This source file includes following definitions.
- setkey_fallback_cip
- aes_set_key
- crypto_aes_encrypt
- crypto_aes_decrypt
- fallback_init_cip
- fallback_exit_cip
- setkey_fallback_blk
- fallback_blk_dec
- fallback_blk_enc
- ecb_aes_set_key
- ecb_aes_crypt
- ecb_aes_encrypt
- ecb_aes_decrypt
- fallback_init_blk
- fallback_exit_blk
- cbc_aes_set_key
- cbc_aes_crypt
- cbc_aes_encrypt
- cbc_aes_decrypt
- xts_fallback_setkey
- xts_fallback_decrypt
- xts_fallback_encrypt
- xts_aes_set_key
- xts_aes_crypt
- xts_aes_encrypt
- xts_aes_decrypt
- xts_fallback_init
- xts_fallback_exit
- ctr_aes_set_key
- __ctrblk_init
- ctr_aes_crypt
- ctr_aes_encrypt
- ctr_aes_decrypt
- gcm_aes_setkey
- gcm_aes_setauthsize
- gcm_walk_start
- _gcm_sg_clamp_and_map
- _gcm_sg_unmap_and_advance
- gcm_in_walk_go
- gcm_out_walk_go
- gcm_in_walk_done
- gcm_out_walk_done
- gcm_aes_crypt
- gcm_aes_encrypt
- gcm_aes_decrypt
- aes_s390_register_alg
- aes_s390_fini
- aes_s390_init
1
2
3
4
5
6
7
8
9
10
11
12
13
14
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/skcipher.h>
25 #include <crypto/scatterwalk.h>
26 #include <linux/err.h>
27 #include <linux/module.h>
28 #include <linux/cpufeature.h>
29 #include <linux/init.h>
30 #include <linux/mutex.h>
31 #include <linux/fips.h>
32 #include <linux/string.h>
33 #include <crypto/xts.h>
34 #include <asm/cpacf.h>
35
36 static u8 *ctrblk;
37 static DEFINE_MUTEX(ctrblk_lock);
38
39 static cpacf_mask_t km_functions, kmc_functions, kmctr_functions,
40 kma_functions;
41
42 struct s390_aes_ctx {
43 u8 key[AES_MAX_KEY_SIZE];
44 int key_len;
45 unsigned long fc;
46 union {
47 struct crypto_sync_skcipher *blk;
48 struct crypto_cipher *cip;
49 } fallback;
50 };
51
52 struct s390_xts_ctx {
53 u8 key[32];
54 u8 pcc_key[32];
55 int key_len;
56 unsigned long fc;
57 struct crypto_sync_skcipher *fallback;
58 };
59
60 struct gcm_sg_walk {
61 struct scatter_walk walk;
62 unsigned int walk_bytes;
63 u8 *walk_ptr;
64 unsigned int walk_bytes_remain;
65 u8 buf[AES_BLOCK_SIZE];
66 unsigned int buf_bytes;
67 u8 *ptr;
68 unsigned int nbytes;
69 };
70
71 static int setkey_fallback_cip(struct crypto_tfm *tfm, const u8 *in_key,
72 unsigned int key_len)
73 {
74 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
75 int ret;
76
77 sctx->fallback.cip->base.crt_flags &= ~CRYPTO_TFM_REQ_MASK;
78 sctx->fallback.cip->base.crt_flags |= (tfm->crt_flags &
79 CRYPTO_TFM_REQ_MASK);
80
81 ret = crypto_cipher_setkey(sctx->fallback.cip, in_key, key_len);
82 if (ret) {
83 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
84 tfm->crt_flags |= (sctx->fallback.cip->base.crt_flags &
85 CRYPTO_TFM_RES_MASK);
86 }
87 return ret;
88 }
89
90 static int aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
91 unsigned int key_len)
92 {
93 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
94 unsigned long fc;
95
96
97 fc = (key_len == 16) ? CPACF_KM_AES_128 :
98 (key_len == 24) ? CPACF_KM_AES_192 :
99 (key_len == 32) ? CPACF_KM_AES_256 : 0;
100
101
102 sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
103 if (!sctx->fc)
104 return setkey_fallback_cip(tfm, in_key, key_len);
105
106 sctx->key_len = key_len;
107 memcpy(sctx->key, in_key, key_len);
108 return 0;
109 }
110
111 static void crypto_aes_encrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
112 {
113 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
114
115 if (unlikely(!sctx->fc)) {
116 crypto_cipher_encrypt_one(sctx->fallback.cip, out, in);
117 return;
118 }
119 cpacf_km(sctx->fc, &sctx->key, out, in, AES_BLOCK_SIZE);
120 }
121
122 static void crypto_aes_decrypt(struct crypto_tfm *tfm, u8 *out, const u8 *in)
123 {
124 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
125
126 if (unlikely(!sctx->fc)) {
127 crypto_cipher_decrypt_one(sctx->fallback.cip, out, in);
128 return;
129 }
130 cpacf_km(sctx->fc | CPACF_DECRYPT,
131 &sctx->key, out, in, AES_BLOCK_SIZE);
132 }
133
134 static int fallback_init_cip(struct crypto_tfm *tfm)
135 {
136 const char *name = tfm->__crt_alg->cra_name;
137 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
138
139 sctx->fallback.cip = crypto_alloc_cipher(name, 0,
140 CRYPTO_ALG_NEED_FALLBACK);
141
142 if (IS_ERR(sctx->fallback.cip)) {
143 pr_err("Allocating AES fallback algorithm %s failed\n",
144 name);
