Blame view
crypto/chacha20poly1305.c
18.7 KB
2874c5fd2 treewide: Replace... |
1 |
// SPDX-License-Identifier: GPL-2.0-or-later |
71ebc4d1b crypto: chacha20p... |
2 3 4 5 |
/* * ChaCha20-Poly1305 AEAD, RFC7539 * * Copyright (C) 2015 Martin Willi |
71ebc4d1b crypto: chacha20p... |
6 7 8 9 10 11 |
*/ #include <crypto/internal/aead.h> #include <crypto/internal/hash.h> #include <crypto/internal/skcipher.h> #include <crypto/scatterwalk.h> |
1ca1b9179 crypto: chacha20-... |
12 |
#include <crypto/chacha.h> |
2546f811e crypto: poly1305 ... |
13 |
#include <crypto/poly1305.h> |
71ebc4d1b crypto: chacha20p... |
14 15 16 17 18 19 |
#include <linux/err.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/module.h> #include "internal.h" |
71ebc4d1b crypto: chacha20p... |
20 21 22 23 24 25 26 |
struct chachapoly_instance_ctx { struct crypto_skcipher_spawn chacha; struct crypto_ahash_spawn poly; unsigned int saltlen; }; struct chachapoly_ctx { |
1e1f00611 crypto: chacha20p... |
27 |
struct crypto_skcipher *chacha; |
71ebc4d1b crypto: chacha20p... |
28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 |
struct crypto_ahash *poly; /* key bytes we use for the ChaCha20 IV */ unsigned int saltlen; u8 salt[]; }; struct poly_req { /* zero byte padding for AD/ciphertext, as needed */ u8 pad[POLY1305_BLOCK_SIZE]; /* tail data with AD/ciphertext lengths */ struct { __le64 assoclen; __le64 cryptlen; } tail; struct scatterlist src[1]; struct ahash_request req; /* must be last member */ }; struct chacha_req { |
1ca1b9179 crypto: chacha20-... |
47 |
u8 iv[CHACHA_IV_SIZE]; |
71ebc4d1b crypto: chacha20p... |
48 |
struct scatterlist src[1]; |
1e1f00611 crypto: chacha20p... |
49 |
struct skcipher_request req; /* must be last member */ |
71ebc4d1b crypto: chacha20p... |
50 51 52 |
}; struct chachapoly_req_ctx { |
747909223 crypto: chacha20p... |
53 54 |
struct scatterlist src[2]; struct scatterlist dst[2]; |
c2b7b20ae crypto: poly1305 ... |
55 56 |
/* the key we generate for Poly1305 using Chacha20 */ u8 key[POLY1305_KEY_SIZE]; |
71ebc4d1b crypto: chacha20p... |
57 58 59 60 |
/* calculated Poly1305 tag */ u8 tag[POLY1305_DIGEST_SIZE]; /* length of data to en/decrypt, without ICV */ unsigned int cryptlen; |
747909223 crypto: chacha20p... |
61 62 |
/* Actual AD, excluding IV */ unsigned int assoclen; |
7545b6c20 crypto: chacha20p... |
63 64 |
/* request flags, with MAY_SLEEP cleared if needed */ u32 flags; |
71ebc4d1b crypto: chacha20p... |
65 66 67 68 69 70 71 72 73 |
union { struct poly_req poly; struct chacha_req chacha; } u; }; static inline void async_done_continue(struct aead_request *req, int err, int (*cont)(struct aead_request *)) { |
7545b6c20 crypto: chacha20p... |
74 75 76 77 |
if (!err) { struct chachapoly_req_ctx *rctx = aead_request_ctx(req); rctx->flags &= ~CRYPTO_TFM_REQ_MAY_SLEEP; |
71ebc4d1b crypto: chacha20p... |
78 |
err = cont(req); |
7545b6c20 crypto: chacha20p... |
79 |
} |
71ebc4d1b crypto: chacha20p... |
80 81 82 83 84 85 86 87 88 89 90 91 92 |
if (err != -EINPROGRESS && err != -EBUSY) aead_request_complete(req, err); } static void chacha_iv(u8 *iv, struct aead_request *req, u32 icb) { struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); __le32 leicb = cpu_to_le32(icb); memcpy(iv, &leicb, sizeof(leicb)); memcpy(iv + sizeof(leicb), ctx->salt, ctx->saltlen); memcpy(iv + sizeof(leicb) + ctx->saltlen, req->iv, |
1ca1b9179 crypto: chacha20-... |
93 |
CHACHA_IV_SIZE - sizeof(leicb) - ctx->saltlen); |
71ebc4d1b crypto: chacha20p... |
94 95 96 97 98 99 |
} static int poly_verify_tag(struct aead_request *req) { struct chachapoly_req_ctx *rctx = aead_request_ctx(req); u8 tag[sizeof(rctx->tag)]; |
747909223 crypto: chacha20p... |
