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1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * GCM: Galois/Counter Mode.
4 *
5 * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
6 */
7
8#include <crypto/gf128mul.h>
9#include <crypto/internal/aead.h>
10#include <crypto/internal/skcipher.h>
11#include <crypto/internal/hash.h>
12#include <crypto/null.h>
13#include <crypto/scatterwalk.h>
14#include <crypto/gcm.h>
15#include <crypto/hash.h>
16#include "internal.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
23struct gcm_instance_ctx {
24 struct crypto_skcipher_spawn ctr;
25 struct crypto_ahash_spawn ghash;
26};
27
28struct crypto_gcm_ctx {
29 struct crypto_skcipher *ctr;
30 struct crypto_ahash *ghash;
31};
32
33struct crypto_rfc4106_ctx {
34 struct crypto_aead *child;
35 u8 nonce[4];
36};
37
38struct crypto_rfc4106_req_ctx {
39 struct scatterlist src[3];
40 struct scatterlist dst[3];
41 struct aead_request subreq;
42};
43
44struct crypto_rfc4543_instance_ctx {
45 struct crypto_aead_spawn aead;
46};
47
48struct crypto_rfc4543_ctx {
49 struct crypto_aead *child;
50 struct crypto_sync_skcipher *null;
51 u8 nonce[4];
52};
53
54struct crypto_rfc4543_req_ctx {
55 struct aead_request subreq;
56};
57
58struct crypto_gcm_ghash_ctx {
59 unsigned int cryptlen;
60 struct scatterlist *src;
61 int (*complete)(struct aead_request *req, u32 flags);
62};
63
64struct crypto_gcm_req_priv_ctx {
65 u8 iv[16];
66 u8 auth_tag[16];
67 u8 iauth_tag[16];
68 struct scatterlist src[3];
69 struct scatterlist dst[3];
70 struct scatterlist sg;
71 struct crypto_gcm_ghash_ctx ghash_ctx;
72 union {
73 struct ahash_request ahreq;
74 struct skcipher_request skreq;
75 } u;
76};
77
78static struct {
79 u8 buf[16];
80 struct scatterlist sg;
81} *gcm_zeroes;
82
83static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
84
85static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
86 struct aead_request *req)
87{
88 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
89
90 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
91}
92
93static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
94 unsigned int keylen)
95{
96 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
97 struct crypto_ahash *ghash = ctx->ghash;
98 struct crypto_skcipher *ctr = ctx->ctr;
99 struct {
100 be128 hash;
101 u8 iv[16];
102
103 struct crypto_wait wait;
104
105 struct scatterlist sg[1];
106 struct skcipher_request req;
107 } *data;
108 int err;
109
110 crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
111 crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
112 CRYPTO_TFM_REQ_MASK);
113 err = crypto_skcipher_setkey(ctr, key, keylen);
114 crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
115 CRYPTO_TFM_RES_MASK);
116 if (err)
117 return err;
118
119 data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
120 GFP_KERNEL);
121 if (!data)
122 return -ENOMEM;
123
124 crypto_init_wait(&data->wait);
125 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
126 skcipher_request_set_tfm(&data->req, ctr);
127 skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
128 CRYPTO_TFM_REQ_MAY_BACKLOG,
129 crypto_req_done,
130 &data->wait);
131 skcipher_request_set_crypt(&data->req, data->sg, data->sg,
132 sizeof(data->hash), data->iv);
133
134 err = crypto_wait_req(crypto_skcipher_encrypt(&data->req),
135 &data->wait);
136
137 if (err)
138 goto out;
139
140 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
141 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
142 CRYPTO_TFM_REQ_MASK);
143 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
144 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
145 CRYPTO_TFM_RES_MASK);
146
147out:
148 kzfree(data);
149 return err;
150}
151
152static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
153 unsigned int authsize)
154{
155 return crypto_gcm_check_authsize(authsize);
156}
157
158static void crypto_gcm_init_common(struct aead_request *req)
159{
160 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
161 __be32 counter = cpu_to_be32(1);
162 struct scatterlist *sg;
163
164 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
165 memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE);
166 memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4);
167
168 sg_init_table(pctx->src, 3);
169 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
170 sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
171 if (sg != pctx->src + 1)
172 sg_chain(pctx->src, 2, sg);
173
174 if (req->src != req->dst) {
175 sg_init_table(pctx->dst, 3);
176 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
177 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
178 if (sg != pctx->dst + 1)
179 sg_chain(pctx->dst, 2, sg);
180 }
181}
182
183static void crypto_gcm_init_crypt(struct aead_request *req,
184 unsigned int cryptlen)
185{
186 struct crypto_aead *aead = crypto_aead_reqtfm(req);
187 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
188 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
189 struct skcipher_request *skreq = &pctx->u.skreq;
190 struct scatterlist *dst;
191
192 dst = req->src == req->dst ? pctx->src : pctx->dst;
193
194 skcipher_request_set_tfm(skreq, ctx->ctr);
195 skcipher_request_set_crypt(skreq, pctx->src, dst,
196 cryptlen + sizeof(pctx->auth_tag),
197 pctx->iv);
198}
199
200static inline unsigned int gcm_remain(unsigned int len)
201{
202 len &= 0xfU;
203 return len ? 16 - len : 0;
204}
205
206static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
207
208static int gcm_hash_update(struct aead_request *req,
209 crypto_completion_t compl,
210 struct scatterlist *src,
211 unsigned int len, u32 flags)
212{
213 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
214 struct ahash_request *ahreq = &pctx->u.ahreq;
215
216 ahash_request_set_callback(ahreq, flags, compl, req);
217 ahash_request_set_crypt(ahreq, src, NULL, len);
218
219 return crypto_ahash_update(ahreq);
220}
221
222static int gcm_hash_remain(struct aead_request *req,
223 unsigned int remain,
224 crypto_completion_t compl, u32 flags)
225{
226 return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
227}
228
229static int gcm_hash_len(struct aead_request *req, u32 flags)
230{
231 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
232 struct ahash_request *ahreq = &pctx->u.ahreq;
233 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
234 be128 lengths;
235
236 lengths.a = cpu_to_be64(req->assoclen * 8);
237 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
238 memcpy(pctx->iauth_tag, &lengths, 16);
239 sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
240 ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
241 ahash_request_set_crypt(ahreq, &pctx->sg,
242 pctx->iauth_tag, sizeof(lengths));
243
244 return crypto_ahash_finup(ahreq);
245}
246
247static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
248{
249 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
250 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
251
252 return gctx->complete(req, flags);
253}
254
255static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
256{
257 struct aead_request *req = areq->data;
258
259 if (err)
260 goto out;
261
262 err = gcm_hash_len_continue(req, 0);
263 if (err == -EINPROGRESS)
264 return;
265
266out:
267 aead_request_complete(req, err);
268}
269
270static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
271{
272 return gcm_hash_len(req, flags) ?:
273 gcm_hash_len_continue(req, flags);
274}
275
276static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
277 int err)
278{
279 struct aead_request *req = areq->data;
280
281 if (err)
282 goto out;
283
284 err = gcm_hash_crypt_remain_continue(req, 0);
285 if (err == -EINPROGRESS)
286 return;
287
288out:
289 aead_request_complete(req, err);
290}
291
292static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
293{
294 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
295 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
296 unsigned int remain;
297
298 remain = gcm_remain(gctx->cryptlen);
299 if (remain)
300 return gcm_hash_remain(req, remain,
301 gcm_hash_crypt_remain_done, flags) ?:
302 gcm_hash_crypt_remain_continue(req, flags);
303
304 return gcm_hash_crypt_remain_continue(req, flags);
305}
306
307static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
308{
309 struct aead_request *req = areq->data;
310
311 if (err)
312 goto out;
313
314 err = gcm_hash_crypt_continue(req, 0);
315 if (err == -EINPROGRESS)
316 return;
317
318out:
319 aead_request_complete(req, err);
320}
321
322static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
323{
324 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
325 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
326
