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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * CCM: Counter with CBC-MAC
4 *
5 * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
6 */
7
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>
17
18#include "internal.h"
19
20struct ccm_instance_ctx {
21 struct crypto_skcipher_spawn ctr;
22 struct crypto_ahash_spawn mac;
23};
24
25struct crypto_ccm_ctx {
26 struct crypto_ahash *mac;
27 struct crypto_skcipher *ctr;
28};
29
30struct crypto_rfc4309_ctx {
31 struct crypto_aead *child;
32 u8 nonce[3];
33};
34
35struct crypto_rfc4309_req_ctx {
36 struct scatterlist src[3];
37 struct scatterlist dst[3];
38 struct aead_request subreq;
39};
40
41struct crypto_ccm_req_priv_ctx {
42 u8 odata[16];
43 u8 idata[16];
44 u8 auth_tag[16];
45 u32 flags;
46 struct scatterlist src[3];
47 struct scatterlist dst[3];
48 union {
49 struct ahash_request ahreq;
50 struct skcipher_request skreq;
51 };
52};
53
54struct cbcmac_tfm_ctx {
55 struct crypto_cipher *child;
56};
57
58struct cbcmac_desc_ctx {
59 unsigned int len;
60};
61
62static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx(
63 struct aead_request *req)
64{
65 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
66
67 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
68}
69
70static int set_msg_len(u8 *block, unsigned int msglen, int csize)
71{
72 __be32 data;
73
74 memset(block, 0, csize);
75 block += csize;
76
77 if (csize >= 4)
78 csize = 4;
79 else if (msglen > (1 << (8 * csize)))
80 return -EOVERFLOW;
81
82 data = cpu_to_be32(msglen);
83 memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
84
85 return 0;
86}
87
88static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key,
89 unsigned int keylen)
90{
91 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
92 struct crypto_skcipher *ctr = ctx->ctr;
93 struct crypto_ahash *mac = ctx->mac;
94 int err = 0;
95
96 crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
97 crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
98 CRYPTO_TFM_REQ_MASK);
99 err = crypto_skcipher_setkey(ctr, key, keylen);
100 crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
101 CRYPTO_TFM_RES_MASK);
102 if (err)
103 goto out;
104
105 crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK);
106 crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) &
107 CRYPTO_TFM_REQ_MASK);
108 err = crypto_ahash_setkey(mac, key, keylen);
109 crypto_aead_set_flags(aead, crypto_ahash_get_flags(mac) &
110 CRYPTO_TFM_RES_MASK);
111
112out:
113 return err;
114}
115
116static int crypto_ccm_setauthsize(struct crypto_aead *tfm,
117 unsigned int authsize)
118{
119 switch (authsize) {
120 case 4:
121 case 6:
122 case 8:
123 case 10:
124 case 12:
125 case 14:
126 case 16:
127 break;
128 default:
129 return -EINVAL;
130 }
131
132 return 0;
133}
134
135static int format_input(u8 *info, struct aead_request *req,
136 unsigned int cryptlen)
137{
138 struct crypto_aead *aead = crypto_aead_reqtfm(req);
139 unsigned int lp = req->iv[0];
140 unsigned int l = lp + 1;
141 unsigned int m;
142
143 m = crypto_aead_authsize(aead);
144
145 memcpy(info, req->iv, 16);
146
147 /* format control info per RFC 3610 and
148 * NIST Special Publication 800-38C
149 */
150 *info |= (8 * ((m - 2) / 2));
151 if (req->assoclen)
152 *info |= 64;
153
154 return set_msg_len(info + 16 - l, cryptlen, l);
155}
156
157static int format_adata(u8 *adata, unsigned int a)
158{
159 int len = 0;
160
161 /* add control info for associated data
162 * RFC 3610 and NIST Special Publication 800-38C
163 */
164 if (a < 65280) {
165 *(__be16 *)adata = cpu_to_be16(a);
166 len = 2;
167 } else {
168 *(__be16 *)adata = cpu_to_be16(0xfffe);
169 *(__be32 *)&adata[2] = cpu_to_be32(a);
170 len = 6;
171 }
172
173 return len;
174}
175
176static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain,
177 unsigned int cryptlen)
178{
179 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
180 struct crypto_aead *aead = crypto_aead_reqtfm(req);
181 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
182 struct ahash_request *ahreq = &pctx->ahreq;
183 unsigned int assoclen = req->assoclen;
184 struct scatterlist sg[3];
185 u8 *odata = pctx->odata;
186 u8 *idata = pctx->idata;
187 int ilen, err;
188
189 /* format control data for input */
190 err = format_input(odata, req, cryptlen);
191 if (err)
192 goto out;
193
194 sg_init_table(sg, 3);
195 sg_set_buf(&sg[0], odata, 16);
196
197 /* format associated data and compute into mac */
198 if (assoclen) {
199 ilen = format_adata(idata, assoclen);
200 sg_set_buf(&sg[1], idata, ilen);
201 sg_chain(sg, 3, req->src);
202 } else {
203 ilen = 0;
204 sg_chain(sg, 2, req->src);
205 }
206
207 ahash_request_set_tfm(ahreq, ctx->mac);
208 ahash_request_set_callback(ahreq, pctx->flags, NULL, NULL);
209 ahash_request_set_crypt(ahreq, sg, NULL, assoclen + ilen + 16);
210 err = crypto_ahash_init(ahreq);
211 if (err)
212 goto out;
213 err = crypto_ahash_update(ahreq);
214 if (err)
215 goto out;
216
217 /* we need to pad the MAC input to a round multiple of the block size */
218 ilen = 16 - (assoclen + ilen) % 16;
219 if (ilen < 16) {
220 memset(idata, 0, ilen);
221 sg_init_table(sg, 2);
222 sg_set_buf(&sg[0], idata, ilen);
223 if (plain)
224 sg_chain(sg, 2, plain);
225 plain = sg;
226 cryptlen += ilen;
227 }
228
229 ahash_request_set_crypt(ahreq, plain, pctx->odata, cryptlen);
230 err = crypto_ahash_finup(ahreq);
231out:
232 return err;
233}
234
235static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err)
236{
237 struct aead_request *req = areq->data;
238 struct crypto_aead *aead = crypto_aead_reqtfm(req);
239 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
240 u8 *odata = pctx->odata;
241
242 if (!err)
243 scatterwalk_map_and_copy(odata, req->dst,
244 req->assoclen + req->cryptlen,
245 crypto_aead_authsize(aead), 1);
246 aead_request_complete(req, err);
247}
248
249static inline int crypto_ccm_check_iv(const u8 *iv)
250{
251 /* 2 <= L <= 8, so 1 <= L' <= 7. */
252 if (1 > iv[0] || iv[0] > 7)
253 return -EINVAL;
254
255 return 0;
256}
257
258static int crypto_ccm_init_crypt(struct aead_request *req, u8 *tag)
259{
260 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
261 struct scatterlist *sg;
262 u8 *iv = req->iv;
263 int err;
264
265 err = crypto_ccm_check_iv(iv);
266 if (err)
267 return err;
268
269 pctx->flags = aead_request_flags(req);
270
271 /* Note: rfc 3610 and NIST 800-38C require counter of
272 * zero to encrypt auth tag.