100 101 102 |
scatterwalk_map_and_copy(tag, req->src, req->assoclen + rctx->cryptlen, sizeof(tag), 0); |
71ebc4d1b crypto: chacha20p... |
103 104 105 106 107 108 109 110 |
if (crypto_memneq(tag, rctx->tag, sizeof(tag))) return -EBADMSG; return 0; } static int poly_copy_tag(struct aead_request *req) { struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
747909223 crypto: chacha20p... |
111 112 |
scatterwalk_map_and_copy(rctx->tag, req->dst, req->assoclen + rctx->cryptlen, |
71ebc4d1b crypto: chacha20p... |
113 114 115 116 117 118 119 120 121 122 123 124 125 126 |
sizeof(rctx->tag), 1); return 0; } static void chacha_decrypt_done(struct crypto_async_request *areq, int err) { async_done_continue(areq->data, err, poly_verify_tag); } static int chacha_decrypt(struct aead_request *req) { struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); struct chachapoly_req_ctx *rctx = aead_request_ctx(req); struct chacha_req *creq = &rctx->u.chacha; |
747909223 crypto: chacha20p... |
127 |
struct scatterlist *src, *dst; |
71ebc4d1b crypto: chacha20p... |
128 |
int err; |
161151d79 crypto: chacha20p... |
129 130 |
if (rctx->cryptlen == 0) goto skip; |
71ebc4d1b crypto: chacha20p... |
131 |
chacha_iv(creq->iv, req, 1); |
747909223 crypto: chacha20p... |
132 133 |
src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen); dst = src; |
76cadf224 crypto: chacha20p... |
134 |
if (req->src != req->dst) |
747909223 crypto: chacha20p... |
135 |
dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen); |
747909223 crypto: chacha20p... |
136 |
|
7545b6c20 crypto: chacha20p... |
137 |
skcipher_request_set_callback(&creq->req, rctx->flags, |
1e1f00611 crypto: chacha20p... |
138 139 140 141 142 |
chacha_decrypt_done, req); skcipher_request_set_tfm(&creq->req, ctx->chacha); skcipher_request_set_crypt(&creq->req, src, dst, rctx->cryptlen, creq->iv); err = crypto_skcipher_decrypt(&creq->req); |
71ebc4d1b crypto: chacha20p... |
143 144 |
if (err) return err; |
161151d79 crypto: chacha20p... |
145 |
skip: |
71ebc4d1b crypto: chacha20p... |
146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 |
return poly_verify_tag(req); } static int poly_tail_continue(struct aead_request *req) { struct chachapoly_req_ctx *rctx = aead_request_ctx(req); if (rctx->cryptlen == req->cryptlen) /* encrypting */ return poly_copy_tag(req); return chacha_decrypt(req); } static void poly_tail_done(struct crypto_async_request *areq, int err) { async_done_continue(areq->data, err, poly_tail_continue); } static int poly_tail(struct aead_request *req) { |
747909223 crypto: chacha20p... |
166 167 |
struct crypto_aead *tfm = crypto_aead_reqtfm(req); struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
71ebc4d1b crypto: chacha20p... |
168 169 |
struct chachapoly_req_ctx *rctx = aead_request_ctx(req); struct poly_req *preq = &rctx->u.poly; |
71ebc4d1b crypto: chacha20p... |
170 |
int err; |
76cadf224 crypto: chacha20p... |
171 172 173 |
preq->tail.assoclen = cpu_to_le64(rctx->assoclen); preq->tail.cryptlen = cpu_to_le64(rctx->cryptlen); sg_init_one(preq->src, &preq->tail, sizeof(preq->tail)); |
71ebc4d1b crypto: chacha20p... |
174 |
|
7545b6c20 crypto: chacha20p... |
175 |
ahash_request_set_callback(&preq->req, rctx->flags, |
71ebc4d1b crypto: chacha20p... |
176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 |
poly_tail_done, req); ahash_request_set_tfm(&preq->req, ctx->poly); ahash_request_set_crypt(&preq->req, preq->src, rctx->tag, sizeof(preq->tail)); err = crypto_ahash_finup(&preq->req); if (err) return err; return poly_tail_continue(req); } static void poly_cipherpad_done(struct crypto_async_request *areq, int err) { async_done_continue(areq->data, err, poly_tail); } static int poly_cipherpad(struct aead_request *req) { struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); struct chachapoly_req_ctx *rctx = aead_request_ctx(req); struct poly_req *preq = &rctx->u.poly; |
