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));
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(struct crypto_async_request *areq, 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(struct crypto_async_request *areq, int err)
251 struct aead_request *req = areq->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(struct crypto_async_request *areq,
273 struct aead_request *req = areq->data;
278 err = gcm_hash_crypt_remain_continue(req, 0);
279 if (err == -EINPROGRESS)
283 aead_request_complete(req, err);
286 static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
288 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
289 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
292 remain = gcm_remain(gctx->cryptlen);
294 return gcm_hash_remain(req, remain,
295 gcm_hash_crypt_remain_done, flags) ?:
296 gcm_hash_crypt_remain_continue(req, flags);
298 return gcm_hash_crypt_remain_continue(req, flags);
301 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
303 struct aead_request *req = areq->data;
308 err = gcm_hash_crypt_continue(req, 0);
309 if (err == -EINPROGRESS)
313 aead_request_complete(req, err);
316 static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
318 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
319 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
322 return gcm_hash_update(req, gcm_hash_crypt_done,
323 gctx->src, gctx->cryptlen, flags) ?:
324 gcm_hash_crypt_continue(req, flags);
326 return gcm_hash_crypt_remain_continue(req, flags);
329 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
332 struct aead_request *req = areq->data;
337 err = gcm_hash_assoc_remain_continue(req, 0);
338 if (err == -EINPROGRESS)
342 aead_request_complete(req, err);
345 static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
349 remain = gcm_remain(req->assoclen);
351 return gcm_hash_remain(req, remain,
352 gcm_hash_assoc_remain_done, flags) ?:
353 gcm_hash_assoc_remain_continue(req, flags);
355 return gcm_hash_assoc_remain_continue(req, flags);
358 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
360 struct aead_request *req = areq->data;
365 err = gcm_hash_assoc_continue(req, 0);
366 if (err == -EINPROGRESS)
370 aead_request_complete(req, err);
373 static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
376 return gcm_hash_update(req, gcm_hash_assoc_done,
377 req->src, req->assoclen, flags) ?:
378 gcm_hash_assoc_continue(req, flags);
380 return gcm_hash_assoc_remain_continue(req, flags);
383 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
385 struct aead_request *req = areq->data;
390 err = gcm_hash_init_continue(req, 0);
391 if (err == -EINPROGRESS)
395 aead_request_complete(req, err);
398 static int gcm_hash(struct aead_request *req, u32 flags)
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));
404 ahash_request_set_tfm(ahreq, ctx->ghash);
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);
411 static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
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;
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);
424 static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
426 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
427 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
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;
433 return gcm_hash(req, flags);
436 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
438 struct aead_request *req = areq->data;
443 err = gcm_encrypt_continue(req, 0);
444 if (err == -EINPROGRESS)
448 aead_request_complete(req, err);
451 static int crypto_gcm_encrypt(struct aead_request *req)
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);
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);
461 return crypto_skcipher_encrypt(skreq) ?:
462 gcm_encrypt_continue(req, flags);
465 static int crypto_gcm_verify(struct aead_request *req)
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;
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;
480 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
482 struct aead_request *req = areq->data;
485 err = crypto_gcm_verify(req);
487 aead_request_complete(req, err);
490 static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
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;
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);
501 static int crypto_gcm_decrypt(struct aead_request *req)
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);
510 cryptlen -= authsize;
512 crypto_gcm_init_common(req);
514 gctx->src = sg_next(pctx->src);
515 gctx->cryptlen = cryptlen;
516 gctx->complete = gcm_dec_hash_continue;
518 return gcm_hash(req, flags);
521 static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
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;
531 ghash = crypto_spawn_ahash(&ictx->ghash);
533 return PTR_ERR(ghash);
535 ctr = crypto_spawn_skcipher(&ictx->ctr);
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)));
555 crypto_free_ahash(ghash);
559 static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
561 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
563 crypto_free_ahash(ctx->ghash);
564 crypto_free_skcipher(ctx->ctr);