327 if (gctx->cryptlen)
328 return gcm_hash_update(req, gcm_hash_crypt_done,
329 gctx->src, gctx->cryptlen, flags) ?:
330 gcm_hash_crypt_continue(req, flags);
331
332 return gcm_hash_crypt_remain_continue(req, flags);
333}
334
335static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
336 int err)
337{
338 struct aead_request *req = areq->data;
339
340 if (err)
341 goto out;
342
343 err = gcm_hash_assoc_remain_continue(req, 0);
344 if (err == -EINPROGRESS)
345 return;
346
347out:
348 aead_request_complete(req, err);
349}
350
351static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
352{
353 unsigned int remain;
354
355 remain = gcm_remain(req->assoclen);
356 if (remain)
357 return gcm_hash_remain(req, remain,
358 gcm_hash_assoc_remain_done, flags) ?:
359 gcm_hash_assoc_remain_continue(req, flags);
360
361 return gcm_hash_assoc_remain_continue(req, flags);
362}
363
364static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
365{
366 struct aead_request *req = areq->data;
367
368 if (err)
369 goto out;
370
371 err = gcm_hash_assoc_continue(req, 0);
372 if (err == -EINPROGRESS)
373 return;
374
375out:
376 aead_request_complete(req, err);
377}
378
379static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
380{
381 if (req->assoclen)
382 return gcm_hash_update(req, gcm_hash_assoc_done,
383 req->src, req->assoclen, flags) ?:
384 gcm_hash_assoc_continue(req, flags);
385
386 return gcm_hash_assoc_remain_continue(req, flags);
387}
388
389static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
390{
391 struct aead_request *req = areq->data;
392
393 if (err)
394 goto out;
395
396 err = gcm_hash_init_continue(req, 0);
397 if (err == -EINPROGRESS)
398 return;
399
400out:
401 aead_request_complete(req, err);
402}
403
404static int gcm_hash(struct aead_request *req, u32 flags)
405{
406 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
407 struct ahash_request *ahreq = &pctx->u.ahreq;
408 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
409
410 ahash_request_set_tfm(ahreq, ctx->ghash);
411
412 ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
413 return crypto_ahash_init(ahreq) ?:
414 gcm_hash_init_continue(req, flags);
415}
416
417static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
418{
419 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
420 struct crypto_aead *aead = crypto_aead_reqtfm(req);
421 u8 *auth_tag = pctx->auth_tag;
422
423 crypto_xor(auth_tag, pctx->iauth_tag, 16);
424 scatterwalk_map_and_copy(auth_tag, req->dst,
425 req->assoclen + req->cryptlen,
426 crypto_aead_authsize(aead), 1);
427 return 0;
428}
429
430static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
431{
432 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
433 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
434
435 gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
436 gctx->cryptlen = req->cryptlen;
437 gctx->complete = gcm_enc_copy_hash;
438
439 return gcm_hash(req, flags);
440}
441
442static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
443{
444 struct aead_request *req = areq->data;
445
446 if (err)
447 goto out;
448
449 err = gcm_encrypt_continue(req, 0);
450 if (err == -EINPROGRESS)
451 return;
452
453out:
454 aead_request_complete(req, err);
455}
456
457static int crypto_gcm_encrypt(struct aead_request *req)
458{
459 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
460 struct skcipher_request *skreq = &pctx->u.skreq;
461 u32 flags = aead_request_flags(req);
462
463 crypto_gcm_init_common(req);
464 crypto_gcm_init_crypt(req, req->cryptlen);
465 skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
466
467 return crypto_skcipher_encrypt(skreq) ?:
468 gcm_encrypt_continue(req, flags);
469}
470
471static int crypto_gcm_verify(struct aead_request *req)
472{
473 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
474 struct crypto_aead *aead = crypto_aead_reqtfm(req);
475 u8 *auth_tag = pctx->auth_tag;
476 u8 *iauth_tag = pctx->iauth_tag;
477 unsigned int authsize = crypto_aead_authsize(aead);
478 unsigned int cryptlen = req->cryptlen - authsize;
479
480 crypto_xor(auth_tag, iauth_tag, 16);
481 scatterwalk_map_and_copy(iauth_tag, req->src,
482 req->assoclen + cryptlen, authsize, 0);
483 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
484}
485
486static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
487{
488 struct aead_request *req = areq->data;
489
490 if (!err)
491 err = crypto_gcm_verify(req);
492
493 aead_request_complete(req, err);
494}
495
496static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
497{
498 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
499 struct skcipher_request *skreq = &pctx->u.skreq;
500 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
501
502 crypto_gcm_init_crypt(req, gctx->cryptlen);
503 skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
504 return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
505}
506
507static int crypto_gcm_decrypt(struct aead_request *req)
508{
509 struct crypto_aead *aead = crypto_aead_reqtfm(req);
510 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
511 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
512 unsigned int authsize = crypto_aead_authsize(aead);
513 unsigned int cryptlen = req->cryptlen;
514 u32 flags = aead_request_flags(req);
515
516 cryptlen -= authsize;
517
518 crypto_gcm_init_common(req);
519
520 gctx->src = sg_next(pctx->src);
521 gctx->cryptlen = cryptlen;
522 gctx->complete = gcm_dec_hash_continue;
523
524 return gcm_hash(req, flags);
525}
526
527static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
528{
529 struct aead_instance *inst = aead_alg_instance(tfm);
530 struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
531 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
532 struct crypto_skcipher *ctr;
533 struct crypto_ahash *ghash;
534 unsigned long align;
535 int err;
536
537 ghash = crypto_spawn_ahash(&ictx->ghash);
538 if (IS_ERR(ghash))
539 return PTR_ERR(ghash);
540
541 ctr = crypto_spawn_skcipher(&ictx->ctr);
542 err = PTR_ERR(ctr);
543 if (IS_ERR(ctr))
544 goto err_free_hash;
545
546 ctx->ctr = ctr;
547 ctx->ghash = ghash;
548
549 align = crypto_aead_alignmask(tfm);
550 align &= ~(crypto_tfm_ctx_alignment() - 1);
551 crypto_aead_set_reqsize(tfm,
552 align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
553 max(sizeof(struct skcipher_request) +
554 crypto_skcipher_reqsize(ctr),
555 sizeof(struct ahash_request) +
556 crypto_ahash_reqsize(ghash)));
557
558 return 0;
559
560err_free_hash:
561 crypto_free_ahash(ghash);
562 return err;
563}
564
565static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
566{
567 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
568
569 crypto_free_ahash(ctx->ghash);
570 crypto_free_skcipher(ctx->ctr);
571}
572
573static void crypto_gcm_free(struct aead_instance *inst)
574{
575 struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
576
577 crypto_drop_skcipher(&ctx->ctr);
578 crypto_drop_ahash(&ctx->ghash);
579 kfree(inst);
580}
581
582static int crypto_gcm_create_common(struct crypto_template *tmpl,
583 struct rtattr **tb,
584 const char *ctr_name,
585 const char *ghash_name)
586{
587 struct crypto_attr_type *algt;
588 struct aead_instance *inst;
589 struct skcipher_alg *ctr;
590 struct crypto_alg *ghash_alg;
591 struct hash_alg_common *ghash;
592 struct gcm_instance_ctx *ctx;
593 int err;
594
595 algt = crypto_get_attr_type(tb);
596 if (IS_ERR(algt))
597 return PTR_ERR(algt);
598
599 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
600 return -EINVAL;
601
602 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
603 CRYPTO_ALG_TYPE_HASH,
604 CRYPTO_ALG_TYPE_AHASH_MASK |
605 crypto_requires_sync(algt->type,
606 algt->mask));
607 if (IS_ERR(ghash_alg))
608 return PTR_ERR(ghash_alg);
609
610 ghash = __crypto_hash_alg_common(ghash_alg);
611
612 err = -ENOMEM;
613 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
614 if (!inst)
615 goto out_put_ghash;
616
617 ctx = aead_instance_ctx(inst);
618 err = crypto_init_ahash_spawn(&ctx->ghash, ghash,
619 aead_crypto_instance(inst));
620 if (err)
621 goto err_free_inst;
622
623 err = -EINVAL;
624 if (strcmp(ghash->base.cra_name, "ghash") != 0 ||
625 ghash->digestsize != 16)
626 goto err_drop_ghash;
627
628 crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
629 err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
630 crypto_requires_sync(algt->type,
631 algt->mask));
632 if (err)
633 goto err_drop_ghash;
634
635 ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
636
637 /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */
638 err = -EINVAL;
639 if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 ||
640 crypto_skcipher_alg_ivsize(ctr) != 16 ||
641 ctr->base.cra_blocksize != 1)
