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