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/scatterwalk.h>
16 #include <crypto/hash.h>
18 #include <linux/completion.h>
19 #include <linux/err.h>
20 #include <linux/init.h>
21 #include <linux/kernel.h>
22 #include <linux/module.h>
23 #include <linux/slab.h>
25 struct gcm_instance_ctx {
26 struct crypto_skcipher_spawn ctr;
27 struct crypto_ahash_spawn ghash;
30 struct crypto_gcm_ctx {
31 struct crypto_ablkcipher *ctr;
32 struct crypto_ahash *ghash;
35 struct crypto_rfc4106_ctx {
36 struct crypto_aead *child;
40 struct crypto_rfc4543_instance_ctx {
41 struct crypto_aead_spawn aead;
42 struct crypto_skcipher_spawn null;
45 struct crypto_rfc4543_ctx {
46 struct crypto_aead *child;
47 struct crypto_blkcipher *null;
51 struct crypto_rfc4543_req_ctx {
54 struct scatterlist cipher[1];
55 struct scatterlist payload[2];
56 struct scatterlist assoc[2];
57 struct aead_request subreq;
60 struct crypto_gcm_ghash_ctx {
61 unsigned int cryptlen;
62 struct scatterlist *src;
63 void (*complete)(struct aead_request *req, int err);
66 struct crypto_gcm_req_priv_ctx {
69 struct scatterlist src[2];
70 struct scatterlist dst[2];
71 struct crypto_gcm_ghash_ctx ghash_ctx;
73 struct ahash_request ahreq;
74 struct ablkcipher_request abreq;
78 struct crypto_gcm_setkey_result {
80 struct completion completion;
83 static void *gcm_zeroes;
85 static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
86 struct aead_request *req)
88 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
90 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
93 static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
95 struct crypto_gcm_setkey_result *result = req->data;
97 if (err == -EINPROGRESS)
101 complete(&result->completion);
104 static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
107 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
108 struct crypto_ahash *ghash = ctx->ghash;
109 struct crypto_ablkcipher *ctr = ctx->ctr;
114 struct crypto_gcm_setkey_result result;
116 struct scatterlist sg[1];
117 struct ablkcipher_request req;
121 crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
122 crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
123 CRYPTO_TFM_REQ_MASK);
125 err = crypto_ablkcipher_setkey(ctr, key, keylen);
129 crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
130 CRYPTO_TFM_RES_MASK);
132 data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
137 init_completion(&data->result.completion);
138 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
139 ablkcipher_request_set_tfm(&data->req, ctr);
140 ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
141 CRYPTO_TFM_REQ_MAY_BACKLOG,
142 crypto_gcm_setkey_done,
144 ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
145 sizeof(data->hash), data->iv);
147 err = crypto_ablkcipher_encrypt(&data->req);
148 if (err == -EINPROGRESS || err == -EBUSY) {
149 err = wait_for_completion_interruptible(
150 &data->result.completion);
152 err = data->result.err;
158 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
159 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
160 CRYPTO_TFM_REQ_MASK);
161 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
162 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
163 CRYPTO_TFM_RES_MASK);
170 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
171 unsigned int authsize)
189 static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
190 struct aead_request *req,
191 unsigned int cryptlen)
193 struct crypto_aead *aead = crypto_aead_reqtfm(req);
194 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
195 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
196 struct scatterlist *dst;
197 __be32 counter = cpu_to_be32(1);
199 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
200 memcpy(req->iv + 12, &counter, 4);
202 sg_init_table(pctx->src, 2);
203 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
204 scatterwalk_sg_chain(pctx->src, 2, req->src);
207 if (req->src != req->dst) {
208 sg_init_table(pctx->dst, 2);
209 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
210 scatterwalk_sg_chain(pctx->dst, 2, req->dst);
214 ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
