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/gcm.h>
18 #include <crypto/hash.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_skcipher *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_skcipher *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 skcipher_request skreq;
83 struct scatterlist sg;
86 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
88 static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
89 struct aead_request *req)
91 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
93 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
96 static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
99 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
100 struct crypto_ahash *ghash = ctx->ghash;
101 struct crypto_skcipher *ctr = ctx->ctr;
106 struct crypto_wait wait;
108 struct scatterlist sg[1];
109 struct skcipher_request req;
113 crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
114 crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
115 CRYPTO_TFM_REQ_MASK);
116 err = crypto_skcipher_setkey(ctr, key, keylen);
117 crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
118 CRYPTO_TFM_RES_MASK);
122 data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
127 crypto_init_wait(&data->wait);
128 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
129 skcipher_request_set_tfm(&data->req, ctr);
130 skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
131 CRYPTO_TFM_REQ_MAY_BACKLOG,
134 skcipher_request_set_crypt(&data->req, data->sg, data->sg,
135 sizeof(data->hash), data->iv);
137 err = crypto_wait_req(crypto_skcipher_encrypt(&data->req),
143 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
144 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
145 CRYPTO_TFM_REQ_MASK);
146 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
147 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
148 CRYPTO_TFM_RES_MASK);
155 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
156 unsigned int authsize)
174 static void crypto_gcm_init_common(struct aead_request *req)
176 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
177 __be32 counter = cpu_to_be32(1);
178 struct scatterlist *sg;
180 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
181 memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE);
182 memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4);
184 sg_init_table(pctx->src, 3);
185 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
186 sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
187 if (sg != pctx->src + 1)
188 sg_chain(pctx->src, 2, sg);
190 if (req->src != req->dst) {
191 sg_init_table(pctx->dst, 3);
192 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
193 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
194 if (sg != pctx->dst + 1)
195 sg_chain(pctx->dst, 2, sg);
199 static void crypto_gcm_init_crypt(struct aead_request *req,
200 unsigned int cryptlen)
202 struct crypto_aead *aead = crypto_aead_reqtfm(req);
203 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
204 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
205 struct skcipher_request *skreq = &pctx->u.skreq;
206 struct scatterlist *dst;
208 dst = req->src == req->dst ? pctx->src : pctx->dst;
210 skcipher_request_set_tfm(skreq, ctx->ctr);
211 skcipher_request_set_crypt(skreq, pctx->src, dst,
212 cryptlen + sizeof(pctx->auth_tag),
216 static inline unsigned int gcm_remain(unsigned int len)
219 return len ? 16 - len : 0;
222 static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
224 static int gcm_hash_update(struct aead_request *req,
225 crypto_completion_t compl,
226 struct scatterlist *src,
227 unsigned int len, u32 flags)
229 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
230 struct ahash_request *ahreq = &pctx->u.ahreq;
232 ahash_request_set_callback(ahreq, flags, compl, req);
233 ahash_request_set_crypt(ahreq, src, NULL, len);
235 return crypto_ahash_update(ahreq);
238 static int gcm_hash_remain(struct aead_request *req,
240 crypto_completion_t compl, u32 flags)
242 return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
245 static int gcm_hash_len(struct aead_request *req, u32 flags)
247 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
248 struct ahash_request *ahreq = &pctx->u.ahreq;
249 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
252 lengths.a = cpu_to_be64(req->assoclen * 8);
253 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
254 memcpy(pctx->iauth_tag, &lengths, 16);
255 sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
256 ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
257 ahash_request_set_crypt(ahreq, &pctx->sg,
258 pctx->iauth_tag, sizeof(lengths));
260 return crypto_ahash_finup(ahreq);
