1 // SPDX-License-Identifier: GPL-2.0-or-later
3 * CCM: Counter with CBC-MAC
5 * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
8 #include <crypto/internal/aead.h>
9 #include <crypto/internal/hash.h>
10 #include <crypto/internal/skcipher.h>
11 #include <crypto/scatterwalk.h>
12 #include <linux/err.h>
13 #include <linux/init.h>
14 #include <linux/kernel.h>
15 #include <linux/module.h>
16 #include <linux/slab.h>
18 struct ccm_instance_ctx {
19 struct crypto_skcipher_spawn ctr;
20 struct crypto_ahash_spawn mac;
23 struct crypto_ccm_ctx {
24 struct crypto_ahash *mac;
25 struct crypto_skcipher *ctr;
28 struct crypto_rfc4309_ctx {
29 struct crypto_aead *child;
33 struct crypto_rfc4309_req_ctx {
34 struct scatterlist src[3];
35 struct scatterlist dst[3];
36 struct aead_request subreq;
39 struct crypto_ccm_req_priv_ctx {
44 struct scatterlist src[3];
45 struct scatterlist dst[3];
47 struct ahash_request ahreq;
48 struct skcipher_request skreq;
52 struct cbcmac_tfm_ctx {
53 struct crypto_cipher *child;
56 struct cbcmac_desc_ctx {
60 static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx(
61 struct aead_request *req)
63 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
65 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
68 static int set_msg_len(u8 *block, unsigned int msglen, int csize)
72 memset(block, 0, csize);
77 else if (msglen > (1 << (8 * csize)))
80 data = cpu_to_be32(msglen);
81 memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
86 static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key,
89 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
90 struct crypto_skcipher *ctr = ctx->ctr;
91 struct crypto_ahash *mac = ctx->mac;
94 crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
95 crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
97 err = crypto_skcipher_setkey(ctr, key, keylen);
101 crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK);
102 crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) &
103 CRYPTO_TFM_REQ_MASK);
104 return crypto_ahash_setkey(mac, key, keylen);
107 static int crypto_ccm_setauthsize(struct crypto_aead *tfm,
108 unsigned int authsize)
126 static int format_input(u8 *info, struct aead_request *req,
127 unsigned int cryptlen)
129 struct crypto_aead *aead = crypto_aead_reqtfm(req);
130 unsigned int lp = req->iv[0];
131 unsigned int l = lp + 1;
134 m = crypto_aead_authsize(aead);
136 memcpy(info, req->iv, 16);
138 /* format control info per RFC 3610 and
139 * NIST Special Publication 800-38C
141 *info |= (8 * ((m - 2) / 2));
145 return set_msg_len(info + 16 - l, cryptlen, l);
148 static int format_adata(u8 *adata, unsigned int a)
152 /* add control info for associated data
153 * RFC 3610 and NIST Special Publication 800-38C
156 *(__be16 *)adata = cpu_to_be16(a);
159 *(__be16 *)adata = cpu_to_be16(0xfffe);
160 *(__be32 *)&adata[2] = cpu_to_be32(a);
167 static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain,
168 unsigned int cryptlen)
170 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
171 struct crypto_aead *aead = crypto_aead_reqtfm(req);
172 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
173 struct ahash_request *ahreq = &pctx->ahreq;
174 unsigned int assoclen = req->assoclen;
175 struct scatterlist sg[3];
176 u8 *odata = pctx->odata;
177 u8 *idata = pctx->idata;
180 /* format control data for input */
181 err = format_input(odata, req, cryptlen);
185 sg_init_table(sg, 3);
186 sg_set_buf(&sg[0], odata, 16);
188 /* format associated data and compute into mac */
190 ilen = format_adata(idata, assoclen);
191 sg_set_buf(&sg[1], idata, ilen);
192 sg_chain(sg, 3, req->src);
195 sg_chain(sg, 2, req->src);
198 ahash_request_set_tfm(ahreq, ctx->mac);
199 ahash_request_set_callback(ahreq, pctx->flags, NULL, NULL);
200 ahash_request_set_crypt(ahreq, sg, NULL, assoclen + ilen + 16);
201 err = crypto_ahash_init(ahreq);
204 err = crypto_ahash_update(ahreq);
208 /* we need to pad the MAC input to a round multiple of the block size */
209 ilen = 16 - (assoclen + ilen) % 16;
211 memset(idata, 0, ilen);
212 sg_init_table(sg, 2);
213 sg_set_buf(&sg[0], idata, ilen);
215 sg_chain(sg, 2, plain);
220 ahash_request_set_crypt(ahreq, plain, pctx->odata, cryptlen);
221 err = crypto_ahash_finup(ahreq);
226 static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err)
228 struct aead_request *req = areq->data;
229 struct crypto_aead *aead = crypto_aead_reqtfm(req);
230 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
231 u8 *odata = pctx->odata;
234 scatterwalk_map_and_copy(odata, req->dst,
235 req->assoclen + req->cryptlen,
236 crypto_aead_authsize(aead), 1);
237 aead_request_complete(req, err);
240 static inline int crypto_ccm_check_iv(const u8 *iv)
242 /* 2 <= L <= 8, so 1 <= L' <= 7. */
243 if (1 > iv[0] || iv[0] > 7)
249 static int crypto_ccm_init_crypt(struct aead_request *req, u8 *tag)
251 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
252 struct scatterlist *sg;
256 err = crypto_ccm_check_iv(iv);
260 pctx->flags = aead_request_flags(req);
262 /* Note: rfc 3610 and NIST 800-38C require counter of
263 * zero to encrypt auth tag.
