xref: /openbmc/linux/crypto/gcm.c (revision 08720988)
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * GCM: Galois/Counter Mode.
4  *
5  * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
6  */
7 
8 #include <crypto/gf128mul.h>
9 #include <crypto/internal/aead.h>
10 #include <crypto/internal/skcipher.h>
11 #include <crypto/internal/hash.h>
12 #include <crypto/null.h>
13 #include <crypto/scatterwalk.h>
14 #include <crypto/gcm.h>
15 #include <crypto/hash.h>
16 #include <linux/err.h>
17 #include <linux/init.h>
18 #include <linux/kernel.h>
19 #include <linux/module.h>
20 #include <linux/slab.h>
21 
22 struct gcm_instance_ctx {
23 	struct crypto_skcipher_spawn ctr;
24 	struct crypto_ahash_spawn ghash;
25 };
26 
27 struct crypto_gcm_ctx {
28 	struct crypto_skcipher *ctr;
29 	struct crypto_ahash *ghash;
30 };
31 
32 struct crypto_rfc4106_ctx {
33 	struct crypto_aead *child;
34 	u8 nonce[4];
35 };
36 
37 struct crypto_rfc4106_req_ctx {
38 	struct scatterlist src[3];
39 	struct scatterlist dst[3];
40 	struct aead_request subreq;
41 };
42 
43 struct crypto_rfc4543_instance_ctx {
44 	struct crypto_aead_spawn aead;
45 };
46 
47 struct crypto_rfc4543_ctx {
48 	struct crypto_aead *child;
49 	struct crypto_sync_skcipher *null;
50 	u8 nonce[4];
51 };
52 
53 struct crypto_rfc4543_req_ctx {
54 	struct aead_request subreq;
55 };
56 
57 struct crypto_gcm_ghash_ctx {
58 	unsigned int cryptlen;
59 	struct scatterlist *src;
60 	int (*complete)(struct aead_request *req, u32 flags);
61 };
62 
63 struct crypto_gcm_req_priv_ctx {
64 	u8 iv[16];
65 	u8 auth_tag[16];
66 	u8 iauth_tag[16];
67 	struct scatterlist src[3];
68 	struct scatterlist dst[3];
69 	struct scatterlist sg;
70 	struct crypto_gcm_ghash_ctx ghash_ctx;
71 	union {
72 		struct ahash_request ahreq;
73 		struct skcipher_request skreq;
74 	} u;
75 };
76 
77 static struct {
78 	u8 buf[16];
79 	struct scatterlist sg;
80 } *gcm_zeroes;
81 
82 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
83 
84 static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
85 	struct aead_request *req)
86 {
87 	unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
88 
89 	return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
90 }
91 
92 static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
93 			     unsigned int keylen)
94 {
95 	struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
96 	struct crypto_ahash *ghash = ctx->ghash;
97 	struct crypto_skcipher *ctr = ctx->ctr;
98 	struct {
99 		be128 hash;
100 		u8 iv[16];
101 
102 		struct crypto_wait wait;
103 
104 		struct scatterlist sg[1];
105 		struct skcipher_request req;
106 	} *data;
107 	int err;
108 
109 	crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
110 	crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
111 				       CRYPTO_TFM_REQ_MASK);
112 	err = crypto_skcipher_setkey(ctr, key, keylen);
113 	if (err)
114 		return err;
115 
116 	data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
117 		       GFP_KERNEL);
118 	if (!data)
119 		return -ENOMEM;
120 
121 	crypto_init_wait(&data->wait);
122 	sg_init_one(data->sg, &data->hash, sizeof(data->hash));
123 	skcipher_request_set_tfm(&data->req, ctr);
124 	skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
125 						  CRYPTO_TFM_REQ_MAY_BACKLOG,
126 				      crypto_req_done,
127 				      &data->wait);
128 	skcipher_request_set_crypt(&data->req, data->sg, data->sg,
129 				   sizeof(data->hash), data->iv);
130 
131 	err = crypto_wait_req(crypto_skcipher_encrypt(&data->req),
132 							&data->wait);
133 
134 	if (err)
135 		goto out;
136 
137 	crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
138 	crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
139 			       CRYPTO_TFM_REQ_MASK);
140 	err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
141 out:
142 	kzfree(data);
143 	return err;
144 }
145 
146 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
147 				  unsigned int authsize)
148 {
149 	return crypto_gcm_check_authsize(authsize);
150 }
151 
152 static void crypto_gcm_init_common(struct aead_request *req)
153 {
154 	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
155 	__be32 counter = cpu_to_be32(1);
156 	struct scatterlist *sg;
157 
158 	memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
159 	memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE);
160 	memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4);
161 
162 	sg_init_table(pctx->src, 3);
163 	sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
