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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
18struct ccm_instance_ctx {
19 struct crypto_skcipher_spawn ctr;
20 struct crypto_ahash_spawn mac;
21};
22
23struct crypto_ccm_ctx {
24 struct crypto_ahash *mac;
25 struct crypto_skcipher *ctr;
26};
27
28struct crypto_rfc4309_ctx {
29 struct crypto_aead *child;
30 u8 nonce[3];
31};
32
33struct crypto_rfc4309_req_ctx {
34 struct scatterlist src[3];
35 struct scatterlist dst[3];
36 struct aead_request subreq;
37};
38
39struct crypto_ccm_req_priv_ctx {
40 u8 odata[16];
41 u8 idata[16];
42 u8 auth_tag[16];
43 u32 flags;
44 struct scatterlist src[3];
45 struct scatterlist dst[3];
46 union {
47 struct ahash_request ahreq;
48 struct skcipher_request skreq;
49 };
50};
51
52struct cbcmac_tfm_ctx {
53 struct crypto_cipher *child;
54};
55
56struct cbcmac_desc_ctx {
57 unsigned int len;
58};
59
60static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx(
61 struct aead_request *req)
62{
63 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
64
65 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
66}
67
68static int set_msg_len(u8 *block, unsigned int msglen, int csize)
69{
70 __be32 data;
71
72 memset(block, 0, csize);
73 block += csize;
74
75 if (csize >= 4)
76 csize = 4;
77 else if (msglen > (1 << (8 * csize)))
78 return -EOVERFLOW;
79
80 data = cpu_to_be32(msglen);
81 memcpy(block - csize, (u8 *)&data + 4 - csize, csize);
82
83 return 0;
84}
85
86static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key,
87 unsigned int keylen)
88{
89 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead);
90 struct crypto_skcipher *ctr = ctx->ctr;
91 struct crypto_ahash *mac = ctx->mac;
92 int err;
93
94 crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
95 crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
96 CRYPTO_TFM_REQ_MASK);
97 err = crypto_skcipher_setkey(ctr, key, keylen);
98 if (err)
99 return err;
100
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);
105}
106
107static int crypto_ccm_setauthsize(struct crypto_aead *tfm,
108 unsigned int authsize)
109{
110 switch (authsize) {
111 case 4:
112 case 6:
113 case 8:
114 case 10:
115 case 12:
116 case 14:
117 case 16:
118 break;
119 default:
120 return -EINVAL;
121 }
122
123 return 0;
124}
125
126static int format_input(u8 *info, struct aead_request *req,
127 unsigned int cryptlen)
128{
129 struct crypto_aead *aead = crypto_aead_reqtfm(req);
130 unsigned int lp = req->iv[0];
131 unsigned int l = lp + 1;
132 unsigned int m;
133
134 m = crypto_aead_authsize(aead);
135
136 memcpy(info, req->iv, 16);
137
138
139
140
141 *info |= (8 * ((m - 2) / 2));
142 if (req->assoclen)
143 *info |= 64;
144
145 return set_msg_len(info + 16 - l, cryptlen, l);
146}
147
148static int format_adata(u8 *adata, unsigned int a)
149{
150 int len = 0;
151
152
153
154
155 if (a < 65280) {
156 *(__be16 *)adata = cpu_to_be16(a);
157 len = 2;
158 } else {
159 *(__be16 *)adata = cpu_to_be16(0xfffe);
160 *(__be32 *)&adata[2] = cpu_to_be32(a);
161 len = 6;
162 }
163
164 return len;
165}
166
167static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain,
168 unsigned int cryptlen)
169{
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;
178 int ilen, err;
179
180
181 err = format_input(odata, req, cryptlen);
182 if (err)
183 goto out;
184
185 sg_init_table(sg, 3);
186 sg_set_buf(&sg[0], odata, 16);
187
188
189 if (assoclen) {
190 ilen = format_adata(idata, assoclen);
191 sg_set_buf(&sg[1], idata, ilen);
192 sg_chain(sg, 3, req->src);
193 } else {
194 ilen = 0;
195 sg_chain(sg, 2, req->src);
196 }
197
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);
202 if (err)
203 goto out;
204 err = crypto_ahash_update(ahreq);
205 if (err)
206 goto out;
207
208
209 ilen = 16 - (assoclen + ilen) % 16;
210 if (ilen < 16) {
211 memset(idata, 0, ilen);
212 sg_init_table(sg, 2);
