1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873
|
// SPDX-License-Identifier: CDDL-1.0
/*
* CDDL HEADER START
*
* The contents of this file are subject to the terms of the
* Common Development and Distribution License (the "License").
* You may not use this file except in compliance with the License.
*
* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
* or https://opensource.org/licenses/CDDL-1.0.
* See the License for the specific language governing permissions
* and limitations under the License.
*
* When distributing Covered Code, include this CDDL HEADER in each
* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
* If applicable, add the following below this CDDL HEADER, with the
* fields enclosed by brackets "[]" replaced with your own identifying
* information: Portions Copyright [yyyy] [name of copyright owner]
*
* CDDL HEADER END
*/
/*
* Copyright 2010 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#include <sys/zfs_context.h>
#include <sys/crypto/common.h>
#include <sys/crypto/spi.h>
#include <sys/crypto/icp.h>
#include <sys/sha2.h>
#include <sha2/sha2_impl.h>
/*
* Macros to access the SHA2 or SHA2-HMAC contexts from a context passed
* by KCF to one of the entry points.
*/
#define PROV_SHA2_CTX(ctx) ((sha2_ctx_t *)(ctx)->cc_provider_private)
#define PROV_SHA2_HMAC_CTX(ctx) ((sha2_hmac_ctx_t *)(ctx)->cc_provider_private)
/* to extract the digest length passed as mechanism parameter */
#define PROV_SHA2_GET_DIGEST_LEN(m, len) { \
if (IS_P2ALIGNED((m)->cm_param, sizeof (ulong_t))) \
(len) = (uint32_t)*((ulong_t *)(m)->cm_param); \
else { \
ulong_t tmp_ulong; \
memcpy(&tmp_ulong, (m)->cm_param, sizeof (ulong_t)); \
(len) = (uint32_t)tmp_ulong; \
} \
}
#define PROV_SHA2_DIGEST_KEY(mech, ctx, key, len, digest) { \
SHA2Init(mech, ctx); \
SHA2Update(ctx, key, len); \
SHA2Final(digest, ctx); \
}
/*
* Mechanism info structure passed to KCF during registration.
*/
static const crypto_mech_info_t sha2_mech_info_tab[] = {
/* SHA512-HMAC */
{SUN_CKM_SHA512_HMAC, SHA512_HMAC_MECH_INFO_TYPE,
CRYPTO_FG_MAC | CRYPTO_FG_MAC_ATOMIC},
};
static int sha2_mac_init(crypto_ctx_t *, crypto_mechanism_t *, crypto_key_t *,
crypto_spi_ctx_template_t);
static int sha2_mac_update(crypto_ctx_t *, crypto_data_t *);
static int sha2_mac_final(crypto_ctx_t *, crypto_data_t *);
static int sha2_mac_atomic(crypto_mechanism_t *, crypto_key_t *,
crypto_data_t *, crypto_data_t *, crypto_spi_ctx_template_t);
static int sha2_mac_verify_atomic(crypto_mechanism_t *, crypto_key_t *,
crypto_data_t *, crypto_data_t *, crypto_spi_ctx_template_t);
static const crypto_mac_ops_t sha2_mac_ops = {
.mac_init = sha2_mac_init,
.mac = NULL,
.mac_update = sha2_mac_update,
.mac_final = sha2_mac_final,
.mac_atomic = sha2_mac_atomic,
.mac_verify_atomic = sha2_mac_verify_atomic
};
static int sha2_create_ctx_template(crypto_mechanism_t *, crypto_key_t *,
crypto_spi_ctx_template_t *, size_t *);
static int sha2_free_context(crypto_ctx_t *);
static const crypto_ctx_ops_t sha2_ctx_ops = {
.create_ctx_template = sha2_create_ctx_template,
.free_context = sha2_free_context
};
static const crypto_ops_t sha2_crypto_ops = {
NULL,
&sha2_mac_ops,
&sha2_ctx_ops,
};
static const crypto_provider_info_t sha2_prov_info = {
"SHA2 Software Provider",
&sha2_crypto_ops,
sizeof (sha2_mech_info_tab) / sizeof (crypto_mech_info_t),
sha2_mech_info_tab
};
static crypto_kcf_provider_handle_t sha2_prov_handle = 0;
int
sha2_mod_init(void)
{
int ret;
/*
* Register with KCF. If the registration fails, log an
* error but do not uninstall the module, since the functionality
* provided by misc/sha2 should still be available.
