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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/gcm.h>
18#include <crypto/hash.h>
19#include "internal.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_skcipher *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_skcipher *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 skcipher_request skreq;
78 } u;
79};
80
81static struct {
82 u8 buf[16];
83 struct scatterlist sg;
84} *gcm_zeroes;
85
86static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc);
87
88static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
89 struct aead_request *req)
90{
91 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
92
93 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
94}
95
96static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
97 unsigned int keylen)
98{
99 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
100 struct crypto_ahash *ghash = ctx->ghash;
101 struct crypto_skcipher *ctr = ctx->ctr;
102 struct {
103 be128 hash;
104 u8 iv[16];
105
106 struct crypto_wait wait;
107
108 struct scatterlist sg[1];
109 struct skcipher_request req;
110 } *data;
111 int err;
112
113 crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
114 crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
115 CRYPTO_TFM_REQ_MASK);
116 err = crypto_skcipher_setkey(ctr, key, keylen);
117 crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctr) &
118 CRYPTO_TFM_RES_MASK);
119 if (err)
120 return err;
121
122 data = kzalloc(sizeof(*data) + crypto_skcipher_reqsize(ctr),
123 GFP_KERNEL);
124 if (!data)
125 return -ENOMEM;
126
127 crypto_init_wait(&data->wait);
128 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
129 skcipher_request_set_tfm(&data->req, ctr);
130 skcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
131 CRYPTO_TFM_REQ_MAY_BACKLOG,
132 crypto_req_done,
133 &data->wait);
134 skcipher_request_set_crypt(&data->req, data->sg, data->sg,
135 sizeof(data->hash), data->iv);
136
137 err = crypto_wait_req(crypto_skcipher_encrypt(&data->req),
138 &data->wait);
139
140 if (err)
141 goto out;
142
143 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
144 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
145 CRYPTO_TFM_REQ_MASK);
146 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
147 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
148 CRYPTO_TFM_RES_MASK);
149
150out:
151 kzfree(data);
152 return err;
153}
154
155static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
156 unsigned int authsize)
157{
158 switch (authsize) {
159 case 4:
160 case 8:
161 case 12:
162 case 13:
163 case 14:
164 case 15:
165 case 16:
166 break;
167 default:
168 return -EINVAL;
169 }
170
171 return 0;
172}
173
174static void crypto_gcm_init_common(struct aead_request *req)
175{
176 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
177 __be32 counter = cpu_to_be32(1);
178 struct scatterlist *sg;
179
180 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
181 memcpy(pctx->iv, req->iv, GCM_AES_IV_SIZE);
182 memcpy(pctx->iv + GCM_AES_IV_SIZE, &counter, 4);
183
184 sg_init_table(pctx->src, 3);
185 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
186 sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen);
187 if (sg != pctx->src + 1)
188 sg_chain(pctx->src, 2, sg);
189
190 if (req->src != req->dst) {
191 sg_init_table(pctx->dst, 3);
192 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
193 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen);
194 if (sg != pctx->dst + 1)
195 sg_chain(pctx->dst, 2, sg);
196 }
197}
198
199static void crypto_gcm_init_crypt(struct aead_request *req,
200 unsigned int cryptlen)
201{
202 struct crypto_aead *aead = crypto_aead_reqtfm(req);
203 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
204 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
205 struct skcipher_request *skreq = &pctx->u.skreq;
206 struct scatterlist *dst;
207
208 dst = req->src == req->dst ? pctx->src : pctx->dst;
209
210 skcipher_request_set_tfm(skreq, ctx->ctr);
211 skcipher_request_set_crypt(skreq, pctx->src, dst,
212 cryptlen + sizeof(pctx->auth_tag),
213 pctx->iv);
214}
215
216static inline unsigned int gcm_remain(unsigned int len)
217{
218 len &= 0xfU;
219 return len ? 16 - len : 0;
220}
221
222static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
223
224static int gcm_hash_update(struct aead_request *req,
225 crypto_completion_t compl,
226 struct scatterlist *src,
227 unsigned int len, u32 flags)
228{
229 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
230 struct ahash_request *ahreq = &pctx->u.ahreq;
231
232 ahash_request_set_callback(ahreq, flags, compl, req);
233 ahash_request_set_crypt(ahreq, src, NULL, len);
234
235 return crypto_ahash_update(ahreq);
236}
237
238static int gcm_hash_remain(struct aead_request *req,
239 unsigned int remain,
240 crypto_completion_t compl, u32 flags)
241{
242 return gcm_hash_update(req, compl, &gcm_zeroes->sg, remain, flags);
243}
244
245static int gcm_hash_len(struct aead_request *req, u32 flags)
246{
247 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
248 struct ahash_request *ahreq = &pctx->u.ahreq;
249 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
250 u128 lengths;
251
252 lengths.a = cpu_to_be64(req->assoclen * 8);
253 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
254 memcpy(pctx->iauth_tag, &lengths, 16);
255 sg_init_one(&pctx->sg, pctx->iauth_tag, 16);
256 ahash_request_set_callback(ahreq, flags, gcm_hash_len_done, req);
257 ahash_request_set_crypt(ahreq, &pctx->sg,
258 pctx->iauth_tag, sizeof(lengths));
259
260 return crypto_ahash_finup(ahreq);
261}
262
263static int gcm_hash_len_continue(struct aead_request *req, u32 flags)
264{
265 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
266 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
267
268 return gctx->complete(req, flags);
269}
270
271static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
272{
273 struct aead_request *req = areq->data;
274
275 if (err)
276 goto out;
277
278 err = gcm_hash_len_continue(req, 0);
279 if (err == -EINPROGRESS)
280 return;
281
282out:
283 aead_request_complete(req, err);
284}
285
286static int gcm_hash_crypt_remain_continue(struct aead_request *req, u32 flags)
287{
288 return gcm_hash_len(req, flags) ?:
289 gcm_hash_len_continue(req, flags);
290}
291
292static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
293 int err)
294{
295 struct aead_request *req = areq->data;
296
297 if (err)
298 goto out;
299
300 err = gcm_hash_crypt_remain_continue(req, 0);
301 if (err == -EINPROGRESS)
302 return;
303
304out:
305 aead_request_complete(req, err);
306}
307
308static int gcm_hash_crypt_continue(struct aead_request *req, u32 flags)
309{
310 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
311 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
312 unsigned int remain;
313
314 remain = gcm_remain(gctx->cryptlen);
315 if (remain)
316 return gcm_hash_remain(req, remain,
317 gcm_hash_crypt_remain_done, flags) ?:
318 gcm_hash_crypt_remain_continue(req, flags);
319
320 return gcm_hash_crypt_remain_continue(req, flags);
321}
322
323static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
324{
325 struct aead_request *req = areq->data;
326
327 if (err)
328 goto out;
329
330 err = gcm_hash_crypt_continue(req, 0);
331 if (err == -EINPROGRESS)
332 return;
333
334out:
335 aead_request_complete(req, err);
336}
337
338static int gcm_hash_assoc_remain_continue(struct aead_request *req, u32 flags)
339{
340 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
341 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
342
343 if (gctx->cryptlen)
344 return gcm_hash_update(req, gcm_hash_crypt_done,
345 gctx->src, gctx->cryptlen, flags) ?:
346 gcm_hash_crypt_continue(req, flags);
347
348 return gcm_hash_crypt_remain_continue(req, flags);
349}
350
351static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
352 int err)
353{
354 struct aead_request *req = areq->data;
355
356 if (err)
357 goto out;
358
359 err = gcm_hash_assoc_remain_continue(req, 0);
360 if (err == -EINPROGRESS)
361 return;
362
363out:
364 aead_request_complete(req, err);
365}
366
367static int gcm_hash_assoc_continue(struct aead_request *req, u32 flags)
368{
369 unsigned int remain;
370
371 remain = gcm_remain(req->assoclen);
372 if (remain)
373 return gcm_hash_remain(req, remain,
374 gcm_hash_assoc_remain_done, flags) ?:
375 gcm_hash_assoc_remain_continue(req, flags);
376
377 return gcm_hash_assoc_remain_continue(req, flags);
378}
379
380static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
381{
382 struct aead_request *req = areq->data;
383
384 if (err)
385 goto out;
386
387 err = gcm_hash_assoc_continue(req, 0);
388 if (err == -EINPROGRESS)
389 return;
390
391out:
392 aead_request_complete(req, err);
393}
394
395static int gcm_hash_init_continue(struct aead_request *req, u32 flags)
