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)
450 struct crypto_attr_type *algt;
452 struct aead_instance *inst;
453 struct ccm_instance_ctx *ictx;
454 struct skcipher_alg *ctr;
455 struct hash_alg_common *mac;
458 algt = crypto_get_attr_type(tb);
460 return PTR_ERR(algt);
462 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
465 mask = crypto_requires_sync(algt->type, algt->mask);
467 inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
470 ictx = aead_instance_ctx(inst);
472 err = crypto_grab_ahash(&ictx->mac, aead_crypto_instance(inst),
473 mac_name, 0, CRYPTO_ALG_ASYNC);
476 mac = crypto_spawn_ahash_alg(&ictx->mac);
479 if (strncmp(mac->base.cra_name, "cbcmac(", 7) != 0 ||
480 mac->digestsize != 16)
483 err = crypto_grab_skcipher(&ictx->ctr, aead_crypto_instance(inst),
487 ctr = crypto_spawn_skcipher_alg(&ictx->ctr);
489 /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
491 if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
492 crypto_skcipher_alg_ivsize(ctr) != 16 ||
493 ctr->base.cra_blocksize != 1)
496 /* ctr and cbcmac must use the same underlying block cipher. */
497 if (strcmp(ctr->base.cra_name + 4, mac->base.cra_name + 7) != 0)
501 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
502 "ccm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
505 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
506 "ccm_base(%s,%s)", ctr->base.cra_driver_name,
507 mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
510 inst->alg.base.cra_flags = ctr->base.cra_flags & CRYPTO_ALG_ASYNC;
511 inst->alg.base.cra_priority = (mac->base.cra_priority +
512 ctr->base.cra_priority) / 2;
513 inst->alg.base.cra_blocksize = 1;
514 inst->alg.base.cra_alignmask = mac->base.cra_alignmask |
515 ctr->base.cra_alignmask;
516 inst->alg.ivsize = 16;
517 inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
518 inst->alg.maxauthsize = 16;
519 inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx);
520 inst->alg.init = crypto_ccm_init_tfm;
521 inst->alg.exit = crypto_ccm_exit_tfm;
522 inst->alg.setkey = crypto_ccm_setkey;
523 inst->alg.setauthsize = crypto_ccm_setauthsize;
524 inst->alg.encrypt = crypto_ccm_encrypt;
525 inst->alg.decrypt = crypto_ccm_decrypt;
527 inst->free = crypto_ccm_free;
529 err = aead_register_instance(tmpl, inst);
532 crypto_ccm_free(inst);
537 static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb)
539 const char *cipher_name;
540 char ctr_name[CRYPTO_MAX_ALG_NAME];
541 char mac_name[CRYPTO_MAX_ALG_NAME];
543 cipher_name = crypto_attr_alg_name(tb[1]);
544 if (IS_ERR(cipher_name))
545 return PTR_ERR(cipher_name);
547 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)",
548 cipher_name) >= CRYPTO_MAX_ALG_NAME)
549 return -ENAMETOOLONG;
551 if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)",
552 cipher_name) >= CRYPTO_MAX_ALG_NAME)
553 return -ENAMETOOLONG;
555 return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name);
558 static int crypto_ccm_base_create(struct crypto_template *tmpl,
561 const char *ctr_name;
562 const char *mac_name;
564 ctr_name = crypto_attr_alg_name(tb[1]);
565 if (IS_ERR(ctr_name))
566 return PTR_ERR(ctr_name);
568 mac_name = crypto_attr_alg_name(tb[2]);
569 if (IS_ERR(mac_name))
570 return PTR_ERR(mac_name);
572 return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name);
575 static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key,
578 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
579 struct crypto_aead *child = ctx->child;
585 memcpy(ctx->nonce, key + keylen, 3);
587 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
588 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
589 CRYPTO_TFM_REQ_MASK);
590 return crypto_aead_setkey(child, key, keylen);
593 static int crypto_rfc4309_setauthsize(struct crypto_aead *parent,
594 unsigned int authsize)
596 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
607 return crypto_aead_setauthsize(ctx->child, authsize);
610 static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req)
612 struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req);
613 struct aead_request *subreq = &rctx->subreq;
