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 
crypto_gcm_reqctx(struct aead_request * req)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 
crypto_gcm_setkey(struct crypto_aead * aead,const u8 * key,unsigned int keylen)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 	kfree_sensitive(data);
143 	return err;
144 }
145 
crypto_gcm_setauthsize(struct crypto_aead * tfm,unsigned int authsize)146 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
147 				  unsigned int authsize)
148 {
149 	return crypto_gcm_check_authsize(authsize);
150 }
151 
crypto_gcm_init_common(struct aead_request * req)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 
crypto_gcm_init_crypt(struct aead_request * req,unsigned int cryptlen)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 
gcm_remain(unsigned int len)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 
gcm_hash_update(struct aead_request * req,crypto_completion_t compl,struct scatterlist * src,unsigned int len,u32 flags)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 
gcm_hash_remain(struct aead_request * req,unsigned int remain,crypto_completion_t compl,u32 flags)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 
gcm_hash_len(struct aead_request * req,u32 flags)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 
gcm_hash_len_continue(struct aead_request * req,u32 flags)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 
gcm_hash_len_done(struct crypto_async_request * areq,int err)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 
gcm_hash_crypt_remain_continue(struct aead_request * req,u32 flags)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 
gcm_hash_crypt_remain_done(struct crypto_async_request * areq,int err)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 
gcm_hash_crypt_continue(struct aead_request * req,u32 flags)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 
gcm_hash_crypt_done(struct crypto_async_request * areq,int err)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 
gcm_hash_assoc_remain_continue(struct aead_request * req,u32 flags)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 
gcm_hash_assoc_remain_done(struct crypto_async_request * areq,int err)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 
gcm_hash_assoc_continue(struct aead_request * req,u32 flags)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 
gcm_hash_assoc_done(struct crypto_async_request * areq,int err)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 
gcm_hash_init_continue(struct aead_request * req,u32 flags)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 
gcm_hash_init_done(struct crypto_async_request * areq,int err)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 
gcm_hash(struct aead_request * req,u32 flags)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 
gcm_enc_copy_hash(struct aead_request * req,u32 flags)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 
gcm_encrypt_continue(struct aead_request * req,u32 flags)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 
gcm_encrypt_done(struct crypto_async_request * areq,int err)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 
crypto_gcm_encrypt(struct aead_request * req)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 
crypto_gcm_verify(struct aead_request * req)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 
gcm_decrypt_done(struct crypto_async_request * areq,int err)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 
gcm_dec_hash_continue(struct aead_request * req,u32 flags)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 
crypto_gcm_decrypt(struct aead_request * req)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 
crypto_gcm_init_tfm(struct crypto_aead * tfm)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 
crypto_gcm_exit_tfm(struct crypto_aead * tfm)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 
