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> 16 #include <linux/err.h> 17 #include <linux/init.h> 18 #include <linux/kernel.h> 19 #include <linux/module.h> 20 21 #include "internal.h" 22 23 #define POLY1305_BLOCK_SIZE 16 24 #define POLY1305_DIGEST_SIZE 16 25 #define POLY1305_KEY_SIZE 32 26 #define CHACHA20_KEY_SIZE 32 27 #define CHACHA20_IV_SIZE 16 28 #define CHACHAPOLY_IV_SIZE 12 29 30 struct chachapoly_instance_ctx { 31 struct crypto_skcipher_spawn chacha; 32 struct crypto_ahash_spawn poly; 33 unsigned int saltlen; 34 }; 35 36 struct chachapoly_ctx { 37 struct crypto_ablkcipher *chacha; 38 struct crypto_ahash *poly; 39 /* key bytes we use for the ChaCha20 IV */ 40 unsigned int saltlen; 41 u8 salt[]; 42 }; 43 44 struct poly_req { 45 /* zero byte padding for AD/ciphertext, as needed */ 46 u8 pad[POLY1305_BLOCK_SIZE]; 47 /* tail data with AD/ciphertext lengths */ 48 struct { 49 __le64 assoclen; 50 __le64 cryptlen; 51 } tail; 52 struct scatterlist src[1]; 53 struct ahash_request req; /* must be last member */ 54 }; 55 56 struct chacha_req { 57 u8 iv[CHACHA20_IV_SIZE]; 58 struct scatterlist src[1]; 59 struct ablkcipher_request req; /* must be last member */ 60 }; 61 62 struct chachapoly_req_ctx { 63 /* the key we generate for Poly1305 using Chacha20 */ 64 u8 key[POLY1305_KEY_SIZE]; 65 /* calculated Poly1305 tag */ 66 u8 tag[POLY1305_DIGEST_SIZE]; 67 /* length of data to en/decrypt, without ICV */ 68 unsigned int cryptlen; 69 union { 70 struct poly_req poly; 71 struct chacha_req chacha; 72 } u; 73 }; 74 75 static inline void async_done_continue(struct aead_request *req, int err, 76 int (*cont)(struct aead_request *)) 77 { 78 if (!err) 79 err = cont(req); 80 81 if (err != -EINPROGRESS && err != -EBUSY) 82 aead_request_complete(req, err); 83 } 84 85 static void chacha_iv(u8 *iv, struct aead_request *req, u32 icb) 86 { 87 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); 88 __le32 leicb = cpu_to_le32(icb); 89 90 memcpy(iv, &leicb, sizeof(leicb)); 91 memcpy(iv + sizeof(leicb), ctx->salt, ctx->saltlen); 92 memcpy(iv + sizeof(leicb) + ctx->saltlen, req->iv, 93 CHACHA20_IV_SIZE - sizeof(leicb) - ctx->saltlen); 94 } 95 96 static int poly_verify_tag(struct aead_request *req) 97 { 98 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 99 u8 tag[sizeof(rctx->tag)]; 100 101 scatterwalk_map_and_copy(tag, req->src, rctx->cryptlen, sizeof(tag), 0); 102 if (crypto_memneq(tag, rctx->tag, sizeof(tag))) 103 return -EBADMSG; 104 return 0; 105 } 106 107 static int poly_copy_tag(struct aead_request *req) 108 { 109 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 110 111 scatterwalk_map_and_copy(rctx->tag, req->dst, rctx->cryptlen, 112 sizeof(rctx->tag), 1); 113 return 0; 114 } 115 116 static void chacha_decrypt_done(struct crypto_async_request *areq, int err) 117 { 118 async_done_continue(areq->data, err, poly_verify_tag); 119 } 120 121 static int chacha_decrypt(struct aead_request *req) 122 { 123 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); 124 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 125 struct chacha_req *creq = &rctx->u.chacha; 126 int err; 127 128 chacha_iv(creq->iv, req, 1); 129 130 ablkcipher_request_set_callback(&creq->req, aead_request_flags(req), 131 chacha_decrypt_done, req); 132 ablkcipher_request_set_tfm(&creq->req, ctx->chacha); 133 