265 memset(iv + 15 - iv[0], 0, iv[0] + 1);
267 sg_init_table(pctx->src, 3);
268 sg_set_buf(pctx->src, tag, 16);
269 sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
270 if (sg != pctx->src + 1)
271 sg_chain(pctx->src, 2, sg);
273 if (req->src != req->dst) {
274 sg_init_table(pctx->dst, 3);
275 sg_set_buf(pctx->dst, tag, 16);
276 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
277 if (sg != pctx->dst + 1)
278 sg_chain(pctx->dst, 2, sg);
284 static int crypto_ccm_encrypt(struct aead_request *req)
286 struct crypto_aead *aead = crypto_aead_reqtfm(req);
287 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
288 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
289 struct skcipher_request *skreq = &pctx->skreq;
290 struct scatterlist *dst;
291 unsigned int cryptlen = req->cryptlen;
292 u8 *odata = pctx->odata;
296 err = crypto_ccm_init_crypt(req, odata);
300 err = crypto_ccm_auth(req, sg_next(pctx->src), cryptlen);
305 if (req->src != req->dst)
308 skcipher_request_set_tfm(skreq, ctx->ctr);
309 skcipher_request_set_callback(skreq, pctx->flags,
310 crypto_ccm_encrypt_done, req);
311 skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
312 err = crypto_skcipher_encrypt(skreq);
316 /* copy authtag to end of dst */
317 scatterwalk_map_and_copy(odata, sg_next(dst), cryptlen,
318 crypto_aead_authsize(aead), 1);
322 static void crypto_ccm_decrypt_done(struct crypto_async_request *areq,
325 struct aead_request *req = areq->data;
326 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
327 struct crypto_aead *aead = crypto_aead_reqtfm(req);
328 unsigned int authsize = crypto_aead_authsize(aead);
329 unsigned int cryptlen = req->cryptlen - authsize;
330 struct scatterlist *dst;
334 dst = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
337 err = crypto_ccm_auth(req, dst, cryptlen);
338 if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize))
341 aead_request_complete(req, err);
344 static int crypto_ccm_decrypt(struct aead_request *req)
346 struct crypto_aead *aead = crypto_aead_reqtfm(req);
347 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
348 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
349 struct skcipher_request *skreq = &pctx->skreq;
350 struct scatterlist *dst;
351 unsigned int authsize = crypto_aead_authsize(aead);
352 unsigned int cryptlen = req->cryptlen;
353 u8 *authtag = pctx->auth_tag;
354 u8 *odata = pctx->odata;
355 u8 *iv = pctx->idata;
358 cryptlen -= authsize;
360 err = crypto_ccm_init_crypt(req, authtag);
364 scatterwalk_map_and_copy(authtag, sg_next(pctx->src), cryptlen,
368 if (req->src != req->dst)
371 memcpy(iv, req->iv, 16);
373 skcipher_request_set_tfm(skreq, ctx->ctr);
374 skcipher_request_set_callback(skreq, pctx->flags,
375 crypto_ccm_decrypt_done, req);
376 skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
377 err = crypto_skcipher_decrypt(skreq);
381 err = crypto_ccm_auth(req, sg_next(dst), cryptlen);
386 if (crypto_memneq(authtag, odata, authsize))
392 static int crypto_ccm_init_tfm(struct crypto_aead *tfm)
394 struct aead_instance *inst = aead_alg_instance(tfm);
395 struct ccm_instance_ctx *ictx = aead_instance_ctx(inst);
396 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
397 struct crypto_ahash *mac;
398 struct crypto_skcipher *ctr;
402 mac = crypto_spawn_ahash(&ictx->mac);
406 ctr = crypto_spawn_skcipher(&ictx->ctr);
414 align = crypto_aead_alignmask(tfm);
415 align &= ~(crypto_tfm_ctx_alignment() - 1);
416 crypto_aead_set_reqsize(
418 align + sizeof(struct crypto_ccm_req_priv_ctx) +
419 max(crypto_ahash_reqsize(mac), crypto_skcipher_reqsize(ctr)));
424 crypto_free_ahash(mac);
428 static void crypto_ccm_exit_tfm(struct crypto_aead *tfm)
430 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
432 crypto_free_ahash(ctx->mac);
433 crypto_free_skcipher(ctx->ctr);
436 static void crypto_ccm_free(struct aead_instance *inst)
438 struct ccm_instance_ctx *ctx = aead_instance_ctx(inst);
440 crypto_drop_ahash(&ctx->mac);
441 crypto_drop_skcipher(&ctx->ctr);