145 return PTR_ERR(sctx->fallback.cip);
146 }
147
148 return 0;
149 }
150
151 static void fallback_exit_cip(struct crypto_tfm *tfm)
152 {
153 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
154
155 crypto_free_cipher(sctx->fallback.cip);
156 sctx->fallback.cip = NULL;
157 }
158
159 static struct crypto_alg aes_alg = {
160 .cra_name = "aes",
161 .cra_driver_name = "aes-s390",
162 .cra_priority = 300,
163 .cra_flags = CRYPTO_ALG_TYPE_CIPHER |
164 CRYPTO_ALG_NEED_FALLBACK,
165 .cra_blocksize = AES_BLOCK_SIZE,
166 .cra_ctxsize = sizeof(struct s390_aes_ctx),
167 .cra_module = THIS_MODULE,
168 .cra_init = fallback_init_cip,
169 .cra_exit = fallback_exit_cip,
170 .cra_u = {
171 .cipher = {
172 .cia_min_keysize = AES_MIN_KEY_SIZE,
173 .cia_max_keysize = AES_MAX_KEY_SIZE,
174 .cia_setkey = aes_set_key,
175 .cia_encrypt = crypto_aes_encrypt,
176 .cia_decrypt = crypto_aes_decrypt,
177 }
178 }
179 };
180
181 static int setkey_fallback_blk(struct crypto_tfm *tfm, const u8 *key,
182 unsigned int len)
183 {
184 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
185 unsigned int ret;
186
187 crypto_sync_skcipher_clear_flags(sctx->fallback.blk,
188 CRYPTO_TFM_REQ_MASK);
189 crypto_sync_skcipher_set_flags(sctx->fallback.blk, tfm->crt_flags &
190 CRYPTO_TFM_REQ_MASK);
191
192 ret = crypto_sync_skcipher_setkey(sctx->fallback.blk, key, len);
193
194 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
195 tfm->crt_flags |= crypto_sync_skcipher_get_flags(sctx->fallback.blk) &
196 CRYPTO_TFM_RES_MASK;
197
198 return ret;
199 }
200
201 static int fallback_blk_dec(struct blkcipher_desc *desc,
202 struct scatterlist *dst, struct scatterlist *src,
203 unsigned int nbytes)
204 {
205 unsigned int ret;
206 struct crypto_blkcipher *tfm = desc->tfm;
207 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm);
208 SYNC_SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
209
210 skcipher_request_set_sync_tfm(req, sctx->fallback.blk);
211 skcipher_request_set_callback(req, desc->flags, NULL, NULL);
212 skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
213
214 ret = crypto_skcipher_decrypt(req);
215
216 skcipher_request_zero(req);
217 return ret;
218 }
219
220 static int fallback_blk_enc(struct blkcipher_desc *desc,
221 struct scatterlist *dst, struct scatterlist *src,
222 unsigned int nbytes)
223 {
224 unsigned int ret;
225 struct crypto_blkcipher *tfm = desc->tfm;
226 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(tfm);
227 SYNC_SKCIPHER_REQUEST_ON_STACK(req, sctx->fallback.blk);
228
229 skcipher_request_set_sync_tfm(req, sctx->fallback.blk);
230 skcipher_request_set_callback(req, desc->flags, NULL, NULL);
231 skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
232
233 ret = crypto_skcipher_encrypt(req);
234 return ret;
235 }
236
237 static int ecb_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
238 unsigned int key_len)
239 {
240 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
241 unsigned long fc;
242
243
244 fc = (key_len == 16) ? CPACF_KM_AES_128 :
245 (key_len == 24) ? CPACF_KM_AES_192 :
246 (key_len == 32) ? CPACF_KM_AES_256 : 0;
247
248
249 sctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
250 if (!sctx->fc)
251 return setkey_fallback_blk(tfm, in_key, key_len);
252
253 sctx->key_len = key_len;
254 memcpy(sctx->key, in_key, key_len);
255 return 0;
256 }
257
258 static int ecb_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
259 struct blkcipher_walk *walk)
260 {
261 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
262 unsigned int nbytes, n;
263 int ret;
264
265 ret = blkcipher_walk_virt(desc, walk);
266 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
267
268 n = nbytes & ~(AES_BLOCK_SIZE - 1);
269 cpacf_km(sctx->fc | modifier, sctx->key,
270 walk->dst.virt.addr, walk->src.virt.addr, n);
271 ret = blkcipher_walk_done(desc, walk, nbytes - n);
272 }
273
274 return ret;
275 }
276
277 static int ecb_aes_encrypt(struct blkcipher_desc *desc,
278 struct scatterlist *dst, struct scatterlist *src,
279 unsigned int nbytes)
280 {
281 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
282 struct blkcipher_walk walk;
283
284 if (unlikely(!sctx->fc))
285 return fallback_blk_enc(desc, dst, src, nbytes);
286
287 blkcipher_walk_init(&walk, dst, src, nbytes);
