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crypto: testmgr - Add a longer ChaCha20 test vector
[linux-block.git] / crypto / chacha20poly1305.c
CommitLineData
71ebc4d1
MW		 1/*
2 * ChaCha20-Poly1305 AEAD, RFC7539
3 *
4 * Copyright (C) 2015 Martin Willi
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 */
11
12#include <crypto/internal/aead.h>
13#include <crypto/internal/hash.h>
14#include <crypto/internal/skcipher.h>
15#include <crypto/scatterwalk.h>
31d7247d 16#include <crypto/chacha20.h>
71ebc4d1
MW		 17#include <linux/err.h>
18#include <linux/init.h>
19#include <linux/kernel.h>
20#include <linux/module.h>
21
22#include "internal.h"
23
24#define POLY1305_BLOCK_SIZE 16
25#define POLY1305_DIGEST_SIZE 16
26#define POLY1305_KEY_SIZE 32
71ebc4d1
MW		 27#define CHACHAPOLY_IV_SIZE 12
28
29struct chachapoly_instance_ctx {
30 struct crypto_skcipher_spawn chacha;
31 struct crypto_ahash_spawn poly;
32 unsigned int saltlen;
33};
34
35struct chachapoly_ctx {
36 struct crypto_ablkcipher *chacha;
37 struct crypto_ahash *poly;
38 /* key bytes we use for the ChaCha20 IV */
39 unsigned int saltlen;
40 u8 salt[];
41};
42
43struct poly_req {
44 /* zero byte padding for AD/ciphertext, as needed */
45 u8 pad[POLY1305_BLOCK_SIZE];
46 /* tail data with AD/ciphertext lengths */
47 struct {
48 __le64 assoclen;
49 __le64 cryptlen;
50 } tail;
51 struct scatterlist src[1];
52 struct ahash_request req; /* must be last member */
53};
54
55struct chacha_req {
71ebc4d1
MW		 56 u8 iv[CHACHA20_IV_SIZE];
57 struct scatterlist src[1];
58 struct ablkcipher_request req; /* must be last member */
59};
60
61struct chachapoly_req_ctx {
74790922
HX		 62 struct scatterlist src[2];
63 struct scatterlist dst[2];
c2b7b20a
MW		 64 /* the key we generate for Poly1305 using Chacha20 */
65 u8 key[POLY1305_KEY_SIZE];
71ebc4d1
MW		 66 /* calculated Poly1305 tag */
67 u8 tag[POLY1305_DIGEST_SIZE];
68 /* length of data to en/decrypt, without ICV */
69 unsigned int cryptlen;
74790922
HX		 70 /* Actual AD, excluding IV */
71 unsigned int assoclen;
71ebc4d1
MW		 72 union {
73 struct poly_req poly;
74 struct chacha_req chacha;
75 } u;
76};
77
78static inline void async_done_continue(struct aead_request *req, int err,
79 int (*cont)(struct aead_request *))
80{
81 if (!err)
82 err = cont(req);
83
84 if (err != -EINPROGRESS && err != -EBUSY)
85 aead_request_complete(req, err);
86}
87
88static void chacha_iv(u8 *iv, struct aead_request *req, u32 icb)
89{
90 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
91 __le32 leicb = cpu_to_le32(icb);
92
93 memcpy(iv, &leicb, sizeof(leicb));
94 memcpy(iv + sizeof(leicb), ctx->salt, ctx->saltlen);
95 memcpy(iv + sizeof(leicb) + ctx->saltlen, req->iv,
96 CHACHA20_IV_SIZE - sizeof(leicb) - ctx->saltlen);
97}
98
99static int poly_verify_tag(struct aead_request *req)
100{
101 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
102 u8 tag[sizeof(rctx->tag)];
103
74790922
HX		 104 scatterwalk_map_and_copy(tag, req->src,
105 req->assoclen + rctx->cryptlen,
106 sizeof(tag), 0);
71ebc4d1
MW		 107 if (crypto_memneq(tag, rctx->tag, sizeof(tag)))
108 return -EBADMSG;
109 return 0;
110}
111
112static int poly_copy_tag(struct aead_request *req)
113{
114 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
115
74790922
