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 err = wait_for_completion_interruptible(
156 &data->result.completion);
158 err = data->result.err;
164 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
165 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
166 CRYPTO_TFM_REQ_MASK);
167 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
168 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
169 CRYPTO_TFM_RES_MASK);
176 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
177 unsigned int authsize)
195 static void crypto_gcm_init_common(struct aead_request *req)
197 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
198 __be32 counter = cpu_to_be32(1);
199 struct scatterlist *sg;
201 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
202 memcpy(pctx->iv, req->iv, 12);
203 memcpy(pctx->iv + 12, &counter, 4);
205 sg_init_table(pctx->src, 3);
206 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
207 sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
208 if (sg != pctx->src + 1)
209 sg_chain(pctx->src, 2, sg);
211 if (req->src != req->dst) {
212 sg_init_table(pctx->dst, 3);
213 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
214 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
215 if (sg != pctx->dst + 1)
216 sg_chain(pctx->dst, 2, sg);
220 static void crypto_gcm_init_crypt(struct aead_request *req,
221 unsigned int cryptlen)
223 struct crypto_aead *aead = crypto_aead_reqtfm(req);
224 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
225 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
226 struct ablkcipher_request *ablk_req = &pctx->u.abreq;
227 struct scatterlist *dst;
229 dst = req->src == req->dst ? pctx->src : pctx->dst;
231 ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
232 ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
233 cryptlen + sizeof(pctx->auth_tag),
237 static inline unsigned int gcm_remain(unsigned int len)
240 return len ? 16 - len : 0;
243 static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
245 static int gcm_hash_update(struct aead_request *req,
246 crypto_completion_t compl,
247 struct scatterlist *src,
248 unsigned int len, u32 flags)
250 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
251 struct ahash_request *ahreq = &pctx->u.ahreq;
253 ahash_request_set_callback(ahreq, flags, compl, req);
254 ahash_request_set_crypt(ahreq, src, NULL, len);
256 return crypto_ahash_update(ahreq);
259 static int gcm_hash_remain(struct aead_request *req,
261 crypto_completion_t compl, u32 flags)
263 return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
266 static int gcm_hash_len(struct aead_request *req, u32 flags)
268 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
269 struct ahash_request *ahreq = &pctx->u.ahreq;
270 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
273 lengths.a = cpu_to_be64(req->assoclen * 8);
274 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
275 memcpy(pctx->iauth_tag, &lengths, 16);
276 sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
277 ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
278 ahash_request_set_crypt(ahreq, &pctx->sg,
279 pctx->iauth_tag, sizeof(lengths));
281 return crypto_ahash_finup(ahreq);
284 static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
286 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
287 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
289 return gctx->complete(req, flags);
292 static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
294 struct aead_request *req = areq->data;
299 err = gcm_hash_len_continue(req, 0);
300 if (err == -EINPROGRESS)
304 aead_request_complete(req, err);
307 static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
309 return gcm_hash_len(req, flags) ?:
310 gcm_hash_len_continue(req, flags);
313 static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
316 struct aead_request *req = areq->data;
321 err = gcm_hash_crypt_remain_continue(req, 0);
322 if (err == -EINPROGRESS)
326 aead_request_complete(req, err);
329 static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
331 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
332 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
335 remain = gcm_remain(gctx->cryptlen);
