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[linux/fpc-iii.git] / arch / s390 / crypto / aes_s390.c
blobdd456725189f23be3b02e330d7494ab58ba26fe2
1 // SPDX-License-Identifier: GPL-2.0+
2 /*
3 * Cryptographic API.
4 *
5 * s390 implementation of the AES Cipher Algorithm.
6 *
7 * s390 Version:
8 * Copyright IBM Corp. 2005, 2017
9 * Author(s): Jan Glauber (jang@de.ibm.com)
10 * Sebastian Siewior (sebastian@breakpoint.cc> SW-Fallback
11 * Patrick Steuer <patrick.steuer@de.ibm.com>
12 * Harald Freudenberger <freude@de.ibm.com>
13 *
14 * Derived from "crypto/aes_generic.c"
15 */
16
17 #define KMSG_COMPONENT "aes_s390"
18 #define pr_fmt(fmt) KMSG_COMPONENT ": " fmt
19
20 #include <crypto/aes.h>
21 #include <crypto/algapi.h>
22 #include <crypto/ghash.h>
23 #include <crypto/internal/aead.h>
24 #include <crypto/internal/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/spinlock.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_SPINLOCK(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 /* Pick the correct function code based on the key length */
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 /* Check if the function code is available */
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 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 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 = aes_encrypt,
176 .cia_decrypt = 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 /* Pick the correct function code based on the key length */
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 /* Check if the function code is available */
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 /* only use complete blocks */
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, /* combo: aes + ecb + 1 */
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 /* Pick the correct function code based on the key length */
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 /* Check if the function code is available */
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 /* only use complete blocks */
389 n = nbytes & ~(AES_BLOCK_SIZE - 1);
390 cpacf_kmc(sctx->fc | modifier, &param,
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, /* ecb-aes-s390 + 1 */
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_check_key(tfm, in_key, key_len);
516 if (err)
517 return err;
518
519 /* In fips mode only 128 bit or 256 bit keys are valid */
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 /* Pick the correct function code based on the key length */
526 fc = (key_len == 32) ? CPACF_KM_XTS_128 :
527 (key_len == 64) ? CPACF_KM_XTS_256 : 0;
528
529 /* Check if the function code is available */
530 xts_ctx->fc = (fc && cpacf_test_func(&km_functions, fc)) ? fc : 0;
531 if (!xts_ctx->fc)
532 return xts_fallback_setkey(tfm, in_key, key_len);
533
534 /* Split the XTS key into the two subkeys */
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 /* only use complete blocks */
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 (unlikely(!xts_ctx->fc))
590 return xts_fallback_encrypt(desc, dst, src, nbytes);
591
592 blkcipher_walk_init(&walk, dst, src, nbytes);
593 return xts_aes_crypt(desc, 0, &walk);
594 }
595
596 static int xts_aes_decrypt(struct blkcipher_desc *desc,
597 struct scatterlist *dst, struct scatterlist *src,
598 unsigned int nbytes)
599 {
600 struct s390_xts_ctx *xts_ctx = crypto_blkcipher_ctx(desc->tfm);