213 sg_set_buf(&sg[0], idata, ilen);
214 if (plain)
215 sg_chain(sg, 2, plain);
216 plain = sg;
217 cryptlen += ilen;
218 }
219
220 ahash_request_set_crypt(ahreq, plain, pctx->odata, cryptlen);
221 err = crypto_ahash_finup(ahreq);
222out:
223 return err;
224}
225
226static void crypto_ccm_encrypt_done(struct crypto_async_request *areq, int err)
227{
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;
232
233 if (!err)
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);
238}
239
240static inline int crypto_ccm_check_iv(const u8 *iv)
241{
242
243 if (1 > iv[0] || iv[0] > 7)
244 return -EINVAL;
245
246 return 0;
247}
248
249static int crypto_ccm_init_crypt(struct aead_request *req, u8 *tag)
250{
251 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req);
252 struct scatterlist *sg;
253 u8 *iv = req->iv;
254 int err;
255
256 err = crypto_ccm_check_iv(iv);
257 if (err)
258 return err;
259
260 pctx->flags = aead_request_flags(req);
261
262
263
264
265 memset(iv + 15 - iv[0], 0, iv[0] + 1);
266
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);
272
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);
279 }
280
281 return 0;
282}
283
284static int crypto_ccm_encrypt(struct aead_request *req)
285{
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;
293 u8 *iv = req->iv;
294 int err;
295
296 err = crypto_ccm_init_crypt(req, odata);
297 if (err)
298 return err;
299
300 err = crypto_ccm_auth(req, sg_next(pctx->src), cryptlen);
301 if (err)
302 return err;
303
304 dst = pctx->src;
305 if (req->src != req->dst)
306 dst = pctx->dst;
307
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);
313 if (err)
314 return err;
315
316
317 scatterwalk_map_and_copy(odata, sg_next(dst), cryptlen,
318 crypto_aead_authsize(aead), 1);
319 return err;
320}
321
322static void crypto_ccm_decrypt_done(struct crypto_async_request *areq,
323 int err)
324{
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;
331
332 pctx->flags = 0;
333
334 dst = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
335
336 if (!err) {
337 err = crypto_ccm_auth(req, dst, cryptlen);
338 if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize))
339 err = -EBADMSG;
340 }
341 aead_request_complete(req, err);
342}
343
344static int crypto_ccm_decrypt(struct aead_request *req)
345{
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;
356 int err;
357
358 cryptlen -= authsize;
359
360 err = crypto_ccm_init_crypt(req, authtag);
361 if (err)
362 return err;
363
364 scatterwalk_map_and_copy(authtag, sg_next(pctx->src), cryptlen,
365 authsize, 0);
366
367 dst = pctx->src;
368 if (req->src != req->dst)
369 dst = pctx->dst;
370
371 memcpy(iv, req->iv, 16);
372
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);
378 if (err)
379 return err;
380
381 err = crypto_ccm_auth(req, sg_next(dst), cryptlen);
382 if (err)
383 return err;
384
385
386 if (crypto_memneq(authtag, odata, authsize))
387 return -EBADMSG;
388
389 return err;
390}
391
392static int crypto_ccm_init_tfm(struct crypto_aead *tfm)
393{
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;
399 unsigned long align;
400 int err;
401
402 mac = crypto_spawn_ahash(&ictx->mac);
403 if (IS_ERR(mac))
404 return PTR_ERR(mac);
405
406 ctr = crypto_spawn_skcipher(&ictx->ctr);
407 err = PTR_ERR(ctr);
408 if (IS_ERR(ctr))
409 goto err_free_mac;
410
411 ctx->mac = mac;
412 ctx->ctr = ctr;
413
414 align = crypto_aead_alignmask(tfm);
415 align &= ~(crypto_tfm_ctx_alignment() - 1);
416 crypto_aead_set_reqsize(
417 tfm,
418 align + sizeof(struct crypto_ccm_req_priv_ctx) +
419 max(crypto_ahash_reqsize(mac), crypto_skcipher_reqsize(ctr)));
420
421 return 0;
422
423err_free_mac:
424 crypto_free_ahash(mac);
425 return err;
426}
427
428static void crypto_ccm_exit_tfm(struct crypto_aead *tfm)
429{
430 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm);
431
432 crypto_free_ahash(ctx->mac);
433 crypto_free_skcipher(ctx->ctr);