337 return gcm_hash_remain(req, remain,
338 gcm_hash_crypt_remain_done, flags) ?:
339 gcm_hash_crypt_remain_continue(req, flags);
341 return gcm_hash_crypt_remain_continue(req, flags);
344 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
346 struct aead_request *req = areq->data;
351 err = gcm_hash_crypt_continue(req, 0);
352 if (err == -EINPROGRESS)
356 aead_request_complete(req, err);
359 static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
361 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
362 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
365 return gcm_hash_update(req, gcm_hash_crypt_done,
366 gctx->src, gctx->cryptlen, flags) ?:
367 gcm_hash_crypt_continue(req, flags);
369 return gcm_hash_crypt_remain_continue(req, flags);
372 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
375 struct aead_request *req = areq->data;
380 err = gcm_hash_assoc_remain_continue(req, 0);
381 if (err == -EINPROGRESS)
385 aead_request_complete(req, err);
388 static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
392 remain = gcm_remain(req->assoclen);
394 return gcm_hash_remain(req, remain,
395 gcm_hash_assoc_remain_done, flags) ?:
396 gcm_hash_assoc_remain_continue(req, flags);
398 return gcm_hash_assoc_remain_continue(req, flags);
401 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
403 struct aead_request *req = areq->data;
408 err = gcm_hash_assoc_continue(req, 0);
409 if (err == -EINPROGRESS)
413 aead_request_complete(req, err);
416 static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
419 return gcm_hash_update(req, gcm_hash_assoc_done,
420 req->src, req->assoclen, flags) ?:
421 gcm_hash_assoc_continue(req, flags);
423 return gcm_hash_assoc_remain_continue(req, flags);
426 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
428 struct aead_request *req = areq->data;
433 err = gcm_hash_init_continue(req, 0);
434 if (err == -EINPROGRESS)
438 aead_request_complete(req, err);
441 static int gcm_hash(struct aead_request *req, u32 flags)
443 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
444 struct ahash_request *ahreq = &pctx->u.ahreq;
445 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
447 ahash_request_set_tfm(ahreq, ctx->ghash);
449 ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
450 return crypto_ahash_init(ahreq) ?:
451 gcm_hash_init_continue(req, flags);
454 static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
456 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
457 struct crypto_aead *aead = crypto_aead_reqtfm(req);
458 u8 *auth_tag = pctx->auth_tag;
460 crypto_xor(auth_tag, pctx->iauth_tag, 16);
461 scatterwalk_map_and_copy(auth_tag, req->dst,
462 req->assoclen + req->cryptlen,
463 crypto_aead_authsize(aead), 1);
467 static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
469 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
470 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
472 gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
473 gctx->cryptlen = req->cryptlen;
474 gctx->complete = gcm_enc_copy_hash;
476 return gcm_hash(req, flags);
479 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
481 struct aead_request *req = areq->data;
486 err = gcm_encrypt_continue(req, 0);
487 if (err == -EINPROGRESS)
491 aead_request_complete(req, err);
494 static int crypto_gcm_encrypt(struct aead_request *req)
496 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
497 struct ablkcipher_request *abreq = &pctx->u.abreq;
498 u32 flags = aead_request_flags(req);
500 crypto_gcm_init_common(req);
501 crypto_gcm_init_crypt(req, req->cryptlen);
502 ablkcipher_request_set_callback(abreq, flags, gcm_encrypt_done, req);
504 return crypto_ablkcipher_encrypt(abreq) ?:
505 gcm_encrypt_continue(req, flags);
508 static int crypto_gcm_verify(struct aead_request *req)
510 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
511 struct crypto_aead *aead = crypto_aead_reqtfm(req);
512 u8 *auth_tag = pctx->auth_tag;
513 u8 *iauth_tag = pctx->iauth_tag;
514 unsigned int authsize = crypto_aead_authsize(aead);
515 unsigned int cryptlen = req->cryptlen - authsize;
517 crypto_xor(auth_tag, iauth_tag, 16);
518 scatterwalk_map_and_copy(iauth_tag, req->src,
519 req->assoclen + cryptlen, authsize, 0);
