Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Cryptographic API.
4 *
5 * s390 implementation of the AES Cipher Algorithm with protected keys.
6 *
7 * s390 Version:
8 * Copyright IBM Corp. 2017, 2023
9 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
10 * Harald Freudenberger <freude@de.ibm.com>
11 */
12
13#define KMSG_COMPONENT "paes_s390"
14#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15
16#include <crypto/aes.h>
17#include <crypto/algapi.h>
18#include <linux/bug.h>
19#include <linux/err.h>
20#include <linux/module.h>
21#include <linux/cpufeature.h>
22#include <linux/init.h>
23#include <linux/mutex.h>
24#include <linux/spinlock.h>
25#include <linux/delay.h>
26#include <crypto/internal/skcipher.h>
27#include <crypto/xts.h>
28#include <asm/cpacf.h>
29#include <asm/pkey.h>
30
31/*
32 * Key blobs smaller/bigger than these defines are rejected
33 * by the common code even before the individual setkey function
34 * is called. As paes can handle different kinds of key blobs
35 * and padding is also possible, the limits need to be generous.
36 */
37#define PAES_MIN_KEYSIZE 16
38#define PAES_MAX_KEYSIZE MAXEP11AESKEYBLOBSIZE
39
40static u8 *ctrblk;
41static DEFINE_MUTEX(ctrblk_lock);
42
43static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
44
45struct key_blob {
46 /*
47 * Small keys will be stored in the keybuf. Larger keys are
48 * stored in extra allocated memory. In both cases does
49 * key point to the memory where the key is stored.
50 * The code distinguishes by checking keylen against
51 * sizeof(keybuf). See the two following helper functions.
52 */
53 u8 *key;
54 u8 keybuf[128];
55 unsigned int keylen;
56};
57
58static inline int _key_to_kb(struct key_blob *kb,
59 const u8 *key,
60 unsigned int keylen)
61{
62 struct clearkey_header {
63 u8 type;
64 u8 res0[3];
65 u8 version;
66 u8 res1[3];
67 u32 keytype;
68 u32 len;
69 } __packed * h;
70
71 switch (keylen) {
72 case 16:
73 case 24:
74 case 32:
75 /* clear key value, prepare pkey clear key token in keybuf */
76 memset(kb->keybuf, 0, sizeof(kb->keybuf));
77 h = (struct clearkey_header *) kb->keybuf;
78 h->version = 0x02; /* TOKVER_CLEAR_KEY */
79 h->keytype = (keylen - 8) >> 3;
80 h->len = keylen;
81 memcpy(kb->keybuf + sizeof(*h), key, keylen);
82 kb->keylen = sizeof(*h) + keylen;
83 kb->key = kb->keybuf;
84 break;
85 default:
86 /* other key material, let pkey handle this */
87 if (keylen <= sizeof(kb->keybuf))
88 kb->key = kb->keybuf;
89 else {
90 kb->key = kmalloc(keylen, GFP_KERNEL);
91 if (!kb->key)
92 return -ENOMEM;
93 }
94 memcpy(kb->key, key, keylen);
95 kb->keylen = keylen;
96 break;
97 }
98
99 return 0;
100}
101
102static inline void _free_kb_keybuf(struct key_blob *kb)
103{
104 if (kb->key && kb->key != kb->keybuf
105 && kb->keylen > sizeof(kb->keybuf)) {
106 kfree_sensitive(kb->key);
107 kb->key = NULL;
108 }
109}
110
111struct s390_paes_ctx {
112 struct key_blob kb;
113 struct pkey_protkey pk;
114 spinlock_t pk_lock;
115 unsigned long fc;
116};
117
118struct s390_pxts_ctx {
119 struct key_blob kb[2];
120 struct pkey_protkey pk[2];
121 spinlock_t pk_lock;
122 unsigned long fc;
123};
124
125static inline int __paes_keyblob2pkey(struct key_blob *kb,
126 struct pkey_protkey *pk)
127{
128 int i, ret;
129
130 /* try three times in case of failure */
131 for (i = 0; i < 3; i++) {
132 if (i > 0 && ret == -EAGAIN && in_task())
133 if (msleep_interruptible(1000))
134 return -EINTR;
135 ret = pkey_keyblob2pkey(kb->key, kb->keylen,
136 pk->protkey, &pk->len, &pk->type);
137 if (ret == 0)
138 break;
139 }
140
141 return ret;
142}
143
144static inline int __paes_convert_key(struct s390_paes_ctx *ctx)
145{
146 int ret;
147 struct pkey_protkey pkey;
148
149 pkey.len = sizeof(pkey.protkey);
150 ret = __paes_keyblob2pkey(&ctx->kb, &pkey);
151 if (ret)
152 return ret;
153
154 spin_lock_bh(&ctx->pk_lock);
155 memcpy(&ctx->pk, &pkey, sizeof(pkey));
156 spin_unlock_bh(&ctx->pk_lock);
157
158 return 0;
159}
160
161static int ecb_paes_init(struct crypto_skcipher *tfm)
162{
163 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
164
165 ctx->kb.key = NULL;
166 spin_lock_init(&ctx->pk_lock);
167
168 return 0;
169}
170
171static void ecb_paes_exit(struct crypto_skcipher *tfm)
172{
173 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
174
175 _free_kb_keybuf(&ctx->kb);
176}
177
178static inline int __ecb_paes_set_key(struct s390_paes_ctx *ctx)
179{
180 int rc;
181 unsigned long fc;
182
183 rc = __paes_convert_key(ctx);
184 if (rc)
185 return rc;
186
187 /* Pick the correct function code based on the protected key type */
188 fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PAES_128 :
189 (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KM_PAES_192 :
190 (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? CPACF_KM_PAES_256 : 0;
191
192 /* Check if the function code is available */
193 ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
194
195 return ctx->fc ? 0 : -EINVAL;
196}
197
198static int ecb_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
199 unsigned int key_len)
200{
201 int rc;
202 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
203
204 _free_kb_keybuf(&ctx->kb);
205 rc = _key_to_kb(&ctx->kb, in_key, key_len);
206 if (rc)
207 return rc;
208
209 return __ecb_paes_set_key(ctx);
210}
211
212static int ecb_paes_crypt(struct skcipher_request *req, unsigned long modifier)
213{
214 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
215 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
216 struct skcipher_walk walk;
217 unsigned int nbytes, n, k;
218 int ret;
219 struct {
220 u8 key[MAXPROTKEYSIZE];
221 } param;
222
223 ret = skcipher_walk_virt(&walk, req, false);
224 if (ret)
225 return ret;
226
227 spin_lock_bh(&ctx->pk_lock);
228 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
229 spin_unlock_bh(&ctx->pk_lock);
230
231 while ((nbytes = walk.nbytes) != 0) {
232 /* only use complete blocks */
233 n = nbytes & ~(AES_BLOCK_SIZE - 1);
234 k = cpacf_km(ctx->fc | modifier, ¶m,