614 struct crypto_aead *aead = crypto_aead_reqtfm(req);
615 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead);
616 struct crypto_aead *child = ctx->child;
617 struct scatterlist *sg;
618 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
619 crypto_aead_alignmask(child) + 1);
624 memcpy(iv + 1, ctx->nonce, 3);
625 memcpy(iv + 4, req->iv, 8);
627 scatterwalk_map_and_copy(iv + 16, req->src, 0, req->assoclen - 8, 0);
629 sg_init_table(rctx->src, 3);
630 sg_set_buf(rctx->src, iv + 16, req->assoclen - 8);
631 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
632 if (sg != rctx->src + 1)
633 sg_chain(rctx->src, 2, sg);
635 if (req->src != req->dst) {
636 sg_init_table(rctx->dst, 3);
637 sg_set_buf(rctx->dst, iv + 16, req->assoclen - 8);
638 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
639 if (sg != rctx->dst + 1)
640 sg_chain(rctx->dst, 2, sg);
643 aead_request_set_tfm(subreq, child);
644 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
646 aead_request_set_crypt(subreq, rctx->src,
647 req->src == req->dst ? rctx->src : rctx->dst,
649 aead_request_set_ad(subreq, req->assoclen - 8);
654 static int crypto_rfc4309_encrypt(struct aead_request *req)
656 if (req->assoclen != 16 && req->assoclen != 20)
659 req = crypto_rfc4309_crypt(req);
661 return crypto_aead_encrypt(req);
664 static int crypto_rfc4309_decrypt(struct aead_request *req)
666 if (req->assoclen != 16 && req->assoclen != 20)
669 req = crypto_rfc4309_crypt(req);
671 return crypto_aead_decrypt(req);
674 static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm)
676 struct aead_instance *inst = aead_alg_instance(tfm);
677 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
678 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
679 struct crypto_aead *aead;
682 aead = crypto_spawn_aead(spawn);
684 return PTR_ERR(aead);
688 align = crypto_aead_alignmask(aead);
689 align &= ~(crypto_tfm_ctx_alignment() - 1);
690 crypto_aead_set_reqsize(
692 sizeof(struct crypto_rfc4309_req_ctx) +
693 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
699 static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm)
701 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
703 crypto_free_aead(ctx->child);
706 static void crypto_rfc4309_free(struct aead_instance *inst)
708 crypto_drop_aead(aead_instance_ctx(inst));
712 static int crypto_rfc4309_create(struct crypto_template *tmpl,
715 struct crypto_attr_type *algt;
717 struct aead_instance *inst;
718 struct crypto_aead_spawn *spawn;
719 struct aead_alg *alg;
722 algt = crypto_get_attr_type(tb);
724 return PTR_ERR(algt);
726 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
729 mask = crypto_requires_sync(algt->type, algt->mask);
731 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
735 spawn = aead_instance_ctx(inst);
736 err = crypto_grab_aead(spawn, aead_crypto_instance(inst),
737 crypto_attr_alg_name(tb[1]), 0, mask);
741 alg = crypto_spawn_aead_alg(spawn);
745 /* We only support 16-byte blocks. */
746 if (crypto_aead_alg_ivsize(alg) != 16)
749 /* Not a stream cipher? */
750 if (alg->base.cra_blocksize != 1)
754 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
755 "rfc4309(%s)", alg->base.cra_name) >=
756 CRYPTO_MAX_ALG_NAME ||
757 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
758 "rfc4309(%s)", alg->base.cra_driver_name) >=
762 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
763 inst->alg.base.cra_priority = alg->base.cra_priority;
764 inst->alg.base.cra_blocksize = 1;
765 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
767 inst->alg.ivsize = 8;
768 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
769 inst->alg.maxauthsize = 16;
771 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx);
773 inst->alg.init = crypto_rfc4309_init_tfm;
774 inst->alg.exit = crypto_rfc4309_exit_tfm;
776 inst->alg.setkey = crypto_rfc4309_setkey;
777 inst->alg.setauthsize = crypto_rfc4309_setauthsize;
778 inst->alg.encrypt = crypto_rfc4309_encrypt;
779 inst->alg.decrypt = crypto_rfc4309_decrypt;
781 inst->free = crypto_rfc4309_free;
783 err = aead_register_instance(tmpl, inst);
