1// SPDX-License-Identifier: GPL-2.0-or-later 2/* 3 * CCM: Counter with CBC-MAC 4 * 5 * (C) Copyright IBM Corp. 2007 - Joy Latten <latten@us.ibm.com> 6 */ 7 8#include <crypto/internal/aead.h> 9#include <crypto/internal/cipher.h> 10#include <crypto/internal/hash.h> 11#include <crypto/internal/skcipher.h> 12#include <crypto/scatterwalk.h> 13#include <linux/err.h> 14#include <linux/init.h> 15#include <linux/kernel.h> 16#include <linux/module.h> 17#include <linux/slab.h> 18 19struct ccm_instance_ctx { 20 struct crypto_skcipher_spawn ctr; 21 struct crypto_ahash_spawn mac; 22}; 23 24struct crypto_ccm_ctx { 25 struct crypto_ahash *mac; 26 struct crypto_skcipher *ctr; 27}; 28 29struct crypto_rfc4309_ctx { 30 struct crypto_aead *child; 31 u8 nonce[3]; 32}; 33 34struct crypto_rfc4309_req_ctx { 35 struct scatterlist src[3]; 36 struct scatterlist dst[3]; 37 struct aead_request subreq; 38}; 39 40struct crypto_ccm_req_priv_ctx { 41 u8 odata[16]; 42 u8 idata[16]; 43 u8 auth_tag[16]; 44 u32 flags; 45 struct scatterlist src[3]; 46 struct scatterlist dst[3]; 47 union { 48 struct ahash_request ahreq; 49 struct skcipher_request skreq; 50 }; 51}; 52 53struct cbcmac_tfm_ctx { 54 struct crypto_cipher *child; 55}; 56 57struct cbcmac_desc_ctx { 58 unsigned int len; 59}; 60 61static inline struct crypto_ccm_req_priv_ctx *crypto_ccm_reqctx( 62 struct aead_request *req) 63{ 64 unsigned long align = crypto_aead_alignmask(crypto_aead_reqtfm(req)); 65 66 return (void *)PTR_ALIGN((u8 *)aead_request_ctx(req), align + 1); 67} 68 69static int set_msg_len(u8 *block, unsigned int msglen, int csize) 70{ 71 __be32 data; 72 73 memset(block, 0, csize); 74 block += csize; 75 76 if (csize >= 4) 77 csize = 4; 78 else if (msglen > (1 << (8 * csize))) 79 return -EOVERFLOW; 80 81 data = cpu_to_be32(msglen); 82 memcpy(block - csize, (u8 *)&data + 4 - csize, csize); 83 84 return 0; 85} 86 87static int crypto_ccm_setkey(struct crypto_aead *aead, const u8 *key, 88 unsigned int keylen) 89{ 90 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 91 struct crypto_skcipher *ctr = ctx->ctr; 92 struct crypto_ahash *mac = ctx->mac; 93 int err; 94 95 crypto_skcipher_clear_flags(ctr, CRYPTO_TFM_REQ_MASK); 96 crypto_skcipher_set_flags(ctr, crypto_aead_get_flags(aead) & 97 CRYPTO_TFM_REQ_MASK); 98 err = crypto_skcipher_setkey(ctr, key, keylen); 99 if (err) 100 return err; 101 102 crypto_ahash_clear_flags(mac, CRYPTO_TFM_REQ_MASK); 103 crypto_ahash_set_flags(mac, crypto_aead_get_flags(aead) & 104 CRYPTO_TFM_REQ_MASK); 105 return crypto_ahash_setkey(mac, key, keylen); 106} 107 108static int crypto_ccm_setauthsize(struct crypto_aead *tfm, 109 unsigned int authsize) 110{ 111 switch (authsize) { 112 case 4: 113 case 6: 114 case 8: 115 case 10: 116 case 12: 117 case 14: 118 case 16: 119 break; 120 default: 121 return -EINVAL; 122 } 123 124 return 0; 125} 126 127static int format_input(u8 *info, struct aead_request *req, 128 unsigned int cryptlen) 129{ 130 struct crypto_aead *aead = crypto_aead_reqtfm(req); 131 unsigned int lp = req->iv[0]; 132 unsigned int l = lp + 1; 133 unsigned int m; 134 135 m = crypto_aead_authsize(aead); 136 137 memcpy(info, req->iv, 16); 138 139 /* format control info per RFC 3610 and 140 * NIST Special Publication 800-38C 141 */ 142 *info |= (8 * ((m - 2) / 2)); 143 