520 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
523 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
525 struct aead_request *req = areq->data;
528 err = crypto_gcm_verify(req);
530 aead_request_complete(req, err);
533 static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
535 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
536 struct ablkcipher_request *abreq = &pctx->u.abreq;
537 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
539 crypto_gcm_init_crypt(req, gctx->cryptlen);
540 ablkcipher_request_set_callback(abreq, flags, gcm_decrypt_done, req);
541 return crypto_ablkcipher_decrypt(abreq) ?: crypto_gcm_verify(req);
544 static int crypto_gcm_decrypt(struct aead_request *req)
546 struct crypto_aead *aead = crypto_aead_reqtfm(req);
547 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
548 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
549 unsigned int authsize = crypto_aead_authsize(aead);
550 unsigned int cryptlen = req->cryptlen;
551 u32 flags = aead_request_flags(req);
553 cryptlen -= authsize;
555 crypto_gcm_init_common(req);
557 gctx->src = sg_next(pctx->src);
558 gctx->cryptlen = cryptlen;
559 gctx->complete = gcm_dec_hash_continue;
561 return gcm_hash(req, flags);
564 static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
566 struct aead_instance *inst = aead_alg_instance(tfm);
567 struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
568 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
569 struct crypto_ablkcipher *ctr;
570 struct crypto_ahash *ghash;
574 ghash = crypto_spawn_ahash(&ictx->ghash);
576 return PTR_ERR(ghash);
578 ctr = crypto_spawn_skcipher(&ictx->ctr);
586 align = crypto_aead_alignmask(tfm);
587 align &= ~(crypto_tfm_ctx_alignment() - 1);
588 crypto_aead_set_reqsize(tfm,
589 align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
590 max(sizeof(struct ablkcipher_request) +
591 crypto_ablkcipher_reqsize(ctr),
592 sizeof(struct ahash_request) +
593 crypto_ahash_reqsize(ghash)));
598 crypto_free_ahash(ghash);
602 static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
604 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
606 crypto_free_ahash(ctx->ghash);
607 crypto_free_ablkcipher(ctx->ctr);
610 static void crypto_gcm_free(struct aead_instance *inst)
612 struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
614 crypto_drop_skcipher(&ctx->ctr);
615 crypto_drop_ahash(&ctx->ghash);
619 static int crypto_gcm_create_common(struct crypto_template *tmpl,
621 const char *full_name,
622 const char *ctr_name,
623 const char *ghash_name)
625 struct crypto_attr_type *algt;
626 struct aead_instance *inst;
627 struct crypto_alg *ctr;
628 struct crypto_alg *ghash_alg;
629 struct hash_alg_common *ghash;
630 struct gcm_instance_ctx *ctx;
633 algt = crypto_get_attr_type(tb);
635 return PTR_ERR(algt);
637 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
640 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
641 CRYPTO_ALG_TYPE_HASH,
642 CRYPTO_ALG_TYPE_AHASH_MASK);
643 if (IS_ERR(ghash_alg))
644 return PTR_ERR(ghash_alg);
646 ghash = __crypto_hash_alg_common(ghash_alg);
649 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
653 ctx = aead_instance_ctx(inst);
654 err = crypto_init_ahash_spawn(&ctx->ghash, ghash,
655 aead_crypto_instance(inst));
660 if (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 /* We only support 16-byte blocks. */
673 if (ctr->cra_ablkcipher.ivsize != 16)
676 /* Not a stream cipher? */
678 if (ctr->cra_blocksize != 1)
682 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
683 "gcm_base(%s,%s)", ctr->cra_driver_name,
684 ghash_alg->cra_driver_name) >=
688 memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_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];
730 char full_name[CRYPTO_MAX_ALG_NAME];
732 cipher_name = crypto_attr_alg_name(tb[1]);
733 if (IS_ERR(cipher_name))
734 return PTR_ERR(cipher_name);
736 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
738 return -ENAMETOOLONG;
740 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
742 return -ENAMETOOLONG;
744 return crypto_gcm_create_common(tmpl, tb, full_name,
748 static struct crypto_template crypto_gcm_tmpl = {
750 .create = crypto_gcm_create,
751 .module = THIS_MODULE,