434}
435
436static void crypto_ccm_free(struct aead_instance *inst)
437{
438 struct ccm_instance_ctx *ctx = aead_instance_ctx(inst);
439
440 crypto_drop_ahash(&ctx->mac);
441 crypto_drop_skcipher(&ctx->ctr);
442 kfree(inst);
443}
444
445static int crypto_ccm_create_common(struct crypto_template *tmpl,
446 struct rtattr **tb,
447 const char *ctr_name,
448 const char *mac_name)
449{
450 struct crypto_attr_type *algt;
451 u32 mask;
452 struct aead_instance *inst;
453 struct ccm_instance_ctx *ictx;
454 struct skcipher_alg *ctr;
455 struct hash_alg_common *mac;
456 int err;
457
458 algt = crypto_get_attr_type(tb);
459 if (IS_ERR(algt))
460 return PTR_ERR(algt);
461
462 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
463 return -EINVAL;
464
465 mask = crypto_requires_sync(algt->type, algt->mask);
466
467 inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL);
468 if (!inst)
469 return -ENOMEM;
470 ictx = aead_instance_ctx(inst);
471
472 err = crypto_grab_ahash(&ictx->mac, aead_crypto_instance(inst),
473 mac_name, 0, CRYPTO_ALG_ASYNC);
474 if (err)
475 goto err_free_inst;
476 mac = crypto_spawn_ahash_alg(&ictx->mac);
477
478 err = -EINVAL;
479 if (strncmp(mac->base.cra_name, "cbcmac(", 7) != 0 ||
480 mac->digestsize != 16)
481 goto err_free_inst;
482
483 err = crypto_grab_skcipher(&ictx->ctr, aead_crypto_instance(inst),
484 ctr_name, 0, mask);
485 if (err)
486 goto err_free_inst;
487 ctr = crypto_spawn_skcipher_alg(&ictx->ctr);
488
489
490 err = -EINVAL;
491 if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
492 crypto_skcipher_alg_ivsize(ctr) != 16 ||
493 ctr->base.cra_blocksize != 1)
494 goto err_free_inst;
495
496
497 if (strcmp(ctr->base.cra_name + 4, mac->base.cra_name + 7) != 0)
498 goto err_free_inst;
499
500 err = -ENAMETOOLONG;
501 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
502 "ccm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
503 goto err_free_inst;
504
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)
508 goto err_free_inst;
509
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;
526
527 inst->free = crypto_ccm_free;
528
529 err = aead_register_instance(tmpl, inst);
530 if (err) {
531err_free_inst:
532 crypto_ccm_free(inst);
533 }
534 return err;
535}
536
537static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb)
538{
539 const char *cipher_name;
540 char ctr_name[CRYPTO_MAX_ALG_NAME];
541 char mac_name[CRYPTO_MAX_ALG_NAME];
542
543 cipher_name = crypto_attr_alg_name(tb[1]);
544 if (IS_ERR(cipher_name))
545 return PTR_ERR(cipher_name);
546
547 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)",
548 cipher_name) >= CRYPTO_MAX_ALG_NAME)
549 return -ENAMETOOLONG;
550
551 if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)",
552 cipher_name) >= CRYPTO_MAX_ALG_NAME)
553 return -ENAMETOOLONG;
554
555 return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name);
556}
557
558static int crypto_ccm_base_create(struct crypto_template *tmpl,
559 struct rtattr **tb)
560{
561 const char *ctr_name;
562 const char *mac_name;
563
564 ctr_name = crypto_attr_alg_name(tb[1]);
565 if (IS_ERR(ctr_name))
566 return PTR_ERR(ctr_name);
567
568 mac_name = crypto_attr_alg_name(tb[2]);
569 if (IS_ERR(mac_name))
570 return PTR_ERR(mac_name);
571
572 return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name);
573}
574
575static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key,
576 unsigned int keylen)
577{
578 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
579 struct crypto_aead *child = ctx->child;
580
581 if (keylen < 3)
582 return -EINVAL;
583
584 keylen -= 3;
585 memcpy(ctx->nonce, key + keylen, 3);
586
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);
591}
592
593static int crypto_rfc4309_setauthsize(struct crypto_aead *parent,
594 unsigned int authsize)
595{
596 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent);
597
598 switch (authsize) {
