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crypto: scatterwalk - Add scatterwalk_crypto_chain helper
[mirror_ubuntu-bionic-kernel.git] / crypto / gcm.c
CommitLineData
28db8e3e
MH		 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
28db8e3e 11#include <crypto/gf128mul.h>
dadbc53d 12#include <crypto/internal/aead.h>
1472e5eb 13#include <crypto/internal/skcipher.h>
9382d97a 14#include <crypto/internal/hash.h>
42c271c6 15#include <crypto/scatterwalk.h>
9382d97a
HY		 16#include <crypto/hash.h>
17#include "internal.h"
84c91152 18#include <linux/completion.h>
28db8e3e
MH		 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
28db8e3e 25struct gcm_instance_ctx {
1472e5eb 26 struct crypto_skcipher_spawn ctr;
9382d97a 27 struct crypto_ahash_spawn ghash;
28db8e3e
MH		 28};
29
30struct crypto_gcm_ctx {
31 struct crypto_ablkcipher *ctr;
9382d97a 32 struct crypto_ahash *ghash;
28db8e3e
MH		 33};
34
dadbc53d
HX		 35struct crypto_rfc4106_ctx {
36 struct crypto_aead *child;
37 u8 nonce[4];
38};
39
73c89c15
TB		 40struct crypto_rfc4543_ctx {
41 struct crypto_aead *child;
42 u8 nonce[4];
43};
44
45struct crypto_rfc4543_req_ctx {
46 u8 auth_tag[16];
47 struct scatterlist cipher[1];
48 struct scatterlist payload[2];
49 struct scatterlist assoc[2];
50 struct aead_request subreq;
51};
52
28db8e3e 53struct crypto_gcm_ghash_ctx {
9382d97a
HY		 54 unsigned int cryptlen;
55 struct scatterlist *src;
62c5593a 56 void (*complete)(struct aead_request *req, int err);
28db8e3e
MH		 57};
58
59struct crypto_gcm_req_priv_ctx {
60 u8 auth_tag[16];
6160b289 61 u8 iauth_tag[16];
84c91152
HX		 62 struct scatterlist src[2];
63 struct scatterlist dst[2];
9382d97a
HY		 64 struct crypto_gcm_ghash_ctx ghash_ctx;
65 union {
66 struct ahash_request ahreq;
67 struct ablkcipher_request abreq;
68 } u;
28db8e3e
MH		 69};
70
84c91152
HX		 71struct crypto_gcm_setkey_result {
72 int err;
73 struct completion completion;
74};
75
9382d97a
HY		 76static void *gcm_zeroes;
77
2589469d
HX		 78static inline struct crypto_gcm_req_priv_ctx *crypto_gcm_reqctx(
79 struct aead_request *req)
80{
81 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
82
83 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
84}
85
84c91152 86static void crypto_gcm_setkey_done(struct crypto_async_request *req, int err)
28db8e3e 87{
84c91152 88 struct crypto_gcm_setkey_result *result = req->data;
28db8e3e 89
84c91152
HX		 90 if (err == -EINPROGRESS)
91 return;
92
93 result->err = err;
94 complete(&result->completion);
28db8e3e
MH		 95}
96
97static int crypto_gcm_setkey(struct crypto_aead *aead, const u8 *key,
98 unsigned int keylen)
99{
100 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
9382d97a 101 struct crypto_ahash *ghash = ctx->ghash;
28db8e3e 102 struct crypto_ablkcipher *ctr = ctx->ctr;
84c91152
HX		 103 struct {
104 be128 hash;
105 u8 iv[8];
106
107 struct crypto_gcm_setkey_result result;
108
109 struct scatterlist sg[1];
110 struct ablkcipher_request req;
111 } *data;
112 int err;
28db8e3e
MH		 113
114 crypto_ablkcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK);
115 crypto_ablkcipher_set_flags(ctr, crypto_aead_get_flags(aead) &
116 CRYPTO_TFM_REQ_MASK);
117
118 err = crypto_ablkcipher_setkey(ctr, key, keylen);
119 if (err)
84c91152 120 return err;
28db8e3e
MH		 121
122 crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctr) &
123 CRYPTO_TFM_RES_MASK);
124
84c91152
HX		 125 data = kzalloc(sizeof(*data) + crypto_ablkcipher_reqsize(ctr),
126 GFP_KERNEL);
127 if (!data)
128 return -ENOMEM;
129
130 init_completion(&data->result.completion);
131 sg_init_one(data->sg, &data->hash, sizeof(data->hash));
132 ablkcipher_request_set_tfm(&data->req, ctr);
133 ablkcipher_request_set_callback(&data->req, CRYPTO_TFM_REQ_MAY_SLEEP |
134 CRYPTO_TFM_REQ_MAY_BACKLOG,
135 crypto_gcm_setkey_done,
136 &data->result);
137 ablkcipher_request_set_crypt(&data->req, data->sg, data->sg,
138 sizeof(data->hash), data->iv);
139
140 err = crypto_ablkcipher_encrypt(&data->req);
141 if (err == -EINPROGRESS || err == -EBUSY) {
142 err = wait_for_completion_interruptible(
143 &data->result.completion);
144 if (!err)
145 err = data->result.err;
146 }
147
28db8e3e
MH		 148 if (err)
149 goto out;
150
9382d97a
HY		 151 crypto_ahash_clear_flags(ghash, CRYPTO_TFM_REQ_MASK);
152 crypto_ahash_set_flags(ghash, crypto_aead_get_flags(aead) &
153 CRYPTO_TFM_REQ_MASK);
154 err = crypto_ahash_setkey(ghash, (u8 *)&data->hash, sizeof(be128));
155 crypto_aead_set_flags(aead, crypto_ahash_get_flags(ghash) &
156 CRYPTO_TFM_RES_MASK);
28db8e3e 157
84c91152
HX		 158out:
159 kfree(data);
28db8e3e
MH		 160 return err;
161}
162
dadbc53d
HX		 163static int crypto_gcm_setauthsize(struct crypto_aead *tfm,
164 unsigned int authsize)
165{
166 switch (authsize) {
167 case 4:
168 case 8:
169 case 12:
170 case 13:
171 case 14:
172 case 15:
173 case 16:
174 break;
175 default:
176 return -EINVAL;
177 }
178
179 return 0;
180}
181
84c91152
HX		 182static void crypto_gcm_init_crypt(struct ablkcipher_request *ablk_req,
183 struct aead_request *req,
184 unsigned int cryptlen)
28db8e3e
MH		 185{
186 struct crypto_aead *aead = crypto_aead_reqtfm(req);
187 struct crypto_gcm_ctx *ctx = crypto_aead_ctx(aead);
2589469d 188 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
84c91152