642 goto out_put_ctr;
643
644 err = -ENAMETOOLONG;
645 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
646 "gcm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME)
647 goto out_put_ctr;
648
649 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
650 "gcm_base(%s,%s)", ctr->base.cra_driver_name,
651 ghash_alg->cra_driver_name) >=
652 CRYPTO_MAX_ALG_NAME)
653 goto out_put_ctr;
654
655 inst->alg.base.cra_flags = (ghash->base.cra_flags |
656 ctr->base.cra_flags) & CRYPTO_ALG_ASYNC;
657 inst->alg.base.cra_priority = (ghash->base.cra_priority +
658 ctr->base.cra_priority) / 2;
659 inst->alg.base.cra_blocksize = 1;
660 inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
661 ctr->base.cra_alignmask;
662 inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
663 inst->alg.ivsize = GCM_AES_IV_SIZE;
664 inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
665 inst->alg.maxauthsize = 16;
666 inst->alg.init = crypto_gcm_init_tfm;
667 inst->alg.exit = crypto_gcm_exit_tfm;
668 inst->alg.setkey = crypto_gcm_setkey;
669 inst->alg.setauthsize = crypto_gcm_setauthsize;
670 inst->alg.encrypt = crypto_gcm_encrypt;
671 inst->alg.decrypt = crypto_gcm_decrypt;
672
673 inst->free = crypto_gcm_free;
674
675 err = aead_register_instance(tmpl, inst);
676 if (err)
677 goto out_put_ctr;
678
679out_put_ghash:
680 crypto_mod_put(ghash_alg);
681 return err;
682
683out_put_ctr:
684 crypto_drop_skcipher(&ctx->ctr);
685err_drop_ghash:
686 crypto_drop_ahash(&ctx->ghash);
687err_free_inst:
688 kfree(inst);
689 goto out_put_ghash;
690}
691
692static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
693{
694 const char *cipher_name;
695 char ctr_name[CRYPTO_MAX_ALG_NAME];
696
697 cipher_name = crypto_attr_alg_name(tb[1]);
698 if (IS_ERR(cipher_name))
699 return PTR_ERR(cipher_name);
700
701 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
702 CRYPTO_MAX_ALG_NAME)
703 return -ENAMETOOLONG;
704
705 return crypto_gcm_create_common(tmpl, tb, ctr_name, "ghash");
706}
707
708static int crypto_gcm_base_create(struct crypto_template *tmpl,
709 struct rtattr **tb)
710{
711 const char *ctr_name;
712 const char *ghash_name;
713
714 ctr_name = crypto_attr_alg_name(tb[1]);
715 if (IS_ERR(ctr_name))
716 return PTR_ERR(ctr_name);
717
718 ghash_name = crypto_attr_alg_name(tb[2]);
719 if (IS_ERR(ghash_name))
720 return PTR_ERR(ghash_name);
721
722 return crypto_gcm_create_common(tmpl, tb, ctr_name, ghash_name);
723}
724
725static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
726 unsigned int keylen)
727{
728 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
729 struct crypto_aead *child = ctx->child;
730 int err;
731
732 if (keylen < 4)
733 return -EINVAL;
734
735 keylen -= 4;
736 memcpy(ctx->nonce, key + keylen, 4);
737
738 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
739 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
740 CRYPTO_TFM_REQ_MASK);
741 err = crypto_aead_setkey(child, key, keylen);
742 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
743 CRYPTO_TFM_RES_MASK);
744
745 return err;
746}
747
748static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
749 unsigned int authsize)
750{
751 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
752 int err;
753
754 err = crypto_rfc4106_check_authsize(authsize);
755 if (err)
756 return err;
757
758 return crypto_aead_setauthsize(ctx->child, authsize);
759}
760
761static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
762{
763 struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
764 struct crypto_aead *aead = crypto_aead_reqtfm(req);
765 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
766 struct aead_request *subreq = &rctx->subreq;
767 struct crypto_aead *child = ctx->child;
768 struct scatterlist *sg;
769 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
770 crypto_aead_alignmask(child) + 1);
771
772 scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
773
774 memcpy(iv, ctx->nonce, 4);
775 memcpy(iv + 4, req->iv, 8);
776
777 sg_init_table(rctx->src, 3);
778 sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
779 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
780 if (sg != rctx->src + 1)
781 sg_chain(rctx->src, 2, sg);
782
783 if (req->src != req->dst) {
784 sg_init_table(rctx->dst, 3);
785 sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
786 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
787 if (sg != rctx->dst + 1)
788 sg_chain(rctx->dst, 2, sg);
789 }
790
791 aead_request_set_tfm(subreq, child);
792 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
793 req->base.data);
794 aead_request_set_crypt(subreq, rctx->src,
795 req->src == req->dst ? rctx->src : rctx->dst,
796 req->cryptlen, iv);
797 aead_request_set_ad(subreq, req->assoclen - 8);
798
799 return subreq;
800}
801
802static int crypto_rfc4106_encrypt(struct aead_request *req)
803{
804 int err;
805
806 err = crypto_ipsec_check_assoclen(req->assoclen);
807 if (err)
808 return err;
809
810 req = crypto_rfc4106_crypt(req);
811
812 return crypto_aead_encrypt(req);
813}
814
815static int crypto_rfc4106_decrypt(struct aead_request *req)
816{
817 int err;
818
819 err = crypto_ipsec_check_assoclen(req->assoclen);
820 if (err)
821 return err;
822
823 req = crypto_rfc4106_crypt(req);
824
825 return crypto_aead_decrypt(req);
826}
827
828static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
829{
830 struct aead_instance *inst = aead_alg_instance(tfm);
831 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
832 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
833 struct crypto_aead *aead;
834 unsigned long align;
835
836 aead = crypto_spawn_aead(spawn);
837 if (IS_ERR(aead))
838 return PTR_ERR(aead);
839
840 ctx->child = aead;
841
842 align = crypto_aead_alignmask(aead);
843 align &= ~(crypto_tfm_ctx_alignment() - 1);
844 crypto_aead_set_reqsize(
845 tfm,
846 sizeof(struct crypto_rfc4106_req_ctx) +
847 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
848 align + 24);
849
850 return 0;
851}
852
853static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
854{
855 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
856
857 crypto_free_aead(ctx->child);
858}
859
860static void crypto_rfc4106_free(struct aead_instance *inst)
861{
862 crypto_drop_aead(aead_instance_ctx(inst));
863 kfree(inst);
864}
865
866static int crypto_rfc4106_create(struct crypto_template *tmpl,
867 struct rtattr **tb)
868{
869 struct crypto_attr_type *algt;
870 struct aead_instance *inst;
871 struct crypto_aead_spawn *spawn;
872 struct aead_alg *alg;
873 const char *ccm_name;
874 int err;
875
876 algt = crypto_get_attr_type(tb);
877 if (IS_ERR(algt))
878 return PTR_ERR(algt);
879
880 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
881 return -EINVAL;
882
883 ccm_name = crypto_attr_alg_name(tb[1]);
884 if (IS_ERR(ccm_name))
885 return PTR_ERR(ccm_name);
886
887 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
888 if (!inst)
889 return -ENOMEM;
890
891 spawn = aead_instance_ctx(inst);
892 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
893 err = crypto_grab_aead(spawn, ccm_name, 0,
894 crypto_requires_sync(algt->type, algt->mask));
895 if (err)
896 goto out_free_inst;
897
898 alg = crypto_spawn_aead_alg(spawn);
899
900 err = -EINVAL;
901
902 /* Underlying IV size must be 12. */
903 if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
904 goto out_drop_alg;
905
906 /* Not a stream cipher? */
907 if (alg->base.cra_blocksize != 1)
908 goto out_drop_alg;
909
910 err = -ENAMETOOLONG;
911 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
912 "rfc4106(%s)", alg->base.cra_name) >=
913 CRYPTO_MAX_ALG_NAME ||
914 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
915 "rfc4106(%s)", alg->base.cra_driver_name) >=
916 CRYPTO_MAX_ALG_NAME)
917 goto out_drop_alg;
918
919 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
920 inst->alg.base.cra_priority = alg->base.cra_priority;
921 inst->alg.base.cra_blocksize = 1;
922 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
923
924 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
925
926 inst->alg.ivsize = GCM_RFC4106_IV_SIZE;
927 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
928 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
929
930 inst->alg.init = crypto_rfc4106_init_tfm;
931 inst->alg.exit = crypto_rfc4106_exit_tfm;
932
933 inst->alg.setkey = crypto_rfc4106_setkey;
934 inst->alg.setauthsize = crypto_rfc4106_setauthsize;
935 inst->alg.encrypt = crypto_rfc4106_encrypt;
936 inst->alg.decrypt = crypto_rfc4106_decrypt;
937
938 inst->free = crypto_rfc4106_free;
939
940 err = aead_register_instance(tmpl, inst);
941 if (err)
942 goto out_drop_alg;
943
944out:
945 return err;
946
947out_drop_alg:
948 crypto_drop_aead(spawn);
949out_free_inst:
950 kfree(inst);