235 walk.dst.virt.addr, walk.src.virt.addr, n);
236 if (k)
237 ret = skcipher_walk_done(&walk, nbytes - k);
238 if (k < n) {
239 if (__paes_convert_key(ctx))
240 return skcipher_walk_done(&walk, -EIO);
241 spin_lock_bh(&ctx->pk_lock);
242 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
243 spin_unlock_bh(&ctx->pk_lock);
244 }
245 }
246 return ret;
247}
248
249static int ecb_paes_encrypt(struct skcipher_request *req)
250{
251 return ecb_paes_crypt(req, 0);
252}
253
254static int ecb_paes_decrypt(struct skcipher_request *req)
255{
256 return ecb_paes_crypt(req, CPACF_DECRYPT);
257}
258
259static struct skcipher_alg ecb_paes_alg = {
260 .base.cra_name = "ecb(paes)",
261 .base.cra_driver_name = "ecb-paes-s390",
262 .base.cra_priority = 401, /* combo: aes + ecb + 1 */
263 .base.cra_blocksize = AES_BLOCK_SIZE,
264 .base.cra_ctxsize = sizeof(struct s390_paes_ctx),
265 .base.cra_module = THIS_MODULE,
266 .base.cra_list = LIST_HEAD_INIT(ecb_paes_alg.base.cra_list),
267 .init = ecb_paes_init,
268 .exit = ecb_paes_exit,
269 .min_keysize = PAES_MIN_KEYSIZE,
270 .max_keysize = PAES_MAX_KEYSIZE,
271 .setkey = ecb_paes_set_key,
272 .encrypt = ecb_paes_encrypt,
273 .decrypt = ecb_paes_decrypt,
274};
275
276static int cbc_paes_init(struct crypto_skcipher *tfm)
277{
278 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
279
280 ctx->kb.key = NULL;
281 spin_lock_init(&ctx->pk_lock);
282
283 return 0;
284}
285
286static void cbc_paes_exit(struct crypto_skcipher *tfm)
287{
288 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
289
290 _free_kb_keybuf(&ctx->kb);
291}
292
293static inline int __cbc_paes_set_key(struct s390_paes_ctx *ctx)
294{
295 int rc;
296 unsigned long fc;
297
298 rc = __paes_convert_key(ctx);
299 if (rc)
300 return rc;
301
302 /* Pick the correct function code based on the protected key type */
303 fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMC_PAES_128 :
304 (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KMC_PAES_192 :
305 (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? CPACF_KMC_PAES_256 : 0;
306
307 /* Check if the function code is available */
308 ctx->fc = (fc && cpacf_test_func(&kmc_functions, fc)) ? fc : 0;
309
310 return ctx->fc ? 0 : -EINVAL;
311}
312
313static int cbc_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
314 unsigned int key_len)
315{
316 int rc;
317 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
318
319 _free_kb_keybuf(&ctx->kb);
320 rc = _key_to_kb(&ctx->kb, in_key, key_len);
321 if (rc)
322 return rc;
323
324 return __cbc_paes_set_key(ctx);
325}
326
327static int cbc_paes_crypt(struct skcipher_request *req, unsigned long modifier)
328{
329 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
330 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
331 struct skcipher_walk walk;
332 unsigned int nbytes, n, k;
333 int ret;
334 struct {
335 u8 iv[AES_BLOCK_SIZE];
336 u8 key[MAXPROTKEYSIZE];
337 } param;
338
339 ret = skcipher_walk_virt(&walk, req, false);
340 if (ret)
341 return ret;
342
343 memcpy(param.iv, walk.iv, AES_BLOCK_SIZE);
344 spin_lock_bh(&ctx->pk_lock);
345 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
346 spin_unlock_bh(&ctx->pk_lock);
347
348 while ((nbytes = walk.nbytes) != 0) {
349 /* only use complete blocks */
350 n = nbytes & ~(AES_BLOCK_SIZE - 1);
351 k = cpacf_kmc(ctx->fc | modifier, ¶m,
352 walk.dst.virt.addr, walk.src.virt.addr, n);
353 if (k) {
354 memcpy(walk.iv, param.iv, AES_BLOCK_SIZE);
355 ret = skcipher_walk_done(&walk, nbytes - k);
356 }
357 if (k < n) {
358 if (__paes_convert_key(ctx))
359 return skcipher_walk_done(&walk, -EIO);
360 spin_lock_bh(&ctx->pk_lock);
361 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
362 spin_unlock_bh(&ctx->pk_lock);
363 }
364 }
365 return ret;
366}
367
368static int cbc_paes_encrypt(struct skcipher_request *req)
369{
370 return cbc_paes_crypt(req, 0);
371}
372
373static int cbc_paes_decrypt(struct skcipher_request *req)
374{
375 return cbc_paes_crypt(req, CPACF_DECRYPT);
376}
377
378static struct skcipher_alg cbc_paes_alg = {
379 .base.cra_name = "cbc(paes)",
380 .base.cra_driver_name = "cbc-paes-s390",
381 .base.cra_priority = 402, /* ecb-paes-s390 + 1 */
382 .base.cra_blocksize = AES_BLOCK_SIZE,
383 .base.cra_ctxsize = sizeof(struct s390_paes_ctx),
384 .base.cra_module = THIS_MODULE,
385 .base.cra_list = LIST_HEAD_INIT(cbc_paes_alg.base.cra_list),
386 .init = cbc_paes_init,
387 .exit = cbc_paes_exit,
388 .min_keysize = PAES_MIN_KEYSIZE,
389 .max_keysize = PAES_MAX_KEYSIZE,
390 .ivsize = AES_BLOCK_SIZE,
391 .setkey = cbc_paes_set_key,
392 .encrypt = cbc_paes_encrypt,
393 .decrypt = cbc_paes_decrypt,
394};
395
396static int xts_paes_init(struct crypto_skcipher *tfm)
397{
398 struct s390_pxts_ctx *ctx = crypto_skcipher_ctx(tfm);
399
400 ctx->kb[0].key = NULL;
401 ctx->kb[1].key = NULL;
402 spin_lock_init(&ctx->pk_lock);
403
404 return 0;
405}
406
407static void xts_paes_exit(struct crypto_skcipher *tfm)
408{
409 struct s390_pxts_ctx *ctx = crypto_skcipher_ctx(tfm);
410
411 _free_kb_keybuf(&ctx->kb[0]);
412 _free_kb_keybuf(&ctx->kb[1]);
413}
414
415static inline int __xts_paes_convert_key(struct s390_pxts_ctx *ctx)
416{
417 struct pkey_protkey pkey0, pkey1;
418
419 pkey0.len = sizeof(pkey0.protkey);
420 pkey1.len = sizeof(pkey1.protkey);
421
422 if (__paes_keyblob2pkey(&ctx->kb[0], &pkey0) ||
423 __paes_keyblob2pkey(&ctx->kb[1], &pkey1))
424 return -EINVAL;
425
426 spin_lock_bh(&ctx->pk_lock);
427 memcpy(&ctx->pk[0], &pkey0, sizeof(pkey0));
428 memcpy(&ctx->pk[1], &pkey1, sizeof(pkey1));
429 spin_unlock_bh(&ctx->pk_lock);
430
431 return 0;
432}
433
434static inline int __xts_paes_set_key(struct s390_pxts_ctx *ctx)
435{
436 unsigned long fc;
437
438 if (__xts_paes_convert_key(ctx))
439 return -EINVAL;
440
441 if (ctx->pk[0].type != ctx->pk[1].type)
442 return -EINVAL;
443
444 /* Pick the correct function code based on the protected key type */
445 fc = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PXTS_128 :
446 (ctx->pk[0].type == PKEY_KEYTYPE_AES_256) ?