if (req->assoclen) 144 *info |= 64; 145 146 return set_msg_len(info + 16 - l, cryptlen, l); 147} 148 149static int format_adata(u8 *adata, unsigned int a) 150{ 151 int len = 0; 152 153 /* add control info for associated data 154 * RFC 3610 and NIST Special Publication 800-38C 155 */ 156 if (a < 65280) { 157 *(__be16 *)adata = cpu_to_be16(a); 158 len = 2; 159 } else { 160 *(__be16 *)adata = cpu_to_be16(0xfffe); 161 *(__be32 *)&adata[2] = cpu_to_be32(a); 162 len = 6; 163 } 164 165 return len; 166} 167 168static int crypto_ccm_auth(struct aead_request *req, struct scatterlist *plain, 169 unsigned int cryptlen) 170{ 171 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 172 struct crypto_aead *aead = crypto_aead_reqtfm(req); 173 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 174 struct ahash_request *ahreq = &pctx->ahreq; 175 unsigned int assoclen = req->assoclen; 176 struct scatterlist sg[3]; 177 u8 *odata = pctx->odata; 178 u8 *idata = pctx->idata; 179 int ilen, err; 180 181 /* format control data for input */ 182 err = format_input(odata, req, cryptlen); 183 if (err) 184 goto out; 185 186 sg_init_table(sg, 3); 187 sg_set_buf(&sg[0], odata, 16); 188 189 /* format associated data and compute into mac */ 190 if (assoclen) { 191 ilen = format_adata(idata, assoclen); 192 sg_set_buf(&sg[1], idata, ilen); 193 sg_chain(sg, 3, req->src); 194 } else { 195 ilen = 0; 196 sg_chain(sg, 2, req->src); 197 } 198 199 ahash_request_set_tfm(ahreq, ctx->mac); 200 ahash_request_set_callback(ahreq, pctx->flags, NULL, NULL); 201 ahash_request_set_crypt(ahreq, sg, NULL, assoclen + ilen + 16); 202 err = crypto_ahash_init(ahreq); 203 if (err) 204 goto out; 205 err = crypto_ahash_update(ahreq); 206 if (err) 207 goto out; 208 209 /* we need to pad the MAC input to a round multiple of the block size */ 210 ilen = 16 - (assoclen + ilen) % 16; 211 if (ilen < 16) { 212 memset(idata, 0, ilen); 213 sg_init_table(sg, 2); 214 sg_set_buf(&sg[0], idata, ilen); 215 if (plain) 216 sg_chain(sg, 2, plain); 217 plain = sg; 218 cryptlen += ilen; 219 } 220 221 ahash_request_set_crypt(ahreq, plain, odata, cryptlen); 222 err = crypto_ahash_finup(ahreq); 223out: 224 return err; 225} 226 227static void crypto_ccm_encrypt_done(void *data, int err) 228{ 229 struct aead_request *req = data; 230 struct crypto_aead *aead = crypto_aead_reqtfm(req); 231 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 232 u8 *odata = pctx->odata; 233 234 if (!err) 235 scatterwalk_map_and_copy(odata, req->dst, 236 req->assoclen + req->cryptlen, 237 crypto_aead_authsize(aead), 1); 238 aead_request_complete(req, err); 239} 240 241static inline int crypto_ccm_check_iv(const u8 *iv) 242{ 243 /* 2 <= L <= 8, so 1 <= L' <= 7. */ 244 if (1 > iv[0] || iv[0] > 7) 245 return -EINVAL; 246 247 return 0; 248} 249 250static int crypto_ccm_init_crypt(struct aead_request *req, u8 *tag) 251{ 252 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 253 struct scatterlist *sg; 254 u8 *iv = req->iv; 255 int err; 256 257 err = crypto_ccm_check_iv(iv); 258 if (err) 259 return err; 260 261 pctx->flags = aead_request_flags(req); 262 263 /* Note: rfc 3610 and NIST 800-38C require counter of 264 * zero to encrypt auth tag. 265 */ 266 memset(iv + 15 - iv[0], 0, iv[0] + 1); 267 268 sg_init_table(pctx->src, 3); 