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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/spinlock.h>
24#include <crypto/xts.h>
25#include <asm/cpacf.h>
26#include <asm/pkey.h>
27
28static u8 *ctrblk;
29static DEFINE_SPINLOCK(ctrblk_lock);
30
31static cpacf_mask_t km_functions, kmc_functions, kmctr_functions;
32
33struct s390_paes_ctx {
34 struct pkey_seckey sk;
35 struct pkey_protkey pk;
36 unsigned long fc;
37};
38
39struct s390_pxts_ctx {
40 struct pkey_seckey sk[2];
41 struct pkey_protkey pk[2];
42 unsigned long fc;
43};
44
45static inline int __paes_convert_key(struct pkey_seckey *sk,
46 struct pkey_protkey *pk)
47{
48 int i, ret;
49
50
51 for (i = 0; i < 3; i++) {
52 ret = pkey_skey2pkey(sk, pk);
53 if (ret == 0)
54 break;
55 }
56
57 return ret;
58}
59
60static int __paes_set_key(struct s390_paes_ctx *ctx)
61{
62 unsigned long fc;
63
64 if (__paes_convert_key(&ctx->sk, &ctx->pk))
65 return -EINVAL;
66
67
68 fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PAES_128 :
69 (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KM_PAES_192 :
70 (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? CPACF_KM_PAES_256 : 0;
71
72
73 ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
74
75 return ctx->fc ? 0 : -EINVAL;
76}
77
78static int ecb_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
79 unsigned int key_len)
80{
81 struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm);
82
83 if (key_len != SECKEYBLOBSIZE)
84 return -EINVAL;
85
86 memcpy(ctx->sk.seckey, in_key, SECKEYBLOBSIZE);
87 if (__paes_set_key(ctx)) {
88 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
89 return -EINVAL;
90 }
91 return 0;
92}
93
94static int ecb_paes_crypt(struct blkcipher_desc *desc,
95 unsigned long modifier,
96 struct blkcipher_walk *walk)
97{
98 struct s390_paes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
99 unsigned int nbytes, n, k;
100 int ret;
101
102 ret = blkcipher_walk_virt(desc, walk);
103 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
104
105 n = nbytes & ~(AES_BLOCK_SIZE - 1);
106 k = cpacf_km(ctx->fc | modifier, ctx->pk.protkey,
107 walk->dst.virt.addr, walk->src.virt.addr, n);
108 if (k)
109 ret = blkcipher_walk_done(desc, walk, nbytes - k);
110 if (k < n) {
111 if (__paes_set_key(ctx) != 0)
112 return blkcipher_walk_done(desc, walk, -EIO);
113 }
114 }
115 return ret;
116}
117
118static int ecb_paes_encrypt(struct blkcipher_desc *desc,
119 struct scatterlist *dst, struct scatterlist *src,
120 unsigned int nbytes)
121{
122 struct blkcipher_walk walk;
123
124 blkcipher_walk_init(&walk, dst, src, nbytes);
125 return ecb_paes_crypt(desc, CPACF_ENCRYPT, &walk);
126}
127
128static int ecb_paes_decrypt(struct blkcipher_desc *desc,
129 struct scatterlist *dst, struct scatterlist *src,
130 unsigned int nbytes)
131{
132 struct blkcipher_walk walk;
133
134 blkcipher_walk_init(&walk, dst, src, nbytes);
135 return ecb_paes_crypt(desc, CPACF_DECRYPT, &walk);
136}
137
138static struct crypto_alg ecb_paes_alg = {
139 .cra_name = "ecb(paes)",
140 .cra_driver_name = "ecb-paes-s390",
141 .cra_priority = 400,
142 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
143 .cra_blocksize = AES_BLOCK_SIZE,
144 .cra_ctxsize = sizeof(struct s390_paes_ctx),
145 .cra_type = &crypto_blkcipher_type,
146 .cra_module = THIS_MODULE,
147 .cra_list = LIST_HEAD_INIT(ecb_paes_alg.cra_list),
148 .cra_u = {
149 .blkcipher = {
150 .min_keysize = SECKEYBLOBSIZE,
151 .max_keysize = SECKEYBLOBSIZE,
152 .setkey = ecb_paes_set_key,
153 .encrypt = ecb_paes_encrypt,