447 CPACF_KM_PXTS_256 : 0;
448
449 /* Check if the function code is available */
450 ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
451
452 return ctx->fc ? 0 : -EINVAL;
453}
454
455static int xts_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
456 unsigned int xts_key_len)
457{
458 int rc;
459 struct s390_pxts_ctx *ctx = crypto_skcipher_ctx(tfm);
460 u8 ckey[2 * AES_MAX_KEY_SIZE];
461 unsigned int ckey_len, key_len;
462
463 if (xts_key_len % 2)
464 return -EINVAL;
465
466 key_len = xts_key_len / 2;
467
468 _free_kb_keybuf(&ctx->kb[0]);
469 _free_kb_keybuf(&ctx->kb[1]);
470 rc = _key_to_kb(&ctx->kb[0], in_key, key_len);
471 if (rc)
472 return rc;
473 rc = _key_to_kb(&ctx->kb[1], in_key + key_len, key_len);
474 if (rc)
475 return rc;
476
477 rc = __xts_paes_set_key(ctx);
478 if (rc)
479 return rc;
480
481 /*
482 * xts_verify_key verifies the key length is not odd and makes
483 * sure that the two keys are not the same. This can be done
484 * on the two protected keys as well
485 */
486 ckey_len = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ?
487 AES_KEYSIZE_128 : AES_KEYSIZE_256;
488 memcpy(ckey, ctx->pk[0].protkey, ckey_len);
489 memcpy(ckey + ckey_len, ctx->pk[1].protkey, ckey_len);
490 return xts_verify_key(tfm, ckey, 2*ckey_len);
491}
492
493static int xts_paes_crypt(struct skcipher_request *req, unsigned long modifier)
494{
495 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
496 struct s390_pxts_ctx *ctx = crypto_skcipher_ctx(tfm);
497 struct skcipher_walk walk;
498 unsigned int keylen, offset, nbytes, n, k;
499 int ret;
500 struct {
501 u8 key[MAXPROTKEYSIZE]; /* key + verification pattern */
502 u8 tweak[16];
503 u8 block[16];
504 u8 bit[16];
505 u8 xts[16];
506 } pcc_param;
507 struct {
508 u8 key[MAXPROTKEYSIZE]; /* key + verification pattern */
509 u8 init[16];
510 } xts_param;
511
512 ret = skcipher_walk_virt(&walk, req, false);
513 if (ret)
514 return ret;
515
516 keylen = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? 48 : 64;
517 offset = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? 16 : 0;
518
519 memset(&pcc_param, 0, sizeof(pcc_param));
520 memcpy(pcc_param.tweak, walk.iv, sizeof(pcc_param.tweak));
521 spin_lock_bh(&ctx->pk_lock);
522 memcpy(pcc_param.key + offset, ctx->pk[1].protkey, keylen);
523 memcpy(xts_param.key + offset, ctx->pk[0].protkey, keylen);
524 spin_unlock_bh(&ctx->pk_lock);
525 cpacf_pcc(ctx->fc, pcc_param.key + offset);
526 memcpy(xts_param.init, pcc_param.xts, 16);
527
528 while ((nbytes = walk.nbytes) != 0) {
529 /* only use complete blocks */
530 n = nbytes & ~(AES_BLOCK_SIZE - 1);
531 k = cpacf_km(ctx->fc | modifier, xts_param.key + offset,
532 walk.dst.virt.addr, walk.src.virt.addr, n);
533 if (k)
534 ret = skcipher_walk_done(&walk, nbytes - k);
535 if (k < n) {
536 if (__xts_paes_convert_key(ctx))
537 return skcipher_walk_done(&walk, -EIO);
538 spin_lock_bh(&ctx->pk_lock);
539 memcpy(xts_param.key + offset,
540 ctx->pk[0].protkey, keylen);
541 spin_unlock_bh(&ctx->pk_lock);
542 }
543 }
544
545 return ret;
546}
547
548static int xts_paes_encrypt(struct skcipher_request *req)
549{
550 return xts_paes_crypt(req, 0);
551}
552
553static int xts_paes_decrypt(struct skcipher_request *req)
554{
555 return xts_paes_crypt(req, CPACF_DECRYPT);
556}
557
558static struct skcipher_alg xts_paes_alg = {
559 .base.cra_name = "xts(paes)",
560 .base.cra_driver_name = "xts-paes-s390",
561 .base.cra_priority = 402, /* ecb-paes-s390 + 1 */
562 .base.cra_blocksize = AES_BLOCK_SIZE,
563 .base.cra_ctxsize = sizeof(struct s390_pxts_ctx),
564 .base.cra_module = THIS_MODULE,
565 .base.cra_list = LIST_HEAD_INIT(xts_paes_alg.base.cra_list),
566 .init = xts_paes_init,
567 .exit = xts_paes_exit,
568 .min_keysize = 2 * PAES_MIN_KEYSIZE,
569 .max_keysize = 2 * PAES_MAX_KEYSIZE,
570 .ivsize = AES_BLOCK_SIZE,
571 .setkey = xts_paes_set_key,
572 .encrypt = xts_paes_encrypt,
573 .decrypt = xts_paes_decrypt,
574};
575
576static int ctr_paes_init(struct crypto_skcipher *tfm)
577{
578 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
579
580 ctx->kb.key = NULL;
581 spin_lock_init(&ctx->pk_lock);
582
583 return 0;
584}
585
586static void ctr_paes_exit(struct crypto_skcipher *tfm)
587{
588 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
589
590 _free_kb_keybuf(&ctx->kb);
591}
592
593static inline int __ctr_paes_set_key(struct s390_paes_ctx *ctx)
594{
595 int rc;
596 unsigned long fc;
597
598 rc = __paes_convert_key(ctx);
599 if (rc)
600 return rc;
601
602 /* Pick the correct function code based on the protected key type */
603 fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMCTR_PAES_128 :
604 (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KMCTR_PAES_192 :
605 (ctx->pk.type == PKEY_KEYTYPE_AES_256) ?
