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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
33
34
35
36
37#define PAES_MIN_KEYSIZE 16
38#define PAES_MAX_KEYSIZE 320
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
48
49
50
51
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
76 memset(kb->keybuf, 0, sizeof(kb->keybuf));
77 h = (struct clearkey_header *) kb->keybuf;
78 h->version = 0x02;
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
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(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
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, pk);
136 if (ret == 0)
137 break;
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 ret = __paes_keyblob2pkey(&ctx->kb, &pkey);
149 if (ret)
150 return ret;
151
152 spin_lock_bh(&ctx->pk_lock);
153 memcpy(&ctx->pk, &pkey, sizeof(pkey));
154 spin_unlock_bh(&ctx->pk_lock);
155
156 return 0;
157}
158
159static int ecb_paes_init(struct crypto_skcipher *tfm)
160{
161 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
162
163 ctx->kb.key = NULL;
164 spin_lock_init(&ctx->pk_lock);
165
166 return 0;
167}
168
169static void ecb_paes_exit(struct crypto_skcipher *tfm)
170{
171 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
172
173 _free_kb_keybuf(&ctx->kb);
174}
175
176static inline int __ecb_paes_set_key(struct s390_paes_ctx *ctx)
177{
178 int rc;
179 unsigned long fc;
180
181 rc = __paes_convert_key(ctx);
182 if (rc)
183 return rc;
184
185
186 fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PAES_128 :
187 (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KM_PAES_192 :
188 (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? CPACF_KM_PAES_256 : 0;
189
190
191 ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
192
193 return ctx->fc ? 0 : -EINVAL;
194}
195
196static int ecb_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
197 unsigned int key_len)
198{
199 int rc;
200 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
201
202 _free_kb_keybuf(&ctx->kb);
203 rc = _key_to_kb(&ctx->kb, in_key, key_len);
204 if (rc)
205 return rc;
206
207 return __ecb_paes_set_key(ctx);
208}
209
210static int ecb_paes_crypt(struct skcipher_request *req, unsigned long modifier)
211{
212 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
213 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
214 struct skcipher_walk walk;
215 unsigned int nbytes, n, k;
216 int ret;
217 struct {
218 u8 key[MAXPROTKEYSIZE];
219 } param;
220
221 ret = skcipher_walk_virt(&walk, req, false);
222 if (ret)
223 return ret;
224
225 spin_lock_bh(&ctx->pk_lock);
226 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
227 spin_unlock_bh(&ctx->pk_lock);
228
229 while ((nbytes = walk.nbytes) != 0) {
230
231 n = nbytes & ~(AES_BLOCK_SIZE - 1);
232 k = cpacf_km(ctx->fc | modifier, ¶m,
233 walk.dst.virt.addr, walk.src.virt.addr, n);
234 if (k)
235 ret = skcipher_walk_done(&walk, nbytes - k);
236 if (k < n) {
237 if (__paes_convert_key(ctx))
238 return skcipher_walk_done(&walk, -EIO);
239 spin_lock_bh(&ctx->pk_lock);
240 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
241 spin_unlock_bh(&ctx->pk_lock);
242 }
243 }
244 return ret;
245}
246
247static int ecb_paes_encrypt(struct skcipher_request *req)
248{
249 return ecb_paes_crypt(req, 0);
250}
251
252static int ecb_paes_decrypt(struct skcipher_request *req)
253{
254 return ecb_paes_crypt(req, CPACF_DECRYPT);
255}
256
257static struct skcipher_alg ecb_paes_alg = {
258 .base.cra_name = "ecb(paes)",
259 .base.cra_driver_name = "ecb-paes-s390",
260 .base.cra_priority = 401,
261 .base.cra_blocksize = AES_BLOCK_SIZE,
262 .base.cra_ctxsize = sizeof(struct s390_paes_ctx),
263 .base.cra_module = THIS_MODULE,
264 .base.cra_list = LIST_HEAD_INIT(ecb_paes_alg.base.cra_list),
265 .init = ecb_paes_init,
266 .exit = ecb_paes_exit,
267 .min_keysize = PAES_MIN_KEYSIZE,
268 .max_keysize = PAES_MAX_KEYSIZE,
269 .setkey = ecb_paes_set_key,
270 .encrypt = ecb_paes_encrypt,
271 .decrypt = ecb_paes_decrypt,
272};
273
274static int cbc_paes_init(struct crypto_skcipher *tfm)
275{
276 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
277
278 ctx->kb.key = NULL;
279 spin_lock_init(&ctx->pk_lock);
280
281 return 0;
282}
283
