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_ctx {
41 struct crypto_aead *child;
45 struct crypto_rfc4543_req_ctx {
48 struct scatterlist cipher[1];
49 struct scatterlist payload[2];
50 struct scatterlist assoc[2];
51 struct aead_request subreq;
54 struct crypto_gcm_ghash_ctx {
55 unsigned int cryptlen;
56 struct scatterlist *src;
57 void (*complete)(struct aead_request *req, int err);
60 struct crypto_gcm_req_priv_ctx {
63 struct scatterlist src[2];
64 struct scatterlist dst[2];
65 struct crypto_gcm_ghash_ctx ghash_ctx;
67 struct ahash_request ahreq;
68 struct ablkcipher_request abreq;
72 struct crypto_gcm_setkey_result {
74 struct completion completion;
77 static void *gcm_zeroes;
79 static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
80 struct aead_request *req)
82 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
84 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
87 static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
89 struct crypto_gcm_setkey_result *result = req->data;
91 if (err == -EINPROGRESS)
95 complete(&result->completion);
98 static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
101 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
102 struct crypto_ahash *ghash = ctx->ghash;
103 struct crypto_ablkcipher *ctr = ctx->ctr;
108 struct crypto_gcm_setkey_result result;
110 struct scatterlist sg[1];
111 struct ablkcipher_request req;
115 crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
116 crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
117 CRYPTO_TFM_REQ_MASK);
119 err = crypto_ablkcipher_setkey(ctr, key, keylen);
123 crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
124 CRYPTO_TFM_RES_MASK);
126 data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
131 init_completion(&data->result.completion);
132 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
133 ablkcipher_request_set_tfm(&data->req, ctr);
134 ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
135 CRYPTO_TFM_REQ_MAY_BACKLOG,
136 crypto_gcm_setkey_done,
138 ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
139 sizeof(data->hash), data->iv);
141 err = crypto_ablkcipher_encrypt(&data->req);
142 if (err == -EINPROGRESS || err == -EBUSY) {
143 wait_for_completion(&data->result.completion);
144 err = data->result.err;
150 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
151 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
152 CRYPTO_TFM_REQ_MASK);
153 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
154 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
155 CRYPTO_TFM_RES_MASK);
162 static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
163 unsigned int authsize)
181 static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
182 struct aead_request *req,
183 unsigned int cryptlen)
185 struct crypto_aead *aead = crypto_aead_reqtfm(req);
186 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
187 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
188 struct scatterlist *dst;
189 __be32 counter = cpu_to_be32(1);
191 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
192 memcpy(req->iv + 12, &counter, 4);
194 sg_init_table(pctx->src, 2);
195 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
196 scatterwalk_sg_chain(pctx->src, 2, req->src);
199 if (req->src != req->dst) {
200 sg_init_table(pctx->dst, 2);
201 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
202 scatterwalk_sg_chain(pctx->dst, 2, req->dst);
206 ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
207 ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
208 cryptlen + sizeof(pctx->auth_tag),
212 static inline unsigned int gcm_remain(unsigned int len)
215 return len ? 16 - len : 0;
218 static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
219 static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
221 static int gcm_hash_update(struct aead_request *req,
222 struct crypto_gcm_req_priv_ctx *pctx,
223 crypto_completion_t complete,
224 struct scatterlist *src,
227 struct ahash_request *ahreq = &pctx->u.ahreq;
229 ahash_request_set_callback(ahreq, aead_request_flags(req),
231 ahash_request_set_crypt(ahreq, src, NULL, len);
233 return crypto_ahash_update(ahreq);
236 static int gcm_hash_remain(struct aead_request *req,
237 struct crypto_gcm_req_priv_ctx *pctx,
239 crypto_completion_t complete)
241 struct ahash_request *ahreq = &pctx->u.ahreq;
243 ahash_request_set_callback(ahreq, aead_request_flags(req),
245 sg_init_one(pctx->src, gcm_zeroes, remain);
246 ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