HX		 116 scatterwalk_map_and_copy(rctx->tag, req->dst,
117 req->assoclen + rctx->cryptlen,
71ebc4d1
MW		 118 sizeof(rctx->tag), 1);
119 return 0;
120}
121
122static void chacha_decrypt_done(struct crypto_async_request *areq, int err)
123{
124 async_done_continue(areq->data, err, poly_verify_tag);
125}
126
127static int chacha_decrypt(struct aead_request *req)
128{
129 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
130 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
131 struct chacha_req *creq = &rctx->u.chacha;
74790922 132 struct scatterlist *src, *dst;
71ebc4d1
MW		 133 int err;
134
135 chacha_iv(creq->iv, req, 1);
136
74790922
HX		 137 sg_init_table(rctx->src, 2);
138 src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen);
139 dst = src;
140
141 if (req->src != req->dst) {
142 sg_init_table(rctx->dst, 2);
143 dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen);
144 }
145
71ebc4d1
MW		 146 ablkcipher_request_set_callback(&creq->req, aead_request_flags(req),
147 chacha_decrypt_done, req);
148 ablkcipher_request_set_tfm(&creq->req, ctx->chacha);
74790922 149 ablkcipher_request_set_crypt(&creq->req, src, dst,
71ebc4d1
MW		 150 rctx->cryptlen, creq->iv);
151 err = crypto_ablkcipher_decrypt(&creq->req);
152 if (err)
153 return err;
154
155 return poly_verify_tag(req);
156}
157
158static int poly_tail_continue(struct aead_request *req)
159{
160 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
161
162 if (rctx->cryptlen == req->cryptlen) /* encrypting */
163 return poly_copy_tag(req);
164
165 return chacha_decrypt(req);
166}
167
168static void poly_tail_done(struct crypto_async_request *areq, int err)
169{
170 async_done_continue(areq->data, err, poly_tail_continue);
171}
172
173static int poly_tail(struct aead_request *req)
174{
74790922
HX		 175 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
176 struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm);
71ebc4d1
MW		 177 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
178 struct poly_req *preq = &rctx->u.poly;
179 __le64 len;
180 int err;
181
182 sg_init_table(preq->src, 1);
74790922 183 len = cpu_to_le64(rctx->assoclen);
71ebc4d1
MW		 184 memcpy(&preq->tail.assoclen, &len, sizeof(len));
185 len = cpu_to_le64(rctx->cryptlen);
186 memcpy(&preq->tail.cryptlen, &len, sizeof(len));
187 sg_set_buf(preq->src, &preq->tail, sizeof(preq->tail));
188
189 ahash_request_set_callback(&preq->req, aead_request_flags(req),
190 poly_tail_done, req);
191 ahash_request_set_tfm(&preq->req, ctx->poly);
192 ahash_request_set_crypt(&preq->req, preq->src,
193 rctx->tag, sizeof(preq->tail));
194
195 err = crypto_ahash_finup(&preq->req);
196 if (err)
197 return err;
198
199 return poly_tail_continue(req);
200}
201
202static void poly_cipherpad_done(struct crypto_async_request *areq, int err)
203{
204 async_done_continue(areq->data, err, poly_tail);
205}
206
207static int poly_cipherpad(struct aead_request *req)
208{
209 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
210 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
211 struct poly_req *preq = &rctx->u.poly;
212 unsigned int padlen, bs = POLY1305_BLOCK_SIZE;
213 int err;
214
215 padlen = (bs - (rctx->cryptlen % bs)) % bs;
216 memset(preq->pad, 0, sizeof(preq->pad));
217 sg_init_table(preq->src, 1);