284static void cbc_paes_exit(struct crypto_skcipher *tfm)
285{
286 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
287
288 _free_kb_keybuf(&ctx->kb);
289}
290
291static inline int __cbc_paes_set_key(struct s390_paes_ctx *ctx)
292{
293 int rc;
294 unsigned long fc;
295
296 rc = __paes_convert_key(ctx);
297 if (rc)
298 return rc;
299
300
301 fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMC_PAES_128 :
302 (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KMC_PAES_192 :
303 (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? CPACF_KMC_PAES_256 : 0;
304
305
306 ctx->fc = (fc && cpacf_test_func(&kmc_functions, fc)) ? fc : 0;
307
308 return ctx->fc ? 0 : -EINVAL;
309}
310
311static int cbc_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
312 unsigned int key_len)
313{
314 int rc;
315 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
316
317 _free_kb_keybuf(&ctx->kb);
318 rc = _key_to_kb(&ctx->kb, in_key, key_len);
319 if (rc)
320 return rc;
321
322 return __cbc_paes_set_key(ctx);
323}
324
325static int cbc_paes_crypt(struct skcipher_request *req, unsigned long modifier)
326{
327 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
328 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
329 struct skcipher_walk walk;
330 unsigned int nbytes, n, k;
331 int ret;
332 struct {
333 u8 iv[AES_BLOCK_SIZE];
334 u8 key[MAXPROTKEYSIZE];
335 } param;
336
337 ret = skcipher_walk_virt(&walk, req, false);
338 if (ret)
339 return ret;
340
341 memcpy(param.iv, walk.iv, AES_BLOCK_SIZE);
342 spin_lock_bh(&ctx->pk_lock);
343 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
344 spin_unlock_bh(&ctx->pk_lock);
345
346 while ((nbytes = walk.nbytes) != 0) {
347
348 n = nbytes & ~(AES_BLOCK_SIZE - 1);
349 k = cpacf_kmc(ctx->fc | modifier, ¶m,
350 walk.dst.virt.addr, walk.src.virt.addr, n);
351 if (k) {
352 memcpy(walk.iv, param.iv, AES_BLOCK_SIZE);
353 ret = skcipher_walk_done(&walk, nbytes - k);
354 }
355 if (k < n) {
356 if (__paes_convert_key(ctx))
357 return skcipher_walk_done(&walk, -EIO);
358 spin_lock_bh(&ctx->pk_lock);
359 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
360 spin_unlock_bh(&ctx->pk_lock);
361 }
362 }
363 return ret;
364}
365
366static int cbc_paes_encrypt(struct skcipher_request *req)
367{
368 return cbc_paes_crypt(req, 0);
369}
370
371static int cbc_paes_decrypt(struct skcipher_request *req)
372{
373 return cbc_paes_crypt(req, CPACF_DECRYPT);
374}
375
376static struct skcipher_alg cbc_paes_alg = {
377 .base.cra_name = "cbc(paes)",
378 .base.cra_driver_name = "cbc-paes-s390",
379 .base.cra_priority = 402,
380 .base.cra_blocksize = AES_BLOCK_SIZE,
381 .base.cra_ctxsize = sizeof(struct s390_paes_ctx),
382 .base.cra_module = THIS_MODULE,
383 .base.cra_list = LIST_HEAD_INIT(cbc_paes_alg.base.cra_list),
384 .init = cbc_paes_init,
385 .exit = cbc_paes_exit,
386 .min_keysize = PAES_MIN_KEYSIZE,
387 .max_keysize = PAES_MAX_KEYSIZE,
388 .ivsize = AES_BLOCK_SIZE,
389 .setkey = cbc_paes_set_key,
390 .encrypt = cbc_paes_encrypt,
391 .decrypt = cbc_paes_decrypt,
392};
393
394static int xts_paes_init(struct crypto_skcipher *tfm)
395{
396 struct s390_pxts_ctx *ctx = crypto_skcipher_ctx(tfm);
397
398 ctx->kb[0].key = NULL;
399 ctx->kb[1].key = NULL;
400 spin_lock_init(&ctx->pk_lock);
401
402 return 0;
403}
404
405static void xts_paes_exit(struct crypto_skcipher *tfm)
406{
407 struct s390_pxts_ctx *ctx = crypto_skcipher_ctx(tfm);
408
409 _free_kb_keybuf(&ctx->kb[0]);
410 _free_kb_keybuf(&ctx->kb[1]);
411}
412
413static inline int __xts_paes_convert_key(struct s390_pxts_ctx *ctx)
414{
415 struct pkey_protkey pkey0, pkey1;
416
417 if (__paes_keyblob2pkey(&ctx->kb[0], &pkey0) ||
418 __paes_keyblob2pkey(&ctx->kb[1], &pkey1))
419 return -EINVAL;
420
421 spin_lock_bh(&ctx->pk_lock);
422 memcpy(&ctx->pk[0], &pkey0, sizeof(pkey0));
423 memcpy(&ctx->pk[1], &pkey1, sizeof(pkey1));
424 spin_unlock_bh(&ctx->pk_lock);
425
426 return 0;
427}
428
429static inline int __xts_paes_set_key(struct s390_pxts_ctx *ctx)
430{
431 unsigned long fc;
432
433 if (__xts_paes_convert_key(ctx))
434 return -EINVAL;
435
436 if (ctx->pk[0].type != ctx->pk[1].type)
437 return -EINVAL;
438
439
440 fc = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PXTS_128 :
441 (ctx->pk[0].type == PKEY_KEYTYPE_AES_256) ?