*/
if ((ret = crypto_register_provider(&sha2_prov_info,
&sha2_prov_handle)) != CRYPTO_SUCCESS)
cmn_err(CE_WARN, "sha2 _init: "
"crypto_register_provider() failed (0x%x)", ret);
return (0);
}
int
sha2_mod_fini(void)
{
int ret = 0;
if (sha2_prov_handle != 0) {
if ((ret = crypto_unregister_provider(sha2_prov_handle)) !=
CRYPTO_SUCCESS) {
cmn_err(CE_WARN,
"sha2 _fini: crypto_unregister_provider() "
"failed (0x%x)", ret);
return (EBUSY);
}
sha2_prov_handle = 0;
}
return (ret);
}
/*
* Helper SHA2 digest update function for uio data.
*/
static int
sha2_digest_update_uio(SHA2_CTX *sha2_ctx, crypto_data_t *data)
{
off_t offset = data->cd_offset;
size_t length = data->cd_length;
uint_t vec_idx = 0;
size_t cur_len;
/* we support only kernel buffer */
if (zfs_uio_segflg(data->cd_uio) != UIO_SYSSPACE)
return (CRYPTO_ARGUMENTS_BAD);
/*
* Jump to the first iovec containing data to be
* digested.
*/
offset = zfs_uio_index_at_offset(data->cd_uio, offset, &vec_idx);
if (vec_idx == zfs_uio_iovcnt(data->cd_uio)) {
/*
* The caller specified an offset that is larger than the
* total size of the buffers it provided.
*/
return (CRYPTO_DATA_LEN_RANGE);
}
/*
* Now do the digesting on the iovecs.
*/
while (vec_idx < zfs_uio_iovcnt(data->cd_uio) && length > 0) {
cur_len = MIN(zfs_uio_iovlen(data->cd_uio, vec_idx) -
offset, length);
SHA2Update(sha2_ctx, (uint8_t *)zfs_uio_iovbase(data->cd_uio,
vec_idx) + offset, cur_len);
length -= cur_len;
vec_idx++;
offset = 0;
}
if (vec_idx == zfs_uio_iovcnt(data->cd_uio) && length > 0) {
/*
* The end of the specified iovec's was reached but
* the length requested could not be processed, i.e.
* The caller requested to digest more data than it provided.
*/
return (CRYPTO_DATA_LEN_RANGE);
}
return (CRYPTO_SUCCESS);
}
/*
* Helper SHA2 digest final function for uio data.
* digest_len is the length of the desired digest. If digest_len
* is smaller than the default SHA2 digest length, the caller
* must pass a scratch buffer, digest_scratch, which must
* be at least the algorithm's digest length bytes.
*/
static int
sha2_digest_final_uio(SHA2_CTX *sha2_ctx, crypto_data_t *digest,
ulong_t digest_len, uchar_t *digest_scratch)
{
off_t offset = digest->cd_offset;
uint_t vec_idx = 0;
/* we support only kernel buffer */
if (zfs_uio_segflg(digest->cd_uio) != UIO_SYSSPACE)
return (CRYPTO_ARGUMENTS_BAD);
/*
* Jump to the first iovec containing ptr to the digest to
* be returned.
*/
offset = zfs_uio_index_at_offset(digest->cd_uio, offset, &vec_idx);
if (vec_idx == zfs_uio_iovcnt(digest->cd_uio)) {
/*
* The caller specified an offset that is
* larger than the total size of the buffers
* it provided.
*/
return (CRYPTO_DATA_LEN_RANGE);
}
if (offset + digest_len <=
zfs_uio_iovlen(digest->cd_uio, vec_idx)) {
/*
* The computed SHA2 digest will fit in the current
* iovec.
*/
ASSERT3U(sha2_ctx->algotype, ==, SHA512_HMAC_MECH_INFO_TYPE);
if (digest_len != SHA512_DIGEST_LENGTH) {
/*
* The caller requested a short digest. Digest
* into a scratch buffer and return to
* the user only what was requested.
*/
SHA2Final(digest_scratch, sha2_ctx);
memcpy((uchar_t *)
zfs_uio_iovbase(digest->cd_uio, vec_idx) + offset,
digest_scratch, digest_len);
} else {
SHA2Final((uchar_t *)zfs_uio_iovbase(digest->
cd_uio, vec_idx) + offset,
sha2_ctx);
}
} else {
/*
* The computed digest will be crossing one or more iovec's.