HX		 189 struct scatterlist *dst;
190 __be32 counter = cpu_to_be32(1);
191
192 memset(pctx->auth_tag, 0, sizeof(pctx->auth_tag));
193 memcpy(req->iv + 12, &counter, 4);
194
195 sg_init_table(pctx->src, 2);
196 sg_set_buf(pctx->src, pctx->auth_tag, sizeof(pctx->auth_tag));
197 scatterwalk_sg_chain(pctx->src, 2, req->src);
198
199 dst = pctx->src;
200 if (req->src != req->dst) {
201 sg_init_table(pctx->dst, 2);
202 sg_set_buf(pctx->dst, pctx->auth_tag, sizeof(pctx->auth_tag));
203 scatterwalk_sg_chain(pctx->dst, 2, req->dst);
204 dst = pctx->dst;
205 }
28db8e3e
MH		 206
207 ablkcipher_request_set_tfm(ablk_req, ctx->ctr);
84c91152
HX		 208 ablkcipher_request_set_crypt(ablk_req, pctx->src, dst,
209 cryptlen + sizeof(pctx->auth_tag),
210 req->iv);
9382d97a
HY		 211}
212
213static inline unsigned int gcm_remain(unsigned int len)
214{
215 len &= 0xfU;
216 return len ? 16 - len : 0;
217}
218
219static void gcm_hash_len_done(struct crypto_async_request *areq, int err);
220static void gcm_hash_final_done(struct crypto_async_request *areq, int err);
28db8e3e 221
9382d97a
HY		 222static int gcm_hash_update(struct aead_request *req,
223 struct crypto_gcm_req_priv_ctx *pctx,
224 crypto_completion_t complete,
225 struct scatterlist *src,
226 unsigned int len)
227{
228 struct ahash_request *ahreq = &pctx->u.ahreq;
28db8e3e 229
9382d97a
HY		 230 ahash_request_set_callback(ahreq, aead_request_flags(req),
231 complete, req);
232 ahash_request_set_crypt(ahreq, src, NULL, len);
233
234 return crypto_ahash_update(ahreq);
28db8e3e
MH		 235}
236
9382d97a
HY		 237static int gcm_hash_remain(struct aead_request *req,
238 struct crypto_gcm_req_priv_ctx *pctx,
239 unsigned int remain,
240 crypto_completion_t complete)
28db8e3e 241{
9382d97a
HY		 242 struct ahash_request *ahreq = &pctx->u.ahreq;
243
244 ahash_request_set_callback(ahreq, aead_request_flags(req),
245 complete, req);
246 sg_init_one(pctx->src, gcm_zeroes, remain);
247 ahash_request_set_crypt(ahreq, pctx->src, NULL, remain);
248
249 return crypto_ahash_update(ahreq);
250}
251
252static int gcm_hash_len(struct aead_request *req,
253 struct crypto_gcm_req_priv_ctx *pctx)
254{
255 struct ahash_request *ahreq = &pctx->u.ahreq;
256 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
257 u128 lengths;
258
259 lengths.a = cpu_to_be64(req->assoclen * 8);
260 lengths.b = cpu_to_be64(gctx->cryptlen * 8);
261 memcpy(pctx->iauth_tag, &lengths, 16);
262 sg_init_one(pctx->src, pctx->iauth_tag, 16);
263 ahash_request_set_callback(ahreq, aead_request_flags(req),
264 gcm_hash_len_done, req);
265 ahash_request_set_crypt(ahreq, pctx->src,
266 NULL, sizeof(lengths));
267
268 return crypto_ahash_update(ahreq);
269}
270
271static int gcm_hash_final(struct aead_request *req,
272 struct crypto_gcm_req_priv_ctx *pctx)
273{
274 struct ahash_request *ahreq = &pctx->u.ahreq;
275
276 ahash_request_set_callback(ahreq, aead_request_flags(req),
277 gcm_hash_final_done, req);
278 ahash_request_set_crypt(ahreq, NULL, pctx->iauth_tag, 0);
279
280 return crypto_ahash_final(ahreq);
281}
282
62c5593a 283static void __gcm_hash_final_done(struct aead_request *req, int err)
9382d97a 284{
2589469d 285 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
9382d97a
HY		 286 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
287
288 if (!err)
289 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
28db8e3e 290
62c5593a 291 gctx->complete(req, err);
9382d97a
HY		 292}
293
62c5593a 294static void gcm_hash_final_done(struct crypto_async_request *areq, int err)
9382d97a
HY		 295{
296 struct aead_request *req = areq->data;
62c5593a
HY		 297
298 __gcm_hash_final_done(req, err);
299}
300
301static void __gcm_hash_len_done(struct aead_request *req, int err)
302{
9382d97a
HY		 303 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
304
305 if (!err) {
306 err = gcm_hash_final(req, pctx);
307 if (err == -EINPROGRESS || err == -EBUSY)
308 return;
309 }
310
62c5593a 311 __gcm_hash_final_done(req, err);
9382d97a
HY		 312}
313
62c5593a 314static void gcm_hash_len_done(struct crypto_async_request *areq, int err)
9382d97a
HY		 315{
316 struct aead_request *req = areq->data;
62c5593a
HY		 317
318 __gcm_hash_len_done(req, err);
319}
320
321static void __gcm_hash_crypt_remain_done(struct aead_request *req, int err)
322{
9382d97a
HY		 323 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
324
325 if (!err) {
326 err = gcm_hash_len(req, pctx);
327 if (err == -EINPROGRESS || err == -EBUSY)
328 return;
329 }
330
62c5593a 331 __gcm_hash_len_done(req, err);
9382d97a
HY		 332}
333
62c5593a
HY		 334static void gcm_hash_crypt_remain_done(struct crypto_async_request *areq,
335 int err)
9382d97a
HY		 336{
337 struct aead_request *req = areq->data;
62c5593a
HY		 338
339 __gcm_hash_crypt_remain_done(req, err);
340}
341
342static void __gcm_hash_crypt_done(struct aead_request *req, int err)
343{
9382d97a
HY		 344 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
345 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
346 unsigned int remain;
347
348 if (!err) {
349 remain = gcm_remain(gctx->cryptlen);
350 BUG_ON(!remain);
351 err = gcm_hash_remain(req, pctx, remain,
352 gcm_hash_crypt_remain_done);
353 if (err == -EINPROGRESS || err == -EBUSY)
354 return;
355 }
356
62c5593a 357 __gcm_hash_crypt_remain_done(req, err);