786 crypto_rfc4309_free(inst);
791 static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent,
792 const u8 *inkey, unsigned int keylen)
794 struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(parent);
796 return crypto_cipher_setkey(ctx->child, inkey, keylen);
799 static int crypto_cbcmac_digest_init(struct shash_desc *pdesc)
801 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
802 int bs = crypto_shash_digestsize(pdesc->tfm);
803 u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs;
811 static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p,
814 struct crypto_shash *parent = pdesc->tfm;
815 struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
816 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
817 struct crypto_cipher *tfm = tctx->child;
818 int bs = crypto_shash_digestsize(parent);
819 u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
822 unsigned int l = min(len, bs - ctx->len);
824 crypto_xor(dg + ctx->len, p, l);
829 if (ctx->len == bs) {
830 crypto_cipher_encrypt_one(tfm, dg, dg);
838 static int crypto_cbcmac_digest_final(struct shash_desc *pdesc, u8 *out)
840 struct crypto_shash *parent = pdesc->tfm;
841 struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
842 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
843 struct crypto_cipher *tfm = tctx->child;
844 int bs = crypto_shash_digestsize(parent);
845 u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
848 crypto_cipher_encrypt_one(tfm, dg, dg);
854 static int cbcmac_init_tfm(struct crypto_tfm *tfm)
856 struct crypto_cipher *cipher;
857 struct crypto_instance *inst = (void *)tfm->__crt_alg;
858 struct crypto_cipher_spawn *spawn = crypto_instance_ctx(inst);
859 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
861 cipher = crypto_spawn_cipher(spawn);
863 return PTR_ERR(cipher);
870 static void cbcmac_exit_tfm(struct crypto_tfm *tfm)
872 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
873 crypto_free_cipher(ctx->child);
876 static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb)
878 struct shash_instance *inst;
879 struct crypto_cipher_spawn *spawn;
880 struct crypto_alg *alg;
883 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
887 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
890 spawn = shash_instance_ctx(inst);
892 err = crypto_grab_cipher(spawn, shash_crypto_instance(inst),
893 crypto_attr_alg_name(tb[1]), 0, 0);
896 alg = crypto_spawn_cipher_alg(spawn);
898 err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg);
902 inst->alg.base.cra_priority = alg->cra_priority;
903 inst->alg.base.cra_blocksize = 1;
905 inst->alg.digestsize = alg->cra_blocksize;
906 inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx),
907 alg->cra_alignmask + 1) +
910 inst->alg.base.cra_ctxsize = sizeof(struct cbcmac_tfm_ctx);
911 inst->alg.base.cra_init = cbcmac_init_tfm;
912 inst->alg.base.cra_exit = cbcmac_exit_tfm;
914 inst->alg.init = crypto_cbcmac_digest_init;
915 inst->alg.update = crypto_cbcmac_digest_update;
916 inst->alg.final = crypto_cbcmac_digest_final;
917 inst->alg.setkey = crypto_cbcmac_digest_setkey;
919 inst->free = shash_free_singlespawn_instance;
921 err = shash_register_instance(tmpl, inst);
924 shash_free_singlespawn_instance(inst);
929 static struct crypto_template crypto_ccm_tmpls[] = {
932 .create = cbcmac_create,
933 .module = THIS_MODULE,
936 .create = crypto_ccm_base_create,
937 .module = THIS_MODULE,
940 .create = crypto_ccm_create,
941 .module = THIS_MODULE,
944 .create = crypto_rfc4309_create,
945 .module = THIS_MODULE,
949 static int __init crypto_ccm_module_init(void)
951 return crypto_register_templates(crypto_ccm_tmpls,
952 ARRAY_SIZE(crypto_ccm_tmpls));
955 static void __exit crypto_ccm_module_exit(void)
957 crypto_unregister_templates(crypto_ccm_tmpls,
958 ARRAY_SIZE(crypto_ccm_tmpls));
961 subsys_initcall(crypto_ccm_module_init);
962 module_exit(crypto_ccm_module_exit);
964 MODULE_LICENSE("GPL");
965 MODULE_DESCRIPTION("Counter with CBC MAC");
966 MODULE_ALIAS_CRYPTO("ccm_base");
967 MODULE_ALIAS_CRYPTO("rfc4309");
968 MODULE_ALIAS_CRYPTO("ccm");
969 MODULE_ALIAS_CRYPTO("cbcmac");