154 .decrypt = ecb_paes_decrypt,
155 }
156 }
157};
158
159static int __cbc_paes_set_key(struct s390_paes_ctx *ctx)
160{
161 unsigned long fc;
162
163 if (__paes_convert_key(&ctx->sk, &ctx->pk))
164 return -EINVAL;
165
166
167 fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMC_PAES_128 :
168 (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KMC_PAES_192 :
169 (ctx->pk.type == PKEY_KEYTYPE_AES_256) ? CPACF_KMC_PAES_256 : 0;
170
171
172 ctx->fc = (fc && cpacf_test_func(&kmc_functions, fc)) ? fc : 0;
173
174 return ctx->fc ? 0 : -EINVAL;
175}
176
177static int cbc_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
178 unsigned int key_len)
179{
180 struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm);
181
182 memcpy(ctx->sk.seckey, in_key, SECKEYBLOBSIZE);
183 if (__cbc_paes_set_key(ctx)) {
184 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
185 return -EINVAL;
186 }
187 return 0;
188}
189
190static int cbc_paes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
191 struct blkcipher_walk *walk)
192{
193 struct s390_paes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
194 unsigned int nbytes, n, k;
195 int ret;
196 struct {
197 u8 iv[AES_BLOCK_SIZE];
198 u8 key[MAXPROTKEYSIZE];
199 } param;
200
201 ret = blkcipher_walk_virt(desc, walk);
202 memcpy(param.iv, walk->iv, AES_BLOCK_SIZE);
203 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
204 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
205
206 n = nbytes & ~(AES_BLOCK_SIZE - 1);
207 k = cpacf_kmc(ctx->fc | modifier, ¶m,
208 walk->dst.virt.addr, walk->src.virt.addr, n);
209 if (k)
210 ret = blkcipher_walk_done(desc, walk, nbytes - k);
211 if (n < k) {
212 if (__cbc_paes_set_key(ctx) != 0)
213 return blkcipher_walk_done(desc, walk, -EIO);
214 memcpy(param.key, ctx->pk.protkey, MAXPROTKEYSIZE);
215 }
216 }
217 memcpy(walk->iv, param.iv, AES_BLOCK_SIZE);
218 return ret;
219}
220
221static int cbc_paes_encrypt(struct blkcipher_desc *desc,
222 struct scatterlist *dst, struct scatterlist *src,
223 unsigned int nbytes)
224{
225 struct blkcipher_walk walk;
226
227 blkcipher_walk_init(&walk, dst, src, nbytes);
228 return cbc_paes_crypt(desc, 0, &walk);
229}
230
231static int cbc_paes_decrypt(struct blkcipher_desc *desc,
232 struct scatterlist *dst, struct scatterlist *src,
233 unsigned int nbytes)
234{
235 struct blkcipher_walk walk;
236
237 blkcipher_walk_init(&walk, dst, src, nbytes);
238 return cbc_paes_crypt(desc, CPACF_DECRYPT, &walk);
239}
240
241static struct crypto_alg cbc_paes_alg = {
242 .cra_name = "cbc(paes)",
243 .cra_driver_name = "cbc-paes-s390",
244 .cra_priority = 400,
245 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
246 .cra_blocksize = AES_BLOCK_SIZE,
247 .cra_ctxsize = sizeof(struct s390_paes_ctx),
248 .cra_type = &crypto_blkcipher_type,
249 .cra_module = THIS_MODULE,
250 .cra_list = LIST_HEAD_INIT(cbc_paes_alg.cra_list),
251 .cra_u = {
252 .blkcipher = {
253 .min_keysize = SECKEYBLOBSIZE,
254 .max_keysize = SECKEYBLOBSIZE,
255 .ivsize = AES_BLOCK_SIZE,
256 .setkey = cbc_paes_set_key,
257 .encrypt = cbc_paes_encrypt,
258 .decrypt = cbc_paes_decrypt,
259 }
260 }
261};
262
263static int __xts_paes_set_key(struct s390_pxts_ctx *ctx)
264{
265 unsigned long fc;
266
267 if (__paes_convert_key(&ctx->sk[0], &ctx->pk[0]) ||
268 __paes_convert_key(&ctx->sk[1], &ctx->pk[1]))
269 return -EINVAL;
270
271 if (ctx->pk[0].type != ctx->pk[1].type)
272 return -EINVAL;
273
274
275 fc = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? CPACF_KM_PXTS_128 :
276 (ctx->pk[0].type == PKEY_KEYTYPE_AES_256) ?
