2 * GCM: Galois/Counter Mode.
4 * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License version 2 as published
8 * by the Free Software Foundation.
11 #include <crypto/gf128mul.h>
12 #include <crypto/internal/aead.h>
13 #include <crypto/internal/skcipher.h>
14 #include <crypto/internal/hash.h>
15 #include <crypto/null.h>
16 #include <crypto/scatterwalk.h>
17 #include <crypto/hash.h>
19 #include <linux/completion.h>
20 #include <linux/err.h>
21 #include <linux/init.h>
22 #include <linux/kernel.h>
23 #include <linux/module.h>
24 #include <linux/slab.h>
26 struct gcm_instance_ctx {
27 struct crypto_skcipher_spawn ctr;
28 struct crypto_ahash_spawn ghash;
31 struct crypto_gcm_ctx {
32 struct crypto_ablkcipher *ctr;
33 struct crypto_ahash *ghash;
36 struct crypto_rfc4106_ctx {
37 struct crypto_aead *child;
41 struct crypto_rfc4106_req_ctx {
42 struct scatterlist src[3];
43 struct scatterlist dst[3];
44 struct aead_request subreq;
47 struct crypto_rfc4543_instance_ctx {
48 struct crypto_aead_spawn aead;
51 struct crypto_rfc4543_ctx {
52 struct crypto_aead *child;
53 struct crypto_blkcipher *null;
57 struct crypto_rfc4543_req_ctx {
58 struct aead_request subreq;
61 struct crypto_gcm_ghash_ctx {
62 unsigned int cryptlen;
63 struct scatterlist *src;
64 int (*complete)(struct aead_request *req, u32 flags);
67 struct crypto_gcm_req_priv_ctx {
71 struct scatterlist src[3];
72 struct scatterlist dst[3];
73 struct scatterlist sg;
74 struct crypto_gcm_ghash_ctx ghash_ctx;
76 struct ahash_request ahreq;
77 struct ablkcipher_request abreq;
81 struct crypto_gcm_setkey_result {
83 struct completion completion;
88 struct scatterlist sg;
91 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
93 static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
94 struct aead_request *req)
96 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
98 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
101 static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
103 struct crypto_gcm_setkey_result *result = req->data;
105 if (err == -EINPROGRESS)
109 complete(&result->completion);
112 static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
115 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
116 struct crypto_ahash *ghash = ctx->ghash;
117 struct crypto_ablkcipher *ctr = ctx->ctr;
122 struct crypto_gcm_setkey_result result;
124 struct scatterlist sg[1];
125 struct ablkcipher_request req;
129 crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
130 crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
131 CRYPTO_TFM_REQ_MASK);
132 err = crypto_ablkcipher_setkey(ctr, key, keylen);
133 crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
134 CRYPTO_TFM_RES_MASK);
138 data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
143 init_completion(&data->result.completion);
144 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
145 ablkcipher_request_set_tfm(&data->req, ctr);
146 ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
147 CRYPTO_TFM_REQ_MAY_BACKLOG,
148 crypto_gcm_setkey_done,
150 ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
151 sizeof(data->hash), data->iv);
153 err = crypto_ablkcipher_encrypt(&data->req);
154 if (err == -EINPROGRESS || err == -EBUSY) {
155 wait_for_completion(&data->result.completion);
156 err = data->result.err;
162 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
163 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
164 CRYPTO_TFM_REQ_MASK);
165 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
166 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
167 CRYPTO_TFM_RES_MASK);
174 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
175 unsigned int authsize)
193 static void crypto_gcm_init_common(struct aead_request *req)
195 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
196 __be32 counter = cpu_to_be32(1);
197 struct scatterlist *sg;
199 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
200 memcpy(pctx->iv, req->iv, 12);
201 memcpy(pctx->iv + 12, &counter, 4);
203 sg_init_table(pctx->src, 3);
204 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
205 sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
206 if (sg != pctx->src + 1)
207 sg_chain(pctx->src, 2, sg);