445 static int crypto_ccm_create_common(struct crypto_template *tmpl,
447 const char *ctr_name,
448 const char *mac_name)
451 struct aead_instance *inst;
452 struct ccm_instance_ctx *ictx;
453 struct skcipher_alg *ctr;
454 struct hash_alg_common *mac;
457 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
461 inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
464 ictx = aead_instance_ctx(inst);
466 err = crypto_grab_ahash(&ictx->mac, aead_crypto_instance(inst),
467 mac_name, 0, mask | CRYPTO_ALG_ASYNC);
470 mac = crypto_spawn_ahash_alg(&ictx->mac);
473 if (strncmp(mac->base.cra_name, "cbcmac(", 7) != 0 ||
474 mac->digestsize != 16)
477 err = crypto_grab_skcipher(&ictx->ctr, aead_crypto_instance(inst),
481 ctr = crypto_spawn_skcipher_alg(&ictx->ctr);
483 /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
485 if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
486 crypto_skcipher_alg_ivsize(ctr) != 16 ||
487 ctr->base.cra_blocksize != 1)
490 /* ctr and cbcmac must use the same underlying block cipher. */
491 if (strcmp(ctr->base.cra_name + 4, mac->base.cra_name + 7) != 0)
495 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
496 "ccm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
499 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
500 "ccm_base(%s,%s)", ctr->base.cra_driver_name,
501 mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
504 inst->alg.base.cra_priority = (mac->base.cra_priority +
505 ctr->base.cra_priority) / 2;
506 inst->alg.base.cra_blocksize = 1;
507 inst->alg.base.cra_alignmask = mac->base.cra_alignmask |
508 ctr->base.cra_alignmask;
509 inst->alg.ivsize = 16;
510 inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
511 inst->alg.maxauthsize = 16;
512 inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx);
513 inst->alg.init = crypto_ccm_init_tfm;
514 inst->alg.exit = crypto_ccm_exit_tfm;
515 inst->alg.setkey = crypto_ccm_setkey;
516 inst->alg.setauthsize = crypto_ccm_setauthsize;
517 inst->alg.encrypt = crypto_ccm_encrypt;
518 inst->alg.decrypt = crypto_ccm_decrypt;
520 inst->free = crypto_ccm_free;
522 err = aead_register_instance(tmpl, inst);
525 crypto_ccm_free(inst);
530 static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb)
532 const char *cipher_name;
533 char ctr_name[CRYPTO_MAX_ALG_NAME];
534 char mac_name[CRYPTO_MAX_ALG_NAME];
536 cipher_name = crypto_attr_alg_name(tb[1]);
537 if (IS_ERR(cipher_name))
538 return PTR_ERR(cipher_name);
540 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)",
541 cipher_name) >= CRYPTO_MAX_ALG_NAME)
542 return -ENAMETOOLONG;
544 if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)",
545 cipher_name) >= CRYPTO_MAX_ALG_NAME)
546 return -ENAMETOOLONG;
548 return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name);
551 static int crypto_ccm_base_create(struct crypto_template *tmpl,
554 const char *ctr_name;
555 const char *mac_name;
557 ctr_name = crypto_attr_alg_name(tb[1]);
558 if (IS_ERR(ctr_name))
559 return PTR_ERR(ctr_name);
561 mac_name = crypto_attr_alg_name(tb[2]);
562 if (IS_ERR(mac_name))
563 return PTR_ERR(mac_name);
565 return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name);
568 static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key,
571 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
572 struct crypto_aead *child = ctx->child;
578 memcpy(ctx->nonce, key + keylen, 3);
580 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
581 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
582 CRYPTO_TFM_REQ_MASK);
583 return crypto_aead_setkey(child, key, keylen);
586 static int crypto_rfc4309_setauthsize(struct crypto_aead *parent,
587 unsigned int authsize)
589 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
600 return crypto_aead_setauthsize(ctx->child, authsize);
603 static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req)
605 struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req);
606 struct aead_request *subreq = &rctx->subreq;