164 	sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
165 	if (sg != pctx->src + 1)
166 		sg_chain(pctx->src, 2, sg);
167 
168 	if (req->src != req->dst) {
169 		sg_init_table(pctx->dst, 3);
170 		sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
171 		sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
172 		if (sg != pctx->dst + 1)
173 			sg_chain(pctx->dst, 2, sg);
174 	}
175 }
176 
177 static void crypto_gcm_init_crypt(struct aead_request *req,
178 				  unsigned int cryptlen)
179 {
180 	struct crypto_aead *aead = crypto_aead_reqtfm(req);
181 	struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
182 	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
183 	struct skcipher_request *skreq = &pctx->u.skreq;
184 	struct scatterlist *dst;
185 
186 	dst = req->src == req->dst ? pctx->src : pctx->dst;
187 
188 	skcipher_request_set_tfm(skreq, ctx->ctr);
189 	skcipher_request_set_crypt(skreq, pctx->src, dst,
190 				     cryptlen + sizeof(pctx->auth_tag),
191 				     pctx->iv);
192 }
193 
194 static inline unsigned int gcm_remain(unsigned int len)
195 {
196 	len &= 0xfU;
197 	return len ? 16 - len : 0;
198 }
199 
200 static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
201 
202 static int gcm_hash_update(struct aead_request *req,
203 			   crypto_completion_t compl,
204 			   struct scatterlist *src,
205 			   unsigned int len, u32 flags)
206 {
207 	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
208 	struct ahash_request *ahreq = &pctx->u.ahreq;
209 
210 	ahash_request_set_callback(ahreq, flags, compl, req);
211 	ahash_request_set_crypt(ahreq, src, NULL, len);
212 
213 	return crypto_ahash_update(ahreq);
214 }
215 
216 static int gcm_hash_remain(struct aead_request *req,
217 			   unsigned int remain,
218 			   crypto_completion_t compl, u32 flags)
219 {
220 	return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
221 }
222 
223 static int gcm_hash_len(struct aead_request *req, u32 flags)
224 {
225 	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
226 	struct ahash_request *ahreq = &pctx->u.ahreq;
227 	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
228 	be128 lengths;
229 
230 	lengths.a = cpu_to_be64(req->assoclen * 8);
231 	lengths.b = cpu_to_be64(gctx->cryptlen * 8);
232 	memcpy(pctx->iauth_tag, &lengths, 16);
233 	sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
234 	ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
235 	ahash_request_set_crypt(ahreq, &pctx->sg,
236 				pctx->iauth_tag, sizeof(lengths));
237 
238 	return crypto_ahash_finup(ahreq);
239 }
240 
241 static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
242 {
243 	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
244 	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
245 
246 	return gctx->complete(req, flags);
247 }
248 
249 static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
250 {
251 	struct aead_request *req = areq->data;
252 
253 	if (err)
254 		goto out;
255 
256 	err = gcm_hash_len_continue(req, 0);
257 	if (err == -EINPROGRESS)
258 		return;
259 
260 out:
261 	aead_request_complete(req, err);
262 }
263 
264 static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
265 {
266 	return gcm_hash_len(req, flags) ?:
267 	       gcm_hash_len_continue(req, flags);
268 }
269 
270 static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
271 				       int err)
272 {
273 	struct aead_request *req = areq->data;
274 
275 	if (err)
276 		goto out;
277 
278 	err = gcm_hash_crypt_remain_continue(req, 0);
279 	if (err == -EINPROGRESS)
280 		return;
281 
282 out:
283 	aead_request_complete(req, err);
284 }
285 
286 static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
287 {
288 	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
289 	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
290 	unsigned int remain;
291 
292 	remain = gcm_remain(gctx->cryptlen);
293 	if (remain)
294 		return gcm_hash_remain(req, remain,
295 				       gcm_hash_crypt_remain_done, flags) ?:
296 		       gcm_hash_crypt_remain_continue(req, flags);
297 
298 	return gcm_hash_crypt_remain_continue(req, flags);
299 }
300 
301 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
302 {
303 	struct aead_request *req = areq->data;
304 
305 	if (err)
306 		goto out;
307 
308 	err = gcm_hash_crypt_continue(req, 0);
309 	if (err == -EINPROGRESS)
310 		return;
311 
312 out:
313 	aead_request_complete(req, err);
314 }
315 