9382d97a
HY		 358}
359
62c5593a 360static void gcm_hash_crypt_done(struct crypto_async_request *areq, int err)
9382d97a
HY		 361{
362 struct aead_request *req = areq->data;
62c5593a
HY		 363
364 __gcm_hash_crypt_done(req, err);
365}
366
367static void __gcm_hash_assoc_remain_done(struct aead_request *req, int err)
368{
9382d97a
HY		 369 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
370 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
371 crypto_completion_t complete;
372 unsigned int remain = 0;
373
374 if (!err && gctx->cryptlen) {
375 remain = gcm_remain(gctx->cryptlen);
376 complete = remain ? gcm_hash_crypt_done :
377 gcm_hash_crypt_remain_done;
378 err = gcm_hash_update(req, pctx, complete,
379 gctx->src, gctx->cryptlen);
380 if (err == -EINPROGRESS || err == -EBUSY)
381 return;
382 }
383
384 if (remain)
62c5593a 385 __gcm_hash_crypt_done(req, err);
9382d97a 386 else
62c5593a 387 __gcm_hash_crypt_remain_done(req, err);
9382d97a
HY		 388}
389
62c5593a
HY		 390static void gcm_hash_assoc_remain_done(struct crypto_async_request *areq,
391 int err)
9382d97a
HY		 392{
393 struct aead_request *req = areq->data;
62c5593a
HY		 394
395 __gcm_hash_assoc_remain_done(req, err);
396}
397
398static void __gcm_hash_assoc_done(struct aead_request *req, int err)
399{
9382d97a
HY		 400 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
401 unsigned int remain;
402
403 if (!err) {
404 remain = gcm_remain(req->assoclen);
405 BUG_ON(!remain);
406 err = gcm_hash_remain(req, pctx, remain,
407 gcm_hash_assoc_remain_done);
408 if (err == -EINPROGRESS || err == -EBUSY)
409 return;
410 }
411
62c5593a 412 __gcm_hash_assoc_remain_done(req, err);
9382d97a
HY		 413}
414
62c5593a 415static void gcm_hash_assoc_done(struct crypto_async_request *areq, int err)
9382d97a
HY		 416{
417 struct aead_request *req = areq->data;
62c5593a
HY		 418
419 __gcm_hash_assoc_done(req, err);
420}
421
422static void __gcm_hash_init_done(struct aead_request *req, int err)
423{
9382d97a
HY		 424 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
425 crypto_completion_t complete;
426 unsigned int remain = 0;
427
428 if (!err && req->assoclen) {
429 remain = gcm_remain(req->assoclen);
430 complete = remain ? gcm_hash_assoc_done :
431 gcm_hash_assoc_remain_done;
432 err = gcm_hash_update(req, pctx, complete,
433 req->assoc, req->assoclen);
434 if (err == -EINPROGRESS || err == -EBUSY)
435 return;
436 }
437
438 if (remain)
62c5593a 439 __gcm_hash_assoc_done(req, err);
9382d97a 440 else
62c5593a
HY		 441 __gcm_hash_assoc_remain_done(req, err);
442}
443
444static void gcm_hash_init_done(struct crypto_async_request *areq, int err)
445{
446 struct aead_request *req = areq->data;
447
448 __gcm_hash_init_done(req, err);
9382d97a
HY		 449}
450
451static int gcm_hash(struct aead_request *req,
452 struct crypto_gcm_req_priv_ctx *pctx)
453{
454 struct ahash_request *ahreq = &pctx->u.ahreq;
455 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
456 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(req->base.tfm);
457 unsigned int remain;
458 crypto_completion_t complete;
459 int err;
460
461 ahash_request_set_tfm(ahreq, ctx->ghash);
462
463 ahash_request_set_callback(ahreq, aead_request_flags(req),
464 gcm_hash_init_done, req);
465 err = crypto_ahash_init(ahreq);
466 if (err)
467 return err;
468 remain = gcm_remain(req->assoclen);
469 complete = remain ? gcm_hash_assoc_done : gcm_hash_assoc_remain_done;
470 err = gcm_hash_update(req, pctx, complete, req->assoc, req->assoclen);
471 if (err)
472 return err;
473 if (remain) {
474 err = gcm_hash_remain(req, pctx, remain,
475 gcm_hash_assoc_remain_done);
476 if (err)
477 return err;
478 }
479 remain = gcm_remain(gctx->cryptlen);
480 complete = remain ? gcm_hash_crypt_done : gcm_hash_crypt_remain_done;
481 err = gcm_hash_update(req, pctx, complete, gctx->src, gctx->cryptlen);
482 if (err)
483 return err;
484 if (remain) {
485 err = gcm_hash_remain(req, pctx, remain,
486 gcm_hash_crypt_remain_done);
487 if (err)
488 return err;
489 }
490 err = gcm_hash_len(req, pctx);
491 if (err)
492 return err;
493 err = gcm_hash_final(req, pctx);
494 if (err)
495 return err;
496
497 return 0;
498}
499
500static void gcm_enc_copy_hash(struct aead_request *req,
501 struct crypto_gcm_req_priv_ctx *pctx)
502{
503 struct crypto_aead *aead = crypto_aead_reqtfm(req);
504 u8 *auth_tag = pctx->auth_tag;
28db8e3e 505
6160b289
HX		 506 scatterwalk_map_and_copy(auth_tag, req->dst, req->cryptlen,
507 crypto_aead_authsize(aead), 1);
6160b289
HX		 508}
509
62c5593a 510static void gcm_enc_hash_done(struct aead_request *req, int err)
6160b289 511{
9382d97a 512 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
6160b289
HX		 513
514 if (!err)
9382d97a 515 gcm_enc_copy_hash(req, pctx);
6160b289 516
28db8e3e
MH		 517 aead_request_complete(req, err);
518}
519
62c5593a 520static void gcm_encrypt_done(struct crypto_async_request *areq, int err)
9382d97a
HY		 521{
522 struct aead_request *req = areq->data;
523 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
524
525 if (!err) {
526 err = gcm_hash(req, pctx);
527 if (err == -EINPROGRESS || err == -EBUSY)
528 return;
62c5593a
HY		 529 else if (!err) {
530 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
531 gcm_enc_copy_hash(req, pctx);
532 }
