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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 | /* Copyright (c) (2010-2012,2014-2023) Apple Inc. All rights reserved. * * corecrypto is licensed under Apple Inc.’s Internal Use License Agreement (which * is contained in the License.txt file distributed with corecrypto) and only to * people who accept that license. IMPORTANT: Any license rights granted to you by * Apple Inc. (if any) are limited to internal use within your organization only on * devices and computers you own or control, for the sole purpose of verifying the * security characteristics and correct functioning of the Apple Software. You may * not, directly or indirectly, redistribute the Apple Software or any portions thereof. */ #ifndef _CORECRYPTO_CCMODE_H_ #define _CORECRYPTO_CCMODE_H_ #include <corecrypto/cc_config.h> #include <corecrypto/cc_priv.h> #include <corecrypto/ccmode_impl.h> #include <corecrypto/ccmode_siv.h> #include <corecrypto/ccmode_siv_hmac.h> CC_PTRCHECK_CAPABLE_HEADER() /* ECB mode. */ /* Declare a ecb key named _name_. Pass the size field of a struct ccmode_ecb for _size_. */ #define ccecb_ctx_decl(_size_, _name_) cc_ctx_decl_vla(ccecb_ctx, _size_, _name_) #define ccecb_ctx_clear(_size_, _name_) cc_clear(_size_, _name_) size_t ccecb_context_size(const struct ccmode_ecb *mode); size_t ccecb_block_size(const struct ccmode_ecb *mode); int ccecb_init(const struct ccmode_ecb *mode, ccecb_ctx *ctx, size_t key_len, const void *cc_sized_by(key_len) key); int ccecb_update(const struct ccmode_ecb *mode, const ccecb_ctx *ctx, size_t nblocks, const void *cc_indexable in, void *cc_indexable out); cc_ptrcheck_unavailable_r(ccecb_one_shot_explicit) int ccecb_one_shot(const struct ccmode_ecb *mode, size_t key_len, const void *cc_sized_by(key_len) key, size_t nblocks, const void *cc_unsafe_indexable in, void *cc_unsafe_indexable out); int ccecb_one_shot_explicit(const struct ccmode_ecb *mode, size_t key_len, size_t block_size, size_t nblocks, const void *cc_sized_by(key_len) key, const void *cc_sized_by(block_size * nblocks) in, void *cc_sized_by(block_size * nblocks) out); /* CBC mode. */ /* Declare a cbc key named _name_. Pass the size field of a struct ccmode_cbc for _size_. */ #define cccbc_ctx_decl(_size_, _name_) cc_ctx_decl_vla(cccbc_ctx, _size_, _name_) #define cccbc_ctx_clear(_size_, _name_) cc_clear(_size_, _name_) /* Declare a cbc iv tweak named _name_. Pass the blocksize field of a struct ccmode_cbc for _size_. */ #define cccbc_iv_decl(_size_, _name_) cc_ctx_decl_vla(cccbc_iv, _size_, _name_) #define cccbc_iv_clear(_size_, _name_) cc_clear(_size_, _name_) /* Actual symmetric algorithm implementation can provide you one of these. Alternatively you can create a ccmode_cbc instance from any ccmode_ecb cipher. To do so, statically initialize a struct ccmode_cbc using the CCMODE_FACTORY_CBC_DECRYPT or CCMODE_FACTORY_CBC_ENCRYPT macros. Alternatively you can dynamically initialize a struct ccmode_cbc ccmode_factory_cbc_decrypt() or ccmode_factory_cbc_encrypt(). */ size_t cccbc_context_size(const struct ccmode_cbc *mode); size_t cccbc_block_size(const struct ccmode_cbc *mode); int cccbc_init(const struct ccmode_cbc *mode, cccbc_ctx *ctx, size_t key_len, const void *cc_sized_by(key_len) key); int cccbc_copy_iv(cccbc_iv *cc_sized_by(len) iv_ctx, const void *cc_sized_by(len) iv, size_t len); int cccbc_clear_iv(cccbc_iv *cc_sized_by(len) iv_ctx, size_t len); cc_ptrcheck_unavailable() // Use cccbc_copy_iv() or cccbc_clear_iv() directly. int cccbc_set_iv(const struct ccmode_cbc *mode, cccbc_iv *iv_ctx, const void *iv); int cccbc_update(const struct ccmode_cbc *mode, const cccbc_ctx *ctx, cccbc_iv *iv, size_t nblocks, const void *cc_indexable in, void *cc_indexable out); cc_ptrcheck_unavailable_r(cccbc_one_shot_explicit) int cccbc_one_shot(const struct ccmode_cbc *mode, size_t key_len, const void *cc_sized_by(key_len) key, const void *iv, size_t nblocks, const void *cc_unsafe_indexable in, void *cc_unsafe_indexable out); int cccbc_one_shot_explicit(const struct ccmode_cbc *mode, size_t key_len, size_t iv_len, size_t block_size, size_t nblocks, const void *cc_sized_by(key_len) key, const void *cc_sized_by(iv_len) iv, const void *cc_sized_by(block_size * nblocks) in, void *cc_sized_by(block_size * nblocks) out); /* CFB mode. */ /* Declare a cfb key named _name_. Pass the size field of a struct ccmode_cfb