248 return crypto_ahash_update(ahreq);
251 static int gcm_hash_len(struct aead_request *req,
252 struct crypto_gcm_req_priv_ctx *pctx)
254 struct ahash_request *ahreq = &pctx->u.ahreq;
255 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
258 lengths.a = cpu_to_be64(req->assoclen * 8);
259 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
260 memcpy(pctx->iauth_tag, &lengths, 16);
261 sg_init_one(pctx->src, pctx->iauth_tag, 16);
262 ahash_request_set_callback(ahreq, aead_request_flags(req),
263 gcm_hash_len_done, req);
264 ahash_request_set_crypt(ahreq, pctx->src,
265 NULL, sizeof(lengths));
267 return crypto_ahash_update(ahreq);
270 static int gcm_hash_final(struct aead_request *req,
271 struct crypto_gcm_req_priv_ctx *pctx)
273 struct ahash_request *ahreq = &pctx->u.ahreq;
275 ahash_request_set_callback(ahreq, aead_request_flags(req),
276 gcm_hash_final_done, req);
277 ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
279 return crypto_ahash_final(ahreq);
282 static void __gcm_hash_final_done(struct aead_request *req, int err)
284 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
285 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
288 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
290 gctx->complete(req, err);
293 static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
295 struct aead_request *req = areq->data;
297 __gcm_hash_final_done(req, err);
300 static void __gcm_hash_len_done(struct aead_request *req, int err)
302 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
305 err = gcm_hash_final(req, pctx);
306 if (err == -EINPROGRESS || err == -EBUSY)
310 __gcm_hash_final_done(req, err);
313 static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
315 struct aead_request *req = areq->data;
317 __gcm_hash_len_done(req, err);
320 static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
322 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
325 err = gcm_hash_len(req, pctx);
326 if (err == -EINPROGRESS || err == -EBUSY)
330 __gcm_hash_len_done(req, err);
333 static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
336 struct aead_request *req = areq->data;
338 __gcm_hash_crypt_remain_done(req, err);
341 static void __gcm_hash_crypt_done(struct aead_request *req, int err)
343 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
344 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
348 remain = gcm_remain(gctx->cryptlen);
350 err = gcm_hash_remain(req, pctx, remain,
351 gcm_hash_crypt_remain_done);
352 if (err == -EINPROGRESS || err == -EBUSY)
356 __gcm_hash_crypt_remain_done(req, err);
359 static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
361 struct aead_request *req = areq->data;
363 __gcm_hash_crypt_done(req, err);
366 static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
368 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
369 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
370 crypto_completion_t complete;
371 unsigned int remain = 0;
373 if (!err && gctx->cryptlen) {
374 remain = gcm_remain(gctx->cryptlen);
375 complete = remain ? gcm_hash_crypt_done :
376 gcm_hash_crypt_remain_done;
377 err = gcm_hash_update(req, pctx, complete,
378 gctx->src, gctx->cryptlen);
379 if (err == -EINPROGRESS || err == -EBUSY)
384 __gcm_hash_crypt_done(req, err);
386 __gcm_hash_crypt_remain_done(req, err);
389 static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
392 struct aead_request *req = areq->data;
394 __gcm_hash_assoc_remain_done(req, err);
397 static void __gcm_hash_assoc_done(struct aead_request *req, int err)
399 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
403 remain = gcm_remain(req->assoclen);
405 err = gcm_hash_remain(req, pctx, remain,
406 gcm_hash_assoc_remain_done);
407 if (err == -EINPROGRESS || err == -EBUSY)
411 __gcm_hash_assoc_remain_done(req, err);
414 static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
416 struct aead_request *req = areq->data;
418 __gcm_hash_assoc_done(req, err);
421 static void __gcm_hash_init_done(struct aead_request *req, int err)
423 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
424 crypto_completion_t complete;
425 unsigned int remain = 0;
427 if (!err && req->assoclen) {
428 remain = gcm_remain(req->assoclen);
429 complete = remain ? gcm_hash_assoc_done :
430 gcm_hash_assoc_remain_done;
431 err = gcm_hash_update(req, pctx, complete,
432 req->assoc, req->assoclen);
433 if (err == -EINPROGRESS || err == -EBUSY)
438 __gcm_hash_assoc_done(req, err);
440 __gcm_hash_assoc_remain_done(req, err);