273 */
274 memset(iv + 15 - iv[0], 0, iv[0] + 1);
275
276 sg_init_table(pctx->src, 3);
277 sg_set_buf(pctx->src, tag, 16);
278 sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
279 if (sg != pctx->src + 1)
280 sg_chain(pctx->src, 2, sg);
281
282 if (req->src != req->dst) {
283 sg_init_table(pctx->dst, 3);
284 sg_set_buf(pctx->dst, tag, 16);
285 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
286 if (sg != pctx->dst + 1)
287 sg_chain(pctx->dst, 2, sg);
288 }
289
290 return 0;
291}
292
293static int crypto_ccm_encrypt(struct aead_request *req)
294{
295 struct crypto_aead *aead = crypto_aead_reqtfm(req);
296 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
297 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
298 struct skcipher_request *skreq = &pctx->skreq;
299 struct scatterlist *dst;
300 unsigned int cryptlen = req->cryptlen;
301 u8 *odata = pctx->odata;
302 u8 *iv = req->iv;
303 int err;
304
305 err = crypto_ccm_init_crypt(req, odata);
306 if (err)
307 return err;
308
309 err = crypto_ccm_auth(req, sg_next(pctx->src), cryptlen);
310 if (err)
311 return err;
312
313 dst = pctx->src;
314 if (req->src != req->dst)
315 dst = pctx->dst;
316
317 skcipher_request_set_tfm(skreq, ctx->ctr);
318 skcipher_request_set_callback(skreq, pctx->flags,
319 crypto_ccm_encrypt_done, req);
320 skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
321 err = crypto_skcipher_encrypt(skreq);
322 if (err)
323 return err;
324
325 /* copy authtag to end of dst */
326 scatterwalk_map_and_copy(odata, sg_next(dst), cryptlen,
327 crypto_aead_authsize(aead), 1);
328 return err;
329}
330
331static void crypto_ccm_decrypt_done(struct crypto_async_request *areq,
332 int err)
333{
334 struct aead_request *req = areq->data;
335 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
336 struct crypto_aead *aead = crypto_aead_reqtfm(req);
337 unsigned int authsize = crypto_aead_authsize(aead);
338 unsigned int cryptlen = req->cryptlen - authsize;
339 struct scatterlist *dst;
340
341 pctx->flags = 0;
342
343 dst = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
344
345 if (!err) {
346 err = crypto_ccm_auth(req, dst, cryptlen);
347 if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize))
348 err = -EBADMSG;
349 }
350 aead_request_complete(req, err);
351}
352
353static int crypto_ccm_decrypt(struct aead_request *req)
354{
355 struct crypto_aead *aead = crypto_aead_reqtfm(req);
356 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
357 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
358 struct skcipher_request *skreq = &pctx->skreq;
359 struct scatterlist *dst;
360 unsigned int authsize = crypto_aead_authsize(aead);
361 unsigned int cryptlen = req->cryptlen;
362 u8 *authtag = pctx->auth_tag;
363 u8 *odata = pctx->odata;
364 u8 *iv = pctx->idata;
365 int err;
366
367 cryptlen -= authsize;
368
369 err = crypto_ccm_init_crypt(req, authtag);
370 if (err)
371 return err;
372
373 scatterwalk_map_and_copy(authtag, sg_next(pctx->src), cryptlen,
374 authsize, 0);
375
376 dst = pctx->src;
377 if (req->src != req->dst)
378 dst = pctx->dst;
379
380 memcpy(iv, req->iv, 16);
381
382 skcipher_request_set_tfm(skreq, ctx->ctr);
383 skcipher_request_set_callback(skreq, pctx->flags,
384 crypto_ccm_decrypt_done, req);
385 skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
386 err = crypto_skcipher_decrypt(skreq);
387 if (err)
388 return err;
389
390 err = crypto_ccm_auth(req, sg_next(dst), cryptlen);
391 if (err)
392 return err;
393
394 /* verify */
395 if (crypto_memneq(authtag, odata, authsize))
396 return -EBADMSG;
397
398 return err;
399}
400
401static int crypto_ccm_init_tfm(struct crypto_aead *tfm)
402{
403 struct aead_instance *inst = aead_alg_instance(tfm);
404 struct ccm_instance_ctx *ictx = aead_instance_ctx(inst);
405 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
406 struct crypto_ahash *mac;
407 struct crypto_skcipher *ctr;
408 unsigned long align;
409 int err;
410
411 mac = crypto_spawn_ahash(&ictx->mac);
412 if (IS_ERR(mac))
413 return PTR_ERR(mac);
414
415 ctr = crypto_spawn_skcipher(&ictx->ctr);
416 err = PTR_ERR(ctr);
417 if (IS_ERR(ctr))
418 goto err_free_mac;
419
420 ctx->mac = mac;
421 ctx->ctr = ctr;
422
423 align = crypto_aead_alignmask(tfm);
424 align &= ~(crypto_tfm_ctx_alignment() - 1);
425 crypto_aead_set_reqsize(
426 tfm,
427 align + sizeof(struct crypto_ccm_req_priv_ctx) +
428 max(crypto_ahash_reqsize(mac), crypto_skcipher_reqsize(ctr)));
429
430 return 0;
431
432err_free_mac:
433 crypto_free_ahash(mac);
434 return err;
435}
436
437static void crypto_ccm_exit_tfm(struct crypto_aead *tfm)
438{
439 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
440
441 crypto_free_ahash(ctx->mac);
442 crypto_free_skcipher(ctx->ctr);
443}
444
445static void crypto_ccm_free(struct aead_instance *inst)
446{
447 struct ccm_instance_ctx *ctx = aead_instance_ctx(inst);
448
449 crypto_drop_ahash(&ctx->mac);
450 crypto_drop_skcipher(&ctx->ctr);
451 kfree(inst);
452}
453
454static int crypto_ccm_create_common(struct crypto_template *tmpl,
455 struct rtattr **tb,
456 const char *ctr_name,
457 const char *mac_name)
458{
459 struct crypto_attr_type *algt;
460 struct aead_instance *inst;
461 struct skcipher_alg *ctr;
462 struct crypto_alg *mac_alg;
463 struct hash_alg_common *mac;
464 struct ccm_instance_ctx *ictx;
465 int err;
466
467 algt = crypto_get_attr_type(tb);
468 if (IS_ERR(algt))
469 return PTR_ERR(algt);
470
471 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
472 return -EINVAL;
473
474 mac_alg = crypto_find_alg(mac_name, &crypto_ahash_type,
475 CRYPTO_ALG_TYPE_HASH,
476 CRYPTO_ALG_TYPE_AHASH_MASK |
477 CRYPTO_ALG_ASYNC);
478 if (IS_ERR(mac_alg))
479 return PTR_ERR(mac_alg);
480
481 mac = __crypto_hash_alg_common(mac_alg);
482 err = -EINVAL;
483 if (strncmp(mac->base.cra_name, "cbcmac(", 7) != 0 ||
484 mac->digestsize != 16)
485 goto out_put_mac;
486
487 inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
488 err = -ENOMEM;
489 if (!inst)
490 goto out_put_mac;
491
492 ictx = aead_instance_ctx(inst);
493 err = crypto_init_ahash_spawn(&ictx->mac, mac,
494 aead_crypto_instance(inst));
495 if (err)
496 goto err_free_inst;
497
498 crypto_set_skcipher_spawn(&ictx->ctr, aead_crypto_instance(inst));
499 err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0,
500 crypto_requires_sync(algt->type,
501 algt->mask));
502 if (err)
503 goto err_drop_mac;
504
505 ctr = crypto_spawn_skcipher_alg(&ictx->ctr);
506
507 /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
508 err = -EINVAL;
509 if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
510 crypto_skcipher_alg_ivsize(ctr) != 16 ||
511 ctr->base.cra_blocksize != 1)
512 goto err_drop_ctr;
513
514 /* ctr and cbcmac must use the same underlying block cipher. */
515 if (strcmp(ctr->base.cra_name + 4, mac->base.cra_name + 7) != 0)
516 goto err_drop_ctr;
517
518 err = -ENAMETOOLONG;
519 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
520 "ccm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
521 goto err_drop_ctr;
