
467 memcpy(xts_param.init, pcc_param.xts, 16);
468
469 while ((nbytes = walk.nbytes) != 0) {
470 /* only use complete blocks */
471 n = nbytes & ~(AES_BLOCK_SIZE - 1);
472 cpacf_km(xts_ctx->fc | modifier, xts_param.key + offset,
473 walk.dst.virt.addr, walk.src.virt.addr, n);
474 ret = skcipher_walk_done(&walk, nbytes - n);
475 }
476 memzero_explicit(&pcc_param, sizeof(pcc_param));
477 memzero_explicit(&xts_param, sizeof(xts_param));
478 return ret;
479}
480
481static int xts_aes_encrypt(struct skcipher_request *req)
482{
483 return xts_aes_crypt(req, 0);
484}
485
486static int xts_aes_decrypt(struct skcipher_request *req)
487{
488 return xts_aes_crypt(req, CPACF_DECRYPT);
489}
490
491static int xts_fallback_init(struct crypto_skcipher *tfm)
492{
493 const char *name = crypto_tfm_alg_name(&tfm->base);
494 struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
495
496 xts_ctx->fallback = crypto_alloc_skcipher(name, 0,
497 CRYPTO_ALG_NEED_FALLBACK | CRYPTO_ALG_ASYNC);
498
499 if (IS_ERR(xts_ctx->fallback)) {
500 pr_err("Allocating XTS fallback algorithm %s failed\n",
501 name);
502 return PTR_ERR(xts_ctx->fallback);
503 }
504 crypto_skcipher_set_reqsize(tfm, sizeof(struct skcipher_request) +
505 crypto_skcipher_reqsize(xts_ctx->fallback));
506 return 0;
507}
508
509static void xts_fallback_exit(struct crypto_skcipher *tfm)
510{
511 struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
512
513 crypto_free_skcipher(xts_ctx->fallback);
514}
515
516static struct skcipher_alg xts_aes_alg = {
517 .base.cra_name = "xts(aes)",
518 .base.cra_driver_name = "xts-aes-s390",
519 .base.cra_priority = 402, /* ecb-aes-s390 + 1 */
520 .base.cra_flags = CRYPTO_ALG_NEED_FALLBACK,
521 .base.cra_blocksize = AES_BLOCK_SIZE,
522 .base.cra_ctxsize = sizeof(struct s390_xts_ctx),
523 .base.cra_module = THIS_MODULE,
524 .init = xts_fallback_init,
525 .exit = xts_fallback_exit,
526 .min_keysize = 2 * AES_MIN_KEY_SIZE,
527 .max_keysize = 2 * AES_MAX_KEY_SIZE,
528 .ivsize = AES_BLOCK_SIZE,
529 .setkey = xts_aes_set_key,
530 .encrypt = xts_aes_encrypt,
531 .decrypt = xts_aes_decrypt,
532};
533
534static int fullxts_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
535 unsigned int key_len)
536{
537 struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
538 unsigned long fc;
539 int err;
540
541 err = xts_fallback_setkey(tfm, in_key, key_len);
542 if (err)
543 return err;
544
545 /* Pick the correct function code based on the key length */
546 fc = (key_len == 32) ? CPACF_KM_XTS_128_FULL :
547 (key_len == 64) ? CPACF_KM_XTS_256_FULL : 0;
548
549 /* Check if the function code is available */
550 xts_ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
551 if (!xts_ctx->fc)
552 return 0;
553
554 /* Store double-key */
555 memcpy(xts_ctx->keys, in_key, key_len);
556 xts_ctx->key_len = key_len;
557 return 0;
558}
559
560static int fullxts_aes_crypt(struct skcipher_request *req, unsigned long modifier)
561{
562 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
563 struct s390_xts_ctx *xts_ctx = crypto_skcipher_ctx(tfm);
564 unsigned int offset, nbytes, n;
565 struct skcipher_walk walk;
566 int ret;
567 struct {
568 __u8 key[64];
569 __u8 tweak[16];
570 __u8 nap[16];
571 } fxts_param = {
572 .nap = {0},
573 };
574
575 if (req->cryptlen < AES_BLOCK_SIZE)
576 return -EINVAL;
577
578 if (unlikely(!xts_ctx->fc || (req->cryptlen % AES_BLOCK_SIZE) != 0)) {
579 struct skcipher_request *subreq = skcipher_request_ctx(req);
580
581 *subreq = *req;
582 skcipher_request_set_tfm(subreq, xts_ctx->fallback);
583 return (modifier & CPACF_DECRYPT) ?
