1 // SPDX-License-Identifier: GPL-2.0-only
3 * GCM: Galois/Counter Mode.
5 * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
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>
22 struct gcm_instance_ctx {
23 struct crypto_skcipher_spawn ctr;
24 struct crypto_ahash_spawn ghash;
27 struct crypto_gcm_ctx {
28 struct crypto_skcipher *ctr;
29 struct crypto_ahash *ghash;
32 struct crypto_rfc4106_ctx {
33 struct crypto_aead *child;
37 struct crypto_rfc4106_req_ctx {
38 struct scatterlist src[3];
39 struct scatterlist dst[3];
40 struct aead_request subreq;
43 struct crypto_rfc4543_instance_ctx {
44 struct crypto_aead_spawn aead;
47 struct crypto_rfc4543_ctx {
48 struct crypto_aead *child;
49 struct crypto_sync_skcipher *null;
53 struct crypto_rfc4543_req_ctx {
54 struct aead_request subreq;
57 struct crypto_gcm_ghash_ctx {
58 unsigned int cryptlen;
59 struct scatterlist *src;
60 int (*complete)(struct aead_request *req, u32 flags);
63 struct crypto_gcm_req_priv_ctx {
67 struct scatterlist src[3];
68 struct scatterlist dst[3];
69 struct scatterlist sg;
70 struct crypto_gcm_ghash_ctx ghash_ctx;
72 struct ahash_request ahreq;
73 struct skcipher_request skreq;
79 struct scatterlist sg;
82 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
84 static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
85 struct aead_request *req)
87 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
89 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
92 static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
95 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
96 struct crypto_ahash *ghash = ctx->ghash;
97 struct crypto_skcipher *ctr = ctx->ctr;
102 struct crypto_wait wait;
104 struct scatterlist sg[1];
105 struct skcipher_request req;
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);
116 data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
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,
128 skcipher_request_set_crypt(&data->req, data->sg, data->sg,
129 sizeof(data->hash), data->iv);
131 err = crypto_wait_req(crypto_skcipher_encrypt(&data->req),
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));
142 kfree_sensitive(data);
146 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
147 unsigned int authsize)
149 return crypto_gcm_check_authsize(authsize);
152 static void crypto_gcm_init_common(struct aead_request *req)
154 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
155 __be32 counter = cpu_to_be32(1);
156 struct scatterlist *sg;
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);
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);
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);
177 static void crypto_gcm_init_crypt(struct aead_request *req,
178 unsigned int cryptlen)
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;
186 dst = req->src == req->dst ? pctx->src : pctx->dst;
188 skcipher_request_set_tfm(skreq, ctx->ctr);
189 skcipher_request_set_crypt(skreq, pctx->src, dst,
190 cryptlen + sizeof(pctx->auth_tag),
194 static inline unsigned int gcm_remain(unsigned int len)
197 return len ? 16 - len : 0;
200 static void gcm_hash_len_done(void *data, int err);
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)
207 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
208 struct ahash_request *ahreq = &pctx->u.ahreq;
210 ahash_request_set_callback(ahreq, flags, compl, req);
211 ahash_request_set_crypt(ahreq, src, NULL, len);
213 return crypto_ahash_update(ahreq);
216 static int gcm_hash_remain(struct aead_request *req,
218 crypto_completion_t compl, u32 flags)
220 return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
223 static int gcm_hash_len(struct aead_request *req, u32 flags)
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;
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));
238 return crypto_ahash_finup(ahreq);
241 static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
243 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
244 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
246 return gctx->complete(req, flags);
249 static void gcm_hash_len_done(void *data, int err)
251 struct aead_request *req = data;
256 err = gcm_hash_len_continue(req, 0);
257 if (err == -EINPROGRESS)