951 goto out;
952}
953
954static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
955 unsigned int keylen)
956{
957 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
958 struct crypto_aead *child = ctx->child;
959 int err;
960
961 if (keylen < 4)
962 return -EINVAL;
963
964 keylen -= 4;
965 memcpy(ctx->nonce, key + keylen, 4);
966
967 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
968 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
969 CRYPTO_TFM_REQ_MASK);
970 err = crypto_aead_setkey(child, key, keylen);
971 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
972 CRYPTO_TFM_RES_MASK);
973
974 return err;
975}
976
977static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
978 unsigned int authsize)
979{
980 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
981
982 if (authsize != 16)
983 return -EINVAL;
984
985 return crypto_aead_setauthsize(ctx->child, authsize);
986}
987
988static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
989{
990 struct crypto_aead *aead = crypto_aead_reqtfm(req);
991 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
992 struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
993 struct aead_request *subreq = &rctx->subreq;
994 unsigned int authsize = crypto_aead_authsize(aead);
995 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
996 crypto_aead_alignmask(ctx->child) + 1);
997 int err;
998
999 if (req->src != req->dst) {
1000 err = crypto_rfc4543_copy_src_to_dst(req, enc);
1001 if (err)
1002 return err;
1003 }
1004
1005 memcpy(iv, ctx->nonce, 4);
1006 memcpy(iv + 4, req->iv, 8);
1007
1008 aead_request_set_tfm(subreq, ctx->child);
1009 aead_request_set_callback(subreq, req->base.flags,
1010 req->base.complete, req->base.data);
1011 aead_request_set_crypt(subreq, req->src, req->dst,
1012 enc ? 0 : authsize, iv);
1013 aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
1014 subreq->cryptlen);
1015
1016 return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
1017}
1018
1019static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1020{
1021 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1022 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1023 unsigned int authsize = crypto_aead_authsize(aead);
1024 unsigned int nbytes = req->assoclen + req->cryptlen -
1025 (enc ? 0 : authsize);
1026 SYNC_SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
1027
1028 skcipher_request_set_sync_tfm(nreq, ctx->null);
1029 skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
1030 skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
1031
1032 return crypto_skcipher_encrypt(nreq);
1033}
1034
1035static int crypto_rfc4543_encrypt(struct aead_request *req)
1036{
1037 return crypto_ipsec_check_assoclen(req->assoclen) ?:
1038 crypto_rfc4543_crypt(req, true);
1039}
1040
1041static int crypto_rfc4543_decrypt(struct aead_request *req)
1042{
1043 return crypto_ipsec_check_assoclen(req->assoclen) ?:
1044 crypto_rfc4543_crypt(req, false);
1045}
1046
1047static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
1048{
1049 struct aead_instance *inst = aead_alg_instance(tfm);
1050 struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
1051 struct crypto_aead_spawn *spawn = &ictx->aead;
1052 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1053 struct crypto_aead *aead;
1054 struct crypto_sync_skcipher *null;
1055 unsigned long align;
1056 int err = 0;
1057
1058 aead = crypto_spawn_aead(spawn);
1059 if (IS_ERR(aead))
1060 return PTR_ERR(aead);
1061
1062 null = crypto_get_default_null_skcipher();
1063 err = PTR_ERR(null);
1064 if (IS_ERR(null))
1065 goto err_free_aead;
1066
1067 ctx->child = aead;
1068 ctx->null = null;
1069
1070 align = crypto_aead_alignmask(aead);
1071 align &= ~(crypto_tfm_ctx_alignment() - 1);
1072 crypto_aead_set_reqsize(
1073 tfm,
1074 sizeof(struct crypto_rfc4543_req_ctx) +
1075 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1076 align + GCM_AES_IV_SIZE);
1077
1078 return 0;
1079
1080err_free_aead:
1081 crypto_free_aead(aead);
1082 return err;
1083}
1084
1085static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1086{
1087 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1088
1089 crypto_free_aead(ctx->child);
1090 crypto_put_default_null_skcipher();
1091}
1092
1093static void crypto_rfc4543_free(struct aead_instance *inst)
1094{
1095 struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1096
1097 crypto_drop_aead(&ctx->aead);
1098
1099 kfree(inst);
1100}
1101
1102static int crypto_rfc4543_create(struct crypto_template *tmpl,
1103 struct rtattr **tb)
1104{
1105 struct crypto_attr_type *algt;
1106 struct aead_instance *inst;
1107 struct crypto_aead_spawn *spawn;
1108 struct aead_alg *alg;
1109 struct crypto_rfc4543_instance_ctx *ctx;
1110 const char *ccm_name;
1111 int err;
1112
1113 algt = crypto_get_attr_type(tb);
1114 if (IS_ERR(algt))
1115 return PTR_ERR(algt);
1116
1117 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1118 return -EINVAL;
1119
1120 ccm_name = crypto_attr_alg_name(tb[1]);
1121 if (IS_ERR(ccm_name))
1122 return PTR_ERR(ccm_name);
1123
1124 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1125 if (!inst)
1126 return -ENOMEM;
1127
1128 ctx = aead_instance_ctx(inst);
1129 spawn = &ctx->aead;
1130 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
1131 err = crypto_grab_aead(spawn, ccm_name, 0,
1132 crypto_requires_sync(algt->type, algt->mask));
1133 if (err)
1134 goto out_free_inst;
1135
1136 alg = crypto_spawn_aead_alg(spawn);
1137
1138 err = -EINVAL;
1139
1140 /* Underlying IV size must be 12. */
1141 if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
1142 goto out_drop_alg;
1143
1144 /* Not a stream cipher? */
1145 if (alg->base.cra_blocksize != 1)
1146 goto out_drop_alg;
1147
1148 err = -ENAMETOOLONG;
1149 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1150 "rfc4543(%s)", alg->base.cra_name) >=
1151 CRYPTO_MAX_ALG_NAME ||
1152 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1153 "rfc4543(%s)", alg->base.cra_driver_name) >=
1154 CRYPTO_MAX_ALG_NAME)
1155 goto out_drop_alg;
1156
1157 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1158 inst->alg.base.cra_priority = alg->base.cra_priority;
1159 inst->alg.base.cra_blocksize = 1;
1160 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1161
1162 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1163
1164 inst->alg.ivsize = GCM_RFC4543_IV_SIZE;
1165 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
1166 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1167
1168 inst->alg.init = crypto_rfc4543_init_tfm;
1169 inst->alg.exit = crypto_rfc4543_exit_tfm;
1170
1171 inst->alg.setkey = crypto_rfc4543_setkey;
1172 inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1173 inst->alg.encrypt = crypto_rfc4543_encrypt;
1174 inst->alg.decrypt = crypto_rfc4543_decrypt;
1175
1176 inst->free = crypto_rfc4543_free,
1177
1178 err = aead_register_instance(tmpl, inst);
1179 if (err)
1180 goto out_drop_alg;
1181
1182out:
1183 return err;
1184
1185out_drop_alg:
1186 crypto_drop_aead(spawn);
1187out_free_inst:
1188 kfree(inst);
1189 goto out;
1190}
1191
1192static struct crypto_template crypto_gcm_tmpls[] = {
1193 {
1194 .name = "gcm_base",
1195 .create = crypto_gcm_base_create,
1196 .module = THIS_MODULE,
1197 }, {
1198 .name = "gcm",
1199 .create = crypto_gcm_create,
1200 .module = THIS_MODULE,
1201 }, {
1202 .name = "rfc4106",
1203 .create = crypto_rfc4106_create,
1204 .module = THIS_MODULE,
1205 }, {
1206 .name = "rfc4543",
1207 .create = crypto_rfc4543_create,
1208 .module = THIS_MODULE,
1209 },
1210};
1211
1212static int __init crypto_gcm_module_init(void)
1213{
1214 int err;
1215
1216 gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1217 if (!gcm_zeroes)
1218 return -ENOMEM;
1219
1220 sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1221
1222 err = crypto_register_templates(crypto_gcm_tmpls,
1223 ARRAY_SIZE(crypto_gcm_tmpls));
1224 if (err)
1225 kfree(gcm_zeroes);
1226
1227 return err;
1228}
1229
1230static void __exit crypto_gcm_module_exit(void)
1231{
1232 kfree(gcm_zeroes);
1233 crypto_unregister_templates(crypto_gcm_tmpls,
1234 ARRAY_SIZE(crypto_gcm_tmpls));
1235}
1236
1237subsys_initcall(crypto_gcm_module_init);
1238module_exit(crypto_gcm_module_exit);
1239
1240MODULE_LICENSE("GPL");
1241MODULE_DESCRIPTION("Galois/Counter Mode");
1242MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1243MODULE_ALIAS_CRYPTO("gcm_base");
1244MODULE_ALIAS_CRYPTO("rfc4106");
1245MODULE_ALIAS_CRYPTO("rfc4543");
1246MODULE_ALIAS_CRYPTO("gcm");
1/*
2 * GCM: Galois/Counter Mode.
3 *
4 * Copyright (c) 2007 Nokia Siemens Networks - Mikko Herranen <mh1@iki.fi>
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 version 2 as published
8 * by the Free Software Foundation.