754 static int crypto_gcm_base_create(struct crypto_template *tmpl,
757 const char *ctr_name;
758 const char *ghash_name;
759 char full_name[CRYPTO_MAX_ALG_NAME];
761 ctr_name = crypto_attr_alg_name(tb[1]);
762 if (IS_ERR(ctr_name))
763 return PTR_ERR(ctr_name);
765 ghash_name = crypto_attr_alg_name(tb[2]);
766 if (IS_ERR(ghash_name))
767 return PTR_ERR(ghash_name);
769 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
770 ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
771 return -ENAMETOOLONG;
773 return crypto_gcm_create_common(tmpl, tb, full_name,
774 ctr_name, ghash_name);
777 static struct crypto_template crypto_gcm_base_tmpl = {
779 .create = crypto_gcm_base_create,
780 .module = THIS_MODULE,
783 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
786 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
787 struct crypto_aead *child = ctx->child;
794 memcpy(ctx->nonce, key + keylen, 4);
796 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
797 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
798 CRYPTO_TFM_REQ_MASK);
799 err = crypto_aead_setkey(child, key, keylen);
800 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
801 CRYPTO_TFM_RES_MASK);
806 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
807 unsigned int authsize)
809 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
820 return crypto_aead_setauthsize(ctx->child, authsize);
823 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
825 struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
826 struct crypto_aead *aead = crypto_aead_reqtfm(req);
827 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
828 struct aead_request *subreq = &rctx->subreq;
829 struct crypto_aead *child = ctx->child;
830 struct scatterlist *sg;
831 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
832 crypto_aead_alignmask(child) + 1);
834 scatterwalk_map_and_copy(iv + 12, req->src, 0, req->assoclen - 8, 0);
836 memcpy(iv, ctx->nonce, 4);
837 memcpy(iv + 4, req->iv, 8);
839 sg_init_table(rctx->src, 3);
840 sg_set_buf(rctx->src, iv + 12, req->assoclen - 8);
841 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
842 if (sg != rctx->src + 1)
843 sg_chain(rctx->src, 2, sg);
845 if (req->src != req->dst) {
846 sg_init_table(rctx->dst, 3);
847 sg_set_buf(rctx->dst, iv + 12, req->assoclen - 8);
848 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
849 if (sg != rctx->dst + 1)
850 sg_chain(rctx->dst, 2, sg);
853 aead_request_set_tfm(subreq, child);
854 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
856 aead_request_set_crypt(subreq, rctx->src,
857 req->src == req->dst ? rctx->src : rctx->dst,
859 aead_request_set_ad(subreq, req->assoclen - 8);
864 static int crypto_rfc4106_encrypt(struct aead_request *req)
866 if (req->assoclen != 16 && req->assoclen != 20)
869 req = crypto_rfc4106_crypt(req);
871 return crypto_aead_encrypt(req);
874 static int crypto_rfc4106_decrypt(struct aead_request *req)
876 if (req->assoclen != 16 && req->assoclen != 20)
879 req = crypto_rfc4106_crypt(req);
881 return crypto_aead_decrypt(req);
884 static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
886 struct aead_instance *inst = aead_alg_instance(tfm);
887 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
888 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
889 struct crypto_aead *aead;
892 aead = crypto_spawn_aead(spawn);
894 return PTR_ERR(aead);
898 align = crypto_aead_alignmask(aead);
899 align &= ~(crypto_tfm_ctx_alignment() - 1);
900 crypto_aead_set_reqsize(
902 sizeof(struct crypto_rfc4106_req_ctx) +
903 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
909 static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
911 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
913 crypto_free_aead(ctx->child);
916 static void crypto_rfc4106_free(struct aead_instance *inst)
918 crypto_drop_aead(aead_instance_ctx(inst));
922 static int crypto_rfc4106_create(struct crypto_template *tmpl,
925 struct crypto_attr_type *algt;
926 struct aead_instance *inst;
927 struct crypto_aead_spawn *spawn;
928 struct aead_alg *alg;
929 const char *ccm_name;
932 algt = crypto_get_attr_type(tb);
934 return PTR_ERR(algt);
936 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