261 aead_request_complete(req, err);
264 static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
266 return gcm_hash_len(req, flags) ?:
267 gcm_hash_len_continue(req, flags);
270 static void gcm_hash_crypt_remain_done(void *data, int err)
272 struct aead_request *req = data;
277 err = gcm_hash_crypt_remain_continue(req, 0);
278 if (err == -EINPROGRESS)
282 aead_request_complete(req, err);
285 static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
287 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
288 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
291 remain = gcm_remain(gctx->cryptlen);
293 return gcm_hash_remain(req, remain,
294 gcm_hash_crypt_remain_done, flags) ?:
295 gcm_hash_crypt_remain_continue(req, flags);
297 return gcm_hash_crypt_remain_continue(req, flags);
300 static void gcm_hash_crypt_done(void *data, int err)
302 struct aead_request *req = data;
307 err = gcm_hash_crypt_continue(req, 0);
308 if (err == -EINPROGRESS)
312 aead_request_complete(req, err);
315 static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
317 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
318 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
321 return gcm_hash_update(req, gcm_hash_crypt_done,
322 gctx->src, gctx->cryptlen, flags) ?:
323 gcm_hash_crypt_continue(req, flags);
325 return gcm_hash_crypt_remain_continue(req, flags);
328 static void gcm_hash_assoc_remain_done(void *data, int err)
330 struct aead_request *req = data;
335 err = gcm_hash_assoc_remain_continue(req, 0);
336 if (err == -EINPROGRESS)
340 aead_request_complete(req, err);
343 static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
347 remain = gcm_remain(req->assoclen);
349 return gcm_hash_remain(req, remain,
350 gcm_hash_assoc_remain_done, flags) ?:
351 gcm_hash_assoc_remain_continue(req, flags);
353 return gcm_hash_assoc_remain_continue(req, flags);
356 static void gcm_hash_assoc_done(void *data, int err)
358 struct aead_request *req = data;
363 err = gcm_hash_assoc_continue(req, 0);
364 if (err == -EINPROGRESS)
368 aead_request_complete(req, err);
371 static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
374 return gcm_hash_update(req, gcm_hash_assoc_done,
375 req->src, req->assoclen, flags) ?:
376 gcm_hash_assoc_continue(req, flags);
378 return gcm_hash_assoc_remain_continue(req, flags);
381 static void gcm_hash_init_done(void *data, int err)
383 struct aead_request *req = data;
388 err = gcm_hash_init_continue(req, 0);
389 if (err == -EINPROGRESS)
393 aead_request_complete(req, err);
396 static int gcm_hash(struct aead_request *req, u32 flags)
398 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
399 struct ahash_request *ahreq = &pctx->u.ahreq;
400 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
402 ahash_request_set_tfm(ahreq, ctx->ghash);
404 ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
405 return crypto_ahash_init(ahreq) ?:
406 gcm_hash_init_continue(req, flags);
409 static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
411 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
412 struct crypto_aead *aead = crypto_aead_reqtfm(req);
413 u8 *auth_tag = pctx->auth_tag;
415 crypto_xor(auth_tag, pctx->iauth_tag, 16);
416 scatterwalk_map_and_copy(auth_tag, req->dst,
417 req->assoclen + req->cryptlen,
418 crypto_aead_authsize(aead), 1);
422 static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
424 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
425 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
427 gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
428 gctx->cryptlen = req->cryptlen;
429 gctx->complete = gcm_enc_copy_hash;
431 return gcm_hash(req, flags);
434 static void gcm_encrypt_done(void *data, int err)
436 struct aead_request *req = data;
441 err = gcm_encrypt_continue(req, 0);
442 if (err == -EINPROGRESS)
446 aead_request_complete(req, err);
449 static int crypto_gcm_encrypt(struct aead_request *req)
451 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
452 struct skcipher_request *skreq = &pctx->u.skreq;
453 u32 flags = aead_request_flags(req);
455 crypto_gcm_init_common(req);
456 crypto_gcm_init_crypt(req, req->cryptlen);
457 skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