209 if (req->src != req->dst) {
210 sg_init_table(pctx->dst, 3);
211 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
212 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
213 if (sg != pctx->dst + 1)
214 sg_chain(pctx->dst, 2, sg);
218 static void crypto_gcm_init_crypt(struct aead_request *req,
219 unsigned int cryptlen)
221 struct crypto_aead *aead = crypto_aead_reqtfm(req);
222 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
223 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
224 struct ablkcipher_request *ablk_req = &pctx->u.abreq;
225 struct scatterlist *dst;
227 dst = req->src == req->dst ? pctx->src : pctx->dst;
229 ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
230 ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
231 cryptlen + sizeof(pctx->auth_tag),
235 static inline unsigned int gcm_remain(unsigned int len)
238 return len ? 16 - len : 0;
241 static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
243 static int gcm_hash_update(struct aead_request *req,
244 crypto_completion_t compl,
245 struct scatterlist *src,
246 unsigned int len, u32 flags)
248 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
249 struct ahash_request *ahreq = &pctx->u.ahreq;
251 ahash_request_set_callback(ahreq, flags, compl, req);
252 ahash_request_set_crypt(ahreq, src, NULL, len);
254 return crypto_ahash_update(ahreq);
257 static int gcm_hash_remain(struct aead_request *req,
259 crypto_completion_t compl, u32 flags)
261 return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
264 static int gcm_hash_len(struct aead_request *req, u32 flags)
266 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
267 struct ahash_request *ahreq = &pctx->u.ahreq;
268 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
271 lengths.a = cpu_to_be64(req->assoclen * 8);
272 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
273 memcpy(pctx->iauth_tag, &lengths, 16);
274 sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
275 ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
276 ahash_request_set_crypt(ahreq, &pctx->sg,
277 pctx->iauth_tag, sizeof(lengths));
279 return crypto_ahash_finup(ahreq);
282 static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
284 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
285 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
287 return gctx->complete(req, flags);
290 static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
292 struct aead_request *req = areq->data;
297 err = gcm_hash_len_continue(req, 0);
298 if (err == -EINPROGRESS)
302 aead_request_complete(req, err);
305 static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
307 return gcm_hash_len(req, flags) ?:
308 gcm_hash_len_continue(req, flags);
311 static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
314 struct aead_request *req = areq->data;
319 err = gcm_hash_crypt_remain_continue(req, 0);
320 if (err == -EINPROGRESS)
324 aead_request_complete(req, err);
327 static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
329 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
330 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
333 remain = gcm_remain(gctx->cryptlen);
335 return gcm_hash_remain(req, remain,
336 gcm_hash_crypt_remain_done, flags) ?:
337 gcm_hash_crypt_remain_continue(req, flags);
339 return gcm_hash_crypt_remain_continue(req, flags);
342 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
344 struct aead_request *req = areq->data;
349 err = gcm_hash_crypt_continue(req, 0);
350 if (err == -EINPROGRESS)
354 aead_request_complete(req, err);
357 static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
359 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
360 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
363 return gcm_hash_update(req, gcm_hash_crypt_done,
364 gctx->src, gctx->cryptlen, flags) ?:
365 gcm_hash_crypt_continue(req, flags);
367 return gcm_hash_crypt_remain_continue(req, flags);
370 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
373 struct aead_request *req = areq->data;
378 err = gcm_hash_assoc_remain_continue(req, 0);
379 if (err == -EINPROGRESS)
383 aead_request_complete(req, err);
386 static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