76cadf224 crypto: chacha20p... |
198 |
unsigned int padlen; |
71ebc4d1b crypto: chacha20p... |
199 |
int err; |
76cadf224 crypto: chacha20p... |
200 |
padlen = -rctx->cryptlen % POLY1305_BLOCK_SIZE; |
71ebc4d1b crypto: chacha20p... |
201 |
memset(preq->pad, 0, sizeof(preq->pad)); |
76cadf224 crypto: chacha20p... |
202 |
sg_init_one(preq->src, preq->pad, padlen); |
71ebc4d1b crypto: chacha20p... |
203 |
|
7545b6c20 crypto: chacha20p... |
204 |
ahash_request_set_callback(&preq->req, rctx->flags, |
71ebc4d1b crypto: chacha20p... |
205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 |
poly_cipherpad_done, req); ahash_request_set_tfm(&preq->req, ctx->poly); ahash_request_set_crypt(&preq->req, preq->src, NULL, padlen); err = crypto_ahash_update(&preq->req); if (err) return err; return poly_tail(req); } static void poly_cipher_done(struct crypto_async_request *areq, int err) { async_done_continue(areq->data, err, poly_cipherpad); } static int poly_cipher(struct aead_request *req) { struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); struct chachapoly_req_ctx *rctx = aead_request_ctx(req); struct poly_req *preq = &rctx->u.poly; struct scatterlist *crypt = req->src; int err; if (rctx->cryptlen == req->cryptlen) /* encrypting */ crypt = req->dst; |
747909223 crypto: chacha20p... |
231 |
crypt = scatterwalk_ffwd(rctx->src, crypt, req->assoclen); |
7545b6c20 crypto: chacha20p... |
232 |
ahash_request_set_callback(&preq->req, rctx->flags, |
71ebc4d1b crypto: chacha20p... |
233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 |
poly_cipher_done, req); ahash_request_set_tfm(&preq->req, ctx->poly); ahash_request_set_crypt(&preq->req, crypt, NULL, rctx->cryptlen); err = crypto_ahash_update(&preq->req); if (err) return err; return poly_cipherpad(req); } static void poly_adpad_done(struct crypto_async_request *areq, int err) { async_done_continue(areq->data, err, poly_cipher); } static int poly_adpad(struct aead_request *req) { struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); struct chachapoly_req_ctx *rctx = aead_request_ctx(req); struct poly_req *preq = &rctx->u.poly; |
76cadf224 crypto: chacha20p... |
254 |
unsigned int padlen; |
71ebc4d1b crypto: chacha20p... |
255 |
int err; |
76cadf224 crypto: chacha20p... |
256 |
padlen = -rctx->assoclen % POLY1305_BLOCK_SIZE; |
71ebc4d1b crypto: chacha20p... |
257 |
memset(preq->pad, 0, sizeof(preq->pad)); |
76cadf224 crypto: chacha20p... |
258 |
sg_init_one(preq->src, preq->pad, padlen); |
71ebc4d1b crypto: chacha20p... |
259 |
|
7545b6c20 crypto: chacha20p... |
260 |
ahash_request_set_callback(&preq->req, rctx->flags, |
71ebc4d1b crypto: chacha20p... |
261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 |
poly_adpad_done, req); ahash_request_set_tfm(&preq->req, ctx->poly); ahash_request_set_crypt(&preq->req, preq->src, NULL, padlen); err = crypto_ahash_update(&preq->req); if (err) return err; return poly_cipher(req); } static void poly_ad_done(struct crypto_async_request *areq, int err) { async_done_continue(areq->data, err, poly_adpad); } static int poly_ad(struct aead_request *req) { struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); struct chachapoly_req_ctx *rctx = aead_request_ctx(req); struct poly_req *preq = &rctx->u.poly; int err; |
7545b6c20 crypto: chacha20p... |
283 |
ahash_request_set_callback(&preq->req, rctx->flags, |
71ebc4d1b crypto: chacha20p... |
284 285 |