443 static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
445 struct aead_request *req = areq->data;
447 __gcm_hash_init_done(req, err);
450 static int gcm_hash(struct aead_request *req,
451 struct crypto_gcm_req_priv_ctx *pctx)
453 struct ahash_request *ahreq = &pctx->u.ahreq;
454 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
455 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
457 crypto_completion_t complete;
460 ahash_request_set_tfm(ahreq, ctx->ghash);
462 ahash_request_set_callback(ahreq, aead_request_flags(req),
463 gcm_hash_init_done, req);
464 err = crypto_ahash_init(ahreq);
467 remain = gcm_remain(req->assoclen);
468 complete = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
469 err = gcm_hash_update(req, pctx, complete, req->assoc, req->assoclen);
473 err = gcm_hash_remain(req, pctx, remain,
474 gcm_hash_assoc_remain_done);
478 remain = gcm_remain(gctx->cryptlen);
479 complete = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
480 err = gcm_hash_update(req, pctx, complete, gctx->src, gctx->cryptlen);
484 err = gcm_hash_remain(req, pctx, remain,
485 gcm_hash_crypt_remain_done);
489 err = gcm_hash_len(req, pctx);
492 err = gcm_hash_final(req, pctx);
499 static void gcm_enc_copy_hash(struct aead_request *req,
500 struct crypto_gcm_req_priv_ctx *pctx)
502 struct crypto_aead *aead = crypto_aead_reqtfm(req);
503 u8 *auth_tag = pctx->auth_tag;
505 scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
506 crypto_aead_authsize(aead), 1);
509 static void gcm_enc_hash_done(struct aead_request *req, int err)
511 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
514 gcm_enc_copy_hash(req, pctx);
516 aead_request_complete(req, err);
519 static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
521 struct aead_request *req = areq->data;
522 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
525 err = gcm_hash(req, pctx);
526 if (err == -EINPROGRESS || err == -EBUSY)
529 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
530 gcm_enc_copy_hash(req, pctx);
534 aead_request_complete(req, err);
537 static int crypto_gcm_encrypt(struct aead_request *req)
539 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
540 struct ablkcipher_request *abreq = &pctx->u.abreq;
541 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
544 crypto_gcm_init_crypt(abreq, req, req->cryptlen);
545 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
546 gcm_encrypt_done, req);
548 gctx->src = req->dst;
549 gctx->cryptlen = req->cryptlen;
550 gctx->complete = gcm_enc_hash_done;
552 err = crypto_ablkcipher_encrypt(abreq);
556 err = gcm_hash(req, pctx);
560 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
561 gcm_enc_copy_hash(req, pctx);
566 static int crypto_gcm_verify(struct aead_request *req,
567 struct crypto_gcm_req_priv_ctx *pctx)
569 struct crypto_aead *aead = crypto_aead_reqtfm(req);
570 u8 *auth_tag = pctx->auth_tag;
571 u8 *iauth_tag = pctx->iauth_tag;
572 unsigned int authsize = crypto_aead_authsize(aead);
573 unsigned int cryptlen = req->cryptlen - authsize;
575 crypto_xor(auth_tag, iauth_tag, 16);
576 scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
577 return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
580 static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
582 struct aead_request *req = areq->data;
583 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
586 err = crypto_gcm_verify(req, pctx);
588 aead_request_complete(req, err);
591 static void gcm_dec_hash_done(struct aead_request *req, int err)
593 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
594 struct ablkcipher_request *abreq = &pctx->u.abreq;
595 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
598 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
599 gcm_decrypt_done, req);
600 crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
601 err = crypto_ablkcipher_decrypt(abreq);
602 if (err == -EINPROGRESS || err == -EBUSY)
605 err = crypto_gcm_verify(req, pctx);
608 aead_request_complete(req, err);
611 static int crypto_gcm_decrypt(struct aead_request *req)
613 struct crypto_aead *aead = crypto_aead_reqtfm(req);
614 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
615 struct ablkcipher_request *abreq = &pctx->u.abreq;
616 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
617 unsigned int authsize = crypto_aead_authsize(aead);
618 unsigned int cryptlen = req->cryptlen;
621 if (cryptlen < authsize)
623 cryptlen -= authsize;
625 gctx->src = req->src;
626 gctx->cryptlen = cryptlen;