522
523 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
524 "ccm_base(%s,%s)", ctr->base.cra_driver_name,
525 mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
526 goto err_drop_ctr;
527
528 inst->alg.base.cra_flags = ctr->base.cra_flags & CRYPTO_ALG_ASYNC;
529 inst->alg.base.cra_priority = (mac->base.cra_priority +
530 ctr->base.cra_priority) / 2;
531 inst->alg.base.cra_blocksize = 1;
532 inst->alg.base.cra_alignmask = mac->base.cra_alignmask |
533 ctr->base.cra_alignmask;
534 inst->alg.ivsize = 16;
535 inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
536 inst->alg.maxauthsize = 16;
537 inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx);
538 inst->alg.init = crypto_ccm_init_tfm;
539 inst->alg.exit = crypto_ccm_exit_tfm;
540 inst->alg.setkey = crypto_ccm_setkey;
541 inst->alg.setauthsize = crypto_ccm_setauthsize;
542 inst->alg.encrypt = crypto_ccm_encrypt;
543 inst->alg.decrypt = crypto_ccm_decrypt;
544
545 inst->free = crypto_ccm_free;
546
547 err = aead_register_instance(tmpl, inst);
548 if (err)
549 goto err_drop_ctr;
550
551out_put_mac:
552 crypto_mod_put(mac_alg);
553 return err;
554
555err_drop_ctr:
556 crypto_drop_skcipher(&ictx->ctr);
557err_drop_mac:
558 crypto_drop_ahash(&ictx->mac);
559err_free_inst:
560 kfree(inst);
561 goto out_put_mac;
562}
563
564static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb)
565{
566 const char *cipher_name;
567 char ctr_name[CRYPTO_MAX_ALG_NAME];
568 char mac_name[CRYPTO_MAX_ALG_NAME];
569
570 cipher_name = crypto_attr_alg_name(tb[1]);
571 if (IS_ERR(cipher_name))
572 return PTR_ERR(cipher_name);
573
574 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)",
575 cipher_name) >= CRYPTO_MAX_ALG_NAME)
576 return -ENAMETOOLONG;
577
578 if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)",
579 cipher_name) >= CRYPTO_MAX_ALG_NAME)
580 return -ENAMETOOLONG;
581
582 return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name);
583}
584
585static int crypto_ccm_base_create(struct crypto_template *tmpl,
586 struct rtattr **tb)
587{
588 const char *ctr_name;
589 const char *mac_name;
590
591 ctr_name = crypto_attr_alg_name(tb[1]);
592 if (IS_ERR(ctr_name))
593 return PTR_ERR(ctr_name);
594
595 mac_name = crypto_attr_alg_name(tb[2]);
596 if (IS_ERR(mac_name))
597 return PTR_ERR(mac_name);
598
599 return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name);
600}
601
602static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key,
603 unsigned int keylen)
604{
605 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
606 struct crypto_aead *child = ctx->child;
607 int err;
608
609 if (keylen < 3)
610 return -EINVAL;
611
612 keylen -= 3;
613 memcpy(ctx->nonce, key + keylen, 3);
614
615 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
616 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
617 CRYPTO_TFM_REQ_MASK);
618 err = crypto_aead_setkey(child, key, keylen);
619 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
620 CRYPTO_TFM_RES_MASK);
621
622 return err;
623}
624
625static int crypto_rfc4309_setauthsize(struct crypto_aead *parent,
626 unsigned int authsize)
627{
628 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
629
630 switch (authsize) {
631 case 8:
632 case 12:
633 case 16:
634 break;
635 default:
636 return -EINVAL;
637 }
638
639 return crypto_aead_setauthsize(ctx->child, authsize);
640}
641
642static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req)
643{
644 struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req);
645 struct aead_request *subreq = &rctx->subreq;
646 struct crypto_aead *aead = crypto_aead_reqtfm(req);
647 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead);
648 struct crypto_aead *child = ctx->child;
649 struct scatterlist *sg;
650 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
651 crypto_aead_alignmask(child) + 1);
652
653 /* L' */
654 iv[0] = 3;
655
656 memcpy(iv + 1, ctx->nonce, 3);
657 memcpy(iv + 4, req->iv, 8);
658
659 scatterwalk_map_and_copy(iv + 16, req->src, 0, req->assoclen - 8, 0);
660
661 sg_init_table(rctx->src, 3);
662 sg_set_buf(rctx->src, iv + 16, req->assoclen - 8);
663 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
664 if (sg != rctx->src + 1)
665 sg_chain(rctx->src, 2, sg);
666
667 if (req->src != req->dst) {
668 sg_init_table(rctx->dst, 3);
669 sg_set_buf(rctx->dst, iv + 16, req->assoclen - 8);
670 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
671 if (sg != rctx->dst + 1)
672 sg_chain(rctx->dst, 2, sg);
673 }
674
675 aead_request_set_tfm(subreq, child);
676 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
677 req->base.data);
678 aead_request_set_crypt(subreq, rctx->src,
679 req->src == req->dst ? rctx->src : rctx->dst,
680 req->cryptlen, iv);
681 aead_request_set_ad(subreq, req->assoclen - 8);
682
683 return subreq;
684}
685
686static int crypto_rfc4309_encrypt(struct aead_request *req)
687{
688 if (req->assoclen != 16 && req->assoclen != 20)
689 return -EINVAL;
690
691 req = crypto_rfc4309_crypt(req);
692
693 return crypto_aead_encrypt(req);
694}
695
696static int crypto_rfc4309_decrypt(struct aead_request *req)
697{
698 if (req->assoclen != 16 && req->assoclen != 20)
699 return -EINVAL;
700
701 req = crypto_rfc4309_crypt(req);
702
703 return crypto_aead_decrypt(req);
704}
705
706static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm)
707{
708 struct aead_instance *inst = aead_alg_instance(tfm);
709 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
710 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
711 struct crypto_aead *aead;
712 unsigned long align;
713
714 aead = crypto_spawn_aead(spawn);
715 if (IS_ERR(aead))
716 return PTR_ERR(aead);
717
718 ctx->child = aead;
719
720 align = crypto_aead_alignmask(aead);
721 align &= ~(crypto_tfm_ctx_alignment() - 1);
722 crypto_aead_set_reqsize(
723 tfm,
724 sizeof(struct crypto_rfc4309_req_ctx) +
725 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
726 align + 32);
727
728 return 0;
729}
730
731static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm)
732{
733 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
734
735 crypto_free_aead(ctx->child);
736}
737
738static void crypto_rfc4309_free(struct aead_instance *inst)
739{
740 crypto_drop_aead(aead_instance_ctx(inst));
741 kfree(inst);
742}
743
744static int crypto_rfc4309_create(struct crypto_template *tmpl,
745 struct rtattr **tb)
746{
747 struct crypto_attr_type *algt;
748 struct aead_instance *inst;
749 struct crypto_aead_spawn *spawn;
750 struct aead_alg *alg;
751 const char *ccm_name;
752 int err;
753
754 algt = crypto_get_attr_type(tb);
755 if (IS_ERR(algt))
756 return PTR_ERR(algt);
757
758 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
759 return -EINVAL;
760
761 ccm_name = crypto_attr_alg_name(tb[1]);
762 if (IS_ERR(ccm_name))
763 return PTR_ERR(ccm_name);
764
765 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
766 if (!inst)
767 return -ENOMEM;
768
769 spawn = aead_instance_ctx(inst);
770 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