ablkcipher_request_set_crypt(&creq->req, req->src, req->dst, 134 rctx->cryptlen, creq->iv); 135 err = crypto_ablkcipher_decrypt(&creq->req); 136 if (err) 137 return err; 138 139 return poly_verify_tag(req); 140 } 141 142 static int poly_tail_continue(struct aead_request *req) 143 { 144 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 145 146 if (rctx->cryptlen == req->cryptlen) /* encrypting */ 147 return poly_copy_tag(req); 148 149 return chacha_decrypt(req); 150 } 151 152 static void poly_tail_done(struct crypto_async_request *areq, int err) 153 { 154 async_done_continue(areq->data, err, poly_tail_continue); 155 } 156 157 static int poly_tail(struct aead_request *req) 158 { 159 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); 160 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 161 struct poly_req *preq = &rctx->u.poly; 162 __le64 len; 163 int err; 164 165 sg_init_table(preq->src, 1); 166 len = cpu_to_le64(req->assoclen); 167 memcpy(&preq->tail.assoclen, &len, sizeof(len)); 168 len = cpu_to_le64(rctx->cryptlen); 169 memcpy(&preq->tail.cryptlen, &len, sizeof(len)); 170 sg_set_buf(preq->src, &preq->tail, sizeof(preq->tail)); 171 172 ahash_request_set_callback(&preq->req, aead_request_flags(req), 173 poly_tail_done, req); 174 ahash_request_set_tfm(&preq->req, ctx->poly); 175 ahash_request_set_crypt(&preq->req, preq->src, 176 rctx->tag, sizeof(preq->tail)); 177 178 err = crypto_ahash_finup(&preq->req); 179 if (err) 180 return err; 181 182 return poly_tail_continue(req); 183 } 184 185 static void poly_cipherpad_done(struct crypto_async_request *areq, int err) 186 { 187 async_done_continue(areq->data, err, poly_tail); 188 } 189 190 static int poly_cipherpad(struct aead_request *req) 191 { 192 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); 193 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 194 struct poly_req *preq = &rctx->u.poly; 195 unsigned int padlen, bs = POLY1305_BLOCK_SIZE; 196 int err; 197 198 padlen = (bs - (rctx->cryptlen % bs)) % bs; 199 memset(preq->pad, 0, sizeof(preq->pad)); 200 sg_init_table(preq->src, 1); 201 sg_set_buf(preq->src, &preq->pad, padlen); 202 203 ahash_request_set_callback(&preq->req, aead_request_flags(req), 204 poly_cipherpad_done, req); 205 ahash_request_set_tfm(&preq->req, ctx->poly); 206 ahash_request_set_crypt(&preq->req, preq->src, NULL, padlen); 207 208 err = crypto_ahash_update(&preq->req); 209 if (err) 210 return err; 211 212 return poly_tail(req); 213 } 214 215 static void poly_cipher_done(struct crypto_async_request *areq, int err) 216 { 217 async_done_continue(areq->data, err, poly_cipherpad); 218 } 219 220 static int poly_cipher(struct aead_request *req) 221 { 222 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); 223 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 224 struct poly_req *preq = &rctx->u.poly; 225 struct scatterlist *crypt = req->src; 226 int err; 227 228 if (rctx->cryptlen == req->cryptlen) /* encrypting */ 229 crypt = req->dst; 230 231 ahash_request_set_callback(&preq->req, aead_request_flags(req), 232 poly_cipher_done, req); 233 ahash_request_set_tfm(&preq->req, ctx->poly); 234 ahash_request_set_crypt(&preq->req, crypt, NULL, rctx->cryptlen); 235 236 err = crypto_ahash_update(&preq->req); 237 if (err) 238 return err; 239 240 return poly_cipherpad(req); 241 } 242 243 static void poly_adpad_done(struct