601 struct blkcipher_walk walk;
602
603 if (unlikely(!xts_ctx->fc))
604 return xts_fallback_decrypt(desc, dst, src, nbytes);
605
606 blkcipher_walk_init(&walk, dst, src, nbytes);
607 return xts_aes_crypt(desc, CPACF_DECRYPT, &walk);
608 }
609
610 static int xts_fallback_init(struct crypto_tfm *tfm)
611 {
612 const char *name = tfm->__crt_alg->cra_name;
613 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
614
615 xts_ctx->fallback = crypto_alloc_sync_skcipher(name, 0,
616 CRYPTO_ALG_NEED_FALLBACK);
617
618 if (IS_ERR(xts_ctx->fallback)) {
619 pr_err("Allocating XTS fallback algorithm %s failed\n",
620 name);
621 return PTR_ERR(xts_ctx->fallback);
622 }
623 return 0;
624 }
625
626 static void xts_fallback_exit(struct crypto_tfm *tfm)
627 {
628 struct s390_xts_ctx *xts_ctx = crypto_tfm_ctx(tfm);
629
630 crypto_free_sync_skcipher(xts_ctx->fallback);
631 }
632
633 static struct crypto_alg xts_aes_alg = {
634 .cra_name = "xts(aes)",
635 .cra_driver_name = "xts-aes-s390",
636 .cra_priority = 402, /* ecb-aes-s390 + 1 */
637 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
638 CRYPTO_ALG_NEED_FALLBACK,
639 .cra_blocksize = AES_BLOCK_SIZE,
640 .cra_ctxsize = sizeof(struct s390_xts_ctx),
641 .cra_type = &crypto_blkcipher_type,
642 .cra_module = THIS_MODULE,
643 .cra_init = xts_fallback_init,
644 .cra_exit = xts_fallback_exit,
645 .cra_u = {
646 .blkcipher = {
647 .min_keysize = 2 * AES_MIN_KEY_SIZE,
648 .max_keysize = 2 * AES_MAX_KEY_SIZE,
649 .ivsize = AES_BLOCK_SIZE,
650 .setkey = xts_aes_set_key,
651 .encrypt = xts_aes_encrypt,
652 .decrypt = xts_aes_decrypt,
653 }
654 }
655 };
656
657 static int ctr_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
658 unsigned int key_len)
659 {
660 struct s390_aes_ctx *sctx = crypto_tfm_ctx(tfm);
661 unsigned long fc;
662
663 /* Pick the correct function code based on the key length */
664 fc = (key_len == 16) ? CPACF_KMCTR_AES_128 :
665 (key_len == 24) ? CPACF_KMCTR_AES_192 :
666 (key_len == 32) ? CPACF_KMCTR_AES_256 : 0;
667
668 /* Check if the function code is available */
669 sctx->fc = (fc && cpacf_test_func(&kmctr_functions, fc)) ? fc : 0;
670 if (!sctx->fc)
671 return setkey_fallback_blk(tfm, in_key, key_len);
672
673 sctx->key_len = key_len;
674 memcpy(sctx->key, in_key, key_len);
675 return 0;
676 }
677
678 static unsigned int __ctrblk_init(u8 *ctrptr, u8 *iv, unsigned int nbytes)
679 {
680 unsigned int i, n;
681
682 /* only use complete blocks, max. PAGE_SIZE */
683 memcpy(ctrptr, iv, AES_BLOCK_SIZE);
684 n = (nbytes > PAGE_SIZE) ? PAGE_SIZE : nbytes & ~(AES_BLOCK_SIZE - 1);
685 for (i = (n / AES_BLOCK_SIZE) - 1; i > 0; i--) {
686 memcpy(ctrptr + AES_BLOCK_SIZE, ctrptr, AES_BLOCK_SIZE);
687 crypto_inc(ctrptr + AES_BLOCK_SIZE, AES_BLOCK_SIZE);
688 ctrptr += AES_BLOCK_SIZE;
689 }
690 return n;
691 }
692
693 static int ctr_aes_crypt(struct blkcipher_desc *desc, unsigned long modifier,
694 struct blkcipher_walk *walk)
695 {
696 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
697 u8 buf[AES_BLOCK_SIZE], *ctrptr;
698 unsigned int n, nbytes;
699 int ret, locked;
700
701 locked = spin_trylock(&ctrblk_lock);
702
703 ret = blkcipher_walk_virt_block(desc, walk, AES_BLOCK_SIZE);
704 while ((nbytes = walk->nbytes) >= AES_BLOCK_SIZE) {
705 n = AES_BLOCK_SIZE;
706 if (nbytes >= 2*AES_BLOCK_SIZE && locked)
707 n = __ctrblk_init(ctrblk, walk->iv, nbytes);