606 CPACF_KMCTR_PAES_256 : 0;
607
608 /* Check if the function code is available */
609 ctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0;
610
611 return ctx->fc ? 0 : -EINVAL;
612}
613
614static int ctr_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
615 unsigned int key_len)
616{
617 int rc;
618 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
619
620 _free_kb_keybuf(&ctx->kb);
621 rc = _key_to_kb(&ctx->kb, in_key, key_len);
622 if (rc)
623 return rc;
624
625 return __ctr_paes_set_key(ctx);
626}
627
628static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
629{
630 unsigned int i, n;
631
632 /* only use complete blocks, max. PAGE_SIZE */
633 memcpy(ctrptr, iv, AES_BLOCK_SIZE);
634 n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);
635 for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) {
636 memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE);
637 crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE);
638 ctrptr += AES_BLOCK_SIZE;
639 }
640 return n;
641}
642
643static int ctr_paes_crypt(struct skcipher_request *req)
644{
645 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
646 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
647 u8 buf[AES_BLOCK_SIZE], *ctrptr;
648 struct skcipher_walk walk;
649 unsigned int nbytes, n, k;
650 int ret, locked;
651 struct {
652 u8 key[MAXPROTKEYSIZE];
653 } param;
654
655 ret = skcipher_walk_virt(&walk, req, false);
656 if (ret)
657 return ret;
658
659 spin_lock_bh(&ctx->pk_lock);
660 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
661 spin_unlock_bh(&ctx->pk_lock);
662
663 locked = mutex_trylock(&ctrblk_lock);
664
665 while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
666 n = AES_BLOCK_SIZE;
667 if (nbytes >= 2*AES_BLOCK_SIZE && locked)
668 n = __ctrblk_init(ctrblk, walk.iv, nbytes);
669 ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk.iv;
670 k = cpacf_kmctr(ctx->fc, ¶m, walk.dst.virt.addr,
671 walk.src.virt.addr, n, ctrptr);
672 if (k) {
673 if (ctrptr == ctrblk)
674 memcpy(walk.iv, ctrptr + k - AES_BLOCK_SIZE,
675 AES_BLOCK_SIZE);
676 crypto_inc(walk.iv, AES_BLOCK_SIZE);
677 ret = skcipher_walk_done(&walk, nbytes - k);
678 }
679 if (k < n) {
680 if (__paes_convert_key(ctx)) {
681 if (locked)
682 mutex_unlock(&ctrblk_lock);
683 return skcipher_walk_done(&walk, -EIO);
684 }
685 spin_lock_bh(&ctx->pk_lock);
686 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
687 spin_unlock_bh(&ctx->pk_lock);
688 }
689 }
690 if (locked)
691 mutex_unlock(&ctrblk_lock);
692 /*
693 * final block may be < AES_BLOCK_SIZE, copy only nbytes
694 */
695 if (nbytes) {
696 memset(buf, 0, AES_BLOCK_SIZE);
697 memcpy(buf, walk.src.virt.addr, nbytes);
698 while (1) {
699 if (cpacf_kmctr(ctx->fc, ¶m, buf,
700 buf, AES_BLOCK_SIZE,
701 walk.iv) == AES_BLOCK_SIZE)
702 break;
703 if (__paes_convert_key(ctx))
704 return skcipher_walk_done(&walk, -EIO);
705 spin_lock_bh(&ctx->pk_lock);
706 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
707 spin_unlock_bh(&ctx->pk_lock);
708 }
709 memcpy(walk.dst.virt.addr, buf, nbytes);
710 crypto_inc(walk.iv, AES_BLOCK_SIZE);
711 ret = skcipher_walk_done(&walk, nbytes);
712 }
713
714 return ret;
715}
716
717static struct skcipher_alg ctr_paes_alg = {
718 .base.cra_name = "ctr(paes)",
719 .base.cra_driver_name = "ctr-paes-s390",
720 .base.cra_priority = 402, /* ecb-paes-s390 + 1 */
721 .base.cra_blocksize = 1,
722 .base.cra_ctxsize = sizeof(struct s390_paes_ctx),
723 .base.cra_module = THIS_MODULE,
724 .base.cra_list = LIST_HEAD_INIT(ctr_paes_alg.base.cra_list),
725 .init = ctr_paes_init,
726 .exit = ctr_paes_exit,
727 .min_keysize = PAES_MIN_KEYSIZE,
728 .max_keysize = PAES_MAX_KEYSIZE,
729 .ivsize = AES_BLOCK_SIZE,
730 .setkey = ctr_paes_set_key,
731 .encrypt = ctr_paes_crypt,
732 .decrypt = ctr_paes_crypt,
733 .chunksize = AES_BLOCK_SIZE,
734};
735
736static inline void __crypto_unregister_skcipher(struct skcipher_alg *alg)
737{
738 if (!list_empty(&alg->base.cra_list))
739 crypto_unregister_skcipher(alg);
740}
741
742static void paes_s390_fini(void)
743{
744 __crypto_unregister_skcipher(&ctr_paes_alg);
745 __crypto_unregister_skcipher(&xts_paes_alg);
746 __crypto_unregister_skcipher(&cbc_paes_alg);
747 __crypto_unregister_skcipher(&ecb_paes_alg);
748 if (ctrblk)
749 free_page((unsigned long) ctrblk);
750}
751
752static int __init paes_s390_init(void)
753{
754 int ret;
755
756 /* Query available functions for KM, KMC and KMCTR */
757 cpacf_query(CPACF_KM, &km_functions);
758 cpacf_query(CPACF_KMC, &kmc_functions);
759 cpacf_query(CPACF_KMCTR, &kmctr_functions);
760
761 if (cpacf_test_func(&km_functions, CPACF_KM_PAES_128) ||
762 cpacf_test_func(&km_functions, CPACF_KM_PAES_192) ||
763 cpacf_test_func(&km_functions, CPACF_KM_PAES_256)) {
764 ret = crypto_register_skcipher(&ecb_paes_alg);
765 if (ret)
766 goto out_err;
767 }
768
769 if (cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_128) ||
770 cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_192) ||
771 cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_256)) {
772 ret = crypto_register_skcipher(&cbc_paes_alg);
773 if (ret)
774 goto out_err;
775 }
776
777 if (cpacf_test_func(&km_functions, CPACF_KM_PXTS_128) ||
778 cpacf_test_func(&km_functions, CPACF_KM_PXTS_256)) {
779 ret = crypto_register_skcipher(&xts_paes_alg);
780 if (ret)
781 goto out_err;
782 }
783
784 if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_128) ||
785 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_192) ||
786 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_256)) {
787 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
788 if (!ctrblk) {
789 ret = -ENOMEM;
790 goto out_err;
791 }
792 ret = crypto_register_skcipher(&ctr_paes_alg);
793 if (ret)
794 goto out_err;
795 }
796
797 return 0;
798out_err:
799 paes_s390_fini();
800 return ret;
801}
802
803module_init(paes_s390_init);
804module_exit(paes_s390_fini);
805
806MODULE_ALIAS_CRYPTO("paes");
807
808MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm with protected keys");
809MODULE_LICENSE("GPL");
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Cryptographic API.