* This is bad performance-wise but we need to support it.
* Allocate a small scratch buffer on the stack and
* copy it piece meal to the specified digest iovec's.
*/
uchar_t digest_tmp[SHA512_DIGEST_LENGTH];
off_t scratch_offset = 0;
size_t length = digest_len;
size_t cur_len;
SHA2Final(digest_tmp, sha2_ctx);
while (vec_idx < zfs_uio_iovcnt(digest->cd_uio) && length > 0) {
cur_len =
MIN(zfs_uio_iovlen(digest->cd_uio, vec_idx) -
offset, length);
memcpy(
zfs_uio_iovbase(digest->cd_uio, vec_idx) + offset,
digest_tmp + scratch_offset,
cur_len);
length -= cur_len;
vec_idx++;
scratch_offset += cur_len;
offset = 0;
}
if (vec_idx == zfs_uio_iovcnt(digest->cd_uio) && length > 0) {
/*
* The end of the specified iovec's was reached but
* the length requested could not be processed, i.e.
* The caller requested to digest more data than it
* provided.
*/
return (CRYPTO_DATA_LEN_RANGE);
}
}
return (CRYPTO_SUCCESS);
}
/*
* KCF software provider mac entry points.
*
* SHA2 HMAC is: SHA2(key XOR opad, SHA2(key XOR ipad, text))
*
* Init:
* The initialization routine initializes what we denote
* as the inner and outer contexts by doing
* - for inner context: SHA2(key XOR ipad)
* - for outer context: SHA2(key XOR opad)
*
* Update:
* Each subsequent SHA2 HMAC update will result in an
* update of the inner context with the specified data.
*
* Final:
* The SHA2 HMAC final will do a SHA2 final operation on the
* inner context, and the resulting digest will be used
* as the data for an update on the outer context. Last
* but not least, a SHA2 final on the outer context will
* be performed to obtain the SHA2 HMAC digest to return
* to the user.
*/
/*
* Initialize a SHA2-HMAC context.
*/
static void
sha2_mac_init_ctx(sha2_hmac_ctx_t *ctx, void *keyval, uint_t length_in_bytes)
{
uint64_t ipad[SHA512_HMAC_BLOCK_SIZE / sizeof (uint64_t)] = {0};
uint64_t opad[SHA512_HMAC_BLOCK_SIZE / sizeof (uint64_t)] = {0};
int i, block_size, blocks_per_int64;
/* Determine the block size */
ASSERT3U(ctx->hc_mech_type, ==, SHA512_HMAC_MECH_INFO_TYPE);
block_size = SHA512_HMAC_BLOCK_SIZE;
blocks_per_int64 = SHA512_HMAC_BLOCK_SIZE / sizeof (uint64_t);
(void) memset(ipad, 0, block_size);
(void) memset(opad, 0, block_size);
if (keyval != NULL) {
(void) memcpy(ipad, keyval, length_in_bytes);
(void) memcpy(opad, keyval, length_in_bytes);
} else {
ASSERT0(length_in_bytes);
}
/* XOR key with ipad (0x36) and opad (0x5c) */
for (i = 0; i < blocks_per_int64; i ++) {
ipad[i] ^= 0x3636363636363636;
opad[i] ^= 0x5c5c5c5c5c5c5c5c;
}
/* perform SHA2 on ipad */
SHA2Init(ctx->hc_mech_type, &ctx->hc_icontext);
SHA2Update(&ctx->hc_icontext, (uint8_t *)ipad, block_size);
/* perform SHA2 on opad */
SHA2Init(ctx->hc_mech_type, &ctx->hc_ocontext);
SHA2Update(&ctx->hc_ocontext, (uint8_t *)opad, block_size);
}
/*
*/
static int
sha2_mac_init(crypto_ctx_t *ctx, crypto_mechanism_t *mechanism,
crypto_key_t *key, crypto_spi_ctx_template_t ctx_template)
{
int ret = CRYPTO_SUCCESS;
uint_t keylen_in_bytes = CRYPTO_BITS2BYTES(key->ck_length);
uint_t sha_digest_len, sha_hmac_block_size;
/*
* Set the digest length and block size to values appropriate to the
* mechanism
*/
switch (mechanism->cm_type) {
case SHA512_HMAC_MECH_INFO_TYPE:
sha_digest_len = SHA512_DIGEST_LENGTH;
sha_hmac_block_size = SHA512_HMAC_BLOCK_SIZE;
break;
default:
return (CRYPTO_MECHANISM_INVALID);
}
ctx->cc_provider_private =
kmem_alloc(sizeof (sha2_hmac_ctx_t), KM_SLEEP);
if (ctx->cc_provider_private == NULL)
return (CRYPTO_HOST_MEMORY);
PROV_SHA2_HMAC_CTX(ctx)->hc_mech_type = mechanism->cm_type;
if (ctx_template != NULL) {
/* reuse context template */
memcpy(PROV_SHA2_HMAC_CTX(ctx), ctx_template,
sizeof (sha2_hmac_ctx_t));
} else {
/* no context template, compute context */
if (keylen_in_bytes > sha_hmac_block_size) {
uchar_t digested_key[SHA512_DIGEST_LENGTH];
sha2_hmac_ctx_t *hmac_ctx = ctx->cc_provider_private;
/*
* Hash the passed-in key to get a smaller key.