215 ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
216 cryptlen + sizeof(pctx->auth_tag),
220 static inline unsigned int gcm_remain(unsigned int len)
223 return len ? 16 - len : 0;
226 static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
227 static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
229 static int gcm_hash_update(struct aead_request *req,
230 struct crypto_gcm_req_priv_ctx *pctx,
231 crypto_completion_t compl,
232 struct scatterlist *src,
235 struct ahash_request *ahreq = &pctx->u.ahreq;
237 ahash_request_set_callback(ahreq, aead_request_flags(req),
239 ahash_request_set_crypt(ahreq, src, NULL, len);
241 return crypto_ahash_update(ahreq);
244 static int gcm_hash_remain(struct aead_request *req,
245 struct crypto_gcm_req_priv_ctx *pctx,
247 crypto_completion_t compl)
249 struct ahash_request *ahreq = &pctx->u.ahreq;
251 ahash_request_set_callback(ahreq, aead_request_flags(req),
253 sg_init_one(pctx->src, gcm_zeroes, remain);
254 ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
256 return crypto_ahash_update(ahreq);
259 static int gcm_hash_len(struct aead_request *req,
260 struct crypto_gcm_req_priv_ctx *pctx)
262 struct ahash_request *ahreq = &pctx->u.ahreq;
263 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
266 lengths.a = cpu_to_be64(req->assoclen * 8);
267 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
268 memcpy(pctx->iauth_tag, &lengths, 16);
269 sg_init_one(pctx->src, pctx->iauth_tag, 16);
270 ahash_request_set_callback(ahreq, aead_request_flags(req),
271 gcm_hash_len_done, req);
272 ahash_request_set_crypt(ahreq, pctx->src,
273 NULL, sizeof(lengths));
275 return crypto_ahash_update(ahreq);
278 static int gcm_hash_final(struct aead_request *req,
279 struct crypto_gcm_req_priv_ctx *pctx)
281 struct ahash_request *ahreq = &pctx->u.ahreq;
283 ahash_request_set_callback(ahreq, aead_request_flags(req),
284 gcm_hash_final_done, req);
285 ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
287 return crypto_ahash_final(ahreq);
290 static void __gcm_hash_final_done(struct aead_request *req, int err)
292 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
293 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
296 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
298 gctx->complete(req, err);
301 static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
303 struct aead_request *req = areq->data;
305 __gcm_hash_final_done(req, err);
308 static void __gcm_hash_len_done(struct aead_request *req, int err)
310 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
313 err = gcm_hash_final(req, pctx);
314 if (err == -EINPROGRESS || err == -EBUSY)
318 __gcm_hash_final_done(req, err);
321 static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
323 struct aead_request *req = areq->data;
325 __gcm_hash_len_done(req, err);
328 static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
330 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
333 err = gcm_hash_len(req, pctx);
334 if (err == -EINPROGRESS || err == -EBUSY)
338 __gcm_hash_len_done(req, err);
341 static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
344 struct aead_request *req = areq->data;
346 __gcm_hash_crypt_remain_done(req, err);
349 static void __gcm_hash_crypt_done(struct aead_request *req, int err)
351 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
352 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
356 remain = gcm_remain(gctx->cryptlen);
358 err = gcm_hash_remain(req, pctx, remain,
359 gcm_hash_crypt_remain_done);
360 if (err == -EINPROGRESS || err == -EBUSY)
364 __gcm_hash_crypt_remain_done(req, err);
367 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
369 struct aead_request *req = areq->data;
371 __gcm_hash_crypt_done(req, err);
374 static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
376 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
377 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
378 crypto_completion_t compl;
379 unsigned int remain = 0;
381 if (!err && gctx->cryptlen) {
382 remain = gcm_remain(gctx->cryptlen);
383 compl = remain ? gcm_hash_crypt_done :
384 gcm_hash_crypt_remain_done;
385 err = gcm_hash_update(req, pctx, compl,