771 err = crypto_grab_aead(spawn, ccm_name, 0,
772 crypto_requires_sync(algt->type, algt->mask));
773 if (err)
774 goto out_free_inst;
775
776 alg = crypto_spawn_aead_alg(spawn);
777
778 err = -EINVAL;
779
780 /* We only support 16-byte blocks. */
781 if (crypto_aead_alg_ivsize(alg) != 16)
782 goto out_drop_alg;
783
784 /* Not a stream cipher? */
785 if (alg->base.cra_blocksize != 1)
786 goto out_drop_alg;
787
788 err = -ENAMETOOLONG;
789 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
790 "rfc4309(%s)", alg->base.cra_name) >=
791 CRYPTO_MAX_ALG_NAME ||
792 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
793 "rfc4309(%s)", alg->base.cra_driver_name) >=
794 CRYPTO_MAX_ALG_NAME)
795 goto out_drop_alg;
796
797 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
798 inst->alg.base.cra_priority = alg->base.cra_priority;
799 inst->alg.base.cra_blocksize = 1;
800 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
801
802 inst->alg.ivsize = 8;
803 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
804 inst->alg.maxauthsize = 16;
805
806 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx);
807
808 inst->alg.init = crypto_rfc4309_init_tfm;
809 inst->alg.exit = crypto_rfc4309_exit_tfm;
810
811 inst->alg.setkey = crypto_rfc4309_setkey;
812 inst->alg.setauthsize = crypto_rfc4309_setauthsize;
813 inst->alg.encrypt = crypto_rfc4309_encrypt;
814 inst->alg.decrypt = crypto_rfc4309_decrypt;
815
816 inst->free = crypto_rfc4309_free;
817
818 err = aead_register_instance(tmpl, inst);
819 if (err)
820 goto out_drop_alg;
821
822out:
823 return err;
824
825out_drop_alg:
826 crypto_drop_aead(spawn);
827out_free_inst:
828 kfree(inst);
829 goto out;
830}
831
832static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent,
833 const u8 *inkey, unsigned int keylen)
834{
835 struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(parent);
836
837 return crypto_cipher_setkey(ctx->child, inkey, keylen);
838}
839
840static int crypto_cbcmac_digest_init(struct shash_desc *pdesc)
841{
842 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
843 int bs = crypto_shash_digestsize(pdesc->tfm);
844 u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs;
845
846 ctx->len = 0;
847 memset(dg, 0, bs);
848
849 return 0;
850}
851
852static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p,
853 unsigned int len)
854{
855 struct crypto_shash *parent = pdesc->tfm;
856 struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
857 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
858 struct crypto_cipher *tfm = tctx->child;
859 int bs = crypto_shash_digestsize(parent);
860 u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
861
862 while (len > 0) {
863 unsigned int l = min(len, bs - ctx->len);
864
865 crypto_xor(dg + ctx->len, p, l);
866 ctx->len +=l;
867 len -= l;
868 p += l;
869
870 if (ctx->len == bs) {
871 crypto_cipher_encrypt_one(tfm, dg, dg);
872 ctx->len = 0;
873 }
874 }
875
876 return 0;
877}
878
879static int crypto_cbcmac_digest_final(struct shash_desc *pdesc, u8 *out)
880{
881 struct crypto_shash *parent = pdesc->tfm;
882 struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
883 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
884 struct crypto_cipher *tfm = tctx->child;
885 int bs = crypto_shash_digestsize(parent);
886 u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
887
888 if (ctx->len)
889 crypto_cipher_encrypt_one(tfm, dg, dg);
890
891 memcpy(out, dg, bs);
892 return 0;
893}
894
895static int cbcmac_init_tfm(struct crypto_tfm *tfm)
896{
897 struct crypto_cipher *cipher;
898 struct crypto_instance *inst = (void *)tfm->__crt_alg;
899 struct crypto_spawn *spawn = crypto_instance_ctx(inst);
900 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
901
902 cipher = crypto_spawn_cipher(spawn);
903 if (IS_ERR(cipher))
904 return PTR_ERR(cipher);
905
906 ctx->child = cipher;
907
908 return 0;
909};
910
911static void cbcmac_exit_tfm(struct crypto_tfm *tfm)
912{
913 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
914 crypto_free_cipher(ctx->child);
915}
916
917static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb)
918{
919 struct shash_instance *inst;
920 struct crypto_alg *alg;
921 int err;
922
923 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
924 if (err)
925 return err;
926
927 alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
928 CRYPTO_ALG_TYPE_MASK);
929 if (IS_ERR(alg))
930 return PTR_ERR(alg);
931
932 inst = shash_alloc_instance("cbcmac", alg);
933 err = PTR_ERR(inst);
934 if (IS_ERR(inst))
935 goto out_put_alg;
936
937 err = crypto_init_spawn(shash_instance_ctx(inst), alg,
938 shash_crypto_instance(inst),
939 CRYPTO_ALG_TYPE_MASK);
940 if (err)
941 goto out_free_inst;
942
943 inst->alg.base.cra_priority = alg->cra_priority;
944 inst->alg.base.cra_blocksize = 1;
945
946 inst->alg.digestsize = alg->cra_blocksize;
947 inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx),
948 alg->cra_alignmask + 1) +
949 alg->cra_blocksize;
950
951 inst->alg.base.cra_ctxsize = sizeof(struct cbcmac_tfm_ctx);
952 inst->alg.base.cra_init = cbcmac_init_tfm;
953 inst->alg.base.cra_exit = cbcmac_exit_tfm;
954
955 inst->alg.init = crypto_cbcmac_digest_init;
956 inst->alg.update = crypto_cbcmac_digest_update;
957 inst->alg.final = crypto_cbcmac_digest_final;
958 inst->alg.setkey = crypto_cbcmac_digest_setkey;
959
960 err = shash_register_instance(tmpl, inst);
961
962out_free_inst:
963 if (err)
964 shash_free_instance(shash_crypto_instance(inst));
965
966out_put_alg:
967 crypto_mod_put(alg);
968 return err;
969}
970
971static struct crypto_template crypto_ccm_tmpls[] = {
972 {
973 .name = "cbcmac",
974 .create = cbcmac_create,
975 .free = shash_free_instance,
976 .module = THIS_MODULE,
977 }, {
978 .name = "ccm_base",
979 .create = crypto_ccm_base_create,
980 .module = THIS_MODULE,
981 }, {
982 .name = "ccm",
983 .create = crypto_ccm_create,
984 .module = THIS_MODULE,
985 }, {
986 .name = "rfc4309",
987 .create = crypto_rfc4309_create,
988 .module = THIS_MODULE,
989 },
990};
991
992static int __init crypto_ccm_module_init(void)
993{
994 return crypto_register_templates(crypto_ccm_tmpls,
995 ARRAY_SIZE(crypto_ccm_tmpls));
996}
997
998static void __exit crypto_ccm_module_exit(void)
999{
1000 crypto_unregister_templates(crypto_ccm_tmpls,
1001 ARRAY_SIZE(crypto_ccm_tmpls));
1002}
1003
1004subsys_initcall(crypto_ccm_module_init);
1005module_exit(crypto_ccm_module_exit);
1006
1007MODULE_LICENSE("GPL");
1008MODULE_DESCRIPTION("Counter with CBC MAC");
1009MODULE_ALIAS_CRYPTO("ccm_base");
1010MODULE_ALIAS_CRYPTO("rfc4309");
1011MODULE_ALIAS_CRYPTO("ccm");
1012MODULE_ALIAS_CRYPTO("cbcmac");
1/*
2 * CCM: Counter with CBC-MAC
3 *
4 * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com>
5 *
6 * This program is free software; you can redistribute it and/or modify it
7 * under the terms of the GNU General Public License as published by the Free
8 * Software Foundation; either version 2 of the License, or (at your option)
9 * any later version.