263 static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
265 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
266 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
268 return gctx->complete(req, flags);
271 static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
273 struct aead_request *req = areq->data;
278 err = gcm_hash_len_continue(req, 0);
279 if (err == -EINPROGRESS)
283 aead_request_complete(req, err);
286 static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
288 return gcm_hash_len(req, flags) ?:
289 gcm_hash_len_continue(req, flags);
292 static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
295 struct aead_request *req = areq->data;
300 err = gcm_hash_crypt_remain_continue(req, 0);
301 if (err == -EINPROGRESS)
305 aead_request_complete(req, err);
308 static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
310 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
311 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
314 remain = gcm_remain(gctx->cryptlen);
316 return gcm_hash_remain(req, remain,
317 gcm_hash_crypt_remain_done, flags) ?:
318 gcm_hash_crypt_remain_continue(req, flags);
320 return gcm_hash_crypt_remain_continue(req, flags);
323 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
325 struct aead_request *req = areq->data;
330 err = gcm_hash_crypt_continue(req, 0);
331 if (err == -EINPROGRESS)
335 aead_request_complete(req, err);
338 static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
340 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
341 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
344 return gcm_hash_update(req, gcm_hash_crypt_done,
345 gctx->src, gctx->cryptlen, flags) ?:
346 gcm_hash_crypt_continue(req, flags);
348 return gcm_hash_crypt_remain_continue(req, flags);
351 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
354 struct aead_request *req = areq->data;
359 err = gcm_hash_assoc_remain_continue(req, 0);
360 if (err == -EINPROGRESS)
364 aead_request_complete(req, err);
367 static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
371 remain = gcm_remain(req->assoclen);
373 return gcm_hash_remain(req, remain,
374 gcm_hash_assoc_remain_done, flags) ?:
375 gcm_hash_assoc_remain_continue(req, flags);
377 return gcm_hash_assoc_remain_continue(req, flags);
380 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
382 struct aead_request *req = areq->data;
387 err = gcm_hash_assoc_continue(req, 0);
388 if (err == -EINPROGRESS)
392 aead_request_complete(req, err);
395 static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
398 return gcm_hash_update(req, gcm_hash_assoc_done,
399 req->src, req->assoclen, flags) ?:
400 gcm_hash_assoc_continue(req, flags);
402 return gcm_hash_assoc_remain_continue(req, flags);
405 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
407 struct aead_request *req = areq->data;
412 err = gcm_hash_init_continue(req, 0);
413 if (err == -EINPROGRESS)
417 aead_request_complete(req, err);
420 static int gcm_hash(struct aead_request *req, u32 flags)
422 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
423 struct ahash_request *ahreq = &pctx->u.ahreq;
424 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
426 ahash_request_set_tfm(ahreq, ctx->ghash);
428 ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
429 return crypto_ahash_init(ahreq) ?:
430 gcm_hash_init_continue(req, flags);
433 static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
435 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
436 struct crypto_aead *aead = crypto_aead_reqtfm(req);
437 u8 *auth_tag = pctx->auth_tag;
439 crypto_xor(auth_tag, pctx->iauth_tag, 16);
440 scatterwalk_map_and_copy(auth_tag, req->dst,
441 req->assoclen + req->cryptlen,
442 crypto_aead_authsize(aead), 1);
446 static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
448 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
449 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
451 gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
452 gctx->cryptlen = req->cryptlen;
453 gctx->complete = gcm_enc_copy_hash;
455 return gcm_hash(req, flags);
458 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
460 struct aead_request *req = areq->data;
465 err = gcm_encrypt_continue(req, 0);
466 if (err == -EINPROGRESS)
470 aead_request_complete(req, err);
473 static int crypto_gcm_encrypt(struct aead_request *req)
475 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
476 struct skcipher_request *skreq = &pctx->u.skreq;
477 u32 flags = aead_request_flags(req);
479 crypto_gcm_init_common(req);
480 crypto_gcm_init_crypt(req, req->cryptlen);
481 skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
483 return crypto_skcipher_encrypt(skreq) ?:
484 gcm_encrypt_continue(req, flags);