386 gctx->src, gctx->cryptlen);
387 if (err == -EINPROGRESS || err == -EBUSY)
392 __gcm_hash_crypt_done(req, err);
394 __gcm_hash_crypt_remain_done(req, err);
397 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
400 struct aead_request *req = areq->data;
402 __gcm_hash_assoc_remain_done(req, err);
405 static void __gcm_hash_assoc_done(struct aead_request *req, int err)
407 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
411 remain = gcm_remain(req->assoclen);
413 err = gcm_hash_remain(req, pctx, remain,
414 gcm_hash_assoc_remain_done);
415 if (err == -EINPROGRESS || err == -EBUSY)
419 __gcm_hash_assoc_remain_done(req, err);
422 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
424 struct aead_request *req = areq->data;
426 __gcm_hash_assoc_done(req, err);
429 static void __gcm_hash_init_done(struct aead_request *req, int err)
431 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
432 crypto_completion_t compl;
433 unsigned int remain = 0;
435 if (!err && req->assoclen) {
436 remain = gcm_remain(req->assoclen);
437 compl = remain ? gcm_hash_assoc_done :
438 gcm_hash_assoc_remain_done;
439 err = gcm_hash_update(req, pctx, compl,
440 req->assoc, req->assoclen);
441 if (err == -EINPROGRESS || err == -EBUSY)
446 __gcm_hash_assoc_done(req, err);
448 __gcm_hash_assoc_remain_done(req, err);
451 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
453 struct aead_request *req = areq->data;
455 __gcm_hash_init_done(req, err);
458 static int gcm_hash(struct aead_request *req,
459 struct crypto_gcm_req_priv_ctx *pctx)
461 struct ahash_request *ahreq = &pctx->u.ahreq;
462 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
463 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
465 crypto_completion_t compl;
468 ahash_request_set_tfm(ahreq, ctx->ghash);
470 ahash_request_set_callback(ahreq, aead_request_flags(req),
471 gcm_hash_init_done, req);
472 err = crypto_ahash_init(ahreq);
475 remain = gcm_remain(req->assoclen);
476 compl = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
477 err = gcm_hash_update(req, pctx, compl, req->assoc, req->assoclen);
481 err = gcm_hash_remain(req, pctx, remain,
482 gcm_hash_assoc_remain_done);
486 remain = gcm_remain(gctx->cryptlen);
487 compl = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
488 err = gcm_hash_update(req, pctx, compl, gctx->src, gctx->cryptlen);
492 err = gcm_hash_remain(req, pctx, remain,
493 gcm_hash_crypt_remain_done);
497 err = gcm_hash_len(req, pctx);
500 err = gcm_hash_final(req, pctx);
507 static void gcm_enc_copy_hash(struct aead_request *req,
508 struct crypto_gcm_req_priv_ctx *pctx)
510 struct crypto_aead *aead = crypto_aead_reqtfm(req);
511 u8 *auth_tag = pctx->auth_tag;
513 scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
514 crypto_aead_authsize(aead), 1);
517 static void gcm_enc_hash_done(struct aead_request *req, int err)
519 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
522 gcm_enc_copy_hash(req, pctx);
524 aead_request_complete(req, err);
527 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
529 struct aead_request *req = areq->data;
530 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
533 err = gcm_hash(req, pctx);
534 if (err == -EINPROGRESS || err == -EBUSY)
537 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
538 gcm_enc_copy_hash(req, pctx);
542 aead_request_complete(req, err);
545 static int crypto_gcm_encrypt(struct aead_request *req)
547 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
548 struct ablkcipher_request *abreq = &pctx->u.abreq;
549 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
552 crypto_gcm_init_crypt(abreq, req, req->cryptlen);
553 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
554 gcm_encrypt_done, req);
556 gctx->src = req->dst;
557 gctx->cryptlen = req->cryptlen;
558 gctx->complete = gcm_enc_hash_done;
560 err = crypto_ablkcipher_encrypt(abreq);
564 err = gcm_hash(req, pctx);
568 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
569 gcm_enc_copy_hash(req, pctx);
574 static int crypto_gcm_verify(struct aead_request *req,
575 struct crypto_gcm_req_priv_ctx *pctx)
577 struct crypto_aead *aead = crypto_aead_reqtfm(req);