218 sg_set_buf(preq->src, &preq->pad, padlen);
219
220 ahash_request_set_callback(&preq->req, aead_request_flags(req),
221 poly_cipherpad_done, req);
222 ahash_request_set_tfm(&preq->req, ctx->poly);
223 ahash_request_set_crypt(&preq->req, preq->src, NULL, padlen);
224
225 err = crypto_ahash_update(&preq->req);
226 if (err)
227 return err;
228
229 return poly_tail(req);
230}
231
232static void poly_cipher_done(struct crypto_async_request *areq, int err)
233{
234 async_done_continue(areq->data, err, poly_cipherpad);
235}
236
237static int poly_cipher(struct aead_request *req)
238{
239 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
240 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
241 struct poly_req *preq = &rctx->u.poly;
242 struct scatterlist *crypt = req->src;
243 int err;
244
245 if (rctx->cryptlen == req->cryptlen) /* encrypting */
246 crypt = req->dst;
247
74790922
HX		 248 sg_init_table(rctx->src, 2);
249 crypt = scatterwalk_ffwd(rctx->src, crypt, req->assoclen);
250
71ebc4d1
MW		 251 ahash_request_set_callback(&preq->req, aead_request_flags(req),
252 poly_cipher_done, req);
253 ahash_request_set_tfm(&preq->req, ctx->poly);
254 ahash_request_set_crypt(&preq->req, crypt, NULL, rctx->cryptlen);
255
256 err = crypto_ahash_update(&preq->req);
257 if (err)
258 return err;
259
260 return poly_cipherpad(req);
261}
262
263static void poly_adpad_done(struct crypto_async_request *areq, int err)
264{
265 async_done_continue(areq->data, err, poly_cipher);
266}
267
268static int poly_adpad(struct aead_request *req)
269{
270 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
271 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
272 struct poly_req *preq = &rctx->u.poly;
273 unsigned int padlen, bs = POLY1305_BLOCK_SIZE;
274 int err;
275
74790922 276 padlen = (bs - (rctx->assoclen % bs)) % bs;
71ebc4d1
MW		 277 memset(preq->pad, 0, sizeof(preq->pad));
278 sg_init_table(preq->src, 1);
279 sg_set_buf(preq->src, preq->pad, padlen);
280
281 ahash_request_set_callback(&preq->req, aead_request_flags(req),
282 poly_adpad_done, req);
283 ahash_request_set_tfm(&preq->req, ctx->poly);
284 ahash_request_set_crypt(&preq->req, preq->src, NULL, padlen);
285
286 err = crypto_ahash_update(&preq->req);
287 if (err)
288 return err;
289
290 return poly_cipher(req);
291}
292
293static void poly_ad_done(struct crypto_async_request *areq, int err)
294{
295 async_done_continue(areq->data, err, poly_adpad);
296}
297
298static int poly_ad(struct aead_request *req)
299{
300 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
301 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
302 struct poly_req *preq = &rctx->u.poly;
303 int err;
304
305 ahash_request_set_callback(&preq->req, aead_request_flags(req),
306 poly_ad_done, req);
307 ahash_request_set_tfm(&preq->req, ctx->poly);
74790922 308 ahash_request_set_crypt(&preq->req, req->src, NULL, rctx->assoclen);
71ebc4d1
MW		 309
310 err = crypto_ahash_update(&preq->req);
311 if (err)
312 return err;
313
314 return poly_adpad(req);
315}
316
c2b7b20a 317static void poly_setkey_done(struct crypto_async_request *areq, int err)
71ebc4d1
MW		 318{
319 async_done_continue(areq->data, err, poly_ad);
320}
321
c2b7b20a 322static int poly_setkey(struct aead_request *req)
71ebc4d1
MW		 323{