269 sg_set_buf(pctx->src, tag, 16); 270 sg = scatterwalk_ffwd(pctx->src + 1, req->src, req->assoclen); 271 if (sg != pctx->src + 1) 272 sg_chain(pctx->src, 2, sg); 273 274 if (req->src != req->dst) { 275 sg_init_table(pctx->dst, 3); 276 sg_set_buf(pctx->dst, tag, 16); 277 sg = scatterwalk_ffwd(pctx->dst + 1, req->dst, req->assoclen); 278 if (sg != pctx->dst + 1) 279 sg_chain(pctx->dst, 2, sg); 280 } 281 282 return 0; 283} 284 285static int crypto_ccm_encrypt(struct aead_request *req) 286{ 287 struct crypto_aead *aead = crypto_aead_reqtfm(req); 288 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 289 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 290 struct skcipher_request *skreq = &pctx->skreq; 291 struct scatterlist *dst; 292 unsigned int cryptlen = req->cryptlen; 293 u8 *odata = pctx->odata; 294 u8 *iv = req->iv; 295 int err; 296 297 err = crypto_ccm_init_crypt(req, odata); 298 if (err) 299 return err; 300 301 err = crypto_ccm_auth(req, sg_next(pctx->src), cryptlen); 302 if (err) 303 return err; 304 305 dst = pctx->src; 306 if (req->src != req->dst) 307 dst = pctx->dst; 308 309 skcipher_request_set_tfm(skreq, ctx->ctr); 310 skcipher_request_set_callback(skreq, pctx->flags, 311 crypto_ccm_encrypt_done, req); 312 skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv); 313 err = crypto_skcipher_encrypt(skreq); 314 if (err) 315 return err; 316 317 /* copy authtag to end of dst */ 318 scatterwalk_map_and_copy(odata, sg_next(dst), cryptlen, 319 crypto_aead_authsize(aead), 1); 320 return err; 321} 322 323static void crypto_ccm_decrypt_done(void *data, int err) 324{ 325 struct aead_request *req = data; 326 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 327 struct crypto_aead *aead = crypto_aead_reqtfm(req); 328 unsigned int authsize = crypto_aead_authsize(aead); 329 unsigned int cryptlen = req->cryptlen - authsize; 330 struct scatterlist *dst; 331 332 pctx->flags = 0; 333 334 dst = sg_next(req->src == req->dst ? pctx->src : pctx->dst); 335 336 if (!err) { 337 err = crypto_ccm_auth(req, dst, cryptlen); 338 if (!err && crypto_memneq(pctx->auth_tag, pctx->odata, authsize)) 339 err = -EBADMSG; 340 } 341 aead_request_complete(req, err); 342} 343 344static int crypto_ccm_decrypt(struct aead_request *req) 345{ 346 struct crypto_aead *aead = crypto_aead_reqtfm(req); 347 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(aead); 348 struct crypto_ccm_req_priv_ctx *pctx = crypto_ccm_reqctx(req); 349 struct skcipher_request *skreq = &pctx->skreq; 350 struct scatterlist *dst; 351 unsigned int authsize = crypto_aead_authsize(aead); 352 unsigned int cryptlen = req->cryptlen; 353 u8 *authtag = pctx->auth_tag; 354 u8 *odata = pctx->odata; 355 u8 *iv = pctx->idata; 356 int err; 357 358 cryptlen -= authsize; 359 360 err = crypto_ccm_init_crypt(req, authtag); 361 if (err) 362 return err; 363 364 scatterwalk_map_and_copy(authtag, sg_next(pctx->src), cryptlen, 365 authsize, 0); 366 367 dst = pctx->src; 368 if (req->src != req->dst) 369 dst = pctx->dst; 370 371 memcpy(iv, req->iv, 16); 372 373 skcipher_request_set_tfm(skreq, ctx->ctr); 374 skcipher_request_set_callback(skreq, pctx->flags, 375 crypto_ccm_decrypt_done, req); 376 skcipher_request_set_crypt(skreq, pctx->src, dst, cryptlen + 16, iv); 377 err = crypto_skcipher_decrypt(skreq); 