578 u8 *auth_tag = pctx->auth_tag;
579 u8 *iauth_tag = pctx->iauth_tag;
580 unsigned int authsize = crypto_aead_authsize(aead);
581 unsigned int cryptlen = req->cryptlen - authsize;
583 crypto_xor(auth_tag, iauth_tag, 16);
584 scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
585 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
588 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
590 struct aead_request *req = areq->data;
591 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
594 err = crypto_gcm_verify(req, pctx);
596 aead_request_complete(req, err);
599 static void gcm_dec_hash_done(struct aead_request *req, int err)
601 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
602 struct ablkcipher_request *abreq = &pctx->u.abreq;
603 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
606 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
607 gcm_decrypt_done, req);
608 crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
609 err = crypto_ablkcipher_decrypt(abreq);
610 if (err == -EINPROGRESS || err == -EBUSY)
613 err = crypto_gcm_verify(req, pctx);
616 aead_request_complete(req, err);
619 static int crypto_gcm_decrypt(struct aead_request *req)
621 struct crypto_aead *aead = crypto_aead_reqtfm(req);
622 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
623 struct ablkcipher_request *abreq = &pctx->u.abreq;
624 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
625 unsigned int authsize = crypto_aead_authsize(aead);
626 unsigned int cryptlen = req->cryptlen;
629 if (cryptlen < authsize)
631 cryptlen -= authsize;
633 gctx->src = req->src;
634 gctx->cryptlen = cryptlen;
635 gctx->complete = gcm_dec_hash_done;
637 err = gcm_hash(req, pctx);
641 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
642 gcm_decrypt_done, req);
643 crypto_gcm_init_crypt(abreq, req, cryptlen);
644 err = crypto_ablkcipher_decrypt(abreq);
648 return crypto_gcm_verify(req, pctx);
651 static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
653 struct crypto_instance *inst = (void *)tfm->__crt_alg;
654 struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
655 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
656 struct crypto_ablkcipher *ctr;
657 struct crypto_ahash *ghash;
661 ghash = crypto_spawn_ahash(&ictx->ghash);
663 return PTR_ERR(ghash);
665 ctr = crypto_spawn_skcipher(&ictx->ctr);
673 align = crypto_tfm_alg_alignmask(tfm);
674 align &= ~(crypto_tfm_ctx_alignment() - 1);
675 tfm->crt_aead.reqsize = align +
676 offsetof(struct crypto_gcm_req_priv_ctx, u) +
677 max(sizeof(struct ablkcipher_request) +
678 crypto_ablkcipher_reqsize(ctr),
679 sizeof(struct ahash_request) +
680 crypto_ahash_reqsize(ghash));
685 crypto_free_ahash(ghash);
689 static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
691 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
693 crypto_free_ahash(ctx->ghash);
694 crypto_free_ablkcipher(ctx->ctr);
697 static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
698 const char *full_name,
699 const char *ctr_name,
700 const char *ghash_name)
702 struct crypto_attr_type *algt;
703 struct crypto_instance *inst;
704 struct crypto_alg *ctr;
705 struct crypto_alg *ghash_alg;
706 struct ahash_alg *ghash_ahash_alg;
707 struct gcm_instance_ctx *ctx;
710 algt = crypto_get_attr_type(tb);
712 return ERR_CAST(algt);
714 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
715 return ERR_PTR(-EINVAL);
717 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
718 CRYPTO_ALG_TYPE_HASH,
719 CRYPTO_ALG_TYPE_AHASH_MASK);
720 if (IS_ERR(ghash_alg))
721 return ERR_CAST(ghash_alg);
724 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
728 ctx = crypto_instance_ctx(inst);
729 ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
730 err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
735 crypto_set_skcipher_spawn(&ctx->ctr, inst);
736 err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
737 crypto_requires_sync(algt->type,
742 ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
744 /* We only support 16-byte blocks. */
745 if (ctr->cra_ablkcipher.ivsize != 16)
748 /* Not a stream cipher? */
750 if (ctr->cra_blocksize != 1)