crypto_gcm_free(struct aead_instance * inst)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 
crypto_gcm_create_common(struct crypto_template * tmpl,struct rtattr ** tb,const char * ctr_name,const char * ghash_name)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 	u32 mask;
582 	struct aead_instance *inst;
583 	struct gcm_instance_ctx *ctx;
584 	struct skcipher_alg *ctr;
585 	struct hash_alg_common *ghash;
586 	int err;
587 
588 	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
589 	if (err)
590 		return err;
591 
592 	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
593 	if (!inst)
594 		return -ENOMEM;
595 	ctx = aead_instance_ctx(inst);
596 
597 	err = crypto_grab_ahash(&ctx->ghash, aead_crypto_instance(inst),
598 				ghash_name, 0, mask);
599 	if (err)
600 		goto err_free_inst;
601 	ghash = crypto_spawn_ahash_alg(&ctx->ghash);
602 
603 	err = -EINVAL;
604 	if (strcmp(ghash->base.cra_name, "ghash") != 0 ||
605 	    ghash->digestsize != 16)
606 		goto err_free_inst;
607 
608 	err = crypto_grab_skcipher(&ctx->ctr, aead_crypto_instance(inst),
609 				   ctr_name, 0, mask);
610 	if (err)
611 		goto err_free_inst;
612 	ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
613 
614 	/* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
615 	err = -EINVAL;
616 	if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
617 	    crypto_skcipher_alg_ivsize(ctr) != 16 ||
618 	    ctr->base.cra_blocksize != 1)
619 		goto err_free_inst;
620 
621 	err = -ENAMETOOLONG;
622 	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
623 		     "gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
624 		goto err_free_inst;
625 
626 	if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
627 		     "gcm_base(%s,%s)", ctr->base.cra_driver_name,
628 		     ghash->base.cra_driver_name) >=
629 	    CRYPTO_MAX_ALG_NAME)
630 		goto err_free_inst;
631 
632 	inst->alg.base.cra_priority = (ghash->base.cra_priority +
633 				       ctr->base.cra_priority) / 2;
634 	inst->alg.base.cra_blocksize = 1;
635 	inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
636 				       ctr->base.cra_alignmask;
637 	inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
638 	inst->alg.ivsize = GCM_AES_IV_SIZE;
639 	inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
640 	inst->alg.maxauthsize = 16;
641 	inst->alg.init = crypto_gcm_init_tfm;
642 	inst->alg.exit = crypto_gcm_exit_tfm;
643 	inst->alg.setkey = crypto_gcm_setkey;
644 	inst->alg.setauthsize = crypto_gcm_setauthsize;
645 	inst->alg.encrypt = crypto_gcm_encrypt;
646 	inst->alg.decrypt = crypto_gcm_decrypt;
647 
648 	inst->free = crypto_gcm_free;
649 
650 	err = aead_register_instance(tmpl, inst);
651 	if (err) {
652 err_free_inst:
653 		crypto_gcm_free(inst);
654 	}
655 	return err;
656 }
657 
crypto_gcm_create(struct crypto_template * tmpl,struct rtattr ** tb)658 static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
659 {
660 	const char *cipher_name;
661 	char ctr_name[CRYPTO_MAX_ALG_NAME];
662 
663 	cipher_name = crypto_attr_alg_name(tb[1]);
664 	if (IS_ERR(cipher_name))
665 		return PTR_ERR(cipher_name);
666 
667 	if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
668 	    CRYPTO_MAX_ALG_NAME)
669 		return -ENAMETOOLONG;
670 
671 	return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash");
672 }
673 
crypto_gcm_base_create(struct crypto_template * tmpl,struct rtattr ** tb)674 static int crypto_gcm_base_create(struct crypto_template *tmpl,
675 				  struct rtattr **tb)
676 {
677 	const char *ctr_name;
678 	const char *ghash_name;
679 
680 	ctr_name = crypto_attr_alg_name(tb[1]);
681 	if (IS_ERR(ctr_name))
682 		return PTR_ERR(ctr_name);
683 
684 	ghash_name = crypto_attr_alg_name(tb[2]);
685 	if (IS_ERR(ghash_name))
686 		return PTR_ERR(ghash_name);
687 
688 	return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name);
689 }
690 