567 static void crypto_gcm_free(struct aead_instance *inst)
569 struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
571 crypto_drop_skcipher(&ctx->ctr);
572 crypto_drop_ahash(&ctx->ghash);
576 static int crypto_gcm_create_common(struct crypto_template *tmpl,
578 const char *ctr_name,
579 const char *ghash_name)
581 struct crypto_attr_type *algt;
583 struct aead_instance *inst;
584 struct gcm_instance_ctx *ctx;
585 struct skcipher_alg *ctr;
586 struct hash_alg_common *ghash;
589 algt = crypto_get_attr_type(tb);
591 return PTR_ERR(algt);
593 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
596 mask = crypto_requires_sync(algt->type, algt->mask);
598 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
601 ctx = aead_instance_ctx(inst);
603 err = crypto_grab_ahash(&ctx->ghash, aead_crypto_instance(inst),
604 ghash_name, 0, mask);
607 ghash = crypto_spawn_ahash_alg(&ctx->ghash);
610 if (strcmp(ghash->base.cra_name, "ghash") != 0 ||
611 ghash->digestsize != 16)
614 err = crypto_grab_skcipher(&ctx->ctr, aead_crypto_instance(inst),
618 ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
620 /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
622 if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
623 crypto_skcipher_alg_ivsize(ctr) != 16 ||
624 ctr->base.cra_blocksize != 1)
628 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
629 "gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
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) >=
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;
656 inst->free = crypto_gcm_free;
658 err = aead_register_instance(tmpl, inst);
661 crypto_gcm_free(inst);
666 static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
668 const char *cipher_name;
669 char ctr_name[CRYPTO_MAX_ALG_NAME];
671 cipher_name = crypto_attr_alg_name(tb[1]);
672 if (IS_ERR(cipher_name))
673 return PTR_ERR(cipher_name);
675 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
677 return -ENAMETOOLONG;
679 return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash");
682 static int crypto_gcm_base_create(struct crypto_template *tmpl,
685 const char *ctr_name;
686 const char *ghash_name;
688 ctr_name = crypto_attr_alg_name(tb[1]);
689 if (IS_ERR(ctr_name))
690 return PTR_ERR(ctr_name);
692 ghash_name = crypto_attr_alg_name(tb[2]);
693 if (IS_ERR(ghash_name))
694 return PTR_ERR(ghash_name);
696 return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name);
699 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
702 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
703 struct crypto_aead *child = ctx->child;
709 memcpy(ctx->nonce, key + keylen, 4);
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);
717 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
718 unsigned int authsize)
720 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
723 err = crypto_rfc4106_check_authsize(authsize);
727 return crypto_aead_setauthsize(ctx->child, authsize);
730 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
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);
741 scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
743 memcpy(iv, ctx->nonce, 4);
744 memcpy(iv + 4, req->iv, 8);
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);
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);
760 aead_request_set_tfm(subreq, child);
761 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
763 aead_request_set_crypt(subreq, rctx->src,
764 req->src == req->dst ? rctx->src : rctx->dst,
766 aead_request_set_ad(subreq, req->assoclen - 8);
771 static int crypto_rfc4106_encrypt(struct aead_request *req)
775 err = crypto_ipsec_check_assoclen(req->assoclen);
779 req = crypto_rfc4106_crypt(req);
781 return crypto_aead_encrypt(req);
784 static int crypto_rfc4106_decrypt(struct aead_request *req)
788 err = crypto_ipsec_check_assoclen(req->assoclen);
792 req = crypto_rfc4106_crypt(req);
794 return crypto_aead_decrypt(req);
797 static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
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;
805 aead = crypto_spawn_aead(spawn);
807 return PTR_ERR(aead);
811 align = crypto_aead_alignmask(aead);
812 align &= ~(crypto_tfm_ctx_alignment() - 1);
813 crypto_aead_set_reqsize(
815 sizeof(struct crypto_rfc4106_req_ctx) +
816 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
822 static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
824 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
826 crypto_free_aead(ctx->child);
829 static void crypto_rfc4106_free(struct aead_instance *inst)
831 crypto_drop_aead(aead_instance_ctx(inst));
835 static int crypto_rfc4106_create(struct crypto_template *tmpl,
838 struct crypto_attr_type *algt;
840 struct aead_instance *inst;
841 struct crypto_aead_spawn *spawn;
842 struct aead_alg *alg;
843 const char *ccm_name;
846 algt = crypto_get_attr_type(tb);
848 return PTR_ERR(algt);
850 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
853 mask = crypto_requires_sync(algt->type, algt->mask);
855 ccm_name = crypto_attr_alg_name(tb[1]);
856 if (IS_ERR(ccm_name))
857 return PTR_ERR(ccm_name);
859 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
863 spawn = aead_instance_ctx(inst);