754 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
755 "gcm_base(%s,%s)", ctr->cra_driver_name,
756 ghash_alg->cra_driver_name) >=
760 memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
762 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
763 inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
764 inst->alg.cra_priority = ctr->cra_priority;
765 inst->alg.cra_blocksize = 1;
766 inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
767 inst->alg.cra_type = &crypto_aead_type;
768 inst->alg.cra_aead.ivsize = 16;
769 inst->alg.cra_aead.maxauthsize = 16;
770 inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
771 inst->alg.cra_init = crypto_gcm_init_tfm;
772 inst->alg.cra_exit = crypto_gcm_exit_tfm;
773 inst->alg.cra_aead.setkey = crypto_gcm_setkey;
774 inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
775 inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
776 inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
779 crypto_mod_put(ghash_alg);
783 crypto_drop_skcipher(&ctx->ctr);
785 crypto_drop_ahash(&ctx->ghash);
793 static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
795 const char *cipher_name;
796 char ctr_name[CRYPTO_MAX_ALG_NAME];
797 char full_name[CRYPTO_MAX_ALG_NAME];
799 cipher_name = crypto_attr_alg_name(tb[1]);
800 if (IS_ERR(cipher_name))
801 return ERR_CAST(cipher_name);
803 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
805 return ERR_PTR(-ENAMETOOLONG);
807 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
809 return ERR_PTR(-ENAMETOOLONG);
811 return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash");
814 static void crypto_gcm_free(struct crypto_instance *inst)
816 struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
818 crypto_drop_skcipher(&ctx->ctr);
819 crypto_drop_ahash(&ctx->ghash);
823 static struct crypto_template crypto_gcm_tmpl = {
825 .alloc = crypto_gcm_alloc,
826 .free = crypto_gcm_free,
827 .module = THIS_MODULE,
830 static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
832 const char *ctr_name;
833 const char *ghash_name;
834 char full_name[CRYPTO_MAX_ALG_NAME];
836 ctr_name = crypto_attr_alg_name(tb[1]);
837 if (IS_ERR(ctr_name))
838 return ERR_CAST(ctr_name);
840 ghash_name = crypto_attr_alg_name(tb[2]);
841 if (IS_ERR(ghash_name))
842 return ERR_CAST(ghash_name);
844 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
845 ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
846 return ERR_PTR(-ENAMETOOLONG);
848 return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name);
851 static struct crypto_template crypto_gcm_base_tmpl = {
853 .alloc = crypto_gcm_base_alloc,
854 .free = crypto_gcm_free,
855 .module = THIS_MODULE,
858 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
861 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
862 struct crypto_aead *child = ctx->child;
869 memcpy(ctx->nonce, key + keylen, 4);
871 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
872 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
873 CRYPTO_TFM_REQ_MASK);
874 err = crypto_aead_setkey(child, key, keylen);
875 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
876 CRYPTO_TFM_RES_MASK);
881 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
882 unsigned int authsize)
884 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
895 return crypto_aead_setauthsize(ctx->child, authsize);
898 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
900 struct aead_request *subreq = aead_request_ctx(req);
901 struct crypto_aead *aead = crypto_aead_reqtfm(req);
902 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
903 struct crypto_aead *child = ctx->child;
904 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
905 crypto_aead_alignmask(child) + 1);
907 memcpy(iv, ctx->nonce, 4);
908 memcpy(iv + 4, req->iv, 8);
910 aead_request_set_tfm(subreq, child);
911 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
913 aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
914 aead_request_set_assoc(subreq, req->assoc, req->assoclen);
919 static int crypto_rfc4106_encrypt(struct aead_request *req)
921 req = crypto_rfc4106_crypt(req);
923 return crypto_aead_encrypt(req);