for _size_. */ #define cccfb_ctx_decl(_size_, _name_) cc_ctx_decl_vla(cccfb_ctx, _size_, _name_) #define cccfb_ctx_clear(_size_, _name_) cc_clear(_size_, _name_) size_t cccfb_context_size(const struct ccmode_cfb *mode); size_t cccfb_block_size(const struct ccmode_cfb *mode); int cccfb_init(const struct ccmode_cfb *mode, cccfb_ctx *ctx, size_t key_len, const void *cc_sized_by(key_len) key, const void *cc_indexable iv); int cccfb_update(const struct ccmode_cfb *mode, cccfb_ctx *ctx, size_t nbytes, const void *cc_sized_by(nbytes) in, void *cc_sized_by(nbytes) out); int cccfb_one_shot(const struct ccmode_cfb *mode, size_t key_len, const void *cc_sized_by(key_len) key, const void *cc_indexable iv, size_t nbytes, const void *cc_sized_by(nbytes) in, void *cc_sized_by(nbytes) out); /* CFB8 mode. */ /* Declare a cfb8 key named _name_. Pass the size field of a struct ccmode_cfb8 for _size_. */ #define cccfb8_ctx_decl(_size_, _name_) cc_ctx_decl_vla(cccfb8_ctx, _size_, _name_) #define cccfb8_ctx_clear(_size_, _name_) cc_clear(_size_, _name_) size_t cccfb8_context_size(const struct ccmode_cfb8 *mode); size_t cccfb8_block_size(const struct ccmode_cfb8 *mode); int cccfb8_init(const struct ccmode_cfb8 *mode, cccfb8_ctx *ctx, size_t key_len, const void *cc_sized_by(key_len) key, const void *cc_indexable iv); int cccfb8_update(const struct ccmode_cfb8 *mode, cccfb8_ctx *ctx, size_t nbytes, const void *cc_sized_by(nbytes) in, void *cc_sized_by(nbytes) out); int cccfb8_one_shot(const struct ccmode_cfb8 *mode, size_t key_len, const void *cc_sized_by(key_len) key, const void *cc_indexable iv, size_t nbytes, const void *cc_sized_by(nbytes) in, void *cc_sized_by(nbytes) out); /* CTR mode. */ /* Declare a ctr key named _name_. Pass the size field of a struct ccmode_ctr for _size_. */ #define ccctr_ctx_decl(_size_, _name_) cc_ctx_decl_vla(ccctr_ctx, _size_, _name_) #define ccctr_ctx_clear(_size_, _name_) cc_clear(_size_, _name_) /* This is Integer Counter Mode: The IV is the initial value of the counter that is incremented by 1 for each new block. Use the mode flags to select if the IV/Counter is stored in big or little endian. */ size_t ccctr_context_size(const struct ccmode_ctr *mode); size_t ccctr_block_size(const struct ccmode_ctr *mode); int ccctr_init(const struct ccmode_ctr *mode, ccctr_ctx *ctx, size_t key_len, const void *cc_sized_by(key_len) key, const void *cc_indexable iv); int ccctr_update(const struct ccmode_ctr *mode, ccctr_ctx *ctx, size_t nbytes, const void *cc_sized_by(nbytes) in, void *cc_sized_by(nbytes) out); int ccctr_one_shot(const struct ccmode_ctr *mode, size_t key_len, const void *cc_sized_by(key_len) key, const void *cc_indexable iv, size_t nbytes, const void *cc_sized_by(nbytes) in, void *cc_sized_by(nbytes) out); /* OFB mode. */ /* Declare a ofb key named _name_. Pass the size field of a struct ccmode_ofb for _size_. */ #define ccofb_ctx_decl(_size_, _name_) cc_ctx_decl_vla(ccofb_ctx, _size_, _name_) #define ccofb_ctx_clear(_size_, _name_) cc_clear(_size_, _name_) size_t ccofb_context_size(const struct ccmode_ofb *mode); size_t ccofb_block_size(const struct ccmode_ofb *mode); int ccofb_init(const struct ccmode_ofb *mode, ccofb_ctx *ctx, size_t key_len, const void *cc_sized_by(key_len) key, const void *cc_indexable iv); int ccofb_update(const struct ccmode_ofb *mode, ccofb_ctx *ctx, size_t nbytes, const void *cc_sized_by(nbytes) in, void *cc_sized_by(nbytes) out); int ccofb_one_shot(const struct ccmode_ofb *mode, size_t key_len, const void *cc_sized_by(key_len) key, const void *cc_indexable iv, size_t nbytes, const void *cc_sized_by(nbytes) in, void *cc_sized_by(nbytes) out); /* XTS mode. */ /* Declare a xts key named _name_. Pass the size field of a struct ccmode_xts for _size_. */ #define ccxts_ctx_decl(_size_, _name_) cc_ctx_decl_vla(ccxts_ctx, _size_, _name_) #define ccxts_ctx_clear(_size_, _name_) cc_clear(_size_, _name_) /* Declare a xts tweak named _name_. Pass the tweak_size field of a struct ccmode_xts for _size_. */ #define ccxts_tweak_decl(_size_, _name_) cc_ctx_decl_vla(ccxts_tweak, _size_, _name_) #define ccxts_tweak_clear(_size_, _name_) cc_clear(_size_, _name_) /* Actual symmetric algorithm implementation can provide you one of these. Alternatively you can create a ccmode_xts instance from any ccmode_ecb cipher. To do so, statically initialize a struct ccmode_xts using the CCMODE_FACTORY_XTS_DECRYPT or