487 static int crypto_gcm_verify(struct aead_request *req)
489 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
490 struct crypto_aead *aead = crypto_aead_reqtfm(req);
491 u8 *auth_tag = pctx->auth_tag;
492 u8 *iauth_tag = pctx->iauth_tag;
493 unsigned int authsize = crypto_aead_authsize(aead);
494 unsigned int cryptlen = req->cryptlen - authsize;
496 crypto_xor(auth_tag, iauth_tag, 16);
497 scatterwalk_map_and_copy(iauth_tag, req->src,
498 req->assoclen + cryptlen, authsize, 0);
499 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
502 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
504 struct aead_request *req = areq->data;
507 err = crypto_gcm_verify(req);
509 aead_request_complete(req, err);
512 static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
514 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
515 struct skcipher_request *skreq = &pctx->u.skreq;
516 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
518 crypto_gcm_init_crypt(req, gctx->cryptlen);
519 skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
520 return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
523 static int crypto_gcm_decrypt(struct aead_request *req)
525 struct crypto_aead *aead = crypto_aead_reqtfm(req);
526 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
527 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
528 unsigned int authsize = crypto_aead_authsize(aead);
529 unsigned int cryptlen = req->cryptlen;
530 u32 flags = aead_request_flags(req);
532 cryptlen -= authsize;
534 crypto_gcm_init_common(req);
536 gctx->src = sg_next(pctx->src);
537 gctx->cryptlen = cryptlen;
538 gctx->complete = gcm_dec_hash_continue;
540 return gcm_hash(req, flags);
543 static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
545 struct aead_instance *inst = aead_alg_instance(tfm);
546 struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
547 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
548 struct crypto_skcipher *ctr;
549 struct crypto_ahash *ghash;
553 ghash = crypto_spawn_ahash(&ictx->ghash);
555 return PTR_ERR(ghash);
557 ctr = crypto_spawn_skcipher(&ictx->ctr);
565 align = crypto_aead_alignmask(tfm);
566 align &= ~(crypto_tfm_ctx_alignment() - 1);
567 crypto_aead_set_reqsize(tfm,
568 align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
569 max(sizeof(struct skcipher_request) +
570 crypto_skcipher_reqsize(ctr),
571 sizeof(struct ahash_request) +
572 crypto_ahash_reqsize(ghash)));
577 crypto_free_ahash(ghash);
581 static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
583 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
585 crypto_free_ahash(ctx->ghash);
586 crypto_free_skcipher(ctx->ctr);
589 static void crypto_gcm_free(struct aead_instance *inst)
591 struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
593 crypto_drop_skcipher(&ctx->ctr);
594 crypto_drop_ahash(&ctx->ghash);
598 static int crypto_gcm_create_common(struct crypto_template *tmpl,
600 const char *ctr_name,
601 const char *ghash_name)
603 struct crypto_attr_type *algt;
604 struct aead_instance *inst;
605 struct skcipher_alg *ctr;
606 struct crypto_alg *ghash_alg;
607 struct hash_alg_common *ghash;
608 struct gcm_instance_ctx *ctx;
611 algt = crypto_get_attr_type(tb);
613 return PTR_ERR(algt);
615 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
618 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
619 CRYPTO_ALG_TYPE_HASH,
620 CRYPTO_ALG_TYPE_AHASH_MASK |
621 crypto_requires_sync(algt->type,
623 if (IS_ERR(ghash_alg))
624 return PTR_ERR(ghash_alg);
626 ghash = __crypto_hash_alg_common(ghash_alg);
629 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
633 ctx = aead_instance_ctx(inst);
634 err = crypto_init_ahash_spawn(&ctx->ghash, ghash,
635 aead_crypto_instance(inst));
640 if (strcmp(ghash->base.cra_name, "ghash") != 0 ||
641 ghash->digestsize != 16)
644 crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
645 err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
646 crypto_requires_sync(algt->type,
651 ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
653 /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
655 if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
656 crypto_skcipher_alg_ivsize(ctr) != 16 ||
657 ctr->base.cra_blocksize != 1)
661 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
662 "gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
665 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
666 "gcm_base(%s,%s)", ctr->base.cra_driver_name,
667 ghash_alg->cra_driver_name) >=
671 inst->alg.base.cra_flags = (ghash->base.cra_flags |
672 ctr->base.cra_flags) & CRYPTO_ALG_ASYNC;
673 inst->alg.base.cra_priority = (ghash->base.cra_priority +
674 ctr->base.cra_priority) / 2;