390 remain = gcm_remain(req->assoclen);
392 return gcm_hash_remain(req, remain,
393 gcm_hash_assoc_remain_done, flags) ?:
394 gcm_hash_assoc_remain_continue(req, flags);
396 return gcm_hash_assoc_remain_continue(req, flags);
399 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
401 struct aead_request *req = areq->data;
406 err = gcm_hash_assoc_continue(req, 0);
407 if (err == -EINPROGRESS)
411 aead_request_complete(req, err);
414 static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
417 return gcm_hash_update(req, gcm_hash_assoc_done,
418 req->src, req->assoclen, flags) ?:
419 gcm_hash_assoc_continue(req, flags);
421 return gcm_hash_assoc_remain_continue(req, flags);
424 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
426 struct aead_request *req = areq->data;
431 err = gcm_hash_init_continue(req, 0);
432 if (err == -EINPROGRESS)
436 aead_request_complete(req, err);
439 static int gcm_hash(struct aead_request *req, u32 flags)
441 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
442 struct ahash_request *ahreq = &pctx->u.ahreq;
443 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
445 ahash_request_set_tfm(ahreq, ctx->ghash);
447 ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
448 return crypto_ahash_init(ahreq) ?:
449 gcm_hash_init_continue(req, flags);
452 static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
454 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
455 struct crypto_aead *aead = crypto_aead_reqtfm(req);
456 u8 *auth_tag = pctx->auth_tag;
458 crypto_xor(auth_tag, pctx->iauth_tag, 16);
459 scatterwalk_map_and_copy(auth_tag, req->dst,
460 req->assoclen + req->cryptlen,
461 crypto_aead_authsize(aead), 1);
465 static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
467 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
468 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
470 gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
471 gctx->cryptlen = req->cryptlen;
472 gctx->complete = gcm_enc_copy_hash;
474 return gcm_hash(req, flags);
477 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
479 struct aead_request *req = areq->data;
484 err = gcm_encrypt_continue(req, 0);
485 if (err == -EINPROGRESS)
489 aead_request_complete(req, err);
492 static int crypto_gcm_encrypt(struct aead_request *req)
494 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
495 struct ablkcipher_request *abreq = &pctx->u.abreq;
496 u32 flags = aead_request_flags(req);
498 crypto_gcm_init_common(req);
499 crypto_gcm_init_crypt(req, req->cryptlen);
500 ablkcipher_request_set_callback(abreq, flags, gcm_encrypt_done, req);
502 return crypto_ablkcipher_encrypt(abreq) ?:
503 gcm_encrypt_continue(req, flags);
506 static int crypto_gcm_verify(struct aead_request *req)
508 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
509 struct crypto_aead *aead = crypto_aead_reqtfm(req);
510 u8 *auth_tag = pctx->auth_tag;
511 u8 *iauth_tag = pctx->iauth_tag;
512 unsigned int authsize = crypto_aead_authsize(aead);
513 unsigned int cryptlen = req->cryptlen - authsize;
515 crypto_xor(auth_tag, iauth_tag, 16);
516 scatterwalk_map_and_copy(iauth_tag, req->src,
517 req->assoclen + cryptlen, authsize, 0);
518 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
521 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
523 struct aead_request *req = areq->data;
526 err = crypto_gcm_verify(req);
528 aead_request_complete(req, err);
531 static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
533 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
534 struct ablkcipher_request *abreq = &pctx->u.abreq;
535 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
537 crypto_gcm_init_crypt(req, gctx->cryptlen);
538 ablkcipher_request_set_callback(abreq, flags, gcm_decrypt_done, req);
539 return crypto_ablkcipher_decrypt(abreq) ?: crypto_gcm_verify(req);
542 static int crypto_gcm_decrypt(struct aead_request *req)
544 struct crypto_aead *aead = crypto_aead_reqtfm(req);
545 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
546 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
547 unsigned int authsize = crypto_aead_authsize(aead);
548 unsigned int cryptlen = req->cryptlen;
549 u32 flags = aead_request_flags(req);