CCMODE_FACTORY_XTS_ENCRYPT macros. Alternatively you can dynamically initialize a struct ccmode_xts ccmode_factory_xts_decrypt() or ccmode_factory_xts_encrypt(). */ /* NOTE that xts mode does not do cts padding. It's really an xex mode. If you need cts padding use the ccpad_xts_encrypt and ccpad_xts_decrypt functions. Also note that xts only works for ecb modes with a block_size of 16. */ size_t ccxts_context_size(const struct ccmode_xts *mode); size_t ccxts_block_size(const struct ccmode_xts *mode); /*! @function ccxts_init @abstract Initialize an XTS context. @param mode Descriptor for the mode @param ctx Context for this instance @param key_nbytes Length of the key arguments in bytes @param data_key Key for data encryption @param tweak_key Key for tweak generation @result 0 iff successful. @discussion For security reasons, the two keys must be different. */ int ccxts_init(const struct ccmode_xts *mode, ccxts_ctx *ctx, size_t key_nbytes, const void *cc_sized_by(key_nbytes) data_key, const void *cc_sized_by(key_nbytes) tweak_key); /*! @function ccxts_set_tweak @abstract Initialize the tweak for a sector. @param mode Descriptor for the mode @param ctx Context for this instance @param tweak Context for the tweak for this sector @param iv Data used to generate the tweak @discussion The IV must be exactly one block in length. */ int ccxts_set_tweak(const struct ccmode_xts *mode, ccxts_ctx *ctx, ccxts_tweak *tweak, const void *cc_indexable iv); /*! @function ccxts_update @abstract Encrypt or decrypt data. @param mode Descriptor for the mode @param ctx Context for an instance @param tweak Context for the tweak for this sector @param nblocks Length of the data in blocks @param in Input data @param out Output buffer @result The updated internal buffer of the tweak context. May be ignored. */ void *cc_unsafe_indexable ccxts_update(const struct ccmode_xts *mode, ccxts_ctx *ctx, ccxts_tweak *tweak, size_t nblocks, const void *cc_indexable in, void *cc_indexable out); /*! @function ccxts_one_shot @abstract Encrypt or decrypt data in XTS mode. @param mode Descriptor for the mode @param key_nbytes Length of the key arguments in bytes @param data_key Key for data encryption @param tweak_key Key for tweak generation @param iv Data used to generate the tweak @param nblocks Length of the data in blocks @param in Input data @param out Output buffer @result 0 iff successful. @discussion For security reasons, the two keys must be different. */ int ccxts_one_shot(const struct ccmode_xts *mode, size_t key_nbytes, const void *cc_sized_by(key_nbytes) data_key, const void *cc_sized_by(key_nbytes) tweak_key, const void *cc_unsafe_indexable iv, size_t nblocks, const void *cc_unsafe_indexable in, void *cc_unsafe_indexable out); /* Authenticated cipher modes. */ /* GCM mode. */ /* Declare a gcm key named _name_. Pass the size field of a struct ccmode_gcm for _size_. */ #define ccgcm_ctx_decl(_size_, _name_) cc_ctx_decl_vla(ccgcm_ctx, _size_, _name_) #define ccgcm_ctx_clear(_size_, _name_) cc_clear(_size_, _name_) #define CCGCM_IV_NBYTES 12 #define CCGCM_BLOCK_NBYTES 16 /* (2^32 - 2) blocks */ /* (2^36 - 32) bytes */ /* (2^39 - 256) bits */ /* Exceeding this figure breaks confidentiality and authenticity. */ #define CCGCM_TEXT_MAX_NBYTES ((1ULL << 36) - 32ULL) size_t ccgcm_context_size(const struct ccmode_gcm *mode); size_t ccgcm_block_size(const struct ccmode_gcm *mode); /*! @function ccgcm_init @abstract Initialize a GCM context. @param mode Descriptor for the mode @param ctx Context for this instance @param key_nbytes Length of the key in bytes @param key Key for the underlying blockcipher (AES) @result 0 iff successful. @discussion The correct sequence of calls is: @code ccgcm_init(...) ccgcm_set_iv(...) ccgcm_aad(...) (may be called zero or more times) ccgcm_update(...) (may be called zero or more times) ccgcm_finalize(...) To reuse the context for additional encryptions, follow this sequence: @code ccgcm_reset(...) ccgcm_set_iv(...) ccgcm_aad(...) (may be called zero or more times) ccgcm_update(...) (may be called zero or more times) ccgcm_finalize(...) @warning The key-IV pair must be unique per encryption. The IV must be nonzero in length. @warning It is not permitted to call @p ccgcm_inc_iv after initializing the cipher via the @p ccgcm_init interface. Nonzero is returned in the event of an improper call sequence. @warning This function is not