crypto_async_request *areq, int err) 244 { 245 async_done_continue(areq->data, err, poly_cipher); 246 } 247 248 static int poly_adpad(struct aead_request *req) 249 { 250 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); 251 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 252 struct poly_req *preq = &rctx->u.poly; 253 unsigned int padlen, bs = POLY1305_BLOCK_SIZE; 254 int err; 255 256 padlen = (bs - (req->assoclen % bs)) % bs; 257 memset(preq->pad, 0, sizeof(preq->pad)); 258 sg_init_table(preq->src, 1); 259 sg_set_buf(preq->src, preq->pad, padlen); 260 261 ahash_request_set_callback(&preq->req, aead_request_flags(req), 262 poly_adpad_done, req); 263 ahash_request_set_tfm(&preq->req, ctx->poly); 264 ahash_request_set_crypt(&preq->req, preq->src, NULL, padlen); 265 266 err = crypto_ahash_update(&preq->req); 267 if (err) 268 return err; 269 270 return poly_cipher(req); 271 } 272 273 static void poly_ad_done(struct crypto_async_request *areq, int err) 274 { 275 async_done_continue(areq->data, err, poly_adpad); 276 } 277 278 static int poly_ad(struct aead_request *req) 279 { 280 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); 281 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 282 struct poly_req *preq = &rctx->u.poly; 283 int err; 284 285 ahash_request_set_callback(&preq->req, aead_request_flags(req), 286 poly_ad_done, req); 287 ahash_request_set_tfm(&preq->req, ctx->poly); 288 ahash_request_set_crypt(&preq->req, req->assoc, NULL, req->assoclen); 289 290 err = crypto_ahash_update(&preq->req); 291 if (err) 292 return err; 293 294 return poly_adpad(req); 295 } 296 297 static void poly_setkey_done(struct crypto_async_request *areq, int err) 298 { 299 async_done_continue(areq->data, err, poly_ad); 300 } 301 302 static int poly_setkey(struct aead_request *req) 303 { 304 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); 305 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 306 struct poly_req *preq = &rctx->u.poly; 307 int err; 308 309 sg_init_table(preq->src, 1); 310 sg_set_buf(preq->src, rctx->key, sizeof(rctx->key)); 311 312 ahash_request_set_callback(&preq->req, aead_request_flags(req), 313 poly_setkey_done, req); 314 ahash_request_set_tfm(&preq->req, ctx->poly); 315 ahash_request_set_crypt(&preq->req, preq->src, NULL, sizeof(rctx->key)); 316 317 err = crypto_ahash_update(&preq->req); 318 if (err) 319 return err; 320 321 return poly_ad(req); 322 } 323 324 static void poly_init_done(struct crypto_async_request *areq, int err) 325 { 326 async_done_continue(areq->data, err, poly_setkey); 327 } 328 329 static int poly_init(struct aead_request *req) 330 { 331 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); 332 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 333 struct poly_req *preq = &rctx->u.poly; 334 int err; 335 336 ahash_request_set_callback(&preq->req, aead_request_flags(req), 337 poly_init_done, req); 338 ahash_request_set_tfm(&preq->req, ctx->poly); 339 340 err = crypto_ahash_init(&preq->req); 341 if (err) 342 return err; 343 344 return poly_setkey(req); 345 } 346 347 static void poly_genkey_done(struct crypto_async_request *areq, int err) 348 { 349 async_done_continue(areq->data, err, poly_init); 350 } 351 352 static int poly_genkey(struct aead_request *req) 353 { 354 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); 355 