442 CPACF_KM_PXTS_256 : 0;
443
444
445 ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
446
447 return ctx->fc ? 0 : -EINVAL;
448}
449
450static int xts_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
451 unsigned int xts_key_len)
452{
453 int rc;
454 struct s390_pxts_ctx *ctx = crypto_skcipher_ctx(tfm);
455 u8 ckey[2 * AES_MAX_KEY_SIZE];
456 unsigned int ckey_len, key_len;
457
458 if (xts_key_len % 2)
459 return -EINVAL;
460
461 key_len = xts_key_len / 2;
462
463 _free_kb_keybuf(&ctx->kb[0]);
464 _free_kb_keybuf(&ctx->kb[1]);
465 rc = _key_to_kb(&ctx->kb[0], in_key, key_len);
466 if (rc)
467 return rc;
468 rc = _key_to_kb(&ctx->kb[1], in_key + key_len, key_len);
469 if (rc)
470 return rc;
471
472 rc = __xts_paes_set_key(ctx);
473 if (rc)
474 return rc;
475
476
477
478
479
480
481 ckey_len = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ?
482 AES_KEYSIZE_128 : AES_KEYSIZE_256;
483 memcpy(ckey, ctx->pk[0].protkey, ckey_len);
484 memcpy(ckey + ckey_len, ctx->pk[1].protkey, ckey_len);
485 return xts_verify_key(tfm, ckey, 2*ckey_len);
486}
487
488static int xts_paes_crypt(struct skcipher_request *req, unsigned long modifier)
489{
490 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
491 struct s390_pxts_ctx *ctx = crypto_skcipher_ctx(tfm);
492 struct skcipher_walk walk;
493 unsigned int keylen, offset, nbytes, n, k;
494 int ret;
495 struct {
496 u8 key[MAXPROTKEYSIZE];
497 u8 tweak[16];
498 u8 block[16];
499 u8 bit[16];
500 u8 xts[16];
501 } pcc_param;
502 struct {
503 u8 key[MAXPROTKEYSIZE];
504 u8 init[16];
505 } xts_param;
506
507 ret = skcipher_walk_virt(&walk, req, false);
508 if (ret)
509 return ret;
510
511 keylen = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? 48 : 64;
512 offset = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? 16 : 0;
513
514 memset(&pcc_param, 0, sizeof(pcc_param));
515 memcpy(pcc_param.tweak, walk.iv, sizeof(pcc_param.tweak));
516 spin_lock_bh(&ctx->pk_lock);
517 memcpy(pcc_param.key + offset, ctx->pk[1].protkey, keylen);
518 memcpy(xts_param.key + offset, ctx->pk[0].protkey, keylen);
519 spin_unlock_bh(&ctx->pk_lock);
520 cpacf_pcc(ctx->fc, pcc_param.key + offset);
521 memcpy(xts_param.init, pcc_param.xts, 16);
522
523 while ((nbytes = walk.nbytes) != 0) {
524
525 n = nbytes & ~(AES_BLOCK_SIZE - 1);
526 k = cpacf_km(ctx->fc | modifier, xts_param.key + offset,
527 walk.dst.virt.addr, walk.src.virt.addr, n);
528 if (k)
529 ret = skcipher_walk_done(&walk, nbytes - k);
530 if (k < n) {
531 if (__xts_paes_convert_key(ctx))
532 return skcipher_walk_done(&walk, -EIO);
533 spin_lock_bh(&ctx->pk_lock);
534 memcpy(xts_param.key + offset,
535 ctx->pk[0].protkey, keylen);
536 spin_unlock_bh(&ctx->pk_lock);
537 }
538 }
539
540 return ret;
541}
542
543static int xts_paes_encrypt(struct skcipher_request *req)
544{
545 return xts_paes_crypt(req, 0);
546}
547
548static int xts_paes_decrypt(struct skcipher_request *req)
549{
550 return xts_paes_crypt(req, CPACF_DECRYPT);
551}
552
553static struct skcipher_alg xts_paes_alg = {
554 .base.cra_name = "xts(paes)",
555 .base.cra_driver_name = "xts-paes-s390",
556 .base.cra_priority = 402,
557 .base.cra_blocksize = AES_BLOCK_SIZE,
558 .base.cra_ctxsize = sizeof(struct s390_pxts_ctx),
559 .base.cra_module = THIS_MODULE,
560 .base.cra_list = LIST_HEAD_INIT(xts_paes_alg.base.cra_list),
561 .init = xts_paes_init,