FIPS-compliant. Use @p ccgcm_init_with_iv instead. */ int ccgcm_init(const struct ccmode_gcm *mode, ccgcm_ctx *ctx, size_t key_nbytes, const void *cc_sized_by(key_nbytes) key); /*! @function ccgcm_init_with_iv @abstract Initialize a GCM context to manage IVs internally. @param mode Descriptor for the mode @param ctx Context for this instance @param key_nbytes Length of the key in bytes @param key Key for the underlying blockcipher (AES) @param iv IV for the first encryption @result 0 iff successful. @discussion The correct sequence of calls is: @code ccgcm_init_with_iv(...) ccgcm_aad(...) (may be called zero or more times) ccgcm_update(...) (may be called zero or more times) ccgcm_finalize(...) To reuse the context for additional encryptions, follow this sequence: @code ccgcm_reset(...) ccgcm_inc_iv(...) ccgcm_aad(...) (may be called zero or more times) ccgcm_update(...) (may be called zero or more times) ccgcm_finalize(...) The IV must be exactly 12 bytes in length. Internally, the IV is treated as a four-byte salt followed by an eight-byte counter. This is to match the behavior of certain protocols (e.g. TLS). In the call to @p ccgcm_inc_iv, the counter component will be interpreted as a big-endian, unsigned value and incremented in place. @warning It is not permitted to call @p ccgcm_set_iv after initializing the cipher via the @p ccgcm_init_with_iv interface. Nonzero is returned in the event of an improper call sequence. @warning The security of GCM depends on the uniqueness of key-IV pairs. To avoid key-IV repetition, callers should not initialize multiple contexts with the same key material via the @p ccgcm_init_with_iv interface. */ int ccgcm_init_with_iv(const struct ccmode_gcm *mode, ccgcm_ctx *ctx, size_t key_nbytes, const void *cc_sized_by(key_nbytes) key, const void *cc_unsafe_indexable iv); /*! @function ccgcm_set_iv @abstract Set the IV for encryption. @param mode Descriptor for the mode @param ctx Context for this instance @param iv_nbytes Length of the IV in bytes @param iv Initialization vector @result 0 iff successful. @discussion Set the initialization vector for encryption. @warning The key-IV pair must be unique per encryption. The IV must be nonzero in length. In stateful protocols, if each packet exposes a guaranteed-unique value, it is recommended to format this as a 12-byte value for use as the IV. In stateless protocols, it is recommended to choose a 16-byte value using a cryptographically-secure pseudorandom number generator (e.g. @p ccrng). @warning This function may not be used after initializing the cipher via @p ccgcm_init_with_iv. Nonzero is returned in the event of an improper call sequence. @warning This function is not FIPS-compliant. Use @p ccgcm_init_with_iv instead. */ int ccgcm_set_iv(const struct ccmode_gcm *mode, ccgcm_ctx *ctx, size_t iv_nbytes, const void *cc_sized_by(iv_nbytes) iv); /*! @function ccgcm_set_iv_legacy @abstract Set the IV for encryption. @param mode Descriptor for the mode @param ctx Context for this instance @param iv_nbytes Length of the IV in bytes @param iv Initialization vector @result 0 iff successful. @discussion Identical to @p ccgcm_set_iv except that it allows zero-length IVs. @warning Zero-length IVs nullify the authenticity guarantees of GCM. @warning Do not use this function in new applications. */ int ccgcm_set_iv_legacy(const struct ccmode_gcm *mode, ccgcm_ctx *ctx, size_t iv_nbytes, const void *cc_sized_by(iv_nbytes) iv); /*! @function ccgcm_inc_iv @abstract Increment the IV for another encryption. @param mode Descriptor for the mode @param ctx Context for this instance @param iv Updated initialization vector @result 0 iff successful. @discussion Updates the IV internally for another encryption. Internally, the IV is treated as a four-byte salt followed by an eight-byte counter. This is to match the behavior of certain protocols (e.g. TLS). The counter component is interpreted as a big-endian, unsigned value and incremented in place. The updated IV is copied to @p iv. This is to support protocols that require part of the IV to be specified explicitly in each packet (e.g. TLS). @warning This function may be used only after initializing the cipher via @p ccgcm_init_with_iv. */ int ccgcm_inc_iv(const struct ccmode_gcm *mode, ccgcm_ctx *ctx, void *cc_unsafe_indexable iv); /*! @function ccgcm_aad @abstract Authenticate additional data. @param mode Descriptor for the