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 356 struct chacha_req *creq = &rctx->u.chacha; 357 int err; 358 359 sg_init_table(creq->src, 1); 360 memset(rctx->key, 0, sizeof(rctx->key)); 361 sg_set_buf(creq->src, rctx->key, sizeof(rctx->key)); 362 363 chacha_iv(creq->iv, req, 0); 364 365 ablkcipher_request_set_callback(&creq->req, aead_request_flags(req), 366 poly_genkey_done, req); 367 ablkcipher_request_set_tfm(&creq->req, ctx->chacha); 368 ablkcipher_request_set_crypt(&creq->req, creq->src, creq->src, 369 POLY1305_KEY_SIZE, creq->iv); 370 371 err = crypto_ablkcipher_decrypt(&creq->req); 372 if (err) 373 return err; 374 375 return poly_init(req); 376 } 377 378 static void chacha_encrypt_done(struct crypto_async_request *areq, int err) 379 { 380 async_done_continue(areq->data, err, poly_genkey); 381 } 382 383 static int chacha_encrypt(struct aead_request *req) 384 { 385 struct chachapoly_ctx *ctx = crypto_aead_ctx(crypto_aead_reqtfm(req)); 386 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 387 struct chacha_req *creq = &rctx->u.chacha; 388 int err; 389 390 chacha_iv(creq->iv, req, 1); 391 392 ablkcipher_request_set_callback(&creq->req, aead_request_flags(req), 393 chacha_encrypt_done, req); 394 ablkcipher_request_set_tfm(&creq->req, ctx->chacha); 395 ablkcipher_request_set_crypt(&creq->req, req->src, req->dst, 396 req->cryptlen, creq->iv); 397 err = crypto_ablkcipher_encrypt(&creq->req); 398 if (err) 399 return err; 400 401 return poly_genkey(req); 402 } 403 404 static int chachapoly_encrypt(struct aead_request *req) 405 { 406 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 407 408 rctx->cryptlen = req->cryptlen; 409 410 /* encrypt call chain: 411 * - chacha_encrypt/done() 412 * - poly_genkey/done() 413 * - poly_init/done() 414 * - poly_setkey/done() 415 * - poly_ad/done() 416 * - poly_adpad/done() 417 * - poly_cipher/done() 418 * - poly_cipherpad/done() 419 * - poly_tail/done/continue() 420 * - poly_copy_tag() 421 */ 422 return chacha_encrypt(req); 423 } 424 425 static int chachapoly_decrypt(struct aead_request *req) 426 { 427 struct chachapoly_req_ctx *rctx = aead_request_ctx(req); 428 429 if (req->cryptlen < POLY1305_DIGEST_SIZE) 430 return -EINVAL; 431 rctx->cryptlen = req->cryptlen - POLY1305_DIGEST_SIZE; 432 433 /* decrypt call chain: 434 * - poly_genkey/done() 435 * - poly_init/done() 436 * - poly_setkey/done() 437 * - poly_ad/done() 438 * - poly_adpad/done() 439 * - poly_cipher/done() 440 * - poly_cipherpad/done() 441 * - poly_tail/done/continue() 442 * - chacha_decrypt/done() 443 * - poly_verify_tag() 444 */ 445 return poly_genkey(req); 446 } 447 448 static int chachapoly_setkey(struct crypto_aead *aead, const u8 *key, 449 unsigned int keylen) 450 { 451 struct chachapoly_ctx *ctx = crypto_aead_ctx(aead); 452 int err; 453 454 if (keylen != ctx->saltlen + CHACHA20_KEY_SIZE) 455 return -EINVAL; 456 457 keylen -= ctx->saltlen; 458 memcpy(ctx->salt, key + keylen, ctx->saltlen); 459 460 crypto_ablkcipher_clear_flags(ctx->chacha, CRYPTO_TFM_REQ_MASK); 461 crypto_ablkcipher_set_flags(ctx->chacha, crypto_aead_get_flags(aead) & 462 CRYPTO_TFM_REQ_MASK); 463 464 err = crypto_ablkcipher_setkey(ctx->chacha, key, keylen); 465 crypto_aead_set_flags(aead, crypto_ablkcipher_get_flags(ctx->chacha) & 466 CRYPTO_TFM_RES_MASK); 467 return err; 468 } 469 470 static int