9382d97a
HY		 533 }
534
62c5593a 535 aead_request_complete(req, err);
9382d97a
HY		 536}
537
28db8e3e
MH		 538static int crypto_gcm_encrypt(struct aead_request *req)
539{
2589469d 540 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
9382d97a
HY		 541 struct ablkcipher_request *abreq = &pctx->u.abreq;
542 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
84c91152
HX		 543 int err;
544
545 crypto_gcm_init_crypt(abreq, req, req->cryptlen);
546 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
9382d97a
HY		 547 gcm_encrypt_done, req);
548
549 gctx->src = req->dst;
550 gctx->cryptlen = req->cryptlen;
551 gctx->complete = gcm_enc_hash_done;
28db8e3e 552
84c91152 553 err = crypto_ablkcipher_encrypt(abreq);
28db8e3e
MH		 554 if (err)
555 return err;
556
9382d97a
HY		 557 err = gcm_hash(req, pctx);
558 if (err)
559 return err;
560
561 crypto_xor(pctx->auth_tag, pctx->iauth_tag, 16);
562 gcm_enc_copy_hash(req, pctx);
563
564 return 0;
28db8e3e
MH		 565}
566
9382d97a
HY		 567static int crypto_gcm_verify(struct aead_request *req,
568 struct crypto_gcm_req_priv_ctx *pctx)
84c91152
HX		 569{
570 struct crypto_aead *aead = crypto_aead_reqtfm(req);
84c91152
HX		 571 u8 *auth_tag = pctx->auth_tag;
572 u8 *iauth_tag = pctx->iauth_tag;
573 unsigned int authsize = crypto_aead_authsize(aead);
574 unsigned int cryptlen = req->cryptlen - authsize;
575
9382d97a 576 crypto_xor(auth_tag, iauth_tag, 16);
84c91152
HX		 577 scatterwalk_map_and_copy(iauth_tag, req->src, cryptlen, authsize, 0);
578 return memcmp(iauth_tag, auth_tag, authsize) ? -EBADMSG : 0;
579}
580
9382d97a 581static void gcm_decrypt_done(struct crypto_async_request *areq, int err)
28db8e3e 582{
84c91152 583 struct aead_request *req = areq->data;
9382d97a 584 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
84c91152
HX		 585
586 if (!err)
9382d97a 587 err = crypto_gcm_verify(req, pctx);
84c91152
HX		 588
589 aead_request_complete(req, err);
28db8e3e
MH		 590}
591
62c5593a 592static void gcm_dec_hash_done(struct aead_request *req, int err)
9382d97a 593{
9382d97a
HY		 594 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
595 struct ablkcipher_request *abreq = &pctx->u.abreq;
596 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
597
598 if (!err) {
599 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
600 gcm_decrypt_done, req);
601 crypto_gcm_init_crypt(abreq, req, gctx->cryptlen);
602 err = crypto_ablkcipher_decrypt(abreq);
603 if (err == -EINPROGRESS || err == -EBUSY)
604 return;
62c5593a
HY		 605 else if (!err)
606 err = crypto_gcm_verify(req, pctx);
9382d97a
HY		 607 }
608
62c5593a 609 aead_request_complete(req, err);
9382d97a
HY		 610}
611
28db8e3e
MH		 612static int crypto_gcm_decrypt(struct aead_request *req)
613{
6160b289 614 struct crypto_aead *aead = crypto_aead_reqtfm(req);
2589469d 615 struct crypto_gcm_req_priv_ctx *pctx = crypto_gcm_reqctx(req);
9382d97a
HY		 616 struct ablkcipher_request *abreq = &pctx->u.abreq;
617 struct crypto_gcm_ghash_ctx *gctx = &pctx->ghash_ctx;
6160b289 618 unsigned int authsize = crypto_aead_authsize(aead);
9382d97a 619 unsigned int cryptlen = req->cryptlen;
28db8e3e
MH		 620 int err;
621
6160b289 622 if (cryptlen < authsize)
28db8e3e 623 return -EINVAL;
6160b289 624 cryptlen -= authsize;
28db8e3e 625
9382d97a
HY		 626 gctx->src = req->src;
627 gctx->cryptlen = cryptlen;
628 gctx->complete = gcm_dec_hash_done;
28db8e3e 629
9382d97a
HY		 630 err = gcm_hash(req, pctx);
631 if (err)
632 return err;
28db8e3e 633
9382d97a
HY		 634 ablkcipher_request_set_callback(abreq, aead_request_flags(req),
635 gcm_decrypt_done, req);
636 crypto_gcm_init_crypt(abreq, req, cryptlen);
84c91152
HX		 637 err = crypto_ablkcipher_decrypt(abreq);
638 if (err)
639 return err;
28db8e3e 640
9382d97a 641 return crypto_gcm_verify(req, pctx);
28db8e3e
MH		 642}
643
644static int crypto_gcm_init_tfm(struct crypto_tfm *tfm)
645{
646 struct crypto_instance *inst = (void *)tfm->__crt_alg;
647 struct gcm_instance_ctx *ictx = crypto_instance_ctx(inst);
648 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
649 struct crypto_ablkcipher *ctr;
9382d97a 650 struct crypto_ahash *ghash;
28db8e3e
MH		 651 unsigned long align;
652 int err;
653
9382d97a
HY		 654 ghash = crypto_spawn_ahash(&ictx->ghash);
655 if (IS_ERR(ghash))
656 return PTR_ERR(ghash);
657
1472e5eb 658 ctr = crypto_spawn_skcipher(&ictx->ctr);
28db8e3e
MH		 659 err = PTR_ERR(ctr);
660 if (IS_ERR(ctr))
9382d97a 661 goto err_free_hash;
28db8e3e
MH		 662
663 ctx->ctr = ctr;
9382d97a 664 ctx->ghash = ghash;
28db8e3e 665
2589469d 666 align = crypto_tfm_alg_alignmask(tfm);
28db8e3e 667 align &= ~(crypto_tfm_ctx_alignment() - 1);
7f681378 668 tfm->crt_aead.reqsize = align +
9382d97a
HY		 669 offsetof(struct crypto_gcm_req_priv_ctx, u) +
670 max(sizeof(struct ablkcipher_request) +
671 crypto_ablkcipher_reqsize(ctr),
672 sizeof(struct ahash_request) +
673 crypto_ahash_reqsize(ghash));
28db8e3e
MH		 674
675 return 0;
9382d97a
HY		 676
677err_free_hash:
678 crypto_free_ahash(ghash);
679 return err;
28db8e3e
MH		 680}
681
682static void crypto_gcm_exit_tfm(struct crypto_tfm *tfm)
683{
684 struct crypto_gcm_ctx *ctx = crypto_tfm_ctx(tfm);
685
9382d97a 686 crypto_free_ahash(ctx->ghash);
28db8e3e
MH		 687 crypto_free_ablkcipher(ctx->ctr);
688}
689
d00aa19b