4 *
5 * s390 implementation of the AES Cipher Algorithm with protected keys.
6 *
7 * s390 Version:
8 * Copyright IBM Corp. 2017, 2023
9 * Author(s): Martin Schwidefsky <schwidefsky@de.ibm.com>
10 * Harald Freudenberger <freude@de.ibm.com>
11 */
12
13#define KMSG_COMPONENT "paes_s390"
14#define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
15
16#include <crypto/aes.h>
17#include <crypto/algapi.h>
18#include <linux/bug.h>
19#include <linux/err.h>
20#include <linux/module.h>
21#include <linux/cpufeature.h>
22#include <linux/init.h>
23#include <linux/mutex.h>
24#include <linux/spinlock.h>
25#include <linux/delay.h>
26#include <crypto/internal/skcipher.h>
27#include <crypto/xts.h>
28#include <asm/cpacf.h>
29#include <asm/pkey.h>
30
31/*
32 * Key blobs smaller/bigger than these defines are rejected
33 * by the common code even before the individual setkey function
34 * is called. As paes can handle different kinds of key blobs
35 * and padding is also possible, the limits need to be generous.
36 */
37#define PAES_MIN_KEYSIZE 16
38#define PAES_MAX_KEYSIZE MAXEP11AESKEYBLOBSIZE
39
40static u8 *ctrblk;
41static DEFINE_MUTEX(ctrblk_lock);
42
43static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
44
45struct key_blob {
46 /*
47 * Small keys will be stored in the keybuf. Larger keys are
48 * stored in extra allocated memory. In both cases does
49 * key point to the memory where the key is stored.
50 * The code distinguishes by checking keylen against
51 * sizeof(keybuf). See the two following helper functions.
52 */
53 u8 *key;
54 u8 keybuf[128];
55 unsigned int keylen;
56};
57
58static inline int _key_to_kb(struct key_blob *kb,
59 const u8 *key,
60 unsigned int keylen)
61{
62 struct clearkey_header {
63 u8 type;
64 u8 res0[3];
65 u8 version;
66 u8 res1[3];
67 u32 keytype;
68 u32 len;
69 } __packed * h;
70
71 switch (keylen) {
72 case 16:
73 case 24:
74 case 32:
75 /* clear key value, prepare pkey clear key token in keybuf */
76 memset(kb->keybuf, 0, sizeof(kb->keybuf));
77 h = (struct clearkey_header *) kb->keybuf;
78 h->version = 0x02; /* TOKVER_CLEAR_KEY */
79 h->keytype = (keylen - 8) >> 3;
80 h->len = keylen;
81 memcpy(kb->keybuf + sizeof(*h), key, keylen);
82 kb->keylen = sizeof(*h) + keylen;
83 kb->key = kb->keybuf;
84 break;
85 default:
86 /* other key material, let pkey handle this */
87 if (keylen <= sizeof(kb->keybuf))
88 kb->key = kb->keybuf;
89 else {
90 kb->key = kmalloc(keylen, GFP_KERNEL);
91 if (!kb->key)
92 return -ENOMEM;
93 }
94 memcpy(kb->key, key, keylen);
95 kb->keylen = keylen;
96 break;
97 }
98
99 return 0;
100}
101
102static inline void _free_kb_keybuf(struct key_blob *kb)
103{
104 if (kb->key && kb->key != kb->keybuf
105 && kb->keylen > sizeof(kb->keybuf)) {
106 kfree_sensitive(kb->key);
107 kb->key = NULL;
108 }
109}
110
111struct s390_paes_ctx {
112 struct key_blob kb;
113 struct pkey_protkey pk;
114 spinlock_t pk_lock;
115 unsigned long fc;
116};
117
118struct s390_pxts_ctx {
119 struct key_blob kb[2];
120 struct pkey_protkey pk[2];
121 spinlock_t pk_lock;
122 unsigned long fc;
123};
124
125static inline int __paes_keyblob2pkey(struct key_blob *kb,
126 struct pkey_protkey *pk)
127{
128 int i, ret = -EIO;
129
130 /* try three times in case of busy card */
131 for (i = 0; ret && i < 3; i++) {
132 if (ret == -EBUSY && in_task()) {
133 if (msleep_interruptible(1000))
134 return -EINTR;
135 }
136 ret = pkey_keyblob2pkey(kb->key, kb->keylen,
137 pk->protkey, &pk->len, &pk->type);
138 }
139
140 return ret;
141}
142
143static inline int __paes_convert_key(struct s390_paes_ctx *ctx)
144{
145 int ret;
146 struct pkey_protkey pkey;
147
148 pkey.len = sizeof(pkey.protkey);
149 ret = __paes_keyblob2pkey(&ctx->kb, &pkey);
150 if (ret)
151 return ret;
152
153 spin_lock_bh(&ctx->pk_lock);
154 memcpy(&ctx->pk, &pkey, sizeof(pkey));
155 spin_unlock_bh(&ctx->pk_lock);
156
157 return 0;
158}
159
160static int ecb_paes_init(struct crypto_skcipher *tfm)
161{
162 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
163
164 ctx->kb.key = NULL;
165 spin_lock_init(&ctx->pk_lock);
166
167 return 0;
168}
169
170static void ecb_paes_exit(struct crypto_skcipher *tfm)
171{
172 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
173
174 _free_kb_keybuf(&ctx->kb);
175}
176
177static inline int __ecb_paes_set_key(struct s390_paes_ctx *ctx)
178{
179 int rc;
180 unsigned long fc;
181
182 rc = __paes_convert_key(ctx);
183 if (rc)
184 return rc;
185
186 /* Pick the correct function code based on the protected key type */
187 fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PAES_128 :
188 (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KM_PAES_192 :
189 (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? CPACF_KM_PAES_256 : 0;
190
191 /* Check if the function code is available */
192 ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
193
194 return ctx->fc ? 0 : -EINVAL;
195}
196
197static int ecb_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
198 unsigned int key_len)
199{
200 int rc;
201 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
202
203 _free_kb_keybuf(&ctx->kb);
204 rc = _key_to_kb(&ctx->kb, in_key, key_len);
205 if (rc)
206 return rc;
207
208 return __ecb_paes_set_key(ctx);
209}
210
211static int ecb_paes_crypt(struct skcipher_request *req, unsigned long modifier)
212{
213 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
214 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
215 struct skcipher_walk walk;
216 unsigned int nbytes, n, k;
217 int ret;
218 struct {
219 u8 key[MAXPROTKEYSIZE];
220 } param;
221
222 ret = skcipher_walk_virt(&walk, req, false);
223 if (ret)
224 return ret;
225
226 spin_lock_bh(&ctx->pk_lock);
227 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
228 spin_unlock_bh(&ctx->pk_lock);
229
230 while ((nbytes = walk.nbytes) != 0) {
231 /* only use complete blocks */
232 n = nbytes & ~(AES_BLOCK_SIZE - 1);
233 k = cpacf_km(ctx->fc | modifier, ¶m,
234 walk.dst.virt.addr, walk.src.virt.addr, n);