10 *
11 */
12
13#include <crypto/internal/aead.h>
14#include <crypto/internal/hash.h>
15#include <crypto/internal/skcipher.h>
16#include <crypto/scatterwalk.h>
17#include <linux/err.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21#include <linux/slab.h>
22
23#include "internal.h"
24
25struct ccm_instance_ctx {
26 struct crypto_skcipher_spawn ctr;
27 struct crypto_ahash_spawn mac;
28};
29
30struct crypto_ccm_ctx {
31 struct crypto_ahash *mac;
32 struct crypto_skcipher *ctr;
33};
34
35struct crypto_rfc4309_ctx {
36 struct crypto_aead *child;
37 u8 nonce[3];
38};
39
40struct crypto_rfc4309_req_ctx {
41 struct scatterlist src[3];
42 struct scatterlist dst[3];
43 struct aead_request subreq;
44};
45
46struct crypto_ccm_req_priv_ctx {
47 u8 odata[16];
48 u8 idata[16];
49 u8 auth_tag[16];
50 u32 flags;
51 struct scatterlist src[3];
52 struct scatterlist dst[3];
53 struct skcipher_request skreq;
54};
55
56struct cbcmac_tfm_ctx {
57 struct crypto_cipher *child;
58};
59
60struct cbcmac_desc_ctx {
61 unsigned int len;
62};
63
64static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx(
65 struct aead_request *req)
66{
67 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
68
69 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
70}
71
72static int set_msg_len(u8 *block, unsigned int msglen, int csize)
73{
74 __be32 data;
75
76 memset(block, 0, csize);
77 block += csize;
78
79 if (csize >= 4)
80 csize = 4;
81 else if (msglen > (1 << (8 * csize)))
82 return -EOVERFLOW;
83
84 data = cpu_to_be32(msglen);
85 memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
86
87 return 0;
88}
89
90static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key,
91 unsigned int keylen)
92{
93 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
94 struct crypto_skcipher *ctr = ctx->ctr;
95 struct crypto_ahash *mac = ctx->mac;
96 int err = 0;
97
98 crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
99 crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
100 CRYPTO_TFM_REQ_MASK);
101 err = crypto_skcipher_setkey(ctr, key, keylen);
102 crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
103 CRYPTO_TFM_RES_MASK);
104 if (err)
105 goto out;
106
107 crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK);
108 crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) &
109 CRYPTO_TFM_REQ_MASK);
110 err = crypto_ahash_setkey(mac, key, keylen);
111 crypto_aead_set_flags(aead, crypto_ahash_get_flags(mac) &
112 CRYPTO_TFM_RES_MASK);
113
114out:
115 return err;
116}
117
118static int crypto_ccm_setauthsize(struct crypto_aead *tfm,
119 unsigned int authsize)
120{
121 switch (authsize) {
122 case 4:
123 case 6:
124 case 8:
125 case 10:
126 case 12:
127 case 14:
128 case 16:
129 break;
130 default:
131 return -EINVAL;
132 }
133
134 return 0;
135}
136
137static int format_input(u8 *info, struct aead_request *req,
138 unsigned int cryptlen)
139{
140 struct crypto_aead *aead = crypto_aead_reqtfm(req);
141 unsigned int lp = req->iv[0];
142 unsigned int l = lp + 1;
143 unsigned int m;
144
145 m = crypto_aead_authsize(aead);
146
147 memcpy(info, req->iv, 16);
148
149 /* format control info per RFC 3610 and
150 * NIST Special Publication 800-38C
151 */
152 *info |= (8 * ((m - 2) / 2));
153 if (req->assoclen)
154 *info |= 64;
155
156 return set_msg_len(info + 16 - l, cryptlen, l);
157}
158
159static int format_adata(u8 *adata, unsigned int a)
160{
161 int len = 0;
162
163 /* add control info for associated data
164 * RFC 3610 and NIST Special Publication 800-38C
165 */
166 if (a < 65280) {
167 *(__be16 *)adata = cpu_to_be16(a);
168 len = 2;
169 } else {
170 *(__be16 *)adata = cpu_to_be16(0xfffe);
171 *(__be32 *)&adata[2] = cpu_to_be32(a);
172 len = 6;
173 }
174
175 return len;
176}
177
178static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain,
179 unsigned int cryptlen)
180{
181 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
182 struct crypto_aead *aead = crypto_aead_reqtfm(req);
183 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
184 AHASH_REQUEST_ON_STACK(ahreq, ctx->mac);
185 unsigned int assoclen = req->assoclen;
186 struct scatterlist sg[3];
187 u8 *odata = pctx->odata;
188 u8 *idata = pctx->idata;
189 int ilen, err;
190
191 /* format control data for input */
192 err = format_input(odata, req, cryptlen);
193 if (err)
194 goto out;
195
196 sg_init_table(sg, 3);
197 sg_set_buf(&sg[0], odata, 16);
198
199 /* format associated data and compute into mac */
200 if (assoclen) {
201 ilen = format_adata(idata, assoclen);
202 sg_set_buf(&sg[1], idata, ilen);
203 sg_chain(sg, 3, req->src);
204 } else {
205 ilen = 0;
206 sg_chain(sg, 2, req->src);
207 }
208
209 ahash_request_set_tfm(ahreq, ctx->mac);
210 ahash_request_set_callback(ahreq, pctx->flags, NULL, NULL);
211 ahash_request_set_crypt(ahreq, sg, NULL, assoclen + ilen + 16);
212 err = crypto_ahash_init(ahreq);
213 if (err)
214 goto out;
215 err = crypto_ahash_update(ahreq);
216 if (err)
217 goto out;
218
219 /* we need to pad the MAC input to a round multiple of the block size */
220 ilen = 16 - (assoclen + ilen) % 16;
221 if (ilen < 16) {
222 memset(idata, 0, ilen);
223 sg_init_table(sg, 2);
224 sg_set_buf(&sg[0], idata, ilen);
225 if (plain)
226 sg_chain(sg, 2, plain);
227 plain = sg;
228 cryptlen += ilen;
229 }
230
231 ahash_request_set_crypt(ahreq, plain, pctx->odata, cryptlen);
232 err = crypto_ahash_finup(ahreq);
233out:
234 return err;
235}
236
237static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err)
238{
239 struct aead_request *req = areq->data;
240 struct crypto_aead *aead = crypto_aead_reqtfm(req);
241 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
242 u8 *odata = pctx->odata;
243
244 if (!err)
245 scatterwalk_map_and_copy(odata, req->dst,
246 req->assoclen + req->cryptlen,
247 crypto_aead_authsize(aead), 1);
248 aead_request_complete(req, err);
249}
250
251static inline int crypto_ccm_check_iv(const u8 *iv)
252{
253 /* 2 <= L <= 8, so 1 <= L' <= 7. */
254 if (1 > iv[0] || iv[0] > 7)
255 return -EINVAL;
256
257 return 0;
258}
259
260static int crypto_ccm_init_crypt(struct aead_request *req, u8 *tag)
261{
262 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
263 struct scatterlist *sg;
264 u8 *iv = req->iv;
265 int err;
266
267 err = crypto_ccm_check_iv(iv);
268 if (err)
269 return err;
270
271 pctx->flags = aead_request_flags(req);
272
273 /* Note: rfc 3610 and NIST 800-38C require counter of
274 * zero to encrypt auth tag.