324 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
325 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
326 struct poly_req *preq = &rctx->u.poly;
327 int err;
328
c2b7b20a
MW		 329 sg_init_table(preq->src, 1);
330 sg_set_buf(preq->src, rctx->key, sizeof(rctx->key));
331
71ebc4d1 332 ahash_request_set_callback(&preq->req, aead_request_flags(req),
c2b7b20a 333 poly_setkey_done, req);
71ebc4d1 334 ahash_request_set_tfm(&preq->req, ctx->poly);
c2b7b20a 335 ahash_request_set_crypt(&preq->req, preq->src, NULL, sizeof(rctx->key));
71ebc4d1 336
c2b7b20a 337 err = crypto_ahash_update(&preq->req);
71ebc4d1
MW		 338 if (err)
339 return err;
340
341 return poly_ad(req);
342}
343
c2b7b20a 344static void poly_init_done(struct crypto_async_request *areq, int err)
71ebc4d1 345{
c2b7b20a
MW		 346 async_done_continue(areq->data, err, poly_setkey);
347}
348
349static int poly_init(struct aead_request *req)
350{
351 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
71ebc4d1 352 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
c2b7b20a 353 struct poly_req *preq = &rctx->u.poly;
71ebc4d1
MW		 354 int err;
355
c2b7b20a
MW		 356 ahash_request_set_callback(&preq->req, aead_request_flags(req),
357 poly_init_done, req);
358 ahash_request_set_tfm(&preq->req, ctx->poly);
71ebc4d1 359
c2b7b20a 360 err = crypto_ahash_init(&preq->req);
71ebc4d1
MW		 361 if (err)
362 return err;
363
c2b7b20a 364 return poly_setkey(req);
71ebc4d1
MW		 365}
366
367static void poly_genkey_done(struct crypto_async_request *areq, int err)
368{
c2b7b20a 369 async_done_continue(areq->data, err, poly_init);
71ebc4d1
MW		 370}
371
372static int poly_genkey(struct aead_request *req)
373{
74790922
HX		 374 struct crypto_aead *tfm = crypto_aead_reqtfm(req);
375 struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm);
71ebc4d1
MW		 376 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
377 struct chacha_req *creq = &rctx->u.chacha;
378 int err;
379
74790922
HX		 380 rctx->assoclen = req->assoclen;
381
382 if (crypto_aead_ivsize(tfm) == 8) {
383 if (rctx->assoclen < 8)
384 return -EINVAL;
385 rctx->assoclen -= 8;
386 }
387
71ebc4d1 388 sg_init_table(creq->src, 1);
c2b7b20a
MW		 389 memset(rctx->key, 0, sizeof(rctx->key));
390 sg_set_buf(creq->src, rctx->key, sizeof(rctx->key));
71ebc4d1
MW		 391
392 chacha_iv(creq->iv, req, 0);
393
394 ablkcipher_request_set_callback(&creq->req, aead_request_flags(req),
395 poly_genkey_done, req);
396 ablkcipher_request_set_tfm(&creq->req, ctx->chacha);
397 ablkcipher_request_set_crypt(&creq->req, creq->src, creq->src,
398 POLY1305_KEY_SIZE, creq->iv);
399
400 err = crypto_ablkcipher_decrypt(&creq->req);
401 if (err)
402 return err;
403
c2b7b20a 404 return poly_init(req);
71ebc4d1
MW		 405}
406
407static void chacha_encrypt_done(struct crypto_async_request *areq, int err)
408{
409 async_done_continue(areq->data, err, poly_genkey);
410}
411
412static int chacha_encrypt(struct aead_request *req)
413{
414 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req));
415 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
416 struct chacha_req *creq = &rctx->u.chacha;
74790922 417 struct scatterlist *src, *dst;
71ebc4d1
MW		 418 int err;
419
420 chacha_iv(creq->iv, req, 1);
421
74790922
HX		 422 sg_init_table(rctx->src, 2);