551 cryptlen -= authsize;
553 crypto_gcm_init_common(req);
555 gctx->src = sg_next(pctx->src);
556 gctx->cryptlen = cryptlen;
557 gctx->complete = gcm_dec_hash_continue;
559 return gcm_hash(req, flags);
562 static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
564 struct aead_instance *inst = aead_alg_instance(tfm);
565 struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
566 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
567 struct crypto_ablkcipher *ctr;
568 struct crypto_ahash *ghash;
572 ghash = crypto_spawn_ahash(&ictx->ghash);
574 return PTR_ERR(ghash);
576 ctr = crypto_spawn_skcipher(&ictx->ctr);
584 align = crypto_aead_alignmask(tfm);
585 align &= ~(crypto_tfm_ctx_alignment() - 1);
586 crypto_aead_set_reqsize(tfm,
587 align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
588 max(sizeof(struct ablkcipher_request) +
589 crypto_ablkcipher_reqsize(ctr),
590 sizeof(struct ahash_request) +
591 crypto_ahash_reqsize(ghash)));
596 crypto_free_ahash(ghash);
600 static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
602 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
604 crypto_free_ahash(ctx->ghash);
605 crypto_free_ablkcipher(ctx->ctr);
608 static void crypto_gcm_free(struct aead_instance *inst)
610 struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
612 crypto_drop_skcipher(&ctx->ctr);
613 crypto_drop_ahash(&ctx->ghash);
617 static int crypto_gcm_create_common(struct crypto_template *tmpl,
619 const char *ctr_name,
620 const char *ghash_name)
622 struct crypto_attr_type *algt;
623 struct aead_instance *inst;
624 struct crypto_alg *ctr;
625 struct crypto_alg *ghash_alg;
626 struct hash_alg_common *ghash;
627 struct gcm_instance_ctx *ctx;
630 algt = crypto_get_attr_type(tb);
632 return PTR_ERR(algt);
634 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
637 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
638 CRYPTO_ALG_TYPE_HASH,
639 CRYPTO_ALG_TYPE_AHASH_MASK |
640 crypto_requires_sync(algt->type,
642 if (IS_ERR(ghash_alg))
643 return PTR_ERR(ghash_alg);
645 ghash = __crypto_hash_alg_common(ghash_alg);
648 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
652 ctx = aead_instance_ctx(inst);
653 err = crypto_init_ahash_spawn(&ctx->ghash, ghash,
654 aead_crypto_instance(inst));
659 if (strcmp(ghash->base.cra_name, "ghash") != 0 ||
660 ghash->digestsize != 16)
663 crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
664 err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
665 crypto_requires_sync(algt->type,
670 ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
672 /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
674 if (strncmp(ctr->cra_name, "ctr(", 4) != 0 ||
675 ctr->cra_ablkcipher.ivsize != 16 ||
676 ctr->cra_blocksize != 1)
680 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
681 "gcm(%s", ctr->cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
684 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
685 "gcm_base(%s,%s)", ctr->cra_driver_name,
686 ghash_alg->cra_driver_name) >=
690 inst->alg.base.cra_flags = (ghash->base.cra_flags | ctr->cra_flags) &
692 inst->alg.base.cra_priority = (ghash->base.cra_priority +
693 ctr->cra_priority) / 2;
694 inst->alg.base.cra_blocksize = 1;
695 inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
697 inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
698 inst->alg.ivsize = 12;
699 inst->alg.maxauthsize = 16;
700 inst->alg.init = crypto_gcm_init_tfm;
701 inst->alg.exit = crypto_gcm_exit_tfm;
702 inst->alg.setkey = crypto_gcm_setkey;
703 inst->alg.setauthsize = crypto_gcm_setauthsize;
704 inst->alg.encrypt = crypto_gcm_encrypt;
705 inst->alg.decrypt = crypto_gcm_decrypt;
707 inst->free = crypto_gcm_free;
709 err = aead_register_instance(tmpl, inst);
714 crypto_mod_put(ghash_alg);
718 crypto_drop_skcipher(&ctx->ctr);
720 crypto_drop_ahash(&ctx->ghash);
726 static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
728 const char *cipher_name;
729 char ctr_name[CRYPTO_MAX_ALG_NAME];
731 cipher_name = crypto_attr_alg_name(tb[1]);
732 if (IS_ERR(cipher_name))
733 return PTR_ERR(cipher_name);
735 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
737 return -ENAMETOOLONG;
739 return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash");