396{
397 if (req->assoclen)
398 return gcm_hash_update(req, gcm_hash_assoc_done,
399 req->src, req->assoclen, flags) ?:
400 gcm_hash_assoc_continue(req, flags);
401
402 return gcm_hash_assoc_remain_continue(req, flags);
403}
404
405static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
406{
407 struct aead_request *req = areq->data;
408
409 if (err)
410 goto out;
411
412 err = gcm_hash_init_continue(req, 0);
413 if (err == -EINPROGRESS)
414 return;
415
416out:
417 aead_request_complete(req, err);
418}
419
420static int gcm_hash(struct aead_request *req, u32 flags)
421{
422 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
423 struct ahash_request *ahreq = &pctx->u.ahreq;
424 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
425
426 ahash_request_set_tfm(ahreq, ctx->ghash);
427
428 ahash_request_set_callback(ahreq, flags, gcm_hash_init_done, req);
429 return crypto_ahash_init(ahreq) ?:
430 gcm_hash_init_continue(req, flags);
431}
432
433static int gcm_enc_copy_hash(struct aead_request *req, u32 flags)
434{
435 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
436 struct crypto_aead *aead = crypto_aead_reqtfm(req);
437 u8 *auth_tag = pctx->auth_tag;
438
439 crypto_xor(auth_tag, pctx->iauth_tag, 16);
440 scatterwalk_map_and_copy(auth_tag, req->dst,
441 req->assoclen + req->cryptlen,
442 crypto_aead_authsize(aead), 1);
443 return 0;
444}
445
446static int gcm_encrypt_continue(struct aead_request *req, u32 flags)
447{
448 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
449 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
450
451 gctx->src = sg_next(req->src == req->dst ? pctx->src : pctx->dst);
452 gctx->cryptlen = req->cryptlen;
453 gctx->complete = gcm_enc_copy_hash;
454
455 return gcm_hash(req, flags);
456}
457
458static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
459{
460 struct aead_request *req = areq->data;
461
462 if (err)
463 goto out;
464
465 err = gcm_encrypt_continue(req, 0);
466 if (err == -EINPROGRESS)
467 return;
468
469out:
470 aead_request_complete(req, err);
471}
472
473static int crypto_gcm_encrypt(struct aead_request *req)
474{
475 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
476 struct skcipher_request *skreq = &pctx->u.skreq;
477 u32 flags = aead_request_flags(req);
478
479 crypto_gcm_init_common(req);
480 crypto_gcm_init_crypt(req, req->cryptlen);
481 skcipher_request_set_callback(skreq, flags, gcm_encrypt_done, req);
482
483 return crypto_skcipher_encrypt(skreq) ?:
484 gcm_encrypt_continue(req, flags);
485}
486
487static int crypto_gcm_verify(struct aead_request *req)
488{
489 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
490 struct crypto_aead *aead = crypto_aead_reqtfm(req);
491 u8 *auth_tag = pctx->auth_tag;
492 u8 *iauth_tag = pctx->iauth_tag;
493 unsigned int authsize = crypto_aead_authsize(aead);
494 unsigned int cryptlen = req->cryptlen - authsize;
495
496 crypto_xor(auth_tag, iauth_tag, 16);
497 scatterwalk_map_and_copy(iauth_tag, req->src,
498 req->assoclen + cryptlen, authsize, 0);
499 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
500}
501
502static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
503{
504 struct aead_request *req = areq->data;
505
506 if (!err)
507 err = crypto_gcm_verify(req);
508
509 aead_request_complete(req, err);
510}
511
512static int gcm_dec_hash_continue(struct aead_request *req, u32 flags)
513{
514 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
515 struct skcipher_request *skreq = &pctx->u.skreq;
516 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
517
518 crypto_gcm_init_crypt(req, gctx->cryptlen);
519 skcipher_request_set_callback(skreq, flags, gcm_decrypt_done, req);
520 return crypto_skcipher_decrypt(skreq) ?: crypto_gcm_verify(req);
521}
522
523static int crypto_gcm_decrypt(struct aead_request *req)
524{
525 struct crypto_aead *aead = crypto_aead_reqtfm(req);
526 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
527 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
528 unsigned int authsize = crypto_aead_authsize(aead);
529 unsigned int cryptlen = req->cryptlen;
530 u32 flags = aead_request_flags(req);
531
532 cryptlen -= authsize;
533
534 crypto_gcm_init_common(req);
535
536 gctx->src = sg_next(pctx->src);
537 gctx->cryptlen = cryptlen;
538 gctx->complete = gcm_dec_hash_continue;
539
540 return gcm_hash(req, flags);
541}
542
543static int crypto_gcm_init_tfm(struct crypto_aead *tfm)
544{
545 struct aead_instance *inst = aead_alg_instance(tfm);
546 struct gcm_instance_ctx *ictx = aead_instance_ctx(inst);
547 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
548 struct crypto_skcipher *ctr;
549 struct crypto_ahash *ghash;
550 unsigned long align;
551 int err;
552
553 ghash = crypto_spawn_ahash(&ictx->ghash);
554 if (IS_ERR(ghash))
555 return PTR_ERR(ghash);
556
557 ctr = crypto_spawn_skcipher(&ictx->ctr);
558 err = PTR_ERR(ctr);
559 if (IS_ERR(ctr))
560 goto err_free_hash;
561
562 ctx->ctr = ctr;
563 ctx->ghash = ghash;
564
565 align = crypto_aead_alignmask(tfm);
566 align &= ~(crypto_tfm_ctx_alignment() - 1);
567 crypto_aead_set_reqsize(tfm,
568 align + offsetof(struct crypto_gcm_req_priv_ctx, u) +
569 max(sizeof(struct skcipher_request) +
570 crypto_skcipher_reqsize(ctr),
571 sizeof(struct ahash_request) +
572 crypto_ahash_reqsize(ghash)));
573
574 return 0;
575
576err_free_hash:
577 crypto_free_ahash(ghash);
578 return err;
579}
580
581static void crypto_gcm_exit_tfm(struct crypto_aead *tfm)
582{
583 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(tfm);
584
585 crypto_free_ahash(ctx->ghash);
586 crypto_free_skcipher(ctx->ctr);
587}
588
589static void crypto_gcm_free(struct aead_instance *inst)
590{
591 struct gcm_instance_ctx *ctx = aead_instance_ctx(inst);
592
593 crypto_drop_skcipher(&ctx->ctr);
594 crypto_drop_ahash(&ctx->ghash);
595 kfree(inst);
596}
597
598static int crypto_gcm_create_common(struct crypto_template *tmpl,
599 struct rtattr **tb,
600 const char *full_name,
601 const char *ctr_name,
602 const char *ghash_name)
603{
604 struct crypto_attr_type *algt;
605 struct aead_instance *inst;
606 struct skcipher_alg *ctr;
607 struct crypto_alg *ghash_alg;
608 struct hash_alg_common *ghash;
609 struct gcm_instance_ctx *ctx;
610 int err;
611
612 algt = crypto_get_attr_type(tb);
613 if (IS_ERR(algt))
614 return PTR_ERR(algt);
615
616 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
617 return -EINVAL;
618
619 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
620 CRYPTO_ALG_TYPE_HASH,
621 CRYPTO_ALG_TYPE_AHASH_MASK |
622 crypto_requires_sync(algt->type,
623 algt->mask));
624 if (IS_ERR(ghash_alg))
625 return PTR_ERR(ghash_alg);
626
627 ghash = __crypto_hash_alg_common(ghash_alg);
628
629 err = -ENOMEM;
630 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
631 if (!inst)
632 goto out_put_ghash;
633
634 ctx = aead_instance_ctx(inst);
635 err = crypto_init_ahash_spawn(&ctx->ghash, ghash,
636 aead_crypto_instance(inst));
637 if (err)
638 goto err_free_inst;
639
640 err = -EINVAL;
641 if (ghash->digestsize != 16)
642 goto err_drop_ghash;
643
644 crypto_set_skcipher_spawn(&ctx->ctr, aead_crypto_instance(inst));
645 err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
646 crypto_requires_sync(algt->type,
647 algt->mask));
648 if (err)
649 goto err_drop_ghash;
650
651 ctr = crypto_spawn_skcipher_alg(&ctx->ctr);
652
653 /* We only support 16-byte blocks. */
654 err = -EINVAL;
655 if (crypto_skcipher_alg_ivsize(ctr) != 16)
656 goto out_put_ctr;
657
658 /* Not a stream cipher? */
659 if (ctr->base.cra_blocksize != 1)
660 goto out_put_ctr;
661
662 err = -ENAMETOOLONG;
663 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
664 "gcm_base(%s,%s)", ctr->base.cra_driver_name,
665 ghash_alg->cra_driver_name) >=
666 CRYPTO_MAX_ALG_NAME)
667 goto out_put_ctr;
668
669 memcpy(inst->alg.base.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
670
671 inst->alg.base.cra_flags = (ghash->base.cra_flags |
672 ctr->base.cra_flags) & CRYPTO_ALG_ASYNC;
673 inst->alg.base.cra_priority = (ghash->base.cra_priority +
674 ctr->base.cra_priority) / 2;
675 inst->alg.base.cra_blocksize = 1;
676 inst->alg.base.cra_alignmask = ghash->base.cra_alignmask |
677 ctr->base.cra_alignmask;
678 inst->alg.base.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
679 inst->alg.ivsize = GCM_AES_IV_SIZE;
680 inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr);
681 inst->alg.maxauthsize = 16;
682 inst->alg.init = crypto_gcm_init_tfm;
683 inst->alg.exit = crypto_gcm_exit_tfm;
684 inst->alg.setkey = crypto_gcm_setkey;
685 inst->alg.setauthsize = crypto_gcm_setauthsize;
686 inst->alg.encrypt = crypto_gcm_encrypt;
687 inst->alg.decrypt = crypto_gcm_decrypt;
688
689 inst->free = crypto_gcm_free;
690
691 err = aead_register_instance(tmpl, inst);
692 if (err)
693 goto out_put_ctr;
694
695out_put_ghash:
696 crypto_mod_put(ghash_alg);