562 .exit = xts_paes_exit,
563 .min_keysize = 2 * PAES_MIN_KEYSIZE,
564 .max_keysize = 2 * PAES_MAX_KEYSIZE,
565 .ivsize = AES_BLOCK_SIZE,
566 .setkey = xts_paes_set_key,
567 .encrypt = xts_paes_encrypt,
568 .decrypt = xts_paes_decrypt,
569};
570
571static int ctr_paes_init(struct crypto_skcipher *tfm)
572{
573 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
574
575 ctx->kb.key = NULL;
576 spin_lock_init(&ctx->pk_lock);
577
578 return 0;
579}
580
581static void ctr_paes_exit(struct crypto_skcipher *tfm)
582{
583 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
584
585 _free_kb_keybuf(&ctx->kb);
586}
587
588static inline int __ctr_paes_set_key(struct s390_paes_ctx *ctx)
589{
590 int rc;
591 unsigned long fc;
592
593 rc = __paes_convert_key(ctx);
594 if (rc)
595 return rc;
596
597
598 fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMCTR_PAES_128 :
599 (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KMCTR_PAES_192 :
600 (ctx->pk.type == PKEY_KEYTYPE_AES_256) ?
601 CPACF_KMCTR_PAES_256 : 0;
602
603
604 ctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0;
605
606 return ctx->fc ? 0 : -EINVAL;
607}
608
609static int ctr_paes_set_key(struct crypto_skcipher *tfm, const u8 *in_key,
610 unsigned int key_len)
611{
612 int rc;
613 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
614
615 _free_kb_keybuf(&ctx->kb);
616 rc = _key_to_kb(&ctx->kb, in_key, key_len);
617 if (rc)
618 return rc;
619
620 return __ctr_paes_set_key(ctx);
621}
622
623static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
624{
625 unsigned int i, n;
626
627
628 memcpy(ctrptr, iv, AES_BLOCK_SIZE);
629 n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);
630 for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) {
631 memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE);
632 crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE);
633 ctrptr += AES_BLOCK_SIZE;
634 }
635 return n;
636}
637
638static int ctr_paes_crypt(struct skcipher_request *req)
639{
640 struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);
641 struct s390_paes_ctx *ctx = crypto_skcipher_ctx(tfm);
642 u8 buf[AES_BLOCK_SIZE], *ctrptr;
643 struct skcipher_walk walk;
644 unsigned int nbytes, n, k;
645 int ret, locked;
646 struct {
647 u8 key[MAXPROTKEYSIZE];
648 } param;
649
650 ret = skcipher_walk_virt(&walk, req, false);
651 if (ret)
652 return ret;
653
654 spin_lock_bh(&ctx->pk_lock);
655 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
656 spin_unlock_bh(&ctx->pk_lock);
657
658 locked = mutex_trylock(&ctrblk_lock);
659
660 while ((nbytes = walk.nbytes) >= AES_BLOCK_SIZE) {
661 n = AES_BLOCK_SIZE;
662 if (nbytes >= 2*AES_BLOCK_SIZE && locked)
663 n = __ctrblk_init(ctrblk, walk.iv, nbytes);
664 ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk.iv;
665 k = cpacf_kmctr(ctx->fc, ¶m, walk.dst.virt.addr,
666 walk.src.virt.addr, n, ctrptr);
667 if (k) {
668 if (ctrptr == ctrblk)
669 memcpy(walk.iv, ctrptr + k - AES_BLOCK_SIZE,
670 AES_BLOCK_SIZE);
671 crypto_inc(walk.iv, AES_BLOCK_SIZE);
672 ret = skcipher_walk_done(&walk, nbytes - k);
673 }
674 if (k < n) {
675 if (__paes_convert_key(ctx)) {
676 if (locked)
677 mutex_unlock(&ctrblk_lock);
678 return skcipher_walk_done(&walk, -EIO);
679 }
680 spin_lock_bh(&ctx->pk_lock);
681 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
682 spin_unlock_bh(&ctx->pk_lock);
683 }
684 }
685 if (locked)