926 static int crypto_rfc4106_decrypt(struct aead_request *req)
928 req = crypto_rfc4106_crypt(req);
930 return crypto_aead_decrypt(req);
933 static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm)
935 struct crypto_instance *inst = (void *)tfm->__crt_alg;
936 struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
937 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
938 struct crypto_aead *aead;
941 aead = crypto_spawn_aead(spawn);
943 return PTR_ERR(aead);
947 align = crypto_aead_alignmask(aead);
948 align &= ~(crypto_tfm_ctx_alignment() - 1);
949 tfm->crt_aead.reqsize = sizeof(struct aead_request) +
950 ALIGN(crypto_aead_reqsize(aead),
951 crypto_tfm_ctx_alignment()) +
957 static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm)
959 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
961 crypto_free_aead(ctx->child);
964 static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
966 struct crypto_attr_type *algt;
967 struct crypto_instance *inst;
968 struct crypto_aead_spawn *spawn;
969 struct crypto_alg *alg;
970 const char *ccm_name;
973 algt = crypto_get_attr_type(tb);
975 return ERR_CAST(algt);
977 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
978 return ERR_PTR(-EINVAL);
980 ccm_name = crypto_attr_alg_name(tb[1]);
981 if (IS_ERR(ccm_name))
982 return ERR_CAST(ccm_name);
984 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
986 return ERR_PTR(-ENOMEM);
988 spawn = crypto_instance_ctx(inst);
989 crypto_set_aead_spawn(spawn, inst);
990 err = crypto_grab_aead(spawn, ccm_name, 0,
991 crypto_requires_sync(algt->type, algt->mask));
995 alg = crypto_aead_spawn_alg(spawn);
999 /* We only support 16-byte blocks. */
1000 if (alg->cra_aead.ivsize != 16)
1003 /* Not a stream cipher? */
1004 if (alg->cra_blocksize != 1)
1007 err = -ENAMETOOLONG;
1008 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1009 "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1010 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1011 "rfc4106(%s)", alg->cra_driver_name) >=
1012 CRYPTO_MAX_ALG_NAME)
1015 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1016 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1017 inst->alg.cra_priority = alg->cra_priority;
1018 inst->alg.cra_blocksize = 1;
1019 inst->alg.cra_alignmask = alg->cra_alignmask;
1020 inst->alg.cra_type = &crypto_nivaead_type;
1022 inst->alg.cra_aead.ivsize = 8;
1023 inst->alg.cra_aead.maxauthsize = 16;
1025 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
1027 inst->alg.cra_init = crypto_rfc4106_init_tfm;
1028 inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
1030 inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
1031 inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
1032 inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
1033 inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
1035 inst->alg.cra_aead.geniv = "seqiv";
1041 crypto_drop_aead(spawn);
1044 inst = ERR_PTR(err);
1048 static void crypto_rfc4106_free(struct crypto_instance *inst)
1050 crypto_drop_spawn(crypto_instance_ctx(inst));
1054 static struct crypto_template crypto_rfc4106_tmpl = {
1056 .alloc = crypto_rfc4106_alloc,
1057 .free = crypto_rfc4106_free,
1058 .module = THIS_MODULE,
1061 static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_reqctx(
1062 struct aead_request *req)
1064 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
1066 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
1069 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1070 unsigned int keylen)
1072 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1073 struct crypto_aead *child = ctx->child;
1080 memcpy(ctx->nonce, key + keylen, 4);
1082 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1083 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1084 CRYPTO_TFM_REQ_MASK);
1085 err = crypto_aead_setkey(child, key, keylen);
1086 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1087 CRYPTO_TFM_RES_MASK);
1092 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1093 unsigned int authsize)
1095 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1100 return crypto_aead_setauthsize(ctx->child, authsize);
1103 static void crypto_rfc4543_done(struct crypto_async_request *areq, int err)