* The inner context is used since it hasn't been
* initialized yet.
*/
PROV_SHA2_DIGEST_KEY(mechanism->cm_type / 3,
&hmac_ctx->hc_icontext,
key->ck_data, keylen_in_bytes, digested_key);
sha2_mac_init_ctx(PROV_SHA2_HMAC_CTX(ctx),
digested_key, sha_digest_len);
} else {
sha2_mac_init_ctx(PROV_SHA2_HMAC_CTX(ctx),
key->ck_data, keylen_in_bytes);
}
}
if (ret != CRYPTO_SUCCESS) {
memset(ctx->cc_provider_private, 0, sizeof (sha2_hmac_ctx_t));
kmem_free(ctx->cc_provider_private, sizeof (sha2_hmac_ctx_t));
ctx->cc_provider_private = NULL;
}
return (ret);
}
static int
sha2_mac_update(crypto_ctx_t *ctx, crypto_data_t *data)
{
int ret = CRYPTO_SUCCESS;
ASSERT(ctx->cc_provider_private != NULL);
/*
* Do a SHA2 update of the inner context using the specified
* data.
*/
switch (data->cd_format) {
case CRYPTO_DATA_RAW:
SHA2Update(&PROV_SHA2_HMAC_CTX(ctx)->hc_icontext,
(uint8_t *)data->cd_raw.iov_base + data->cd_offset,
data->cd_length);
break;
case CRYPTO_DATA_UIO:
ret = sha2_digest_update_uio(
&PROV_SHA2_HMAC_CTX(ctx)->hc_icontext, data);
break;
default:
ret = CRYPTO_ARGUMENTS_BAD;
}
return (ret);
}
static int
sha2_mac_final(crypto_ctx_t *ctx, crypto_data_t *mac)
{
int ret = CRYPTO_SUCCESS;
uchar_t digest[SHA512_DIGEST_LENGTH];
uint32_t digest_len, sha_digest_len;
ASSERT(ctx->cc_provider_private != NULL);
/* Set the digest lengths to values appropriate to the mechanism */
switch (PROV_SHA2_HMAC_CTX(ctx)->hc_mech_type) {
case SHA512_HMAC_MECH_INFO_TYPE:
sha_digest_len = digest_len = SHA512_DIGEST_LENGTH;
break;
default:
return (CRYPTO_ARGUMENTS_BAD);
}
/*
* We need to just return the length needed to store the output.
* We should not destroy the context for the following cases.
*/
if ((mac->cd_length == 0) || (mac->cd_length < digest_len)) {
mac->cd_length = digest_len;
return (CRYPTO_BUFFER_TOO_SMALL);
}
/*
* Do a SHA2 final on the inner context.
*/
SHA2Final(digest, &PROV_SHA2_HMAC_CTX(ctx)->hc_icontext);
/*
* Do a SHA2 update on the outer context, feeding the inner
* digest as data.
*/
SHA2Update(&PROV_SHA2_HMAC_CTX(ctx)->hc_ocontext, digest,
sha_digest_len);
/*
* Do a SHA2 final on the outer context, storing the computing
* digest in the users buffer.
*/
switch (mac->cd_format) {
case CRYPTO_DATA_RAW:
if (digest_len != sha_digest_len) {
/*
* The caller requested a short digest. Digest
* into a scratch buffer and return to
* the user only what was requested.