HX		 690static struct crypto_instance *crypto_gcm_alloc_common(struct rtattr **tb,
691 const char *full_name,
9382d97a
HY		 692 const char *ctr_name,
693 const char *ghash_name)
28db8e3e 694{
d00aa19b 695 struct crypto_attr_type *algt;
28db8e3e
MH		 696 struct crypto_instance *inst;
697 struct crypto_alg *ctr;
9382d97a
HY		 698 struct crypto_alg *ghash_alg;
699 struct ahash_alg *ghash_ahash_alg;
28db8e3e
MH		 700 struct gcm_instance_ctx *ctx;
701 int err;
28db8e3e 702
d00aa19b
HX		 703 algt = crypto_get_attr_type(tb);
704 err = PTR_ERR(algt);
705 if (IS_ERR(algt))
28db8e3e
MH		 706 return ERR_PTR(err);
707
d00aa19b
HX		 708 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
709 return ERR_PTR(-EINVAL);
28db8e3e 710
9382d97a
HY		 711 ghash_alg = crypto_find_alg(ghash_name, &crypto_ahash_type,
712 CRYPTO_ALG_TYPE_HASH,
713 CRYPTO_ALG_TYPE_AHASH_MASK);
714 err = PTR_ERR(ghash_alg);
715 if (IS_ERR(ghash_alg))
716 return ERR_PTR(err);
717
718 err = -ENOMEM;
1472e5eb
HX		 719 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
720 if (!inst)
9382d97a 721 goto out_put_ghash;
28db8e3e 722
1472e5eb 723 ctx = crypto_instance_ctx(inst);
9382d97a
HY		 724 ghash_ahash_alg = container_of(ghash_alg, struct ahash_alg, halg.base);
725 err = crypto_init_ahash_spawn(&ctx->ghash, &ghash_ahash_alg->halg,
726 inst);
727 if (err)
728 goto err_free_inst;
729
1472e5eb
HX		 730 crypto_set_skcipher_spawn(&ctx->ctr, inst);
731 err = crypto_grab_skcipher(&ctx->ctr, ctr_name, 0,
732 crypto_requires_sync(algt->type,
733 algt->mask));
734 if (err)
9382d97a 735 goto err_drop_ghash;
1472e5eb
HX		 736
737 ctr = crypto_skcipher_spawn_alg(&ctx->ctr);
28db8e3e 738
d00aa19b 739 /* We only support 16-byte blocks. */
1472e5eb 740 if (ctr->cra_ablkcipher.ivsize != 16)
d00aa19b
HX		 741 goto out_put_ctr;
742
743 /* Not a stream cipher? */
744 err = -EINVAL;
745 if (ctr->cra_blocksize != 1)
28db8e3e
MH		 746 goto out_put_ctr;
747
28db8e3e 748 err = -ENAMETOOLONG;
d00aa19b 749 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
9382d97a
HY		 750 "gcm_base(%s,%s)", ctr->cra_driver_name,
751 ghash_alg->cra_driver_name) >=
d00aa19b 752 CRYPTO_MAX_ALG_NAME)
1472e5eb 753 goto out_put_ctr;
28db8e3e 754
d00aa19b
HX		 755 memcpy(inst->alg.cra_name, full_name, CRYPTO_MAX_ALG_NAME);
756
1472e5eb
HX		 757 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
758 inst->alg.cra_flags |= ctr->cra_flags & CRYPTO_ALG_ASYNC;
28db8e3e 759 inst->alg.cra_priority = ctr->cra_priority;
d00aa19b 760 inst->alg.cra_blocksize = 1;
2589469d 761 inst->alg.cra_alignmask = ctr->cra_alignmask | (__alignof__(u64) - 1);
28db8e3e 762 inst->alg.cra_type = &crypto_aead_type;
84c91152 763 inst->alg.cra_aead.ivsize = 16;
7ba683a6 764 inst->alg.cra_aead.maxauthsize = 16;
28db8e3e
MH		 765 inst->alg.cra_ctxsize = sizeof(struct crypto_gcm_ctx);
766 inst->alg.cra_init = crypto_gcm_init_tfm;
767 inst->alg.cra_exit = crypto_gcm_exit_tfm;
768 inst->alg.cra_aead.setkey = crypto_gcm_setkey;
dadbc53d 769 inst->alg.cra_aead.setauthsize = crypto_gcm_setauthsize;
28db8e3e
MH		 770 inst->alg.cra_aead.encrypt = crypto_gcm_encrypt;
771 inst->alg.cra_aead.decrypt = crypto_gcm_decrypt;
772
773out:
9382d97a 774 crypto_mod_put(ghash_alg);
28db8e3e 775 return inst;
1472e5eb
HX		 776
777out_put_ctr:
778 crypto_drop_skcipher(&ctx->ctr);
9382d97a
HY		 779err_drop_ghash:
780 crypto_drop_ahash(&ctx->ghash);
28db8e3e
MH		 781err_free_inst:
782 kfree(inst);
9382d97a 783out_put_ghash:
28db8e3e
MH		 784 inst = ERR_PTR(err);
785 goto out;
786}
787
d00aa19b
HX		 788static struct crypto_instance *crypto_gcm_alloc(struct rtattr **tb)
789{
790 int err;
791 const char *cipher_name;
792 char ctr_name[CRYPTO_MAX_ALG_NAME];
793 char full_name[CRYPTO_MAX_ALG_NAME];
794
795 cipher_name = crypto_attr_alg_name(tb[1]);
796 err = PTR_ERR(cipher_name);
797 if (IS_ERR(cipher_name))
798 return ERR_PTR(err);
799
800 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", cipher_name) >=
801 CRYPTO_MAX_ALG_NAME)
802 return ERR_PTR(-ENAMETOOLONG);
803
804 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm(%s)", cipher_name) >=
805 CRYPTO_MAX_ALG_NAME)
806 return ERR_PTR(-ENAMETOOLONG);
807
9382d97a 808 return crypto_gcm_alloc_common(tb, full_name, ctr_name, "ghash");
d00aa19b
HX		 809}
810
28db8e3e
MH		 811static void crypto_gcm_free(struct crypto_instance *inst)
812{
813 struct gcm_instance_ctx *ctx = crypto_instance_ctx(inst);
814
1472e5eb 815 crypto_drop_skcipher(&ctx->ctr);
9382d97a 816 crypto_drop_ahash(&ctx->ghash);
28db8e3e
MH		 817 kfree(inst);
818}
819
820static struct crypto_template crypto_gcm_tmpl = {
821 .name = "gcm",
822 .alloc = crypto_gcm_alloc,
823 .free = crypto_gcm_free,
824 .module = THIS_MODULE,
825};
826
d00aa19b
HX		 827static struct crypto_instance *crypto_gcm_base_alloc(struct rtattr **tb)
828{
829 int err;
830 const char *ctr_name;
9382d97a 831 const char *ghash_name;
d00aa19b
HX		 832 char full_name[CRYPTO_MAX_ALG_NAME];
833
834 ctr_name = crypto_attr_alg_name(tb[1]);
835 err = PTR_ERR(ctr_name);
836 if (IS_ERR(ctr_name))
837 return ERR_PTR(err);
838
9382d97a
HY		 839 ghash_name = crypto_attr_alg_name(tb[2]);
840 err = PTR_ERR(ghash_name);
841 if (IS_ERR(ghash_name))
842 return ERR_PTR(err);
843
844 if (snprintf(full_name, CRYPTO_MAX_ALG_NAME, "gcm_base(%s,%s)",