459 return crypto_skcipher_encrypt(skreq) ?:
460 gcm_encrypt_continue(req, flags);
463 static int crypto_gcm_verify(struct aead_request *req)
465 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
466 struct crypto_aead *aead = crypto_aead_reqtfm(req);
467 u8 *auth_tag = pctx->auth_tag;
468 u8 *iauth_tag = pctx->iauth_tag;
469 unsigned int authsize = crypto_aead_authsize(aead);
470 unsigned int cryptlen = req->cryptlen - authsize;
472 crypto_xor(auth_tag, iauth_tag, 16);
473 scatterwalk_map_and_copy(iauth_tag, req->src,
474 req->assoclen + cryptlen, authsize, 0);
475 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
478 static void gcm_decrypt_done(void *data, int err)
480 struct aead_request *req = data;
483 err = crypto_gcm_verify(req);
485 aead_request_complete(req, err);
488 static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
490 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
491 struct skcipher_request *skreq = &pctx->u.skreq;
492 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
494 crypto_gcm_init_crypt(req, gctx->cryptlen);
495 skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
496 return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
499 static int crypto_gcm_decrypt(struct aead_request *req)
501 struct crypto_aead *aead = crypto_aead_reqtfm(req);
502 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
503 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
504 unsigned int authsize = crypto_aead_authsize(aead);
505 unsigned int cryptlen = req->cryptlen;
506 u32 flags = aead_request_flags(req);
508 cryptlen -= authsize;
510 crypto_gcm_init_common(req);
512 gctx->src = sg_next(pctx->src);
513 gctx->cryptlen = cryptlen;
514 gctx->complete = gcm_dec_hash_continue;
516 return gcm_hash(req, flags);
519 static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
521 struct aead_instance *inst = aead_alg_instance(tfm);
522 struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
523 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
524 struct crypto_skcipher *ctr;
525 struct crypto_ahash *ghash;
529 ghash = crypto_spawn_ahash(&ictx->ghash);
531 return PTR_ERR(ghash);
533 ctr = crypto_spawn_skcipher(&ictx->ctr);
541 align = crypto_aead_alignmask(tfm);
542 align &= ~(crypto_tfm_ctx_alignment() - 1);
543 crypto_aead_set_reqsize(tfm,
544 align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
545 max(sizeof(struct skcipher_request) +
546 crypto_skcipher_reqsize(ctr),
547 sizeof(struct ahash_request) +
548 crypto_ahash_reqsize(ghash)));
553 crypto_free_ahash(ghash);
557 static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
559 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
561 crypto_free_ahash(ctx->ghash);
562 crypto_free_skcipher(ctx->ctr);
565 static void crypto_gcm_free(struct aead_instance *inst)
567 struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
569 crypto_drop_skcipher(&ctx->ctr);
570 crypto_drop_ahash(&ctx->ghash);
574 static int crypto_gcm_create_common(struct crypto_template *tmpl,
576 const char *ctr_name,
577 const char *ghash_name)
579 struct skcipher_alg_common *ctr;
581 struct aead_instance *inst;
582 struct gcm_instance_ctx *ctx;
583 struct hash_alg_common *ghash;
586 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
590 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
593 ctx = aead_instance_ctx(inst);
595 err = crypto_grab_ahash(&ctx->ghash, aead_crypto_instance(inst),
596 ghash_name, 0, mask);
599 ghash = crypto_spawn_ahash_alg(&ctx->ghash);
602 if (strcmp(ghash->base.cra_name, "ghash") != 0 ||
603 ghash->digestsize != 16)
606 err = crypto_grab_skcipher(&ctx->ctr, aead_crypto_instance(inst),
610 ctr = crypto_spawn_skcipher_alg_common(&ctx->ctr);
612 /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
614 if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
615 ctr->ivsize != 16 || ctr->base.cra_blocksize != 1)
619 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
620 "gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
623 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
624 "gcm_base(%s,%s)", ctr->base.cra_driver_name,
625 ghash->base.cra_driver_name) >=
629 inst->alg.base.cra_priority = (ghash->base.cra_priority +