*/
SHA2Final(digest,
&PROV_SHA2_HMAC_CTX(ctx)->hc_ocontext);
memcpy((unsigned char *)mac->cd_raw.iov_base +
mac->cd_offset, digest, digest_len);
} else {
SHA2Final((unsigned char *)mac->cd_raw.iov_base +
mac->cd_offset,
&PROV_SHA2_HMAC_CTX(ctx)->hc_ocontext);
}
break;
case CRYPTO_DATA_UIO:
ret = sha2_digest_final_uio(
&PROV_SHA2_HMAC_CTX(ctx)->hc_ocontext, mac,
digest_len, digest);
break;
default:
ret = CRYPTO_ARGUMENTS_BAD;
}
if (ret == CRYPTO_SUCCESS)
mac->cd_length = digest_len;
else
mac->cd_length = 0;
memset(ctx->cc_provider_private, 0, sizeof (sha2_hmac_ctx_t));
kmem_free(ctx->cc_provider_private, sizeof (sha2_hmac_ctx_t));
ctx->cc_provider_private = NULL;
return (ret);
}
#define SHA2_MAC_UPDATE(data, ctx, ret) { \
switch (data->cd_format) { \
case CRYPTO_DATA_RAW: \
SHA2Update(&(ctx).hc_icontext, \
(uint8_t *)data->cd_raw.iov_base + \
data->cd_offset, data->cd_length); \
break; \
case CRYPTO_DATA_UIO: \
ret = sha2_digest_update_uio(&(ctx).hc_icontext, data); \
break; \
default: \
ret = CRYPTO_ARGUMENTS_BAD; \
} \
}
static int
sha2_mac_atomic(crypto_mechanism_t *mechanism,
crypto_key_t *key, crypto_data_t *data, crypto_data_t *mac,
crypto_spi_ctx_template_t ctx_template)
{
int ret = CRYPTO_SUCCESS;
uchar_t digest[SHA512_DIGEST_LENGTH];
sha2_hmac_ctx_t sha2_hmac_ctx;
uint32_t sha_digest_len, digest_len, sha_hmac_block_size;
uint_t keylen_in_bytes = CRYPTO_BITS2BYTES(key->ck_length);
/*
* Set the digest length and block size to values appropriate to the
* mechanism
*/
switch (mechanism->cm_type) {
case SHA512_HMAC_MECH_INFO_TYPE:
sha_digest_len = digest_len = SHA512_DIGEST_LENGTH;
sha_hmac_block_size = SHA512_HMAC_BLOCK_SIZE;
break;
default:
return (CRYPTO_MECHANISM_INVALID);
}
if (ctx_template != NULL) {
/* reuse context template */
memcpy(&sha2_hmac_ctx, ctx_template, sizeof (sha2_hmac_ctx_t));
} else {
sha2_hmac_ctx.hc_mech_type = mechanism->cm_type;
/* no context template, initialize context */
if (keylen_in_bytes > sha_hmac_block_size) {
/*
* Hash the passed-in key to get a smaller key.
* The inner context is used since it hasn't been
* initialized yet.
*/
PROV_SHA2_DIGEST_KEY(mechanism->cm_type / 3,
&sha2_hmac_ctx.hc_icontext,
key->ck_data, keylen_in_bytes, digest);
sha2_mac_init_ctx(&sha2_hmac_ctx, digest,
sha_digest_len);
} else {
sha2_mac_init_ctx(&sha2_hmac_ctx, key->ck_data,
keylen_in_bytes);
}
}
/* do a SHA2 update of the inner context using the specified data */
SHA2_MAC_UPDATE(data, sha2_hmac_ctx, ret);
if (ret != CRYPTO_SUCCESS)
/* the update failed, free context and bail */
goto bail;
/*
* Do a SHA2 final on the inner context.
*/
SHA2Final(digest, &sha2_hmac_ctx.hc_icontext);
/*
* Do an SHA2 update on the outer context, feeding the inner
* digest as data.
*/
ASSERT3U(mechanism->cm_type, ==, SHA512_HMAC_MECH_INFO_TYPE);
SHA2Update(&sha2_hmac_ctx.hc_ocontext, digest, sha_digest_len);
/*
* Do a SHA2 final on the outer context, storing the computed
* digest in the users buffer.
