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