poly_ad_done, req); ahash_request_set_tfm(&preq->req, ctx->poly); |
747909223 crypto: chacha20p... |
286 |
ahash_request_set_crypt(&preq->req, req->src, NULL, rctx->assoclen); |
71ebc4d1b crypto: chacha20p... |
287 288 289 290 291 292 293 |
err = crypto_ahash_update(&preq->req); if (err) return err; return poly_adpad(req); } |
c2b7b20ae crypto: poly1305 ... |
294 |
static void poly_setkey_done(struct crypto_async_request *areq, int err) |
71ebc4d1b crypto: chacha20p... |
295 296 297 |
{ async_done_continue(areq->data, err, poly_ad); } |
c2b7b20ae crypto: poly1305 ... |
298 |
static int poly_setkey(struct aead_request *req) |
71ebc4d1b crypto: chacha20p... |
299 300 301 302 303 |
{ struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); struct chachapoly_req_ctx *rctx = aead_request_ctx(req); struct poly_req *preq = &rctx->u.poly; int err; |
76cadf224 crypto: chacha20p... |
304 |
sg_init_one(preq->src, rctx->key, sizeof(rctx->key)); |
c2b7b20ae crypto: poly1305 ... |
305 |
|
7545b6c20 crypto: chacha20p... |
306 |
ahash_request_set_callback(&preq->req, rctx->flags, |
c2b7b20ae crypto: poly1305 ... |
307 |
poly_setkey_done, req); |
71ebc4d1b crypto: chacha20p... |
308 |
ahash_request_set_tfm(&preq->req, ctx->poly); |
c2b7b20ae crypto: poly1305 ... |
309 |
ahash_request_set_crypt(&preq->req, preq->src, NULL, sizeof(rctx->key)); |
71ebc4d1b crypto: chacha20p... |
310 |
|
c2b7b20ae crypto: poly1305 ... |
311 |
err = crypto_ahash_update(&preq->req); |
71ebc4d1b crypto: chacha20p... |
312 313 314 315 316 |
if (err) return err; return poly_ad(req); } |
c2b7b20ae crypto: poly1305 ... |
317 |
static void poly_init_done(struct crypto_async_request *areq, int err) |
71ebc4d1b crypto: chacha20p... |
318 |
{ |
c2b7b20ae crypto: poly1305 ... |
319 320 321 322 323 324 |
async_done_continue(areq->data, err, poly_setkey); } static int poly_init(struct aead_request *req) { struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); |
71ebc4d1b crypto: chacha20p... |
325 |
struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
c2b7b20ae crypto: poly1305 ... |
326 |
struct poly_req *preq = &rctx->u.poly; |
71ebc4d1b crypto: chacha20p... |
327 |
int err; |
7545b6c20 crypto: chacha20p... |
328 |
ahash_request_set_callback(&preq->req, rctx->flags, |
c2b7b20ae crypto: poly1305 ... |
329 330 |
poly_init_done, req); ahash_request_set_tfm(&preq->req, ctx->poly); |
71ebc4d1b crypto: chacha20p... |
331 |
|
c2b7b20ae crypto: poly1305 ... |
332 |
err = crypto_ahash_init(&preq->req); |
71ebc4d1b crypto: chacha20p... |
333 334 |
if (err) return err; |
c2b7b20ae crypto: poly1305 ... |
335 |
return poly_setkey(req); |
71ebc4d1b crypto: chacha20p... |
336 337 338 339 |
} static void poly_genkey_done(struct crypto_async_request *areq, int err) { |
c2b7b20ae crypto: poly1305 ... |
340 |
async_done_continue(areq->data, err, poly_init); |
71ebc4d1b crypto: chacha20p... |
341 342 343 344 |
} static int poly_genkey(struct aead_request *req) { |
747909223 crypto: chacha20p... |
345 346 |
struct crypto_aead *tfm = crypto_aead_reqtfm(req); struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
71ebc4d1b crypto: chacha20p... |
347 348 349 |
struct chachapoly_req_ctx *rctx = aead_request_ctx(req); struct chacha_req *creq = &rctx->u.chacha; int err; |
747909223 crypto: chacha20p... |
350 351 352 353 354 355 356 |
rctx->assoclen = req->assoclen; if (crypto_aead_ivsize(tfm) == 8) { if (rctx->assoclen < 8) return -EINVAL; rctx->assoclen -= 8; } |
c2b7b20ae crypto: poly1305 ... |
357 |
memset(rctx->key, 0, sizeof(rctx->key)); |
76cadf224 crypto: chacha20p... |
358 |
sg_init_one(creq->src, rctx->key, sizeof(rctx->key)); |
71ebc4d1b crypto: chacha20p... |
359 360 |