235 if (k)
236 ret = skcipher_walk_done(&walk, nbytes - k);
237 if (k < n) {
238 if (__paes_convert_key(ctx))
239 return skcipher_walk_done(&walk, -EIO);
240 spin_lock_bh(&ctx->pk_lock);
241 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
242 spin_unlock_bh(&ctx->pk_lock);
243 }
244 }
245 return ret;
246}
247
248static int ecb_paes_encrypt(struct skcipher_request *req)
249{
250 return ecb_paes_crypt(req, 0);
251}
252
253static int ecb_paes_decrypt(struct skcipher_request *req)
254{
255 return ecb_paes_crypt(req, CPACF_DECRYPT);
256}
257
258static struct skcipher_alg ecb_paes_alg = {
259 .base.cra_name = "ecb(paes)",
260 .base.cra_driver_name = "ecb-paes-s390",
261 .base.cra_priority = 401, /* combo: aes + ecb + 1 */
262 .base.cra_blocksize = AES_BLOCK_SIZE,
263 .base.cra_ctxsize = sizeof(struct s390_paes_ctx),
264 .base.cra_module = THIS_MODULE,
265 .base.cra_list = LIST_HEAD_INIT(ecb_paes_alg.base.cra_list),
266 .init = ecb_paes_init,
267 .exit = ecb_paes_exit,
268 .min_keysize = PAES_MIN_KEYSIZE,
269 .max_keysize = PAES_MAX_KEYSIZE,
270 .setkey = ecb_paes_set_key,
271 .encrypt = ecb_paes_encrypt,
272 .decrypt = ecb_paes_decrypt,
273};
274
275static int cbc_paes_init(struct crypto_skcipher *tfm)
276{
277 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
278
279 ctx->kb.key = NULL;
280 spin_lock_init(&ctx->pk_lock);
281
282 return 0;
283}
284
285static void cbc_paes_exit(struct crypto_skcipher *tfm)
286{
287 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
288
289 _free_kb_keybuf(&ctx->kb);
290}
291
292static inline int __cbc_paes_set_key(struct s390_paes_ctx *ctx)
293{
294 int rc;
295 unsigned long fc;
296
297 rc = __paes_convert_key(ctx);
298 if (rc)
299 return rc;
300
301 /* Pick the correct function code based on the protected key type */
302 fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMC_PAES_128 :
303 (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KMC_PAES_192 :
304 (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? CPACF_KMC_PAES_256 : 0;
305
306 /* Check if the function code is available */
307 ctx->fc = (fc && cpacf_test_func(&kmc_functions, fc)) ? fc : 0;
308
309 return ctx->fc ? 0 : -EINVAL;
310}
311
312static int cbc_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
313 unsigned int key_len)
314{
315 int rc;
316 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
317
318 _free_kb_keybuf(&ctx->kb);
319 rc = _key_to_kb(&ctx->kb, in_key, key_len);
320 if (rc)
321 return rc;
322
323 return __cbc_paes_set_key(ctx);
324}
325
326static int cbc_paes_crypt(struct skcipher_request *req, unsigned long modifier)
327{
328 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
329 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
330 struct skcipher_walk walk;
331 unsigned int nbytes, n, k;
332 int ret;
333 struct {
334 u8 iv[AES_BLOCK_SIZE];
335 u8 key[MAXPROTKEYSIZE];
336 } param;
337
338 ret = skcipher_walk_virt(&walk, req, false);
339 if (ret)
340 return ret;
341
342 memcpy(param.iv, walk.iv, AES_BLOCK_SIZE);
343 spin_lock_bh(&ctx->pk_lock);
344 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
345 spin_unlock_bh(&ctx->pk_lock);
346
347 while ((nbytes = walk.nbytes) != 0) {
348 /* only use complete blocks */
349 n = nbytes & ~(AES_BLOCK_SIZE - 1);
350 k = cpacf_kmc(ctx->fc | modifier, ¶m,
351 walk.dst.virt.addr, walk.src.virt.addr, n);
352 if (k) {
353 memcpy(walk.iv, param.iv, AES_BLOCK_SIZE);
354 ret = skcipher_walk_done(&walk, nbytes - k);
355 }
356 if (k < n) {
357 if (__paes_convert_key(ctx))
358 return skcipher_walk_done(&walk, -EIO);
359 spin_lock_bh(&ctx->pk_lock);
360 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
361 spin_unlock_bh(&ctx->pk_lock);
362 }
363 }
364 return ret;
365}
366
367static int cbc_paes_encrypt(struct skcipher_request *req)
368{
369 return cbc_paes_crypt(req, 0);
370}
371
372static int cbc_paes_decrypt(struct skcipher_request *req)
373{
374 return cbc_paes_crypt(req, CPACF_DECRYPT);
375}
376
377static struct skcipher_alg cbc_paes_alg = {
378 .base.cra_name = "cbc(paes)",
379 .base.cra_driver_name = "cbc-paes-s390",
380 .base.cra_priority = 402, /* ecb-paes-s390 + 1 */
381 .base.cra_blocksize = AES_BLOCK_SIZE,
382 .base.cra_ctxsize = sizeof(struct s390_paes_ctx),
383 .base.cra_module = THIS_MODULE,
384 .base.cra_list = LIST_HEAD_INIT(cbc_paes_alg.base.cra_list),
385 .init = cbc_paes_init,
386 .exit = cbc_paes_exit,
387 .min_keysize = PAES_MIN_KEYSIZE,
388 .max_keysize = PAES_MAX_KEYSIZE,
389 .ivsize = AES_BLOCK_SIZE,
390 .setkey = cbc_paes_set_key,
391 .encrypt = cbc_paes_encrypt,
392 .decrypt = cbc_paes_decrypt,
393};
394
395static int xts_paes_init(struct crypto_skcipher *tfm)
396{
397 struct s390_pxts_ctx *ctx = crypto_skcipher_ctx(tfm);
398
399 ctx->kb[0].key = NULL;
400 ctx->kb[1].key = NULL;
401 spin_lock_init(&ctx->pk_lock);
402
403 return 0;
404}
405
406static void xts_paes_exit(struct crypto_skcipher *tfm)
407{
408 struct s390_pxts_ctx *ctx = crypto_skcipher_ctx(tfm);
409
410 _free_kb_keybuf(&ctx->kb[0]);
411 _free_kb_keybuf(&ctx->kb[1]);
412}
413
414static inline int __xts_paes_convert_key(struct s390_pxts_ctx *ctx)
415{
416 struct pkey_protkey pkey0, pkey1;
417
418 pkey0.len = sizeof(pkey0.protkey);
419 pkey1.len = sizeof(pkey1.protkey);
420
421 if (__paes_keyblob2pkey(&ctx->kb[0], &pkey0) ||
422 __paes_keyblob2pkey(&ctx->kb[1], &pkey1))
423 return -EINVAL;
424
425 spin_lock_bh(&ctx->pk_lock);
426 memcpy(&ctx->pk[0], &pkey0, sizeof(pkey0));
427 memcpy(&ctx->pk[1], &pkey1, sizeof(pkey1));
428 spin_unlock_bh(&ctx->pk_lock);
429
430 return 0;
431}
432
433static inline int __xts_paes_set_key(struct s390_pxts_ctx *ctx)
434{
435 unsigned long fc;
436
437 if (__xts_paes_convert_key(ctx))
438 return -EINVAL;
439
440 if (ctx->pk[0].type != ctx->pk[1].type)
441 return -EINVAL;
442
443 /* Pick the correct function code based on the protected key type */
444 fc = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PXTS_128 :
445 (ctx->pk[0].type == PKEY_KEYTYPE_AES_256) ?