316 static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
317 {
318 	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
319 	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
320 
321 	if (gctx->cryptlen)
322 		return gcm_hash_update(req, gcm_hash_crypt_done,
323 				       gctx->src, gctx->cryptlen, flags) ?:
324 		       gcm_hash_crypt_continue(req, flags);
325 
326 	return gcm_hash_crypt_remain_continue(req, flags);
327 }
328 
329 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
330 				       int err)
331 {
332 	struct aead_request *req = areq->data;
333 
334 	if (err)
335 		goto out;
336 
337 	err = gcm_hash_assoc_remain_continue(req, 0);
338 	if (err == -EINPROGRESS)
339 		return;
340 
341 out:
342 	aead_request_complete(req, err);
343 }
344 
345 static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
346 {
347 	unsigned int remain;
348 
349 	remain = gcm_remain(req->assoclen);
350 	if (remain)
351 		return gcm_hash_remain(req, remain,
352 				       gcm_hash_assoc_remain_done, flags) ?:
353 		       gcm_hash_assoc_remain_continue(req, flags);
354 
355 	return gcm_hash_assoc_remain_continue(req, flags);
356 }
357 
358 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
359 {
360 	struct aead_request *req = areq->data;
361 
362 	if (err)
363 		goto out;
364 
365 	err = gcm_hash_assoc_continue(req, 0);
366 	if (err == -EINPROGRESS)
367 		return;
368 
369 out:
370 	aead_request_complete(req, err);
371 }
372 
373 static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
374 {
375 	if (req->assoclen)
376 		return gcm_hash_update(req, gcm_hash_assoc_done,
377 				       req->src, req->assoclen, flags) ?:
378 		       gcm_hash_assoc_continue(req, flags);
379 
380 	return gcm_hash_assoc_remain_continue(req, flags);
381 }
382 
383 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
384 {
385 	struct aead_request *req = areq->data;
386 
387 	if (err)
388 		goto out;
389 
390 	err = gcm_hash_init_continue(req, 0);
391 	if (err == -EINPROGRESS)
392 		return;
393 
394 out:
395 	aead_request_complete(req, err);
396 }
397 
398 static int gcm_hash(struct aead_request *req, u32 flags)
399 {
400 	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
401 	struct ahash_request *ahreq = &pctx->u.ahreq;
402 	struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
403 
404 	ahash_request_set_tfm(ahreq, ctx->ghash);
405 
406 	ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
407 	return crypto_ahash_init(ahreq) ?:
408 	       gcm_hash_init_continue(req, flags);
409 }
410 
411 static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
412 {
413 	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
414 	struct crypto_aead *aead = crypto_aead_reqtfm(req);
415 	u8 *auth_tag = pctx->auth_tag;
416 
417 	crypto_xor(auth_tag, pctx->iauth_tag, 16);
418 	scatterwalk_map_and_copy(auth_tag, req->dst,
419 				 req->assoclen + req->cryptlen,
420 				 crypto_aead_authsize(aead), 1);
421 	return 0;
422 }
423 
424 static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
425 {
426 	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
427 	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
428 
429 	gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
430 	gctx->cryptlen = req->cryptlen;
431 	gctx->complete = gcm_enc_copy_hash;
432 
433 	return gcm_hash(req, flags);
434 }
435 
436 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
437 {
438 	struct aead_request *req = areq->data;
439 
440 	if (err)
441 		goto out;
442 
443 	err = gcm_encrypt_continue(req, 0);
444 	if (err == -EINPROGRESS)
445 		return;
446 
447 out:
448 	aead_request_complete(req, err);
449 }
450 
451 static int crypto_gcm_encrypt(struct aead_request *req)
452 {
453 	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
454 	struct skcipher_request *skreq = &pctx->u.skreq;
455 	u32 flags = aead_request_flags(req);
456 
457 	crypto_gcm_init_common(req);
458 	crypto_gcm_init_crypt(req, req->cryptlen);
459 	skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
460 
461 	return crypto_skcipher_encrypt(skreq) ?:
462 	       gcm_encrypt_continue(req, flags);
463 }
464 
465 static int crypto_gcm_verify(struct aead_request *req)
466 {
467 	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
468 	struct crypto_aead *aead = crypto_aead_reqtfm(req);
469 	u8 *auth_tag = pctx->auth_tag;
470 	u8 *iauth_tag = pctx->iauth_tag;
471 	unsigned int authsize = crypto_aead_authsize(aead);
472 	unsigned int cryptlen = req->cryptlen - authsize;
473 