378 if (err) 379 return err; 380 381 err = crypto_ccm_auth(req, sg_next(dst), cryptlen); 382 if (err) 383 return err; 384 385 /* verify */ 386 if (crypto_memneq(authtag, odata, authsize)) 387 return -EBADMSG; 388 389 return err; 390} 391 392static int crypto_ccm_init_tfm(struct crypto_aead *tfm) 393{ 394 struct aead_instance *inst = aead_alg_instance(tfm); 395 struct ccm_instance_ctx *ictx = aead_instance_ctx(inst); 396 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm); 397 struct crypto_ahash *mac; 398 struct crypto_skcipher *ctr; 399 unsigned long align; 400 int err; 401 402 mac = crypto_spawn_ahash(&ictx->mac); 403 if (IS_ERR(mac)) 404 return PTR_ERR(mac); 405 406 ctr = crypto_spawn_skcipher(&ictx->ctr); 407 err = PTR_ERR(ctr); 408 if (IS_ERR(ctr)) 409 goto err_free_mac; 410 411 ctx->mac = mac; 412 ctx->ctr = ctr; 413 414 align = crypto_aead_alignmask(tfm); 415 align &= ~(crypto_tfm_ctx_alignment() - 1); 416 crypto_aead_set_reqsize( 417 tfm, 418 align + sizeof(struct crypto_ccm_req_priv_ctx) + 419 max(crypto_ahash_reqsize(mac), crypto_skcipher_reqsize(ctr))); 420 421 return 0; 422 423err_free_mac: 424 crypto_free_ahash(mac); 425 return err; 426} 427 428static void crypto_ccm_exit_tfm(struct crypto_aead *tfm) 429{ 430 struct crypto_ccm_ctx *ctx = crypto_aead_ctx(tfm); 431 432 crypto_free_ahash(ctx->mac); 433 crypto_free_skcipher(ctx->ctr); 434} 435 436static void crypto_ccm_free(struct aead_instance *inst) 437{ 438 struct ccm_instance_ctx *ctx = aead_instance_ctx(inst); 439 440 crypto_drop_ahash(&ctx->mac); 441 crypto_drop_skcipher(&ctx->ctr); 442 kfree(inst); 443} 444 445static int crypto_ccm_create_common(struct crypto_template *tmpl, 446 struct rtattr **tb, 447 const char *ctr_name, 448 const char *mac_name) 449{ 450 u32 mask; 451 struct aead_instance *inst; 452 struct ccm_instance_ctx *ictx; 453 struct skcipher_alg *ctr; 454 struct hash_alg_common *mac; 455 int err; 456 457 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask); 458 if (err) 459 return err; 460 461 inst = kzalloc(sizeof(*inst) + sizeof(*ictx), GFP_KERNEL); 462 if (!inst) 463 return -ENOMEM; 464 ictx = aead_instance_ctx(inst); 465 466 err = crypto_grab_ahash(&ictx->mac, aead_crypto_instance(inst), 467 mac_name, 0, mask | CRYPTO_ALG_ASYNC); 468 if (err) 469 goto err_free_inst; 470 mac = crypto_spawn_ahash_alg(&ictx->mac); 471 472 err = -EINVAL; 473 if (strncmp(mac->base.cra_name, "cbcmac(", 7) != 0 || 474 mac->digestsize != 16) 475 goto err_free_inst; 476 477 err = crypto_grab_skcipher(&ictx->ctr, aead_crypto_instance(inst), 478 ctr_name, 0, mask); 479 if (err) 480 goto err_free_inst; 481 ctr = crypto_spawn_skcipher_alg(&ictx->ctr); 482 483 /* The skcipher algorithm must be CTR mode, using 16-byte blocks. */ 484 err = -EINVAL; 485 if (strncmp(ctr->base.cra_name, "ctr(", 4) != 0 || 486 crypto_skcipher_alg_ivsize(ctr) != 16 || 487 ctr->base.cra_blocksize != 1) 488 goto err_free_inst; 489 490 /* ctr and cbcmac must use the same underlying block cipher. */ 491 if (strcmp(ctr->base.cra_name + 4, mac->base.cra_name + 7) != 0) 492 goto err_free_inst; 493 494 err = -ENAMETOOLONG; 495 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, 496 "ccm(%s", ctr->base.cra_name + 4) >= CRYPTO_MAX_ALG_NAME) 497 goto err_free_inst; 498 499 if (snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, 500 "ccm_base(%s,%s)", ctr->base.cra_driver_name, 501 mac->base.cra_driver_name) >= CRYPTO_MAX_ALG_NAME) 502 goto err_free_inst; 503 504 inst->alg.base.cra_priority = (mac->base.cra_priority + 505 ctr->base.cra_priority) / 2; 506 inst->alg.base.cra_blocksize = 1; 507 inst->alg.base.cra_alignmask = mac->base.cra_alignmask | 508 ctr->base.cra_alignmask; 509 inst->alg.ivsize = 16; 510 inst->alg.chunksize = crypto_skcipher_alg_chunksize(ctr); 511 inst->alg.maxauthsize = 16; 512 inst->alg.base.cra_ctxsize = sizeof(struct crypto_ccm_ctx); 513 inst->alg.init = crypto_ccm_init_tfm; 514 inst->alg.exit = crypto_ccm_exit_tfm; 515 inst->alg.setkey = crypto_ccm_setkey; 516 inst->alg.setauthsize = crypto_ccm_setauthsize; 517 inst->alg.encrypt = crypto_ccm_encrypt; 518 inst->alg.decrypt = crypto_ccm_decrypt; 519 520 inst->free = crypto_ccm_free; 521 522 err = aead_register_instance(tmpl, inst); 523 if (err) { 524err_free_inst: 525 crypto_ccm_free(inst); 526 } 527 return err; 528} 529 530static int crypto_ccm_create(struct crypto_template *tmpl, struct rtattr **tb) 531{ 532 const char *cipher_name; 533 char ctr_name[CRYPTO_MAX_ALG_NAME]; 534 char mac_name[CRYPTO_MAX_ALG_NAME]; 535 536 cipher_name = crypto_attr_alg_name(tb[1]); 537 if (IS_ERR(cipher_name)) 538 return PTR_ERR(cipher_name); 539 540 if (snprintf(ctr_name, CRYPTO_MAX_ALG_NAME, "ctr(%s)", 541 cipher_name) >= CRYPTO_MAX_ALG_NAME) 542 return -ENAMETOOLONG; 543 544 if (snprintf(mac_name, CRYPTO_MAX_ALG_NAME, "cbcmac(%s)", 545 cipher_name) >= CRYPTO_MAX_ALG_NAME) 546 return -ENAMETOOLONG; 547 548 return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name); 549} 550 551static int crypto_ccm_base_create(struct crypto_template *tmpl, 552 struct rtattr **tb) 553{ 554 const char *ctr_name; 555 const char *mac_name; 556 557 ctr_name = crypto_attr_alg_name(tb[1]); 558 if (IS_ERR(ctr_name)) 559 return PTR_ERR(ctr_name); 560 561 mac_name = crypto_attr_alg_name(tb[2]); 562 if (IS_ERR(mac_name)) 563 return PTR_ERR(mac_name); 564 565 return crypto_ccm_create_common(tmpl, tb, ctr_name, mac_name); 566} 567 568static int crypto_rfc4309_setkey(struct crypto_aead *parent, const u8 *key, 569 unsigned int keylen) 570{ 571 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent); 572 struct crypto_aead *child = ctx->child; 573 574 if (keylen < 3) 575 return -EINVAL; 576 577 keylen -= 3; 578 memcpy(ctx->nonce, key + keylen, 3); 579 580 crypto_aead_clear_flags(child, CRYPTO_TFM_REQ_MASK); 581 crypto_aead_set_flags(child, crypto_aead_get_flags(parent) & 582 CRYPTO_TFM_REQ_MASK); 583 return crypto_aead_setkey(child, key, keylen); 584} 585 586static int crypto_rfc4309_setauthsize(struct crypto_aead *parent, 587 unsigned int authsize) 588{ 589 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(parent); 590 591 switch (authsize) { 592 case 8: 593 case 12: 594 case 16: 595 break; 596 default: 597 return -EINVAL; 598 } 599 600 return crypto_aead_setauthsize(ctx->child, authsize); 601} 602 603static struct aead_request *crypto_rfc4309_crypt(struct aead_request *req) 604{ 605 struct crypto_rfc4309_req_ctx *rctx = aead_request_ctx(req); 606 struct aead_request *subreq = &rctx->subreq; 607 struct crypto_aead *aead = crypto_aead_reqtfm(req); 608 