845 ctr_name, ghash_name) >= CRYPTO_MAX_ALG_NAME)
d00aa19b
HX		 846 return ERR_PTR(-ENAMETOOLONG);
847
9382d97a 848 return crypto_gcm_alloc_common(tb, full_name, ctr_name, ghash_name);
d00aa19b
HX		 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
dadbc53d
HX		 858static int crypto_rfc4106_setkey(struct crypto_aead *parent, const u8 *key,
859 unsigned int keylen)
860{
861 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
862 struct crypto_aead *child = ctx->child;
863 int err;
864
865 if (keylen < 4)
866 return -EINVAL;
867
868 keylen -= 4;
869 memcpy(ctx->nonce, key + keylen, 4);
870
871 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
872 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
873 CRYPTO_TFM_REQ_MASK);
874 err = crypto_aead_setkey(child, key, keylen);
875 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
876 CRYPTO_TFM_RES_MASK);
877
878 return err;
879}
880
881static int crypto_rfc4106_setauthsize(struct crypto_aead *parent,
882 unsigned int authsize)
883{
884 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(parent);
885
886 switch (authsize) {
887 case 8:
888 case 12:
889 case 16:
890 break;
891 default:
892 return -EINVAL;
893 }
894
895 return crypto_aead_setauthsize(ctx->child, authsize);
896}
897
898static struct aead_request *crypto_rfc4106_crypt(struct aead_request *req)
899{
900 struct aead_request *subreq = aead_request_ctx(req);
901 struct crypto_aead *aead = crypto_aead_reqtfm(req);
902 struct crypto_rfc4106_ctx *ctx = crypto_aead_ctx(aead);
903 struct crypto_aead *child = ctx->child;
904 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child),
905 crypto_aead_alignmask(child) + 1);
906
907 memcpy(iv, ctx->nonce, 4);
908 memcpy(iv + 4, req->iv, 8);
909
910 aead_request_set_tfm(subreq, child);
911 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
912 req->base.data);
913 aead_request_set_crypt(subreq, req->src, req->dst, req->cryptlen, iv);
914 aead_request_set_assoc(subreq, req->assoc, req->assoclen);
915
916 return subreq;
917}
918
919static int crypto_rfc4106_encrypt(struct aead_request *req)
920{
921 req = crypto_rfc4106_crypt(req);
922
923 return crypto_aead_encrypt(req);
924}
925
926static int crypto_rfc4106_decrypt(struct aead_request *req)
927{
928 req = crypto_rfc4106_crypt(req);
929
930 return crypto_aead_decrypt(req);
931}
932
933static int crypto_rfc4106_init_tfm(struct crypto_tfm *tfm)
934{
935 struct crypto_instance *inst = (void *)tfm->__crt_alg;
936 struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
937 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
938 struct crypto_aead *aead;
939 unsigned long align;
940
941 aead = crypto_spawn_aead(spawn);
942 if (IS_ERR(aead))
943 return PTR_ERR(aead);
944
945 ctx->child = aead;
946
947 align = crypto_aead_alignmask(aead);
948 align &= ~(crypto_tfm_ctx_alignment() - 1);
949 tfm->crt_aead.reqsize = sizeof(struct aead_request) +
950 ALIGN(crypto_aead_reqsize(aead),
951 crypto_tfm_ctx_alignment()) +
952 align + 16;
953
954 return 0;
955}
956
957static void crypto_rfc4106_exit_tfm(struct crypto_tfm *tfm)
958{
959 struct crypto_rfc4106_ctx *ctx = crypto_tfm_ctx(tfm);
960
961 crypto_free_aead(ctx->child);
962}
963
964static struct crypto_instance *crypto_rfc4106_alloc(struct rtattr **tb)
965{
966 struct crypto_attr_type *algt;
967 struct crypto_instance *inst;
968 struct crypto_aead_spawn *spawn;
969 struct crypto_alg *alg;
970 const char *ccm_name;
971 int err;
972
973 algt = crypto_get_attr_type(tb);
974 err = PTR_ERR(algt);
975 if (IS_ERR(algt))
976 return ERR_PTR(err);
977
978 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
979 return ERR_PTR(-EINVAL);
980
981 ccm_name = crypto_attr_alg_name(tb[1]);
982 err = PTR_ERR(ccm_name);
983 if (IS_ERR(ccm_name))
984 return ERR_PTR(err);
985
986 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
987 if (!inst)
988 return ERR_PTR(-ENOMEM);
989
990 spawn = crypto_instance_ctx(inst);
991 crypto_set_aead_spawn(spawn, inst);
992 err = crypto_grab_aead(spawn, ccm_name, 0,
993 crypto_requires_sync(algt->type, algt->mask));
994 if (err)
995 goto out_free_inst;
996
997 alg = crypto_aead_spawn_alg(spawn);
998
999 err = -EINVAL;
1000
1001 /* We only support 16-byte blocks. */
1002 if (alg->cra_aead.ivsize != 16)
1003 goto out_drop_alg;
1004
1005 /* Not a stream cipher? */
1006 if (alg->cra_blocksize != 1)
1007 goto out_drop_alg;
1008
1009 err = -ENAMETOOLONG;
1010 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1011 "rfc4106(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1012 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1013 "rfc4106(%s)", alg->cra_driver_name) >=
1014 CRYPTO_MAX_ALG_NAME)
1015 goto out_drop_alg;
1016
1017 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1018 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1019 inst->alg.cra_priority = alg->cra_priority;
1020 inst->alg.cra_blocksize = 1;
1021 inst->alg.cra_alignmask = alg->cra_alignmask;
1022 inst->alg.cra_type = &crypto_nivaead_type;
1023
1024 inst->alg.cra_aead.ivsize = 8;
1025 inst->alg.cra_aead.maxauthsize = 16;
1026
1027 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4106_ctx);
1028
1029 inst->alg.cra_init = crypto_rfc4106_init_tfm;
1030 inst->alg.cra_exit = crypto_rfc4106_exit_tfm;
1031
1032 inst->alg.cra_aead.setkey = crypto_rfc4106_setkey;