9 */
10
11#include <crypto/gf128mul.h>
12#include <crypto/internal/aead.h>
13#include <crypto/internal/skcipher.h>
14#include <crypto/internal/hash.h>
15#include <crypto/scatterwalk.h>
16#include <crypto/hash.h>
17#include "internal.h"
18#include <linux/completion.h>
19#include <linux/err.h>
20#include <linux/init.h>
21#include <linux/kernel.h>
22#include <linux/module.h>
23#include <linux/slab.h>
24
25struct gcm_instance_ctx {
26 struct crypto_skcipher_spawn ctr;
27 struct crypto_ahash_spawn ghash;
28};
29
30struct crypto_gcm_ctx {
31 struct crypto_ablkcipher *ctr;
32 struct crypto_ahash *ghash;
33};
34
35struct crypto_rfc4106_ctx {
36 struct crypto_aead *child;
37 u8 nonce[4];
38};
39
40struct crypto_rfc4543_ctx {
41 struct crypto_aead *child;
42 u8 nonce[4];
43};
44
45struct crypto_rfc4543_req_ctx {
46 u8 auth_tag[16];
47 struct scatterlist cipher[1];
48 struct scatterlist payload[2];
49 struct scatterlist assoc[2];
50 struct aead_request subreq;
51};
52
53struct crypto_gcm_ghash_ctx {
54 unsigned int cryptlen;
55 struct scatterlist *src;
56 void (*complete)(struct aead_request *req, int err);
57};
58
59struct crypto_gcm_req_priv_ctx {
60 u8 auth_tag[16];
61 u8 iauth_tag[16];
62 struct scatterlist src[2];
63 struct scatterlist dst[2];
64 struct crypto_gcm_ghash_ctx ghash_ctx;
65 union {
66 struct ahash_request ahreq;
67 struct ablkcipher_request abreq;
68 } u;
69};
70
71struct crypto_gcm_setkey_result {
72 int err;
73 struct completion completion;
74};
75
76static void *gcm_zeroes;
77
78static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
79 struct aead_request *req)
80{
81 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
82
83 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
84}
85
86static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
87{
88 struct crypto_gcm_setkey_result *result = req->data;
89
90 if (err == -EINPROGRESS)
91 return;
92
93 result->err = err;
94 complete(&result->completion);
95}
96
97static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
98 unsigned int keylen)
99{
100 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
101 struct crypto_ahash *ghash = ctx->ghash;
102 struct crypto_ablkcipher *ctr = ctx->ctr;
103 struct {
104 be128 hash;
105 u8 iv[8];
106
107 struct crypto_gcm_setkey_result result;
108
109 struct scatterlist sg[1];
110 struct ablkcipher_request req;
111 } *data;
112 int err;
113
114 crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
115 crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
116 CRYPTO_TFM_REQ_MASK);
117
118 err = crypto_ablkcipher_setkey(ctr, key, keylen);
119 if (err)
120 return err;
121
122 crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
123 CRYPTO_TFM_RES_MASK);
124
125 data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
126 GFP_KERNEL);
127 if (!data)
128 return -ENOMEM;
129
130 init_completion(&data->result.completion);
131 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
132 ablkcipher_request_set_tfm(&data->req, ctr);
133 ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
134 CRYPTO_TFM_REQ_MAY_BACKLOG,
135 crypto_gcm_setkey_done,
136 &data->result);
137 ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
138 sizeof(data->hash), data->iv);
139
140 err = crypto_ablkcipher_encrypt(&data->req);
141 if (err == -EINPROGRESS || err == -EBUSY) {
142 err = wait_for_completion_interruptible(
143 &data->result.completion);
144 if (!err)
145 err = data->result.err;
146 }
147
148 if (err)
149 goto out;
150
151 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
152 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
153 CRYPTO_TFM_REQ_MASK);
154 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
155 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
156 CRYPTO_TFM_RES_MASK);
157
158out:
159 kfree(data);
160 return err;
161}
162
163static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
164 unsigned int authsize)
165{
166 switch (authsize) {
167 case 4:
168 case 8:
169 case 12:
170 case 13:
171 case 14:
172 case 15:
173 case 16:
174 break;
175 default:
176 return -EINVAL;
177 }
178
179 return 0;
180}
181
182static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
183 struct aead_request *req,
184 unsigned int cryptlen)
185{
186 struct crypto_aead *aead = crypto_aead_reqtfm(req);
187 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
188 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
189 struct scatterlist *dst;
190 __be32 counter = cpu_to_be32(1);
191
192 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
193 memcpy(req->iv + 12, &counter, 4);
194
195 sg_init_table(pctx->src, 2);
196 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
197 scatterwalk_sg_chain(pctx->src, 2, req->src);
198
199 dst = pctx->src;
200 if (req->src != req->dst) {
201 sg_init_table(pctx->dst, 2);
202 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
203 scatterwalk_sg_chain(pctx->dst, 2, req->dst);
204 dst = pctx->dst;
205 }
206
207 ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
208 ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
209 cryptlen + sizeof(pctx->auth_tag),
210 req->iv);
211}
212
213static inline unsigned int gcm_remain(unsigned int len)
214{
215 len &= 0xfU;
216 return len ? 16 - len : 0;
217}
218
219static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
220static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
221
222static int gcm_hash_update(struct aead_request *req,
223 struct crypto_gcm_req_priv_ctx *pctx,
224 crypto_completion_t complete,
225 struct scatterlist *src,
226 unsigned int len)
227{
228 struct ahash_request *ahreq = &pctx->u.ahreq;
229
230 ahash_request_set_callback(ahreq, aead_request_flags(req),
231 complete, req);
232 ahash_request_set_crypt(ahreq, src, NULL, len);
233
234 return crypto_ahash_update(ahreq);
235}
236
237static int gcm_hash_remain(struct aead_request *req,
238 struct crypto_gcm_req_priv_ctx *pctx,
239 unsigned int remain,
240 crypto_completion_t complete)
241{
242 struct ahash_request *ahreq = &pctx->u.ahreq;
243
244 ahash_request_set_callback(ahreq, aead_request_flags(req),
245 complete, req);
246 sg_init_one(pctx->src, gcm_zeroes, remain);
247 ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
248
249 return crypto_ahash_update(ahreq);
250}
251
252static int gcm_hash_len(struct aead_request *req,
253 struct crypto_gcm_req_priv_ctx *pctx)
254{
255 struct ahash_request *ahreq = &pctx->u.ahreq;
256 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
257 u128 lengths;
258
259 lengths.a = cpu_to_be64(req->assoclen * 8);
260 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
261 memcpy(pctx->iauth_tag, &lengths, 16);
262 sg_init_one(pctx->src, pctx->iauth_tag, 16);
263 ahash_request_set_callback(ahreq, aead_request_flags(req),
264 gcm_hash_len_done, req);
265 ahash_request_set_crypt(ahreq, pctx->src,
266 NULL, sizeof(lengths));
267
268 return crypto_ahash_update(ahreq);
269}
270
271static int gcm_hash_final(struct aead_request *req,
272 struct crypto_gcm_req_priv_ctx *pctx)
273{
274 struct ahash_request *ahreq = &pctx->u.ahreq;
275
276 ahash_request_set_callback(ahreq, aead_request_flags(req),
277 gcm_hash_final_done, req);
278 ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
279
280 return crypto_ahash_final(ahreq);
281}
282
283static void __gcm_hash_final_done(struct aead_request *req, int err)
284{
285 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
286 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
287
288 if (!err)
289 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
290
291 gctx->complete(req, err);
292}
293
294static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
295{
296 struct aead_request *req = areq->data;
297
298 __gcm_hash_final_done(req, err);
299}
300
301static void __gcm_hash_len_done(struct aead_request *req, int err)
302{
303 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
304
305 if (!err) {
306 err = gcm_hash_final(req, pctx);
307 if (err == -EINPROGRESS || err == -EBUSY)
308 return;
309 }
310
311 __gcm_hash_final_done(req, err);
312}
313
314static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
315{
316 struct aead_request *req = areq->data;
317
318 __gcm_hash_len_done(req, err);
319}
320
321static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
322{
323 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
324
325 if (!err) {
326 err = gcm_hash_len(req, pctx);
327 if (err == -EINPROGRESS || err == -EBUSY)
328 return;
329 }
330
331 __gcm_hash_len_done(req, err);
332}
333
334static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
335 int err)
336{
337 struct aead_request *req = areq->data;
338
339 __gcm_hash_crypt_remain_done(req, err);
340}
341
342static void __gcm_hash_crypt_done(struct aead_request *req, int err)
343{
344 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
345 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
346 unsigned int remain;
347
348 if (!err) {
349 remain = gcm_remain(gctx->cryptlen);
350 BUG_ON(!remain);
351 err = gcm_hash_remain(req, pctx, remain,
352 gcm_hash_crypt_remain_done);
353 if (err == -EINPROGRESS || err == -EBUSY)
354 return;
355 }
356
357 __gcm_hash_crypt_remain_done(req, err);
358}
359
360static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
361{
362 struct aead_request *req = areq->data;
363
364 __gcm_hash_crypt_done(req, err);
365}
366
367static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
368{
369 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