*/
switch (mac->cd_format) {
case CRYPTO_DATA_RAW:
if (digest_len != sha_digest_len) {
/*
* The caller requested a short digest. Digest
* into a scratch buffer and return to
* the user only what was requested.
*/
SHA2Final(digest, &sha2_hmac_ctx.hc_ocontext);
memcpy((unsigned char *)mac->cd_raw.iov_base +
mac->cd_offset, digest, digest_len);
} else {
SHA2Final((unsigned char *)mac->cd_raw.iov_base +
mac->cd_offset, &sha2_hmac_ctx.hc_ocontext);
}
break;
case CRYPTO_DATA_UIO:
ret = sha2_digest_final_uio(&sha2_hmac_ctx.hc_ocontext, mac,
digest_len, digest);
break;
default:
ret = CRYPTO_ARGUMENTS_BAD;
}
if (ret == CRYPTO_SUCCESS) {
mac->cd_length = digest_len;
return (CRYPTO_SUCCESS);
}
bail:
memset(&sha2_hmac_ctx, 0, sizeof (sha2_hmac_ctx_t));
mac->cd_length = 0;
return (ret);
}
static int
sha2_mac_verify_atomic(crypto_mechanism_t *mechanism,
crypto_key_t *key, crypto_data_t *data, crypto_data_t *mac,
crypto_spi_ctx_template_t ctx_template)
{
int ret = CRYPTO_SUCCESS;
uchar_t digest[SHA512_DIGEST_LENGTH];
sha2_hmac_ctx_t sha2_hmac_ctx;
uint32_t sha_digest_len, digest_len, sha_hmac_block_size;
uint_t keylen_in_bytes = CRYPTO_BITS2BYTES(key->ck_length);
/*
* Set the digest length and block size to values appropriate to the
* mechanism
*/
switch (mechanism->cm_type) {
case SHA512_HMAC_MECH_INFO_TYPE:
sha_digest_len = digest_len = SHA512_DIGEST_LENGTH;
sha_hmac_block_size = SHA512_HMAC_BLOCK_SIZE;
break;
default:
return (CRYPTO_MECHANISM_INVALID);
}
if (ctx_template != NULL) {
/* reuse context template */
memcpy(&sha2_hmac_ctx, ctx_template, sizeof (sha2_hmac_ctx_t));
} else {
sha2_hmac_ctx.hc_mech_type = mechanism->cm_type;
/* no context template, initialize context */
if (keylen_in_bytes > sha_hmac_block_size) {
/*
* Hash the passed-in key to get a smaller key.
* The inner context is used since it hasn't been
* initialized yet.
*/
PROV_SHA2_DIGEST_KEY(mechanism->cm_type / 3,
&sha2_hmac_ctx.hc_icontext,
key->ck_data, keylen_in_bytes, digest);
sha2_mac_init_ctx(&sha2_hmac_ctx, digest,
sha_digest_len);
} else {
sha2_mac_init_ctx(&sha2_hmac_ctx, key->ck_data,
keylen_in_bytes);
}
}
if (mac->cd_length != digest_len) {
ret = CRYPTO_INVALID_MAC;
goto bail;
}
/* do a SHA2 update of the inner context using the specified data */
SHA2_MAC_UPDATE(data, sha2_hmac_ctx, ret);
if (ret != CRYPTO_SUCCESS)
/* the update failed, free context and bail */
goto bail;
/* do a SHA2 final on the inner context */
SHA2Final(digest, &sha2_hmac_ctx.hc_icontext);
/*
* Do an SHA2 update on the outer context, feeding the inner
* digest as data.
*/
ASSERT3U(mechanism->cm_type, ==, SHA512_HMAC_MECH_INFO_TYPE);
SHA2Update(&sha2_hmac_ctx.hc_ocontext, digest, sha_digest_len);
/*
* Do a SHA2 final on the outer context, storing the computed
* digest in the users buffer.
*/
SHA2Final(digest, &sha2_hmac_ctx.hc_ocontext);
/*
* Compare the computed digest against the expected digest passed
* as argument.