1033 inst->alg.cra_aead.setauthsize = crypto_rfc4106_setauthsize;
1034 inst->alg.cra_aead.encrypt = crypto_rfc4106_encrypt;
1035 inst->alg.cra_aead.decrypt = crypto_rfc4106_decrypt;
1036
1037 inst->alg.cra_aead.geniv = "seqiv";
1038
1039out:
1040 return inst;
1041
1042out_drop_alg:
1043 crypto_drop_aead(spawn);
1044out_free_inst:
1045 kfree(inst);
1046 inst = ERR_PTR(err);
1047 goto out;
1048}
1049
1050static void crypto_rfc4106_free(struct crypto_instance *inst)
1051{
1052 crypto_drop_spawn(crypto_instance_ctx(inst));
1053 kfree(inst);
1054}
1055
1056static struct crypto_template crypto_rfc4106_tmpl = {
1057 .name = "rfc4106",
1058 .alloc = crypto_rfc4106_alloc,
1059 .free = crypto_rfc4106_free,
1060 .module = THIS_MODULE,
1061};
1062
73c89c15
TB		 1063static inline struct crypto_rfc4543_req_ctx *crypto_rfc4543_reqctx(
1064 struct aead_request *req)
1065{
1066 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req));
1067
1068 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1);
1069}
1070
1071static int crypto_rfc4543_setkey(struct crypto_aead *parent, const u8 *key,
1072 unsigned int keylen)
1073{
1074 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1075 struct crypto_aead *child = ctx->child;
1076 int err;
1077
1078 if (keylen < 4)
1079 return -EINVAL;
1080
1081 keylen -= 4;
1082 memcpy(ctx->nonce, key + keylen, 4);
1083
1084 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK);
1085 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) &
1086 CRYPTO_TFM_REQ_MASK);
1087 err = crypto_aead_setkey(child, key, keylen);
1088 crypto_aead_set_flags(parent, crypto_aead_get_flags(child) &
1089 CRYPTO_TFM_RES_MASK);
1090
1091 return err;
1092}
1093
1094static int crypto_rfc4543_setauthsize(struct crypto_aead *parent,
1095 unsigned int authsize)
1096{
1097 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(parent);
1098
1099 if (authsize != 16)
1100 return -EINVAL;
1101
1102 return crypto_aead_setauthsize(ctx->child, authsize);
1103}
1104
1105/* this is the same as crypto_authenc_chain */
1106static void crypto_rfc4543_chain(struct scatterlist *head,
1107 struct scatterlist *sg, int chain)
1108{
1109 if (chain) {
1110 head->length += sg->length;
1111 sg = scatterwalk_sg_next(sg);
1112 }
1113
1114 if (sg)
1115 scatterwalk_sg_chain(head, 2, sg);
1116 else
1117 sg_mark_end(head);
1118}
1119
1120static struct aead_request *crypto_rfc4543_crypt(struct aead_request *req,
1121 int enc)
1122{
1123 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1124 struct crypto_rfc4543_ctx *ctx = crypto_aead_ctx(aead);
1125 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1126 struct aead_request *subreq = &rctx->subreq;
1127 struct scatterlist *dst = req->dst;
1128 struct scatterlist *cipher = rctx->cipher;
1129 struct scatterlist *payload = rctx->payload;
1130 struct scatterlist *assoc = rctx->assoc;
1131 unsigned int authsize = crypto_aead_authsize(aead);
1132 unsigned int assoclen = req->assoclen;
1133 struct page *dstp;
1134 u8 *vdst;
1135 u8 *iv = PTR_ALIGN((u8 *)(rctx + 1) + crypto_aead_reqsize(ctx->child),
1136 crypto_aead_alignmask(ctx->child) + 1);
1137
1138 memcpy(iv, ctx->nonce, 4);
1139 memcpy(iv + 4, req->iv, 8);
1140
1141 /* construct cipher/plaintext */
1142 if (enc)
1143 memset(rctx->auth_tag, 0, authsize);
1144 else
1145 scatterwalk_map_and_copy(rctx->auth_tag, dst,
1146 req->cryptlen - authsize,
1147 authsize, 0);
1148
1149 sg_init_one(cipher, rctx->auth_tag, authsize);
1150
1151 /* construct the aad */
1152 dstp = sg_page(dst);
1153 vdst = PageHighMem(dstp) ? NULL : page_address(dstp) + dst->offset;
1154
1155 sg_init_table(payload, 2);
1156 sg_set_buf(payload, req->iv, 8);
1157 crypto_rfc4543_chain(payload, dst, vdst == req->iv + 8);
1158 assoclen += 8 + req->cryptlen - (enc ? 0 : authsize);
1159
1160 sg_init_table(assoc, 2);
1161 sg_set_page(assoc, sg_page(req->assoc), req->assoc->length,
1162 req->assoc->offset);
1163 crypto_rfc4543_chain(assoc, payload, 0);
1164
1165 aead_request_set_tfm(subreq, ctx->child);
1166 aead_request_set_callback(subreq, req->base.flags, req->base.complete,
1167 req->base.data);
1168 aead_request_set_crypt(subreq, cipher, cipher, enc ? 0 : authsize, iv);
1169 aead_request_set_assoc(subreq, assoc, assoclen);
1170
1171 return subreq;
1172}
1173
1174static int crypto_rfc4543_encrypt(struct aead_request *req)
1175{
1176 struct crypto_aead *aead = crypto_aead_reqtfm(req);
1177 struct crypto_rfc4543_req_ctx *rctx = crypto_rfc4543_reqctx(req);
1178 struct aead_request *subreq;
1179 int err;
1180
1181 subreq = crypto_rfc4543_crypt(req, 1);
1182 err = crypto_aead_encrypt(subreq);
1183 if (err)
1184 return err;
1185
1186 scatterwalk_map_and_copy(rctx->auth_tag, req->dst, req->cryptlen,
1187 crypto_aead_authsize(aead), 1);
1188
1189 return 0;
1190}
1191
1192static int crypto_rfc4543_decrypt(struct aead_request *req)
1193{
1194 req = crypto_rfc4543_crypt(req, 0);
1195
1196 return crypto_aead_decrypt(req);
1197}
1198
1199static int crypto_rfc4543_init_tfm(struct crypto_tfm *tfm)
1200{
1201 struct crypto_instance *inst = (void *)tfm->__crt_alg;
1202 struct crypto_aead_spawn *spawn = crypto_instance_ctx(inst);
1203 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1204 struct crypto_aead *aead;
1205 unsigned long align;
1206