607 struct crypto_aead *aead = crypto_aead_reqtfm(req);
608 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead);
609 struct crypto_aead *child = ctx->child;
610 struct scatterlist *sg;
611 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
612 crypto_aead_alignmask(child) + 1);
617 memcpy(iv + 1, ctx->nonce, 3);
618 memcpy(iv + 4, req->iv, 8);
620 scatterwalk_map_and_copy(iv + 16, req->src, 0, req->assoclen - 8, 0);
622 sg_init_table(rctx->src, 3);
623 sg_set_buf(rctx->src, iv + 16, req->assoclen - 8);
624 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
625 if (sg != rctx->src + 1)
626 sg_chain(rctx->src, 2, sg);
628 if (req->src != req->dst) {
629 sg_init_table(rctx->dst, 3);
630 sg_set_buf(rctx->dst, iv + 16, req->assoclen - 8);
631 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
632 if (sg != rctx->dst + 1)
633 sg_chain(rctx->dst, 2, sg);
636 aead_request_set_tfm(subreq, child);
637 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
639 aead_request_set_crypt(subreq, rctx->src,
640 req->src == req->dst ? rctx->src : rctx->dst,
642 aead_request_set_ad(subreq, req->assoclen - 8);
647 static int crypto_rfc4309_encrypt(struct aead_request *req)
649 if (req->assoclen != 16 && req->assoclen != 20)
652 req = crypto_rfc4309_crypt(req);
654 return crypto_aead_encrypt(req);
657 static int crypto_rfc4309_decrypt(struct aead_request *req)
659 if (req->assoclen != 16 && req->assoclen != 20)
662 req = crypto_rfc4309_crypt(req);
664 return crypto_aead_decrypt(req);
667 static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm)
669 struct aead_instance *inst = aead_alg_instance(tfm);
670 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
671 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
672 struct crypto_aead *aead;
675 aead = crypto_spawn_aead(spawn);
677 return PTR_ERR(aead);
681 align = crypto_aead_alignmask(aead);
682 align &= ~(crypto_tfm_ctx_alignment() - 1);
683 crypto_aead_set_reqsize(
685 sizeof(struct crypto_rfc4309_req_ctx) +
686 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
692 static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm)
694 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
696 crypto_free_aead(ctx->child);
699 static void crypto_rfc4309_free(struct aead_instance *inst)
701 crypto_drop_aead(aead_instance_ctx(inst));
705 static int crypto_rfc4309_create(struct crypto_template *tmpl,
709 struct aead_instance *inst;
710 struct crypto_aead_spawn *spawn;
711 struct aead_alg *alg;
714 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask);
718 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
722 spawn = aead_instance_ctx(inst);
723 err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
724 crypto_attr_alg_name(tb[1]), 0, mask);
728 alg = crypto_spawn_aead_alg(spawn);
732 /* We only support 16-byte blocks. */
733 if (crypto_aead_alg_ivsize(alg) != 16)
736 /* Not a stream cipher? */
737 if (alg->base.cra_blocksize != 1)
741 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
742 "rfc4309(%s)", alg->base.cra_name) >=
743 CRYPTO_MAX_ALG_NAME ||
744 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
745 "rfc4309(%s)", alg->base.cra_driver_name) >=
749 inst->alg.base.cra_priority = alg->base.cra_priority;
750 inst->alg.base.cra_blocksize = 1;
751 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
753 inst->alg.ivsize = 8;
754 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
755 inst->alg.maxauthsize = 16;
757 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx);
759 inst->alg.init = crypto_rfc4309_init_tfm;
760 inst->alg.exit = crypto_rfc4309_exit_tfm;
762 inst->alg.setkey = crypto_rfc4309_setkey;
763 inst->alg.setauthsize = crypto_rfc4309_setauthsize;
764 inst->alg.encrypt = crypto_rfc4309_encrypt;
765 inst->alg.decrypt = crypto_rfc4309_decrypt;
767 inst->free = crypto_rfc4309_free;
769 err = aead_register_instance(tmpl, inst);
772 crypto_rfc4309_free(inst);
777 static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent,
778 const u8 *inkey, unsigned int keylen)