599 case 8:
600 case 12:
601 case 16:
602 break;
603 default:
604 return -EINVAL;
605 }
606
607 return crypto_aead_setauthsize(ctx->child, authsize);
608}
609
610static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req)
611{
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);
620
621
622 iv[0] = 3;
623
624 memcpy(iv + 1, ctx->nonce, 3);
625 memcpy(iv + 4, req->iv, 8);
626
627 scatterwalk_map_and_copy(iv + 16, req->src, 0, req->assoclen - 8, 0);
628
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);
634
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);
641 }
642
643 aead_request_set_tfm(subreq, child);
644 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
645 req->base.data);
646 aead_request_set_crypt(subreq, rctx->src,
647 req->src == req->dst ? rctx->src : rctx->dst,
648 req->cryptlen, iv);
649 aead_request_set_ad(subreq, req->assoclen - 8);
650
651 return subreq;
652}
653
654static int crypto_rfc4309_encrypt(struct aead_request *req)
655{
656 if (req->assoclen != 16 && req->assoclen != 20)
657 return -EINVAL;
658
659 req = crypto_rfc4309_crypt(req);
660
661 return crypto_aead_encrypt(req);
662}
663
664static int crypto_rfc4309_decrypt(struct aead_request *req)
665{
666 if (req->assoclen != 16 && req->assoclen != 20)
667 return -EINVAL;
668
669 req = crypto_rfc4309_crypt(req);
670
671 return crypto_aead_decrypt(req);
672}
673
674static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm)
675{
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;
680 unsigned long align;
681
682 aead = crypto_spawn_aead(spawn);
683 if (IS_ERR(aead))
684 return PTR_ERR(aead);
685
686 ctx->child = aead;
687
688 align = crypto_aead_alignmask(aead);
689 align &= ~(crypto_tfm_ctx_alignment() - 1);
690 crypto_aead_set_reqsize(
691 tfm,
692 sizeof(struct crypto_rfc4309_req_ctx) +
693 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
694 align + 32);
695
696 return 0;
697}
698
699static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm)
700{
701 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm);
702
703 crypto_free_aead(ctx->child);
704}
705
706static void crypto_rfc4309_free(struct aead_instance *inst)
707{
708 crypto_drop_aead(aead_instance_ctx(inst));
709 kfree(inst);
710}
711
712static int crypto_rfc4309_create(struct crypto_template *tmpl,
713 struct rtattr **tb)
714{
715 struct crypto_attr_type *algt;
716 u32 mask;
717 struct aead_instance *inst;
718 struct crypto_aead_spawn *spawn;
719 struct aead_alg *alg;
720 int err;
721
722 algt = crypto_get_attr_type(tb);
723 if (IS_ERR(algt))
724 return PTR_ERR(algt);
725
726 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
727 return -EINVAL;
728
729 mask = crypto_requires_sync(algt->type, algt->mask);
730
731 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
732 if (!inst)
733 return -ENOMEM;
734
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);
738 if (err)
739 goto err_free_inst;
740
741 alg = crypto_spawn_aead_alg(spawn);
742
743 err = -EINVAL;
744
745
746 if (crypto_aead_alg_ivsize(alg) != 16)
747 goto err_free_inst;
748
749
750 if (alg->base.cra_blocksize != 1)
751 goto err_free_inst;
752
753 err = -ENAMETOOLONG;
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) >=
759 CRYPTO_MAX_ALG_NAME)
760 goto err_free_inst;
761
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;
766
767 inst->alg.ivsize = 8;
768 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
769 inst->alg.maxauthsize = 16;
770
771 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx);
772
773 inst->alg.init = crypto_rfc4309_init_tfm;
774 inst->alg.exit = crypto_rfc4309_exit_tfm;
775
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;
780
781 inst->free = crypto_rfc4309_free;
782
783 err = aead_register_instance(tmpl, inst);
784 if (err) {
785err_free_inst:
786 crypto_rfc4309_free(inst);
787 }
788 return err;
789}
790
791static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent,