474 	crypto_xor(auth_tag, iauth_tag, 16);
475 	scatterwalk_map_and_copy(iauth_tag, req->src,
476 				 req->assoclen + cryptlen, authsize, 0);
477 	return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
478 }
479 
480 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
481 {
482 	struct aead_request *req = areq->data;
483 
484 	if (!err)
485 		err = crypto_gcm_verify(req);
486 
487 	aead_request_complete(req, err);
488 }
489 
490 static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
491 {
492 	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
493 	struct skcipher_request *skreq = &pctx->u.skreq;
494 	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
495 
496 	crypto_gcm_init_crypt(req, gctx->cryptlen);
497 	skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
498 	return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
499 }
500 
501 static int crypto_gcm_decrypt(struct aead_request *req)
502 {
503 	struct crypto_aead *aead = crypto_aead_reqtfm(req);
504 	struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
505 	struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
506 	unsigned int authsize = crypto_aead_authsize(aead);
507 	unsigned int cryptlen = req->cryptlen;
508 	u32 flags = aead_request_flags(req);
509 
510 	cryptlen -= authsize;
511 
512 	crypto_gcm_init_common(req);
513 
514 	gctx->src = sg_next(pctx->src);
515 	gctx->cryptlen = cryptlen;
516 	gctx->complete = gcm_dec_hash_continue;
517 
518 	return gcm_hash(req, flags);
519 }
520 
521 static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
522 {
523 	struct aead_instance *inst = aead_alg_instance(tfm);
524 	struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
525 	struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
526 	struct crypto_skcipher *ctr;
527 	struct crypto_ahash *ghash;
528 	unsigned long align;
529 	int err;
530 
531 	ghash = crypto_spawn_ahash(&ictx->ghash);
532 	if (IS_ERR(ghash))
533 		return PTR_ERR(ghash);
534 
535 	ctr = crypto_spawn_skcipher(&ictx->ctr);
536 	err = PTR_ERR(ctr);
537 	if (IS_ERR(ctr))
538 		goto err_free_hash;
539 
540 	ctx->ctr = ctr;
541 	ctx->ghash = ghash;
542 
543 	align = crypto_aead_alignmask(tfm);
544 	align &= ~(crypto_tfm_ctx_alignment() - 1);
545 	crypto_aead_set_reqsize(tfm,
546 		align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
547 		max(sizeof(struct skcipher_request) +
548 		    crypto_skcipher_reqsize(ctr),
549 		    sizeof(struct ahash_request) +
550 		    crypto_ahash_reqsize(ghash)));
551 
552 	return 0;
553 
554 err_free_hash:
555 	crypto_free_ahash(ghash);
556 	return err;
557 }
558 
559 static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
560 {
561 	struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
562 
563 	crypto_free_ahash(ctx->ghash);
564 	crypto_free_skcipher(ctx->ctr);
565 }
566 
567 static void crypto_gcm_free(struct aead_instance *inst)
568 {
569 	struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
570 
571 	crypto_drop_skcipher(&ctx->ctr);
572 	crypto_drop_ahash(&ctx->ghash);
573 	kfree(inst);
574 }
575 
576 static int crypto_gcm_create_common(struct crypto_template *tmpl,
577 				    struct rtattr **tb,
578 				    const char *ctr_name,
579 				    const char *ghash_name)
580 {
581 	struct crypto_attr_type *algt;
582 	u32 mask;
583 	struct aead_instance *inst;
584 	struct gcm_instance_ctx *ctx;
585 	struct skcipher_alg *ctr;
586 	struct hash_alg_common *ghash;
587 	int err;
588 
589 	algt = crypto_get_attr_type(tb);
590 	if (IS_ERR(algt))
591 		return PTR_ERR(algt);
592 
593 	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
594 		return -EINVAL;
595 
596 	mask = crypto_requires_sync(algt->type, algt->mask);
597 
598 	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
599 	if (!inst)
600 		return -ENOMEM;
601 	ctx = aead_instance_ctx(inst);
602 
603 	err = crypto_grab_ahash(&ctx->ghash, aead_crypto_instance(inst),
604 				ghash_name, 0, mask);
605 	if (err)
606 		goto err_free_inst;
607 	ghash = crypto_spawn_ahash_alg(&ctx->ghash);
608 
609 	err = -EINVAL;
610 	if (strcmp(ghash->base.cra_name, "ghash") != 0 ||
611 	    ghash->digestsize != 16)
612 		goto err_free_inst;
613 
614 	err = crypto_grab_skcipher(&ctx->ctr, aead_crypto_instance(inst),
615 				   ctr_name, 0, mask);
616 	if (err)
617 		goto err_free_inst;
618 	ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
619 
620 	/* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
621 	err = -EINVAL;