864 err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
869 alg = crypto_spawn_aead_alg(spawn);
873 /* Underlying IV size must be 12. */
874 if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
877 /* Not a stream cipher? */
878 if (alg->base.cra_blocksize != 1)
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) >=
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;
895 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
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);
901 inst->alg.init = crypto_rfc4106_init_tfm;
902 inst->alg.exit = crypto_rfc4106_exit_tfm;
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;
909 inst->free = crypto_rfc4106_free;
911 err = aead_register_instance(tmpl, inst);
919 crypto_drop_aead(spawn);
925 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
928 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
929 struct crypto_aead *child = ctx->child;
935 memcpy(ctx->nonce, key + keylen, 4);
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);
943 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
944 unsigned int authsize)
946 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
951 return crypto_aead_setauthsize(ctx->child, authsize);
954 static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
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);
965 if (req->src != req->dst) {
966 err = crypto_rfc4543_copy_src_to_dst(req, enc);
971 memcpy(iv, ctx->nonce, 4);
972 memcpy(iv + 4, req->iv, 8);
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 -
982 return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
985 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
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);
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);
998 return crypto_skcipher_encrypt(nreq);
1001 static int crypto_rfc4543_encrypt(struct aead_request *req)
1003 return crypto_ipsec_check_assoclen(req->assoclen) ?:
1004 crypto_rfc4543_crypt(req, true);
1007 static int crypto_rfc4543_decrypt(struct aead_request *req)
1009 return crypto_ipsec_check_assoclen(req->assoclen) ?:
1010 crypto_rfc4543_crypt(req, false);
1013 static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
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;
1024 aead = crypto_spawn_aead(spawn);
1026 return PTR_ERR(aead);
1028 null = crypto_get_default_null_skcipher();
1029 err = PTR_ERR(null);
1036 align = crypto_aead_alignmask(aead);
1037 align &= ~(crypto_tfm_ctx_alignment() - 1);
1038 crypto_aead_set_reqsize(
1040 sizeof(struct crypto_rfc4543_req_ctx) +
1041 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1042 align + GCM_AES_IV_SIZE);
1047 crypto_free_aead(aead);
1051 static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1053 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1055 crypto_free_aead(ctx->child);
1056 crypto_put_default_null_skcipher();
1059 static void crypto_rfc4543_free(struct aead_instance *inst)
1061 struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1063 crypto_drop_aead(&ctx->aead);
1068 static int crypto_rfc4543_create(struct crypto_template *tmpl,
1071 struct crypto_attr_type *algt;
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;
1080 algt = crypto_get_attr_type(tb);
1082 return PTR_ERR(algt);
1084 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1087 mask = crypto_requires_sync(algt->type, algt->mask);
1089 ccm_name = crypto_attr_alg_name(tb[1]);
1090 if (IS_ERR(ccm_name))
1091 return PTR_ERR(ccm_name);
1093 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1097 ctx = aead_instance_ctx(inst);
1099 err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
1104 alg = crypto_spawn_aead_alg(spawn);
1108 /* Underlying IV size must be 12. */
1109 if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
1112 /* Not a stream cipher? */
1113 if (alg->base.cra_blocksize != 1)
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)
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;
1130 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
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);
1136 inst->alg.init = crypto_rfc4543_init_tfm;
1137 inst->alg.exit = crypto_rfc4543_exit_tfm;
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;
1144 inst->free = crypto_rfc4543_free,
1146 err = aead_register_instance(tmpl, inst);
1154 crypto_drop_aead(spawn);
1160 static struct crypto_template crypto_gcm_tmpls[] = {
1163 .create = crypto_gcm_base_create,
1164 .module = THIS_MODULE,
1167 .create = crypto_gcm_create,
1168 .module = THIS_MODULE,
1171 .create = crypto_rfc4106_create,
1172 .module = THIS_MODULE,
1175 .create = crypto_rfc4543_create,
1176 .module = THIS_MODULE,
1180 static int __init crypto_gcm_module_init(void)
1184 gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1188 sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1190 err = crypto_register_templates(crypto_gcm_tmpls,
1191 ARRAY_SIZE(crypto_gcm_tmpls));
1198 static void __exit crypto_gcm_module_exit(void)
1201 crypto_unregister_templates(crypto_gcm_tmpls,
1202 ARRAY_SIZE(crypto_gcm_tmpls));
1205 subsys_initcall(crypto_gcm_module_init);
1206 module_exit(crypto_gcm_module_exit);
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");