446 CPACF_KM_PXTS_256 : 0;
447
448 /* Check if the function code is available */
449 ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
450
451 return ctx->fc ? 0 : -EINVAL;
452}
453
454static int xts_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
455 unsigned int xts_key_len)
456{
457 int rc;
458 struct s390_pxts_ctx *ctx = crypto_skcipher_ctx(tfm);
459 u8 ckey[2 * AES_MAX_KEY_SIZE];
460 unsigned int ckey_len, key_len;
461
462 if (xts_key_len % 2)
463 return -EINVAL;
464
465 key_len = xts_key_len / 2;
466
467 _free_kb_keybuf(&ctx->kb[0]);
468 _free_kb_keybuf(&ctx->kb[1]);
469 rc = _key_to_kb(&ctx->kb[0], in_key, key_len);
470 if (rc)
471 return rc;
472 rc = _key_to_kb(&ctx->kb[1], in_key + key_len, key_len);
473 if (rc)
474 return rc;
475
476 rc = __xts_paes_set_key(ctx);
477 if (rc)
478 return rc;
479
480 /*
481 * xts_verify_key verifies the key length is not odd and makes
482 * sure that the two keys are not the same. This can be done
483 * on the two protected keys as well
484 */
485 ckey_len = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ?
486 AES_KEYSIZE_128 : AES_KEYSIZE_256;
487 memcpy(ckey, ctx->pk[0].protkey, ckey_len);
488 memcpy(ckey + ckey_len, ctx->pk[1].protkey, ckey_len);
489 return xts_verify_key(tfm, ckey, 2*ckey_len);
490}
491
492static int xts_paes_crypt(struct skcipher_request *req, unsigned long modifier)
493{
494 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
495 struct s390_pxts_ctx *ctx = crypto_skcipher_ctx(tfm);
496 struct skcipher_walk walk;
497 unsigned int keylen, offset, nbytes, n, k;
498 int ret;
499 struct {
500 u8 key[MAXPROTKEYSIZE]; /* key + verification pattern */
501 u8 tweak[16];
502 u8 block[16];
503 u8 bit[16];
504 u8 xts[16];
505 } pcc_param;
506 struct {
507 u8 key[MAXPROTKEYSIZE]; /* key + verification pattern */
508 u8 init[16];
509 } xts_param;
510
511 ret = skcipher_walk_virt(&walk, req, false);
512 if (ret)
513 return ret;
514
515 keylen = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? 48 : 64;
516 offset = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? 16 : 0;
517
518 memset(&pcc_param, 0, sizeof(pcc_param));
519 memcpy(pcc_param.tweak, walk.iv, sizeof(pcc_param.tweak));
520 spin_lock_bh(&ctx->pk_lock);
521 memcpy(pcc_param.key + offset, ctx->pk[1].protkey, keylen);
522 memcpy(xts_param.key + offset, ctx->pk[0].protkey, keylen);
523 spin_unlock_bh(&ctx->pk_lock);
524 cpacf_pcc(ctx->fc, pcc_param.key + offset);
525 memcpy(xts_param.init, pcc_param.xts, 16);
526
527 while ((nbytes = walk.nbytes) != 0) {
528 /* only use complete blocks */
529 n = nbytes & ~(AES_BLOCK_SIZE - 1);
530 k = cpacf_km(ctx->fc | modifier, xts_param.key + offset,
531 walk.dst.virt.addr, walk.src.virt.addr, n);
532 if (k)
533 ret = skcipher_walk_done(&walk, nbytes - k);
534 if (k < n) {
535 if (__xts_paes_convert_key(ctx))
536 return skcipher_walk_done(&walk, -EIO);
537 spin_lock_bh(&ctx->pk_lock);
538 memcpy(xts_param.key + offset,
539 ctx->pk[0].protkey, keylen);
540 spin_unlock_bh(&ctx->pk_lock);
541 }
542 }
543
544 return ret;
545}
546
547static int xts_paes_encrypt(struct skcipher_request *req)
548{
549 return xts_paes_crypt(req, 0);
550}
551
552static int xts_paes_decrypt(struct skcipher_request *req)
553{
554 return xts_paes_crypt(req, CPACF_DECRYPT);
555}
556
557static struct skcipher_alg xts_paes_alg = {
558 .base.cra_name = "xts(paes)",
559 .base.cra_driver_name = "xts-paes-s390",
560 .base.cra_priority = 402, /* ecb-paes-s390 + 1 */
561 .base.cra_blocksize = AES_BLOCK_SIZE,
562 .base.cra_ctxsize = sizeof(struct s390_pxts_ctx),
563 .base.cra_module = THIS_MODULE,
564 .base.cra_list = LIST_HEAD_INIT(xts_paes_alg.base.cra_list),
565 .init = xts_paes_init,
566 .exit = xts_paes_exit,
567 .min_keysize = 2 * PAES_MIN_KEYSIZE,
568 .max_keysize = 2 * PAES_MAX_KEYSIZE,
569 .ivsize = AES_BLOCK_SIZE,
570 .setkey = xts_paes_set_key,
571 .encrypt = xts_paes_encrypt,
572 .decrypt = xts_paes_decrypt,
573};
574
575static int ctr_paes_init(struct crypto_skcipher *tfm)
576{
577 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
578
579 ctx->kb.key = NULL;
580 spin_lock_init(&ctx->pk_lock);
581
582 return 0;
583}
584
585static void ctr_paes_exit(struct crypto_skcipher *tfm)
586{
587 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
588
589 _free_kb_keybuf(&ctx->kb);
590}
591
592static inline int __ctr_paes_set_key(struct s390_paes_ctx *ctx)
593{
594 int rc;
595 unsigned long fc;
596
597 rc = __paes_convert_key(ctx);
598 if (rc)
599 return rc;
600
601 /* Pick the correct function code based on the protected key type */
602 fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMCTR_PAES_128 :
603 (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KMCTR_PAES_192 :
604 (ctx->pk.type == PKEY_KEYTYPE_AES_256) ?