288 return ecb_aes_crypt(desc, 0, &walk);
289 }
290
291 static int ecb_aes_decrypt(struct blkcipher_desc *desc,
292 struct scatterlist *dst, struct scatterlist *src,
293 unsigned int nbytes)
294 {
295 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
296 struct blkcipher_walk walk;
297
298 if (unlikely(!sctx->fc))
299 return fallback_blk_dec(desc, dst, src, nbytes);
300
301 blkcipher_walk_init(&walk, dst, src, nbytes);
302 return ecb_aes_crypt(desc, CPACF_DECRYPT, &walk);
303 }
304
305 static int fallback_init_blk(struct crypto_tfm *tfm)
306 {
307 const char *name = tfm->__crt_alg->cra_name;
308 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
309
310 sctx->fallback.blk = crypto_alloc_sync_skcipher(name, 0,
311 CRYPTO_ALG_NEED_FALLBACK);
312
313 if (IS_ERR(sctx->fallback.blk)) {
314 pr_err("Allocating AES fallback algorithm %s failed\n",
315 name);
316 return PTR_ERR(sctx->fallback.blk);
317 }
318
319 return 0;
320 }
321
322 static void fallback_exit_blk(struct crypto_tfm *tfm)
323 {
324 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
325
326 crypto_free_sync_skcipher(sctx->fallback.blk);
327 }
328
329 static struct crypto_alg ecb_aes_alg = {
330 .cra_name = "ecb(aes)",
331 .cra_driver_name = "ecb-aes-s390",
332 .cra_priority = 401,
333 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
334 CRYPTO_ALG_NEED_FALLBACK,
335 .cra_blocksize = AES_BLOCK_SIZE,
336 .cra_ctxsize = sizeof(struct s390_aes_ctx),
337 .cra_type = &crypto_blkcipher_type,
338 .cra_module = THIS_MODULE,
339 .cra_init = fallback_init_blk,
340 .cra_exit = fallback_exit_blk,
341 .cra_u = {
342 .blkcipher = {
343 .min_keysize = AES_MIN_KEY_SIZE,
344 .max_keysize = AES_MAX_KEY_SIZE,
345 .setkey = ecb_aes_set_key,
346 .encrypt = ecb_aes_encrypt,
347 .decrypt = ecb_aes_decrypt,
348 }
349 }
350 };
351
352 static int cbc_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
353 unsigned int key_len)
354 {
355 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
356 unsigned long fc;
357
358
359 fc = (key_len == 16) ? CPACF_KMC_AES_128 :
360 (key_len == 24) ? CPACF_KMC_AES_192 :
361 (key_len == 32) ? CPACF_KMC_AES_256 : 0;
362
363
364 sctx->fc = (fc && cpacf_test_func(&kmc_functions, fc)) ? fc : 0;
365 if (!sctx->fc)
366 return setkey_fallback_blk(tfm, in_key, key_len);
367
368 sctx->key_len = key_len;
369 memcpy(sctx->key, in_key, key_len);
370 return 0;
371 }
372
373 static int cbc_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
374 struct blkcipher_walk *walk)
375 {
376 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
377 unsigned int nbytes, n;
378 int ret;
379 struct {
380 u8 iv[AES_BLOCK_SIZE];
381 u8 key[AES_MAX_KEY_SIZE];
382 } param;
383
384 ret = blkcipher_walk_virt(desc, walk);
385 memcpy(param.iv, walk->iv, AES_BLOCK_SIZE);
386 memcpy(param.key, sctx->key, sctx->key_len);
387 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
388
389 n = nbytes & ~(AES_BLOCK_SIZE - 1);
390 cpacf_kmc(sctx->fc | modifier, ¶m,
391 walk->dst.virt.addr, walk->src.virt.addr, n);
392 ret = blkcipher_walk_done(desc, walk, nbytes - n);
393 }
394 memcpy(walk->iv, param.iv, AES_BLOCK_SIZE);
395 return ret;
396 }
397
398 static int cbc_aes_encrypt(struct blkcipher_desc *desc,
399 struct scatterlist *dst, struct scatterlist *src,
400 unsigned int nbytes)
401 {
402 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
403 struct blkcipher_walk walk;
404
405 if (unlikely(!sctx->fc))
406 return fallback_blk_enc(desc, dst, src, nbytes);
407
408 blkcipher_walk_init(&walk, dst, src, nbytes);
409 return cbc_aes_crypt(desc, 0, &walk);
410 }
411
412 static int cbc_aes_decrypt(struct blkcipher_desc *desc,
413 struct scatterlist *dst, struct scatterlist *src,
414 unsigned int nbytes)
415 {
416 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
417 struct blkcipher_walk walk;
418
419 if (unlikely(!sctx->fc))
420 return fallback_blk_dec(desc, dst, src, nbytes);
421
422 blkcipher_walk_init(&walk, dst, src, nbytes);
423 return cbc_aes_crypt(desc, CPACF_DECRYPT, &walk);
424 }
425
426 static struct crypto_alg cbc_aes_alg = {
427 .cra_name = "cbc(aes)",
428 .cra_driver_name = "cbc-aes-s390",
429 .cra_priority = 402,
430 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
431 CRYPTO_ALG_NEED_FALLBACK,
432 .cra_blocksize = AES_BLOCK_SIZE,