708 ctrptr = (n > AES_BLOCK_SIZE) ? ctrblk : walk->iv;
709 cpacf_kmctr(sctx->fc | modifier, sctx->key,
710 walk->dst.virt.addr, walk->src.virt.addr,
711 n, ctrptr);
712 if (ctrptr == ctrblk)
713 memcpy(walk->iv, ctrptr + n - AES_BLOCK_SIZE,
714 AES_BLOCK_SIZE);
715 crypto_inc(walk->iv, AES_BLOCK_SIZE);
716 ret = blkcipher_walk_done(desc, walk, nbytes - n);
717 }
718 if (locked)
719 spin_unlock(&ctrblk_lock);
720 /*
721 * final block may be < AES_BLOCK_SIZE, copy only nbytes
722 */
723 if (nbytes) {
724 cpacf_kmctr(sctx->fc | modifier, sctx->key,
725 buf, walk->src.virt.addr,
726 AES_BLOCK_SIZE, walk->iv);
727 memcpy(walk->dst.virt.addr, buf, nbytes);
728 crypto_inc(walk->iv, AES_BLOCK_SIZE);
729 ret = blkcipher_walk_done(desc, walk, 0);
730 }
731
732 return ret;
733 }
734
735 static int ctr_aes_encrypt(struct blkcipher_desc *desc,
736 struct scatterlist *dst, struct scatterlist *src,
737 unsigned int nbytes)
738 {
739 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
740 struct blkcipher_walk walk;
741
742 if (unlikely(!sctx->fc))
743 return fallback_blk_enc(desc, dst, src, nbytes);
744
745 blkcipher_walk_init(&walk, dst, src, nbytes);
746 return ctr_aes_crypt(desc, 0, &walk);
747 }
748
749 static int ctr_aes_decrypt(struct blkcipher_desc *desc,
750 struct scatterlist *dst, struct scatterlist *src,
751 unsigned int nbytes)
752 {
753 struct s390_aes_ctx *sctx = crypto_blkcipher_ctx(desc->tfm);
754 struct blkcipher_walk walk;
755
756 if (unlikely(!sctx->fc))
757 return fallback_blk_dec(desc, dst, src, nbytes);
758
759 blkcipher_walk_init(&walk, dst, src, nbytes);
760 return ctr_aes_crypt(desc, CPACF_DECRYPT, &walk);
761 }
762
763 static struct crypto_alg ctr_aes_alg = {
764 .cra_name = "ctr(aes)",
765 .cra_driver_name = "ctr-aes-s390",
766 .cra_priority = 402, /* ecb-aes-s390 + 1 */
767 .cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER |
768 CRYPTO_ALG_NEED_FALLBACK,
769 .cra_blocksize = 1,
770 .cra_ctxsize = sizeof(struct s390_aes_ctx),
771 .cra_type = &crypto_blkcipher_type,
772 .cra_module = THIS_MODULE,
773 .cra_init = fallback_init_blk,
774 .cra_exit = fallback_exit_blk,
775 .cra_u = {
776 .blkcipher = {
777 .min_keysize = AES_MIN_KEY_SIZE,
778 .max_keysize = AES_MAX_KEY_SIZE,
779 .ivsize = AES_BLOCK_SIZE,
780 .setkey = ctr_aes_set_key,
781 .encrypt = ctr_aes_encrypt,
782 .decrypt = ctr_aes_decrypt,
783 }
784 }
785 };
786
787 static int gcm_aes_setkey(struct crypto_aead *tfm, const u8 *key,
788 unsigned int keylen)
789 {
790 struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
791
792 switch (keylen) {
793 case AES_KEYSIZE_128:
794 ctx->fc = CPACF_KMA_GCM_AES_128;
795 break;
796 case AES_KEYSIZE_192:
797 ctx->fc = CPACF_KMA_GCM_AES_192;
798 break;
799 case AES_KEYSIZE_256:
800 ctx->fc = CPACF_KMA_GCM_AES_256;
801 break;
802 default:
803 return -EINVAL;
804 }
805
806 memcpy(ctx->key, key, keylen);
807 ctx->key_len = keylen;
808 return 0;
809 }
810
811 static int gcm_aes_setauthsize(struct crypto_aead *tfm, unsigned int authsize)
812 {
813 switch (authsize) {
814 case 4:
815 case 8:
816 case 12:
817 case 13:
818 case 14:
819 case 15:
820 case 16:
821 break;
822 default:
823 return -EINVAL;
824 }
825
826 return 0;
827 }
828
829 static void gcm_sg_walk_start(struct gcm_sg_walk *gw, struct scatterlist *sg,
830 unsigned int len)
831 {
832 memset(gw, 0, sizeof(*gw));
833 gw->walk_bytes_remain = len;