chacha_iv(creq->iv, req, 0); |
7545b6c20 crypto: chacha20p... |
361 |
skcipher_request_set_callback(&creq->req, rctx->flags, |
1e1f00611 crypto: chacha20p... |
362 363 364 365 |
poly_genkey_done, req); skcipher_request_set_tfm(&creq->req, ctx->chacha); skcipher_request_set_crypt(&creq->req, creq->src, creq->src, POLY1305_KEY_SIZE, creq->iv); |
71ebc4d1b crypto: chacha20p... |
366 |
|
1e1f00611 crypto: chacha20p... |
367 |
err = crypto_skcipher_decrypt(&creq->req); |
71ebc4d1b crypto: chacha20p... |
368 369 |
if (err) return err; |
c2b7b20ae crypto: poly1305 ... |
370 |
return poly_init(req); |
71ebc4d1b crypto: chacha20p... |
371 372 373 374 375 376 377 378 379 380 381 382 |
} static void chacha_encrypt_done(struct crypto_async_request *areq, int err) { async_done_continue(areq->data, err, poly_genkey); } static int chacha_encrypt(struct aead_request *req) { struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); struct chachapoly_req_ctx *rctx = aead_request_ctx(req); struct chacha_req *creq = &rctx->u.chacha; |
747909223 crypto: chacha20p... |
383 |
struct scatterlist *src, *dst; |
71ebc4d1b crypto: chacha20p... |
384 |
int err; |
161151d79 crypto: chacha20p... |
385 386 |
if (req->cryptlen == 0) goto skip; |
71ebc4d1b crypto: chacha20p... |
387 |
chacha_iv(creq->iv, req, 1); |
747909223 crypto: chacha20p... |
388 389 |
src = scatterwalk_ffwd(rctx->src, req->src, req->assoclen); dst = src; |
76cadf224 crypto: chacha20p... |
390 |
if (req->src != req->dst) |
747909223 crypto: chacha20p... |
391 |
dst = scatterwalk_ffwd(rctx->dst, req->dst, req->assoclen); |
747909223 crypto: chacha20p... |
392 |
|
7545b6c20 crypto: chacha20p... |
393 |
skcipher_request_set_callback(&creq->req, rctx->flags, |
1e1f00611 crypto: chacha20p... |
394 395 396 397 398 |
chacha_encrypt_done, req); skcipher_request_set_tfm(&creq->req, ctx->chacha); skcipher_request_set_crypt(&creq->req, src, dst, req->cryptlen, creq->iv); err = crypto_skcipher_encrypt(&creq->req); |
71ebc4d1b crypto: chacha20p... |
399 400 |
if (err) return err; |
161151d79 crypto: chacha20p... |
401 |
skip: |
71ebc4d1b crypto: chacha20p... |
402 403 404 405 406 407 408 409 |
return poly_genkey(req); } static int chachapoly_encrypt(struct aead_request *req) { struct chachapoly_req_ctx *rctx = aead_request_ctx(req); rctx->cryptlen = req->cryptlen; |
7545b6c20 crypto: chacha20p... |
410 |
rctx->flags = aead_request_flags(req); |
71ebc4d1b crypto: chacha20p... |
411 412 413 |
/* encrypt call chain: * - chacha_encrypt/done() |
c2b7b20ae crypto: poly1305 ... |
414 |
* - poly_genkey/done() |
71ebc4d1b crypto: chacha20p... |
415 |
* - poly_init/done() |
c2b7b20ae crypto: poly1305 ... |
416 |
* - poly_setkey/done() |
71ebc4d1b crypto: chacha20p... |
417 418 419 420 421 422 423 424 425 426 427 428 429 |
* - poly_ad/done() * - poly_adpad/done() * - poly_cipher/done() * - poly_cipherpad/done() * - poly_tail/done/continue() * - poly_copy_tag() */ return chacha_encrypt(req); } static int chachapoly_decrypt(struct aead_request *req) { struct chachapoly_req_ctx *rctx = aead_request_ctx(req); |
71ebc4d1b crypto: chacha20p... |
430 |
rctx->cryptlen = req->cryptlen - POLY1305_DIGEST_SIZE; |
7545b6c20 crypto: chacha20p... |
431 |
rctx->flags = aead_request_flags(req); |
71ebc4d1b crypto: chacha20p... |
432 433 |
/* decrypt call chain: |
c2b7b20ae crypto: poly1305 ... |
434 |
* - poly_genkey/done() |
71ebc4d1b crypto: chacha20p... |
435 |
* - poly_init/done() |
c2b7b20ae crypto: poly1305 ... |
436 |
* - poly_setkey/done() |
71ebc4d1b crypto: chacha20p... |
437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 |