1105 struct aead_request *req = areq->data;
1106 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1107 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1110 scatterwalk_map_and_copy(rctx->auth_tag, req->dst,
1112 crypto_aead_authsize(aead), 1);
1115 aead_request_complete(req, err);
1118 static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
1121 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1122 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1123 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1124 struct aead_request *subreq = &rctx->subreq;
1125 struct scatterlist *src = req->src;
1126 struct scatterlist *cipher = rctx->cipher;
1127 struct scatterlist *payload = rctx->payload;
1128 struct scatterlist *assoc = rctx->assoc;
1129 unsigned int authsize = crypto_aead_authsize(aead);
1130 unsigned int assoclen = req->assoclen;
1133 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1134 crypto_aead_alignmask(ctx->child) + 1);
1136 memcpy(iv, ctx->nonce, 4);
1137 memcpy(iv + 4, req->iv, 8);
1139 /* construct cipher/plaintext */
1141 memset(rctx->auth_tag, 0, authsize);
1143 scatterwalk_map_and_copy(rctx->auth_tag, src,
1144 req->cryptlen - authsize,
1147 sg_init_one(cipher, rctx->auth_tag, authsize);
1149 /* construct the aad */
1150 srcp = sg_page(src);
1151 vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
1153 sg_init_table(payload, 2);
1154 sg_set_buf(payload, req->iv, 8);
1155 scatterwalk_crypto_chain(payload, src, vsrc == req->iv + 8, 2);
1156 assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
1158 if (req->assoc->length == req->assoclen) {
1159 sg_init_table(assoc, 2);
1160 sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
1161 req->assoc->offset);
1163 BUG_ON(req->assoclen > sizeof(rctx->assocbuf));
1165 scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0,
1168 sg_init_table(assoc, 2);
1169 sg_set_buf(assoc, rctx->assocbuf, req->assoclen);
1171 scatterwalk_crypto_chain(assoc, payload, 0, 2);
1173 aead_request_set_tfm(subreq, ctx->child);
1174 aead_request_set_callback(subreq, req->base.flags, crypto_rfc4543_done,
1176 aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
1177 aead_request_set_assoc(subreq, assoc, assoclen);
1182 static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1184 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1185 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1186 unsigned int authsize = crypto_aead_authsize(aead);
1187 unsigned int nbytes = req->cryptlen - (enc ? 0 : authsize);
1188 struct blkcipher_desc desc = {
1192 return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes);
1195 static int crypto_rfc4543_encrypt(struct aead_request *req)
1197 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1198 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1199 struct aead_request *subreq;
1202 if (req->src != req->dst) {
1203 err = crypto_rfc4543_copy_src_to_dst(req, true);
1208 subreq = crypto_rfc4543_crypt(req, true);
1209 err = crypto_aead_encrypt(subreq);
1213 scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
1214 crypto_aead_authsize(aead), 1);
1219 static int crypto_rfc4543_decrypt(struct aead_request *req)
1223 if (req->src != req->dst) {
1224 err = crypto_rfc4543_copy_src_to_dst(req, false);
1229 req = crypto_rfc4543_crypt(req, false);
1231 return crypto_aead_decrypt(req);
1234 static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
1236 struct crypto_instance *inst = (void *)tfm->__crt_alg;
1237 struct crypto_rfc4543_instance_ctx *ictx = crypto_instance_ctx(inst);
1238 struct crypto_aead_spawn *spawn = &ictx->aead;
1239 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1240 struct crypto_aead *aead;
1241 struct crypto_blkcipher *null;
1242 unsigned long align;
1245 aead = crypto_spawn_aead(spawn);
1247 return PTR_ERR(aead);
1249 null = crypto_spawn_blkcipher(&ictx->null.base);
1250 err = PTR_ERR(null);
1257 align = crypto_aead_alignmask(aead);
1258 align &= ~(crypto_tfm_ctx_alignment() - 1);
1259 tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
1260 ALIGN(crypto_aead_reqsize(aead),
1261 crypto_tfm_ctx_alignment()) +