423 src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen);
424 dst = src;
425
426 if (req->src != req->dst) {
427 sg_init_table(rctx->dst, 2);
428 dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen);
429 }
430
71ebc4d1
MW		 431 ablkcipher_request_set_callback(&creq->req, aead_request_flags(req),
432 chacha_encrypt_done, req);
433 ablkcipher_request_set_tfm(&creq->req, ctx->chacha);
74790922 434 ablkcipher_request_set_crypt(&creq->req, src, dst,
71ebc4d1
MW		 435 req->cryptlen, creq->iv);
436 err = crypto_ablkcipher_encrypt(&creq->req);
437 if (err)
438 return err;
439
440 return poly_genkey(req);
441}
442
443static int chachapoly_encrypt(struct aead_request *req)
444{
445 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
446
447 rctx->cryptlen = req->cryptlen;
448
449 /* encrypt call chain:
450 * - chacha_encrypt/done()
c2b7b20a 451 * - poly_genkey/done()
71ebc4d1 452 * - poly_init/done()
c2b7b20a 453 * - poly_setkey/done()
71ebc4d1
MW		 454 * - poly_ad/done()
455 * - poly_adpad/done()
456 * - poly_cipher/done()
457 * - poly_cipherpad/done()
458 * - poly_tail/done/continue()
459 * - poly_copy_tag()
460 */
461 return chacha_encrypt(req);
462}
463
464static int chachapoly_decrypt(struct aead_request *req)
465{
466 struct chachapoly_req_ctx *rctx = aead_request_ctx(req);
467
71ebc4d1
MW		 468 rctx->cryptlen = req->cryptlen - POLY1305_DIGEST_SIZE;
469
470 /* decrypt call chain:
c2b7b20a 471 * - poly_genkey/done()
71ebc4d1 472 * - poly_init/done()
c2b7b20a 473 * - poly_setkey/done()
71ebc4d1
MW		 474 * - poly_ad/done()
475 * - poly_adpad/done()
476 * - poly_cipher/done()
477 * - poly_cipherpad/done()
478 * - poly_tail/done/continue()
479 * - chacha_decrypt/done()
480 * - poly_verify_tag()
481 */
482 return poly_genkey(req);
483}
484
485static int chachapoly_setkey(struct crypto_aead *aead, const u8 *key,
486 unsigned int keylen)
487{
488 struct chachapoly_ctx *ctx = crypto_aead_ctx(aead);
489 int err;
490
491 if (keylen != ctx->saltlen + CHACHA20_KEY_SIZE)
492 return -EINVAL;
493
494 keylen -= ctx->saltlen;
495 memcpy(ctx->salt, key + keylen, ctx->saltlen);
496
497 crypto_ablkcipher_clear_flags(ctx->chacha, CRYPTO_TFM_REQ_MASK);
498 crypto_ablkcipher_set_flags(ctx->chacha, crypto_aead_get_flags(aead) &
499 CRYPTO_TFM_REQ_MASK);
500
501 err = crypto_ablkcipher_setkey(ctx->chacha, key, keylen);
502 crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctx->chacha) &
503 CRYPTO_TFM_RES_MASK);
504 return err;
505}
506
507static int chachapoly_setauthsize(struct crypto_aead *tfm,
508 unsigned int authsize)
509{
510 if (authsize != POLY1305_DIGEST_SIZE)
511 return -EINVAL;
512
513 return 0;
514}
515
74790922 516static int chachapoly_init(struct crypto_aead *tfm)
71ebc4d1 517{
74790922
HX		 518 struct aead_instance *inst = aead_alg_instance(tfm);
519 struct chachapoly_instance_ctx *ictx = aead_instance_ctx(inst);
520 struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm);
71ebc4d1
MW		 521 struct crypto_ablkcipher *chacha;
522 struct crypto_ahash *poly;
523 unsigned long align;
524
525 poly = crypto_spawn_ahash(&ictx->poly);
526 if (IS_ERR(poly))
527 return PTR_ERR(poly);
528
529 chacha = crypto_spawn_skcipher(&ictx->chacha);
530 if (IS_ERR(chacha)) {
531 crypto_free_ahash(poly);
532 return PTR_ERR(chacha);
533 }
534
535 ctx->chacha = chacha;