crypto_rfc4106_setkey(struct crypto_aead * parent,const u8 * key,unsigned int keylen)691 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
692 				 unsigned int keylen)
693 {
694 	struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
695 	struct crypto_aead *child = ctx->child;
696 
697 	if (keylen < 4)
698 		return -EINVAL;
699 
700 	keylen -= 4;
701 	memcpy(ctx->nonce, key + keylen, 4);
702 
703 	crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
704 	crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
705 				     CRYPTO_TFM_REQ_MASK);
706 	return crypto_aead_setkey(child, key, keylen);
707 }
708 
crypto_rfc4106_setauthsize(struct crypto_aead * parent,unsigned int authsize)709 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
710 				      unsigned int authsize)
711 {
712 	struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
713 	int err;
714 
715 	err = crypto_rfc4106_check_authsize(authsize);
716 	if (err)
717 		return err;
718 
719 	return crypto_aead_setauthsize(ctx->child, authsize);
720 }
721 
crypto_rfc4106_crypt(struct aead_request * req)722 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
723 {
724 	struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
725 	struct crypto_aead *aead = crypto_aead_reqtfm(req);
726 	struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
727 	struct aead_request *subreq = &rctx->subreq;
728 	struct crypto_aead *child = ctx->child;
729 	struct scatterlist *sg;
730 	u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
731 			   crypto_aead_alignmask(child) + 1);
732 
733 	scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
734 
735 	memcpy(iv, ctx->nonce, 4);
736 	memcpy(iv + 4, req->iv, 8);
737 
738 	sg_init_table(rctx->src, 3);
739 	sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
740 	sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
741 	if (sg != rctx->src + 1)
742 		sg_chain(rctx->src, 2, sg);
743 
744 	if (req->src != req->dst) {
745 		sg_init_table(rctx->dst, 3);
746 		sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
747 		sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
748 		if (sg != rctx->dst + 1)
749 			sg_chain(rctx->dst, 2, sg);
750 	}
751 
752 	aead_request_set_tfm(subreq, child);
753 	aead_request_set_callback(subreq, req->base.flags, req->base.complete,
754 				  req->base.data);
755 	aead_request_set_crypt(subreq, rctx->src,
756 			       req->src == req->dst ? rctx->src : rctx->dst,
757 			       req->cryptlen, iv);
758 	aead_request_set_ad(subreq, req->assoclen - 8);
759 
760 	return subreq;
761 }
762 
crypto_rfc4106_encrypt(struct aead_request * req)763 static int crypto_rfc4106_encrypt(struct aead_request *req)
764 {
765 	int err;
766 
767 	err = crypto_ipsec_check_assoclen(req->assoclen);
768 	if (err)
769 		return err;
770 
771 	req = crypto_rfc4106_crypt(req);
772 
773 	return crypto_aead_encrypt(req);
774 }
775 
crypto_rfc4106_decrypt(struct aead_request * req)776 static int crypto_rfc4106_decrypt(struct aead_request *req)
777 {
778 	int err;
779 
780 	err = crypto_ipsec_check_assoclen(req->assoclen);
781 	if (err)
782 		return err;
783 
784 	req = crypto_rfc4106_crypt(req);
785 
786 	return crypto_aead_decrypt(req);
787 }
788 
crypto_rfc4106_init_tfm(struct crypto_aead * tfm)789 static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
790 {
791 	struct aead_instance *inst = aead_alg_instance(tfm);
792 	struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
793 	struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
794 	struct crypto_aead *aead;
795 	unsigned long align;
796 
797 	aead = crypto_spawn_aead(spawn);
798 	if (IS_ERR(aead))
799 		return PTR_ERR(aead);
800 
801 	ctx->child = aead;
802 
803 	align = crypto_aead_alignmask(aead);
804 	align &= ~(crypto_tfm_ctx_alignment() - 1);
805 	crypto_aead_set_reqsize(
806 		tfm,
807 		sizeof(struct crypto_rfc4106_req_ctx) +