792 const u8 *inkey, unsigned int keylen)
793{
794 struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(parent);
795
796 return crypto_cipher_setkey(ctx->child, inkey, keylen);
797}
798
799static int crypto_cbcmac_digest_init(struct shash_desc *pdesc)
800{
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;
804
805 ctx->len = 0;
806 memset(dg, 0, bs);
807
808 return 0;
809}
810
811static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p,
812 unsigned int len)
813{
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;
820
821 while (len > 0) {
822 unsigned int l = min(len, bs - ctx->len);
823
824 crypto_xor(dg + ctx->len, p, l);
825 ctx->len +=l;
826 len -= l;
827 p += l;
828
829 if (ctx->len == bs) {
830 crypto_cipher_encrypt_one(tfm, dg, dg);
831 ctx->len = 0;
832 }
833 }
834
835 return 0;
836}
837
838static int crypto_cbcmac_digest_final(struct shash_desc *pdesc, u8 *out)
839{
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;
846
847 if (ctx->len)
848 crypto_cipher_encrypt_one(tfm, dg, dg);
849
850 memcpy(out, dg, bs);
851 return 0;
852}
853
854static int cbcmac_init_tfm(struct crypto_tfm *tfm)
855{
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);
860
861 cipher = crypto_spawn_cipher(spawn);
862 if (IS_ERR(cipher))
863 return PTR_ERR(cipher);
864
865 ctx->child = cipher;
866
867 return 0;
868};
869
870static void cbcmac_exit_tfm(struct crypto_tfm *tfm)
871{
872 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm);
873 crypto_free_cipher(ctx->child);
874}
875
876static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb)
877{
878 struct shash_instance *inst;
879 struct crypto_cipher_spawn *spawn;
880 struct crypto_alg *alg;
881 int err;
882
883 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH);
884 if (err)
885 return err;
886
887 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
888 if (!inst)
889 return -ENOMEM;
890 spawn = shash_instance_ctx(inst);
891
892 err = crypto_grab_cipher(spawn, shash_crypto_instance(inst),
893 crypto_attr_alg_name(tb[1]), 0, 0);
894 if (err)
895 goto err_free_inst;
896 alg = crypto_spawn_cipher_alg(spawn);
897
898 err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg);
899 if (err)
900 goto err_free_inst;
901
902 inst->alg.base.cra_priority = alg->cra_priority;
903 inst->alg.base.cra_blocksize = 1;
904
905 inst->alg.digestsize = alg->cra_blocksize;
906 inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx),
907 alg->cra_alignmask + 1) +
908 alg->cra_blocksize;
909
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;
913
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;
918
919 inst->free = shash_free_singlespawn_instance;
920
921 err = shash_register_instance(tmpl, inst);
922 if (err) {
923err_free_inst:
924 shash_free_singlespawn_instance(inst);
925 }
926 return err;
927}
928
929static struct crypto_template crypto_ccm_tmpls[] = {
930 {
931 .name = "cbcmac",
932 .create = cbcmac_create,
933 .module = THIS_MODULE,
934 }, {
935 .name = "ccm_base",
936 .create = crypto_ccm_base_create,
937 .module = THIS_MODULE,
938 }, {
939 .name = "ccm",
940 .create = crypto_ccm_create,
941 .module = THIS_MODULE,
942 }, {
943 .name = "rfc4309",
944 .create = crypto_rfc4309_create,
945 .module = THIS_MODULE,
946 },
947};
948
949static int __init crypto_ccm_module_init(void)
950{
951 return crypto_register_templates(crypto_ccm_tmpls,
952 ARRAY_SIZE(crypto_ccm_tmpls));
953}
954
955static void __exit crypto_ccm_module_exit(void)
956{
957 crypto_unregister_templates(crypto_ccm_tmpls,
958 ARRAY_SIZE(crypto_ccm_tmpls));
959}
960
961subsys_initcall(crypto_ccm_module_init);
962module_exit(crypto_ccm_module_exit);
963
964MODULE_LICENSE("GPL");
965MODULE_DESCRIPTION("Counter with CBC MAC");
966MODULE_ALIAS_CRYPTO("ccm_base");
967MODULE_ALIAS_CRYPTO("rfc4309");
968MODULE_ALIAS_CRYPTO("ccm");
969MODULE_ALIAS_CRYPTO("cbcmac");
970