433 .cra_ctxsize = sizeof(struct s390_aes_ctx),
434 .cra_type = &crypto_blkcipher_type,
435 .cra_module = THIS_MODULE,
436 .cra_init = fallback_init_blk,
437 .cra_exit = fallback_exit_blk,
438 .cra_u = {
439 .blkcipher = {
440 .min_keysize = AES_MIN_KEY_SIZE,
441 .max_keysize = AES_MAX_KEY_SIZE,
442 .ivsize = AES_BLOCK_SIZE,
443 .setkey = cbc_aes_set_key,
444 .encrypt = cbc_aes_encrypt,
445 .decrypt = cbc_aes_decrypt,
446 }
447 }
448 };
449
450 static int xts_fallback_setkey(struct crypto_tfm *tfm, const u8 *key,
451 unsigned int len)
452 {
453 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
454 unsigned int ret;
455
456 crypto_sync_skcipher_clear_flags(xts_ctx->fallback,
457 CRYPTO_TFM_REQ_MASK);
458 crypto_sync_skcipher_set_flags(xts_ctx->fallback, tfm->crt_flags &
459 CRYPTO_TFM_REQ_MASK);
460
461 ret = crypto_sync_skcipher_setkey(xts_ctx->fallback, key, len);
462
463 tfm->crt_flags &= ~CRYPTO_TFM_RES_MASK;
464 tfm->crt_flags |= crypto_sync_skcipher_get_flags(xts_ctx->fallback) &
465 CRYPTO_TFM_RES_MASK;
466
467 return ret;
468 }
469
470 static int xts_fallback_decrypt(struct blkcipher_desc *desc,
471 struct scatterlist *dst, struct scatterlist *src,
472 unsigned int nbytes)
473 {
474 struct crypto_blkcipher *tfm = desc->tfm;
475 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm);
476 SYNC_SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
477 unsigned int ret;
478
479 skcipher_request_set_sync_tfm(req, xts_ctx->fallback);
480 skcipher_request_set_callback(req, desc->flags, NULL, NULL);
481 skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
482
483 ret = crypto_skcipher_decrypt(req);
484
485 skcipher_request_zero(req);
486 return ret;
487 }
488
489 static int xts_fallback_encrypt(struct blkcipher_desc *desc,
490 struct scatterlist *dst, struct scatterlist *src,
491 unsigned int nbytes)
492 {
493 struct crypto_blkcipher *tfm = desc->tfm;
494 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(tfm);
495 SYNC_SKCIPHER_REQUEST_ON_STACK(req, xts_ctx->fallback);
496 unsigned int ret;
497
498 skcipher_request_set_sync_tfm(req, xts_ctx->fallback);
499 skcipher_request_set_callback(req, desc->flags, NULL, NULL);
500 skcipher_request_set_crypt(req, src, dst, nbytes, desc->info);
501
502 ret = crypto_skcipher_encrypt(req);
503
504 skcipher_request_zero(req);
505 return ret;
506 }
507
508 static int xts_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
509 unsigned int key_len)
510 {
511 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
512 unsigned long fc;
513 int err;
514
515 err = xts_fallback_setkey(tfm, in_key, key_len);
516 if (err)
517 return err;
518
519
520 if (fips_enabled && key_len != 32 && key_len != 64) {
521 tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
522 return -EINVAL;
523 }
524
525
526 fc = (key_len == 32) ? CPACF_KM_XTS_128 :
527 (key_len == 64) ? CPACF_KM_XTS_256 : 0;
528
529
530 xts_ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
531 if (!xts_ctx->fc)
532 return 0;
533
534
535 key_len = key_len / 2;
536 xts_ctx->key_len = key_len;
537 memcpy(xts_ctx->key, in_key, key_len);
538 memcpy(xts_ctx->pcc_key, in_key + key_len, key_len);
539 return 0;
540 }
541
542 static int xts_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
543 struct blkcipher_walk *walk)
544 {
545 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
546 unsigned int offset, nbytes, n;
547 int ret;
548 struct {
549 u8 key[32];
550 u8 tweak[16];
551 u8 block[16];
552 u8 bit[16];
553 u8 xts[16];
554 } pcc_param;
555 struct {
556 u8 key[32];
557 u8 init[16];
558 } xts_param;
559
560 ret = blkcipher_walk_virt(desc, walk);
561 offset = xts_ctx->key_len & 0x10;
562 memset(pcc_param.block, 0, sizeof(pcc_param.block));
563 memset(pcc_param.bit, 0, sizeof(pcc_param.bit));
564 memset(pcc_param.xts, 0, sizeof(pcc_param.xts));
565 memcpy(pcc_param.tweak, walk->iv, sizeof(pcc_param.tweak));
566 memcpy(pcc_param.key + offset, xts_ctx->pcc_key, xts_ctx->key_len);
567 cpacf_pcc(xts_ctx->fc, pcc_param.key + offset);
568
569 memcpy(xts_param.key + offset, xts_ctx->key, xts_ctx->key_len);
570 memcpy(xts_param.init, pcc_param.xts, 16);
571
572 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
573
574 n = nbytes & ~(AES_BLOCK_SIZE - 1);