584 crypto_skcipher_decrypt(subreq) :
585 crypto_skcipher_encrypt(subreq);
586 }
587
588 ret = skcipher_walk_virt(&walk, req, false);
589 if (ret)
590 return ret;
591
592 offset = xts_ctx->key_len & 0x20;
593 memcpy(fxts_param.key + offset, xts_ctx->keys, xts_ctx->key_len);
594 memcpy(fxts_param.tweak, req->iv, AES_BLOCK_SIZE);
595 fxts_param.nap[0] = 0x01; /* initial alpha power (1, little-endian) */
596
597 while ((nbytes = walk.nbytes) != 0) {
598 /* only use complete blocks */
599 n = nbytes & ~(AES_BLOCK_SIZE - 1);
600 cpacf_km(xts_ctx->fc | modifier, fxts_param.key + offset,
601 walk.dst.virt.addr, walk.src.virt.addr, n);
602 ret = skcipher_walk_done(&walk, nbytes - n);
603 }
604 memzero_explicit(&fxts_param, sizeof(fxts_param));
605 return ret;
606}
607
608static int fullxts_aes_encrypt(struct skcipher_request *req)
609{
610 return fullxts_aes_crypt(req, 0);
611}
612
613static int fullxts_aes_decrypt(struct skcipher_request *req)
614{
615 return fullxts_aes_crypt(req, CPACF_DECRYPT);
616}
617
618static struct skcipher_alg fullxts_aes_alg = {
619 .base.cra_name = "xts(aes)",
620 .base.cra_driver_name = "full-xts-aes-s390",
621 .base.cra_priority = 403, /* aes-xts-s390 + 1 */
622 .base.cra_flags = CRYPTO_ALG_NEED_FALLBACK,
623 .base.cra_blocksize = AES_BLOCK_SIZE,
624 .base.cra_ctxsize = sizeof(struct s390_xts_ctx),
625 .base.cra_module = THIS_MODULE,
626 .init = xts_fallback_init,
627 .exit = xts_fallback_exit,
628 .min_keysize = 2 * AES_MIN_KEY_SIZE,
629 .max_keysize = 2 * AES_MAX_KEY_SIZE,
630 .ivsize = AES_BLOCK_SIZE,
631 .setkey = fullxts_aes_set_key,
632 .encrypt = fullxts_aes_encrypt,
633 .decrypt = fullxts_aes_decrypt,
634};
635
636static int ctr_aes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
637 unsigned int key_len)
638{
639 struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
640 unsigned long fc;
641
642 /* Pick the correct function code based on the key length */
643 fc = (key_len == 16) ? CPACF_KMCTR_AES_128 :
644 (key_len == 24) ? CPACF_KMCTR_AES_192 :
645 (key_len == 32) ? CPACF_KMCTR_AES_256 : 0;
646
647 /* Check if the function code is available */
648 sctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0;
649 if (!sctx->fc)
650 return setkey_fallback_skcipher(tfm, in_key, key_len);
651
652 sctx->key_len = key_len;
653 memcpy(sctx->key, in_key, key_len);
654 return 0;
655}
656
657static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
658{
659 unsigned int i, n;
660
661 /* only use complete blocks, max. PAGE_SIZE */
662 memcpy(ctrptr, iv, AES_BLOCK_SIZE);
663 n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);
664 for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) {
665 memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE);
666 crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE);
667 ctrptr += AES_BLOCK_SIZE;
668 }
669 return n;
670}
671
672static int ctr_aes_crypt(struct skcipher_request *req)
673{
674 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
675 struct s390_aes_ctx *sctx = crypto_skcipher_ctx(tfm);
676 u8 buf[AES_BLOCK_SIZE], *ctrptr;
677 struct skcipher_walk walk;
678 unsigned int n, nbytes;
679 int ret, locked;
680
681 if (unlikely(!sctx->fc))
682 return fallback_skcipher_crypt(sctx, req, 0);
683
684 locked = mutex_trylock(&ctrblk_lock);
685