697 return err;
698
699out_put_ctr:
700 crypto_drop_skcipher(&ctx->ctr);
701err_drop_ghash:
702 crypto_drop_ahash(&ctx->ghash);
703err_free_inst:
704 kfree(inst);
705 goto out_put_ghash;
706}
707
708static int crypto_gcm_create(struct crypto_template *tmpl, struct rtattr **tb)
709{
710 const char *cipher_name;
711 char ctr_name[CRYPTO_MAX_ALG_NAME];
712 char full_name[CRYPTO_MAX_ALG_NAME];
713
714 cipher_name = crypto_attr_alg_name(tb[1]);
715 if (IS_ERR(cipher_name))
716 return PTR_ERR(cipher_name);
717
718 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
719 CRYPTO_MAX_ALG_NAME)
720 return -ENAMETOOLONG;
721
722 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
723 CRYPTO_MAX_ALG_NAME)
724 return -ENAMETOOLONG;
725
726 return crypto_gcm_create_common(tmpl, tb, full_name,
727 ctr_name, "ghash");
728}
729
730static struct crypto_template crypto_gcm_tmpl = {
731 .name = "gcm",
732 .create = crypto_gcm_create,
733 .module = THIS_MODULE,
734};
735
736static int crypto_gcm_base_create(struct crypto_template *tmpl,
737 struct rtattr **tb)
738{
739 const char *ctr_name;
740 const char *ghash_name;
741 char full_name[CRYPTO_MAX_ALG_NAME];
742
743 ctr_name = crypto_attr_alg_name(tb[1]);
744 if (IS_ERR(ctr_name))
745 return PTR_ERR(ctr_name);
746
747 ghash_name = crypto_attr_alg_name(tb[2]);
748 if (IS_ERR(ghash_name))
749 return PTR_ERR(ghash_name);
750
751 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
752 ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
753 return -ENAMETOOLONG;
754
755 return crypto_gcm_create_common(tmpl, tb, full_name,
756 ctr_name, ghash_name);
757}
758
759static struct crypto_template crypto_gcm_base_tmpl = {
760 .name = "gcm_base",
761 .create = crypto_gcm_base_create,
762 .module = THIS_MODULE,
763};
764
765static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
766 unsigned int keylen)
767{
768 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
769 struct crypto_aead *child = ctx->child;
770 int err;
771
772 if (keylen < 4)
773 return -EINVAL;
774
775 keylen -= 4;
776 memcpy(ctx->nonce, key + keylen, 4);
777
778 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
779 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
780 CRYPTO_TFM_REQ_MASK);
781 err = crypto_aead_setkey(child, key, keylen);
782 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
783 CRYPTO_TFM_RES_MASK);
784
785 return err;
786}
787
788static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
789 unsigned int authsize)
790{
791 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
792
793 switch (authsize) {
794 case 8:
795 case 12:
796 case 16:
797 break;
798 default:
799 return -EINVAL;
800 }
801
802 return crypto_aead_setauthsize(ctx->child, authsize);
803}
804
805static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
806{
807 struct crypto_rfc4106_req_ctx *rctx = aead_request_ctx(req);
808 struct crypto_aead *aead = crypto_aead_reqtfm(req);
809 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
810 struct aead_request *subreq = &rctx->subreq;
811 struct crypto_aead *child = ctx->child;
812 struct scatterlist *sg;
813 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
814 crypto_aead_alignmask(child) + 1);
815
816 scatterwalk_map_and_copy(iv + GCM_AES_IV_SIZE, req->src, 0, req->assoclen - 8, 0);
817
818 memcpy(iv, ctx->nonce, 4);
819 memcpy(iv + 4, req->iv, 8);
820
821 sg_init_table(rctx->src, 3);
822 sg_set_buf(rctx->src, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
823 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen);
824 if (sg != rctx->src + 1)
825 sg_chain(rctx->src, 2, sg);
826
827 if (req->src != req->dst) {
828 sg_init_table(rctx->dst, 3);
829 sg_set_buf(rctx->dst, iv + GCM_AES_IV_SIZE, req->assoclen - 8);
830 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen);
831 if (sg != rctx->dst + 1)
832 sg_chain(rctx->dst, 2, sg);
833 }
834
835 aead_request_set_tfm(subreq, child);
836 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
837 req->base.data);
838 aead_request_set_crypt(subreq, rctx->src,
839 req->src == req->dst ? rctx->src : rctx->dst,
840 req->cryptlen, iv);
841 aead_request_set_ad(subreq, req->assoclen - 8);
842
843 return subreq;
844}
845
846static int crypto_rfc4106_encrypt(struct aead_request *req)
847{
848 if (req->assoclen != 16 && req->assoclen != 20)
849 return -EINVAL;
850
851 req = crypto_rfc4106_crypt(req);
852
853 return crypto_aead_encrypt(req);
854}
855
856static int crypto_rfc4106_decrypt(struct aead_request *req)
857{
858 if (req->assoclen != 16 && req->assoclen != 20)
859 return -EINVAL;
860
861 req = crypto_rfc4106_crypt(req);
862
863 return crypto_aead_decrypt(req);
864}
865
866static int crypto_rfc4106_init_tfm(struct crypto_aead *tfm)
867{
868 struct aead_instance *inst = aead_alg_instance(tfm);
869 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst);
870 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
871 struct crypto_aead *aead;
872 unsigned long align;
873
874 aead = crypto_spawn_aead(spawn);
875 if (IS_ERR(aead))
876 return PTR_ERR(aead);
877
878 ctx->child = aead;
879
880 align = crypto_aead_alignmask(aead);
881 align &= ~(crypto_tfm_ctx_alignment() - 1);
882 crypto_aead_set_reqsize(
883 tfm,
884 sizeof(struct crypto_rfc4106_req_ctx) +
885 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
886 align + 24);
887
888 return 0;
889}
890
891static void crypto_rfc4106_exit_tfm(struct crypto_aead *tfm)
892{
893 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(tfm);
894
895 crypto_free_aead(ctx->child);
896}
897
898static void crypto_rfc4106_free(struct aead_instance *inst)
899{
900 crypto_drop_aead(aead_instance_ctx(inst));
901 kfree(inst);
902}
903
904static int crypto_rfc4106_create(struct crypto_template *tmpl,
905 struct rtattr **tb)
906{
907 struct crypto_attr_type *algt;
908 struct aead_instance *inst;
909 struct crypto_aead_spawn *spawn;
910 struct aead_alg *alg;
911 const char *ccm_name;
912 int err;
913
914 algt = crypto_get_attr_type(tb);
915 if (IS_ERR(algt))
916 return PTR_ERR(algt);
917
918 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
919 return -EINVAL;
920
921 ccm_name = crypto_attr_alg_name(tb[1]);
922 if (IS_ERR(ccm_name))
923 return PTR_ERR(ccm_name);
924
925 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
926 if (!inst)
927 return -ENOMEM;
928
929 spawn = aead_instance_ctx(inst);
930 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
931 err = crypto_grab_aead(spawn, ccm_name, 0,
932 crypto_requires_sync(algt->type, algt->mask));
933 if (err)
934 goto out_free_inst;
935
936 alg = crypto_spawn_aead_alg(spawn);
937
938 err = -EINVAL;
939
940 /* Underlying IV size must be 12. */
941 if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
942 goto out_drop_alg;
943
944 /* Not a stream cipher? */
945 if (alg->base.cra_blocksize != 1)
946 goto out_drop_alg;
947
948 err = -ENAMETOOLONG;
949 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
950 "rfc4106(%s)", alg->base.cra_name) >=
951 CRYPTO_MAX_ALG_NAME ||
952 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
953 "rfc4106(%s)", alg->base.cra_driver_name) >=
954 CRYPTO_MAX_ALG_NAME)
955 goto out_drop_alg;
956
957 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
958 inst->alg.base.cra_priority = alg->base.cra_priority;
959 inst->alg.base.cra_blocksize = 1;
960 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
961
962 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
963
964 inst->alg.ivsize = GCM_RFC4106_IV_SIZE;
965 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
966 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
967
968 inst->alg.init = crypto_rfc4106_init_tfm;
969 inst->alg.exit = crypto_rfc4106_exit_tfm;
970
971 inst->alg.setkey = crypto_rfc4106_setkey;
972 inst->alg.setauthsize = crypto_rfc4106_setauthsize;
973 inst->alg.encrypt = crypto_rfc4106_encrypt;
974 inst->alg.decrypt = crypto_rfc4106_decrypt;
975
976 inst->free = crypto_rfc4106_free;
977
978 err = aead_register_instance(tmpl, inst);
979 if (err)
980 goto out_drop_alg;
981
982out:
983 return err;
984
985out_drop_alg:
986 crypto_drop_aead(spawn);
987out_free_inst:
988 kfree(inst);
989 goto out;
990}
991
992static struct crypto_template crypto_rfc4106_tmpl = {
993 .name = "rfc4106",
994 .create = crypto_rfc4106_create,
995 .module = THIS_MODULE,
996};
997
998static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
999 unsigned int keylen)
1000{
1001 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1002 struct crypto_aead *child = ctx->child;
1003 int err;
1004
1005 if (keylen < 4)
1006 return -EINVAL;
1007
1008 keylen -= 4;
1009 memcpy(ctx->nonce, key + keylen, 4);
1010
1011 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1012 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1013 CRYPTO_TFM_REQ_MASK);
1014 err = crypto_aead_setkey(child, key, keylen);