630 ctr->base.cra_priority) / 2;
631 inst->alg.base.cra_blocksize = 1;
632 inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
633 ctr->base.cra_alignmask;
634 inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
635 inst->alg.ivsize = GCM_AES_IV_SIZE;
636 inst->alg.chunksize = ctr->chunksize;
637 inst->alg.maxauthsize = 16;
638 inst->alg.init = crypto_gcm_init_tfm;
639 inst->alg.exit = crypto_gcm_exit_tfm;
640 inst->alg.setkey = crypto_gcm_setkey;
641 inst->alg.setauthsize = crypto_gcm_setauthsize;
642 inst->alg.encrypt = crypto_gcm_encrypt;
643 inst->alg.decrypt = crypto_gcm_decrypt;
645 inst->free = crypto_gcm_free;
647 err = aead_register_instance(tmpl, inst);
650 crypto_gcm_free(inst);
655 static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
657 const char *cipher_name;
658 char ctr_name[CRYPTO_MAX_ALG_NAME];
660 cipher_name = crypto_attr_alg_name(tb[1]);
661 if (IS_ERR(cipher_name))
662 return PTR_ERR(cipher_name);
664 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
666 return -ENAMETOOLONG;
668 return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash");
671 static int crypto_gcm_base_create(struct crypto_template *tmpl,
674 const char *ctr_name;
675 const char *ghash_name;
677 ctr_name = crypto_attr_alg_name(tb[1]);
678 if (IS_ERR(ctr_name))
679 return PTR_ERR(ctr_name);
681 ghash_name = crypto_attr_alg_name(tb[2]);
682 if (IS_ERR(ghash_name))
683 return PTR_ERR(ghash_name);
685 return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name);
688 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
691 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
692 struct crypto_aead *child = ctx->child;
698 memcpy(ctx->nonce, key + keylen, 4);
700 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
701 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
702 CRYPTO_TFM_REQ_MASK);
703 return crypto_aead_setkey(child, key, keylen);
706 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
707 unsigned int authsize)
709 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
712 err = crypto_rfc4106_check_authsize(authsize);
716 return crypto_aead_setauthsize(ctx->child, authsize);
719 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
721 struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
722 struct crypto_aead *aead = crypto_aead_reqtfm(req);
723 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
724 struct aead_request *subreq = &rctx->subreq;
725 struct crypto_aead *child = ctx->child;
726 struct scatterlist *sg;
727 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
728 crypto_aead_alignmask(child) + 1);
730 scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
732 memcpy(iv, ctx->nonce, 4);
733 memcpy(iv + 4, req->iv, 8);
735 sg_init_table(rctx->src, 3);
736 sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
737 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
738 if (sg != rctx->src + 1)
739 sg_chain(rctx->src, 2, sg);
741 if (req->src != req->dst) {
742 sg_init_table(rctx->dst, 3);
743 sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
744 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
745 if (sg != rctx->dst + 1)
746 sg_chain(rctx->dst, 2, sg);
749 aead_request_set_tfm(subreq, child);
750 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
752 aead_request_set_crypt(subreq, rctx->src,
753 req->src == req->dst ? rctx->src : rctx->dst,
755 aead_request_set_ad(subreq, req->assoclen - 8);
760 static int crypto_rfc4106_encrypt(struct aead_request *req)
764 err = crypto_ipsec_check_assoclen(req->assoclen);
768 req = crypto_rfc4106_crypt(req);
770 return crypto_aead_encrypt(req);
773 static int crypto_rfc4106_decrypt(struct aead_request *req)
777 err = crypto_ipsec_check_assoclen(req->assoclen);
781 req = crypto_rfc4106_crypt(req);
783 return crypto_aead_decrypt(req);
786 static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
788 struct aead_instance *inst = aead_alg_instance(tfm);
789 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
790 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
791 struct crypto_aead *aead;
794 aead = crypto_spawn_aead(spawn);
796 return PTR_ERR(aead);
800 align = crypto_aead_alignmask(aead);
801 align &= ~(crypto_tfm_ctx_alignment() - 1);