808 		ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
809 		align + 24);
810 
811 	return 0;
812 }
813 
crypto_rfc4106_exit_tfm(struct crypto_aead * tfm)814 static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
815 {
816 	struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
817 
818 	crypto_free_aead(ctx->child);
819 }
820 
crypto_rfc4106_free(struct aead_instance * inst)821 static void crypto_rfc4106_free(struct aead_instance *inst)
822 {
823 	crypto_drop_aead(aead_instance_ctx(inst));
824 	kfree(inst);
825 }
826 
crypto_rfc4106_create(struct crypto_template * tmpl,struct rtattr ** tb)827 static int crypto_rfc4106_create(struct crypto_template *tmpl,
828 				 struct rtattr **tb)
829 {
830 	u32 mask;
831 	struct aead_instance *inst;
832 	struct crypto_aead_spawn *spawn;
833 	struct aead_alg *alg;
834 	int err;
835 
836 	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
837 	if (err)
838 		return err;
839 
840 	inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
841 	if (!inst)
842 		return -ENOMEM;
843 
844 	spawn = aead_instance_ctx(inst);
845 	err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
846 			       crypto_attr_alg_name(tb[1]), 0, mask);
847 	if (err)
848 		goto err_free_inst;
849 
850 	alg = crypto_spawn_aead_alg(spawn);
851 
852 	err = -EINVAL;
853 
854 	/* Underlying IV size must be 12. */
855 	if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
856 		goto err_free_inst;
857 
858 	/* Not a stream cipher? */
859 	if (alg->base.cra_blocksize != 1)
860 		goto err_free_inst;
861 
862 	err = -ENAMETOOLONG;
863 	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
864 		     "rfc4106(%s)", alg->base.cra_name) >=
865 	    CRYPTO_MAX_ALG_NAME ||
866 	    snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
867 		     "rfc4106(%s)", alg->base.cra_driver_name) >=
868 	    CRYPTO_MAX_ALG_NAME)
869 		goto err_free_inst;
870 
871 	inst->alg.base.cra_priority = alg->base.cra_priority;
872 	inst->alg.base.cra_blocksize = 1;
873 	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
874 
875 	inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
876 
877 	inst->alg.ivsize = GCM_RFC4106_IV_SIZE;
878 	inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
879 	inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
880 
881 	inst->alg.init = crypto_rfc4106_init_tfm;
882 	inst->alg.exit = crypto_rfc4106_exit_tfm;
883 
884 	inst->alg.setkey = crypto_rfc4106_setkey;
885 	inst->alg.setauthsize = crypto_rfc4106_setauthsize;
886 	inst->alg.encrypt = crypto_rfc4106_encrypt;
887 	inst->alg.decrypt = crypto_rfc4106_decrypt;
888 
889 	inst->free = crypto_rfc4106_free;
890 
891 	err = aead_register_instance(tmpl, inst);
892 	if (err) {
893 err_free_inst:
894 		crypto_rfc4106_free(inst);
895 	}
896 	return err;
897 }
898 
crypto_rfc4543_setkey(struct crypto_aead * parent,const u8 * key,unsigned int keylen)899 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
900 				 unsigned int keylen)
901 {
902 	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
903 	struct crypto_aead *child = ctx->child;
904 
905 	if (keylen < 4)
906 		return -EINVAL;
907 
908 	keylen -= 4;
909 	memcpy(ctx->nonce, key + keylen, 4);
910 
911 	crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
912 	crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
913 				     CRYPTO_TFM_REQ_MASK);
914 	return crypto_aead_setkey(child, key, keylen);
915 }
916 
crypto_rfc4543_setauthsize(struct crypto_aead * parent,unsigned int authsize)917 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
918 				      unsigned int authsize)
919 {
920 	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
921 
922 	if (authsize != 16)
923 		return -EINVAL;
924 
925 	return crypto_aead_setauthsize(ctx->child, authsize);
926 }
927 
crypto_rfc4543_crypt(struct aead_request * req,bool enc)928 static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
929 {