627 gctx->complete = gcm_dec_hash_done;
629 err = gcm_hash(req, pctx);
633 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
634 gcm_decrypt_done, req);
635 crypto_gcm_init_crypt(abreq, req, cryptlen);
636 err = crypto_ablkcipher_decrypt(abreq);
640 return crypto_gcm_verify(req, pctx);
643 static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
645 struct crypto_instance *inst = (void *)tfm->__crt_alg;
646 struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
647 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
648 struct crypto_ablkcipher *ctr;
649 struct crypto_ahash *ghash;
653 ghash = crypto_spawn_ahash(&ictx->ghash);
655 return PTR_ERR(ghash);
657 ctr = crypto_spawn_skcipher(&ictx->ctr);
665 align = crypto_tfm_alg_alignmask(tfm);
666 align &= ~(crypto_tfm_ctx_alignment() - 1);
667 tfm->crt_aead.reqsize = align +
668 offsetof(struct crypto_gcm_req_priv_ctx, u) +
669 max(sizeof(struct ablkcipher_request) +
670 crypto_ablkcipher_reqsize(ctr),
671 sizeof(struct ahash_request) +
672 crypto_ahash_reqsize(ghash));
677 crypto_free_ahash(ghash);
681 static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
683 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
685 crypto_free_ahash(ctx->ghash);
686 crypto_free_ablkcipher(ctx->ctr);
689 static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
690 const char *full_name,
691 const char *ctr_name,
692 const char *ghash_name)
694 struct crypto_attr_type *algt;
695 struct crypto_instance *inst;
696 struct crypto_alg *ctr;
697 struct crypto_alg *ghash_alg;
698 struct ahash_alg *ghash_ahash_alg;
699 struct gcm_instance_ctx *ctx;
702 algt = crypto_get_attr_type(tb);
707 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
708 return ERR_PTR(-EINVAL);
710 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
711 CRYPTO_ALG_TYPE_HASH,
712 CRYPTO_ALG_TYPE_AHASH_MASK |
713 crypto_requires_sync(algt->type,
715 err = PTR_ERR(ghash_alg);
716 if (IS_ERR(ghash_alg))
720 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
724 ctx = crypto_instance_ctx(inst);
725 ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
726 err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
731 crypto_set_skcipher_spawn(&ctx->ctr, inst);
732 err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
733 crypto_requires_sync(algt->type,
738 ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
740 /* We only support 16-byte blocks. */
741 if (ctr->cra_ablkcipher.ivsize != 16)
744 /* Not a stream cipher? */
746 if (ctr->cra_blocksize != 1)
750 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
751 "gcm_base(%s,%s)", ctr->cra_driver_name,
752 ghash_alg->cra_driver_name) >=
756 memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
758 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
759 inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
760 inst->alg.cra_priority = ctr->cra_priority;
761 inst->alg.cra_blocksize = 1;
762 inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
763 inst->alg.cra_type = &crypto_aead_type;
764 inst->alg.cra_aead.ivsize = 16;
765 inst->alg.cra_aead.maxauthsize = 16;
766 inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
767 inst->alg.cra_init = crypto_gcm_init_tfm;
768 inst->alg.cra_exit = crypto_gcm_exit_tfm;
769 inst->alg.cra_aead.setkey = crypto_gcm_setkey;
770 inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
771 inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
772 inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
775 crypto_mod_put(ghash_alg);
779 crypto_drop_skcipher(&ctx->ctr);
781 crypto_drop_ahash(&ctx->ghash);
789 static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
792 const char *cipher_name;
793 char ctr_name[CRYPTO_MAX_ALG_NAME];
794 char full_name[CRYPTO_MAX_ALG_NAME];
796 cipher_name = crypto_attr_alg_name(tb[1]);
797 err = PTR_ERR(cipher_name);
798 if (IS_ERR(cipher_name))
801 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
803 return ERR_PTR(-ENAMETOOLONG);
805 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
807 return ERR_PTR(-ENAMETOOLONG);
809 return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash");
812 static void crypto_gcm_free(struct crypto_instance *inst)
814 struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
816 crypto_drop_skcipher(&ctx->ctr);
817 crypto_drop_ahash(&ctx->ghash);
821 static struct crypto_template crypto_gcm_tmpl = {
823 .alloc = crypto_gcm_alloc,
824 .free = crypto_gcm_free,
825 .module = THIS_MODULE,
828 static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