575 cpacf_km(xts_ctx->fc | modifier, xts_param.key + offset,
576 walk->dst.virt.addr, walk->src.virt.addr, n);
577 ret = blkcipher_walk_done(desc, walk, nbytes - n);
578 }
579 return ret;
580 }
581
582 static int xts_aes_encrypt(struct blkcipher_desc *desc,
583 struct scatterlist *dst, struct scatterlist *src,
584 unsigned int nbytes)
585 {
586 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
587 struct blkcipher_walk walk;
588
589 if (!nbytes)
590 return -EINVAL;
591
592 if (unlikely(!xts_ctx->fc || (nbytes % XTS_BLOCK_SIZE) != 0))
593 return xts_fallback_encrypt(desc, dst, src, nbytes);
594
595 blkcipher_walk_init(&walk, dst, src, nbytes);
596 return xts_aes_crypt(desc, 0, &walk);
597 }
598
599 static int xts_aes_decrypt(struct blkcipher_desc *desc,
600 struct scatterlist *dst, struct scatterlist *src,
601 unsigned int nbytes)
602 {
603 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
604 struct blkcipher_walk walk;
605
606 if (!nbytes)
607 return -EINVAL;
608
609 if (unlikely(!xts_ctx->fc || (nbytes % XTS_BLOCK_SIZE) != 0))
610 return xts_fallback_decrypt(desc, dst, src, nbytes);
611
612 blkcipher_walk_init(&walk, dst, src, nbytes);
613 return xts_aes_crypt(desc, CPACF_DECRYPT, &walk);
614 }
615
616 static int xts_fallback_init(struct crypto_tfm *tfm)
617 {
618 const char *name = tfm->__crt_alg->cra_name;
619 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
620
621 xts_ctx->fallback = crypto_alloc_sync_skcipher(name, 0,
622 CRYPTO_ALG_NEED_FALLBACK);
623
624 if (IS_ERR(xts_ctx->fallback)) {
625 pr_err("Allocating XTS fallback algorithm %s failed\n",
626 name);
627 return PTR_ERR(xts_ctx->fallback);
628 }
629 return 0;
630 }
631
632 static void xts_fallback_exit(struct crypto_tfm *tfm)
633 {
634 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
635
636 crypto_free_sync_skcipher(xts_ctx->fallback);
637 }
638
639 static struct crypto_alg xts_aes_alg = {
640 .cra_name = "xts(aes)",
641 .cra_driver_name = "xts-aes-s390",
642 .cra_priority = 402,
643 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
644 CRYPTO_ALG_NEED_FALLBACK,
645 .cra_blocksize = AES_BLOCK_SIZE,
646 .cra_ctxsize = sizeof(struct s390_xts_ctx),
647 .cra_type = &crypto_blkcipher_type,
648 .cra_module = THIS_MODULE,
649 .cra_init = xts_fallback_init,
650 .cra_exit = xts_fallback_exit,
651 .cra_u = {
652 .blkcipher = {
653 .min_keysize = 2 * AES_MIN_KEY_SIZE,
654 .max_keysize = 2 * AES_MAX_KEY_SIZE,
655 .ivsize = AES_BLOCK_SIZE,
656 .setkey = xts_aes_set_key,
657 .encrypt = xts_aes_encrypt,
658 .decrypt = xts_aes_decrypt,
659 }
660 }
661 };
662
663 static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
664 unsigned int key_len)
665 {
666 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
667 unsigned long fc;
668
669
670 fc = (key_len == 16) ? CPACF_KMCTR_AES_128 :
671 (key_len == 24) ? CPACF_KMCTR_AES_192 :
672 (key_len == 32) ? CPACF_KMCTR_AES_256 : 0;
673
674
675 sctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0;
676 if (!sctx->fc)
677 return setkey_fallback_blk(tfm, in_key, key_len);
678
679 sctx->key_len = key_len;
680 memcpy(sctx->key, in_key, key_len);
681 return 0;
682 }
683
684 static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
685 {
686 unsigned int i, n;
687
688
689 memcpy(ctrptr, iv, AES_BLOCK_SIZE);
690 n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);
691 for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) {
692 memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE);
693 crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE);
694 ctrptr += AES_BLOCK_SIZE;
695 }
696 return n;
697 }
698
699 static int ctr_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
700 struct blkcipher_walk *walk)
701 {
702 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
703 u8 buf[AES_BLOCK_SIZE], *ctrptr;
704 unsigned int n, nbytes;
705 int ret, locked;
706
707 locked = mutex_trylock(&ctrblk_lock);
708
709 ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
710 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
711 n = AES_BLOCK_SIZE;
712 if (nbytes >= 2*AES_BLOCK_SIZE && locked)
713 n = __ctrblk_init(ctrblk, walk->iv, nbytes);
714 ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk->iv;
715 cpacf_kmctr(sctx->fc | modifier, sctx->key,
716 walk->dst.virt.addr, walk->src.virt.addr,