mode @param ctx Context for this instance @param nbytes Length of the additional data in bytes @param additional_data Additional data to authenticate @result 0 iff successful. @discussion This is typically used to authenticate data that cannot be encrypted (e.g. packet headers). This function may be called zero or more times. */ int ccgcm_aad(const struct ccmode_gcm *mode, ccgcm_ctx *ctx, size_t nbytes, const void *cc_sized_by(nbytes) additional_data); /*! @function ccgcm_gmac @discussion ccgcm_gmac is deprecated. Use the drop-in replacement 'ccgcm_aad' instead. */ int ccgcm_gmac(const struct ccmode_gcm *mode, ccgcm_ctx *ctx, size_t nbytes, const void *cc_sized_by(nbytes) in) cc_deprecate_with_replacement("ccgcm_aad", 13.0, 10.15, 13.0, 6.0, 4.0); /*! @function ccgcm_update @abstract Encrypt or decrypt data. @param mode Descriptor for the mode @param ctx Context for this instance @param nbytes Length of the data in bytes @param in Input plaintext or ciphertext @param out Output ciphertext or plaintext @result 0 iff successful. @discussion In-place processing is supported. This function may be called zero or more times. */ int ccgcm_update(const struct ccmode_gcm *mode, ccgcm_ctx *ctx, size_t nbytes, const void *cc_sized_by(nbytes) in, void *cc_sized_by(nbytes) out); /*! @function ccgcm_finalize @abstract Finish processing and authenticate. @param mode Descriptor for the mode @param ctx Context for this instance @param tag_nbytes Length of the tag in bytes @param tag Authentication tag @result 0 iff successful. @discussion Finish processing a packet and generate the authentication tag. On encryption, @p tag is purely an output parameter. The generated tag is written to @p tag. On decryption, @p tag is both an input and an output parameter. Well-behaved callers should provide the authentication tag generated during encryption. The function will return nonzero if the input tag does not match the generated tag. The generated tag will be written into the @p tag buffer whether authentication succeeds or fails. @warning The generated tag is written to @p tag to support legacy applications that perform authentication manually. Do not follow this usage pattern in new applications. Rely on the function's error code to verify authenticity. */ int ccgcm_finalize(const struct ccmode_gcm *mode, ccgcm_ctx *ctx, size_t tag_nbytes, void *cc_sized_by(tag_nbytes) tag); /*! @function ccgcm_reset @abstract Reset the context for another encryption. @param mode Descriptor for the mode @param ctx Context for this instance @result 0 iff successful. @discussion Refer to @p ccgcm_init for correct usage. */ int ccgcm_reset(const struct ccmode_gcm *mode, ccgcm_ctx *ctx); /*! @function ccgcm_one_shot @abstract Encrypt or decrypt with GCM. @param mode Descriptor for the mode @param key_nbytes Length of the key in bytes @param key Key for the underlying blockcipher (AES) @param iv_nbytes Length of the IV in bytes @param iv Initialization vector @param adata_nbytes Length of the additional data in bytes @param adata Additional data to authenticate @param nbytes Length of the data in bytes @param in Input plaintext or ciphertext @param out Output ciphertext or plaintext @param tag_nbytes Length of the tag in bytes @param tag Authentication tag @result 0 iff successful. @discussion Perform GCM encryption or decryption. @warning The key-IV pair must be unique per encryption. The IV must be nonzero in length. In stateful protocols, if each packet exposes a guaranteed-unique value, it is recommended to format this as a 12-byte value for use as the IV. In stateless protocols, it is recommended to choose a 16-byte value using a cryptographically-secure pseudorandom number generator (e.g. @p ccrng). In-place processing is supported. On encryption, @p tag is purely an output parameter. The generated tag is written to @p tag. On decryption, @p tag is primarily an input parameter. The caller should provide the authentication tag generated during encryption. The function will return nonzero if the input tag does not match the generated tag. @warning To support legacy applications, @p tag is also an output parameter during decryption. The generated tag is written to @p tag. Legacy callers may choose to compare this to the tag generated during encryption. Do not follow this usage pattern in new applications. */ int ccgcm_one_shot(const struct ccmode_gcm *mode, size_t