1015 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1016 CRYPTO_TFM_RES_MASK);
1017
1018 return err;
1019}
1020
1021static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1022 unsigned int authsize)
1023{
1024 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1025
1026 if (authsize != 16)
1027 return -EINVAL;
1028
1029 return crypto_aead_setauthsize(ctx->child, authsize);
1030}
1031
1032static int crypto_rfc4543_crypt(struct aead_request *req, bool enc)
1033{
1034 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1035 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1036 struct crypto_rfc4543_req_ctx *rctx = aead_request_ctx(req);
1037 struct aead_request *subreq = &rctx->subreq;
1038 unsigned int authsize = crypto_aead_authsize(aead);
1039 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1040 crypto_aead_alignmask(ctx->child) + 1);
1041 int err;
1042
1043 if (req->src != req->dst) {
1044 err = crypto_rfc4543_copy_src_to_dst(req, enc);
1045 if (err)
1046 return err;
1047 }
1048
1049 memcpy(iv, ctx->nonce, 4);
1050 memcpy(iv + 4, req->iv, 8);
1051
1052 aead_request_set_tfm(subreq, ctx->child);
1053 aead_request_set_callback(subreq, req->base.flags,
1054 req->base.complete, req->base.data);
1055 aead_request_set_crypt(subreq, req->src, req->dst,
1056 enc ? 0 : authsize, iv);
1057 aead_request_set_ad(subreq, req->assoclen + req->cryptlen -
1058 subreq->cryptlen);
1059
1060 return enc ? crypto_aead_encrypt(subreq) : crypto_aead_decrypt(subreq);
1061}
1062
1063static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1064{
1065 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1066 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1067 unsigned int authsize = crypto_aead_authsize(aead);
1068 unsigned int nbytes = req->assoclen + req->cryptlen -
1069 (enc ? 0 : authsize);
1070 SKCIPHER_REQUEST_ON_STACK(nreq, ctx->null);
1071
1072 skcipher_request_set_tfm(nreq, ctx->null);
1073 skcipher_request_set_callback(nreq, req->base.flags, NULL, NULL);
1074 skcipher_request_set_crypt(nreq, req->src, req->dst, nbytes, NULL);
1075
1076 return crypto_skcipher_encrypt(nreq);
1077}
1078
1079static int crypto_rfc4543_encrypt(struct aead_request *req)
1080{
1081 return crypto_rfc4543_crypt(req, true);
1082}
1083
1084static int crypto_rfc4543_decrypt(struct aead_request *req)
1085{
1086 return crypto_rfc4543_crypt(req, false);
1087}
1088
1089static int crypto_rfc4543_init_tfm(struct crypto_aead *tfm)
1090{
1091 struct aead_instance *inst = aead_alg_instance(tfm);
1092 struct crypto_rfc4543_instance_ctx *ictx = aead_instance_ctx(inst);
1093 struct crypto_aead_spawn *spawn = &ictx->aead;
1094 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1095 struct crypto_aead *aead;
1096 struct crypto_skcipher *null;
1097 unsigned long align;
1098 int err = 0;
1099
1100 aead = crypto_spawn_aead(spawn);
1101 if (IS_ERR(aead))
1102 return PTR_ERR(aead);
1103
1104 null = crypto_get_default_null_skcipher();
1105 err = PTR_ERR(null);
1106 if (IS_ERR(null))
1107 goto err_free_aead;
1108
1109 ctx->child = aead;
1110 ctx->null = null;
1111
1112 align = crypto_aead_alignmask(aead);
1113 align &= ~(crypto_tfm_ctx_alignment() - 1);
1114 crypto_aead_set_reqsize(
1115 tfm,
1116 sizeof(struct crypto_rfc4543_req_ctx) +
1117 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) +
1118 align + GCM_AES_IV_SIZE);
1119
1120 return 0;
1121
1122err_free_aead:
1123 crypto_free_aead(aead);
1124 return err;
1125}
1126
1127static void crypto_rfc4543_exit_tfm(struct crypto_aead *tfm)
1128{
1129 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(tfm);
1130
1131 crypto_free_aead(ctx->child);
1132 crypto_put_default_null_skcipher();
1133}
1134
1135static void crypto_rfc4543_free(struct aead_instance *inst)
1136{
1137 struct crypto_rfc4543_instance_ctx *ctx = aead_instance_ctx(inst);
1138
1139 crypto_drop_aead(&ctx->aead);
1140
1141 kfree(inst);
1142}
1143
1144static int crypto_rfc4543_create(struct crypto_template *tmpl,
1145 struct rtattr **tb)
1146{
1147 struct crypto_attr_type *algt;
1148 struct aead_instance *inst;
1149 struct crypto_aead_spawn *spawn;
1150 struct aead_alg *alg;
1151 struct crypto_rfc4543_instance_ctx *ctx;
1152 const char *ccm_name;
1153 int err;
1154
1155 algt = crypto_get_attr_type(tb);
1156 if (IS_ERR(algt))
1157 return PTR_ERR(algt);
1158
1159 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1160 return -EINVAL;
1161
1162 ccm_name = crypto_attr_alg_name(tb[1]);
1163 if (IS_ERR(ccm_name))
1164 return PTR_ERR(ccm_name);
1165
1166 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1167 if (!inst)
1168 return -ENOMEM;
1169
1170 ctx = aead_instance_ctx(inst);
1171 spawn = &ctx->aead;
1172 crypto_set_aead_spawn(spawn, aead_crypto_instance(inst));
1173 err = crypto_grab_aead(spawn, ccm_name, 0,
1174 crypto_requires_sync(algt->type, algt->mask));
1175 if (err)
1176 goto out_free_inst;
1177
1178 alg = crypto_spawn_aead_alg(spawn);
1179
1180 err = -EINVAL;
1181
1182 /* Underlying IV size must be 12. */
1183 if (crypto_aead_alg_ivsize(alg) != GCM_AES_IV_SIZE)
1184 goto out_drop_alg;
1185
1186 /* Not a stream cipher? */
1187 if (alg->base.cra_blocksize != 1)
1188 goto out_drop_alg;
1189
1190 err = -ENAMETOOLONG;
1191 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
1192 "rfc4543(%s)", alg->base.cra_name) >=
1193 CRYPTO_MAX_ALG_NAME ||
1194 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1195 "rfc4543(%s)", alg->base.cra_driver_name) >=
1196 CRYPTO_MAX_ALG_NAME)
1197 goto out_drop_alg;
1198
1199 inst->alg.base.cra_flags = alg->base.cra_flags & CRYPTO_ALG_ASYNC;
1200 inst->alg.base.cra_priority = alg->base.cra_priority;
1201 inst->alg.base.cra_blocksize = 1;
1202 inst->alg.base.cra_alignmask = alg->base.cra_alignmask;
1203
1204 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1205
1206 inst->alg.ivsize = GCM_RFC4543_IV_SIZE;
1207 inst->alg.chunksize = crypto_aead_alg_chunksize(alg);
1208 inst->alg.maxauthsize = crypto_aead_alg_maxauthsize(alg);
1209
1210 inst->alg.init = crypto_rfc4543_init_tfm;
1211 inst->alg.exit = crypto_rfc4543_exit_tfm;
1212
1213 inst->alg.setkey = crypto_rfc4543_setkey;
1214 inst->alg.setauthsize = crypto_rfc4543_setauthsize;
1215 inst->alg.encrypt = crypto_rfc4543_encrypt;
1216 inst->alg.decrypt = crypto_rfc4543_decrypt;
1217
1218 inst->free = crypto_rfc4543_free,
1219
1220 err = aead_register_instance(tmpl, inst);
1221 if (err)
1222 goto out_drop_alg;
1223
1224out:
1225 return err;
1226
1227out_drop_alg:
1228 crypto_drop_aead(spawn);
1229out_free_inst:
1230 kfree(inst);
1231 goto out;
1232}
1233
1234static struct crypto_template crypto_rfc4543_tmpl = {
1235 .name = "rfc4543",
1236 .create = crypto_rfc4543_create,
1237 .module = THIS_MODULE,
1238};
1239
1240static int __init crypto_gcm_module_init(void)
1241{
1242 int err;
1243
1244 gcm_zeroes = kzalloc(sizeof(*gcm_zeroes), GFP_KERNEL);
1245 if (!gcm_zeroes)
1246 return -ENOMEM;
1247
1248 sg_init_one(&gcm_zeroes->sg, gcm_zeroes->buf, sizeof(gcm_zeroes->buf));
1249
1250 err = crypto_register_template(&crypto_gcm_base_tmpl);
1251 if (err)
1252 goto out;
1253
1254 err = crypto_register_template(&crypto_gcm_tmpl);
1255 if (err)
1256 goto out_undo_base;
1257
1258 err = crypto_register_template(&crypto_rfc4106_tmpl);
1259 if (err)
1260 goto out_undo_gcm;
1261
1262 err = crypto_register_template(&crypto_rfc4543_tmpl);
1263 if (err)
1264 goto out_undo_rfc4106;
1265
1266 return 0;
1267
1268out_undo_rfc4106:
1269 crypto_unregister_template(&crypto_rfc4106_tmpl);
1270out_undo_gcm:
1271 crypto_unregister_template(&crypto_gcm_tmpl);
1272out_undo_base:
1273 crypto_unregister_template(&crypto_gcm_base_tmpl);
1274out:
1275 kfree(gcm_zeroes);
1276 return err;
1277}
1278
1279static void __exit crypto_gcm_module_exit(void)
1280{
1281 kfree(gcm_zeroes);
1282 crypto_unregister_template(&crypto_rfc4543_tmpl);
1283 crypto_unregister_template(&crypto_rfc4106_tmpl);
1284 crypto_unregister_template(&crypto_gcm_tmpl);
1285 crypto_unregister_template(&crypto_gcm_base_tmpl);
1286}
1287
1288module_init(crypto_gcm_module_init);
1289module_exit(crypto_gcm_module_exit);
1290
1291MODULE_LICENSE("GPL");
1292MODULE_DESCRIPTION("Galois/Counter Mode");
1293MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1294MODULE_ALIAS_CRYPTO("gcm_base");
1295MODULE_ALIAS_CRYPTO("rfc4106");
1296MODULE_ALIAS_CRYPTO("rfc4543");
1297MODULE_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_instance_ctx {
41 struct crypto_aead_spawn aead;
42 struct crypto_skcipher_spawn null;
43};
44
45struct crypto_rfc4543_ctx {
46 struct crypto_aead *child;
47 struct crypto_blkcipher *null;
48 u8 nonce[4];
49};
50
51struct crypto_rfc4543_req_ctx {
52 u8 auth_tag[16];
53 u8 assocbuf[32];
54 struct scatterlist cipher[1];
55 struct scatterlist payload[2];
56 struct scatterlist assoc[2];
57 struct aead_request subreq;
58};
59
60struct crypto_gcm_ghash_ctx {
61 unsigned int cryptlen;