831 const char *ctr_name;
832 const char *ghash_name;
833 char full_name[CRYPTO_MAX_ALG_NAME];
835 ctr_name = crypto_attr_alg_name(tb[1]);
836 err = PTR_ERR(ctr_name);
837 if (IS_ERR(ctr_name))
840 ghash_name = crypto_attr_alg_name(tb[2]);
841 err = PTR_ERR(ghash_name);
842 if (IS_ERR(ghash_name))
845 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
846 ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
847 return ERR_PTR(-ENAMETOOLONG);
849 return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name);
852 static struct crypto_template crypto_gcm_base_tmpl = {
854 .alloc = crypto_gcm_base_alloc,
855 .free = crypto_gcm_free,
856 .module = THIS_MODULE,
859 static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
862 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
863 struct crypto_aead *child = ctx->child;
870 memcpy(ctx->nonce, key + keylen, 4);
872 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
873 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
874 CRYPTO_TFM_REQ_MASK);
875 err = crypto_aead_setkey(child, key, keylen);
876 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
877 CRYPTO_TFM_RES_MASK);
882 static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
883 unsigned int authsize)
885 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
896 return crypto_aead_setauthsize(ctx->child, authsize);
899 static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
901 struct aead_request *subreq = aead_request_ctx(req);
902 struct crypto_aead *aead = crypto_aead_reqtfm(req);
903 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
904 struct crypto_aead *child = ctx->child;
905 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
906 crypto_aead_alignmask(child) + 1);
908 memcpy(iv, ctx->nonce, 4);
909 memcpy(iv + 4, req->iv, 8);
911 aead_request_set_tfm(subreq, child);
912 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
914 aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
915 aead_request_set_assoc(subreq, req->assoc, req->assoclen);
920 static int crypto_rfc4106_encrypt(struct aead_request *req)
922 req = crypto_rfc4106_crypt(req);
924 return crypto_aead_encrypt(req);
927 static int crypto_rfc4106_decrypt(struct aead_request *req)
929 req = crypto_rfc4106_crypt(req);
931 return crypto_aead_decrypt(req);
934 static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm)
936 struct crypto_instance *inst = (void *)tfm->__crt_alg;
937 struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
938 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
939 struct crypto_aead *aead;
942 aead = crypto_spawn_aead(spawn);
944 return PTR_ERR(aead);
948 align = crypto_aead_alignmask(aead);
949 align &= ~(crypto_tfm_ctx_alignment() - 1);
950 tfm->crt_aead.reqsize = sizeof(struct aead_request) +
951 ALIGN(crypto_aead_reqsize(aead),
952 crypto_tfm_ctx_alignment()) +
958 static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm)
960 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
962 crypto_free_aead(ctx->child);
965 static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
967 struct crypto_attr_type *algt;
968 struct crypto_instance *inst;
969 struct crypto_aead_spawn *spawn;
970 struct crypto_alg *alg;
971 const char *ccm_name;
974 algt = crypto_get_attr_type(tb);
979 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
980 return ERR_PTR(-EINVAL);
982 ccm_name = crypto_attr_alg_name(tb[1]);
983 err = PTR_ERR(ccm_name);
984 if (IS_ERR(ccm_name))
987 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
989 return ERR_PTR(-ENOMEM);
991 spawn = crypto_instance_ctx(inst);
992 crypto_set_aead_spawn(spawn, inst);
993 err = crypto_grab_aead(spawn, ccm_name, 0,
994 crypto_requires_sync(algt->type, algt->mask));
998 alg = crypto_aead_spawn_alg(spawn);
1002 /* We only support 16-byte blocks. */
1003 if (alg->cra_aead.ivsize != 16)
1006 /* Not a stream cipher? */
1007 if (alg->cra_blocksize != 1)
1010 err = -ENAMETOOLONG;
1011 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1012 "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1013 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1014 "rfc4106(%s)", alg->cra_driver_name) >=
1015 CRYPTO_MAX_ALG_NAME)
1018 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1019 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1020 inst->alg.cra_priority = alg->cra_priority;
1021 inst->alg.cra_blocksize = 1;
1022 inst->alg.cra_alignmask = alg->cra_alignmask;
1023 inst->alg.cra_type = &crypto_nivaead_type;
1025 inst->alg.cra_aead.ivsize = 8;