939 ccm_name = crypto_attr_alg_name(tb[1]);
940 if (IS_ERR(ccm_name))
941 return PTR_ERR(ccm_name);
943 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
947 spawn = aead_instance_ctx(inst);
948 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
949 err = crypto_grab_aead(spawn, ccm_name, 0,
950 crypto_requires_sync(algt->type, algt->mask));
954 alg = crypto_spawn_aead_alg(spawn);
958 /* Underlying IV size must be 12. */
959 if (crypto_aead_alg_ivsize(alg) != 12)
962 /* Not a stream cipher? */
963 if (alg->base.cra_blocksize != 1)
967 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
968 "rfc4106(%s)", alg->base.cra_name) >=
969 CRYPTO_MAX_ALG_NAME ||
970 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
971 "rfc4106(%s)", alg->base.cra_driver_name) >=
975 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
976 inst->alg.base.cra_priority = alg->base.cra_priority;
977 inst->alg.base.cra_blocksize = 1;
978 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
980 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
982 inst->alg.ivsize = 8;
983 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
985 inst->alg.init = crypto_rfc4106_init_tfm;
986 inst->alg.exit = crypto_rfc4106_exit_tfm;
988 inst->alg.setkey = crypto_rfc4106_setkey;
989 inst->alg.setauthsize = crypto_rfc4106_setauthsize;
990 inst->alg.encrypt = crypto_rfc4106_encrypt;
991 inst->alg.decrypt = crypto_rfc4106_decrypt;
993 inst->free = crypto_rfc4106_free;
995 err = aead_register_instance(tmpl, inst);
1003 crypto_drop_aead(spawn);
1009 static struct crypto_template crypto_rfc4106_tmpl = {
1011 .create = crypto_rfc4106_create,
1012 .module = THIS_MODULE,
1015 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1016 unsigned int keylen)
1018 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1019 struct crypto_aead *child = ctx->child;
1026 memcpy(ctx->nonce, key + keylen, 4);
1028 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1029 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1030 CRYPTO_TFM_REQ_MASK);
1031 err = crypto_aead_setkey(child, key, keylen);
1032 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1033 CRYPTO_TFM_RES_MASK);
1038 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1039 unsigned int authsize)
1041 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1046 return crypto_aead_setauthsize(ctx->child, authsize);
1049 static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
1051 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1052 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1053 struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
1054 struct aead_request *subreq = &rctx->subreq;
1055 unsigned int authsize = crypto_aead_authsize(aead);
1056 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1057 crypto_aead_alignmask(ctx->child) + 1);
1060 if (req->src != req->dst) {
1061 err = crypto_rfc4543_copy_src_to_dst(req, enc);
1066 memcpy(iv, ctx->nonce, 4);
1067 memcpy(iv + 4, req->iv, 8);
1069 aead_request_set_tfm(subreq, ctx->child);
1070 aead_request_set_callback(subreq, req->base.flags,
1071 req->base.complete, req->base.data);
1072 aead_request_set_crypt(subreq, req->src, req->dst,
1073 enc ? 0 : authsize, iv);
1074 aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
1077 return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
1080 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1082 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1083 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1084 unsigned int authsize = crypto_aead_authsize(aead);
1085 unsigned int nbytes = req->assoclen + req->cryptlen -
1086 (enc ? 0 : authsize);
1087 struct blkcipher_desc desc = {
1091 return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes);
1094 static int crypto_rfc4543_encrypt(struct aead_request *req)
1096 return crypto_rfc4543_crypt(req, true);
1099 static int crypto_rfc4543_decrypt(struct aead_request *req)
1101 return crypto_rfc4543_crypt(req, false);
1104 static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
1106 struct aead_instance *inst = aead_alg_instance(tfm);
1107 struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
1108 struct crypto_aead_spawn *spawn = &ictx->aead;