802 crypto_aead_set_reqsize(
804 sizeof(struct crypto_rfc4106_req_ctx) +
805 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
811 static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
813 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
815 crypto_free_aead(ctx->child);
818 static void crypto_rfc4106_free(struct aead_instance *inst)
820 crypto_drop_aead(aead_instance_ctx(inst));
824 static int crypto_rfc4106_create(struct crypto_template *tmpl,
828 struct aead_instance *inst;
829 struct crypto_aead_spawn *spawn;
830 struct aead_alg *alg;
833 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
837 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
841 spawn = aead_instance_ctx(inst);
842 err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
843 crypto_attr_alg_name(tb[1]), 0, mask);
847 alg = crypto_spawn_aead_alg(spawn);
851 /* Underlying IV size must be 12. */
852 if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
855 /* Not a stream cipher? */
856 if (alg->base.cra_blocksize != 1)
860 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
861 "rfc4106(%s)", alg->base.cra_name) >=
862 CRYPTO_MAX_ALG_NAME ||
863 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
864 "rfc4106(%s)", alg->base.cra_driver_name) >=
868 inst->alg.base.cra_priority = alg->base.cra_priority;
869 inst->alg.base.cra_blocksize = 1;
870 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
872 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
874 inst->alg.ivsize = GCM_RFC4106_IV_SIZE;
875 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
876 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
878 inst->alg.init = crypto_rfc4106_init_tfm;
879 inst->alg.exit = crypto_rfc4106_exit_tfm;
881 inst->alg.setkey = crypto_rfc4106_setkey;
882 inst->alg.setauthsize = crypto_rfc4106_setauthsize;
883 inst->alg.encrypt = crypto_rfc4106_encrypt;
884 inst->alg.decrypt = crypto_rfc4106_decrypt;
886 inst->free = crypto_rfc4106_free;
888 err = aead_register_instance(tmpl, inst);
891 crypto_rfc4106_free(inst);
896 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
899 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
900 struct crypto_aead *child = ctx->child;
906 memcpy(ctx->nonce, key + keylen, 4);
908 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
909 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
910 CRYPTO_TFM_REQ_MASK);
911 return crypto_aead_setkey(child, key, keylen);
914 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
915 unsigned int authsize)
917 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
922 return crypto_aead_setauthsize(ctx->child, authsize);
925 static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
927 struct crypto_aead *aead = crypto_aead_reqtfm(req);
928 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
929 struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
930 struct aead_request *subreq = &rctx->subreq;
931 unsigned int authsize = crypto_aead_authsize(aead);
932 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
933 crypto_aead_alignmask(ctx->child) + 1);
936 if (req->src != req->dst) {
937 err = crypto_rfc4543_copy_src_to_dst(req, enc);
942 memcpy(iv, ctx->nonce, 4);
943 memcpy(iv + 4, req->iv, 8);
945 aead_request_set_tfm(subreq, ctx->child);
946 aead_request_set_callback(subreq, req->base.flags,
947 req->base.complete, req->base.data);
948 aead_request_set_crypt(subreq, req->src, req->dst,
949 enc ? 0 : authsize, iv);
950 aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
953 return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
956 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
958 struct crypto_aead *aead = crypto_aead_reqtfm(req);
959 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
960 unsigned int authsize = crypto_aead_authsize(aead);
961 unsigned int nbytes = req->assoclen + req->cryptlen -
962 (enc ? 0 : authsize);
963 SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
965 skcipher_request_set_sync_tfm(nreq, ctx->null);
966 skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
967 skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
969 return crypto_skcipher_encrypt(nreq);
972 static int crypto_rfc4543_encrypt(struct aead_request *req)