742 static struct crypto_template crypto_gcm_tmpl = {
744 .create = crypto_gcm_create,
745 .module = THIS_MODULE,
748 static int crypto_gcm_base_create(struct crypto_template *tmpl,
751 const char *ctr_name;
752 const char *ghash_name;
754 ctr_name = crypto_attr_alg_name(tb[1]);
755 if (IS_ERR(ctr_name))
756 return PTR_ERR(ctr_name);
758 ghash_name = crypto_attr_alg_name(tb[2]);
759 if (IS_ERR(ghash_name))
760 return PTR_ERR(ghash_name);
762 return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name);
765 static struct crypto_template crypto_gcm_base_tmpl = {
767 .create = crypto_gcm_base_create,
768 .module = THIS_MODULE,
771 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
774 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
775 struct crypto_aead *child = ctx->child;
782 memcpy(ctx->nonce, key + keylen, 4);
784 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
785 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
786 CRYPTO_TFM_REQ_MASK);
787 err = crypto_aead_setkey(child, key, keylen);
788 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
789 CRYPTO_TFM_RES_MASK);
794 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
795 unsigned int authsize)
797 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
808 return crypto_aead_setauthsize(ctx->child, authsize);
811 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
813 struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
814 struct crypto_aead *aead = crypto_aead_reqtfm(req);
815 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
816 struct aead_request *subreq = &rctx->subreq;
817 struct crypto_aead *child = ctx->child;
818 struct scatterlist *sg;
819 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
820 crypto_aead_alignmask(child) + 1);
822 scatterwalk_map_and_copy(iv + 12, req->src, 0, req->assoclen - 8, 0);
824 memcpy(iv, ctx->nonce, 4);
825 memcpy(iv + 4, req->iv, 8);
827 sg_init_table(rctx->src, 3);
828 sg_set_buf(rctx->src, iv + 12, req->assoclen - 8);
829 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
830 if (sg != rctx->src + 1)
831 sg_chain(rctx->src, 2, sg);
833 if (req->src != req->dst) {
834 sg_init_table(rctx->dst, 3);
835 sg_set_buf(rctx->dst, iv + 12, req->assoclen - 8);
836 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
837 if (sg != rctx->dst + 1)
838 sg_chain(rctx->dst, 2, sg);
841 aead_request_set_tfm(subreq, child);
842 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
844 aead_request_set_crypt(subreq, rctx->src,
845 req->src == req->dst ? rctx->src : rctx->dst,
847 aead_request_set_ad(subreq, req->assoclen - 8);
852 static int crypto_rfc4106_encrypt(struct aead_request *req)
854 if (req->assoclen != 16 && req->assoclen != 20)
857 req = crypto_rfc4106_crypt(req);
859 return crypto_aead_encrypt(req);
862 static int crypto_rfc4106_decrypt(struct aead_request *req)
864 if (req->assoclen != 16 && req->assoclen != 20)
867 req = crypto_rfc4106_crypt(req);
869 return crypto_aead_decrypt(req);
872 static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
874 struct aead_instance *inst = aead_alg_instance(tfm);
875 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
876 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
877 struct crypto_aead *aead;
880 aead = crypto_spawn_aead(spawn);
882 return PTR_ERR(aead);
886 align = crypto_aead_alignmask(aead);
887 align &= ~(crypto_tfm_ctx_alignment() - 1);
888 crypto_aead_set_reqsize(
890 sizeof(struct crypto_rfc4106_req_ctx) +
891 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
897 static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
899 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
901 crypto_free_aead(ctx->child);
904 static void crypto_rfc4106_free(struct aead_instance *inst)
906 crypto_drop_aead(aead_instance_ctx(inst));
910 static int crypto_rfc4106_create(struct crypto_template *tmpl,
913 struct crypto_attr_type *algt;
914 struct aead_instance *inst;
915 struct crypto_aead_spawn *spawn;
916 struct aead_alg *alg;
917 const char *ccm_name;
920 algt = crypto_get_attr_type(tb);
922 return PTR_ERR(algt);
924 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
927 ccm_name = crypto_attr_alg_name(tb[1]);