* - poly_ad/done() * - poly_adpad/done() * - poly_cipher/done() * - poly_cipherpad/done() * - poly_tail/done/continue() * - chacha_decrypt/done() * - poly_verify_tag() */ return poly_genkey(req); } static int chachapoly_setkey(struct crypto_aead *aead, const u8 *key, unsigned int keylen) { struct chachapoly_ctx *ctx = crypto_aead_ctx(aead); int err; |
1ca1b9179 crypto: chacha20-... |
453 |
if (keylen != ctx->saltlen + CHACHA_KEY_SIZE) |
71ebc4d1b crypto: chacha20p... |
454 455 456 457 |
return -EINVAL; keylen -= ctx->saltlen; memcpy(ctx->salt, key + keylen, ctx->saltlen); |
1e1f00611 crypto: chacha20p... |
458 459 460 |
crypto_skcipher_clear_flags(ctx->chacha, CRYPTO_TFM_REQ_MASK); crypto_skcipher_set_flags(ctx->chacha, crypto_aead_get_flags(aead) & CRYPTO_TFM_REQ_MASK); |
71ebc4d1b crypto: chacha20p... |
461 |
|
1e1f00611 crypto: chacha20p... |
462 463 464 |
err = crypto_skcipher_setkey(ctx->chacha, key, keylen); crypto_aead_set_flags(aead, crypto_skcipher_get_flags(ctx->chacha) & CRYPTO_TFM_RES_MASK); |
71ebc4d1b crypto: chacha20p... |
465 466 467 468 469 470 471 472 473 474 475 |
return err; } static int chachapoly_setauthsize(struct crypto_aead *tfm, unsigned int authsize) { if (authsize != POLY1305_DIGEST_SIZE) return -EINVAL; return 0; } |
747909223 crypto: chacha20p... |
476 |
static int chachapoly_init(struct crypto_aead *tfm) |
71ebc4d1b crypto: chacha20p... |
477 |
{ |
747909223 crypto: chacha20p... |
478 479 480 |
struct aead_instance *inst = aead_alg_instance(tfm); struct chachapoly_instance_ctx *ictx = aead_instance_ctx(inst); struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
1e1f00611 crypto: chacha20p... |
481 |
struct crypto_skcipher *chacha; |
71ebc4d1b crypto: chacha20p... |
482 483 484 485 486 487 |
struct crypto_ahash *poly; unsigned long align; poly = crypto_spawn_ahash(&ictx->poly); if (IS_ERR(poly)) return PTR_ERR(poly); |
60425a8ba crypto: skcipher ... |
488 |
chacha = crypto_spawn_skcipher(&ictx->chacha); |
71ebc4d1b crypto: chacha20p... |
489 490 491 492 493 494 495 496 |
if (IS_ERR(chacha)) { crypto_free_ahash(poly); return PTR_ERR(chacha); } ctx->chacha = chacha; ctx->poly = poly; ctx->saltlen = ictx->saltlen; |
747909223 crypto: chacha20p... |
497 |
align = crypto_aead_alignmask(tfm); |
71ebc4d1b crypto: chacha20p... |
498 |
align &= ~(crypto_tfm_ctx_alignment() - 1); |
747909223 crypto: chacha20p... |
499 500 501 502 |
crypto_aead_set_reqsize( tfm, align + offsetof(struct chachapoly_req_ctx, u) + max(offsetof(struct chacha_req, req) + |
1e1f00611 crypto: chacha20p... |
503 504 |
sizeof(struct skcipher_request) + crypto_skcipher_reqsize(chacha), |
747909223 crypto: chacha20p... |
505 506 507 |
offsetof(struct poly_req, req) + sizeof(struct ahash_request) + crypto_ahash_reqsize(poly))); |
71ebc4d1b crypto: chacha20p... |
508 509 510 |
return 0; } |
747909223 crypto: chacha20p... |
511 |
static void chachapoly_exit(struct crypto_aead *tfm) |
71ebc4d1b crypto: chacha20p... |
512 |
{ |
747909223 crypto: chacha20p... |
513 |
struct chachapoly_ctx *ctx = crypto_aead_ctx(tfm); |
71ebc4d1b crypto: chacha20p... |
514 515 |
crypto_free_ahash(ctx->poly); |
1e1f00611 crypto: chacha20p... |
516 |
crypto_free_skcipher(ctx->chacha); |
71ebc4d1b crypto: chacha20p... |
517 |
} |
747909223 crypto: chacha20p... |
518 519 520 521 522 523 524 525 526 527 528 |
static void chachapoly_free(struct aead_instance *inst) { struct chachapoly_instance_ctx *ctx = aead_instance_ctx(inst); crypto_drop_skcipher(&ctx->chacha); crypto_drop_ahash(&ctx->poly); kfree(inst); } static int chachapoly_create(struct crypto_template *tmpl, struct rtattr **tb, const char *name, unsigned int ivsize) |
71ebc4d1b crypto: chacha20p... |
529 530 |
{ struct crypto_attr_type *algt; |