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(aead); 609 struct crypto_aead *child = ctx->child; 610 struct scatterlist *sg; 611 u8 *iv = PTR_ALIGN((u8 *)(subreq + 1) + crypto_aead_reqsize(child), 612 crypto_aead_alignmask(child) + 1); 613 614 /* L' */ 615 iv[0] = 3; 616 617 memcpy(iv + 1, ctx->nonce, 3); 618 memcpy(iv + 4, req->iv, 8); 619 620 scatterwalk_map_and_copy(iv + 16, req->src, 0, req->assoclen - 8, 0); 621 622 sg_init_table(rctx->src, 3); 623 sg_set_buf(rctx->src, iv + 16, req->assoclen - 8); 624 sg = scatterwalk_ffwd(rctx->src + 1, req->src, req->assoclen); 625 if (sg != rctx->src + 1) 626 sg_chain(rctx->src, 2, sg); 627 628 if (req->src != req->dst) { 629 sg_init_table(rctx->dst, 3); 630 sg_set_buf(rctx->dst, iv + 16, req->assoclen - 8); 631 sg = scatterwalk_ffwd(rctx->dst + 1, req->dst, req->assoclen); 632 if (sg != rctx->dst + 1) 633 sg_chain(rctx->dst, 2, sg); 634 } 635 636 aead_request_set_tfm(subreq, child); 637 aead_request_set_callback(subreq, req->base.flags, req->base.complete, 638 req->base.data); 639 aead_request_set_crypt(subreq, rctx->src, 640 req->src == req->dst ? rctx->src : rctx->dst, 641 req->cryptlen, iv); 642 aead_request_set_ad(subreq, req->assoclen - 8); 643 644 return subreq; 645} 646 647static int crypto_rfc4309_encrypt(struct aead_request *req) 648{ 649 if (req->assoclen != 16 && req->assoclen != 20) 650 return -EINVAL; 651 652 req = crypto_rfc4309_crypt(req); 653 654 return crypto_aead_encrypt(req); 655} 656 657static int crypto_rfc4309_decrypt(struct aead_request *req) 658{ 659 if (req->assoclen != 16 && req->assoclen != 20) 660 return -EINVAL; 661 662 req = crypto_rfc4309_crypt(req); 663 664 return crypto_aead_decrypt(req); 665} 666 667static int crypto_rfc4309_init_tfm(struct crypto_aead *tfm) 668{ 669 struct aead_instance *inst = aead_alg_instance(tfm); 670 struct crypto_aead_spawn *spawn = aead_instance_ctx(inst); 671 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm); 672 struct crypto_aead *aead; 673 unsigned long align; 674 675 aead = crypto_spawn_aead(spawn); 676 if (IS_ERR(aead)) 677 return PTR_ERR(aead); 678 679 ctx->child = aead; 680 681 align = crypto_aead_alignmask(aead); 682 align &= ~(crypto_tfm_ctx_alignment() - 1); 683 crypto_aead_set_reqsize( 684 tfm, 685 sizeof(struct crypto_rfc4309_req_ctx) + 686 ALIGN(crypto_aead_reqsize(aead), crypto_tfm_ctx_alignment()) + 687 align + 32); 688 689 return 0; 690} 691 692static void crypto_rfc4309_exit_tfm(struct crypto_aead *tfm) 693{ 694 struct crypto_rfc4309_ctx *ctx = crypto_aead_ctx(tfm); 695 696 crypto_free_aead(ctx->child); 697} 698 699static void crypto_rfc4309_free(struct aead_instance *inst) 700{ 701 crypto_drop_aead(aead_instance_ctx(inst)); 702 kfree(inst); 703} 704 705static int crypto_rfc4309_create(struct crypto_template *tmpl, 706 struct rtattr **tb) 707{ 708 u32 mask; 709 struct aead_instance *inst; 710 struct crypto_aead_spawn *spawn; 711 struct aead_alg *alg; 712 int err; 713 714 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_AEAD, &mask); 715 if (err) 716 return err; 717 718 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); 719 if (!inst) 720 return -ENOMEM; 721 722 spawn = aead_instance_ctx(inst); 723 err = crypto_grab_aead(spawn, aead_crypto_instance(inst), 724 crypto_attr_alg_name(tb[1]), 0, mask); 