834 scatterwalk_start(&gw->walk, sg);
835 }
836
837 static int gcm_sg_walk_go(struct gcm_sg_walk *gw, unsigned int minbytesneeded)
838 {
839 int n;
840
841 /* minbytesneeded <= AES_BLOCK_SIZE */
842 if (gw->buf_bytes && gw->buf_bytes >= minbytesneeded) {
843 gw->ptr = gw->buf;
844 gw->nbytes = gw->buf_bytes;
845 goto out;
846 }
847
848 if (gw->walk_bytes_remain == 0) {
849 gw->ptr = NULL;
850 gw->nbytes = 0;
851 goto out;
852 }
853
854 gw->walk_bytes = scatterwalk_clamp(&gw->walk, gw->walk_bytes_remain);
855 if (!gw->walk_bytes) {
856 scatterwalk_start(&gw->walk, sg_next(gw->walk.sg));
857 gw->walk_bytes = scatterwalk_clamp(&gw->walk,
858 gw->walk_bytes_remain);
859 }
860 gw->walk_ptr = scatterwalk_map(&gw->walk);
861
862 if (!gw->buf_bytes && gw->walk_bytes >= minbytesneeded) {
863 gw->ptr = gw->walk_ptr;
864 gw->nbytes = gw->walk_bytes;
865 goto out;
866 }
867
868 while (1) {
869 n = min(gw->walk_bytes, AES_BLOCK_SIZE - gw->buf_bytes);
870 memcpy(gw->buf + gw->buf_bytes, gw->walk_ptr, n);
871 gw->buf_bytes += n;
872 gw->walk_bytes_remain -= n;
873 scatterwalk_unmap(&gw->walk);
874 scatterwalk_advance(&gw->walk, n);
875 scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
876
877 if (gw->buf_bytes >= minbytesneeded) {
878 gw->ptr = gw->buf;
879 gw->nbytes = gw->buf_bytes;
880 goto out;
881 }
882
883 gw->walk_bytes = scatterwalk_clamp(&gw->walk,
884 gw->walk_bytes_remain);
885 if (!gw->walk_bytes) {
886 scatterwalk_start(&gw->walk, sg_next(gw->walk.sg));
887 gw->walk_bytes = scatterwalk_clamp(&gw->walk,
888 gw->walk_bytes_remain);
889 }
890 gw->walk_ptr = scatterwalk_map(&gw->walk);
891 }
892
893 out:
894 return gw->nbytes;
895 }
896
897 static void gcm_sg_walk_done(struct gcm_sg_walk *gw, unsigned int bytesdone)
898 {
899 int n;
900
901 if (gw->ptr == NULL)
902 return;
903
904 if (gw->ptr == gw->buf) {
905 n = gw->buf_bytes - bytesdone;
906 if (n > 0) {
907 memmove(gw->buf, gw->buf + bytesdone, n);
908 gw->buf_bytes -= n;
909 } else
910 gw->buf_bytes = 0;
911 } else {
912 gw->walk_bytes_remain -= bytesdone;
913 scatterwalk_unmap(&gw->walk);
914 scatterwalk_advance(&gw->walk, bytesdone);
915 scatterwalk_done(&gw->walk, 0, gw->walk_bytes_remain);
916 }
917 }
918
919 static int gcm_aes_crypt(struct aead_request *req, unsigned int flags)
920 {
921 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
922 struct s390_aes_ctx *ctx = crypto_aead_ctx(tfm);
923 unsigned int ivsize = crypto_aead_ivsize(tfm);
924 unsigned int taglen = crypto_aead_authsize(tfm);
925 unsigned int aadlen = req->assoclen;
926 unsigned int pclen = req->cryptlen;
927 int ret = 0;
928
929 unsigned int len, in_bytes, out_bytes,
930 min_bytes, bytes, aad_bytes, pc_bytes;
931 struct gcm_sg_walk gw_in, gw_out;
932 u8 tag[GHASH_DIGEST_SIZE];
933
934 struct {
935 u32 _[3]; /* reserved */
936 u32 cv; /* Counter Value */
937 u8 t[GHASH_DIGEST_SIZE];/* Tag */
938 u8 h[AES_BLOCK_SIZE]; /* Hash-subkey */
939 u64 taadl; /* Total AAD Length */
940 u64 tpcl; /* Total Plain-/Cipher-text Length */
941 u8 j0[GHASH_BLOCK_SIZE];/* initial counter value */
942 u8 k[AES_MAX_KEY_SIZE]; /* Key */
943 } param;
944
945 /*
946 * encrypt
947 * req->src: aad||plaintext
948 * req->dst: aad||ciphertext||tag
949 * decrypt
950 * req->src: aad||ciphertext||tag
951 * req->dst: aad||plaintext, return 0 or -EBADMSG
952 * aad, plaintext and ciphertext may be empty.