1026 inst->alg.cra_aead.maxauthsize = 16;
1028 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
1030 inst->alg.cra_init = crypto_rfc4106_init_tfm;
1031 inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
1033 inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
1034 inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
1035 inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
1036 inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
1038 inst->alg.cra_aead.geniv = "seqiv";
1044 crypto_drop_aead(spawn);
1047 inst = ERR_PTR(err);
1051 static void crypto_rfc4106_free(struct crypto_instance *inst)
1053 crypto_drop_spawn(crypto_instance_ctx(inst));
1057 static struct crypto_template crypto_rfc4106_tmpl = {
1059 .alloc = crypto_rfc4106_alloc,
1060 .free = crypto_rfc4106_free,
1061 .module = THIS_MODULE,
1064 static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_reqctx(
1065 struct aead_request *req)
1067 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
1069 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
1072 static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1073 unsigned int keylen)
1075 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1076 struct crypto_aead *child = ctx->child;
1083 memcpy(ctx->nonce, key + keylen, 4);
1085 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1086 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1087 CRYPTO_TFM_REQ_MASK);
1088 err = crypto_aead_setkey(child, key, keylen);
1089 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1090 CRYPTO_TFM_RES_MASK);
1095 static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1096 unsigned int authsize)
1098 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1103 return crypto_aead_setauthsize(ctx->child, authsize);
1106 static void crypto_rfc4543_done(struct crypto_async_request *areq, int err)
1108 struct aead_request *req = areq->data;
1109 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1110 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1113 scatterwalk_map_and_copy(rctx->auth_tag, req->dst,
1115 crypto_aead_authsize(aead), 1);
1118 aead_request_complete(req, err);
1121 static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
1124 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1125 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1126 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1127 struct aead_request *subreq = &rctx->subreq;
1128 struct scatterlist *dst = req->dst;
1129 struct scatterlist *cipher = rctx->cipher;
1130 struct scatterlist *payload = rctx->payload;
1131 struct scatterlist *assoc = rctx->assoc;
1132 unsigned int authsize = crypto_aead_authsize(aead);
1133 unsigned int assoclen = req->assoclen;
1136 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1137 crypto_aead_alignmask(ctx->child) + 1);
1139 memcpy(iv, ctx->nonce, 4);
1140 memcpy(iv + 4, req->iv, 8);
1142 /* construct cipher/plaintext */
1144 memset(rctx->auth_tag, 0, authsize);
1146 scatterwalk_map_and_copy(rctx->auth_tag, dst,
1147 req->cryptlen - authsize,
1150 sg_init_one(cipher, rctx->auth_tag, authsize);
1152 /* construct the aad */
1153 dstp = sg_page(dst);
1154 vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
1156 sg_init_table(payload, 2);
1157 sg_set_buf(payload, req->iv, 8);
1158 scatterwalk_crypto_chain(payload, dst, vdst == req->iv + 8, 2);
1159 assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
1161 if (req->assoc->length == req->assoclen) {
1162 sg_init_table(assoc, 2);
1163 sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
1164 req->assoc->offset);
1166 BUG_ON(req->assoclen > sizeof(rctx->assocbuf));
1168 scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0,
1171 sg_init_table(assoc, 2);
1172 sg_set_buf(assoc, rctx->assocbuf, req->assoclen);
1174 scatterwalk_crypto_chain(assoc, payload, 0, 2);
1176 aead_request_set_tfm(subreq, ctx->child);
1177 aead_request_set_callback(subreq, req->base.flags, crypto_rfc4543_done,
1180 aead_request_set_callback(subreq, req->base.flags,
1181 req->base.complete, req->base.data);
1182 aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
1183 aead_request_set_assoc(subreq, assoc, assoclen);
1188 static int crypto_rfc4543_encrypt(struct aead_request *req)
1190 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1191 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1192 struct aead_request *subreq;
1195 subreq = crypto_rfc4543_crypt(req, 1);
1196 err = crypto_aead_encrypt(subreq);
1200 scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