686 ret = skcipher_walk_virt(&walk, req, false);
687 while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
688 n = AES_BLOCK_SIZE;
689
690 if (nbytes >= 2*AES_BLOCK_SIZE && locked)
691 n = __ctrblk_init(ctrblk, walk.iv, nbytes);
692 ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk.iv;
693 cpacf_kmctr(sctx->fc, sctx->key, walk.dst.virt.addr,
694 walk.src.virt.addr, n, ctrptr);
695 if (ctrptr == ctrblk)
696 memcpy(walk.iv, ctrptr + n - AES_BLOCK_SIZE,
697 AES_BLOCK_SIZE);
698 crypto_inc(walk.iv, AES_BLOCK_SIZE);
699 ret = skcipher_walk_done(&walk, nbytes - n);
700 }
701 if (locked)
702 mutex_unlock(&ctrblk_lock);
703 /*
704 * final block may be < AES_BLOCK_SIZE, copy only nbytes
705 */
706 if (nbytes) {
707 memset(buf, 0, AES_BLOCK_SIZE);
708 memcpy(buf, walk.src.virt.addr, nbytes);
709 cpacf_kmctr(sctx->fc, sctx->key, buf, buf,
710 AES_BLOCK_SIZE, walk.iv);
711 memcpy(walk.dst.virt.addr, buf, nbytes);
712 crypto_inc(walk.iv, AES_BLOCK_SIZE);
713 ret = skcipher_walk_done(&walk, 0);
714 }
715
716 return ret;
717}
718
719static struct skcipher_alg ctr_aes_alg = {
720 .base.cra_name = "ctr(aes)",
721 .base.cra_driver_name = "ctr-aes-s390",
722 .base.cra_priority = 402, /* ecb-aes-s390 + 1 */
723 .base.cra_flags = CRYPTO_ALG_NEED_FALLBACK,
724 .base.cra_blocksize = 1,
725 .base.cra_ctxsize = sizeof(struct s390_aes_ctx),
726 .base.cra_module = THIS_MODULE,
727 .init = fallback_init_skcipher,
728 .exit = fallback_exit_skcipher,
729 .min_keysize = AES_MIN_KEY_SIZE,
730 .max_keysize = AES_MAX_KEY_SIZE,
731 .ivsize = AES_BLOCK_SIZE,
732 .setkey = ctr_aes_set_key,
733 .encrypt = ctr_aes_crypt,
734 .decrypt = ctr_aes_crypt,
735 .chunksize = AES_BLOCK_SIZE,
736};
737
738static int gcm_aes_setkey(struct crypto_aead *tfm, const u8 *key,
739 unsigned int keylen)
740{
741 struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
742
743 switch (keylen) {
744 case AES_KEYSIZE_128:
745 ctx->fc = CPACF_KMA_GCM_AES_128;
746 break;
747 case AES_KEYSIZE_192:
748 ctx->fc = CPACF_KMA_GCM_AES_192;
749 break;
750 case AES_KEYSIZE_256:
751 ctx->fc = CPACF_KMA_GCM_AES_256;
752 break;
753 default:
754 return -EINVAL;
755 }
756
757 memcpy(ctx->key, key, keylen);
758 ctx->key_len = keylen;
759 return 0;
760}
761
762static int gcm_aes_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
763{
764 switch (authsize) {
765 case 4:
766 case 8:
767 case 12:
768 case 13:
769 case 14:
770 case 15:
771 case 16:
772 break;
773 default:
774 return -EINVAL;
775 }
776
777 return 0;
778}
779
780static void gcm_walk_start(struct gcm_sg_walk *gw, struct scatterlist *sg,
781 unsigned int len)
782{
783 memset(gw, 0, sizeof(*gw));
784 gw->walk_bytes_remain = len;
785 scatterwalk_start(&gw->walk, sg);
786}
787
788static inline unsigned int _gcm_sg_clamp_and_map(struct gcm_sg_walk *gw)
789{
790 struct scatterlist *nextsg;
791
792 gw->walk_bytes = scatterwalk_clamp(&gw->walk, gw->walk_bytes_remain);
793 while (!gw->walk_bytes) {
794 nextsg = sg_next(gw->walk.sg);
795 if (!nextsg)
796 return 0;
797 scatterwalk_start(&gw->walk, nextsg);
798 gw->walk_bytes = scatterwalk_clamp(&gw->walk,
799 gw->walk_bytes_remain);
800 }
801 gw->walk_ptr = scatterwalk_map(&gw->walk);
802 return gw->walk_bytes;
803}
804
805static inline void _gcm_sg_unmap_and_advance(struct gcm_sg_walk *gw,
806 unsigned int nbytes)