622 	if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
623 	    crypto_skcipher_alg_ivsize(ctr) != 16 ||
624 	    ctr->base.cra_blocksize != 1)
625 		goto err_free_inst;
626 
627 	err = -ENAMETOOLONG;
628 	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
629 		     "gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
630 		goto err_free_inst;
631 
632 	if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
633 		     "gcm_base(%s,%s)", ctr->base.cra_driver_name,
634 		     ghash->base.cra_driver_name) >=
635 	    CRYPTO_MAX_ALG_NAME)
636 		goto err_free_inst;
637 
638 	inst->alg.base.cra_flags = (ghash->base.cra_flags |
639 				    ctr->base.cra_flags) & CRYPTO_ALG_ASYNC;
640 	inst->alg.base.cra_priority = (ghash->base.cra_priority +
641 				       ctr->base.cra_priority) / 2;
642 	inst->alg.base.cra_blocksize = 1;
643 	inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
644 				       ctr->base.cra_alignmask;
645 	inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
646 	inst->alg.ivsize = GCM_AES_IV_SIZE;
647 	inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
648 	inst->alg.maxauthsize = 16;
649 	inst->alg.init = crypto_gcm_init_tfm;
650 	inst->alg.exit = crypto_gcm_exit_tfm;
651 	inst->alg.setkey = crypto_gcm_setkey;
652 	inst->alg.setauthsize = crypto_gcm_setauthsize;
653 	inst->alg.encrypt = crypto_gcm_encrypt;
654 	inst->alg.decrypt = crypto_gcm_decrypt;
655 
656 	inst->free = crypto_gcm_free;
657 
658 	err = aead_register_instance(tmpl, inst);
659 	if (err) {
660 err_free_inst:
661 		crypto_gcm_free(inst);
662 	}
663 	return err;
664 }
665 
666 static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
667 {
668 	const char *cipher_name;
669 	char ctr_name[CRYPTO_MAX_ALG_NAME];
670 
671 	cipher_name = crypto_attr_alg_name(tb[1]);
672 	if (IS_ERR(cipher_name))
673 		return PTR_ERR(cipher_name);
674 
675 	if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
676 	    CRYPTO_MAX_ALG_NAME)
677 		return -ENAMETOOLONG;
678 
679 	return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash");
680 }
681 
682 static int crypto_gcm_base_create(struct crypto_template *tmpl,
683 				  struct rtattr **tb)
684 {
685 	const char *ctr_name;
686 	const char *ghash_name;
687 
688 	ctr_name = crypto_attr_alg_name(tb[1]);
689 	if (IS_ERR(ctr_name))
690 		return PTR_ERR(ctr_name);
691 
692 	ghash_name = crypto_attr_alg_name(tb[2]);
693 	if (IS_ERR(ghash_name))
694 		return PTR_ERR(ghash_name);
695 
696 	return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name);
697 }
698 
699 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
700 				 unsigned int keylen)
701 {
702 	struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
703 	struct crypto_aead *child = ctx->child;
704 
705 	if (keylen < 4)
706 		return -EINVAL;
707 
708 	keylen -= 4;
709 	memcpy(ctx->nonce, key + keylen, 4);
710 
711 	crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
712 	crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
713 				     CRYPTO_TFM_REQ_MASK);
714 	return crypto_aead_setkey(child, key, keylen);
715 }
716 
717 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
718 				      unsigned int authsize)
719 {
720 	struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
721 	int err;
722 
723 	err = crypto_rfc4106_check_authsize(authsize);
724 	if (err)
725 		return err;
726 
727 	return crypto_aead_setauthsize(ctx->child, authsize);
728 }
729 
730 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
731 {
732 	struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
733 	struct crypto_aead *aead = crypto_aead_reqtfm(req);
734 	struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
735 	struct aead_request *subreq = &rctx->subreq;
736 	struct crypto_aead *child = ctx->child;
737 	struct scatterlist *sg;
738 	u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
739 			   crypto_aead_alignmask(child) + 1);
740 
741 	scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
742 
743 	memcpy(iv, ctx->nonce, 4);
744 	memcpy(iv + 4, req->iv, 8);
745 
746 	sg_init_table(rctx->src, 3);
747 	sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
748 	sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
749 	if (sg != rctx->src + 1)
750 		sg_chain(rctx->src, 2, sg);
751 
752 	if (req->src != req->dst) {
753 		sg_init_table(rctx->dst, 3);
754 		sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
755 		sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
756 		if (sg != rctx->dst + 1)