key_nbytes, const void *cc_sized_by(key_nbytes) key, size_t iv_nbytes, const void *cc_sized_by(iv_nbytes) iv, size_t adata_nbytes, const void *cc_sized_by(adata_nbytes) adata, size_t nbytes, const void *cc_sized_by(nbytes) in, void *cc_sized_by(nbytes) out, size_t tag_nbytes, void *cc_sized_by(tag_nbytes) tag); /*! @function ccgcm_one_shot_legacy @abstract Encrypt or decrypt with GCM. @param mode Descriptor for the mode @param key_nbytes Length of the key in bytes @param key Key for the underlying blockcipher (AES) @param iv_nbytes Length of the IV in bytes @param iv Initialization vector @param adata_nbytes Length of the additional data in bytes @param adata Additional data to authenticate @param nbytes Length of the data in bytes @param in Input plaintext or ciphertext @param out Output ciphertext or plaintext @param tag_nbytes Length of the tag in bytes @param tag Authentication tag @result 0 iff successful. @discussion Identical to @p ccgcm_one_shot except that it allows zero-length IVs. @warning Zero-length IVs nullify the authenticity guarantees of GCM. @warning Do not use this function in new applications. */ int ccgcm_one_shot_legacy(const struct ccmode_gcm *mode, size_t key_nbytes, const void *cc_sized_by(key_nbytes) key, size_t iv_nbytes, const void *cc_sized_by(iv_nbytes) iv, size_t adata_nbytes, const void *cc_sized_by(adata_nbytes) adata, size_t nbytes, const void *cc_sized_by(nbytes) in, void *cc_sized_by(nbytes) out, size_t tag_nbytes, void *cc_sized_by(tag_nbytes) tag); /* CCM */ #define CCM_MAX_TAG_SIZE 16 #define ccccm_ctx_decl(_size_, _name_) cc_ctx_decl_vla(ccccm_ctx, _size_, _name_) #define ccccm_ctx_clear(_size_, _name_) cc_clear(_size_, _name_) /* Declare a ccm nonce named _name_. Pass the mode->nonce_ctx_size for _size_. */ #define ccccm_nonce_decl(_size_, _name_) cc_ctx_decl_vla(ccccm_nonce, _size_, _name_) #define ccccm_nonce_clear(_size_, _name_) cc_clear(_size_, _name_) size_t ccccm_context_size(const struct ccmode_ccm *mode); size_t ccccm_block_size(const struct ccmode_ccm *mode); /// Initialize a ccm authenticated encryption/decryption mode /// @param mode mode descriptor /// @param ctx context for this instance /// @param key_len length in bytes of key provided /// @param key bytes defining key int ccccm_init(const struct ccmode_ccm *mode, ccccm_ctx *ctx, size_t key_len, const void *cc_sized_by(key_len) key); /// Set the initialization value/nonce for the ccm authenticated encryption/decryption /// @param mode mode descriptor /// @param ctx context for this ccm instance /// @param nonce_ctx context for this nonce /// @param nonce_len length in bytes of cmac nonce/iv /// @param nonce bytes defining none /// @param mac_size length in bytes of mac tag /// @param auth_len length in bytes of authenticating data /// @param data_len length in bytes of plaintext int ccccm_set_iv(const struct ccmode_ccm *mode, ccccm_ctx *ctx, ccccm_nonce *nonce_ctx, size_t nonce_len, const void *cc_sized_by(nonce_len) nonce, size_t mac_size, size_t auth_len, size_t data_len); /// (Deprecated) Add associated data to the ccm authenticated encryption/decryption /// @param mode mode descriptor /// @param ctx context for this ccm instance /// @param nonce_ctx context for this nonce /// @param nbytes nbytes length in bytes of associated data being provided in this invocation /// @param in authenticated data being provided in this invocation int ccccm_cbcmac(const struct ccmode_ccm *mode, ccccm_ctx *ctx, ccccm_nonce *nonce_ctx, size_t nbytes, const void *cc_sized_by(nbytes) in); ///Add associated data to the ccm authenticated encryption/decryption /// @param mode mode descriptor /// @param ctx context for this ccm instance /// @param nonce_ctx context for this nonce /// @param ad_nbytes nbytes length in bytes of associated data being provided in this invocation /// @param ad authenticated data being provided in this invocation int ccccm_aad(const struct ccmode_ccm *mode, ccccm_ctx *ctx, ccccm_nonce *nonce_ctx, size_t ad_nbytes, const uint8_t *cc_sized_by(ad_nbytes) ad); /// Add plaintext data to the ccm authenticated encryption/decryption /// @param mode mode descriptor /// @param ctx context for this ccm instance /// @param nonce_ctx context for this nonce /// @param nbytes length in bytes of both plaintext and encrypted plaintext /// @param in In encryption mode plaintext data, in decryption mode encrypted plaintext data. /// @param