275 */
276 memset(iv + 15 - iv[0], 0, iv[0] + 1);
277
278 sg_init_table(pctx->src, 3);
279 sg_set_buf(pctx->src, tag, 16);
280 sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
281 if (sg != pctx->src + 1)
282 sg_chain(pctx->src, 2, sg);
283
284 if (req->src != req->dst) {
285 sg_init_table(pctx->dst, 3);
286 sg_set_buf(pctx->dst, tag, 16);
287 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
288 if (sg != pctx->dst + 1)
289 sg_chain(pctx->dst, 2, sg);
290 }
291
292 return 0;
293}
294
295static int crypto_ccm_encrypt(struct aead_request *req)
296{
297 struct crypto_aead *aead = crypto_aead_reqtfm(req);
298 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
299 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
300 struct skcipher_request *skreq = &pctx->skreq;
301 struct scatterlist *dst;
302 unsigned int cryptlen = req->cryptlen;
303 u8 *odata = pctx->odata;
304 u8 *iv = req->iv;
305 int err;
306
307 err = crypto_ccm_init_crypt(req, odata);
308 if (err)
309 return err;
310
311 err = crypto_ccm_auth(req, sg_next(pctx->src), cryptlen);
312 if (err)
313 return err;
314
315 dst = pctx->src;
316 if (req->src != req->dst)
317 dst = pctx->dst;
318
319 skcipher_request_set_tfm(skreq, ctx->ctr);
320 skcipher_request_set_callback(skreq, pctx->flags,
321 crypto_ccm_encrypt_done, req);
322 skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
323 err = crypto_skcipher_encrypt(skreq);
324 if (err)
325 return err;
326
327 /* copy authtag to end of dst */
328 scatterwalk_map_and_copy(odata, sg_next(dst), cryptlen,
329 crypto_aead_authsize(aead), 1);
330 return err;
331}
332
333static void crypto_ccm_decrypt_done(struct crypto_async_request *areq,
334 int err)
335{
336 struct aead_request *req = areq->data;
337 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
338 struct crypto_aead *aead = crypto_aead_reqtfm(req);
339 unsigned int authsize = crypto_aead_authsize(aead);
340 unsigned int cryptlen = req->cryptlen - authsize;
341 struct scatterlist *dst;
342
343 pctx->flags = 0;
344
345 dst = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
346
347 if (!err) {
348 err = crypto_ccm_auth(req, dst, cryptlen);
349 if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize))
350 err = -EBADMSG;
351 }
352 aead_request_complete(req, err);
353}
354
355static int crypto_ccm_decrypt(struct aead_request *req)
356{
357 struct crypto_aead *aead = crypto_aead_reqtfm(req);
358 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
359 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
360 struct skcipher_request *skreq = &pctx->skreq;
361 struct scatterlist *dst;
362 unsigned int authsize = crypto_aead_authsize(aead);
363 unsigned int cryptlen = req->cryptlen;
364 u8 *authtag = pctx->auth_tag;
365 u8 *odata = pctx->odata;
366 u8 *iv = pctx->idata;
367 int err;
368
369 cryptlen -= authsize;
370
371 err = crypto_ccm_init_crypt(req, authtag);
372 if (err)
373 return err;
374
375 scatterwalk_map_and_copy(authtag, sg_next(pctx->src), cryptlen,
376 authsize, 0);
377
378 dst = pctx->src;
379 if (req->src != req->dst)
380 dst = pctx->dst;
381
382 memcpy(iv, req->iv, 16);
383
384 skcipher_request_set_tfm(skreq, ctx->ctr);
385 skcipher_request_set_callback(skreq, pctx->flags,
386 crypto_ccm_decrypt_done, req);
387 skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv);
388 err = crypto_skcipher_decrypt(skreq);
389 if (err)
390 return err;
391
392 err = crypto_ccm_auth(req, sg_next(dst), cryptlen);
393 if (err)
394 return err;
395
396 /* verify */
397 if (crypto_memneq(authtag, odata, authsize))
398 return -EBADMSG;
399
400 return err;
401}
402
403static int crypto_ccm_init_tfm(struct crypto_aead *tfm)
404{
405 struct aead_instance *inst = aead_alg_instance(tfm);
406 struct ccm_instance_ctx *ictx = aead_instance_ctx(inst);
407 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
408 struct crypto_ahash *mac;
409 struct crypto_skcipher *ctr;
410 unsigned long align;
411 int err;
412
413 mac = crypto_spawn_ahash(&ictx->mac);
414 if (IS_ERR(mac))
415 return PTR_ERR(mac);
416
417 ctr = crypto_spawn_skcipher(&ictx->ctr);
418 err = PTR_ERR(ctr);
419 if (IS_ERR(ctr))
420 goto err_free_mac;
421
422 ctx->mac = mac;
423 ctx->ctr = ctr;
424
425 align = crypto_aead_alignmask(tfm);
426 align &= ~(crypto_tfm_ctx_alignment() - 1);
427 crypto_aead_set_reqsize(
428 tfm,
429 align + sizeof(struct crypto_ccm_req_priv_ctx) +
430 crypto_skcipher_reqsize(ctr));
431
432 return 0;
433
434err_free_mac:
435 crypto_free_ahash(mac);
436 return err;
437}
438
439static void crypto_ccm_exit_tfm(struct crypto_aead *tfm)
440{
441 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
442
443 crypto_free_ahash(ctx->mac);
444 crypto_free_skcipher(ctx->ctr);
445}
446
447static void crypto_ccm_free(struct aead_instance *inst)
448{
449 struct ccm_instance_ctx *ctx = aead_instance_ctx(inst);
450
451 crypto_drop_ahash(&ctx->mac);
452 crypto_drop_skcipher(&ctx->ctr);
453 kfree(inst);
454}
455
456static int crypto_ccm_create_common(struct crypto_template *tmpl,
457 struct rtattr **tb,
458 const char *full_name,
459 const char *ctr_name,
460 const char *mac_name)
461{
462 struct crypto_attr_type *algt;
463 struct aead_instance *inst;
464 struct skcipher_alg *ctr;
465 struct crypto_alg *mac_alg;
466 struct hash_alg_common *mac;
467 struct ccm_instance_ctx *ictx;
468 int err;
469
470 algt = crypto_get_attr_type(tb);
471 if (IS_ERR(algt))
472 return PTR_ERR(algt);
473
474 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
475 return -EINVAL;
476
477 mac_alg = crypto_find_alg(mac_name, &crypto_ahash_type,
478 CRYPTO_ALG_TYPE_HASH,
479 CRYPTO_ALG_TYPE_AHASH_MASK |
480 CRYPTO_ALG_ASYNC);
481 if (IS_ERR(mac_alg))
482 return PTR_ERR(mac_alg);
483
484 mac = __crypto_hash_alg_common(mac_alg);
485 err = -EINVAL;
486 if (mac->digestsize != 16)
487 goto out_put_mac;
488
489 inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
490 err = -ENOMEM;
491 if (!inst)
492 goto out_put_mac;
493
494 ictx = aead_instance_ctx(inst);
495 err = crypto_init_ahash_spawn(&ictx->mac, mac,
496 aead_crypto_instance(inst));
497 if (err)
498 goto err_free_inst;
499
500 crypto_set_skcipher_spawn(&ictx->ctr, aead_crypto_instance(inst));
501 err = crypto_grab_skcipher(&ictx->ctr, ctr_name, 0,
502 crypto_requires_sync(algt->type,
503 algt->mask));
504 if (err)
505 goto err_drop_mac;
506
507 ctr = crypto_spawn_skcipher_alg(&ictx->ctr);
508
509 /* Not a stream cipher? */
510 err = -EINVAL;
511 if (ctr->base.cra_blocksize != 1)
512 goto err_drop_ctr;
513
514 /* We want the real thing! */
515 if (crypto_skcipher_alg_ivsize(ctr) != 16)
516 goto err_drop_ctr;
517
518 err = -ENAMETOOLONG;
519 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
520 "ccm_base(%s,%s)", ctr->base.cra_driver_name,
521 mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
522 goto err_drop_ctr;
523
524 memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
525
526 inst->alg.base.cra_flags = ctr->base.cra_flags & CRYPTO_ALG_ASYNC;
527 inst->alg.base.cra_priority = (mac->base.cra_priority +
528 ctr->base.cra_priority) / 2;
529 inst->alg.base.cra_blocksize = 1;
530 inst->alg.base.cra_alignmask = mac->base.cra_alignmask |
531 ctr->base.cra_alignmask;
532 inst->alg.ivsize = 16;