717 n, ctrptr);
718 if (ctrptr == ctrblk)
719 memcpy(walk->iv, ctrptr + n - AES_BLOCK_SIZE,
720 AES_BLOCK_SIZE);
721 crypto_inc(walk->iv, AES_BLOCK_SIZE);
722 ret = blkcipher_walk_done(desc, walk, nbytes - n);
723 }
724 if (locked)
725 mutex_unlock(&ctrblk_lock);
726
727
728
729 if (nbytes) {
730 cpacf_kmctr(sctx->fc | modifier, sctx->key,
731 buf, walk->src.virt.addr,
732 AES_BLOCK_SIZE, walk->iv);
733 memcpy(walk->dst.virt.addr, buf, nbytes);
734 crypto_inc(walk->iv, AES_BLOCK_SIZE);
735 ret = blkcipher_walk_done(desc, walk, 0);
736 }
737
738 return ret;
739 }
740
741 static int ctr_aes_encrypt(struct blkcipher_desc *desc,
742 struct scatterlist *dst, struct scatterlist *src,
743 unsigned int nbytes)
744 {
745 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
746 struct blkcipher_walk walk;
747
748 if (unlikely(!sctx->fc))
749 return fallback_blk_enc(desc, dst, src, nbytes);
750
751 blkcipher_walk_init(&walk, dst, src, nbytes);
752 return ctr_aes_crypt(desc, 0, &walk);
753 }
754
755 static int ctr_aes_decrypt(struct blkcipher_desc *desc,
756 struct scatterlist *dst, struct scatterlist *src,
757 unsigned int nbytes)
758 {
759 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
760 struct blkcipher_walk walk;
761
762 if (unlikely(!sctx->fc))
763 return fallback_blk_dec(desc, dst, src, nbytes);
764
765 blkcipher_walk_init(&walk, dst, src, nbytes);
766 return ctr_aes_crypt(desc, CPACF_DECRYPT, &walk);
767 }
768
769 static struct crypto_alg ctr_aes_alg = {
770 .cra_name = "ctr(aes)",
771 .cra_driver_name = "ctr-aes-s390",
772 .cra_priority = 402,
773 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
774 CRYPTO_ALG_NEED_FALLBACK,
775 .cra_blocksize = 1,
776 .cra_ctxsize = sizeof(struct s390_aes_ctx),
777 .cra_type = &crypto_blkcipher_type,
778 .cra_module = THIS_MODULE,
779 .cra_init = fallback_init_blk,
780 .cra_exit = fallback_exit_blk,
781 .cra_u = {
782 .blkcipher = {
783 .min_keysize = AES_MIN_KEY_SIZE,
784 .max_keysize = AES_MAX_KEY_SIZE,
785 .ivsize = AES_BLOCK_SIZE,
786 .setkey = ctr_aes_set_key,
787 .encrypt = ctr_aes_encrypt,
788 .decrypt = ctr_aes_decrypt,
789 }
790 }
791 };
792
793 static int gcm_aes_setkey(struct crypto_aead *tfm, const u8 *key,
794 unsigned int keylen)
795 {
796 struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
797
798 switch (keylen) {
799 case AES_KEYSIZE_128:
800 ctx->fc = CPACF_KMA_GCM_AES_128;
801 break;
802 case AES_KEYSIZE_192:
803 ctx->fc = CPACF_KMA_GCM_AES_192;
804 break;
805 case AES_KEYSIZE_256:
806 ctx->fc = CPACF_KMA_GCM_AES_256;
807 break;
808 default:
809 return -EINVAL;
810 }
811
812 memcpy(ctx->key, key, keylen);
813 ctx->key_len = keylen;
814 return 0;
815 }
816
817 static int gcm_aes_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
818 {
819 switch (authsize) {
820 case 4:
821 case 8:
822 case 12:
823 case 13:
824 case 14:
825 case 15:
826 case 16:
827 break;
828 default:
829 return -EINVAL;
830 }
831
832 return 0;
833 }
834
835 static void gcm_walk_start(struct gcm_sg_walk *gw, struct scatterlist *sg,
836 unsigned int len)
837 {
838 memset(gw, 0, sizeof(*gw));
839 gw->walk_bytes_remain = len;
840 scatterwalk_start(&gw->walk, sg);
841 }
842
843 static inline unsigned int _gcm_sg_clamp_and_map(struct gcm_sg_walk *gw)
844 {
845 struct scatterlist *nextsg;
846
847 gw->walk_bytes = scatterwalk_clamp(&gw->walk, gw->walk_bytes_remain);
848 while (!gw->walk_bytes) {
849 nextsg = sg_next(gw->walk.sg);
850 if (!nextsg)
851 return 0;
852 scatterwalk_start(&gw->walk, nextsg);
853 gw->walk_bytes = scatterwalk_clamp(&gw->walk,
854 gw->walk_bytes_remain);
855 }
856 gw->walk_ptr = scatterwalk_map(&gw->walk);
857 return gw->walk_bytes;
858 }
859
860 static inline void _gcm_sg_unmap_and_advance(struct gcm_sg_walk *gw,
861 unsigned int nbytes)
862 {
863 gw->walk_bytes_remain -= nbytes;
864 scatterwalk_unmap(&gw->walk);
865 scatterwalk_advance(&gw->walk, nbytes);
866 scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
867 gw->walk_ptr = NULL;
868 }
869
870 static int gcm_in_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
871 {
872 int n;
873
874 if (gw->buf_bytes && gw->buf_bytes >= minbytesneeded) {
875 gw->ptr = gw->buf;
876 gw->nbytes = gw->buf_bytes;
877 goto out;
878 }
879
880 if (gw->walk_bytes_remain == 0) {