747909223 crypto: chacha20p... |
531 |
struct aead_instance *inst; |
1e1f00611 crypto: chacha20p... |
532 |
struct skcipher_alg *chacha; |
71ebc4d1b crypto: chacha20p... |
533 |
struct crypto_alg *poly; |
747909223 crypto: chacha20p... |
534 |
struct hash_alg_common *poly_hash; |
71ebc4d1b crypto: chacha20p... |
535 536 537 538 539 |
struct chachapoly_instance_ctx *ctx; const char *chacha_name, *poly_name; int err; if (ivsize > CHACHAPOLY_IV_SIZE) |
747909223 crypto: chacha20p... |
540 |
return -EINVAL; |
71ebc4d1b crypto: chacha20p... |
541 542 543 |
algt = crypto_get_attr_type(tb); if (IS_ERR(algt)) |
747909223 crypto: chacha20p... |
544 |
return PTR_ERR(algt); |
71ebc4d1b crypto: chacha20p... |
545 |
|
5e4b8c1fc crypto: aead - Re... |
546 |
if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) |
747909223 crypto: chacha20p... |
547 |
return -EINVAL; |
71ebc4d1b crypto: chacha20p... |
548 549 550 |
chacha_name = crypto_attr_alg_name(tb[1]); if (IS_ERR(chacha_name)) |
747909223 crypto: chacha20p... |
551 |
return PTR_ERR(chacha_name); |
71ebc4d1b crypto: chacha20p... |
552 553 |
poly_name = crypto_attr_alg_name(tb[2]); if (IS_ERR(poly_name)) |
747909223 crypto: chacha20p... |
554 |
return PTR_ERR(poly_name); |
71ebc4d1b crypto: chacha20p... |
555 556 557 |
poly = crypto_find_alg(poly_name, &crypto_ahash_type, CRYPTO_ALG_TYPE_HASH, |
1e1f00611 crypto: chacha20p... |
558 559 560 |
CRYPTO_ALG_TYPE_AHASH_MASK | crypto_requires_sync(algt->type, algt->mask)); |
71ebc4d1b crypto: chacha20p... |
561 |
if (IS_ERR(poly)) |
747909223 crypto: chacha20p... |
562 |
return PTR_ERR(poly); |
e57121d08 crypto: chacha20p... |
563 564 565 566 567 |
poly_hash = __crypto_hash_alg_common(poly); err = -EINVAL; if (poly_hash->digestsize != POLY1305_DIGEST_SIZE) goto out_put_poly; |
71ebc4d1b crypto: chacha20p... |
568 569 570 571 572 |
err = -ENOMEM; inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); if (!inst) goto out_put_poly; |
747909223 crypto: chacha20p... |
573 |
ctx = aead_instance_ctx(inst); |
71ebc4d1b crypto: chacha20p... |
574 |
ctx->saltlen = CHACHAPOLY_IV_SIZE - ivsize; |
747909223 crypto: chacha20p... |
575 576 |
err = crypto_init_ahash_spawn(&ctx->poly, poly_hash, aead_crypto_instance(inst)); |
71ebc4d1b crypto: chacha20p... |
577 578 |
if (err) goto err_free_inst; |
747909223 crypto: chacha20p... |
579 |
crypto_set_skcipher_spawn(&ctx->chacha, aead_crypto_instance(inst)); |
a35528eca crypto: skcipher ... |
580 581 582 |
err = crypto_grab_skcipher(&ctx->chacha, chacha_name, 0, crypto_requires_sync(algt->type, algt->mask)); |
71ebc4d1b crypto: chacha20p... |
583 584 |
if (err) goto err_drop_poly; |
1e1f00611 crypto: chacha20p... |
585 |
chacha = crypto_spawn_skcipher_alg(&ctx->chacha); |
71ebc4d1b crypto: chacha20p... |
586 587 588 |
err = -EINVAL; /* Need 16-byte IV size, including Initial Block Counter value */ |
1ca1b9179 crypto: chacha20-... |
589 |
if (crypto_skcipher_alg_ivsize(chacha) != CHACHA_IV_SIZE) |
71ebc4d1b crypto: chacha20p... |
590 591 |
goto out_drop_chacha; /* Not a stream cipher? */ |
1e1f00611 crypto: chacha20p... |
592 |
if (chacha->base.cra_blocksize != 1) |
71ebc4d1b crypto: chacha20p... |
593 594 595 |
goto out_drop_chacha; err = -ENAMETOOLONG; |
747909223 crypto: chacha20p... |
596 |
if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, |
5e27f38f1 crypto: chacha20p... |
597 598 |
"%s(%s,%s)", name, chacha->base.cra_name, poly->cra_name) >= CRYPTO_MAX_ALG_NAME) |
71ebc4d1b crypto: chacha20p... |
599 |
goto out_drop_chacha; |
747909223 crypto: chacha20p... |
600 |
if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, |
1e1f00611 crypto: chacha20p... |
601 |
"%s(%s,%s)", name, chacha->base.cra_driver_name, |