277 CPACF_KM_PXTS_256 : 0;
278
279
280 ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
281
282 return ctx->fc ? 0 : -EINVAL;
283}
284
285static int xts_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
286 unsigned int key_len)
287{
288 struct s390_pxts_ctx *ctx = crypto_tfm_ctx(tfm);
289 u8 ckey[2 * AES_MAX_KEY_SIZE];
290 unsigned int ckey_len;
291
292 memcpy(ctx->sk[0].seckey, in_key, SECKEYBLOBSIZE);
293 memcpy(ctx->sk[1].seckey, in_key + SECKEYBLOBSIZE, SECKEYBLOBSIZE);
294 if (__xts_paes_set_key(ctx)) {
295 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
296 return -EINVAL;
297 }
298
299
300
301
302
303
304 ckey_len = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ?
305 AES_KEYSIZE_128 : AES_KEYSIZE_256;
306 memcpy(ckey, ctx->pk[0].protkey, ckey_len);
307 memcpy(ckey + ckey_len, ctx->pk[1].protkey, ckey_len);
308 return xts_check_key(tfm, ckey, 2*ckey_len);
309}
310
311static int xts_paes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
312 struct blkcipher_walk *walk)
313{
314 struct s390_pxts_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
315 unsigned int keylen, offset, nbytes, n, k;
316 int ret;
317 struct {
318 u8 key[MAXPROTKEYSIZE];
319 u8 tweak[16];
320 u8 block[16];
321 u8 bit[16];
322 u8 xts[16];
323 } pcc_param;
324 struct {
325 u8 key[MAXPROTKEYSIZE];
326 u8 init[16];
327 } xts_param;
328
329 ret = blkcipher_walk_virt(desc, walk);
330 keylen = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? 48 : 64;
331 offset = (ctx->pk[0].type == PKEY_KEYTYPE_AES_128) ? 16 : 0;
332retry:
333 memset(&pcc_param, 0, sizeof(pcc_param));
334 memcpy(pcc_param.tweak, walk->iv, sizeof(pcc_param.tweak));
335 memcpy(pcc_param.key + offset, ctx->pk[1].protkey, keylen);
336 cpacf_pcc(ctx->fc, pcc_param.key + offset);
337
338 memcpy(xts_param.key + offset, ctx->pk[0].protkey, keylen);
339 memcpy(xts_param.init, pcc_param.xts, 16);
340
341 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
342
343 n = nbytes & ~(AES_BLOCK_SIZE - 1);
344 k = cpacf_km(ctx->fc | modifier, xts_param.key + offset,
345 walk->dst.virt.addr, walk->src.virt.addr, n);
346 if (k)
347 ret = blkcipher_walk_done(desc, walk, nbytes - k);
348 if (k < n) {
349 if (__xts_paes_set_key(ctx) != 0)
350 return blkcipher_walk_done(desc, walk, -EIO);
351 goto retry;
352 }
353 }
354 return ret;
355}
356
357static int xts_paes_encrypt(struct blkcipher_desc *desc,
358 struct scatterlist *dst, struct scatterlist *src,
359 unsigned int nbytes)
360{
361 struct blkcipher_walk walk;
362
363 blkcipher_walk_init(&walk, dst, src, nbytes);
364 return xts_paes_crypt(desc, 0, &walk);
365}
366
367static int xts_paes_decrypt(struct blkcipher_desc *desc,
368 struct scatterlist *dst, struct scatterlist *src,
369 unsigned int nbytes)
370{
371 struct blkcipher_walk walk;
372
373 blkcipher_walk_init(&walk, dst, src, nbytes);
374 return xts_paes_crypt(desc, CPACF_DECRYPT, &walk);
375}
376
377static struct crypto_alg xts_paes_alg = {
378 .cra_name = "xts(paes)",
379 .cra_driver_name = "xts-paes-s390",
380 .cra_priority = 400,
381 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
382 .cra_blocksize = AES_BLOCK_SIZE,
383 .cra_ctxsize = sizeof(struct s390_pxts_ctx),
384 .cra_type = &crypto_blkcipher_type,
385 .cra_module = THIS_MODULE,