370 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
371 crypto_completion_t complete;
372 unsigned int remain = 0;
373
374 if (!err && gctx->cryptlen) {
375 remain = gcm_remain(gctx->cryptlen);
376 complete = remain ? gcm_hash_crypt_done :
377 gcm_hash_crypt_remain_done;
378 err = gcm_hash_update(req, pctx, complete,
379 gctx->src, gctx->cryptlen);
380 if (err == -EINPROGRESS || err == -EBUSY)
381 return;
382 }
383
384 if (remain)
385 __gcm_hash_crypt_done(req, err);
386 else
387 __gcm_hash_crypt_remain_done(req, err);
388}
389
390static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
391 int err)
392{
393 struct aead_request *req = areq->data;
394
395 __gcm_hash_assoc_remain_done(req, err);
396}
397
398static void __gcm_hash_assoc_done(struct aead_request *req, int err)
399{
400 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
401 unsigned int remain;
402
403 if (!err) {
404 remain = gcm_remain(req->assoclen);
405 BUG_ON(!remain);
406 err = gcm_hash_remain(req, pctx, remain,
407 gcm_hash_assoc_remain_done);
408 if (err == -EINPROGRESS || err == -EBUSY)
409 return;
410 }
411
412 __gcm_hash_assoc_remain_done(req, err);
413}
414
415static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
416{
417 struct aead_request *req = areq->data;
418
419 __gcm_hash_assoc_done(req, err);
420}
421
422static void __gcm_hash_init_done(struct aead_request *req, int err)
423{
424 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
425 crypto_completion_t complete;
426 unsigned int remain = 0;
427
428 if (!err && req->assoclen) {
429 remain = gcm_remain(req->assoclen);
430 complete = remain ? gcm_hash_assoc_done :
431 gcm_hash_assoc_remain_done;
432 err = gcm_hash_update(req, pctx, complete,
433 req->assoc, req->assoclen);
434 if (err == -EINPROGRESS || err == -EBUSY)
435 return;
436 }
437
438 if (remain)
439 __gcm_hash_assoc_done(req, err);
440 else
441 __gcm_hash_assoc_remain_done(req, err);
442}
443
444static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
445{
446 struct aead_request *req = areq->data;
447
448 __gcm_hash_init_done(req, err);
449}
450
451static int gcm_hash(struct aead_request *req,
452 struct crypto_gcm_req_priv_ctx *pctx)
453{
454 struct ahash_request *ahreq = &pctx->u.ahreq;
455 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
456 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
457 unsigned int remain;
458 crypto_completion_t complete;
459 int err;
460
461 ahash_request_set_tfm(ahreq, ctx->ghash);
462
463 ahash_request_set_callback(ahreq, aead_request_flags(req),
464 gcm_hash_init_done, req);
465 err = crypto_ahash_init(ahreq);
466 if (err)
467 return err;
468 remain = gcm_remain(req->assoclen);
469 complete = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
470 err = gcm_hash_update(req, pctx, complete, req->assoc, req->assoclen);
471 if (err)
472 return err;
473 if (remain) {
474 err = gcm_hash_remain(req, pctx, remain,
475 gcm_hash_assoc_remain_done);
476 if (err)
477 return err;
478 }
479 remain = gcm_remain(gctx->cryptlen);
480 complete = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
481 err = gcm_hash_update(req, pctx, complete, gctx->src, gctx->cryptlen);
482 if (err)
483 return err;
484 if (remain) {
485 err = gcm_hash_remain(req, pctx, remain,
486 gcm_hash_crypt_remain_done);
487 if (err)
488 return err;
489 }
490 err = gcm_hash_len(req, pctx);
491 if (err)
492 return err;
493 err = gcm_hash_final(req, pctx);
494 if (err)
495 return err;
496
497 return 0;
498}
499
500static void gcm_enc_copy_hash(struct aead_request *req,
501 struct crypto_gcm_req_priv_ctx *pctx)
502{
503 struct crypto_aead *aead = crypto_aead_reqtfm(req);
504 u8 *auth_tag = pctx->auth_tag;
505
506 scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
507 crypto_aead_authsize(aead), 1);
508}
509
510static void gcm_enc_hash_done(struct aead_request *req, int err)
511{
512 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
513
514 if (!err)
515 gcm_enc_copy_hash(req, pctx);
516
517 aead_request_complete(req, err);
518}
519
520static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
521{
522 struct aead_request *req = areq->data;
523 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
524
525 if (!err) {
526 err = gcm_hash(req, pctx);
527 if (err == -EINPROGRESS || err == -EBUSY)
528 return;
529 else if (!err) {
530 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
531 gcm_enc_copy_hash(req, pctx);
532 }
533 }
534
535 aead_request_complete(req, err);
536}
537
538static int crypto_gcm_encrypt(struct aead_request *req)
539{
540 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
541 struct ablkcipher_request *abreq = &pctx->u.abreq;
542 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
543 int err;
544
545 crypto_gcm_init_crypt(abreq, req, req->cryptlen);
546 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
547 gcm_encrypt_done, req);
548
549 gctx->src = req->dst;
550 gctx->cryptlen = req->cryptlen;
551 gctx->complete = gcm_enc_hash_done;
552
553 err = crypto_ablkcipher_encrypt(abreq);
554 if (err)
555 return err;
556
557 err = gcm_hash(req, pctx);
558 if (err)
559 return err;
560
561 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
562 gcm_enc_copy_hash(req, pctx);
563
564 return 0;
565}
566
567static int crypto_gcm_verify(struct aead_request *req,
568 struct crypto_gcm_req_priv_ctx *pctx)
569{
570 struct crypto_aead *aead = crypto_aead_reqtfm(req);
571 u8 *auth_tag = pctx->auth_tag;
572 u8 *iauth_tag = pctx->iauth_tag;
573 unsigned int authsize = crypto_aead_authsize(aead);
574 unsigned int cryptlen = req->cryptlen - authsize;
575
576 crypto_xor(auth_tag, iauth_tag, 16);
577 scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
578 return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
579}
580
581static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
582{
583 struct aead_request *req = areq->data;
584 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
585
586 if (!err)
587 err = crypto_gcm_verify(req, pctx);
588
589 aead_request_complete(req, err);
590}
591
592static void gcm_dec_hash_done(struct aead_request *req, int err)
593{
594 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
595 struct ablkcipher_request *abreq = &pctx->u.abreq;
596 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
597
598 if (!err) {
599 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
600 gcm_decrypt_done, req);
601 crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
602 err = crypto_ablkcipher_decrypt(abreq);
603 if (err == -EINPROGRESS || err == -EBUSY)
604 return;
605 else if (!err)
606 err = crypto_gcm_verify(req, pctx);
607 }
608
609 aead_request_complete(req, err);
610}
611
612static int crypto_gcm_decrypt(struct aead_request *req)
613{
614 struct crypto_aead *aead = crypto_aead_reqtfm(req);
615 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
616 struct ablkcipher_request *abreq = &pctx->u.abreq;
617 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
618 unsigned int authsize = crypto_aead_authsize(aead);
619 unsigned int cryptlen = req->cryptlen;
620 int err;
621
622 if (cryptlen < authsize)
623 return -EINVAL;
624 cryptlen -= authsize;
625
626 gctx->src = req->src;
627 gctx->cryptlen = cryptlen;
628 gctx->complete = gcm_dec_hash_done;
629
630 err = gcm_hash(req, pctx);
631 if (err)
632 return err;
633
634 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
635 gcm_decrypt_done, req);
636 crypto_gcm_init_crypt(abreq, req, cryptlen);
637 err = crypto_ablkcipher_decrypt(abreq);
638 if (err)
639 return err;
640
641 return crypto_gcm_verify(req, pctx);
642}
643
644static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
645{
646 struct crypto_instance *inst = (void *)tfm->__crt_alg;
647 struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
648 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
649 struct crypto_ablkcipher *ctr;
650 struct crypto_ahash *ghash;
651 unsigned long align;
652 int err;
653
654 ghash = crypto_spawn_ahash(&ictx->ghash);
655 if (IS_ERR(ghash))
656 return PTR_ERR(ghash);
657
658 ctr = crypto_spawn_skcipher(&ictx->ctr);
659 err = PTR_ERR(ctr);
660 if (IS_ERR(ctr))
661 goto err_free_hash;
662
663 ctx->ctr = ctr;
664 ctx->ghash = ghash;
665
666 align = crypto_tfm_alg_alignmask(tfm);
667 align &= ~(crypto_tfm_ctx_alignment() - 1);
668 tfm->crt_aead.reqsize = align +
669 offsetof(struct crypto_gcm_req_priv_ctx, u) +
670 max(sizeof(struct ablkcipher_request) +
671 crypto_ablkcipher_reqsize(ctr),
672 sizeof(struct ahash_request) +
673 crypto_ahash_reqsize(ghash));
674
675 return 0;
676
677err_free_hash:
678 crypto_free_ahash(ghash);
679 return err;
680}
681
682static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
683{
684 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
685
686 crypto_free_ahash(ctx->ghash);
687 crypto_free_ablkcipher(ctx->ctr);
688}
689
690static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
691 const char *full_name,
692 const char *ctr_name,
693 const char *ghash_name)
694{
695 struct crypto_attr_type *algt;
696 struct crypto_instance *inst;
697 struct crypto_alg *ctr;
698 struct crypto_alg *ghash_alg;
699 struct ahash_alg *ghash_ahash_alg;
700 struct gcm_instance_ctx *ctx;
701 int err;
702
703 algt = crypto_get_attr_type(tb);
704 err = PTR_ERR(algt);
705 if (IS_ERR(algt))
706 return ERR_PTR(err);
707
708 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
709 return ERR_PTR(-EINVAL);
710