chachapoly_setauthsize(struct crypto_aead *tfm, 471 unsigned int authsize) 472 { 473 if (authsize != POLY1305_DIGEST_SIZE) 474 return -EINVAL; 475 476 return 0; 477 } 478 479 static int chachapoly_init(struct crypto_tfm *tfm) 480 { 481 struct crypto_instance *inst = (void *)tfm->__crt_alg; 482 struct chachapoly_instance_ctx *ictx = crypto_instance_ctx(inst); 483 struct chachapoly_ctx *ctx = crypto_tfm_ctx(tfm); 484 struct crypto_ablkcipher *chacha; 485 struct crypto_ahash *poly; 486 unsigned long align; 487 488 poly = crypto_spawn_ahash(&ictx->poly); 489 if (IS_ERR(poly)) 490 return PTR_ERR(poly); 491 492 chacha = crypto_spawn_skcipher(&ictx->chacha); 493 if (IS_ERR(chacha)) { 494 crypto_free_ahash(poly); 495 return PTR_ERR(chacha); 496 } 497 498 ctx->chacha = chacha; 499 ctx->poly = poly; 500 ctx->saltlen = ictx->saltlen; 501 502 align = crypto_tfm_alg_alignmask(tfm); 503 align &= ~(crypto_tfm_ctx_alignment() - 1); 504 crypto_aead_set_reqsize(__crypto_aead_cast(tfm), 505 align + offsetof(struct chachapoly_req_ctx, u) + 506 max(offsetof(struct chacha_req, req) + 507 sizeof(struct ablkcipher_request) + 508 crypto_ablkcipher_reqsize(chacha), 509 offsetof(struct poly_req, req) + 510 sizeof(struct ahash_request) + 511 crypto_ahash_reqsize(poly))); 512 513 return 0; 514 } 515 516 static void chachapoly_exit(struct crypto_tfm *tfm) 517 { 518 struct chachapoly_ctx *ctx = crypto_tfm_ctx(tfm); 519 520 crypto_free_ahash(ctx->poly); 521 crypto_free_ablkcipher(ctx->chacha); 522 } 523 524 static struct crypto_instance *chachapoly_alloc(struct rtattr **tb, 525 const char *name, 526 unsigned int ivsize) 527 { 528 struct crypto_attr_type *algt; 529 struct crypto_instance *inst; 530 struct crypto_alg *chacha; 531 struct crypto_alg *poly; 532 struct ahash_alg *poly_ahash; 533 struct chachapoly_instance_ctx *ctx; 534 const char *chacha_name, *poly_name; 535 int err; 536 537 if (ivsize > CHACHAPOLY_IV_SIZE) 538 return ERR_PTR(-EINVAL); 539 540 algt = crypto_get_attr_type(tb); 541 if (IS_ERR(algt)) 542 return ERR_CAST(algt); 543 544 if ((algt->type ^ CRYPTO_ALG_TYPE_AEAD) & algt->mask) 545 return ERR_PTR(-EINVAL); 546 547 chacha_name = crypto_attr_alg_name(tb[1]); 548 if (IS_ERR(chacha_name)) 549 return ERR_CAST(chacha_name); 550 poly_name = crypto_attr_alg_name(tb[2]); 551 if (IS_ERR(poly_name)) 552 return ERR_CAST(poly_name); 553 554 poly = crypto_find_alg(poly_name, &crypto_ahash_type, 555 CRYPTO_ALG_TYPE_HASH, 556 CRYPTO_ALG_TYPE_AHASH_MASK); 557 if (IS_ERR(poly)) 558 return ERR_CAST(poly); 559 560 err = -ENOMEM; 561 inst = kzalloc(sizeof(*inst) + sizeof(*ctx), GFP_KERNEL); 562 if (!inst) 563 goto out_put_poly; 564 565 ctx = crypto_instance_ctx(inst); 566 ctx->saltlen = CHACHAPOLY_IV_SIZE - ivsize; 567 poly_ahash = container_of(poly, struct ahash_alg, halg.base); 568 err = crypto_init_ahash_spawn(&ctx->poly, &poly_ahash->halg, inst); 569 if (err) 570 goto err_free_inst; 571 572 crypto_set_skcipher_spawn(&ctx->chacha, inst); 573 err = crypto_grab_skcipher(&ctx->chacha, chacha_name, 0, 574 crypto_requires_sync(algt->type, 575 algt->mask)); 576 if (err) 577 goto err_drop_poly; 578 579 chacha = crypto_skcipher_spawn_alg(&ctx->chacha); 580 581 err = -EINVAL; 582 /* Need 16-byte IV size, including Initial Block Counter value */ 583 if (chacha->cra_ablkcipher.ivsize != CHACHA20_IV_SIZE) 584 goto out_drop_chacha; 585 /* Not