71ebc4d1b crypto: chacha20p... |
602 603 |
poly->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) goto out_drop_chacha; |
1e1f00611 crypto: chacha20p... |
604 |
inst->alg.base.cra_flags = (chacha->base.cra_flags | poly->cra_flags) & |
747909223 crypto: chacha20p... |
605 |
CRYPTO_ALG_ASYNC; |
1e1f00611 crypto: chacha20p... |
606 |
inst->alg.base.cra_priority = (chacha->base.cra_priority + |
747909223 crypto: chacha20p... |
607 608 |
poly->cra_priority) / 2; inst->alg.base.cra_blocksize = 1; |
1e1f00611 crypto: chacha20p... |
609 |
inst->alg.base.cra_alignmask = chacha->base.cra_alignmask | |
747909223 crypto: chacha20p... |
610 611 612 613 |
poly->cra_alignmask; inst->alg.base.cra_ctxsize = sizeof(struct chachapoly_ctx) + ctx->saltlen; inst->alg.ivsize = ivsize; |
1e1f00611 crypto: chacha20p... |
614 |
inst->alg.chunksize = crypto_skcipher_alg_chunksize(chacha); |
747909223 crypto: chacha20p... |
615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 |
inst->alg.maxauthsize = POLY1305_DIGEST_SIZE; inst->alg.init = chachapoly_init; inst->alg.exit = chachapoly_exit; inst->alg.encrypt = chachapoly_encrypt; inst->alg.decrypt = chachapoly_decrypt; inst->alg.setkey = chachapoly_setkey; inst->alg.setauthsize = chachapoly_setauthsize; inst->free = chachapoly_free; err = aead_register_instance(tmpl, inst); if (err) goto out_drop_chacha; out_put_poly: |
71ebc4d1b crypto: chacha20p... |
630 |
crypto_mod_put(poly); |
747909223 crypto: chacha20p... |
631 |
return err; |
71ebc4d1b crypto: chacha20p... |
632 633 634 635 636 637 638 |
out_drop_chacha: crypto_drop_skcipher(&ctx->chacha); err_drop_poly: crypto_drop_ahash(&ctx->poly); err_free_inst: kfree(inst); |
747909223 crypto: chacha20p... |
639 |
goto out_put_poly; |
71ebc4d1b crypto: chacha20p... |
640 |
} |
747909223 crypto: chacha20p... |
641 |
static int rfc7539_create(struct crypto_template *tmpl, struct rtattr **tb) |
4db4ad260 crypto: chacha20p... |
642 |
{ |
747909223 crypto: chacha20p... |
643 |
return chachapoly_create(tmpl, tb, "rfc7539", 12); |
4db4ad260 crypto: chacha20p... |
644 |
} |
747909223 crypto: chacha20p... |
645 |
static int rfc7539esp_create(struct crypto_template *tmpl, struct rtattr **tb) |
71ebc4d1b crypto: chacha20p... |
646 |
{ |
747909223 crypto: chacha20p... |
647 |
return chachapoly_create(tmpl, tb, "rfc7539esp", 8); |
71ebc4d1b crypto: chacha20p... |
648 |
} |
1a5e02b68 crypto: chacha20p... |
649 650 651 652 653 654 655 656 657 658 |
static struct crypto_template rfc7539_tmpls[] = { { .name = "rfc7539", .create = rfc7539_create, .module = THIS_MODULE, }, { .name = "rfc7539esp", .create = rfc7539esp_create, .module = THIS_MODULE, }, |
4db4ad260 crypto: chacha20p... |
659 |
}; |
71ebc4d1b crypto: chacha20p... |
660 661 |
static int __init chacha20poly1305_module_init(void) { |
1a5e02b68 crypto: chacha20p... |
662 663 |
return crypto_register_templates(rfc7539_tmpls, ARRAY_SIZE(rfc7539_tmpls)); |
71ebc4d1b crypto: chacha20p... |
664 665 666 667 |
} static void __exit chacha20poly1305_module_exit(void) { |
1a5e02b68 crypto: chacha20p... |
668 669 |
crypto_unregister_templates(rfc7539_tmpls, ARRAY_SIZE(rfc7539_tmpls)); |
71ebc4d1b crypto: chacha20p... |
670 |
} |
c4741b230 crypto: run initc... |
671 |
subsys_initcall(chacha20poly1305_module_init); |
71ebc4d1b crypto: chacha20p... |
672 673 674 675 676 |
module_exit(chacha20poly1305_module_exit); MODULE_LICENSE("GPL"); MODULE_AUTHOR("Martin Willi <martin@strongswan.org>"); MODULE_DESCRIPTION("ChaCha20-Poly1305 AEAD"); |
71ebc4d1b crypto: chacha20p... |
677 |
MODULE_ALIAS_CRYPTO("rfc7539"); |
4db4ad260 crypto: chacha20p... |
678 |
MODULE_ALIAS_CRYPTO("rfc7539esp"); |