1267 crypto_free_aead(aead);
1271 static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
1273 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1275 crypto_free_aead(ctx->child);
1276 crypto_free_blkcipher(ctx->null);
1279 static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
1281 struct crypto_attr_type *algt;
1282 struct crypto_instance *inst;
1283 struct crypto_aead_spawn *spawn;
1284 struct crypto_alg *alg;
1285 struct crypto_rfc4543_instance_ctx *ctx;
1286 const char *ccm_name;
1289 algt = crypto_get_attr_type(tb);
1291 return ERR_CAST(algt);
1293 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1294 return ERR_PTR(-EINVAL);
1296 ccm_name = crypto_attr_alg_name(tb[1]);
1297 if (IS_ERR(ccm_name))
1298 return ERR_CAST(ccm_name);
1300 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1302 return ERR_PTR(-ENOMEM);
1304 ctx = crypto_instance_ctx(inst);
1306 crypto_set_aead_spawn(spawn, inst);
1307 err = crypto_grab_aead(spawn, ccm_name, 0,
1308 crypto_requires_sync(algt->type, algt->mask));
1312 alg = crypto_aead_spawn_alg(spawn);
1314 crypto_set_skcipher_spawn(&ctx->null, inst);
1315 err = crypto_grab_skcipher(&ctx->null, "ecb(cipher_null)", 0,
1320 crypto_skcipher_spawn_alg(&ctx->null);
1324 /* We only support 16-byte blocks. */
1325 if (alg->cra_aead.ivsize != 16)
1326 goto out_drop_ecbnull;
1328 /* Not a stream cipher? */
1329 if (alg->cra_blocksize != 1)
1330 goto out_drop_ecbnull;
1332 err = -ENAMETOOLONG;
1333 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1334 "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1335 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1336 "rfc4543(%s)", alg->cra_driver_name) >=
1337 CRYPTO_MAX_ALG_NAME)
1338 goto out_drop_ecbnull;
1340 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1341 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1342 inst->alg.cra_priority = alg->cra_priority;
1343 inst->alg.cra_blocksize = 1;
1344 inst->alg.cra_alignmask = alg->cra_alignmask;
1345 inst->alg.cra_type = &crypto_nivaead_type;
1347 inst->alg.cra_aead.ivsize = 8;
1348 inst->alg.cra_aead.maxauthsize = 16;
1350 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1352 inst->alg.cra_init = crypto_rfc4543_init_tfm;
1353 inst->alg.cra_exit = crypto_rfc4543_exit_tfm;
1355 inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
1356 inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
1357 inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
1358 inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt;
1360 inst->alg.cra_aead.geniv = "seqiv";
1366 crypto_drop_skcipher(&ctx->null);
1368 crypto_drop_aead(spawn);
1371 inst = ERR_PTR(err);
1375 static void crypto_rfc4543_free(struct crypto_instance *inst)
1377 struct crypto_rfc4543_instance_ctx *ctx = crypto_instance_ctx(inst);
1379 crypto_drop_aead(&ctx->aead);
1380 crypto_drop_skcipher(&ctx->null);
1385 static struct crypto_template crypto_rfc4543_tmpl = {
1387 .alloc = crypto_rfc4543_alloc,
1388 .free = crypto_rfc4543_free,
1389 .module = THIS_MODULE,
1392 static int __init crypto_gcm_module_init(void)
1396 gcm_zeroes = kzalloc(16, GFP_KERNEL);
1400 err = crypto_register_template(&crypto_gcm_base_tmpl);
1404 err = crypto_register_template(&crypto_gcm_tmpl);
1408 err = crypto_register_template(&crypto_rfc4106_tmpl);
1412 err = crypto_register_template(&crypto_rfc4543_tmpl);
1414 goto out_undo_rfc4106;
1419 crypto_unregister_template(&crypto_rfc4106_tmpl);
1421 crypto_unregister_template(&crypto_gcm_tmpl);
1423 crypto_unregister_template(&crypto_gcm_base_tmpl);
1429 static void __exit crypto_gcm_module_exit(void)
1432 crypto_unregister_template(&crypto_rfc4543_tmpl);
1433 crypto_unregister_template(&crypto_rfc4106_tmpl);
1434 crypto_unregister_template(&crypto_gcm_tmpl);
1435 crypto_unregister_template(&crypto_gcm_base_tmpl);
1438 module_init(crypto_gcm_module_init);
1439 module_exit(crypto_gcm_module_exit);
1441 MODULE_LICENSE("GPL");
1442 MODULE_DESCRIPTION("Galois/Counter Mode");
1443 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1444 MODULE_ALIAS_CRYPTO("gcm_base");
1445 MODULE_ALIAS_CRYPTO("rfc4106");
1446 MODULE_ALIAS_CRYPTO("rfc4543");
1447 MODULE_ALIAS_CRYPTO("gcm");