757 			sg_chain(rctx->dst, 2, sg);
758 	}
759 
760 	aead_request_set_tfm(subreq, child);
761 	aead_request_set_callback(subreq, req->base.flags, req->base.complete,
762 				  req->base.data);
763 	aead_request_set_crypt(subreq, rctx->src,
764 			       req->src == req->dst ? rctx->src : rctx->dst,
765 			       req->cryptlen, iv);
766 	aead_request_set_ad(subreq, req->assoclen - 8);
767 
768 	return subreq;
769 }
770 
771 static int crypto_rfc4106_encrypt(struct aead_request *req)
772 {
773 	int err;
774 
775 	err = crypto_ipsec_check_assoclen(req->assoclen);
776 	if (err)
777 		return err;
778 
779 	req = crypto_rfc4106_crypt(req);
780 
781 	return crypto_aead_encrypt(req);
782 }
783 
784 static int crypto_rfc4106_decrypt(struct aead_request *req)
785 {
786 	int err;
787 
788 	err = crypto_ipsec_check_assoclen(req->assoclen);
789 	if (err)
790 		return err;
791 
792 	req = crypto_rfc4106_crypt(req);
793 
794 	return crypto_aead_decrypt(req);
795 }
796 
797 static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
798 {
799 	struct aead_instance *inst = aead_alg_instance(tfm);
800 	struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
801 	struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
802 	struct crypto_aead *aead;
803 	unsigned long align;
804 
805 	aead = crypto_spawn_aead(spawn);
806 	if (IS_ERR(aead))
807 		return PTR_ERR(aead);
808 
809 	ctx->child = aead;
810 
811 	align = crypto_aead_alignmask(aead);
812 	align &= ~(crypto_tfm_ctx_alignment() - 1);
813 	crypto_aead_set_reqsize(
814 		tfm,
815 		sizeof(struct crypto_rfc4106_req_ctx) +
816 		ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
817 		align + 24);
818 
819 	return 0;
820 }
821 
822 static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
823 {
824 	struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
825 
826 	crypto_free_aead(ctx->child);
827 }
828 
829 static void crypto_rfc4106_free(struct aead_instance *inst)
830 {
831 	crypto_drop_aead(aead_instance_ctx(inst));
832 	kfree(inst);
833 }
834 
835 static int crypto_rfc4106_create(struct crypto_template *tmpl,
836 				 struct rtattr **tb)
837 {
838 	struct crypto_attr_type *algt;
839 	u32 mask;
840 	struct aead_instance *inst;
841 	struct crypto_aead_spawn *spawn;
842 	struct aead_alg *alg;
843 	const char *ccm_name;
844 	int err;
845 
846 	algt = crypto_get_attr_type(tb);
847 	if (IS_ERR(algt))
848 		return PTR_ERR(algt);
849 
850 	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
851 		return -EINVAL;
852 
853 	mask = crypto_requires_sync(algt->type, algt->mask);
854 
855 	ccm_name = crypto_attr_alg_name(tb[1]);
856 	if (IS_ERR(ccm_name))
857 		return PTR_ERR(ccm_name);
858 
859 	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
860 	if (!inst)
861 		return -ENOMEM;
862 
863 	spawn = aead_instance_ctx(inst);
864 	err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
865 			       ccm_name, 0, mask);
866 	if (err)
867 		goto out_free_inst;
868 
869 	alg = crypto_spawn_aead_alg(spawn);
870 
871 	err = -EINVAL;
872 
873 	/* Underlying IV size must be 12. */
874 	if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
875 		goto out_drop_alg;
876 
877 	/* Not a stream cipher? */
878 	if (alg->base.cra_blocksize != 1)
879 		goto out_drop_alg;
880 
881 	err = -ENAMETOOLONG;
882 	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
883 		     "rfc4106(%s)", alg->base.cra_name) >=
884 	    CRYPTO_MAX_ALG_NAME ||
885 	    snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
886 		     "rfc4106(%s)", alg->base.cra_driver_name) >=
887 	    CRYPTO_MAX_ALG_NAME)
888 		goto out_drop_alg;
889 
890 	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
891 	inst->alg.base.cra_priority = alg->base.cra_priority;
892 	inst->alg.base.cra_blocksize = 1;
893 	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
894 
895 	inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
896 
897 	inst->alg.ivsize = GCM_RFC4106_IV_SIZE;
898 	inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
899 	inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
900 
901 	inst->alg.init = crypto_rfc4106_init_tfm;
902 	inst->alg.exit = crypto_rfc4106_exit_tfm;
903 
904 	inst->alg.setkey = crypto_rfc4106_setkey;
905 	inst->alg.setauthsize = crypto_rfc4106_setauthsize;
906 	inst->alg.encrypt = crypto_rfc4106_encrypt;
907 	inst->alg.decrypt = crypto_rfc4106_decrypt;
908 
909 	inst->free = crypto_rfc4106_free;
910 
911 	err = aead_register_instance(tmpl, inst);
912 	if (err)