881 gw->ptr = NULL;
882 gw->nbytes = 0;
883 goto out;
884 }
885
886 if (!_gcm_sg_clamp_and_map(gw)) {
887 gw->ptr = NULL;
888 gw->nbytes = 0;
889 goto out;
890 }
891
892 if (!gw->buf_bytes && gw->walk_bytes >= minbytesneeded) {
893 gw->ptr = gw->walk_ptr;
894 gw->nbytes = gw->walk_bytes;
895 goto out;
896 }
897
898 while (1) {
899 n = min(gw->walk_bytes, AES_BLOCK_SIZE - gw->buf_bytes);
900 memcpy(gw->buf + gw->buf_bytes, gw->walk_ptr, n);
901 gw->buf_bytes += n;
902 _gcm_sg_unmap_and_advance(gw, n);
903 if (gw->buf_bytes >= minbytesneeded) {
904 gw->ptr = gw->buf;
905 gw->nbytes = gw->buf_bytes;
906 goto out;
907 }
908 if (!_gcm_sg_clamp_and_map(gw)) {
909 gw->ptr = NULL;
910 gw->nbytes = 0;
911 goto out;
912 }
913 }
914
915 out:
916 return gw->nbytes;
917 }
918
919 static int gcm_out_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
920 {
921 if (gw->walk_bytes_remain == 0) {
922 gw->ptr = NULL;
923 gw->nbytes = 0;
924 goto out;
925 }
926
927 if (!_gcm_sg_clamp_and_map(gw)) {
928 gw->ptr = NULL;
929 gw->nbytes = 0;
930 goto out;
931 }
932
933 if (gw->walk_bytes >= minbytesneeded) {
934 gw->ptr = gw->walk_ptr;
935 gw->nbytes = gw->walk_bytes;
936 goto out;
937 }
938
939 scatterwalk_unmap(&gw->walk);
940 gw->walk_ptr = NULL;
941
942 gw->ptr = gw->buf;
943 gw->nbytes = sizeof(gw->buf);
944
945 out:
946 return gw->nbytes;
947 }
948
949 static int gcm_in_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
950 {
951 if (gw->ptr == NULL)
952 return 0;
953
954 if (gw->ptr == gw->buf) {
955 int n = gw->buf_bytes - bytesdone;
956 if (n > 0) {
957 memmove(gw->buf, gw->buf + bytesdone, n);
958 gw->buf_bytes = n;
959 } else
960 gw->buf_bytes = 0;
961 } else
962 _gcm_sg_unmap_and_advance(gw, bytesdone);
963
964 return bytesdone;
965 }
966
967 static int gcm_out_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
968 {
969 int i, n;
970
971 if (gw->ptr == NULL)
972 return 0;
973
974 if (gw->ptr == gw->buf) {
975 for (i = 0; i < bytesdone; i += n) {
976 if (!_gcm_sg_clamp_and_map(gw))
977 return i;
978 n = min(gw->walk_bytes, bytesdone - i);
979 memcpy(gw->walk_ptr, gw->buf + i, n);
980 _gcm_sg_unmap_and_advance(gw, n);
981 }
982 } else
983 _gcm_sg_unmap_and_advance(gw, bytesdone);
984
985 return bytesdone;
986 }
987
988 static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
989 {
990 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
991 struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
992 unsigned int ivsize = crypto_aead_ivsize(tfm);
993 unsigned int taglen = crypto_aead_authsize(tfm);
994 unsigned int aadlen = req->assoclen;
995 unsigned int pclen = req->cryptlen;
996 int ret = 0;
997
998 unsigned int n, len, in_bytes, out_bytes,
999 min_bytes, bytes, aad_bytes, pc_bytes;
1000 struct gcm_sg_walk gw_in, gw_out;
1001 u8 tag[GHASH_DIGEST_SIZE];
1002
1003 struct {
1004 u32 _[3];
1005 u32 cv;
1006 u8 t[GHASH_DIGEST_SIZE];
1007 u8 h[AES_BLOCK_SIZE];
1008 u64 taadl;
1009 u64 tpcl;
1010 u8 j0[GHASH_BLOCK_SIZE];
1011 u8 k[AES_MAX_KEY_SIZE];
1012 } param;
1013
1014
1015
1016
1017
1018
1019
1020
1021
1022
1023 if (flags & CPACF_DECRYPT)
1024 pclen -= taglen;
1025 len = aadlen + pclen;
1026
1027 memset(¶m, 0, sizeof(param));
1028 param.cv = 1;
1029 param.taadl = aadlen * 8;
1030 param.tpcl = pclen * 8;
1031 memcpy(param.j0, req->iv, ivsize);
1032 *(u32 *)(param.j0 + ivsize) = 1;
1033 memcpy(param.k, ctx->key, ctx->key_len);
1034
1035 gcm_walk_start(&gw_in, req->src, len);
1036 gcm_walk_start(&gw_out, req->dst, len);
1037
1038 do {
1039 min_bytes = min_t(unsigned int,
1040 aadlen > 0 ? aadlen : pclen, AES_BLOCK_SIZE);
1041 in_bytes = gcm_in_walk_go(&gw_in, min_bytes);
1042 out_bytes = gcm_out_walk_go(&gw_out, min_bytes);
1043 bytes = min(in_bytes, out_bytes);
1044
1045 if (aadlen + pclen <= bytes) {
1046 aad_bytes = aadlen;
1047 pc_bytes = pclen;
1048 flags |= CPACF_KMA_LAAD | CPACF_KMA_LPC;
1049 } else {
1050 if (aadlen <= bytes) {
1051 aad_bytes = aadlen;
1052 pc_bytes = (bytes - aadlen) &
1053 ~(AES_BLOCK_SIZE - 1);
1054 flags |= CPACF_KMA_LAAD;
1055 } else {
1056 aad_bytes = bytes & ~(AES_BLOCK_SIZE - 1);
1057 pc_bytes = 0;
1058 }
1059 }
1060
1061 if (aad_bytes > 0)
1062 memcpy(gw_out.ptr, gw_in.ptr, aad_bytes);
1063
1064 cpacf_kma(ctx->fc | flags, ¶m,