711 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
712 CRYPTO_ALG_TYPE_HASH,
713 CRYPTO_ALG_TYPE_AHASH_MASK);
714 err = PTR_ERR(ghash_alg);
715 if (IS_ERR(ghash_alg))
716 return ERR_PTR(err);
717
718 err = -ENOMEM;
719 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
720 if (!inst)
721 goto out_put_ghash;
722
723 ctx = crypto_instance_ctx(inst);
724 ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
725 err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
726 inst);
727 if (err)
728 goto err_free_inst;
729
730 crypto_set_skcipher_spawn(&ctx->ctr, inst);
731 err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
732 crypto_requires_sync(algt->type,
733 algt->mask));
734 if (err)
735 goto err_drop_ghash;
736
737 ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
738
739 /* We only support 16-byte blocks. */
740 if (ctr->cra_ablkcipher.ivsize != 16)
741 goto out_put_ctr;
742
743 /* Not a stream cipher? */
744 err = -EINVAL;
745 if (ctr->cra_blocksize != 1)
746 goto out_put_ctr;
747
748 err = -ENAMETOOLONG;
749 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
750 "gcm_base(%s,%s)", ctr->cra_driver_name,
751 ghash_alg->cra_driver_name) >=
752 CRYPTO_MAX_ALG_NAME)
753 goto out_put_ctr;
754
755 memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
756
757 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
758 inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
759 inst->alg.cra_priority = ctr->cra_priority;
760 inst->alg.cra_blocksize = 1;
761 inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
762 inst->alg.cra_type = &crypto_aead_type;
763 inst->alg.cra_aead.ivsize = 16;
764 inst->alg.cra_aead.maxauthsize = 16;
765 inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
766 inst->alg.cra_init = crypto_gcm_init_tfm;
767 inst->alg.cra_exit = crypto_gcm_exit_tfm;
768 inst->alg.cra_aead.setkey = crypto_gcm_setkey;
769 inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
770 inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
771 inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
772
773out:
774 crypto_mod_put(ghash_alg);
775 return inst;
776
777out_put_ctr:
778 crypto_drop_skcipher(&ctx->ctr);
779err_drop_ghash:
780 crypto_drop_ahash(&ctx->ghash);
781err_free_inst:
782 kfree(inst);
783out_put_ghash:
784 inst = ERR_PTR(err);
785 goto out;
786}
787
788static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
789{
790 int err;
791 const char *cipher_name;
792 char ctr_name[CRYPTO_MAX_ALG_NAME];
793 char full_name[CRYPTO_MAX_ALG_NAME];
794
795 cipher_name = crypto_attr_alg_name(tb[1]);
796 err = PTR_ERR(cipher_name);
797 if (IS_ERR(cipher_name))
798 return ERR_PTR(err);
799
800 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
801 CRYPTO_MAX_ALG_NAME)
802 return ERR_PTR(-ENAMETOOLONG);
803
804 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
805 CRYPTO_MAX_ALG_NAME)
806 return ERR_PTR(-ENAMETOOLONG);
807
808 return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash");
809}
810
811static void crypto_gcm_free(struct crypto_instance *inst)
812{
813 struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
814
815 crypto_drop_skcipher(&ctx->ctr);
816 crypto_drop_ahash(&ctx->ghash);
817 kfree(inst);
818}
819
820static struct crypto_template crypto_gcm_tmpl = {
821 .name = "gcm",
822 .alloc = crypto_gcm_alloc,
823 .free = crypto_gcm_free,
824 .module = THIS_MODULE,
825};
826
827static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
828{
829 int err;
830 const char *ctr_name;
831 const char *ghash_name;
832 char full_name[CRYPTO_MAX_ALG_NAME];
833
834 ctr_name = crypto_attr_alg_name(tb[1]);
835 err = PTR_ERR(ctr_name);
836 if (IS_ERR(ctr_name))
837 return ERR_PTR(err);
838
839 ghash_name = crypto_attr_alg_name(tb[2]);
840 err = PTR_ERR(ghash_name);
841 if (IS_ERR(ghash_name))
842 return ERR_PTR(err);
843
844 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
845 ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
846 return ERR_PTR(-ENAMETOOLONG);
847
848 return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name);
849}
850
851static struct crypto_template crypto_gcm_base_tmpl = {
852 .name = "gcm_base",
853 .alloc = crypto_gcm_base_alloc,
854 .free = crypto_gcm_free,
855 .module = THIS_MODULE,
856};
857
858static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
859 unsigned int keylen)
860{
861 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
862 struct crypto_aead *child = ctx->child;
863 int err;
864
865 if (keylen < 4)
866 return -EINVAL;
867
868 keylen -= 4;
869 memcpy(ctx->nonce, key + keylen, 4);
870
871 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
872 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
873 CRYPTO_TFM_REQ_MASK);
874 err = crypto_aead_setkey(child, key, keylen);
875 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
876 CRYPTO_TFM_RES_MASK);
877
878 return err;
879}
880
881static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
882 unsigned int authsize)
883{
884 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
885
886 switch (authsize) {
887 case 8:
888 case 12:
889 case 16:
890 break;
891 default:
892 return -EINVAL;
893 }
894
895 return crypto_aead_setauthsize(ctx->child, authsize);
896}
897
898static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
899{
900 struct aead_request *subreq = aead_request_ctx(req);
901 struct crypto_aead *aead = crypto_aead_reqtfm(req);
902 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
903 struct crypto_aead *child = ctx->child;
904 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
905 crypto_aead_alignmask(child) + 1);
906
907 memcpy(iv, ctx->nonce, 4);
908 memcpy(iv + 4, req->iv, 8);
909
910 aead_request_set_tfm(subreq, child);
911 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
912 req->base.data);
913 aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
914 aead_request_set_assoc(subreq, req->assoc, req->assoclen);
915
916 return subreq;
917}
918
919static int crypto_rfc4106_encrypt(struct aead_request *req)
920{
921 req = crypto_rfc4106_crypt(req);
922
923 return crypto_aead_encrypt(req);
924}
925
926static int crypto_rfc4106_decrypt(struct aead_request *req)
927{
928 req = crypto_rfc4106_crypt(req);
929
930 return crypto_aead_decrypt(req);
931}
932
933static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm)
934{
935 struct crypto_instance *inst = (void *)tfm->__crt_alg;
936 struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
937 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
938 struct crypto_aead *aead;
939 unsigned long align;
940
941 aead = crypto_spawn_aead(spawn);
942 if (IS_ERR(aead))
943 return PTR_ERR(aead);
944
945 ctx->child = aead;
946
947 align = crypto_aead_alignmask(aead);
948 align &= ~(crypto_tfm_ctx_alignment() - 1);
949 tfm->crt_aead.reqsize = sizeof(struct aead_request) +
950 ALIGN(crypto_aead_reqsize(aead),
951 crypto_tfm_ctx_alignment()) +
952 align + 16;
953
954 return 0;
955}
956
957static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm)
958{
959 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
960
961 crypto_free_aead(ctx->child);
962}
963
964static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
965{
966 struct crypto_attr_type *algt;
967 struct crypto_instance *inst;
968 struct crypto_aead_spawn *spawn;
969 struct crypto_alg *alg;
970 const char *ccm_name;
971 int err;
972
973 algt = crypto_get_attr_type(tb);
974 err = PTR_ERR(algt);
975 if (IS_ERR(algt))
976 return ERR_PTR(err);
977
978 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
979 return ERR_PTR(-EINVAL);
980
981 ccm_name = crypto_attr_alg_name(tb[1]);
982 err = PTR_ERR(ccm_name);
983 if (IS_ERR(ccm_name))
984 return ERR_PTR(err);
985
986 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
987 if (!inst)
988 return ERR_PTR(-ENOMEM);
989
990 spawn = crypto_instance_ctx(inst);
991 crypto_set_aead_spawn(spawn, inst);
992 err = crypto_grab_aead(spawn, ccm_name, 0,
993 crypto_requires_sync(algt->type, algt->mask));
994 if (err)
995 goto out_free_inst;
996
997 alg = crypto_aead_spawn_alg(spawn);
998
999 err = -EINVAL;
1000
1001 /* We only support 16-byte blocks. */
1002 if (alg->cra_aead.ivsize != 16)
1003 goto out_drop_alg;
1004
1005 /* Not a stream cipher? */
1006 if (alg->cra_blocksize != 1)
1007 goto out_drop_alg;
1008
1009 err = -ENAMETOOLONG;
1010 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1011 "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1012 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1013 "rfc4106(%s)", alg->cra_driver_name) >=
1014 CRYPTO_MAX_ALG_NAME)
1015 goto out_drop_alg;
1016
1017 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1018 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1019 inst->alg.cra_priority = alg->cra_priority;
1020 inst->alg.cra_blocksize = 1;
1021 inst->alg.cra_alignmask = alg->cra_alignmask;
1022 inst->alg.cra_type = &crypto_nivaead_type;
1023
1024 inst->alg.cra_aead.ivsize = 8;
1025 inst->alg.cra_aead.maxauthsize = 16;
1026
1027 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
1028
1029 inst->alg.cra_init = crypto_rfc4106_init_tfm;
1030 inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
1031
1032 inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
1033 inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
1034 inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
1035 inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
1036
1037 inst->alg.cra_aead.geniv = "seqiv";
1038