62 struct scatterlist *src;
63 void (*complete)(struct aead_request *req, int err);
64};
65
66struct crypto_gcm_req_priv_ctx {
67 u8 auth_tag[16];
68 u8 iauth_tag[16];
69 struct scatterlist src[2];
70 struct scatterlist dst[2];
71 struct crypto_gcm_ghash_ctx ghash_ctx;
72 union {
73 struct ahash_request ahreq;
74 struct ablkcipher_request abreq;
75 } u;
76};
77
78struct crypto_gcm_setkey_result {
79 int err;
80 struct completion completion;
81};
82
83static void *gcm_zeroes;
84
85static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
86 struct aead_request *req)
87{
88 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
89
90 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
91}
92
93static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
94{
95 struct crypto_gcm_setkey_result *result = req->data;
96
97 if (err == -EINPROGRESS)
98 return;
99
100 result->err = err;
101 complete(&result->completion);
102}
103
104static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
105 unsigned int keylen)
106{
107 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
108 struct crypto_ahash *ghash = ctx->ghash;
109 struct crypto_ablkcipher *ctr = ctx->ctr;
110 struct {
111 be128 hash;
112 u8 iv[8];
113
114 struct crypto_gcm_setkey_result result;
115
116 struct scatterlist sg[1];
117 struct ablkcipher_request req;
118 } *data;
119 int err;
120
121 crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
122 crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
123 CRYPTO_TFM_REQ_MASK);
124
125 err = crypto_ablkcipher_setkey(ctr, key, keylen);
126 if (err)
127 return err;
128
129 crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
130 CRYPTO_TFM_RES_MASK);
131
132 data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
133 GFP_KERNEL);
134 if (!data)
135 return -ENOMEM;
136
137 init_completion(&data->result.completion);
138 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
139 ablkcipher_request_set_tfm(&data->req, ctr);
140 ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
141 CRYPTO_TFM_REQ_MAY_BACKLOG,
142 crypto_gcm_setkey_done,
143 &data->result);
144 ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
145 sizeof(data->hash), data->iv);
146
147 err = crypto_ablkcipher_encrypt(&data->req);
148 if (err == -EINPROGRESS || err == -EBUSY) {
149 err = wait_for_completion_interruptible(
150 &data->result.completion);
151 if (!err)
152 err = data->result.err;
153 }
154
155 if (err)
156 goto out;
157
158 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
159 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
160 CRYPTO_TFM_REQ_MASK);
161 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
162 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
163 CRYPTO_TFM_RES_MASK);
164
165out:
166 kfree(data);
167 return err;
168}
169
170static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
171 unsigned int authsize)
172{
173 switch (authsize) {
174 case 4:
175 case 8:
176 case 12:
177 case 13:
178 case 14:
179 case 15:
180 case 16:
181 break;
182 default:
183 return -EINVAL;
184 }
185
186 return 0;
187}
188
189static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
190 struct aead_request *req,
191 unsigned int cryptlen)
192{
193 struct crypto_aead *aead = crypto_aead_reqtfm(req);
194 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
195 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
196 struct scatterlist *dst;
197 __be32 counter = cpu_to_be32(1);
198
199 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
200 memcpy(req->iv + 12, &counter, 4);
201
202 sg_init_table(pctx->src, 2);
203 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
204 scatterwalk_sg_chain(pctx->src, 2, req->src);
205
206 dst = pctx->src;
207 if (req->src != req->dst) {
208 sg_init_table(pctx->dst, 2);
209 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
210 scatterwalk_sg_chain(pctx->dst, 2, req->dst);
211 dst = pctx->dst;
212 }
213
214 ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
215 ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
216 cryptlen + sizeof(pctx->auth_tag),
217 req->iv);
218}
219
220static inline unsigned int gcm_remain(unsigned int len)
221{
222 len &= 0xfU;
223 return len ? 16 - len : 0;
224}
225
226static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
227static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
228
229static int gcm_hash_update(struct aead_request *req,
230 struct crypto_gcm_req_priv_ctx *pctx,
231 crypto_completion_t complete,
232 struct scatterlist *src,
233 unsigned int len)
234{
235 struct ahash_request *ahreq = &pctx->u.ahreq;
236
237 ahash_request_set_callback(ahreq, aead_request_flags(req),
238 complete, req);
239 ahash_request_set_crypt(ahreq, src, NULL, len);
240
241 return crypto_ahash_update(ahreq);
242}
243
244static int gcm_hash_remain(struct aead_request *req,
245 struct crypto_gcm_req_priv_ctx *pctx,
246 unsigned int remain,
247 crypto_completion_t complete)
248{
249 struct ahash_request *ahreq = &pctx->u.ahreq;
250
251 ahash_request_set_callback(ahreq, aead_request_flags(req),
252 complete, req);
253 sg_init_one(pctx->src, gcm_zeroes, remain);
254 ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
255
256 return crypto_ahash_update(ahreq);
257}
258
259static int gcm_hash_len(struct aead_request *req,
260 struct crypto_gcm_req_priv_ctx *pctx)
261{
262 struct ahash_request *ahreq = &pctx->u.ahreq;
263 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
264 u128 lengths;
265
266 lengths.a = cpu_to_be64(req->assoclen * 8);
267 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
268 memcpy(pctx->iauth_tag, &lengths, 16);
269 sg_init_one(pctx->src, pctx->iauth_tag, 16);
270 ahash_request_set_callback(ahreq, aead_request_flags(req),
271 gcm_hash_len_done, req);
272 ahash_request_set_crypt(ahreq, pctx->src,
273 NULL, sizeof(lengths));
274
275 return crypto_ahash_update(ahreq);
276}
277
278static int gcm_hash_final(struct aead_request *req,
279 struct crypto_gcm_req_priv_ctx *pctx)
280{
281 struct ahash_request *ahreq = &pctx->u.ahreq;
282
283 ahash_request_set_callback(ahreq, aead_request_flags(req),
284 gcm_hash_final_done, req);
285 ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
286
287 return crypto_ahash_final(ahreq);
288}
289
290static void __gcm_hash_final_done(struct aead_request *req, int err)
291{
292 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
293 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
294
295 if (!err)
296 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
297
298 gctx->complete(req, err);
299}
300
301static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
302{
303 struct aead_request *req = areq->data;
304
305 __gcm_hash_final_done(req, err);
306}
307
308static void __gcm_hash_len_done(struct aead_request *req, int err)
309{
310 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
311
312 if (!err) {
313 err = gcm_hash_final(req, pctx);
314 if (err == -EINPROGRESS || err == -EBUSY)
315 return;
316 }
317
318 __gcm_hash_final_done(req, err);
319}
320
321static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
322{
323 struct aead_request *req = areq->data;
324
325 __gcm_hash_len_done(req, err);
326}
327
328static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
329{
330 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
331
332 if (!err) {
333 err = gcm_hash_len(req, pctx);
334 if (err == -EINPROGRESS || err == -EBUSY)
335 return;
336 }
337
338 __gcm_hash_len_done(req, err);
339}
340
341static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
342 int err)
343{
344 struct aead_request *req = areq->data;
345
346 __gcm_hash_crypt_remain_done(req, err);
347}
348
349static void __gcm_hash_crypt_done(struct aead_request *req, int err)
350{
351 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
352 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
353 unsigned int remain;
354
355 if (!err) {
356 remain = gcm_remain(gctx->cryptlen);
357 BUG_ON(!remain);
358 err = gcm_hash_remain(req, pctx, remain,
359 gcm_hash_crypt_remain_done);
360 if (err == -EINPROGRESS || err == -EBUSY)
361 return;
362 }
363
364 __gcm_hash_crypt_remain_done(req, err);
365}
366
367static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
368{
369 struct aead_request *req = areq->data;
370
371 __gcm_hash_crypt_done(req, err);
372}
373
374static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
375{
376 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
377 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
378 crypto_completion_t complete;
379 unsigned int remain = 0;
380
381 if (!err && gctx->cryptlen) {
382 remain = gcm_remain(gctx->cryptlen);
383 complete = remain ? gcm_hash_crypt_done :
384 gcm_hash_crypt_remain_done;
385 err = gcm_hash_update(req, pctx, complete,
386 gctx->src, gctx->cryptlen);
387 if (err == -EINPROGRESS || err == -EBUSY)
388 return;