780 struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(parent);
782 return crypto_cipher_setkey(ctx->child, inkey, keylen);
785 static int crypto_cbcmac_digest_init(struct shash_desc *pdesc)
787 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
788 int bs = crypto_shash_digestsize(pdesc->tfm);
789 u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs;
797 static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p,
800 struct crypto_shash *parent = pdesc->tfm;
801 struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
802 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
803 struct crypto_cipher *tfm = tctx->child;
804 int bs = crypto_shash_digestsize(parent);
805 u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
808 unsigned int l = min(len, bs - ctx->len);
810 crypto_xor(dg + ctx->len, p, l);
815 if (ctx->len == bs) {
816 crypto_cipher_encrypt_one(tfm, dg, dg);
824 static int crypto_cbcmac_digest_final(struct shash_desc *pdesc, u8 *out)
826 struct crypto_shash *parent = pdesc->tfm;
827 struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
828 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
829 struct crypto_cipher *tfm = tctx->child;
830 int bs = crypto_shash_digestsize(parent);
831 u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
834 crypto_cipher_encrypt_one(tfm, dg, dg);
840 static int cbcmac_init_tfm(struct crypto_tfm *tfm)
842 struct crypto_cipher *cipher;
843 struct crypto_instance *inst = (void *)tfm->__crt_alg;
844 struct crypto_cipher_spawn *spawn = crypto_instance_ctx(inst);
845 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
847 cipher = crypto_spawn_cipher(spawn);
849 return PTR_ERR(cipher);
856 static void cbcmac_exit_tfm(struct crypto_tfm *tfm)
858 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
859 crypto_free_cipher(ctx->child);
862 static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb)
864 struct shash_instance *inst;
865 struct crypto_cipher_spawn *spawn;
866 struct crypto_alg *alg;
870 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask);
874 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
877 spawn = shash_instance_ctx(inst);
879 err = crypto_grab_cipher(spawn, shash_crypto_instance(inst),
880 crypto_attr_alg_name(tb[1]), 0, mask);
883 alg = crypto_spawn_cipher_alg(spawn);
885 err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg);
889 inst->alg.base.cra_priority = alg->cra_priority;
890 inst->alg.base.cra_blocksize = 1;
892 inst->alg.digestsize = alg->cra_blocksize;
893 inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx),
894 alg->cra_alignmask + 1) +
897 inst->alg.base.cra_ctxsize = sizeof(struct cbcmac_tfm_ctx);
898 inst->alg.base.cra_init = cbcmac_init_tfm;
899 inst->alg.base.cra_exit = cbcmac_exit_tfm;
901 inst->alg.init = crypto_cbcmac_digest_init;
902 inst->alg.update = crypto_cbcmac_digest_update;
903 inst->alg.final = crypto_cbcmac_digest_final;
904 inst->alg.setkey = crypto_cbcmac_digest_setkey;
906 inst->free = shash_free_singlespawn_instance;
908 err = shash_register_instance(tmpl, inst);
911 shash_free_singlespawn_instance(inst);
916 static struct crypto_template crypto_ccm_tmpls[] = {
919 .create = cbcmac_create,
920 .module = THIS_MODULE,
923 .create = crypto_ccm_base_create,
924 .module = THIS_MODULE,
927 .create = crypto_ccm_create,
928 .module = THIS_MODULE,
931 .create = crypto_rfc4309_create,
932 .module = THIS_MODULE,
936 static int __init crypto_ccm_module_init(void)
938 return crypto_register_templates(crypto_ccm_tmpls,
939 ARRAY_SIZE(crypto_ccm_tmpls));
942 static void __exit crypto_ccm_module_exit(void)
944 crypto_unregister_templates(crypto_ccm_tmpls,
945 ARRAY_SIZE(crypto_ccm_tmpls));
948 subsys_initcall(crypto_ccm_module_init);
949 module_exit(crypto_ccm_module_exit);
951 MODULE_LICENSE("GPL");
952 MODULE_DESCRIPTION("Counter with CBC MAC");
953 MODULE_ALIAS_CRYPTO("ccm_base");
954 MODULE_ALIAS_CRYPTO("rfc4309");
955 MODULE_ALIAS_CRYPTO("ccm");
956 MODULE_ALIAS_CRYPTO("cbcmac");