533 inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
534 inst->alg.maxauthsize = 16;
535 inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx);
536 inst->alg.init = crypto_ccm_init_tfm;
537 inst->alg.exit = crypto_ccm_exit_tfm;
538 inst->alg.setkey = crypto_ccm_setkey;
539 inst->alg.setauthsize = crypto_ccm_setauthsize;
540 inst->alg.encrypt = crypto_ccm_encrypt;
541 inst->alg.decrypt = crypto_ccm_decrypt;
542
543 inst->free = crypto_ccm_free;
544
545 err = aead_register_instance(tmpl, inst);
546 if (err)
547 goto err_drop_ctr;
548
549out_put_mac:
550 crypto_mod_put(mac_alg);
551 return err;
552
553err_drop_ctr:
554 crypto_drop_skcipher(&ictx->ctr);
555err_drop_mac:
556 crypto_drop_ahash(&ictx->mac);
557err_free_inst:
558 kfree(inst);
559 goto out_put_mac;
560}
561
562static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb)
563{
564 const char *cipher_name;
565 char ctr_name[CRYPTO_MAX_ALG_NAME];
566 char mac_name[CRYPTO_MAX_ALG_NAME];
567 char full_name[CRYPTO_MAX_ALG_NAME];
568
569 cipher_name = crypto_attr_alg_name(tb[1]);
570 if (IS_ERR(cipher_name))
571 return PTR_ERR(cipher_name);
572
573 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)",
574 cipher_name) >= CRYPTO_MAX_ALG_NAME)
575 return -ENAMETOOLONG;
576
577 if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)",
578 cipher_name) >= CRYPTO_MAX_ALG_NAME)
579 return -ENAMETOOLONG;
580
581 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm(%s)", cipher_name) >=
582 CRYPTO_MAX_ALG_NAME)
583 return -ENAMETOOLONG;
584
585 return crypto_ccm_create_common(tmpl, tb, full_name, ctr_name,
586 mac_name);
587}
588
589static struct crypto_template crypto_ccm_tmpl = {
590 .name = "ccm",
591 .create = crypto_ccm_create,
592 .module = THIS_MODULE,
593};
594
595static int crypto_ccm_base_create(struct crypto_template *tmpl,
596 struct rtattr **tb)
597{
598 const char *ctr_name;
599 const char *cipher_name;
600 char full_name[CRYPTO_MAX_ALG_NAME];
601
602 ctr_name = crypto_attr_alg_name(tb[1]);
603 if (IS_ERR(ctr_name))
604 return PTR_ERR(ctr_name);
605
606 cipher_name = crypto_attr_alg_name(tb[2]);
607 if (IS_ERR(cipher_name))
608 return PTR_ERR(cipher_name);
609
610 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "ccm_base(%s,%s)",
611 ctr_name, cipher_name) >= CRYPTO_MAX_ALG_NAME)
612 return -ENAMETOOLONG;
613
614 return crypto_ccm_create_common(tmpl, tb, full_name, ctr_name,
615 cipher_name);
616}
617
618static struct crypto_template crypto_ccm_base_tmpl = {
619 .name = "ccm_base",
620 .create = crypto_ccm_base_create,
621 .module = THIS_MODULE,
622};
623
624static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key,
625 unsigned int keylen)
626{
627 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
628 struct crypto_aead *child = ctx->child;
629 int err;
630
631 if (keylen < 3)
632 return -EINVAL;
633
634 keylen -= 3;
635 memcpy(ctx->nonce, key + keylen, 3);
636
637 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
638 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
639 CRYPTO_TFM_REQ_MASK);
640 err = crypto_aead_setkey(child, key, keylen);
641 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
642 CRYPTO_TFM_RES_MASK);
643
644 return err;
645}
646
647static int crypto_rfc4309_setauthsize(struct crypto_aead *parent,
648 unsigned int authsize)
649{
650 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
651
652 switch (authsize) {
653 case 8:
654 case 12:
655 case 16:
656 break;
657 default:
658 return -EINVAL;
659 }
660
661 return crypto_aead_setauthsize(ctx->child, authsize);
662}
663
664static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req)
665{
666 struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req);
667 struct aead_request *subreq = &rctx->subreq;
668 struct crypto_aead *aead = crypto_aead_reqtfm(req);
669 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead);
670 struct crypto_aead *child = ctx->child;
671 struct scatterlist *sg;
672 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
673 crypto_aead_alignmask(child) + 1);
674
675 /* L' */
676 iv[0] = 3;
677
678 memcpy(iv + 1, ctx->nonce, 3);
679 memcpy(iv + 4, req->iv, 8);
680
681 scatterwalk_map_and_copy(iv + 16, req->src, 0, req->assoclen - 8, 0);
682
683 sg_init_table(rctx->src, 3);
684 sg_set_buf(rctx->src, iv + 16, req->assoclen - 8);
685 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
686 if (sg != rctx->src + 1)
687 sg_chain(rctx->src, 2, sg);
688
689 if (req->src != req->dst) {
690 sg_init_table(rctx->dst, 3);
691 sg_set_buf(rctx->dst, iv + 16, req->assoclen - 8);
692 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
693 if (sg != rctx->dst + 1)
694 sg_chain(rctx->dst, 2, sg);
695 }
696
697 aead_request_set_tfm(subreq, child);
698 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
699 req->base.data);
700 aead_request_set_crypt(subreq, rctx->src,
701 req->src == req->dst ? rctx->src : rctx->dst,
702 req->cryptlen, iv);
703 aead_request_set_ad(subreq, req->assoclen - 8);
704
705 return subreq;
706}
707
708static int crypto_rfc4309_encrypt(struct aead_request *req)
709{
710 if (req->assoclen != 16 && req->assoclen != 20)
711 return -EINVAL;
712
713 req = crypto_rfc4309_crypt(req);
714
715 return crypto_aead_encrypt(req);
716}
717
718static int crypto_rfc4309_decrypt(struct aead_request *req)
719{
720 if (req->assoclen != 16 && req->assoclen != 20)
721 return -EINVAL;
722
723 req = crypto_rfc4309_crypt(req);
724
725 return crypto_aead_decrypt(req);
726}
727
728static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm)
729{
730 struct aead_instance *inst = aead_alg_instance(tfm);
731 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
732 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
733 struct crypto_aead *aead;
734 unsigned long align;
735
736 aead = crypto_spawn_aead(spawn);
737 if (IS_ERR(aead))
738 return PTR_ERR(aead);
739
740 ctx->child = aead;
741
742 align = crypto_aead_alignmask(aead);
743 align &= ~(crypto_tfm_ctx_alignment() - 1);
744 crypto_aead_set_reqsize(
745 tfm,
746 sizeof(struct crypto_rfc4309_req_ctx) +
747 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
748 align + 32);
749
750 return 0;
751}
752
753static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm)
754{
755 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
756
757 crypto_free_aead(ctx->child);
758}
759
760static void crypto_rfc4309_free(struct aead_instance *inst)
761{
762 crypto_drop_aead(aead_instance_ctx(inst));
763 kfree(inst);
764}
765
766static int crypto_rfc4309_create(struct crypto_template *tmpl,
767 struct rtattr **tb)
768{
769 struct crypto_attr_type *algt;
770 struct aead_instance *inst;
771 struct crypto_aead_spawn *spawn;
772 struct aead_alg *alg;
773 const char *ccm_name;
774 int err;
775
776 algt = crypto_get_attr_type(tb);
777 if (IS_ERR(algt))
778 return PTR_ERR(algt);
779
780 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
781 return -EINVAL;
782
783 ccm_name = crypto_attr_alg_name(tb[1]);
784 if (IS_ERR(ccm_name))
785 return PTR_ERR(ccm_name);
786
787 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
788 if (!inst)
789 return -ENOMEM;
790
791 spawn = aead_instance_ctx(inst);
792 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