out in encryption mode resulting encrypted plaintext data. In decryption mode resulting plaintext data int ccccm_update(const struct ccmode_ccm *mode, ccccm_ctx *ctx, ccccm_nonce *nonce_ctx, size_t nbytes, const void *cc_sized_by(nbytes) in, void *cc_sized_by(nbytes) out); /// Add plaintext data to the ccm authenticated encryption /// @param mode mode descriptor /// @param ctx context for this ccm instance /// @param nonce_ctx context for this nonce /// @param nbytes length in bytes of both plaintext and encrypted plaintext /// @param plaintext In encryption mode plaintext data, in decryption mode encrypted plaintext data. /// @param encrypted_plaintext in encryption mode resulting encrypted plaintext data. In decryption mode resulting plaintext data int ccccm_encrypt(const struct ccmode_ccm *mode, ccccm_ctx *ctx, ccccm_nonce *nonce_ctx, size_t nbytes, const uint8_t *cc_sized_by(nbytes) plaintext, uint8_t *cc_sized_by(nbytes) encrypted_plaintext); /// Add ciphertext data to the ccm authenticated decryption /// @param mode mode descriptor /// @param ctx context for this ccm instance /// @param nonce_ctx context for this nonce /// @param nbytes length in bytes of both plaintext and encrypted plaintext /// @param encrypted_plaintext In encryption mode plaintext data, in decryption mode encrypted plaintext data. /// @param plaintext in encryption mode resulting encrypted plaintext data. In decryption mode resulting plaintext data int ccccm_decrypt(const struct ccmode_ccm *mode, ccccm_ctx *ctx, ccccm_nonce *nonce_ctx, size_t nbytes, const uint8_t *cc_sized_by(nbytes) encrypted_plaintext, uint8_t *cc_sized_by(nbytes) plaintext); /// (Deprecated) Compute tag for ccm /// @param mode mode descriptor /// @param ctx context for this ccm instance /// @param nonce_ctx context for this nonce /// @param mac tag portion of ciphertext that is computed from ccm MAC. /// @discussion This is being deprecated, as it requires the caller to manually verify that the returned mac tag is correct when decrypting. Please use ccccm_finalize_and_verify instead. int ccccm_finalize(const struct ccmode_ccm *mode, ccccm_ctx *ctx, ccccm_nonce *nonce_ctx, void *cc_indexable mac); /// Ends encryption and computes tag when in encryption mode /// @param mode mode descriptor /// @param ctx context for this ccm instance /// @param nonce_ctx context for this nonce /// @param mac For encryption mode the resulting mac tag portion of the ciphertext is copied to this buffer. For decryption mode, it provides an input of the expected tag in the ciphertext /// @return For decryption returns CCERR_OK if the provided mac matches the computed mac, and otherwise returns CCMODE_INTEGRITY_FAILURE. int ccccm_finalize_and_generate_tag(const struct ccmode_ccm *mode, ccccm_ctx *ctx, ccccm_nonce *nonce_ctx, uint8_t *cc_indexable mac); /// Ends decryption and verifies tag when in decryption mode /// @param mode mode descriptor /// @param ctx context for this ccm instance /// @param nonce_ctx context for this nonce /// @param mac It provides an input of the expected tag in the ciphertext /// @return Returns CCERR_OK if the provided mac matches the computed mac, and otherwise returns CCMODE_INTEGRITY_FAILURE. int ccccm_finalize_and_verify_tag(const struct ccmode_ccm *mode, ccccm_ctx *ctx, ccccm_nonce *nonce_ctx, const uint8_t *cc_indexable mac); /// Resets the state of the encryptor/decryptor, maintaining the key, but clearing the nonce/iv, allowing for a new encryption or decryption /// @param mode mode descriptor /// @param ctx context for this ccm instance /// @param nonce_ctx context for this nonce int ccccm_reset(const struct ccmode_ccm *mode, ccccm_ctx *ctx, ccccm_nonce *nonce_ctx); /// (Deprecated) Encrypts/Decrypts a plaintext/ciphertext using the AEAD CCM mode. /// @param mode mode descriptor /// @param key_len key length in bytes /// @param key buffer holding key /// @param nonce_len nonce length in bytes /// @param nonce buffer holding nonce /// @param nbytes the length of the plaintext and encrypted-plaintext /// @param in buffer holding plaintext in encryption mode, and encrypted plaintext portion of ciphertext in decryption mode /// @param out buffer receiving resulting encrypted plaintext in encryption mode, and resulting plaintext in decryption mode /// @param adata_len length in bytes of associated data /// @param adata authenticated data being provided in this