675 inst->alg.base.cra_blocksize = 1;
676 inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
677 ctr->base.cra_alignmask;
678 inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
679 inst->alg.ivsize = GCM_AES_IV_SIZE;
680 inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
681 inst->alg.maxauthsize = 16;
682 inst->alg.init = crypto_gcm_init_tfm;
683 inst->alg.exit = crypto_gcm_exit_tfm;
684 inst->alg.setkey = crypto_gcm_setkey;
685 inst->alg.setauthsize = crypto_gcm_setauthsize;
686 inst->alg.encrypt = crypto_gcm_encrypt;
687 inst->alg.decrypt = crypto_gcm_decrypt;
689 inst->free = crypto_gcm_free;
691 err = aead_register_instance(tmpl, inst);
696 crypto_mod_put(ghash_alg);
700 crypto_drop_skcipher(&ctx->ctr);
702 crypto_drop_ahash(&ctx->ghash);
708 static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
710 const char *cipher_name;
711 char ctr_name[CRYPTO_MAX_ALG_NAME];
713 cipher_name = crypto_attr_alg_name(tb[1]);
714 if (IS_ERR(cipher_name))
715 return PTR_ERR(cipher_name);
717 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
719 return -ENAMETOOLONG;
721 return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash");
724 static struct crypto_template crypto_gcm_tmpl = {
726 .create = crypto_gcm_create,
727 .module = THIS_MODULE,
730 static int crypto_gcm_base_create(struct crypto_template *tmpl,
733 const char *ctr_name;
734 const char *ghash_name;
736 ctr_name = crypto_attr_alg_name(tb[1]);
737 if (IS_ERR(ctr_name))
738 return PTR_ERR(ctr_name);
740 ghash_name = crypto_attr_alg_name(tb[2]);
741 if (IS_ERR(ghash_name))
742 return PTR_ERR(ghash_name);
744 return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name);
747 static struct crypto_template crypto_gcm_base_tmpl = {
749 .create = crypto_gcm_base_create,
750 .module = THIS_MODULE,
753 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
756 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
757 struct crypto_aead *child = ctx->child;
764 memcpy(ctx->nonce, key + keylen, 4);
766 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
767 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
768 CRYPTO_TFM_REQ_MASK);
769 err = crypto_aead_setkey(child, key, keylen);
770 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
771 CRYPTO_TFM_RES_MASK);
776 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
777 unsigned int authsize)
779 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
790 return crypto_aead_setauthsize(ctx->child, authsize);
793 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
795 struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
796 struct crypto_aead *aead = crypto_aead_reqtfm(req);
797 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
798 struct aead_request *subreq = &rctx->subreq;
799 struct crypto_aead *child = ctx->child;
800 struct scatterlist *sg;
801 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
802 crypto_aead_alignmask(child) + 1);
804 scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
806 memcpy(iv, ctx->nonce, 4);
807 memcpy(iv + 4, req->iv, 8);
809 sg_init_table(rctx->src, 3);
810 sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
811 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
812 if (sg != rctx->src + 1)
813 sg_chain(rctx->src, 2, sg);
815 if (req->src != req->dst) {
816 sg_init_table(rctx->dst, 3);
817 sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
818 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
819 if (sg != rctx->dst + 1)
820 sg_chain(rctx->dst, 2, sg);
823 aead_request_set_tfm(subreq, child);
824 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
826 aead_request_set_crypt(subreq, rctx->src,
827 req->src == req->dst ? rctx->src : rctx->dst,
829 aead_request_set_ad(subreq, req->assoclen - 8);
834 static int crypto_rfc4106_encrypt(struct aead_request *req)
836 if (req->assoclen != 16 && req->assoclen != 20)
839 req = crypto_rfc4106_crypt(req);
841 return crypto_aead_encrypt(req);
844 static int crypto_rfc4106_decrypt(struct aead_request *req)
846 if (req->assoclen != 16 && req->assoclen != 20)
849 req = crypto_rfc4106_crypt(req);
851 return crypto_aead_decrypt(req);
854 static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
856 struct aead_instance *inst = aead_alg_instance(tfm);
857 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
858 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
859 struct crypto_aead *aead;
862 aead = crypto_spawn_aead(spawn);
864 return PTR_ERR(aead);
868 align = crypto_aead_alignmask(aead);
869 align &= ~(crypto_tfm_ctx_alignment() - 1);
870 crypto_aead_set_reqsize(
872 sizeof(struct crypto_rfc4106_req_ctx) +
873 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