1207 aead = crypto_spawn_aead(spawn);
1208 if (IS_ERR(aead))
1209 return PTR_ERR(aead);
1210
1211 ctx->child = aead;
1212
1213 align = crypto_aead_alignmask(aead);
1214 align &= ~(crypto_tfm_ctx_alignment() - 1);
1215 tfm->crt_aead.reqsize = sizeof(struct crypto_rfc4543_req_ctx) +
1216 ALIGN(crypto_aead_reqsize(aead),
1217 crypto_tfm_ctx_alignment()) +
1218 align + 16;
1219
1220 return 0;
1221}
1222
1223static void crypto_rfc4543_exit_tfm(struct crypto_tfm *tfm)
1224{
1225 struct crypto_rfc4543_ctx *ctx = crypto_tfm_ctx(tfm);
1226
1227 crypto_free_aead(ctx->child);
1228}
1229
1230static struct crypto_instance *crypto_rfc4543_alloc(struct rtattr **tb)
1231{
1232 struct crypto_attr_type *algt;
1233 struct crypto_instance *inst;
1234 struct crypto_aead_spawn *spawn;
1235 struct crypto_alg *alg;
1236 const char *ccm_name;
1237 int err;
1238
1239 algt = crypto_get_attr_type(tb);
1240 err = PTR_ERR(algt);
1241 if (IS_ERR(algt))
1242 return ERR_PTR(err);
1243
1244 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask)
1245 return ERR_PTR(-EINVAL);
1246
1247 ccm_name = crypto_attr_alg_name(tb[1]);
1248 err = PTR_ERR(ccm_name);
1249 if (IS_ERR(ccm_name))
1250 return ERR_PTR(err);
1251
1252 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
1253 if (!inst)
1254 return ERR_PTR(-ENOMEM);
1255
1256 spawn = crypto_instance_ctx(inst);
1257 crypto_set_aead_spawn(spawn, inst);
1258 err = crypto_grab_aead(spawn, ccm_name, 0,
1259 crypto_requires_sync(algt->type, algt->mask));
1260 if (err)
1261 goto out_free_inst;
1262
1263 alg = crypto_aead_spawn_alg(spawn);
1264
1265 err = -EINVAL;
1266
1267 /* We only support 16-byte blocks. */
1268 if (alg->cra_aead.ivsize != 16)
1269 goto out_drop_alg;
1270
1271 /* Not a stream cipher? */
1272 if (alg->cra_blocksize != 1)
1273 goto out_drop_alg;
1274
1275 err = -ENAMETOOLONG;
1276 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME,
1277 "rfc4543(%s)", alg->cra_name) >= CRYPTO_MAX_ALG_NAME ||
1278 snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME,
1279 "rfc4543(%s)", alg->cra_driver_name) >=
1280 CRYPTO_MAX_ALG_NAME)
1281 goto out_drop_alg;
1282
1283 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD;
1284 inst->alg.cra_flags |= alg->cra_flags & CRYPTO_ALG_ASYNC;
1285 inst->alg.cra_priority = alg->cra_priority;
1286 inst->alg.cra_blocksize = 1;
1287 inst->alg.cra_alignmask = alg->cra_alignmask;
1288 inst->alg.cra_type = &crypto_nivaead_type;
1289
1290 inst->alg.cra_aead.ivsize = 8;
1291 inst->alg.cra_aead.maxauthsize = 16;
1292
1293 inst->alg.cra_ctxsize = sizeof(struct crypto_rfc4543_ctx);
1294
1295 inst->alg.cra_init = crypto_rfc4543_init_tfm;
1296 inst->alg.cra_exit = crypto_rfc4543_exit_tfm;
1297
1298 inst->alg.cra_aead.setkey = crypto_rfc4543_setkey;
1299 inst->alg.cra_aead.setauthsize = crypto_rfc4543_setauthsize;
1300 inst->alg.cra_aead.encrypt = crypto_rfc4543_encrypt;
1301 inst->alg.cra_aead.decrypt = crypto_rfc4543_decrypt;
1302
1303 inst->alg.cra_aead.geniv = "seqiv";
1304
1305out:
1306 return inst;
1307
1308out_drop_alg:
1309 crypto_drop_aead(spawn);
1310out_free_inst:
1311 kfree(inst);
1312 inst = ERR_PTR(err);
1313 goto out;
1314}
1315
1316static void crypto_rfc4543_free(struct crypto_instance *inst)
1317{
1318 crypto_drop_spawn(crypto_instance_ctx(inst));
1319 kfree(inst);
1320}
1321
1322static struct crypto_template crypto_rfc4543_tmpl = {
1323 .name = "rfc4543",
1324 .alloc = crypto_rfc4543_alloc,
1325 .free = crypto_rfc4543_free,
1326 .module = THIS_MODULE,
1327};
1328
28db8e3e
MH		 1329static int __init crypto_gcm_module_init(void)
1330{
d00aa19b
HX		 1331 int err;
1332
9382d97a
HY		 1333 gcm_zeroes = kzalloc(16, GFP_KERNEL);
1334 if (!gcm_zeroes)
1335 return -ENOMEM;
1336
d00aa19b
HX		 1337 err = crypto_register_template(&crypto_gcm_base_tmpl);
1338 if (err)
1339 goto out;
1340
1341 err = crypto_register_template(&crypto_gcm_tmpl);
1342 if (err)
1343 goto out_undo_base;
1344
dadbc53d
HX		 1345 err = crypto_register_template(&crypto_rfc4106_tmpl);
1346 if (err)
1347 goto out_undo_gcm;
1348
73c89c15
TB		 1349 err = crypto_register_template(&crypto_rfc4543_tmpl);
1350 if (err)
1351 goto out_undo_rfc4106;
1352
9382d97a 1353 return 0;
d00aa19b 1354
73c89c15
TB		 1355out_undo_rfc4106:
1356 crypto_unregister_template(&crypto_rfc4106_tmpl);
dadbc53d
HX		 1357out_undo_gcm:
1358 crypto_unregister_template(&crypto_gcm_tmpl);
d00aa19b
HX		 1359out_undo_base:
1360 crypto_unregister_template(&crypto_gcm_base_tmpl);
9382d97a
HY		 1361out:
1362 kfree(gcm_zeroes);
1363 return err;
28db8e3e
MH		 1364}
1365
1366static void __exit crypto_gcm_module_exit(void)
1367{
9382d97a 1368 kfree(gcm_zeroes);
73c89c15 1369 crypto_unregister_template(&crypto_rfc4543_tmpl);
dadbc53d 1370 crypto_unregister_template(&crypto_rfc4106_tmpl);
28db8e3e 1371 crypto_unregister_template(&crypto_gcm_tmpl);
d00aa19b 1372 crypto_unregister_template(&crypto_gcm_base_tmpl);
28db8e3e
MH		 1373}
1374
1375module_init(crypto_gcm_module_init);
1376module_exit(crypto_gcm_module_exit);
1377
1378MODULE_LICENSE("GPL");
1379MODULE_DESCRIPTION("Galois/Counter Mode");
1380MODULE_AUTHOR("Mikko Herranen <mh1@iki.fi>");
d00aa19b 1381MODULE_ALIAS("gcm_base");
dadbc53d 1382MODULE_ALIAS("rfc4106");
73c89c15 1383MODULE_ALIAS("rfc4543");
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