invocation. /// @param mac_size length in bytes of CCM mac tag /// @param mac portion of ciphertext that is computed from ccm MAC. /// @return This is being deprecated, as it requires the caller to manually verify that the returned mac tag is correct when decrypting. Please use ccccm_one_shot_with_verify instead int ccccm_one_shot(const struct ccmode_ccm *mode, size_t key_len, const void *cc_sized_by(key_len) key, size_t nonce_len, const void *cc_sized_by(nonce_len) nonce, size_t nbytes, const void *cc_sized_by(nbytes) in, void *cc_sized_by(nbytes) out, size_t adata_len, const void *cc_sized_by(adata_len) adata, size_t mac_size, void *cc_sized_by(mac_size) mac); /// Encrypts a plaintext using the AEAD CCM mode, and provides corresponding mac tag. The encrypted plaintext and tag together are the AEAD ciphertext /// @param mode mode descriptor /// @param key_nbytes key length in bytes /// @param key buffer holding key /// @param nonce_nbytes nonce length in bytes /// @param nonce buffer holding nonce /// @param nbytes the length of the plaintext and encrypted-plaintext /// @param plaintext buffer holding plaintext in encryption mode, and encrypted plaintext portion of ciphertext in decryption mode /// @param encrypted_plaintext buffer receiving resulting encrypted plaintext in encryption mode /// @param adata_nbytes length in bytes of associated data /// @param adata authenticated data being provided in this invocation. /// @param mac_tag_nbytes length in bytes of CCM mac tag /// @param mac_tag portion of ciphertext that is computed from ccm MAC. /// @return CERR_OK on successful encryption int ccccm_one_shot_encrypt(const struct ccmode_ccm *mode, size_t key_nbytes, const uint8_t *cc_sized_by(key_nbytes) key, size_t nonce_nbytes, const uint8_t *cc_sized_by(nonce_nbytes) nonce, size_t nbytes, const uint8_t *cc_sized_by(nbytes) plaintext, uint8_t *cc_sized_by(nbytes) encrypted_plaintext, size_t adata_nbytes, const uint8_t *cc_sized_by(adata_nbytes) adata, size_t mac_tag_nbytes, uint8_t *cc_sized_by(mac_tag_nbytes) mac_tag); /// Decrypts a ciphertext using the AEAD CCM mode and ensures authenticity of the ciphertext. An AEAD CCM ciphertext consists of encrypted plaintext and mac tag /// @param mode mode descriptor /// @param key_nbytes key length in bytes /// @param key buffer holding key /// @param nonce_nbytes nonce length in bytes /// @param nonce buffer holding nonce /// @param nbytes the length of the plaintext and encrypted-plaintext /// @param encrypted_plaintext buffer holding the encrypted plaintext portion of ciphertext /// @param plaintext buffer receiving resulting plaintext /// @param adata_nbytes length in bytes of associated data /// @param adata authenticated data being provided in this invocation. /// @param mac_tag_nbytes length in bytes of CCM mac tag /// @param mac_tag portion of ciphertext that is computed from ccm MAC. /// @return For decryption returns CCERR_OK if the provided mac matches the computed mac, and otherwise returns CCMODE_INTEGRITY_FAILURE. int ccccm_one_shot_decrypt(const struct ccmode_ccm *mode, size_t key_nbytes, const uint8_t *cc_sized_by(key_nbytes) key, size_t nonce_nbytes, const uint8_t *cc_sized_by(nonce_nbytes) nonce, size_t nbytes, const uint8_t *cc_sized_by(nbytes) encrypted_plaintext, uint8_t *cc_sized_by(nbytes) plaintext, size_t adata_nbytes, const uint8_t *cc_sized_by(adata_nbytes) adata, size_t mac_tag_nbytes, const uint8_t *cc_sized_by(mac_tag_nbytes) mac_tag); /* OMAC mode. */ /* Declare a omac key named _name_. Pass the size field of a struct ccmode_omac for _size_. */ #define ccomac_ctx_decl(_size_, _name_) cc_ctx_decl_vla(ccomac_ctx, _size_, _name_) #define ccomac_ctx_clear(_size_, _name_) cc_clear(_size_, _name_) size_t ccomac_context_size(const struct ccmode_omac *mode); size_t ccomac_block_size(const struct ccmode_omac *mode); int ccomac_init(const struct ccmode_omac *mode, ccomac_ctx *ctx, size_t tweak_len, size_t key_len, const void *cc_sized_by(key_len) key); int ccomac_update(const struct ccmode_omac *mode, ccomac_ctx *ctx, size_t nblocks, const void *tweak, const void *cc_indexable in, void *cc_indexable out); int ccomac_one_shot(const struct ccmode_omac *mode, size_t tweak_len, size_t key_len, const void *cc_sized_by(key_len) key, const void *cc_sized_by(tweak_len) tweak, size_t nblocks, const void *cc_indexable in, void *cc_indexable out); #endif /* _CORECRYPTO_CCMODE_H_ */ |