386 .cra_list = LIST_HEAD_INIT(xts_paes_alg.cra_list),
387 .cra_u = {
388 .blkcipher = {
389 .min_keysize = 2 * SECKEYBLOBSIZE,
390 .max_keysize = 2 * SECKEYBLOBSIZE,
391 .ivsize = AES_BLOCK_SIZE,
392 .setkey = xts_paes_set_key,
393 .encrypt = xts_paes_encrypt,
394 .decrypt = xts_paes_decrypt,
395 }
396 }
397};
398
399static int __ctr_paes_set_key(struct s390_paes_ctx *ctx)
400{
401 unsigned long fc;
402
403 if (__paes_convert_key(&ctx->sk, &ctx->pk))
404 return -EINVAL;
405
406
407 fc = (ctx->pk.type == PKEY_KEYTYPE_AES_128) ? CPACF_KMCTR_PAES_128 :
408 (ctx->pk.type == PKEY_KEYTYPE_AES_192) ? CPACF_KMCTR_PAES_192 :
409 (ctx->pk.type == PKEY_KEYTYPE_AES_256) ?
410 CPACF_KMCTR_PAES_256 : 0;
411
412
413 ctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0;
414
415 return ctx->fc ? 0 : -EINVAL;
416}
417
418static int ctr_paes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
419 unsigned int key_len)
420{
421 struct s390_paes_ctx *ctx = crypto_tfm_ctx(tfm);
422
423 memcpy(ctx->sk.seckey, in_key, key_len);
424 if (__ctr_paes_set_key(ctx)) {
425 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
426 return -EINVAL;
427 }
428 return 0;
429}
430
431static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
432{
433 unsigned int i, n;
434
435
436 memcpy(ctrptr, iv, AES_BLOCK_SIZE);
437 n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);
438 for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) {
439 memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE);
440 crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE);
441 ctrptr += AES_BLOCK_SIZE;
442 }
443 return n;
444}
445
446static int ctr_paes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
447 struct blkcipher_walk *walk)
448{
449 struct s390_paes_ctx *ctx = crypto_blkcipher_ctx(desc->tfm);
450 u8 buf[AES_BLOCK_SIZE], *ctrptr;
451 unsigned int nbytes, n, k;
452 int ret, locked;
453
454 locked = spin_trylock(&ctrblk_lock);
455
456 ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
457 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
458 n = AES_BLOCK_SIZE;
459 if (nbytes >= 2*AES_BLOCK_SIZE && locked)
460 n = __ctrblk_init(ctrblk, walk->iv, nbytes);
461 ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk->iv;
462 k = cpacf_kmctr(ctx->fc | modifier, ctx->pk.protkey,
463 walk->dst.virt.addr, walk->src.virt.addr,
464 n, ctrptr);
465 if (k) {
466 if (ctrptr == ctrblk)
467 memcpy(walk->iv, ctrptr + k - AES_BLOCK_SIZE,
468 AES_BLOCK_SIZE);
469 crypto_inc(walk->iv, AES_BLOCK_SIZE);
470 ret = blkcipher_walk_done(desc, walk, nbytes - n);
471 }
472 if (k < n) {
473 if (__ctr_paes_set_key(ctx) != 0) {
474 if (locked)
475 spin_unlock(&ctrblk_lock);
476 return blkcipher_walk_done(desc, walk, -EIO);
477 }
478 }
479 }
480 if (locked)
481 spin_unlock(&ctrblk_lock);
482
483
484
485 if (nbytes) {
486 while (1) {
487 if (cpacf_kmctr(ctx->fc | modifier,
488 ctx->pk.protkey, buf,
489 walk->src.virt.addr, AES_BLOCK_SIZE,
490 walk->iv) == AES_BLOCK_SIZE)
491 break;
492 if (__ctr_paes_set_key(ctx) != 0)
493 return blkcipher_walk_done(desc, walk, -EIO);
494 }
495 memcpy(walk->dst.virt.addr, buf, nbytes);
496 crypto_inc(walk->iv, AES_BLOCK_SIZE);
497 ret = blkcipher_walk_done(desc, walk, 0);
498 }
499
500 return ret;
501}
502
503static int ctr_paes_encrypt(struct blkcipher_desc *desc,