1109 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1110 struct crypto_aead *aead;
1111 struct crypto_blkcipher *null;
1112 unsigned long align;
1115 aead = crypto_spawn_aead(spawn);
1117 return PTR_ERR(aead);
1119 null = crypto_get_default_null_skcipher();
1120 err = PTR_ERR(null);
1127 align = crypto_aead_alignmask(aead);
1128 align &= ~(crypto_tfm_ctx_alignment() - 1);
1129 crypto_aead_set_reqsize(
1131 sizeof(struct crypto_rfc4543_req_ctx) +
1132 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1138 crypto_free_aead(aead);
1142 static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1144 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1146 crypto_free_aead(ctx->child);
1147 crypto_put_default_null_skcipher();
1150 static void crypto_rfc4543_free(struct aead_instance *inst)
1152 struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1154 crypto_drop_aead(&ctx->aead);
1159 static int crypto_rfc4543_create(struct crypto_template *tmpl,
1162 struct crypto_attr_type *algt;
1163 struct aead_instance *inst;
1164 struct crypto_aead_spawn *spawn;
1165 struct aead_alg *alg;
1166 struct crypto_rfc4543_instance_ctx *ctx;
1167 const char *ccm_name;
1170 algt = crypto_get_attr_type(tb);
1172 return PTR_ERR(algt);
1174 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1177 ccm_name = crypto_attr_alg_name(tb[1]);
1178 if (IS_ERR(ccm_name))
1179 return PTR_ERR(ccm_name);
1181 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1185 ctx = aead_instance_ctx(inst);
1187 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
1188 err = crypto_grab_aead(spawn, ccm_name, 0,
1189 crypto_requires_sync(algt->type, algt->mask));
1193 alg = crypto_spawn_aead_alg(spawn);
1197 /* Underlying IV size must be 12. */
1198 if (crypto_aead_alg_ivsize(alg) != 12)
1201 /* Not a stream cipher? */
1202 if (alg->base.cra_blocksize != 1)
1205 err = -ENAMETOOLONG;
1206 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1207 "rfc4543(%s)", alg->base.cra_name) >=
1208 CRYPTO_MAX_ALG_NAME ||
1209 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1210 "rfc4543(%s)", alg->base.cra_driver_name) >=
1211 CRYPTO_MAX_ALG_NAME)
1214 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1215 inst->alg.base.cra_priority = alg->base.cra_priority;
1216 inst->alg.base.cra_blocksize = 1;
1217 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1219 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1221 inst->alg.ivsize = 8;
1222 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1224 inst->alg.init = crypto_rfc4543_init_tfm;
1225 inst->alg.exit = crypto_rfc4543_exit_tfm;
1227 inst->alg.setkey = crypto_rfc4543_setkey;
1228 inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1229 inst->alg.encrypt = crypto_rfc4543_encrypt;
1230 inst->alg.decrypt = crypto_rfc4543_decrypt;
1232 inst->free = crypto_rfc4543_free,
1234 err = aead_register_instance(tmpl, inst);
1242 crypto_drop_aead(spawn);
1248 static struct crypto_template crypto_rfc4543_tmpl = {
1250 .create = crypto_rfc4543_create,
1251 .module = THIS_MODULE,
1254 static int __init crypto_gcm_module_init(void)
1258 gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1262 sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1264 err = crypto_register_template(&crypto_gcm_base_tmpl);
1268 err = crypto_register_template(&crypto_gcm_tmpl);
1272 err = crypto_register_template(&crypto_rfc4106_tmpl);
1276 err = crypto_register_template(&crypto_rfc4543_tmpl);
1278 goto out_undo_rfc4106;
1283 crypto_unregister_template(&crypto_rfc4106_tmpl);
1285 crypto_unregister_template(&crypto_gcm_tmpl);
1287 crypto_unregister_template(&crypto_gcm_base_tmpl);
1293 static void __exit crypto_gcm_module_exit(void)
1296 crypto_unregister_template(&crypto_rfc4543_tmpl);
1297 crypto_unregister_template(&crypto_rfc4106_tmpl);
1298 crypto_unregister_template(&crypto_gcm_tmpl);
1299 crypto_unregister_template(&crypto_gcm_base_tmpl);
1302 module_init(crypto_gcm_module_init);
1303 module_exit(crypto_gcm_module_exit);
1305 MODULE_LICENSE("GPL");
1306 MODULE_DESCRIPTION("Galois/Counter Mode");
1307 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1308 MODULE_ALIAS_CRYPTO("gcm_base");
1309 MODULE_ALIAS_CRYPTO("rfc4106");
1310 MODULE_ALIAS_CRYPTO("rfc4543");
1311 MODULE_ALIAS_CRYPTO("gcm");