389 }
390
391 if (remain)
392 __gcm_hash_crypt_done(req, err);
393 else
394 __gcm_hash_crypt_remain_done(req, err);
395}
396
397static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
398 int err)
399{
400 struct aead_request *req = areq->data;
401
402 __gcm_hash_assoc_remain_done(req, err);
403}
404
405static void __gcm_hash_assoc_done(struct aead_request *req, int err)
406{
407 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
408 unsigned int remain;
409
410 if (!err) {
411 remain = gcm_remain(req->assoclen);
412 BUG_ON(!remain);
413 err = gcm_hash_remain(req, pctx, remain,
414 gcm_hash_assoc_remain_done);
415 if (err == -EINPROGRESS || err == -EBUSY)
416 return;
417 }
418
419 __gcm_hash_assoc_remain_done(req, err);
420}
421
422static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
423{
424 struct aead_request *req = areq->data;
425
426 __gcm_hash_assoc_done(req, err);
427}
428
429static void __gcm_hash_init_done(struct aead_request *req, int err)
430{
431 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
432 crypto_completion_t complete;
433 unsigned int remain = 0;
434
435 if (!err && req->assoclen) {
436 remain = gcm_remain(req->assoclen);
437 complete = remain ? gcm_hash_assoc_done :
438 gcm_hash_assoc_remain_done;
439 err = gcm_hash_update(req, pctx, complete,
440 req->assoc, req->assoclen);
441 if (err == -EINPROGRESS || err == -EBUSY)
442 return;
443 }
444
445 if (remain)
446 __gcm_hash_assoc_done(req, err);
447 else
448 __gcm_hash_assoc_remain_done(req, err);
449}
450
451static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
452{
453 struct aead_request *req = areq->data;
454
455 __gcm_hash_init_done(req, err);
456}
457
458static int gcm_hash(struct aead_request *req,
459 struct crypto_gcm_req_priv_ctx *pctx)
460{
461 struct ahash_request *ahreq = &pctx->u.ahreq;
462 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
463 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
464 unsigned int remain;
465 crypto_completion_t complete;
466 int err;
467
468 ahash_request_set_tfm(ahreq, ctx->ghash);
469
470 ahash_request_set_callback(ahreq, aead_request_flags(req),
471 gcm_hash_init_done, req);
472 err = crypto_ahash_init(ahreq);
473 if (err)
474 return err;
475 remain = gcm_remain(req->assoclen);
476 complete = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
477 err = gcm_hash_update(req, pctx, complete, req->assoc, req->assoclen);
478 if (err)
479 return err;
480 if (remain) {
481 err = gcm_hash_remain(req, pctx, remain,
482 gcm_hash_assoc_remain_done);
483 if (err)
484 return err;
485 }
486 remain = gcm_remain(gctx->cryptlen);
487 complete = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
488 err = gcm_hash_update(req, pctx, complete, gctx->src, gctx->cryptlen);
489 if (err)
490 return err;
491 if (remain) {
492 err = gcm_hash_remain(req, pctx, remain,
493 gcm_hash_crypt_remain_done);
494 if (err)
495 return err;
496 }
497 err = gcm_hash_len(req, pctx);
498 if (err)
499 return err;
500 err = gcm_hash_final(req, pctx);
501 if (err)
502 return err;
503
504 return 0;
505}
506
507static void gcm_enc_copy_hash(struct aead_request *req,
508 struct crypto_gcm_req_priv_ctx *pctx)
509{
510 struct crypto_aead *aead = crypto_aead_reqtfm(req);
511 u8 *auth_tag = pctx->auth_tag;
512
513 scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
514 crypto_aead_authsize(aead), 1);
515}
516
517static void gcm_enc_hash_done(struct aead_request *req, int err)
518{
519 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
520
521 if (!err)
522 gcm_enc_copy_hash(req, pctx);
523
524 aead_request_complete(req, err);
525}
526
527static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
528{
529 struct aead_request *req = areq->data;
530 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
531
532 if (!err) {
533 err = gcm_hash(req, pctx);
534 if (err == -EINPROGRESS || err == -EBUSY)
535 return;
536 else if (!err) {
537 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
538 gcm_enc_copy_hash(req, pctx);
539 }
540 }
541
542 aead_request_complete(req, err);
543}
544
545static int crypto_gcm_encrypt(struct aead_request *req)
546{
547 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
548 struct ablkcipher_request *abreq = &pctx->u.abreq;
549 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
550 int err;
551
552 crypto_gcm_init_crypt(abreq, req, req->cryptlen);
553 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
554 gcm_encrypt_done, req);
555
556 gctx->src = req->dst;
557 gctx->cryptlen = req->cryptlen;
558 gctx->complete = gcm_enc_hash_done;
559
560 err = crypto_ablkcipher_encrypt(abreq);
561 if (err)
562 return err;
563
564 err = gcm_hash(req, pctx);
565 if (err)
566 return err;
567
568 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
569 gcm_enc_copy_hash(req, pctx);
570
571 return 0;
572}
573
574static int crypto_gcm_verify(struct aead_request *req,
575 struct crypto_gcm_req_priv_ctx *pctx)
576{
577 struct crypto_aead *aead = crypto_aead_reqtfm(req);
578 u8 *auth_tag = pctx->auth_tag;
579 u8 *iauth_tag = pctx->iauth_tag;
580 unsigned int authsize = crypto_aead_authsize(aead);
581 unsigned int cryptlen = req->cryptlen - authsize;
582
583 crypto_xor(auth_tag, iauth_tag, 16);
584 scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
585 return crypto_memneq(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
586}
587
588static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
589{
590 struct aead_request *req = areq->data;
591 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
592
593 if (!err)
594 err = crypto_gcm_verify(req, pctx);
595
596 aead_request_complete(req, err);
597}
598
599static void gcm_dec_hash_done(struct aead_request *req, int err)
600{
601 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
602 struct ablkcipher_request *abreq = &pctx->u.abreq;
603 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
604
605 if (!err) {
606 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
607 gcm_decrypt_done, req);
608 crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
609 err = crypto_ablkcipher_decrypt(abreq);
610 if (err == -EINPROGRESS || err == -EBUSY)
611 return;
612 else if (!err)
613 err = crypto_gcm_verify(req, pctx);
614 }
615
616 aead_request_complete(req, err);
617}
618
619static int crypto_gcm_decrypt(struct aead_request *req)
620{
621 struct crypto_aead *aead = crypto_aead_reqtfm(req);
622 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
623 struct ablkcipher_request *abreq = &pctx->u.abreq;
624 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
625 unsigned int authsize = crypto_aead_authsize(aead);
626 unsigned int cryptlen = req->cryptlen;
627 int err;
628
629 if (cryptlen < authsize)
630 return -EINVAL;
631 cryptlen -= authsize;
632
633 gctx->src = req->src;
634 gctx->cryptlen = cryptlen;
635 gctx->complete = gcm_dec_hash_done;
636
637 err = gcm_hash(req, pctx);
638 if (err)
639 return err;
640
641 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
642 gcm_decrypt_done, req);
643 crypto_gcm_init_crypt(abreq, req, cryptlen);
644 err = crypto_ablkcipher_decrypt(abreq);
645 if (err)
646 return err;
647
648 return crypto_gcm_verify(req, pctx);
649}
650
651static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
652{
653 struct crypto_instance *inst = (void *)tfm->__crt_alg;
654 struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
655 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
656 struct crypto_ablkcipher *ctr;
657 struct crypto_ahash *ghash;
658 unsigned long align;
659 int err;
660
661 ghash = crypto_spawn_ahash(&ictx->ghash);
662 if (IS_ERR(ghash))
663 return PTR_ERR(ghash);
664
665 ctr = crypto_spawn_skcipher(&ictx->ctr);
666 err = PTR_ERR(ctr);
667 if (IS_ERR(ctr))
668 goto err_free_hash;
669
670 ctx->ctr = ctr;
671 ctx->ghash = ghash;
672
673 align = crypto_tfm_alg_alignmask(tfm);
674 align &= ~(crypto_tfm_ctx_alignment() - 1);
675 tfm->crt_aead.reqsize = align +
676 offsetof(struct crypto_gcm_req_priv_ctx, u) +
677 max(sizeof(struct ablkcipher_request) +
678 crypto_ablkcipher_reqsize(ctr),
679 sizeof(struct ahash_request) +
680 crypto_ahash_reqsize(ghash));
681
682 return 0;
683
684err_free_hash:
685 crypto_free_ahash(ghash);
686 return err;
687}
688
689static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
690{
691 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
692
693 crypto_free_ahash(ctx->ghash);
694 crypto_free_ablkcipher(ctx->ctr);
695}
696
697static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
698 const char *full_name,
699 const char *ctr_name,
700 const char *ghash_name)
701{
702 struct crypto_attr_type *algt;
703 struct crypto_instance *inst;
704 struct crypto_alg *ctr;
705 struct crypto_alg *ghash_alg;
706 struct ahash_alg *ghash_ahash_alg;
707 struct gcm_instance_ctx *ctx;
708 int err;
709
710 algt = crypto_get_attr_type(tb);