928 if (IS_ERR(ccm_name))
929 return PTR_ERR(ccm_name);
931 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
935 spawn = aead_instance_ctx(inst);
936 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
937 err = crypto_grab_aead(spawn, ccm_name, 0,
938 crypto_requires_sync(algt->type, algt->mask));
942 alg = crypto_spawn_aead_alg(spawn);
946 /* Underlying IV size must be 12. */
947 if (crypto_aead_alg_ivsize(alg) != 12)
950 /* Not a stream cipher? */
951 if (alg->base.cra_blocksize != 1)
955 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
956 "rfc4106(%s)", alg->base.cra_name) >=
957 CRYPTO_MAX_ALG_NAME ||
958 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
959 "rfc4106(%s)", alg->base.cra_driver_name) >=
963 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
964 inst->alg.base.cra_priority = alg->base.cra_priority;
965 inst->alg.base.cra_blocksize = 1;
966 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
968 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
970 inst->alg.ivsize = 8;
971 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
973 inst->alg.init = crypto_rfc4106_init_tfm;
974 inst->alg.exit = crypto_rfc4106_exit_tfm;
976 inst->alg.setkey = crypto_rfc4106_setkey;
977 inst->alg.setauthsize = crypto_rfc4106_setauthsize;
978 inst->alg.encrypt = crypto_rfc4106_encrypt;
979 inst->alg.decrypt = crypto_rfc4106_decrypt;
981 inst->free = crypto_rfc4106_free;
983 err = aead_register_instance(tmpl, inst);
991 crypto_drop_aead(spawn);
997 static struct crypto_template crypto_rfc4106_tmpl = {
999 .create = crypto_rfc4106_create,
1000 .module = THIS_MODULE,
1003 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1004 unsigned int keylen)
1006 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1007 struct crypto_aead *child = ctx->child;
1014 memcpy(ctx->nonce, key + keylen, 4);
1016 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1017 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1018 CRYPTO_TFM_REQ_MASK);
1019 err = crypto_aead_setkey(child, key, keylen);
1020 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1021 CRYPTO_TFM_RES_MASK);
1026 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1027 unsigned int authsize)
1029 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1034 return crypto_aead_setauthsize(ctx->child, authsize);
1037 static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
1039 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1040 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1041 struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
1042 struct aead_request *subreq = &rctx->subreq;
1043 unsigned int authsize = crypto_aead_authsize(aead);
1044 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1045 crypto_aead_alignmask(ctx->child) + 1);
1048 if (req->src != req->dst) {
1049 err = crypto_rfc4543_copy_src_to_dst(req, enc);
1054 memcpy(iv, ctx->nonce, 4);
1055 memcpy(iv + 4, req->iv, 8);
1057 aead_request_set_tfm(subreq, ctx->child);
1058 aead_request_set_callback(subreq, req->base.flags,
1059 req->base.complete, req->base.data);
1060 aead_request_set_crypt(subreq, req->src, req->dst,
1061 enc ? 0 : authsize, iv);
1062 aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
1065 return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
1068 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1070 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1071 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1072 unsigned int authsize = crypto_aead_authsize(aead);
1073 unsigned int nbytes = req->assoclen + req->cryptlen -
1074 (enc ? 0 : authsize);
1075 struct blkcipher_desc desc = {
1079 return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes);
1082 static int crypto_rfc4543_encrypt(struct aead_request *req)
1084 return crypto_rfc4543_crypt(req, true);
1087 static int crypto_rfc4543_decrypt(struct aead_request *req)
1089 return crypto_rfc4543_crypt(req, false);
1092 static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
1094 struct aead_instance *inst = aead_alg_instance(tfm);
1095 struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
1096 struct crypto_aead_spawn *spawn = &ictx->aead;
1097 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1098 struct crypto_aead *aead;