1039out:
1040 return inst;
1041
1042out_drop_alg:
1043 crypto_drop_aead(spawn);
1044out_free_inst:
1045 kfree(inst);
1046 inst = ERR_PTR(err);
1047 goto out;
1048}
1049
1050static void crypto_rfc4106_free(struct crypto_instance *inst)
1051{
1052 crypto_drop_spawn(crypto_instance_ctx(inst));
1053 kfree(inst);
1054}
1055
1056static struct crypto_template crypto_rfc4106_tmpl = {
1057 .name = "rfc4106",
1058 .alloc = crypto_rfc4106_alloc,
1059 .free = crypto_rfc4106_free,
1060 .module = THIS_MODULE,
1061};
1062
1063static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_reqctx(
1064 struct aead_request *req)
1065{
1066 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
1067
1068 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
1069}
1070
1071static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1072 unsigned int keylen)
1073{
1074 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1075 struct crypto_aead *child = ctx->child;
1076 int err;
1077
1078 if (keylen < 4)
1079 return -EINVAL;
1080
1081 keylen -= 4;
1082 memcpy(ctx->nonce, key + keylen, 4);
1083
1084 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1085 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1086 CRYPTO_TFM_REQ_MASK);
1087 err = crypto_aead_setkey(child, key, keylen);
1088 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1089 CRYPTO_TFM_RES_MASK);
1090
1091 return err;
1092}
1093
1094static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1095 unsigned int authsize)
1096{
1097 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1098
1099 if (authsize != 16)
1100 return -EINVAL;
1101
1102 return crypto_aead_setauthsize(ctx->child, authsize);
1103}
1104
1105static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
1106 int enc)
1107{
1108 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1109 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1110 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1111 struct aead_request *subreq = &rctx->subreq;
1112 struct scatterlist *dst = req->dst;
1113 struct scatterlist *cipher = rctx->cipher;
1114 struct scatterlist *payload = rctx->payload;
1115 struct scatterlist *assoc = rctx->assoc;
1116 unsigned int authsize = crypto_aead_authsize(aead);
1117 unsigned int assoclen = req->assoclen;
1118 struct page *dstp;
1119 u8 *vdst;
1120 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1121 crypto_aead_alignmask(ctx->child) + 1);
1122
1123 memcpy(iv, ctx->nonce, 4);
1124 memcpy(iv + 4, req->iv, 8);
1125
1126 /* construct cipher/plaintext */
1127 if (enc)
1128 memset(rctx->auth_tag, 0, authsize);
1129 else
1130 scatterwalk_map_and_copy(rctx->auth_tag, dst,
1131 req->cryptlen - authsize,
1132 authsize, 0);
1133
1134 sg_init_one(cipher, rctx->auth_tag, authsize);
1135
1136 /* construct the aad */
1137 dstp = sg_page(dst);
1138 vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
1139
1140 sg_init_table(payload, 2);
1141 sg_set_buf(payload, req->iv, 8);
1142 scatterwalk_crypto_chain(payload, dst, vdst == req->iv + 8, 2);
1143 assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
1144
1145 sg_init_table(assoc, 2);
1146 sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
1147 req->assoc->offset);
1148 scatterwalk_crypto_chain(assoc, payload, 0, 2);
1149
1150 aead_request_set_tfm(subreq, ctx->child);
1151 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
1152 req->base.data);
1153 aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
1154 aead_request_set_assoc(subreq, assoc, assoclen);
1155
1156 return subreq;
1157}
1158
1159static int crypto_rfc4543_encrypt(struct aead_request *req)
1160{
1161 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1162 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1163 struct aead_request *subreq;
1164 int err;
1165
1166 subreq = crypto_rfc4543_crypt(req, 1);
1167 err = crypto_aead_encrypt(subreq);
1168 if (err)
1169 return err;
1170
1171 scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
1172 crypto_aead_authsize(aead), 1);
1173
1174 return 0;
1175}
1176
1177static int crypto_rfc4543_decrypt(struct aead_request *req)
1178{
1179 req = crypto_rfc4543_crypt(req, 0);
1180
1181 return crypto_aead_decrypt(req);
1182}
1183
1184static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
1185{
1186 struct crypto_instance *inst = (void *)tfm->__crt_alg;
1187 struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
1188 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1189 struct crypto_aead *aead;
1190 unsigned long align;
1191
1192 aead = crypto_spawn_aead(spawn);
1193 if (IS_ERR(aead))
1194 return PTR_ERR(aead);
1195
1196 ctx->child = aead;
1197
1198 align = crypto_aead_alignmask(aead);
1199 align &= ~(crypto_tfm_ctx_alignment() - 1);
1200 tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
1201 ALIGN(crypto_aead_reqsize(aead),
1202 crypto_tfm_ctx_alignment()) +
1203 align + 16;
1204
1205 return 0;
1206}
1207
1208static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
1209{
1210 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1211
1212 crypto_free_aead(ctx->child);
1213}
1214
1215static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
1216{
1217 struct crypto_attr_type *algt;
1218 struct crypto_instance *inst;
1219 struct crypto_aead_spawn *spawn;
1220 struct crypto_alg *alg;
1221 const char *ccm_name;
1222 int err;
1223
1224 algt = crypto_get_attr_type(tb);
1225 err = PTR_ERR(algt);
1226 if (IS_ERR(algt))
1227 return ERR_PTR(err);
1228
1229 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1230 return ERR_PTR(-EINVAL);
1231
1232 ccm_name = crypto_attr_alg_name(tb[1]);
1233 err = PTR_ERR(ccm_name);
1234 if (IS_ERR(ccm_name))
1235 return ERR_PTR(err);
1236
1237 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
1238 if (!inst)
1239 return ERR_PTR(-ENOMEM);
1240
1241 spawn = crypto_instance_ctx(inst);
1242 crypto_set_aead_spawn(spawn, inst);
1243 err = crypto_grab_aead(spawn, ccm_name, 0,
1244 crypto_requires_sync(algt->type, algt->mask));
1245 if (err)
1246 goto out_free_inst;
1247
1248 alg = crypto_aead_spawn_alg(spawn);
1249
1250 err = -EINVAL;
1251
1252 /* We only support 16-byte blocks. */
1253 if (alg->cra_aead.ivsize != 16)
1254 goto out_drop_alg;
1255
1256 /* Not a stream cipher? */
1257 if (alg->cra_blocksize != 1)
1258 goto out_drop_alg;
1259
1260 err = -ENAMETOOLONG;
1261 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1262 "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1263 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1264 "rfc4543(%s)", alg->cra_driver_name) >=
1265 CRYPTO_MAX_ALG_NAME)
1266 goto out_drop_alg;
1267
1268 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1269 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1270 inst->alg.cra_priority = alg->cra_priority;
1271 inst->alg.cra_blocksize = 1;
1272 inst->alg.cra_alignmask = alg->cra_alignmask;
1273 inst->alg.cra_type = &crypto_nivaead_type;
1274
1275 inst->alg.cra_aead.ivsize = 8;
1276 inst->alg.cra_aead.maxauthsize = 16;
1277
1278 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1279
1280 inst->alg.cra_init = crypto_rfc4543_init_tfm;
1281 inst->alg.cra_exit = crypto_rfc4543_exit_tfm;
1282
1283 inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
1284 inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
1285 inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
1286 inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt;
1287
1288 inst->alg.cra_aead.geniv = "seqiv";
1289
1290out:
1291 return inst;
1292
1293out_drop_alg:
1294 crypto_drop_aead(spawn);
1295out_free_inst:
1296 kfree(inst);
1297 inst = ERR_PTR(err);
1298 goto out;
1299}
1300
1301static void crypto_rfc4543_free(struct crypto_instance *inst)
1302{
1303 crypto_drop_spawn(crypto_instance_ctx(inst));
1304 kfree(inst);
1305}
1306
1307static struct crypto_template crypto_rfc4543_tmpl = {
1308 .name = "rfc4543",
1309 .alloc = crypto_rfc4543_alloc,
1310 .free = crypto_rfc4543_free,
1311 .module = THIS_MODULE,
1312};
1313
1314static int __init crypto_gcm_module_init(void)
1315{
1316 int err;
1317
1318 gcm_zeroes = kzalloc(16, GFP_KERNEL);
1319 if (!gcm_zeroes)
1320 return -ENOMEM;
1321
1322 err = crypto_register_template(&crypto_gcm_base_tmpl);
1323 if (err)
1324 goto out;
1325
1326 err = crypto_register_template(&crypto_gcm_tmpl);
1327 if (err)
1328 goto out_undo_base;
1329
1330 err = crypto_register_template(&crypto_rfc4106_tmpl);
1331 if (err)
1332 goto out_undo_gcm;
1333
1334 err = crypto_register_template(&crypto_rfc4543_tmpl);
1335 if (err)
1336 goto out_undo_rfc4106;
1337
1338 return 0;
1339
1340out_undo_rfc4106:
1341 crypto_unregister_template(&crypto_rfc4106_tmpl);
1342out_undo_gcm:
1343 crypto_unregister_template(&crypto_gcm_tmpl);
1344out_undo_base:
1345 crypto_unregister_template(&crypto_gcm_base_tmpl);
1346out:
1347 kfree(gcm_zeroes);
1348 return err;
1349}
1350
1351static void __exit crypto_gcm_module_exit(void)
1352{
1353 kfree(gcm_zeroes);
1354 crypto_unregister_template(&crypto_rfc4543_tmpl);
1355 crypto_unregister_template(&crypto_rfc4106_tmpl);
1356 crypto_unregister_template(&crypto_gcm_tmpl);
1357 crypto_unregister_template(&crypto_gcm_base_tmpl);
1358}
1359
1360module_init(crypto_gcm_module_init);
1361module_exit(crypto_gcm_module_exit);
1362
1363MODULE_LICENSE("GPL");
1364MODULE_DESCRIPTION("Galois/Counter Mode");
1365MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1366MODULE_ALIAS("gcm_base");
1367MODULE_ALIAS("rfc4106");
1368MODULE_ALIAS("rfc4543");