1065 gw_out.ptr + aad_bytes,
1066 gw_in.ptr + aad_bytes, pc_bytes,
1067 gw_in.ptr, aad_bytes);
1068
1069 n = aad_bytes + pc_bytes;
1070 if (gcm_in_walk_done(&gw_in, n) != n)
1071 return -ENOMEM;
1072 if (gcm_out_walk_done(&gw_out, n) != n)
1073 return -ENOMEM;
1074 aadlen -= aad_bytes;
1075 pclen -= pc_bytes;
1076 } while (aadlen + pclen > 0);
1077
1078 if (flags & CPACF_DECRYPT) {
1079 scatterwalk_map_and_copy(tag, req->src, len, taglen, 0);
1080 if (crypto_memneq(tag, param.t, taglen))
1081 ret = -EBADMSG;
1082 } else
1083 scatterwalk_map_and_copy(param.t, req->dst, len, taglen, 1);
1084
1085 memzero_explicit(¶m, sizeof(param));
1086 return ret;
1087 }
1088
1089 static int gcm_aes_encrypt(struct aead_request *req)
1090 {
1091 return gcm_aes_crypt(req, CPACF_ENCRYPT);
1092 }
1093
1094 static int gcm_aes_decrypt(struct aead_request *req)
1095 {
1096 return gcm_aes_crypt(req, CPACF_DECRYPT);
1097 }
1098
1099 static struct aead_alg gcm_aes_aead = {
1100 .setkey = gcm_aes_setkey,
1101 .setauthsize = gcm_aes_setauthsize,
1102 .encrypt = gcm_aes_encrypt,
1103 .decrypt = gcm_aes_decrypt,
1104
1105 .ivsize = GHASH_BLOCK_SIZE - sizeof(u32),
1106 .maxauthsize = GHASH_DIGEST_SIZE,
1107 .chunksize = AES_BLOCK_SIZE,
1108
1109 .base = {
1110 .cra_blocksize = 1,
1111 .cra_ctxsize = sizeof(struct s390_aes_ctx),
1112 .cra_priority = 900,
1113 .cra_name = "gcm(aes)",
1114 .cra_driver_name = "gcm-aes-s390",
1115 .cra_module = THIS_MODULE,
1116 },
1117 };
1118
1119 static struct crypto_alg *aes_s390_algs_ptr[5];
1120 static int aes_s390_algs_num;
1121 static struct aead_alg *aes_s390_aead_alg;
1122
1123 static int aes_s390_register_alg(struct crypto_alg *alg)
1124 {
1125 int ret;
1126
1127 ret = crypto_register_alg(alg);
1128 if (!ret)
1129 aes_s390_algs_ptr[aes_s390_algs_num++] = alg;
1130 return ret;
1131 }
1132
1133 static void aes_s390_fini(void)
1134 {
1135 while (aes_s390_algs_num--)
1136 crypto_unregister_alg(aes_s390_algs_ptr[aes_s390_algs_num]);
1137 if (ctrblk)
1138 free_page((unsigned long) ctrblk);
1139
1140 if (aes_s390_aead_alg)
1141 crypto_unregister_aead(aes_s390_aead_alg);
1142 }
1143
1144 static int __init aes_s390_init(void)
1145 {
1146 int ret;
1147
1148
1149 cpacf_query(CPACF_KM, &km_functions);
1150 cpacf_query(CPACF_KMC, &kmc_functions);
1151 cpacf_query(CPACF_KMCTR, &kmctr_functions);
1152 cpacf_query(CPACF_KMA, &kma_functions);
1153
1154 if (cpacf_test_func(&km_functions, CPACF_KM_AES_128) ||
1155 cpacf_test_func(&km_functions, CPACF_KM_AES_192) ||
1156 cpacf_test_func(&km_functions, CPACF_KM_AES_256)) {
1157 ret = aes_s390_register_alg(&aes_alg);
1158 if (ret)
1159 goto out_err;
1160 ret = aes_s390_register_alg(&ecb_aes_alg);
1161 if (ret)
1162 goto out_err;
1163 }
1164
1165 if (cpacf_test_func(&kmc_functions, CPACF_KMC_AES_128) ||
1166 cpacf_test_func(&kmc_functions, CPACF_KMC_AES_192) ||
1167 cpacf_test_func(&kmc_functions, CPACF_KMC_AES_256)) {
1168 ret = aes_s390_register_alg(&cbc_aes_alg);
1169 if (ret)
1170 goto out_err;
1171 }
1172
1173 if (cpacf_test_func(&km_functions, CPACF_KM_XTS_128) ||
1174 cpacf_test_func(&km_functions, CPACF_KM_XTS_256)) {
1175 ret = aes_s390_register_alg(&xts_aes_alg);
1176 if (ret)
1177 goto out_err;
1178 }
1179
1180 if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_128) ||
1181 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_192) ||
1182 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_256)) {
1183 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
1184 if (!ctrblk) {
1185 ret = -ENOMEM;
1186 goto out_err;
1187 }
1188 ret = aes_s390_register_alg(&ctr_aes_alg);
1189 if (ret)
1190 goto out_err;
1191 }
1192
1193 if (cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_128) ||
1194 cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_192) ||
1195 cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_256)) {
1196 ret = crypto_register_aead(&gcm_aes_aead);
1197 if (ret)
1198 goto out_err;
1199 aes_s390_aead_alg = &gcm_aes_aead;
1200 }
1201
1202 return 0;
1203 out_err:
1204 aes_s390_fini();
1205 return ret;
1206 }
1207
1208 module_cpu_feature_match(MSA, aes_s390_init);
1209 module_exit(aes_s390_fini);
1210
1211 MODULE_ALIAS_CRYPTO("aes-all");
1212
1213 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
1214 MODULE_LICENSE("GPL");