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