711 if (IS_ERR(algt))
712 return ERR_CAST(algt);
713
714 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
715 return ERR_PTR(-EINVAL);
716
717 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
718 CRYPTO_ALG_TYPE_HASH,
719 CRYPTO_ALG_TYPE_AHASH_MASK);
720 if (IS_ERR(ghash_alg))
721 return ERR_CAST(ghash_alg);
722
723 err = -ENOMEM;
724 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
725 if (!inst)
726 goto out_put_ghash;
727
728 ctx = crypto_instance_ctx(inst);
729 ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
730 err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
731 inst);
732 if (err)
733 goto err_free_inst;
734
735 crypto_set_skcipher_spawn(&ctx->ctr, inst);
736 err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
737 crypto_requires_sync(algt->type,
738 algt->mask));
739 if (err)
740 goto err_drop_ghash;
741
742 ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
743
744 /* We only support 16-byte blocks. */
745 if (ctr->cra_ablkcipher.ivsize != 16)
746 goto out_put_ctr;
747
748 /* Not a stream cipher? */
749 err = -EINVAL;
750 if (ctr->cra_blocksize != 1)
751 goto out_put_ctr;
752
753 err = -ENAMETOOLONG;
754 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
755 "gcm_base(%s,%s)", ctr->cra_driver_name,
756 ghash_alg->cra_driver_name) >=
757 CRYPTO_MAX_ALG_NAME)
758 goto out_put_ctr;
759
760 memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
761
762 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
763 inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
764 inst->alg.cra_priority = ctr->cra_priority;
765 inst->alg.cra_blocksize = 1;
766 inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
767 inst->alg.cra_type = &crypto_aead_type;
768 inst->alg.cra_aead.ivsize = 16;
769 inst->alg.cra_aead.maxauthsize = 16;
770 inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
771 inst->alg.cra_init = crypto_gcm_init_tfm;
772 inst->alg.cra_exit = crypto_gcm_exit_tfm;
773 inst->alg.cra_aead.setkey = crypto_gcm_setkey;
774 inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
775 inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
776 inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
777
778out:
779 crypto_mod_put(ghash_alg);
780 return inst;
781
782out_put_ctr:
783 crypto_drop_skcipher(&ctx->ctr);
784err_drop_ghash:
785 crypto_drop_ahash(&ctx->ghash);
786err_free_inst:
787 kfree(inst);
788out_put_ghash:
789 inst = ERR_PTR(err);
790 goto out;
791}
792
793static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
794{
795 const char *cipher_name;
796 char ctr_name[CRYPTO_MAX_ALG_NAME];
797 char full_name[CRYPTO_MAX_ALG_NAME];
798
799 cipher_name = crypto_attr_alg_name(tb[1]);
800 if (IS_ERR(cipher_name))
801 return ERR_CAST(cipher_name);
802
803 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
804 CRYPTO_MAX_ALG_NAME)
805 return ERR_PTR(-ENAMETOOLONG);
806
807 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
808 CRYPTO_MAX_ALG_NAME)
809 return ERR_PTR(-ENAMETOOLONG);
810
811 return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash");
812}
813
814static void crypto_gcm_free(struct crypto_instance *inst)
815{
816 struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
817
818 crypto_drop_skcipher(&ctx->ctr);
819 crypto_drop_ahash(&ctx->ghash);
820 kfree(inst);
821}
822
823static struct crypto_template crypto_gcm_tmpl = {
824 .name = "gcm",
825 .alloc = crypto_gcm_alloc,
826 .free = crypto_gcm_free,
827 .module = THIS_MODULE,
828};
829
830static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
831{
832 const char *ctr_name;
833 const char *ghash_name;
834 char full_name[CRYPTO_MAX_ALG_NAME];
835
836 ctr_name = crypto_attr_alg_name(tb[1]);
837 if (IS_ERR(ctr_name))
838 return ERR_CAST(ctr_name);
839
840 ghash_name = crypto_attr_alg_name(tb[2]);
841 if (IS_ERR(ghash_name))
842 return ERR_CAST(ghash_name);
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 if (IS_ERR(algt))
975 return ERR_CAST(algt);
976
977 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
978 return ERR_PTR(-EINVAL);
979
980 ccm_name = crypto_attr_alg_name(tb[1]);
981 if (IS_ERR(ccm_name))
982 return ERR_CAST(ccm_name);
983
984 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
985 if (!inst)
986 return ERR_PTR(-ENOMEM);
987
988 spawn = crypto_instance_ctx(inst);
989 crypto_set_aead_spawn(spawn, inst);
990 err = crypto_grab_aead(spawn, ccm_name, 0,
991 crypto_requires_sync(algt->type, algt->mask));
992 if (err)
993 goto out_free_inst;
994
995 alg = crypto_aead_spawn_alg(spawn);
996
997 err = -EINVAL;
998
999 /* We only support 16-byte blocks. */
1000 if (alg->cra_aead.ivsize != 16)
1001 goto out_drop_alg;
1002
1003 /* Not a stream cipher? */
1004 if (alg->cra_blocksize != 1)
1005 goto out_drop_alg;
1006
1007 err = -ENAMETOOLONG;
1008 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1009 "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1010 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1011 "rfc4106(%s)", alg->cra_driver_name) >=
1012 CRYPTO_MAX_ALG_NAME)
1013 goto out_drop_alg;
1014
1015 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1016 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1017 inst->alg.cra_priority = alg->cra_priority;
1018 inst->alg.cra_blocksize = 1;
1019 inst->alg.cra_alignmask = alg->cra_alignmask;
1020 inst->alg.cra_type = &crypto_nivaead_type;
1021
1022 inst->alg.cra_aead.ivsize = 8;
1023 inst->alg.cra_aead.maxauthsize = 16;
1024
1025 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
1026
1027 inst->alg.cra_init = crypto_rfc4106_init_tfm;
1028 inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
1029
1030 inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
1031 inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
1032 inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
1033 inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
1034
1035 inst->alg.cra_aead.geniv = "seqiv";
1036
1037out:
1038 return inst;
1039
1040out_drop_alg:
1041 crypto_drop_aead(spawn);
1042out_free_inst:
1043 kfree(inst);
1044 inst = ERR_PTR(err);
1045 goto out;
1046}
1047
1048static void crypto_rfc4106_free(struct crypto_instance *inst)
1049{
1050 crypto_drop_spawn(crypto_instance_ctx(inst));
1051 kfree(inst);
1052}
1053
1054static struct crypto_template crypto_rfc4106_tmpl = {
1055 .name = "rfc4106",
1056 .alloc = crypto_rfc4106_alloc,
1057 .free = crypto_rfc4106_free,
1058 .module = THIS_MODULE,
1059};
1060
1061static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_reqctx(
1062 struct aead_request *req)
1063{
1064 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
1065
1066 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
1067}
1068
1069static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1070 unsigned int keylen)
1071{
1072 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1073 struct crypto_aead *child = ctx->child;
1074 int err;
1075
1076 if (keylen < 4)
1077 return -EINVAL;
1078
1079 keylen -= 4;
1080 memcpy(ctx->nonce, key + keylen, 4);
1081
1082 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1083 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1084 CRYPTO_TFM_REQ_MASK);
1085 err = crypto_aead_setkey(child, key, keylen);
1086 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1087 CRYPTO_TFM_RES_MASK);
1088
1089 return err;
1090}
1091
1092static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1093 unsigned int authsize)
1094{
1095 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1096
1097 if (authsize != 16)
1098 return -EINVAL;
1099
1100 return crypto_aead_setauthsize(ctx->child, authsize);
1101}
1102
1103static void crypto_rfc4543_done(struct crypto_async_request *areq, int err)
1104{
1105 struct aead_request *req = areq->data;
1106 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1107 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1108
1109 if (!err) {
1110 scatterwalk_map_and_copy(rctx->auth_tag, req->dst,
1111 req->cryptlen,
1112 crypto_aead_authsize(aead), 1);
1113 }
1114
1115 aead_request_complete(req, err);
1116}
1117
1118static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
1119 bool enc)
1120{
1121 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1122 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1123 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1124 struct aead_request *subreq = &rctx->subreq;
1125 struct scatterlist *src = req->src;
1126 struct scatterlist *cipher = rctx->cipher;
1127 struct scatterlist *payload = rctx->payload;
1128 struct scatterlist *assoc = rctx->assoc;
1129 unsigned int authsize = crypto_aead_authsize(aead);
1130 unsigned int assoclen = req->assoclen;
1131 struct page *srcp;
1132 u8 *vsrc;
1133 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1134 crypto_aead_alignmask(ctx->child) + 1);
1135
1136 memcpy(iv, ctx->nonce, 4);
1137 memcpy(iv + 4, req->iv, 8);
1138