1099 struct crypto_blkcipher *null;
1100 unsigned long align;
1103 aead = crypto_spawn_aead(spawn);
1105 return PTR_ERR(aead);
1107 null = crypto_get_default_null_skcipher();
1108 err = PTR_ERR(null);
1115 align = crypto_aead_alignmask(aead);
1116 align &= ~(crypto_tfm_ctx_alignment() - 1);
1117 crypto_aead_set_reqsize(
1119 sizeof(struct crypto_rfc4543_req_ctx) +
1120 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1126 crypto_free_aead(aead);
1130 static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1132 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1134 crypto_free_aead(ctx->child);
1135 crypto_put_default_null_skcipher();
1138 static void crypto_rfc4543_free(struct aead_instance *inst)
1140 struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1142 crypto_drop_aead(&ctx->aead);
1147 static int crypto_rfc4543_create(struct crypto_template *tmpl,
1150 struct crypto_attr_type *algt;
1151 struct aead_instance *inst;
1152 struct crypto_aead_spawn *spawn;
1153 struct aead_alg *alg;
1154 struct crypto_rfc4543_instance_ctx *ctx;
1155 const char *ccm_name;
1158 algt = crypto_get_attr_type(tb);
1160 return PTR_ERR(algt);
1162 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1165 ccm_name = crypto_attr_alg_name(tb[1]);
1166 if (IS_ERR(ccm_name))
1167 return PTR_ERR(ccm_name);
1169 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1173 ctx = aead_instance_ctx(inst);
1175 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
1176 err = crypto_grab_aead(spawn, ccm_name, 0,
1177 crypto_requires_sync(algt->type, algt->mask));
1181 alg = crypto_spawn_aead_alg(spawn);
1185 /* Underlying IV size must be 12. */
1186 if (crypto_aead_alg_ivsize(alg) != 12)
1189 /* Not a stream cipher? */
1190 if (alg->base.cra_blocksize != 1)
1193 err = -ENAMETOOLONG;
1194 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1195 "rfc4543(%s)", alg->base.cra_name) >=
1196 CRYPTO_MAX_ALG_NAME ||
1197 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1198 "rfc4543(%s)", alg->base.cra_driver_name) >=
1199 CRYPTO_MAX_ALG_NAME)
1202 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1203 inst->alg.base.cra_priority = alg->base.cra_priority;
1204 inst->alg.base.cra_blocksize = 1;
1205 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1207 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1209 inst->alg.ivsize = 8;
1210 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1212 inst->alg.init = crypto_rfc4543_init_tfm;
1213 inst->alg.exit = crypto_rfc4543_exit_tfm;
1215 inst->alg.setkey = crypto_rfc4543_setkey;
1216 inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1217 inst->alg.encrypt = crypto_rfc4543_encrypt;
1218 inst->alg.decrypt = crypto_rfc4543_decrypt;
1220 inst->free = crypto_rfc4543_free,
1222 err = aead_register_instance(tmpl, inst);
1230 crypto_drop_aead(spawn);
1236 static struct crypto_template crypto_rfc4543_tmpl = {
1238 .create = crypto_rfc4543_create,
1239 .module = THIS_MODULE,
1242 static int __init crypto_gcm_module_init(void)
1246 gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1250 sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1252 err = crypto_register_template(&crypto_gcm_base_tmpl);
1256 err = crypto_register_template(&crypto_gcm_tmpl);
1260 err = crypto_register_template(&crypto_rfc4106_tmpl);
1264 err = crypto_register_template(&crypto_rfc4543_tmpl);
1266 goto out_undo_rfc4106;
1271 crypto_unregister_template(&crypto_rfc4106_tmpl);
1273 crypto_unregister_template(&crypto_gcm_tmpl);
1275 crypto_unregister_template(&crypto_gcm_base_tmpl);
1281 static void __exit crypto_gcm_module_exit(void)
1284 crypto_unregister_template(&crypto_rfc4543_tmpl);
1285 crypto_unregister_template(&crypto_rfc4106_tmpl);
1286 crypto_unregister_template(&crypto_gcm_tmpl);
1287 crypto_unregister_template(&crypto_gcm_base_tmpl);
1290 module_init(crypto_gcm_module_init);
1291 module_exit(crypto_gcm_module_exit);
1293 MODULE_LICENSE("GPL");
1294 MODULE_DESCRIPTION("Galois/Counter Mode");
1295 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1296 MODULE_ALIAS_CRYPTO("gcm_base");
1297 MODULE_ALIAS_CRYPTO("rfc4106");
1298 MODULE_ALIAS_CRYPTO("rfc4543");
1299 MODULE_ALIAS_CRYPTO("gcm");