605 CPACF_KMCTR_PAES_256 : 0;
606
607 /* Check if the function code is available */
608 ctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0;
609
610 return ctx->fc ? 0 : -EINVAL;
611}
612
613static int ctr_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
614 unsigned int key_len)
615{
616 int rc;
617 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
618
619 _free_kb_keybuf(&ctx->kb);
620 rc = _key_to_kb(&ctx->kb, in_key, key_len);
621 if (rc)
622 return rc;
623
624 return __ctr_paes_set_key(ctx);
625}
626
627static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
628{
629 unsigned int i, n;
630
631 /* only use complete blocks, max. PAGE_SIZE */
632 memcpy(ctrptr, iv, AES_BLOCK_SIZE);
633 n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);
634 for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) {
635 memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE);
636 crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE);
637 ctrptr += AES_BLOCK_SIZE;
638 }
639 return n;
640}
641
642static int ctr_paes_crypt(struct skcipher_request *req)
643{
644 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
645 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
646 u8 buf[AES_BLOCK_SIZE], *ctrptr;
647 struct skcipher_walk walk;
648 unsigned int nbytes, n, k;
649 int ret, locked;
650 struct {
651 u8 key[MAXPROTKEYSIZE];
652 } param;
653
654 ret = skcipher_walk_virt(&walk, req, false);
655 if (ret)
656 return ret;
657
658 spin_lock_bh(&ctx->pk_lock);
659 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
660 spin_unlock_bh(&ctx->pk_lock);
661
662 locked = mutex_trylock(&ctrblk_lock);
663
664 while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
665 n = AES_BLOCK_SIZE;
666 if (nbytes >= 2*AES_BLOCK_SIZE && locked)
667 n = __ctrblk_init(ctrblk, walk.iv, nbytes);
668 ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk.iv;
669 k = cpacf_kmctr(ctx->fc, ¶m, walk.dst.virt.addr,
670 walk.src.virt.addr, n, ctrptr);
671 if (k) {
672 if (ctrptr == ctrblk)
673 memcpy(walk.iv, ctrptr + k - AES_BLOCK_SIZE,
674 AES_BLOCK_SIZE);
675 crypto_inc(walk.iv, AES_BLOCK_SIZE);
676 ret = skcipher_walk_done(&walk, nbytes - k);
677 }
678 if (k < n) {
679 if (__paes_convert_key(ctx)) {
680 if (locked)
681 mutex_unlock(&ctrblk_lock);
682 return skcipher_walk_done(&walk, -EIO);
683 }
684 spin_lock_bh(&ctx->pk_lock);
685 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
686 spin_unlock_bh(&ctx->pk_lock);
687 }
688 }
689 if (locked)
690 mutex_unlock(&ctrblk_lock);
691 /*
692 * final block may be < AES_BLOCK_SIZE, copy only nbytes
693 */
694 if (nbytes) {
695 memset(buf, 0, AES_BLOCK_SIZE);
696 memcpy(buf, walk.src.virt.addr, nbytes);
697 while (1) {
698 if (cpacf_kmctr(ctx->fc, ¶m, buf,
699 buf, AES_BLOCK_SIZE,
700 walk.iv) == AES_BLOCK_SIZE)
701 break;
702 if (__paes_convert_key(ctx))
703 return skcipher_walk_done(&walk, -EIO);
704 spin_lock_bh(&ctx->pk_lock);
705 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
706 spin_unlock_bh(&ctx->pk_lock);
707 }
708 memcpy(walk.dst.virt.addr, buf, nbytes);
709 crypto_inc(walk.iv, AES_BLOCK_SIZE);
710 ret = skcipher_walk_done(&walk, nbytes);
711 }
712
713 return ret;
714}
715
716static struct skcipher_alg ctr_paes_alg = {
717 .base.cra_name = "ctr(paes)",
718 .base.cra_driver_name = "ctr-paes-s390",
719 .base.cra_priority = 402, /* ecb-paes-s390 + 1 */
720 .base.cra_blocksize = 1,
721 .base.cra_ctxsize = sizeof(struct s390_paes_ctx),
722 .base.cra_module = THIS_MODULE,
723 .base.cra_list = LIST_HEAD_INIT(ctr_paes_alg.base.cra_list),
724 .init = ctr_paes_init,
725 .exit = ctr_paes_exit,
726 .min_keysize = PAES_MIN_KEYSIZE,
727 .max_keysize = PAES_MAX_KEYSIZE,
728 .ivsize = AES_BLOCK_SIZE,
729 .setkey = ctr_paes_set_key,
730 .encrypt = ctr_paes_crypt,
731 .decrypt = ctr_paes_crypt,
732 .chunksize = AES_BLOCK_SIZE,
733};
734
735static inline void __crypto_unregister_skcipher(struct skcipher_alg *alg)
736{
737 if (!list_empty(&alg->base.cra_list))
738 crypto_unregister_skcipher(alg);
739}
740
741static void paes_s390_fini(void)
742{
743 __crypto_unregister_skcipher(&ctr_paes_alg);
744 __crypto_unregister_skcipher(&xts_paes_alg);
745 __crypto_unregister_skcipher(&cbc_paes_alg);
746 __crypto_unregister_skcipher(&ecb_paes_alg);
747 if (ctrblk)
748 free_page((unsigned long) ctrblk);
749}
750
751static int __init paes_s390_init(void)
752{
753 int ret;
754
755 /* Query available functions for KM, KMC and KMCTR */
756 cpacf_query(CPACF_KM, &km_functions);
757 cpacf_query(CPACF_KMC, &kmc_functions);
758 cpacf_query(CPACF_KMCTR, &kmctr_functions);
759
760 if (cpacf_test_func(&km_functions, CPACF_KM_PAES_128) ||
761 cpacf_test_func(&km_functions, CPACF_KM_PAES_192) ||
762 cpacf_test_func(&km_functions, CPACF_KM_PAES_256)) {
763 ret = crypto_register_skcipher(&ecb_paes_alg);
764 if (ret)
765 goto out_err;
766 }
767
768 if (cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_128) ||
769 cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_192) ||
770 cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_256)) {
771 ret = crypto_register_skcipher(&cbc_paes_alg);
772 if (ret)
773 goto out_err;
774 }
775
776 if (cpacf_test_func(&km_functions, CPACF_KM_PXTS_128) ||
777 cpacf_test_func(&km_functions, CPACF_KM_PXTS_256)) {
778 ret = crypto_register_skcipher(&xts_paes_alg);
779 if (ret)
780 goto out_err;
781 }
782
783 if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_128) ||
784 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_192) ||
785 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_256)) {
786 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
787 if (!ctrblk) {
788 ret = -ENOMEM;
789 goto out_err;
790 }
791 ret = crypto_register_skcipher(&ctr_paes_alg);
792 if (ret)
793 goto out_err;
794 }
795
796 return 0;
797out_err:
798 paes_s390_fini();
799 return ret;
800}
801
802module_init(paes_s390_init);
803module_exit(paes_s390_fini);
804
805MODULE_ALIAS_CRYPTO("paes");
806
807MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm with protected keys");
808MODULE_LICENSE("GPL");