504 struct scatterlist *dst, struct scatterlist *src,
505 unsigned int nbytes)
506{
507 struct blkcipher_walk walk;
508
509 blkcipher_walk_init(&walk, dst, src, nbytes);
510 return ctr_paes_crypt(desc, 0, &walk);
511}
512
513static int ctr_paes_decrypt(struct blkcipher_desc *desc,
514 struct scatterlist *dst, struct scatterlist *src,
515 unsigned int nbytes)
516{
517 struct blkcipher_walk walk;
518
519 blkcipher_walk_init(&walk, dst, src, nbytes);
520 return ctr_paes_crypt(desc, CPACF_DECRYPT, &walk);
521}
522
523static struct crypto_alg ctr_paes_alg = {
524 .cra_name = "ctr(paes)",
525 .cra_driver_name = "ctr-paes-s390",
526 .cra_priority = 400,
527 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER,
528 .cra_blocksize = 1,
529 .cra_ctxsize = sizeof(struct s390_paes_ctx),
530 .cra_type = &crypto_blkcipher_type,
531 .cra_module = THIS_MODULE,
532 .cra_list = LIST_HEAD_INIT(ctr_paes_alg.cra_list),
533 .cra_u = {
534 .blkcipher = {
535 .min_keysize = SECKEYBLOBSIZE,
536 .max_keysize = SECKEYBLOBSIZE,
537 .ivsize = AES_BLOCK_SIZE,
538 .setkey = ctr_paes_set_key,
539 .encrypt = ctr_paes_encrypt,
540 .decrypt = ctr_paes_decrypt,
541 }
542 }
543};
544
545static inline void __crypto_unregister_alg(struct crypto_alg *alg)
546{
547 if (!list_empty(&alg->cra_list))
548 crypto_unregister_alg(alg);
549}
550
551static void paes_s390_fini(void)
552{
553 if (ctrblk)
554 free_page((unsigned long) ctrblk);
555 __crypto_unregister_alg(&ctr_paes_alg);
556 __crypto_unregister_alg(&xts_paes_alg);
557 __crypto_unregister_alg(&cbc_paes_alg);
558 __crypto_unregister_alg(&ecb_paes_alg);
559}
560
561static int __init paes_s390_init(void)
562{
563 int ret;
564
565
566 cpacf_query(CPACF_KM, &km_functions);
567 cpacf_query(CPACF_KMC, &kmc_functions);
568 cpacf_query(CPACF_KMCTR, &kmctr_functions);
569
570 if (cpacf_test_func(&km_functions, CPACF_KM_PAES_128) ||
571 cpacf_test_func(&km_functions, CPACF_KM_PAES_192) ||
572 cpacf_test_func(&km_functions, CPACF_KM_PAES_256)) {
573 ret = crypto_register_alg(&ecb_paes_alg);
574 if (ret)
575 goto out_err;
576 }
577
578 if (cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_128) ||
579 cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_192) ||
580 cpacf_test_func(&kmc_functions, CPACF_KMC_PAES_256)) {
581 ret = crypto_register_alg(&cbc_paes_alg);
582 if (ret)
583 goto out_err;
584 }
585
586 if (cpacf_test_func(&km_functions, CPACF_KM_PXTS_128) ||
587 cpacf_test_func(&km_functions, CPACF_KM_PXTS_256)) {
588 ret = crypto_register_alg(&xts_paes_alg);
589 if (ret)
590 goto out_err;
591 }
592
593 if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_128) ||
594 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_192) ||
595 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_PAES_256)) {
596 ret = crypto_register_alg(&ctr_paes_alg);
597 if (ret)
598 goto out_err;
599 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
600 if (!ctrblk) {
601 ret = -ENOMEM;
602 goto out_err;
603 }
604 }
605
606 return 0;
607out_err:
608 paes_s390_fini();
609 return ret;
610}
611
612module_init(paes_s390_init);
613module_exit(paes_s390_fini);
614
615MODULE_ALIAS_CRYPTO("paes");
616
617MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm with protected keys");
618MODULE_LICENSE("GPL");
619