536 ctx->poly = poly;
537 ctx->saltlen = ictx->saltlen;
538
74790922 539 align = crypto_aead_alignmask(tfm);
71ebc4d1 540 align &= ~(crypto_tfm_ctx_alignment() - 1);
74790922
HX		 541 crypto_aead_set_reqsize(
542 tfm,
543 align + offsetof(struct chachapoly_req_ctx, u) +
544 max(offsetof(struct chacha_req, req) +
545 sizeof(struct ablkcipher_request) +
546 crypto_ablkcipher_reqsize(chacha),
547 offsetof(struct poly_req, req) +
548 sizeof(struct ahash_request) +
549 crypto_ahash_reqsize(poly)));
71ebc4d1
MW		 550
551 return 0;
552}
553
74790922 554static void chachapoly_exit(struct crypto_aead *tfm)
71ebc4d1 555{
74790922 556 struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm);
71ebc4d1
MW		 557
558 crypto_free_ahash(ctx->poly);
559 crypto_free_ablkcipher(ctx->chacha);
560}
561
74790922
HX		 562static void chachapoly_free(struct aead_instance *inst)
563{
564 struct chachapoly_instance_ctx *ctx = aead_instance_ctx(inst);
565
566 crypto_drop_skcipher(&ctx->chacha);
567 crypto_drop_ahash(&ctx->poly);
568 kfree(inst);
569}
570
571static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb,
572 const char *name, unsigned int ivsize)
71ebc4d1
MW		 573{
574 struct crypto_attr_type *algt;
74790922 575 struct aead_instance *inst;
71ebc4d1
MW		 576 struct crypto_alg *chacha;
577 struct crypto_alg *poly;
74790922 578 struct hash_alg_common *poly_hash;
71ebc4d1
MW		 579 struct chachapoly_instance_ctx *ctx;
580 const char *chacha_name, *poly_name;
581 int err;
582
583 if (ivsize > CHACHAPOLY_IV_SIZE)
74790922 584 return -EINVAL;
71ebc4d1
MW		 585
586 algt = crypto_get_attr_type(tb);
587 if (IS_ERR(algt))
74790922 588 return PTR_ERR(algt);
71ebc4d1 589
74790922
HX		 590 if ((algt->type ^ (CRYPTO_ALG_TYPE_AEAD | CRYPTO_ALG_AEAD_NEW)) &
591 algt->mask)
592 return -EINVAL;
71ebc4d1
MW		 593
594 chacha_name = crypto_attr_alg_name(tb[1]);
595 if (IS_ERR(chacha_name))
74790922 596 return PTR_ERR(chacha_name);
71ebc4d1
MW		 597 poly_name = crypto_attr_alg_name(tb[2]);
598 if (IS_ERR(poly_name))
74790922 599 return PTR_ERR(poly_name);
71ebc4d1
MW		 600
601 poly = crypto_find_alg(poly_name, &crypto_ahash_type,
602 CRYPTO_ALG_TYPE_HASH,
603 CRYPTO_ALG_TYPE_AHASH_MASK);
604 if (IS_ERR(poly))
74790922 605 return PTR_ERR(poly);
71ebc4d1
MW		 606
607 err = -ENOMEM;
608 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL);
609 if (!inst)
610 goto out_put_poly;
611
74790922 612 ctx = aead_instance_ctx(inst);
71ebc4d1 613 ctx->saltlen = CHACHAPOLY_IV_SIZE - ivsize;
74790922
HX		 614 poly_hash = __crypto_hash_alg_common(poly);
615 err = crypto_init_ahash_spawn(&ctx->poly, poly_hash,
616 aead_crypto_instance(inst));
71ebc4d1
MW		 617 if (err)
618 goto err_free_inst;
619
74790922 620 crypto_set_skcipher_spawn(&ctx->chacha, aead_crypto_instance(inst));
71ebc4d1
MW		 621 err = crypto_grab_skcipher(&ctx->chacha, chacha_name, 0,
622 crypto_requires_sync(algt->type,
623 algt->mask));
624 if (err)
625 goto err_drop_poly;
626
627 chacha = crypto_skcipher_spawn_alg(&ctx->chacha);
628
629 err = -EINVAL;
630 /* Need 16-byte IV size, including Initial Block Counter value */
631 if (chacha->cra_ablkcipher.ivsize != CHACHA20_IV_SIZE)
632 goto out_drop_chacha;
633 /* Not a stream cipher? */
634 if (chacha->cra_blocksize != 1)
635 goto out_drop_chacha;