807{
808 gw->walk_bytes_remain -= nbytes;
809 scatterwalk_unmap(gw->walk_ptr);
810 scatterwalk_advance(&gw->walk, nbytes);
811 scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
812 gw->walk_ptr = NULL;
813}
814
815static int gcm_in_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
816{
817 int n;
818
819 if (gw->buf_bytes && gw->buf_bytes >= minbytesneeded) {
820 gw->ptr = gw->buf;
821 gw->nbytes = gw->buf_bytes;
822 goto out;
823 }
824
825 if (gw->walk_bytes_remain == 0) {
826 gw->ptr = NULL;
827 gw->nbytes = 0;
828 goto out;
829 }
830
831 if (!_gcm_sg_clamp_and_map(gw)) {
832 gw->ptr = NULL;
833 gw->nbytes = 0;
834 goto out;
835 }
836
837 if (!gw->buf_bytes && gw->walk_bytes >= minbytesneeded) {
838 gw->ptr = gw->walk_ptr;
839 gw->nbytes = gw->walk_bytes;
840 goto out;
841 }
842
843 while (1) {
844 n = min(gw->walk_bytes, AES_BLOCK_SIZE - gw->buf_bytes);
845 memcpy(gw->buf + gw->buf_bytes, gw->walk_ptr, n);
846 gw->buf_bytes += n;
847 _gcm_sg_unmap_and_advance(gw, n);
848 if (gw->buf_bytes >= minbytesneeded) {
849 gw->ptr = gw->buf;
850 gw->nbytes = gw->buf_bytes;
851 goto out;
852 }
853 if (!_gcm_sg_clamp_and_map(gw)) {
854 gw->ptr = NULL;
855 gw->nbytes = 0;
856 goto out;
857 }
858 }
859
860out:
861 return gw->nbytes;
862}
863
864static int gcm_out_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
865{
866 if (gw->walk_bytes_remain == 0) {
867 gw->ptr = NULL;
868 gw->nbytes = 0;
869 goto out;
870 }
871
872 if (!_gcm_sg_clamp_and_map(gw)) {
873 gw->ptr = NULL;
874 gw->nbytes = 0;
875 goto out;
876 }
877
878 if (gw->walk_bytes >= minbytesneeded) {
879 gw->ptr = gw->walk_ptr;
880 gw->nbytes = gw->walk_bytes;
881 goto out;
882 }
883
884 scatterwalk_unmap(gw->walk_ptr);
885 gw->walk_ptr = NULL;
886
887 gw->ptr = gw->buf;
888 gw->nbytes = sizeof(gw->buf);
889
890out:
891 return gw->nbytes;
892}
893
894static int gcm_in_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
895{
896 if (gw->ptr == NULL)
897 return 0;
898
899 if (gw->ptr == gw->buf) {
900 int n = gw->buf_bytes - bytesdone;
901 if (n > 0) {
902 memmove(gw->buf, gw->buf + bytesdone, n);
903 gw->buf_bytes = n;
904 } else
905 gw->buf_bytes = 0;
906 } else
907 _gcm_sg_unmap_and_advance(gw, bytesdone);
908
909 return bytesdone;
910}
911
912static int gcm_out_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
913{
914 int i, n;
915
916 if (gw->ptr == NULL)
917 return 0;
918
919 if (gw->ptr == gw->buf) {
920 for (i = 0; i < bytesdone; i += n) {
921 if (!_gcm_sg_clamp_and_map(gw))
922 return i;
923 n = min(gw->walk_bytes, bytesdone - i);
924 memcpy(gw->walk_ptr, gw->buf + i, n);
925 _gcm_sg_unmap_and_advance(gw, n);
926 }
927 } else
928 _gcm_sg_unmap_and_advance(gw, bytesdone);
929
930 return bytesdone;
931}
932
933static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
934{
935 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
936 struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
937 unsigned int ivsize = crypto_aead_ivsize(tfm);
938 unsigned int taglen = crypto_aead_authsize(tfm);
939 unsigned int aadlen = req->assoclen;
940 unsigned int pclen = req->cryptlen;
941 int ret = 0;
942
943 unsigned int n, len, in_bytes, out_bytes,
944 min_bytes, bytes, aad_bytes, pc_bytes;
945 struct gcm_sg_walk gw_in, gw_out;
946 u8 tag[GHASH_DIGEST_SIZE];
947