a stream cipher? */ 586 if (chacha->cra_blocksize != 1) 587 goto out_drop_chacha; 588 589 err = -ENAMETOOLONG; 590 if (snprintf(inst->alg.cra_name, CRYPTO_MAX_ALG_NAME, 591 "%s(%s,%s)", name, chacha_name, 592 poly_name) >= CRYPTO_MAX_ALG_NAME) 593 goto out_drop_chacha; 594 if (snprintf(inst->alg.cra_driver_name, CRYPTO_MAX_ALG_NAME, 595 "%s(%s,%s)", name, chacha->cra_driver_name, 596 poly->cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 597 goto out_drop_chacha; 598 599 inst->alg.cra_flags = CRYPTO_ALG_TYPE_AEAD; 600 inst->alg.cra_flags |= (chacha->cra_flags | 601 poly->cra_flags) & CRYPTO_ALG_ASYNC; 602 inst->alg.cra_priority = (chacha->cra_priority + 603 poly->cra_priority) / 2; 604 inst->alg.cra_blocksize = 1; 605 inst->alg.cra_alignmask = chacha->cra_alignmask | poly->cra_alignmask; 606 inst->alg.cra_type = &crypto_nivaead_type; 607 inst->alg.cra_aead.ivsize = ivsize; 608 inst->alg.cra_aead.maxauthsize = POLY1305_DIGEST_SIZE; 609 inst->alg.cra_ctxsize = sizeof(struct chachapoly_ctx) + ctx->saltlen; 610 inst->alg.cra_init = chachapoly_init; 611 inst->alg.cra_exit = chachapoly_exit; 612 inst->alg.cra_aead.encrypt = chachapoly_encrypt; 613 inst->alg.cra_aead.decrypt = chachapoly_decrypt; 614 inst->alg.cra_aead.setkey = chachapoly_setkey; 615 inst->alg.cra_aead.setauthsize = chachapoly_setauthsize; 616 inst->alg.cra_aead.geniv = "seqiv"; 617 618 out: 619 crypto_mod_put(poly); 620 return inst; 621 622 out_drop_chacha: 623 crypto_drop_skcipher(&ctx->chacha); 624 err_drop_poly: 625 crypto_drop_ahash(&ctx->poly); 626 err_free_inst: 627 kfree(inst); 628 out_put_poly: 629 inst = ERR_PTR(err); 630 goto out; 631 } 632 633 static struct crypto_instance *rfc7539_alloc(struct rtattr **tb) 634 { 635 return chachapoly_alloc(tb, "rfc7539", 12); 636 } 637 638 static struct crypto_instance *rfc7539esp_alloc(struct rtattr **tb) 639 { 640 return chachapoly_alloc(tb, "rfc7539esp", 8); 641 } 642 643 static void chachapoly_free(struct crypto_instance *inst) 644 { 645 struct chachapoly_instance_ctx *ctx = crypto_instance_ctx(inst); 646 647 crypto_drop_skcipher(&ctx->chacha); 648 crypto_drop_ahash(&ctx->poly); 649 kfree(inst); 650 } 651 652 static struct crypto_template rfc7539_tmpl = { 653 .name = "rfc7539", 654 .alloc = rfc7539_alloc, 655 .free = chachapoly_free, 656 .module = THIS_MODULE, 657 }; 658 659 static struct crypto_template rfc7539esp_tmpl = { 660 .name = "rfc7539esp", 661 .alloc = rfc7539esp_alloc, 662 .free = chachapoly_free, 663 .module = THIS_MODULE, 664 }; 665 666 static int __init chacha20poly1305_module_init(void) 667 { 668 int err; 669 670 err = crypto_register_template(&rfc7539_tmpl); 671 if (err) 672 return err; 673 674 err = crypto_register_template(&rfc7539esp_tmpl); 675 if (err) 676 crypto_unregister_template(&rfc7539_tmpl); 677 678 return err; 679 } 680 681 static void __exit chacha20poly1305_module_exit(void) 682 { 683 crypto_unregister_template(&rfc7539esp_tmpl); 684 crypto_unregister_template(&rfc7539_tmpl); 685 } 686 687 module_init(chacha20poly1305_module_init); 688 module_exit(chacha20poly1305_module_exit); 689 690 MODULE_LICENSE("GPL"); 691 MODULE_AUTHOR("Martin Willi <martin@strongswan.org>"); 692 MODULE_DESCRIPTION("ChaCha20-Poly1305 AEAD"); 693 MODULE_ALIAS_CRYPTO("chacha20poly1305"); 694 MODULE_ALIAS_CRYPTO("rfc7539"); 695 MODULE_ALIAS_CRYPTO("rfc7539esp"); 696