953 */
954 if (flags & CPACF_DECRYPT)
955 pclen -= taglen;
956 len = aadlen + pclen;
957
958 memset(&param, 0, sizeof(param));
959 param.cv = 1;
960 param.taadl = aadlen * 8;
961 param.tpcl = pclen * 8;
962 memcpy(param.j0, req->iv, ivsize);
963 *(u32 *)(param.j0 + ivsize) = 1;
964 memcpy(param.k, ctx->key, ctx->key_len);
965
966 gcm_sg_walk_start(&gw_in, req->src, len);
967 gcm_sg_walk_start(&gw_out, req->dst, len);
968
969 do {
970 min_bytes = min_t(unsigned int,
971 aadlen > 0 ? aadlen : pclen, AES_BLOCK_SIZE);
972 in_bytes = gcm_sg_walk_go(&gw_in, min_bytes);
973 out_bytes = gcm_sg_walk_go(&gw_out, min_bytes);
974 bytes = min(in_bytes, out_bytes);
975
976 if (aadlen + pclen <= bytes) {
977 aad_bytes = aadlen;
978 pc_bytes = pclen;
979 flags |= CPACF_KMA_LAAD | CPACF_KMA_LPC;
980 } else {
981 if (aadlen <= bytes) {
982 aad_bytes = aadlen;
983 pc_bytes = (bytes - aadlen) &
984 ~(AES_BLOCK_SIZE - 1);
985 flags |= CPACF_KMA_LAAD;
986 } else {
987 aad_bytes = bytes & ~(AES_BLOCK_SIZE - 1);
988 pc_bytes = 0;
989 }
990 }
991
992 if (aad_bytes > 0)
993 memcpy(gw_out.ptr, gw_in.ptr, aad_bytes);
994
995 cpacf_kma(ctx->fc | flags, &param,
996 gw_out.ptr + aad_bytes,
997 gw_in.ptr + aad_bytes, pc_bytes,
998 gw_in.ptr, aad_bytes);
999
1000 gcm_sg_walk_done(&gw_in, aad_bytes + pc_bytes);
1001 gcm_sg_walk_done(&gw_out, aad_bytes + pc_bytes);
1002 aadlen -= aad_bytes;
1003 pclen -= pc_bytes;
1004 } while (aadlen + pclen > 0);
1005
1006 if (flags & CPACF_DECRYPT) {
1007 scatterwalk_map_and_copy(tag, req->src, len, taglen, 0);
1008 if (crypto_memneq(tag, param.t, taglen))
1009 ret = -EBADMSG;
1010 } else
1011 scatterwalk_map_and_copy(param.t, req->dst, len, taglen, 1);
1012
1013 memzero_explicit(&param, sizeof(param));
1014 return ret;
1015 }
1016
1017 static int gcm_aes_encrypt(struct aead_request *req)
1018 {
1019 return gcm_aes_crypt(req, CPACF_ENCRYPT);
1020 }
1021
1022 static int gcm_aes_decrypt(struct aead_request *req)
1023 {
1024 return gcm_aes_crypt(req, CPACF_DECRYPT);
1025 }
1026
1027 static struct aead_alg gcm_aes_aead = {
1028 .setkey = gcm_aes_setkey,
1029 .setauthsize = gcm_aes_setauthsize,
1030 .encrypt = gcm_aes_encrypt,
1031 .decrypt = gcm_aes_decrypt,
1032
1033 .ivsize = GHASH_BLOCK_SIZE - sizeof(u32),
1034 .maxauthsize = GHASH_DIGEST_SIZE,
1035 .chunksize = AES_BLOCK_SIZE,
1036
1037 .base = {
1038 .cra_blocksize = 1,
1039 .cra_ctxsize = sizeof(struct s390_aes_ctx),
1040 .cra_priority = 900,
1041 .cra_name = "gcm(aes)",
1042 .cra_driver_name = "gcm-aes-s390",
1043 .cra_module = THIS_MODULE,
1044 },
1045 };
1046
1047 static struct crypto_alg *aes_s390_algs_ptr[5];
1048 static int aes_s390_algs_num;
1049 static struct aead_alg *aes_s390_aead_alg;
1050