948 struct {
949 u32 _[3]; /* reserved */
950 u32 cv; /* Counter Value */
951 u8 t[GHASH_DIGEST_SIZE];/* Tag */
952 u8 h[AES_BLOCK_SIZE]; /* Hash-subkey */
953 u64 taadl; /* Total AAD Length */
954 u64 tpcl; /* Total Plain-/Cipher-text Length */
955 u8 j0[GHASH_BLOCK_SIZE];/* initial counter value */
956 u8 k[AES_MAX_KEY_SIZE]; /* Key */
957 } param;
958
959 /*
960 * encrypt
961 * req->src: aad||plaintext
962 * req->dst: aad||ciphertext||tag
963 * decrypt
964 * req->src: aad||ciphertext||tag
965 * req->dst: aad||plaintext, return 0 or -EBADMSG
966 * aad, plaintext and ciphertext may be empty.
967 */
968 if (flags & CPACF_DECRYPT)
969 pclen -= taglen;
970 len = aadlen + pclen;
971
972 memset(¶m, 0, sizeof(param));
973 param.cv = 1;
974 param.taadl = aadlen * 8;
975 param.tpcl = pclen * 8;
976 memcpy(param.j0, req->iv, ivsize);
977 *(u32 *)(param.j0 + ivsize) = 1;
978 memcpy(param.k, ctx->key, ctx->key_len);
979
980 gcm_walk_start(&gw_in, req->src, len);
981 gcm_walk_start(&gw_out, req->dst, len);
982
983 do {
984 min_bytes = min_t(unsigned int,
985 aadlen > 0 ? aadlen : pclen, AES_BLOCK_SIZE);
986 in_bytes = gcm_in_walk_go(&gw_in, min_bytes);
987 out_bytes = gcm_out_walk_go(&gw_out, min_bytes);
988 bytes = min(in_bytes, out_bytes);
989
990 if (aadlen + pclen <= bytes) {
991 aad_bytes = aadlen;
992 pc_bytes = pclen;
993 flags |= CPACF_KMA_LAAD | CPACF_KMA_LPC;
994 } else {
995 if (aadlen <= bytes) {
996 aad_bytes = aadlen;
997 pc_bytes = (bytes - aadlen) &
998 ~(AES_BLOCK_SIZE - 1);
999 flags |= CPACF_KMA_LAAD;
1000 } else {
1001 aad_bytes = bytes & ~(AES_BLOCK_SIZE - 1);
1002 pc_bytes = 0;
1003 }
1004 }
1005
1006 if (aad_bytes > 0)
1007 memcpy(gw_out.ptr, gw_in.ptr, aad_bytes);
1008
1009 cpacf_kma(ctx->fc | flags, ¶m,
1010 gw_out.ptr + aad_bytes,
1011 gw_in.ptr + aad_bytes, pc_bytes,
1012 gw_in.ptr, aad_bytes);
1013
1014 n = aad_bytes + pc_bytes;
1015 if (gcm_in_walk_done(&gw_in, n) != n)
1016 return -ENOMEM;
1017 if (gcm_out_walk_done(&gw_out, n) != n)
1018 return -ENOMEM;
1019 aadlen -= aad_bytes;
1020 pclen -= pc_bytes;
1021 } while (aadlen + pclen > 0);
1022
1023 if (flags & CPACF_DECRYPT) {
1024 scatterwalk_map_and_copy(tag, req->src, len, taglen, 0);
1025 if (crypto_memneq(tag, param.t, taglen))
1026 ret = -EBADMSG;
1027 } else
1028 scatterwalk_map_and_copy(param.t, req->dst, len, taglen, 1);
1029
1030 memzero_explicit(¶m, sizeof(param));
1031 return ret;
1032}
1033
1034static int gcm_aes_encrypt(struct aead_request *req)
1035{
1036 return gcm_aes_crypt(req, CPACF_ENCRYPT);
1037}
1038
1039static int gcm_aes_decrypt(struct aead_request *req)
1040{
1041 return gcm_aes_crypt(req, CPACF_DECRYPT);
1042}
1043
1044static struct aead_alg gcm_aes_aead = {
1045 .setkey = gcm_aes_setkey,
1046 .setauthsize = gcm_aes_setauthsize,
1047 .encrypt = gcm_aes_encrypt,
1048 .decrypt = gcm_aes_decrypt,
1049
1050 .ivsize = GHASH_BLOCK_SIZE - sizeof(u32),
1051 .maxauthsize = GHASH_DIGEST_SIZE,
1052 .chunksize = AES_BLOCK_SIZE,
1053
1054 .base = {
1055 .cra_blocksize = 1,
1056 .cra_ctxsize = sizeof(struct s390_aes_ctx),
1057 .cra_priority = 900,
1058 .cra_name = "gcm(aes)",
1059 .cra_driver_name = "gcm-aes-s390",
1060 .cra_module = THIS_MODULE,
1061 },
1062};
1063
1064static struct crypto_alg *aes_s390_alg;
1065static struct skcipher_alg *aes_s390_skcipher_algs[5];