879 static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
881 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
883 crypto_free_aead(ctx->child);
886 static void crypto_rfc4106_free(struct aead_instance *inst)
888 crypto_drop_aead(aead_instance_ctx(inst));
892 static int crypto_rfc4106_create(struct crypto_template *tmpl,
895 struct crypto_attr_type *algt;
896 struct aead_instance *inst;
897 struct crypto_aead_spawn *spawn;
898 struct aead_alg *alg;
899 const char *ccm_name;
902 algt = crypto_get_attr_type(tb);
904 return PTR_ERR(algt);
906 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
909 ccm_name = crypto_attr_alg_name(tb[1]);
910 if (IS_ERR(ccm_name))
911 return PTR_ERR(ccm_name);
913 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
917 spawn = aead_instance_ctx(inst);
918 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
919 err = crypto_grab_aead(spawn, ccm_name, 0,
920 crypto_requires_sync(algt->type, algt->mask));
924 alg = crypto_spawn_aead_alg(spawn);
928 /* Underlying IV size must be 12. */
929 if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
932 /* Not a stream cipher? */
933 if (alg->base.cra_blocksize != 1)
937 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
938 "rfc4106(%s)", alg->base.cra_name) >=
939 CRYPTO_MAX_ALG_NAME ||
940 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
941 "rfc4106(%s)", alg->base.cra_driver_name) >=
945 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
946 inst->alg.base.cra_priority = alg->base.cra_priority;
947 inst->alg.base.cra_blocksize = 1;
948 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
950 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
952 inst->alg.ivsize = GCM_RFC4106_IV_SIZE;
953 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
954 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
956 inst->alg.init = crypto_rfc4106_init_tfm;
957 inst->alg.exit = crypto_rfc4106_exit_tfm;
959 inst->alg.setkey = crypto_rfc4106_setkey;
960 inst->alg.setauthsize = crypto_rfc4106_setauthsize;
961 inst->alg.encrypt = crypto_rfc4106_encrypt;
962 inst->alg.decrypt = crypto_rfc4106_decrypt;
964 inst->free = crypto_rfc4106_free;
966 err = aead_register_instance(tmpl, inst);
974 crypto_drop_aead(spawn);
980 static struct crypto_template crypto_rfc4106_tmpl = {
982 .create = crypto_rfc4106_create,
983 .module = THIS_MODULE,
986 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
989 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
990 struct crypto_aead *child = ctx->child;
997 memcpy(ctx->nonce, key + keylen, 4);
999 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1000 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1001 CRYPTO_TFM_REQ_MASK);
1002 err = crypto_aead_setkey(child, key, keylen);
1003 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1004 CRYPTO_TFM_RES_MASK);
1009 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1010 unsigned int authsize)
1012 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1017 return crypto_aead_setauthsize(ctx->child, authsize);
1020 static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
1022 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1023 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1024 struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
1025 struct aead_request *subreq = &rctx->subreq;
1026 unsigned int authsize = crypto_aead_authsize(aead);
1027 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1028 crypto_aead_alignmask(ctx->child) + 1);
1031 if (req->src != req->dst) {
1032 err = crypto_rfc4543_copy_src_to_dst(req, enc);
1037 memcpy(iv, ctx->nonce, 4);
1038 memcpy(iv + 4, req->iv, 8);
1040 aead_request_set_tfm(subreq, ctx->child);
1041 aead_request_set_callback(subreq, req->base.flags,
1042 req->base.complete, req->base.data);
1043 aead_request_set_crypt(subreq, req->src, req->dst,
1044 enc ? 0 : authsize, iv);
1045 aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
1048 return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
1051 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1053 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1054 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1055 unsigned int authsize = crypto_aead_authsize(aead);
1056 unsigned int nbytes = req->assoclen + req->cryptlen -
1057 (enc ? 0 : authsize);
1058 SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
1060 skcipher_request_set_tfm(nreq, ctx->null);
1061 skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
1062 skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
1064 return crypto_skcipher_encrypt(nreq);
1067 static int crypto_rfc4543_encrypt(struct aead_request *req)
1069 return crypto_rfc4543_crypt(req, true);