930 	struct crypto_aead *aead = crypto_aead_reqtfm(req);
931 	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
932 	struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
933 	struct aead_request *subreq = &rctx->subreq;
934 	unsigned int authsize = crypto_aead_authsize(aead);
935 	u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
936 			   crypto_aead_alignmask(ctx->child) + 1);
937 	int err;
938 
939 	if (req->src != req->dst) {
940 		err = crypto_rfc4543_copy_src_to_dst(req, enc);
941 		if (err)
942 			return err;
943 	}
944 
945 	memcpy(iv, ctx->nonce, 4);
946 	memcpy(iv + 4, req->iv, 8);
947 
948 	aead_request_set_tfm(subreq, ctx->child);
949 	aead_request_set_callback(subreq, req->base.flags,
950 				  req->base.complete, req->base.data);
951 	aead_request_set_crypt(subreq, req->src, req->dst,
952 			       enc ? 0 : authsize, iv);
953 	aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
954 				    subreq->cryptlen);
955 
956 	return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
957 }
958 
crypto_rfc4543_copy_src_to_dst(struct aead_request * req,bool enc)959 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
960 {
961 	struct crypto_aead *aead = crypto_aead_reqtfm(req);
962 	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
963 	unsigned int authsize = crypto_aead_authsize(aead);
964 	unsigned int nbytes = req->assoclen + req->cryptlen -
965 			      (enc ? 0 : authsize);
966 	SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
967 
968 	skcipher_request_set_sync_tfm(nreq, ctx->null);
969 	skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
970 	skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
971 
972 	return crypto_skcipher_encrypt(nreq);
973 }
974 
crypto_rfc4543_encrypt(struct aead_request * req)975 static int crypto_rfc4543_encrypt(struct aead_request *req)
976 {
977 	return crypto_ipsec_check_assoclen(req->assoclen) ?:
978 	       crypto_rfc4543_crypt(req, true);
979 }
980 
crypto_rfc4543_decrypt(struct aead_request * req)981 static int crypto_rfc4543_decrypt(struct aead_request *req)
982 {
983 	return crypto_ipsec_check_assoclen(req->assoclen) ?:
984 	       crypto_rfc4543_crypt(req, false);
985 }
986 
crypto_rfc4543_init_tfm(struct crypto_aead * tfm)987 static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
988 {
989 	struct aead_instance *inst = aead_alg_instance(tfm);
990 	struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
991 	struct crypto_aead_spawn *spawn = &ictx->aead;
992 	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
993 	struct crypto_aead *aead;
994 	struct crypto_sync_skcipher *null;
995 	unsigned long align;
996 	int err = 0;
997 
998 	aead = crypto_spawn_aead(spawn);
999 	if (IS_ERR(aead))
1000 		return PTR_ERR(aead);
1001 
1002 	null = crypto_get_default_null_skcipher();
1003 	err = PTR_ERR(null);
1004 	if (IS_ERR(null))
1005 		goto err_free_aead;
1006 
1007 	ctx->child = aead;
1008 	ctx->null = null;
1009 
1010 	align = crypto_aead_alignmask(aead);
1011 	align &= ~(crypto_tfm_ctx_alignment() - 1);
1012 	crypto_aead_set_reqsize(
1013 		tfm,
1014 		sizeof(struct crypto_rfc4543_req_ctx) +
1015 		ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1016 		align + GCM_AES_IV_SIZE);
1017 
1018 	return 0;
1019 
1020 err_free_aead:
1021 	crypto_free_aead(aead);
1022 	return err;
1023 }
1024 
crypto_rfc4543_exit_tfm(struct crypto_aead * tfm)1025 static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1026 {
1027 	struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1028 
1029 	crypto_free_aead(ctx->child);
1030 	crypto_put_default_null_skcipher();
1031 }
1032 
crypto_rfc4543_free(struct aead_instance * inst)1033 static void crypto_rfc4543_free(struct aead_instance *inst)
1034 {
1035 	struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1036 
1037 	crypto_drop_aead(&ctx->aead);
1038 
1039 	kfree(inst);
1040 }
1041 