725 if (err) 726 goto err_free_inst; 727 728 alg = crypto_spawn_aead_alg(spawn); 729 730 err = -EINVAL; 731 732 /* We only support 16-byte blocks. */ 733 if (crypto_aead_alg_ivsize(alg) != 16) 734 goto err_free_inst; 735 736 /* Not a stream cipher? */ 737 if (alg->base.cra_blocksize != 1) 738 goto err_free_inst; 739 740 err = -ENAMETOOLONG; 741 if (snprintf(inst->alg.base.cra_name, CRYPTO_MAX_ALG_NAME, 742 "rfc4309(%s)", alg->base.cra_name) >= 743 CRYPTO_MAX_ALG_NAME || 744 snprintf(inst->alg.base.cra_driver_name, CRYPTO_MAX_ALG_NAME, 745 "rfc4309(%s)", alg->base.cra_driver_name) >= 746 CRYPTO_MAX_ALG_NAME) 747 goto err_free_inst; 748 749 inst->alg.base.cra_priority = alg->base.cra_priority; 750 inst->alg.base.cra_blocksize = 1; 751 inst->alg.base.cra_alignmask = alg->base.cra_alignmask; 752 753 inst->alg.ivsize = 8; 754 inst->alg.chunksize = crypto_aead_alg_chunksize(alg); 755 inst->alg.maxauthsize = 16; 756 757 inst->alg.base.cra_ctxsize = sizeof(struct crypto_rfc4309_ctx); 758 759 inst->alg.init = crypto_rfc4309_init_tfm; 760 inst->alg.exit = crypto_rfc4309_exit_tfm; 761 762 inst->alg.setkey = crypto_rfc4309_setkey; 763 inst->alg.setauthsize = crypto_rfc4309_setauthsize; 764 inst->alg.encrypt = crypto_rfc4309_encrypt; 765 inst->alg.decrypt = crypto_rfc4309_decrypt; 766 767 inst->free = crypto_rfc4309_free; 768 769 err = aead_register_instance(tmpl, inst); 770 if (err) { 771err_free_inst: 772 crypto_rfc4309_free(inst); 773 } 774 return err; 775} 776 777static int crypto_cbcmac_digest_setkey(struct crypto_shash *parent, 778 const u8 *inkey, unsigned int keylen) 779{ 780 struct cbcmac_tfm_ctx *ctx = crypto_shash_ctx(parent); 781 782 return crypto_cipher_setkey(ctx->child, inkey, keylen); 783} 784 785static int crypto_cbcmac_digest_init(struct shash_desc *pdesc) 786{ 787 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); 788 int bs = crypto_shash_digestsize(pdesc->tfm); 789 u8 *dg = (u8 *)ctx + crypto_shash_descsize(pdesc->tfm) - bs; 790 791 ctx->len = 0; 792 memset(dg, 0, bs); 793 794 return 0; 795} 796 797static int crypto_cbcmac_digest_update(struct shash_desc *pdesc, const u8 *p, 798 unsigned int len) 799{ 800 struct crypto_shash *parent = pdesc->tfm; 801 struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent); 802 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); 803 struct crypto_cipher *tfm = tctx->child; 804 int bs = crypto_shash_digestsize(parent); 805 u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs; 806 807 while (len > 0) { 808 unsigned int l = min(len, bs - ctx->len); 809 810 crypto_xor(dg + ctx->len, p, l); 811 ctx->len +=l; 812 len -= l; 813 p += l; 814 815 if (ctx->len == bs) { 816 crypto_cipher_encrypt_one(tfm, dg, dg); 817 ctx->len = 0; 818 } 819 } 820 821 return 0; 822} 823 824static int crypto_cbcmac_digest_final(struct shash_desc *pdesc, u8 *out) 825{ 826 struct crypto_shash *parent = pdesc->tfm; 827 struct cbcmac_tfm_ctx *tctx = crypto_shash_ctx(parent); 828 struct cbcmac_desc_ctx *ctx = shash_desc_ctx(pdesc); 829 struct crypto_cipher *tfm = tctx->child; 830 int bs = crypto_shash_digestsize(parent); 831 u8 *dg = (u8 *)ctx + crypto_shash_descsize(parent) - bs; 832 833 if (ctx->len) 834 crypto_cipher_encrypt_one(tfm, dg, dg); 835 836 memcpy(out, dg, bs); 837 return 0; 838} 839 