1072 static int crypto_rfc4543_decrypt(struct aead_request *req)
1074 return crypto_rfc4543_crypt(req, false);
1077 static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
1079 struct aead_instance *inst = aead_alg_instance(tfm);
1080 struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
1081 struct crypto_aead_spawn *spawn = &ictx->aead;
1082 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1083 struct crypto_aead *aead;
1084 struct crypto_skcipher *null;
1085 unsigned long align;
1088 aead = crypto_spawn_aead(spawn);
1090 return PTR_ERR(aead);
1092 null = crypto_get_default_null_skcipher();
1093 err = PTR_ERR(null);
1100 align = crypto_aead_alignmask(aead);
1101 align &= ~(crypto_tfm_ctx_alignment() - 1);
1102 crypto_aead_set_reqsize(
1104 sizeof(struct crypto_rfc4543_req_ctx) +
1105 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1106 align + GCM_AES_IV_SIZE);
1111 crypto_free_aead(aead);
1115 static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1117 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1119 crypto_free_aead(ctx->child);
1120 crypto_put_default_null_skcipher();
1123 static void crypto_rfc4543_free(struct aead_instance *inst)
1125 struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1127 crypto_drop_aead(&ctx->aead);
1132 static int crypto_rfc4543_create(struct crypto_template *tmpl,
1135 struct crypto_attr_type *algt;
1136 struct aead_instance *inst;
1137 struct crypto_aead_spawn *spawn;
1138 struct aead_alg *alg;
1139 struct crypto_rfc4543_instance_ctx *ctx;
1140 const char *ccm_name;
1143 algt = crypto_get_attr_type(tb);
1145 return PTR_ERR(algt);
1147 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1150 ccm_name = crypto_attr_alg_name(tb[1]);
1151 if (IS_ERR(ccm_name))
1152 return PTR_ERR(ccm_name);
1154 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1158 ctx = aead_instance_ctx(inst);
1160 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
1161 err = crypto_grab_aead(spawn, ccm_name, 0,
1162 crypto_requires_sync(algt->type, algt->mask));
1166 alg = crypto_spawn_aead_alg(spawn);
1170 /* Underlying IV size must be 12. */
1171 if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
1174 /* Not a stream cipher? */
1175 if (alg->base.cra_blocksize != 1)
1178 err = -ENAMETOOLONG;
1179 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1180 "rfc4543(%s)", alg->base.cra_name) >=
1181 CRYPTO_MAX_ALG_NAME ||
1182 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1183 "rfc4543(%s)", alg->base.cra_driver_name) >=
1184 CRYPTO_MAX_ALG_NAME)
1187 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1188 inst->alg.base.cra_priority = alg->base.cra_priority;
1189 inst->alg.base.cra_blocksize = 1;
1190 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1192 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1194 inst->alg.ivsize = GCM_RFC4543_IV_SIZE;
1195 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
1196 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1198 inst->alg.init = crypto_rfc4543_init_tfm;
1199 inst->alg.exit = crypto_rfc4543_exit_tfm;
1201 inst->alg.setkey = crypto_rfc4543_setkey;
1202 inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1203 inst->alg.encrypt = crypto_rfc4543_encrypt;
1204 inst->alg.decrypt = crypto_rfc4543_decrypt;
1206 inst->free = crypto_rfc4543_free,
1208 err = aead_register_instance(tmpl, inst);
1216 crypto_drop_aead(spawn);
1222 static struct crypto_template crypto_rfc4543_tmpl = {
1224 .create = crypto_rfc4543_create,
1225 .module = THIS_MODULE,
1228 static int __init crypto_gcm_module_init(void)
1232 gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1236 sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1238 err = crypto_register_template(&crypto_gcm_base_tmpl);
1242 err = crypto_register_template(&crypto_gcm_tmpl);
1246 err = crypto_register_template(&crypto_rfc4106_tmpl);
1250 err = crypto_register_template(&crypto_rfc4543_tmpl);
1252 goto out_undo_rfc4106;
1257 crypto_unregister_template(&crypto_rfc4106_tmpl);
1259 crypto_unregister_template(&crypto_gcm_tmpl);
1261 crypto_unregister_template(&crypto_gcm_base_tmpl);
1267 static void __exit crypto_gcm_module_exit(void)
1270 crypto_unregister_template(&crypto_rfc4543_tmpl);
1271 crypto_unregister_template(&crypto_rfc4106_tmpl);
1272 crypto_unregister_template(&crypto_gcm_tmpl);
1273 crypto_unregister_template(&crypto_gcm_base_tmpl);
1276 module_init(crypto_gcm_module_init);
1277 module_exit(crypto_gcm_module_exit);
1279 MODULE_LICENSE("GPL");
1280 MODULE_DESCRIPTION("Galois/Counter Mode");
1281 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1282 MODULE_ALIAS_CRYPTO("gcm_base");
1283 MODULE_ALIAS_CRYPTO("rfc4106");
1284 MODULE_ALIAS_CRYPTO("rfc4543");
1285 MODULE_ALIAS_CRYPTO("gcm");