686 mutex_unlock(&ctrblk_lock);
687
688
689
690 if (nbytes) {
691 while (1) {
692 if (cpacf_kmctr(ctx->fc, ¶m, buf,
693 walk.src.virt.addr, AES_BLOCK_SIZE,
694 walk.iv) == AES_BLOCK_SIZE)
695 break;
696 if (__paes_convert_key(ctx))
697 return skcipher_walk_done(&walk, -EIO);
698 spin_lock_bh(&ctx->pk_lock);
699 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
700 spin_unlock_bh(&ctx->pk_lock);
701 }
702 memcpy(walk.dst.virt.addr, buf, nbytes);
703 crypto_inc(walk.iv, AES_BLOCK_SIZE);
704 ret = skcipher_walk_done(&walk, nbytes);
705 }
706
707 return ret;
708}
709
710static struct skcipher_alg ctr_paes_alg = {
711 .base.cra_name = "ctr(paes)",
712 .base.cra_driver_name = "ctr-paes-s390",
713 .base.cra_priority = 402,
714 .base.cra_blocksize = 1,
715 .base.cra_ctxsize = sizeof(struct s390_paes_ctx),
716 .base.cra_module = THIS_MODULE,
717 .base.cra_list = LIST_HEAD_INIT(ctr_paes_alg.base.cra_list),
718 .init = ctr_paes_init,
719 .exit = ctr_paes_exit,
720 .min_keysize = PAES_MIN_KEYSIZE,
721 .max_keysize = PAES_MAX_KEYSIZE,
722 .ivsize = AES_BLOCK_SIZE,
723 .setkey = ctr_paes_set_key,
724 .encrypt = ctr_paes_crypt,
725 .decrypt = ctr_paes_crypt,
726 .chunksize = AES_BLOCK_SIZE,
727};
728
729static inline void __crypto_unregister_skcipher(struct skcipher_alg *alg)
730{
731 if (!list_empty(&alg->base.cra_list))
732 crypto_unregister_skcipher(alg);
733}
734
735static void paes_s390_fini(void)
736{
737 __crypto_unregister_skcipher(&ctr_paes_alg);
738 __crypto_unregister_skcipher(&xts_paes_alg);
739 __crypto_unregister_skcipher(&cbc_paes_alg);
740 __crypto_unregister_skcipher(&ecb_paes_alg);
741 if (ctrblk)
742 free_page((unsigned long) ctrblk);
743}
744
745static int __init paes_s390_init(void)
746{
747 int ret;
748
749
750 cpacf_query(CPACF_KM, &km_functions);
751 cpacf_query(CPACF_KMC, &kmc_functions);
752 cpacf_query(CPACF_KMCTR, &kmctr_functions);
753
754 if (cpacf_test_func(&km_functions, CPACF_KM_PAES_128) ||
755 cpacf_test_func(&km_functions, CPACF_KM_PAES_192) ||
756 cpacf_test_func(&km_functions, CPACF_KM_PAES_256)) {
757 ret = crypto_register_skcipher(&ecb_paes_alg);
758 if (ret)
759 goto out_err;
760 }
761
762 if (cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_128) ||
763 cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_192) ||
764 cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_256)) {
765 ret = crypto_register_skcipher(&cbc_paes_alg);
766 if (ret)
767 goto out_err;
768 }
769
770 if (cpacf_test_func(&km_functions, CPACF_KM_PXTS_128) ||
771 cpacf_test_func(&km_functions, CPACF_KM_PXTS_256)) {
772 ret = crypto_register_skcipher(&xts_paes_alg);
773 if (ret)
774 goto out_err;
775 }
776
777 if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_128) ||
778 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_192) ||
779 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_256)) {
780 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
781 if (!ctrblk) {
782 ret = -ENOMEM;
783 goto out_err;
784 }
785 ret = crypto_register_skcipher(&ctr_paes_alg);
786 if (ret)
787 goto out_err;
788 }
789
790 return 0;
791out_err:
792 paes_s390_fini();
793 return ret;
794}
795
796module_init(paes_s390_init);
797module_exit(paes_s390_fini);
798
799MODULE_ALIAS_CRYPTO("paes");
800
801MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm with protected keys");
802MODULE_LICENSE("GPL");
803