913 		goto out_drop_alg;
914 
915 out:
916 	return err;
917 
918 out_drop_alg:
919 	crypto_drop_aead(spawn);
920 out_free_inst:
921 	kfree(inst);
922 	goto out;
923 }
924 
925 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
926 				 unsigned int keylen)
927 {
928 	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
929 	struct crypto_aead *child = ctx->child;
930 
931 	if (keylen < 4)
932 		return -EINVAL;
933 
934 	keylen -= 4;
935 	memcpy(ctx->nonce, key + keylen, 4);
936 
937 	crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
938 	crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
939 				     CRYPTO_TFM_REQ_MASK);
940 	return crypto_aead_setkey(child, key, keylen);
941 }
942 
943 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
944 				      unsigned int authsize)
945 {
946 	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
947 
948 	if (authsize != 16)
949 		return -EINVAL;
950 
951 	return crypto_aead_setauthsize(ctx->child, authsize);
952 }
953 
954 static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
955 {
956 	struct crypto_aead *aead = crypto_aead_reqtfm(req);
957 	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
958 	struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
959 	struct aead_request *subreq = &rctx->subreq;
960 	unsigned int authsize = crypto_aead_authsize(aead);
961 	u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
962 			   crypto_aead_alignmask(ctx->child) + 1);
963 	int err;
964 
965 	if (req->src != req->dst) {
966 		err = crypto_rfc4543_copy_src_to_dst(req, enc);
967 		if (err)
968 			return err;
969 	}
970 
971 	memcpy(iv, ctx->nonce, 4);
972 	memcpy(iv + 4, req->iv, 8);
973 
974 	aead_request_set_tfm(subreq, ctx->child);
975 	aead_request_set_callback(subreq, req->base.flags,
976 				  req->base.complete, req->base.data);
977 	aead_request_set_crypt(subreq, req->src, req->dst,
978 			       enc ? 0 : authsize, iv);
979 	aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
980 				    subreq->cryptlen);
981 
982 	return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
983 }
984 
985 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
986 {
987 	struct crypto_aead *aead = crypto_aead_reqtfm(req);
988 	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
989 	unsigned int authsize = crypto_aead_authsize(aead);
990 	unsigned int nbytes = req->assoclen + req->cryptlen -
991 			      (enc ? 0 : authsize);
992 	SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
993 
994 	skcipher_request_set_sync_tfm(nreq, ctx->null);
995 	skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
996 	skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
997 
998 	return crypto_skcipher_encrypt(nreq);
999 }
1000 
1001 static int crypto_rfc4543_encrypt(struct aead_request *req)
1002 {
1003 	return crypto_ipsec_check_assoclen(req->assoclen) ?:
1004 	       crypto_rfc4543_crypt(req, true);
1005 }
1006 
1007 static int crypto_rfc4543_decrypt(struct aead_request *req)
1008 {
1009 	return crypto_ipsec_check_assoclen(req->assoclen) ?:
1010 	       crypto_rfc4543_crypt(req, false);
1011 }
1012 
1013 static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
1014 {
1015 	struct aead_instance *inst = aead_alg_instance(tfm);
1016 	struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
1017 	struct crypto_aead_spawn *spawn = &ictx->aead;
1018 	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1019 	struct crypto_aead *aead;
1020 	struct crypto_sync_skcipher *null;
1021 	unsigned long align;
1022 	int err = 0;
1023 
1024 	aead = crypto_spawn_aead(spawn);
1025 	if (IS_ERR(aead))
1026 		return PTR_ERR(aead);
1027 
1028 	null = crypto_get_default_null_skcipher();
1029 	err = PTR_ERR(null);
1030 	if (IS_ERR(null))
1031 		goto err_free_aead;
1032 
1033 	ctx->child = aead;
1034 	ctx->null = null;
1035 
1036 	align = crypto_aead_alignmask(aead);
1037 	align &= ~(crypto_tfm_ctx_alignment() - 1);
1038 	crypto_aead_set_reqsize(
1039 		tfm,
1040 		sizeof(struct crypto_rfc4543_req_ctx) +
1041 		ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1042 		align + GCM_AES_IV_SIZE);
1043 
1044 	return 0;
1045 
1046 err_free_aead:
1047 	crypto_free_aead(aead);
1048 	return err;
1049 }
1050 
1051 static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1052 {
1053 	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1054 
1055 	crypto_free_aead(ctx->child);
1056 	crypto_put_default_null_skcipher();
1057 }
1058 