*/
switch (mac->cd_format) {
case CRYPTO_DATA_RAW:
if (memcmp(digest, (unsigned char *)mac->cd_raw.iov_base +
mac->cd_offset, digest_len) != 0)
ret = CRYPTO_INVALID_MAC;
break;
case CRYPTO_DATA_UIO: {
off_t offset = mac->cd_offset;
uint_t vec_idx = 0;
off_t scratch_offset = 0;
size_t length = digest_len;
size_t cur_len;
/* we support only kernel buffer */
if (zfs_uio_segflg(mac->cd_uio) != UIO_SYSSPACE)
return (CRYPTO_ARGUMENTS_BAD);
/* jump to the first iovec containing the expected digest */
offset = zfs_uio_index_at_offset(mac->cd_uio, offset, &vec_idx);
if (vec_idx == zfs_uio_iovcnt(mac->cd_uio)) {
/*
* The caller specified an offset that is
* larger than the total size of the buffers
* it provided.
*/
ret = CRYPTO_DATA_LEN_RANGE;
break;
}
/* do the comparison of computed digest vs specified one */
while (vec_idx < zfs_uio_iovcnt(mac->cd_uio) && length > 0) {
cur_len = MIN(zfs_uio_iovlen(mac->cd_uio, vec_idx) -
offset, length);
if (memcmp(digest + scratch_offset,
zfs_uio_iovbase(mac->cd_uio, vec_idx) + offset,
cur_len) != 0) {
ret = CRYPTO_INVALID_MAC;
break;
}
length -= cur_len;
vec_idx++;
scratch_offset += cur_len;
offset = 0;
}
break;
}
default:
ret = CRYPTO_ARGUMENTS_BAD;
}
return (ret);
bail:
memset(&sha2_hmac_ctx, 0, sizeof (sha2_hmac_ctx_t));
mac->cd_length = 0;
return (ret);
}
/*
* KCF software provider context management entry points.
*/
static int
sha2_create_ctx_template(crypto_mechanism_t *mechanism, crypto_key_t *key,
crypto_spi_ctx_template_t *ctx_template, size_t *ctx_template_size)
{
sha2_hmac_ctx_t *sha2_hmac_ctx_tmpl;
uint_t keylen_in_bytes = CRYPTO_BITS2BYTES(key->ck_length);
uint32_t sha_digest_len, sha_hmac_block_size;
/*
* Set the digest length and block size to values appropriate to the
* mechanism
*/
switch (mechanism->cm_type) {
case SHA512_HMAC_MECH_INFO_TYPE:
sha_digest_len = SHA512_DIGEST_LENGTH;
sha_hmac_block_size = SHA512_HMAC_BLOCK_SIZE;
break;
default:
return (CRYPTO_MECHANISM_INVALID);
}
/*
* Allocate and initialize SHA2 context.
*/
sha2_hmac_ctx_tmpl = kmem_alloc(sizeof (sha2_hmac_ctx_t), KM_SLEEP);
if (sha2_hmac_ctx_tmpl == NULL)
return (CRYPTO_HOST_MEMORY);
sha2_hmac_ctx_tmpl->hc_mech_type = mechanism->cm_type;
if (keylen_in_bytes > sha_hmac_block_size) {
uchar_t digested_key[SHA512_DIGEST_LENGTH];
/*
* Hash the passed-in key to get a smaller key.
* The inner context is used since it hasn't been
* initialized yet.
*/
PROV_SHA2_DIGEST_KEY(mechanism->cm_type / 3,
&sha2_hmac_ctx_tmpl->hc_icontext,
key->ck_data, keylen_in_bytes, digested_key);
sha2_mac_init_ctx(sha2_hmac_ctx_tmpl, digested_key,
sha_digest_len);
} else {
sha2_mac_init_ctx(sha2_hmac_ctx_tmpl, key->ck_data,
keylen_in_bytes);
}
*ctx_template = (crypto_spi_ctx_template_t)sha2_hmac_ctx_tmpl;
*ctx_template_size = sizeof (sha2_hmac_ctx_t);
return (CRYPTO_SUCCESS);
}
static int
sha2_free_context(crypto_ctx_t *ctx)
{
uint_t ctx_len;
if (ctx->cc_provider_private == NULL)
return (CRYPTO_SUCCESS);
ASSERT3U(PROV_SHA2_CTX(ctx)->sc_mech_type, ==,
SHA512_HMAC_MECH_INFO_TYPE);
ctx_len = sizeof (sha2_hmac_ctx_t);
memset(ctx->cc_provider_private, 0, ctx_len);
kmem_free(ctx->cc_provider_private, ctx_len);
ctx->cc_provider_private = NULL;
return (CRYPTO_SUCCESS);
}
|