1051 static int aes_s390_register_alg(struct crypto_alg *alg)
1052 {
1053 int ret;
1054
1055 ret = crypto_register_alg(alg);
1056 if (!ret)
1057 aes_s390_algs_ptr[aes_s390_algs_num++] = alg;
1058 return ret;
1059 }
1060
1061 static void aes_s390_fini(void)
1062 {
1063 while (aes_s390_algs_num--)
1064 crypto_unregister_alg(aes_s390_algs_ptr[aes_s390_algs_num]);
1065 if (ctrblk)
1066 free_page((unsigned long) ctrblk);
1067
1068 if (aes_s390_aead_alg)
1069 crypto_unregister_aead(aes_s390_aead_alg);
1070 }
1071
1072 static int __init aes_s390_init(void)
1073 {
1074 int ret;
1075
1076 /* Query available functions for KM, KMC, KMCTR and KMA */
1077 cpacf_query(CPACF_KM, &km_functions);
1078 cpacf_query(CPACF_KMC, &kmc_functions);
1079 cpacf_query(CPACF_KMCTR, &kmctr_functions);
1080 cpacf_query(CPACF_KMA, &kma_functions);
1081
1082 if (cpacf_test_func(&km_functions, CPACF_KM_AES_128) ||
1083 cpacf_test_func(&km_functions, CPACF_KM_AES_192) ||
1084 cpacf_test_func(&km_functions, CPACF_KM_AES_256)) {
1085 ret = aes_s390_register_alg(&aes_alg);
1086 if (ret)
1087 goto out_err;
1088 ret = aes_s390_register_alg(&ecb_aes_alg);
1089 if (ret)
1090 goto out_err;
1091 }
1092
1093 if (cpacf_test_func(&kmc_functions, CPACF_KMC_AES_128) ||
1094 cpacf_test_func(&kmc_functions, CPACF_KMC_AES_192) ||
1095 cpacf_test_func(&kmc_functions, CPACF_KMC_AES_256)) {
1096 ret = aes_s390_register_alg(&cbc_aes_alg);
1097 if (ret)
1098 goto out_err;
1099 }
1100
1101 if (cpacf_test_func(&km_functions, CPACF_KM_XTS_128) ||
1102 cpacf_test_func(&km_functions, CPACF_KM_XTS_256)) {
1103 ret = aes_s390_register_alg(&xts_aes_alg);
1104 if (ret)
1105 goto out_err;
1106 }
1107
1108 if (cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_128) ||
1109 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_192) ||
1110 cpacf_test_func(&kmctr_functions, CPACF_KMCTR_AES_256)) {
1111 ctrblk = (u8 *) __get_free_page(GFP_KERNEL);
1112 if (!ctrblk) {
1113 ret = -ENOMEM;
1114 goto out_err;
1115 }
1116 ret = aes_s390_register_alg(&ctr_aes_alg);
1117 if (ret)
1118 goto out_err;
1119 }
1120
1121 if (cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_128) ||
1122 cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_192) ||
1123 cpacf_test_func(&kma_functions, CPACF_KMA_GCM_AES_256)) {
1124 ret = crypto_register_aead(&gcm_aes_aead);
1125 if (ret)
1126 goto out_err;
1127 aes_s390_aead_alg = &gcm_aes_aead;
1128 }
1129
1130 return 0;
1131 out_err:
1132 aes_s390_fini();
1133 return ret;
1134 }
1135
1136 module_cpu_feature_match(MSA, aes_s390_init);
1137 module_exit(aes_s390_fini);
1138
1139 MODULE_ALIAS_CRYPTO("aes-all");
1140
1141 MODULE_DESCRIPTION("Rijndael (AES) Cipher Algorithm");
1142 MODULE_LICENSE("GPL");
Linux with added FPC-III support