974 return crypto_ipsec_check_assoclen(req->assoclen) ?:
975 crypto_rfc4543_crypt(req, true);
978 static int crypto_rfc4543_decrypt(struct aead_request *req)
980 return crypto_ipsec_check_assoclen(req->assoclen) ?:
981 crypto_rfc4543_crypt(req, false);
984 static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
986 struct aead_instance *inst = aead_alg_instance(tfm);
987 struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
988 struct crypto_aead_spawn *spawn = &ictx->aead;
989 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
990 struct crypto_aead *aead;
991 struct crypto_sync_skcipher *null;
995 aead = crypto_spawn_aead(spawn);
997 return PTR_ERR(aead);
999 null = crypto_get_default_null_skcipher();
1000 err = PTR_ERR(null);
1007 align = crypto_aead_alignmask(aead);
1008 align &= ~(crypto_tfm_ctx_alignment() - 1);
1009 crypto_aead_set_reqsize(
1011 sizeof(struct crypto_rfc4543_req_ctx) +
1012 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1013 align + GCM_AES_IV_SIZE);
1018 crypto_free_aead(aead);
1022 static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1024 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1026 crypto_free_aead(ctx->child);
1027 crypto_put_default_null_skcipher();
1030 static void crypto_rfc4543_free(struct aead_instance *inst)
1032 struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1034 crypto_drop_aead(&ctx->aead);
1039 static int crypto_rfc4543_create(struct crypto_template *tmpl,
1043 struct aead_instance *inst;
1044 struct aead_alg *alg;
1045 struct crypto_rfc4543_instance_ctx *ctx;
1048 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
1052 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1056 ctx = aead_instance_ctx(inst);
1057 err = crypto_grab_aead(&ctx->aead, aead_crypto_instance(inst),
1058 crypto_attr_alg_name(tb[1]), 0, mask);
1062 alg = crypto_spawn_aead_alg(&ctx->aead);
1066 /* Underlying IV size must be 12. */
1067 if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
1070 /* Not a stream cipher? */
1071 if (alg->base.cra_blocksize != 1)
1074 err = -ENAMETOOLONG;
1075 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1076 "rfc4543(%s)", alg->base.cra_name) >=
1077 CRYPTO_MAX_ALG_NAME ||
1078 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1079 "rfc4543(%s)", alg->base.cra_driver_name) >=
1080 CRYPTO_MAX_ALG_NAME)
1083 inst->alg.base.cra_priority = alg->base.cra_priority;
1084 inst->alg.base.cra_blocksize = 1;
1085 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1087 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1089 inst->alg.ivsize = GCM_RFC4543_IV_SIZE;
1090 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
1091 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1093 inst->alg.init = crypto_rfc4543_init_tfm;
1094 inst->alg.exit = crypto_rfc4543_exit_tfm;
1096 inst->alg.setkey = crypto_rfc4543_setkey;
1097 inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1098 inst->alg.encrypt = crypto_rfc4543_encrypt;
1099 inst->alg.decrypt = crypto_rfc4543_decrypt;
1101 inst->free = crypto_rfc4543_free;
1103 err = aead_register_instance(tmpl, inst);
1106 crypto_rfc4543_free(inst);
1111 static struct crypto_template crypto_gcm_tmpls[] = {
1114 .create = crypto_gcm_base_create,
1115 .module = THIS_MODULE,
1118 .create = crypto_gcm_create,
1119 .module = THIS_MODULE,
1122 .create = crypto_rfc4106_create,
1123 .module = THIS_MODULE,
1126 .create = crypto_rfc4543_create,
1127 .module = THIS_MODULE,
1131 static int __init crypto_gcm_module_init(void)
1135 gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1139 sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1141 err = crypto_register_templates(crypto_gcm_tmpls,
1142 ARRAY_SIZE(crypto_gcm_tmpls));
1149 static void __exit crypto_gcm_module_exit(void)
1152 crypto_unregister_templates(crypto_gcm_tmpls,
1153 ARRAY_SIZE(crypto_gcm_tmpls));
1156 subsys_initcall(crypto_gcm_module_init);
1157 module_exit(crypto_gcm_module_exit);
1159 MODULE_LICENSE("GPL");
1160 MODULE_DESCRIPTION("Galois/Counter Mode");
1161 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1162 MODULE_ALIAS_CRYPTO("gcm_base");
1163 MODULE_ALIAS_CRYPTO("rfc4106");
1164 MODULE_ALIAS_CRYPTO("rfc4543");
1165 MODULE_ALIAS_CRYPTO("gcm");