1139 /* construct cipher/plaintext */
1140 if (enc)
1141 memset(rctx->auth_tag, 0, authsize);
1142 else
1143 scatterwalk_map_and_copy(rctx->auth_tag, src,
1144 req->cryptlen - authsize,
1145 authsize, 0);
1146
1147 sg_init_one(cipher, rctx->auth_tag, authsize);
1148
1149 /* construct the aad */
1150 srcp = sg_page(src);
1151 vsrc = PageHighMem(srcp) ? NULL : page_address(srcp) + src->offset;
1152
1153 sg_init_table(payload, 2);
1154 sg_set_buf(payload, req->iv, 8);
1155 scatterwalk_crypto_chain(payload, src, vsrc == req->iv + 8, 2);
1156 assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
1157
1158 if (req->assoc->length == req->assoclen) {
1159 sg_init_table(assoc, 2);
1160 sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
1161 req->assoc->offset);
1162 } else {
1163 BUG_ON(req->assoclen > sizeof(rctx->assocbuf));
1164
1165 scatterwalk_map_and_copy(rctx->assocbuf, req->assoc, 0,
1166 req->assoclen, 0);
1167
1168 sg_init_table(assoc, 2);
1169 sg_set_buf(assoc, rctx->assocbuf, req->assoclen);
1170 }
1171 scatterwalk_crypto_chain(assoc, payload, 0, 2);
1172
1173 aead_request_set_tfm(subreq, ctx->child);
1174 aead_request_set_callback(subreq, req->base.flags, crypto_rfc4543_done,
1175 req);
1176 aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
1177 aead_request_set_assoc(subreq, assoc, assoclen);
1178
1179 return subreq;
1180}
1181
1182static int crypto_rfc4543_copy_src_to_dst(struct aead_request *req, bool enc)
1183{
1184 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1185 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1186 unsigned int authsize = crypto_aead_authsize(aead);
1187 unsigned int nbytes = req->cryptlen - (enc ? 0 : authsize);
1188 struct blkcipher_desc desc = {
1189 .tfm = ctx->null,
1190 };
1191
1192 return crypto_blkcipher_encrypt(&desc, req->dst, req->src, nbytes);
1193}
1194
1195static int crypto_rfc4543_encrypt(struct aead_request *req)
1196{
1197 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1198 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1199 struct aead_request *subreq;
1200 int err;
1201
1202 if (req->src != req->dst) {
1203 err = crypto_rfc4543_copy_src_to_dst(req, true);
1204 if (err)
1205 return err;
1206 }
1207
1208 subreq = crypto_rfc4543_crypt(req, true);
1209 err = crypto_aead_encrypt(subreq);
1210 if (err)
1211 return err;
1212
1213 scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
1214 crypto_aead_authsize(aead), 1);
1215
1216 return 0;
1217}
1218
1219static int crypto_rfc4543_decrypt(struct aead_request *req)
1220{
1221 int err;
1222
1223 if (req->src != req->dst) {
1224 err = crypto_rfc4543_copy_src_to_dst(req, false);
1225 if (err)
1226 return err;
1227 }
1228
1229 req = crypto_rfc4543_crypt(req, false);
1230
1231 return crypto_aead_decrypt(req);
1232}
1233
1234static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
1235{
1236 struct crypto_instance *inst = (void *)tfm->__crt_alg;
1237 struct crypto_rfc4543_instance_ctx *ictx = crypto_instance_ctx(inst);
1238 struct crypto_aead_spawn *spawn = &ictx->aead;
1239 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1240 struct crypto_aead *aead;
1241 struct crypto_blkcipher *null;
1242 unsigned long align;
1243 int err = 0;
1244
1245 aead = crypto_spawn_aead(spawn);
1246 if (IS_ERR(aead))
1247 return PTR_ERR(aead);
1248
1249 null = crypto_spawn_blkcipher(&ictx->null.base);
1250 err = PTR_ERR(null);
1251 if (IS_ERR(null))
1252 goto err_free_aead;
1253
1254 ctx->child = aead;
1255 ctx->null = null;
1256
1257 align = crypto_aead_alignmask(aead);
1258 align &= ~(crypto_tfm_ctx_alignment() - 1);
1259 tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
1260 ALIGN(crypto_aead_reqsize(aead),
1261 crypto_tfm_ctx_alignment()) +
1262 align + 16;
1263
1264 return 0;
1265
1266err_free_aead:
1267 crypto_free_aead(aead);
1268 return err;
1269}
1270
1271static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
1272{
1273 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1274
1275 crypto_free_aead(ctx->child);
1276 crypto_free_blkcipher(ctx->null);
1277}
1278
1279static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
1280{
1281 struct crypto_attr_type *algt;
1282 struct crypto_instance *inst;
1283 struct crypto_aead_spawn *spawn;
1284 struct crypto_alg *alg;
1285 struct crypto_rfc4543_instance_ctx *ctx;
1286 const char *ccm_name;
1287 int err;
1288
1289 algt = crypto_get_attr_type(tb);
1290 if (IS_ERR(algt))
1291 return ERR_CAST(algt);
1292
1293 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1294 return ERR_PTR(-EINVAL);
1295
1296 ccm_name = crypto_attr_alg_name(tb[1]);
1297 if (IS_ERR(ccm_name))
1298 return ERR_CAST(ccm_name);
1299
1300 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
1301 if (!inst)
1302 return ERR_PTR(-ENOMEM);
1303
1304 ctx = crypto_instance_ctx(inst);
1305 spawn = &ctx->aead;
1306 crypto_set_aead_spawn(spawn, inst);
1307 err = crypto_grab_aead(spawn, ccm_name, 0,
1308 crypto_requires_sync(algt->type, algt->mask));
1309 if (err)
1310 goto out_free_inst;
1311
1312 alg = crypto_aead_spawn_alg(spawn);
1313
1314 crypto_set_skcipher_spawn(&ctx->null, inst);
1315 err = crypto_grab_skcipher(&ctx->null, "ecb(cipher_null)", 0,
1316 CRYPTO_ALG_ASYNC);
1317 if (err)
1318 goto out_drop_alg;
1319
1320 crypto_skcipher_spawn_alg(&ctx->null);
1321
1322 err = -EINVAL;
1323
1324 /* We only support 16-byte blocks. */
1325 if (alg->cra_aead.ivsize != 16)
1326 goto out_drop_ecbnull;
1327
1328 /* Not a stream cipher? */
1329 if (alg->cra_blocksize != 1)
1330 goto out_drop_ecbnull;
1331
1332 err = -ENAMETOOLONG;
1333 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1334 "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1335 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1336 "rfc4543(%s)", alg->cra_driver_name) >=
1337 CRYPTO_MAX_ALG_NAME)
1338 goto out_drop_ecbnull;
1339
1340 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1341 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1342 inst->alg.cra_priority = alg->cra_priority;
1343 inst->alg.cra_blocksize = 1;
1344 inst->alg.cra_alignmask = alg->cra_alignmask;
1345 inst->alg.cra_type = &crypto_nivaead_type;
1346
1347 inst->alg.cra_aead.ivsize = 8;
1348 inst->alg.cra_aead.maxauthsize = 16;
1349
1350 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1351
1352 inst->alg.cra_init = crypto_rfc4543_init_tfm;
1353 inst->alg.cra_exit = crypto_rfc4543_exit_tfm;
1354
1355 inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
1356 inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
1357 inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
1358 inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt;
1359
1360 inst->alg.cra_aead.geniv = "seqiv";
1361
1362out:
1363 return inst;
1364
1365out_drop_ecbnull:
1366 crypto_drop_skcipher(&ctx->null);
1367out_drop_alg:
1368 crypto_drop_aead(spawn);
1369out_free_inst:
1370 kfree(inst);
1371 inst = ERR_PTR(err);
1372 goto out;
1373}
1374
1375static void crypto_rfc4543_free(struct crypto_instance *inst)
1376{
1377 struct crypto_rfc4543_instance_ctx *ctx = crypto_instance_ctx(inst);
1378
1379 crypto_drop_aead(&ctx->aead);
1380 crypto_drop_skcipher(&ctx->null);
1381
1382 kfree(inst);
1383}
1384
1385static struct crypto_template crypto_rfc4543_tmpl = {
1386 .name = "rfc4543",
1387 .alloc = crypto_rfc4543_alloc,
1388 .free = crypto_rfc4543_free,
1389 .module = THIS_MODULE,
1390};
1391
1392static int __init crypto_gcm_module_init(void)
1393{
1394 int err;
1395
1396 gcm_zeroes = kzalloc(16, GFP_KERNEL);
1397 if (!gcm_zeroes)
1398 return -ENOMEM;
1399
1400 err = crypto_register_template(&crypto_gcm_base_tmpl);
1401 if (err)
1402 goto out;
1403
1404 err = crypto_register_template(&crypto_gcm_tmpl);
1405 if (err)
1406 goto out_undo_base;
1407
1408 err = crypto_register_template(&crypto_rfc4106_tmpl);
1409 if (err)
1410 goto out_undo_gcm;
1411
1412 err = crypto_register_template(&crypto_rfc4543_tmpl);
1413 if (err)
1414 goto out_undo_rfc4106;
1415
1416 return 0;
1417
1418out_undo_rfc4106:
1419 crypto_unregister_template(&crypto_rfc4106_tmpl);
1420out_undo_gcm:
1421 crypto_unregister_template(&crypto_gcm_tmpl);
1422out_undo_base:
1423 crypto_unregister_template(&crypto_gcm_base_tmpl);
1424out:
1425 kfree(gcm_zeroes);
1426 return err;
1427}
1428
1429static void __exit crypto_gcm_module_exit(void)
1430{
1431 kfree(gcm_zeroes);
1432 crypto_unregister_template(&crypto_rfc4543_tmpl);
1433 crypto_unregister_template(&crypto_rfc4106_tmpl);
1434 crypto_unregister_template(&crypto_gcm_tmpl);
1435 crypto_unregister_template(&crypto_gcm_base_tmpl);
1436}
1437
1438module_init(crypto_gcm_module_init);
1439module_exit(crypto_gcm_module_exit);
1440
1441MODULE_LICENSE("GPL");
1442MODULE_DESCRIPTION("Galois/Counter Mode");
1443MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
1444MODULE_ALIAS("gcm_base");
1445MODULE_ALIAS("rfc4106");
1446MODULE_ALIAS("rfc4543");