840static int cbcmac_init_tfm(struct crypto_tfm *tfm) 841{ 842 struct crypto_cipher *cipher; 843 struct crypto_instance *inst = (void *)tfm->__crt_alg; 844 struct crypto_cipher_spawn *spawn = crypto_instance_ctx(inst); 845 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm); 846 847 cipher = crypto_spawn_cipher(spawn); 848 if (IS_ERR(cipher)) 849 return PTR_ERR(cipher); 850 851 ctx->child = cipher; 852 853 return 0; 854}; 855 856static void cbcmac_exit_tfm(struct crypto_tfm *tfm) 857{ 858 struct cbcmac_tfm_ctx *ctx = crypto_tfm_ctx(tfm); 859 crypto_free_cipher(ctx->child); 860} 861 862static int cbcmac_create(struct crypto_template *tmpl, struct rtattr **tb) 863{ 864 struct shash_instance *inst; 865 struct crypto_cipher_spawn *spawn; 866 struct crypto_alg *alg; 867 u32 mask; 868 int err; 869 870 err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_SHASH, &mask); 871 if (err) 872 return err; 873 874 inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL); 875 if (!inst) 876 return -ENOMEM; 877 spawn = shash_instance_ctx(inst); 878 879 err = crypto_grab_cipher(spawn, shash_crypto_instance(inst), 880 crypto_attr_alg_name(tb[1]), 0, mask); 881 if (err) 882 goto err_free_inst; 883 alg = crypto_spawn_cipher_alg(spawn); 884 885 err = crypto_inst_setname(shash_crypto_instance(inst), tmpl->name, alg); 886 if (err) 887 goto err_free_inst; 888 889 inst->alg.base.cra_priority = alg->cra_priority; 890 inst->alg.base.cra_blocksize = 1; 891 892 inst->alg.digestsize = alg->cra_blocksize; 893 inst->alg.descsize = ALIGN(sizeof(struct cbcmac_desc_ctx), 894 alg->cra_alignmask + 1) + 895 alg->cra_blocksize; 896 897 inst->alg.base.cra_ctxsize = sizeof(struct cbcmac_tfm_ctx); 898 inst->alg.base.cra_init = cbcmac_init_tfm; 899 inst->alg.base.cra_exit = cbcmac_exit_tfm; 900 901 inst->alg.init = crypto_cbcmac_digest_init; 902 inst->alg.update = crypto_cbcmac_digest_update; 903 inst->alg.final = crypto_cbcmac_digest_final; 904 inst->alg.setkey = crypto_cbcmac_digest_setkey; 905 906 inst->free = shash_free_singlespawn_instance; 907 908 err = shash_register_instance(tmpl, inst); 909 if (err) { 910err_free_inst: 911 shash_free_singlespawn_instance(inst); 912 } 913 return err; 914} 915 916static struct crypto_template crypto_ccm_tmpls[] = { 917 { 918 .name = "cbcmac", 919 .create = cbcmac_create, 920 .module = THIS_MODULE, 921 }, { 922 .name = "ccm_base", 923 .create = crypto_ccm_base_create, 924 .module = THIS_MODULE, 925 }, { 926 .name = "ccm", 927 .create = crypto_ccm_create, 928 .module = THIS_MODULE, 929 }, { 930 .name = "rfc4309", 931 .create = crypto_rfc4309_create, 932 .module = THIS_MODULE, 933 }, 934}; 935 936static int __init crypto_ccm_module_init(void) 937{ 938 return crypto_register_templates(crypto_ccm_tmpls, 939 ARRAY_SIZE(crypto_ccm_tmpls)); 940} 941 942static void __exit crypto_ccm_module_exit(void) 943{ 944 crypto_unregister_templates(crypto_ccm_tmpls, 945 ARRAY_SIZE(crypto_ccm_tmpls)); 946} 947 948subsys_initcall(crypto_ccm_module_init); 949module_exit(crypto_ccm_module_exit); 950 951MODULE_LICENSE("GPL"); 952MODULE_DESCRIPTION("Counter with CBC MAC"); 953MODULE_ALIAS_CRYPTO("ccm_base"); 954MODULE_ALIAS_CRYPTO("rfc4309"); 955MODULE_ALIAS_CRYPTO("ccm"); 956MODULE_ALIAS_CRYPTO("cbcmac"); 957MODULE_IMPORT_NS(CRYPTO_INTERNAL); 958