crypto_rfc4543_create(struct crypto_template * tmpl,struct rtattr ** tb)1042 static int crypto_rfc4543_create(struct crypto_template *tmpl,
1043 				struct rtattr **tb)
1044 {
1045 	u32 mask;
1046 	struct aead_instance *inst;
1047 	struct aead_alg *alg;
1048 	struct crypto_rfc4543_instance_ctx *ctx;
1049 	int err;
1050 
1051 	err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
1052 	if (err)
1053 		return err;
1054 
1055 	inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1056 	if (!inst)
1057 		return -ENOMEM;
1058 
1059 	ctx = aead_instance_ctx(inst);
1060 	err = crypto_grab_aead(&ctx->aead, aead_crypto_instance(inst),
1061 			       crypto_attr_alg_name(tb[1]), 0, mask);
1062 	if (err)
1063 		goto err_free_inst;
1064 
1065 	alg = crypto_spawn_aead_alg(&ctx->aead);
1066 
1067 	err = -EINVAL;
1068 
1069 	/* Underlying IV size must be 12. */
1070 	if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
1071 		goto err_free_inst;
1072 
1073 	/* Not a stream cipher? */
1074 	if (alg->base.cra_blocksize != 1)
1075 		goto err_free_inst;
1076 
1077 	err = -ENAMETOOLONG;
1078 	if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1079 		     "rfc4543(%s)", alg->base.cra_name) >=
1080 	    CRYPTO_MAX_ALG_NAME ||
1081 	    snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1082 		     "rfc4543(%s)", alg->base.cra_driver_name) >=
1083 	    CRYPTO_MAX_ALG_NAME)
1084 		goto err_free_inst;
1085 
1086 	inst->alg.base.cra_priority = alg->base.cra_priority;
1087 	inst->alg.base.cra_blocksize = 1;
1088 	inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1089 
1090 	inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1091 
1092 	inst->alg.ivsize = GCM_RFC4543_IV_SIZE;
1093 	inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
1094 	inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1095 
1096 	inst->alg.init = crypto_rfc4543_init_tfm;
1097 	inst->alg.exit = crypto_rfc4543_exit_tfm;
1098 
1099 	inst->alg.setkey = crypto_rfc4543_setkey;
1100 	inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1101 	inst->alg.encrypt = crypto_rfc4543_encrypt;
1102 	inst->alg.decrypt = crypto_rfc4543_decrypt;
1103 
1104 	inst->free = crypto_rfc4543_free;
1105 
1106 	err = aead_register_instance(tmpl, inst);
1107 	if (err) {
1108 err_free_inst:
1109 		crypto_rfc4543_free(inst);
1110 	}
1111 	return err;
1112 }
1113 
1114 static struct crypto_template crypto_gcm_tmpls[] = {
1115 	{
1116 		.name = "gcm_base",
1117 		.create = crypto_gcm_base_create,
1118 		.module = THIS_MODULE,
1119 	}, {
1120 		.name = "gcm",
1121 		.create = crypto_gcm_create,
1122 		.module = THIS_MODULE,
1123 	}, {
1124 		.name = "rfc4106",
1125 		.create = crypto_rfc4106_create,
1126 		.module = THIS_MODULE,
1127 	}, {
1128 		.name = "rfc4543",
1129 		.create = crypto_rfc4543_create,
1130 		.module = THIS_MODULE,
1131 	},
1132 };
1133 
crypto_gcm_module_init(void)1134 static int __init crypto_gcm_module_init(void)
1135 {
1136 	int err;
1137 
1138 	gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1139 	if (!gcm_zeroes)
1140 		return -ENOMEM;
1141 
1142 	sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1143 
1144 	err = crypto_register_templates(crypto_gcm_tmpls,
1145 					ARRAY_SIZE(crypto_gcm_tmpls));
1146 	if (err)
1147 		kfree(gcm_zeroes);
1148 
1149 	return err;
1150 }
1151 
crypto_gcm_module_exit(void)1152 static void __exit crypto_gcm_module_exit(void)
1153 {
1154 	kfree(gcm_zeroes);
1155 	crypto_unregister_templates(crypto_gcm_tmpls,
1156 				    ARRAY_SIZE(crypto_gcm_tmpls));
1157 }
1158 
1159 subsys_initcall(crypto_gcm_module_init);
1160 module_exit(crypto_gcm_module_exit);
1161 
1162 MODULE_LICENSE("GPL");
1163 MODULE_DESCRIPTION("Galois/Counter Mode");
1164 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1165 MODULE_ALIAS_CRYPTO("gcm_base");
1166 MODULE_ALIAS_CRYPTO("rfc4106");
1167 MODULE_ALIAS_CRYPTO("rfc4543");
1168 MODULE_ALIAS_CRYPTO("gcm");
1169