793 err = crypto_grab_aead(spawn, ccm_name, 0,
794 crypto_requires_sync(algt->type, algt->mask));
795 if (err)
796 goto out_free_inst;
797
798 alg = crypto_spawn_aead_alg(spawn);
799
800 err = -EINVAL;
801
802 /* We only support 16-byte blocks. */
803 if (crypto_aead_alg_ivsize(alg) != 16)
804 goto out_drop_alg;
805
806 /* Not a stream cipher? */
807 if (alg->base.cra_blocksize != 1)
808 goto out_drop_alg;
809
810 err = -ENAMETOOLONG;
811 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
812 "rfc4309(%s)", alg->base.cra_name) >=
813 CRYPTO_MAX_ALG_NAME ||
814 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
815 "rfc4309(%s)", alg->base.cra_driver_name) >=
816 CRYPTO_MAX_ALG_NAME)
817 goto out_drop_alg;
818
819 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
820 inst->alg.base.cra_priority = alg->base.cra_priority;
821 inst->alg.base.cra_blocksize = 1;
822 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
823
824 inst->alg.ivsize = 8;
825 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
826 inst->alg.maxauthsize = 16;
827
828 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx);
829
830 inst->alg.init = crypto_rfc4309_init_tfm;
831 inst->alg.exit = crypto_rfc4309_exit_tfm;
832
833 inst->alg.setkey = crypto_rfc4309_setkey;
834 inst->alg.setauthsize = crypto_rfc4309_setauthsize;
835 inst->alg.encrypt = crypto_rfc4309_encrypt;
836 inst->alg.decrypt = crypto_rfc4309_decrypt;
837
838 inst->free = crypto_rfc4309_free;
839
840 err = aead_register_instance(tmpl, inst);
841 if (err)
842 goto out_drop_alg;
843
844out:
845 return err;
846
847out_drop_alg:
848 crypto_drop_aead(spawn);
849out_free_inst:
850 kfree(inst);
851 goto out;
852}
853
854static struct crypto_template crypto_rfc4309_tmpl = {
855 .name = "rfc4309",
856 .create = crypto_rfc4309_create,
857 .module = THIS_MODULE,
858};
859
860static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent,
861 const u8 *inkey, unsigned int keylen)
862{
863 struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(parent);
864
865 return crypto_cipher_setkey(ctx->child, inkey, keylen);
866}
867
868static int crypto_cbcmac_digest_init(struct shash_desc *pdesc)
869{
870 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
871 int bs = crypto_shash_digestsize(pdesc->tfm);
872 u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs;
873
874 ctx->len = 0;
875 memset(dg, 0, bs);
876
877 return 0;
878}
879
880static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p,
881 unsigned int len)
882{
883 struct crypto_shash *parent = pdesc->tfm;
884 struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
885 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
886 struct crypto_cipher *tfm = tctx->child;
887 int bs = crypto_shash_digestsize(parent);
888 u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
889
890 while (len > 0) {
891 unsigned int l = min(len, bs - ctx->len);
892
893 crypto_xor(dg + ctx->len, p, l);
894 ctx->len +=l;
895 len -= l;
896 p += l;
897
898 if (ctx->len == bs) {
899 crypto_cipher_encrypt_one(tfm, dg, dg);
900 ctx->len = 0;
901 }
902 }
903
904 return 0;
905}
906
907static int crypto_cbcmac_digest_final(struct shash_desc *pdesc, u8 *out)
908{
909 struct crypto_shash *parent = pdesc->tfm;
910 struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent);
911 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc);
912 struct crypto_cipher *tfm = tctx->child;
913 int bs = crypto_shash_digestsize(parent);
914 u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs;
915
916 if (ctx->len)
917 crypto_cipher_encrypt_one(tfm, dg, dg);
918
919 memcpy(out, dg, bs);
920 return 0;
921}
922
923static int cbcmac_init_tfm(struct crypto_tfm *tfm)
924{
925 struct crypto_cipher *cipher;
926 struct crypto_instance *inst = (void *)tfm->__crt_alg;
927 struct crypto_spawn *spawn = crypto_instance_ctx(inst);
928 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
929
930 cipher = crypto_spawn_cipher(spawn);
931 if (IS_ERR(cipher))
932 return PTR_ERR(cipher);
933
934 ctx->child = cipher;
935
936 return 0;
937};
938
939static void cbcmac_exit_tfm(struct crypto_tfm *tfm)
940{
941 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
942 crypto_free_cipher(ctx->child);
943}
944
945static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb)
946{
947 struct shash_instance *inst;
948 struct crypto_alg *alg;
949 int err;
950
951 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
952 if (err)
953 return err;
954
955 alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
956 CRYPTO_ALG_TYPE_MASK);
957 if (IS_ERR(alg))
958 return PTR_ERR(alg);
959
960 inst = shash_alloc_instance("cbcmac", alg);
961 err = PTR_ERR(inst);
962 if (IS_ERR(inst))
963 goto out_put_alg;
964
965 err = crypto_init_spawn(shash_instance_ctx(inst), alg,
966 shash_crypto_instance(inst),
967 CRYPTO_ALG_TYPE_MASK);
968 if (err)
969 goto out_free_inst;
970
971 inst->alg.base.cra_priority = alg->cra_priority;
972 inst->alg.base.cra_blocksize = 1;
973
974 inst->alg.digestsize = alg->cra_blocksize;
975 inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx),
976 alg->cra_alignmask + 1) +
977 alg->cra_blocksize;
978
979 inst->alg.base.cra_ctxsize = sizeof(struct cbcmac_tfm_ctx);
980 inst->alg.base.cra_init = cbcmac_init_tfm;
981 inst->alg.base.cra_exit = cbcmac_exit_tfm;
982
983 inst->alg.init = crypto_cbcmac_digest_init;
984 inst->alg.update = crypto_cbcmac_digest_update;
985 inst->alg.final = crypto_cbcmac_digest_final;
986 inst->alg.setkey = crypto_cbcmac_digest_setkey;
987
988 err = shash_register_instance(tmpl, inst);
989
990out_free_inst:
991 if (err)
992 shash_free_instance(shash_crypto_instance(inst));
993
994out_put_alg:
995 crypto_mod_put(alg);
996 return err;
997}
998
999static struct crypto_template crypto_cbcmac_tmpl = {
1000 .name = "cbcmac",
1001 .create = cbcmac_create,
1002 .free = shash_free_instance,
1003 .module = THIS_MODULE,
1004};
1005
1006static int __init crypto_ccm_module_init(void)
1007{
1008 int err;
1009
1010 err = crypto_register_template(&crypto_cbcmac_tmpl);
1011 if (err)
1012 goto out;
1013
1014 err = crypto_register_template(&crypto_ccm_base_tmpl);
1015 if (err)
1016 goto out_undo_cbcmac;
1017
1018 err = crypto_register_template(&crypto_ccm_tmpl);
1019 if (err)
1020 goto out_undo_base;
1021
1022 err = crypto_register_template(&crypto_rfc4309_tmpl);
1023 if (err)
1024 goto out_undo_ccm;
1025
1026out:
1027 return err;
1028
1029out_undo_ccm:
1030 crypto_unregister_template(&crypto_ccm_tmpl);
1031out_undo_base:
1032 crypto_unregister_template(&crypto_ccm_base_tmpl);
1033out_undo_cbcmac:
1034 crypto_register_template(&crypto_cbcmac_tmpl);
1035 goto out;
1036}
1037
1038static void __exit crypto_ccm_module_exit(void)
1039{
1040 crypto_unregister_template(&crypto_rfc4309_tmpl);
1041 crypto_unregister_template(&crypto_ccm_tmpl);
1042 crypto_unregister_template(&crypto_ccm_base_tmpl);
1043 crypto_unregister_template(&crypto_cbcmac_tmpl);
1044}
1045
1046module_init(crypto_ccm_module_init);
1047module_exit(crypto_ccm_module_exit);
1048
1049MODULE_LICENSE("GPL");
1050MODULE_DESCRIPTION("Counter with CBC MAC");
1051MODULE_ALIAS_CRYPTO("ccm_base");
1052MODULE_ALIAS_CRYPTO("rfc4309");
1053MODULE_ALIAS_CRYPTO("ccm");