1066static int aes_s390_skciphers_num;
1067static struct aead_alg *aes_s390_aead_alg;
1068
1069static int aes_s390_register_skcipher(struct skcipher_alg *alg)
1070{
1071 int ret;
1072
1073 ret = crypto_register_skcipher(alg);
1074 if (!ret)
1075 aes_s390_skcipher_algs[aes_s390_skciphers_num++] = alg;
1076 return ret;
1077}
1078
1079static void aes_s390_fini(void)
1080{
1081 if (aes_s390_alg)
1082 crypto_unregister_alg(aes_s390_alg);
1083 while (aes_s390_skciphers_num--)
1084 crypto_unregister_skcipher(aes_s390_skcipher_algs[aes_s390_skciphers_num]);
1085 if (ctrblk)
1086 free_page((unsigned long) ctrblk);
1087
1088 if (aes_s390_aead_alg)
1089 crypto_unregister_aead(aes_s390_aead_alg);
1090}
1091
1092static int __init aes_s390_init(void)
1093{
1094 int ret;
1095
1096 /* Query available functions for KM, KMC, KMCTR and KMA */
1097 cpacf_query(CPACF_KM, &km_functions);
1098 cpacf_query(CPACF_KMC, &kmc_functions);
1099 cpacf_query(CPACF_KMCTR, &kmctr_functions);
1100 cpacf_query(CPACF_KMA, &kma_functions);
1101
1102 if (cpacf_test_func(&km_functions, CPACF_KM_AES_128) ||
1103 cpacf_test_func(&km_functions, CPACF_KM_AES_192) ||
1104 cpacf_test_func(&km_functions, CPACF_KM_AES_256)) {
1105 ret = crypto_register_alg(&aes_alg);
1106 if (ret)
1107 goto out_err;
1108 aes_s390_alg = &aes_alg;
1109 ret = aes_s390_register_skcipher(&ecb_aes_alg);
1110 if (ret)
1111 goto out_err;
1112 }
1113
1114 if (cpacf_test_func(&kmc_functions, CPACF_KMC_AES_128) ||
1115 cpacf_test_func(&kmc_functions, CPACF_KMC_AES_192) ||
1116 cpacf_test_func(&kmc_functions, CPACF_KMC_AES_256)) {
1117 ret = aes_s390_register_skcipher(&cbc_aes_alg);
1118 if (ret)
1119 goto out_err;
1120 }
1121
1122 if (cpacf_test_func(&km_functions, CPACF_KM_XTS_128_FULL) ||
1123 cpacf_test_func(&km_functions, CPACF_KM_XTS_256_FULL)) {
1124 ret = aes_s390_register_skcipher(&fullxts_aes_alg);
1125 if (ret)
1126 goto out_err;
1127 }
1128
1129 if (cpacf_test_func(&km_functions, CPACF_KM_XTS_128) ||
1130 cpacf_test_func(&km_functions, CPACF_KM_XTS_256)) {
1131 ret = aes_s390_register_skcipher(&xts_aes_alg);
1132 if (ret)
1133 goto out_err;
1134 }
1135
1136 if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_128) ||
1137 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_192) ||
1138 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_256)) {
1139 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
1140 if (!ctrblk) {
1141 ret = -ENOMEM;
1142 goto out_err;
1143 }
1144 ret = aes_s390_register_skcipher(&ctr_aes_alg);
1145 if (ret)
1146 goto out_err;
1147 }
1148
1149 if (cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_128) ||
1150 cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_192) ||
1151 cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_256)) {
1152 ret = crypto_register_aead(&gcm_aes_aead);
1153 if (ret)
1154 goto out_err;
1155 aes_s390_aead_alg = &gcm_aes_aead;
1156 }
1157
1158 return 0;
1159out_err:
1160 aes_s390_fini();
1161 return ret;
1162}
1163
1164module_cpu_feature_match(S390_CPU_FEATURE_MSA, aes_s390_init);
1165module_exit(aes_s390_fini);
1166
1167MODULE_ALIAS_CRYPTO("aes-all");
1168
1169MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
1170MODULE_LICENSE("GPL");
1171MODULE_IMPORT_NS("CRYPTO_INTERNAL");
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
34static u8 *ctrblk;
35static DEFINE_SPINLOCK(ctrblk_lock);
36
37static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
38
39struct 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
49struct 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
57static 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
76static 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
97static 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
108static 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
120static 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
137static 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
145static 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
167static 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
186static 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
205static 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
222static 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
243static 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
262static 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
276static 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
290static 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
308static 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
315static 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
338static 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
359static 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, ¶m,
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
384static 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
398static 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
412static 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
436static 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
455static 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
474static 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
493static 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
521static 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
561static 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
575static 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
589static 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
606static 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
613static 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
637static 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
658static 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
673static 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
715static 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
729static 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
743static 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
767static struct crypto_alg *aes_s390_algs_ptr[5];
768static int aes_s390_algs_num;
769
770static 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
780static 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
788static 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;
837out_err:
838 aes_s390_fini();
839 return ret;
840}
841
842module_cpu_feature_match(MSA, aes_s390_init);
843module_exit(aes_s390_fini);
844
845MODULE_ALIAS_CRYPTO("aes-all");
846
847MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
848MODULE_LICENSE("GPL");