636
637 err = -ENAMETOOLONG;
74790922 638 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME,
71ebc4d1
MW		 639 "%s(%s,%s)", name, chacha_name,
640 poly_name) >= CRYPTO_MAX_ALG_NAME)
641 goto out_drop_chacha;
74790922 642 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME,
71ebc4d1
MW		 643 "%s(%s,%s)", name, chacha->cra_driver_name,
644 poly->cra_driver_name) >= CRYPTO_MAX_ALG_NAME)
645 goto out_drop_chacha;
646
74790922
HX		 647 inst->alg.base.cra_flags = (chacha->cra_flags | poly->cra_flags) &
648 CRYPTO_ALG_ASYNC;
649 inst->alg.base.cra_flags |= CRYPTO_ALG_AEAD_NEW;
650 inst->alg.base.cra_priority = (chacha->cra_priority +
651 poly->cra_priority) / 2;
652 inst->alg.base.cra_blocksize = 1;
653 inst->alg.base.cra_alignmask = chacha->cra_alignmask |
654 poly->cra_alignmask;
655 inst->alg.base.cra_ctxsize = sizeof(struct chachapoly_ctx) +
656 ctx->saltlen;
657 inst->alg.ivsize = ivsize;
658 inst->alg.maxauthsize = POLY1305_DIGEST_SIZE;
659 inst->alg.init = chachapoly_init;
660 inst->alg.exit = chachapoly_exit;
661 inst->alg.encrypt = chachapoly_encrypt;
662 inst->alg.decrypt = chachapoly_decrypt;
663 inst->alg.setkey = chachapoly_setkey;
664 inst->alg.setauthsize = chachapoly_setauthsize;
665
666 inst->free = chachapoly_free;
667
668 err = aead_register_instance(tmpl, inst);
669 if (err)
670 goto out_drop_chacha;
671
672out_put_poly:
71ebc4d1 673 crypto_mod_put(poly);
74790922 674 return err;
71ebc4d1
MW		 675
676out_drop_chacha:
677 crypto_drop_skcipher(&ctx->chacha);
678err_drop_poly:
679 crypto_drop_ahash(&ctx->poly);
680err_free_inst:
681 kfree(inst);
74790922 682 goto out_put_poly;
71ebc4d1
MW		 683}
684
74790922 685static int rfc7539_create(struct crypto_template *tmpl, struct rtattr **tb)
4db4ad26 686{
74790922 687 return chachapoly_create(tmpl, tb, "rfc7539", 12);
4db4ad26
MW		 688}
689
74790922 690static int rfc7539esp_create(struct crypto_template *tmpl, struct rtattr **tb)
71ebc4d1 691{
74790922 692 return chachapoly_create(tmpl, tb, "rfc7539esp", 8);
71ebc4d1
MW		 693}
694
695static struct crypto_template rfc7539_tmpl = {
696 .name = "rfc7539",
74790922 697 .create = rfc7539_create,
71ebc4d1
MW		 698 .module = THIS_MODULE,
699};
700
4db4ad26
MW		 701static struct crypto_template rfc7539esp_tmpl = {
702 .name = "rfc7539esp",
74790922 703 .create = rfc7539esp_create,
4db4ad26
MW		 704 .module = THIS_MODULE,
705};
706
71ebc4d1
MW		 707static int __init chacha20poly1305_module_init(void)
708{
4db4ad26
MW		 709 int err;
710
711 err = crypto_register_template(&rfc7539_tmpl);
712 if (err)
713 return err;
714
715 err = crypto_register_template(&rfc7539esp_tmpl);
716 if (err)
717 crypto_unregister_template(&rfc7539_tmpl);
718
719 return err;
71ebc4d1
MW		 720}
721
722static void __exit chacha20poly1305_module_exit(void)
723{
4db4ad26 724 crypto_unregister_template(&rfc7539esp_tmpl);
71ebc4d1
MW		 725 crypto_unregister_template(&rfc7539_tmpl);
726}
727
728module_init(chacha20poly1305_module_init);
729module_exit(chacha20poly1305_module_exit);
730
731MODULE_LICENSE("GPL");
732MODULE_AUTHOR("Martin Willi <martin@strongswan.org>");
733MODULE_DESCRIPTION("ChaCha20-Poly1305 AEAD");
71ebc4d1 734MODULE_ALIAS_CRYPTO("rfc7539");
4db4ad26 735MODULE_ALIAS_CRYPTO("rfc7539esp");
Linux 6.x block layer and io_uring tree(s)