1059 static void crypto_rfc4543_free(struct aead_instance *inst)
1060 {
1061 	struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1062 
1063 	crypto_drop_aead(&ctx->aead);
1064 
1065 	kfree(inst);
1066 }
1067 
1068 static int crypto_rfc4543_create(struct crypto_template *tmpl,
1069 				struct rtattr **tb)
1070 {
1071 	struct crypto_attr_type *algt;
1072 	u32 mask;
1073 	struct aead_instance *inst;
1074 	struct crypto_aead_spawn *spawn;
1075 	struct aead_alg *alg;
1076 	struct crypto_rfc4543_instance_ctx *ctx;
1077 	const char *ccm_name;
1078 	int err;
1079 
1080 	algt = crypto_get_attr_type(tb);
1081 	if (IS_ERR(algt))
1082 		return PTR_ERR(algt);
1083 
1084 	if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1085 		return -EINVAL;
1086 
1087 	mask = crypto_requires_sync(algt->type, algt->mask);
1088 
1089 	ccm_name = crypto_attr_alg_name(tb[1]);
1090 	if (IS_ERR(ccm_name))
1091 		return PTR_ERR(ccm_name);
1092 
1093 	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1094 	if (!inst)
1095 		return -ENOMEM;
1096 
1097 	ctx = aead_instance_ctx(inst);
1098 	spawn = &ctx->aead;
1099 	err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
1100 			       ccm_name, 0, mask);
1101 	if (err)
1102 		goto out_free_inst;
1103 
1104 	alg = crypto_spawn_aead_alg(spawn);
1105 
1106 	err = -EINVAL;
1107 
1108 	/* Underlying IV size must be 12. */
1109 	if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
1110 		goto out_drop_alg;
1111 
1112 	/* Not a stream cipher? */
1113 	if (alg->base.cra_blocksize != 1)
1114 		goto out_drop_alg;
1115 
1116 	err = -ENAMETOOLONG;
1117 	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1118 		     "rfc4543(%s)", alg->base.cra_name) >=
1119 	    CRYPTO_MAX_ALG_NAME ||
1120 	    snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1121 		     "rfc4543(%s)", alg->base.cra_driver_name) >=
1122 	    CRYPTO_MAX_ALG_NAME)
1123 		goto out_drop_alg;
1124 
1125 	inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1126 	inst->alg.base.cra_priority = alg->base.cra_priority;
1127 	inst->alg.base.cra_blocksize = 1;
1128 	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1129 
1130 	inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1131 
1132 	inst->alg.ivsize = GCM_RFC4543_IV_SIZE;
1133 	inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
1134 	inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1135 
1136 	inst->alg.init = crypto_rfc4543_init_tfm;
1137 	inst->alg.exit = crypto_rfc4543_exit_tfm;
1138 
1139 	inst->alg.setkey = crypto_rfc4543_setkey;
1140 	inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1141 	inst->alg.encrypt = crypto_rfc4543_encrypt;
1142 	inst->alg.decrypt = crypto_rfc4543_decrypt;
1143 
1144 	inst->free = crypto_rfc4543_free,
1145 
1146 	err = aead_register_instance(tmpl, inst);
1147 	if (err)
1148 		goto out_drop_alg;
1149 
1150 out:
1151 	return err;
1152 
1153 out_drop_alg:
1154 	crypto_drop_aead(spawn);
1155 out_free_inst:
1156 	kfree(inst);
1157 	goto out;
1158 }
1159 
1160 static struct crypto_template crypto_gcm_tmpls[] = {
1161 	{
1162 		.name = "gcm_base",
1163 		.create = crypto_gcm_base_create,
1164 		.module = THIS_MODULE,
1165 	}, {
1166 		.name = "gcm",
1167 		.create = crypto_gcm_create,
1168 		.module = THIS_MODULE,
1169 	}, {
1170 		.name = "rfc4106",
1171 		.create = crypto_rfc4106_create,
1172 		.module = THIS_MODULE,
1173 	}, {
1174 		.name = "rfc4543",
1175 		.create = crypto_rfc4543_create,
1176 		.module = THIS_MODULE,
1177 	},
1178 };
1179 
1180 static int __init crypto_gcm_module_init(void)
1181 {
1182 	int err;
1183 
1184 	gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1185 	if (!gcm_zeroes)
1186 		return -ENOMEM;
1187 
1188 	sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1189 
1190 	err = crypto_register_templates(crypto_gcm_tmpls,
1191 					ARRAY_SIZE(crypto_gcm_tmpls));
1192 	if (err)
1193 		kfree(gcm_zeroes);
1194 
1195 	return err;
1196 }
1197 
1198 static void __exit crypto_gcm_module_exit(void)
1199 {
1200 	kfree(gcm_zeroes);
1201 	crypto_unregister_templates(crypto_gcm_tmpls,
1202 				    ARRAY_SIZE(crypto_gcm_tmpls));
1203 }
1204 
1205 subsys_initcall(crypto_gcm_module_init);
1206 module_exit(crypto_gcm_module_exit);
1207 
1208 MODULE_LICENSE("GPL");
1209 MODULE_DESCRIPTION("Galois/Counter Mode");
1210 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1211 MODULE_ALIAS_CRYPTO("gcm_base");
1212 MODULE_ALIAS_CRYPTO("rfc4106");
1213 MODULE_ALIAS_CRYPTO("rfc4543");
1214 MODULE_ALIAS_CRYPTO("gcm");
1215