1201 crypto_aead_authsize(aead), 1);
1206 static int crypto_rfc4543_decrypt(struct aead_request *req)
1208 req = crypto_rfc4543_crypt(req, 0);
1210 return crypto_aead_decrypt(req);
1213 static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
1215 struct crypto_instance *inst = (void *)tfm->__crt_alg;
1216 struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
1217 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1218 struct crypto_aead *aead;
1219 unsigned long align;
1221 aead = crypto_spawn_aead(spawn);
1223 return PTR_ERR(aead);
1227 align = crypto_aead_alignmask(aead);
1228 align &= ~(crypto_tfm_ctx_alignment() - 1);
1229 tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
1230 ALIGN(crypto_aead_reqsize(aead),
1231 crypto_tfm_ctx_alignment()) +
1237 static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
1239 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1241 crypto_free_aead(ctx->child);
1244 static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
1246 struct crypto_attr_type *algt;
1247 struct crypto_instance *inst;
1248 struct crypto_aead_spawn *spawn;
1249 struct crypto_alg *alg;
1250 const char *ccm_name;
1253 algt = crypto_get_attr_type(tb);
1254 err = PTR_ERR(algt);
1256 return ERR_PTR(err);
1258 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1259 return ERR_PTR(-EINVAL);
1261 ccm_name = crypto_attr_alg_name(tb[1]);
1262 err = PTR_ERR(ccm_name);
1263 if (IS_ERR(ccm_name))
1264 return ERR_PTR(err);
1266 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
1268 return ERR_PTR(-ENOMEM);
1270 spawn = crypto_instance_ctx(inst);
1271 crypto_set_aead_spawn(spawn, inst);
1272 err = crypto_grab_aead(spawn, ccm_name, 0,
1273 crypto_requires_sync(algt->type, algt->mask));
1277 alg = crypto_aead_spawn_alg(spawn);
1281 /* We only support 16-byte blocks. */
1282 if (alg->cra_aead.ivsize != 16)
1285 /* Not a stream cipher? */
1286 if (alg->cra_blocksize != 1)
1289 err = -ENAMETOOLONG;
1290 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1291 "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1292 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1293 "rfc4543(%s)", alg->cra_driver_name) >=
1294 CRYPTO_MAX_ALG_NAME)
1297 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1298 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1299 inst->alg.cra_priority = alg->cra_priority;
1300 inst->alg.cra_blocksize = 1;
1301 inst->alg.cra_alignmask = alg->cra_alignmask;
1302 inst->alg.cra_type = &crypto_nivaead_type;
1304 inst->alg.cra_aead.ivsize = 8;
1305 inst->alg.cra_aead.maxauthsize = 16;
1307 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1309 inst->alg.cra_init = crypto_rfc4543_init_tfm;
1310 inst->alg.cra_exit = crypto_rfc4543_exit_tfm;
1312 inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
1313 inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
1314 inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
1315 inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt;
1317 inst->alg.cra_aead.geniv = "seqiv";
1323 crypto_drop_aead(spawn);
1326 inst = ERR_PTR(err);
1330 static void crypto_rfc4543_free(struct crypto_instance *inst)
1332 crypto_drop_spawn(crypto_instance_ctx(inst));
1336 static struct crypto_template crypto_rfc4543_tmpl = {
1338 .alloc = crypto_rfc4543_alloc,
1339 .free = crypto_rfc4543_free,
1340 .module = THIS_MODULE,
1343 static int __init crypto_gcm_module_init(void)
1347 gcm_zeroes = kzalloc(16, GFP_KERNEL);
1351 err = crypto_register_template(&crypto_gcm_base_tmpl);
1355 err = crypto_register_template(&crypto_gcm_tmpl);
1359 err = crypto_register_template(&crypto_rfc4106_tmpl);
1363 err = crypto_register_template(&crypto_rfc4543_tmpl);
1365 goto out_undo_rfc4106;
1370 crypto_unregister_template(&crypto_rfc4106_tmpl);
1372 crypto_unregister_template(&crypto_gcm_tmpl);
1374 crypto_unregister_template(&crypto_gcm_base_tmpl);
1380 static void __exit crypto_gcm_module_exit(void)
1383 crypto_unregister_template(&crypto_rfc4543_tmpl);
1384 crypto_unregister_template(&crypto_rfc4106_tmpl);
1385 crypto_unregister_template(&crypto_gcm_tmpl);
1386 crypto_unregister_template(&crypto_gcm_base_tmpl);
1389 module_init(crypto_gcm_module_init);
1390 module_exit(crypto_gcm_module_exit);
1392 MODULE_LICENSE("GPL");
1393 MODULE_DESCRIPTION("Galois/Counter Mode");
1394 MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1395 MODULE_ALIAS_CRYPTO("gcm_base");
1396 MODULE_ALIAS_CRYPTO("rfc4106");
1397 MODULE_ALIAS_CRYPTO("rfc4543");
1398 MODULE_ALIAS_CRYPTO("gcm");