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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 99 100 101 102 103 104 105 106 107 108 109 110 111 112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 257 258 259 260 261 262 263 264 265 266 267 268 269 270 271 272 273 274 275 276 277 278 279 280 281 282 283 284 285 286 287 288 289 290 291 292 293 294 295 296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369 370 371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 | /* SPDX-License-Identifier: GPL-2.0-only */ /* * linux/arch/arm64/crypto/aes-modes.S - chaining mode wrappers for AES * * Copyright (C) 2013 - 2017 Linaro Ltd <ard.biesheuvel@linaro.org> */ /* included by aes-ce.S and aes-neon.S */ .text .align 4 #ifndef MAX_STRIDE #define MAX_STRIDE 4 #endif #if MAX_STRIDE == 4 #define ST4(x...) x #define ST5(x...) #else #define ST4(x...) #define ST5(x...) x #endif SYM_FUNC_START_LOCAL(aes_encrypt_block4x) encrypt_block4x v0, v1, v2, v3, w3, x2, x8, w7 ret SYM_FUNC_END(aes_encrypt_block4x) SYM_FUNC_START_LOCAL(aes_decrypt_block4x) decrypt_block4x v0, v1, v2, v3, w3, x2, x8, w7 ret SYM_FUNC_END(aes_decrypt_block4x) #if MAX_STRIDE == 5 SYM_FUNC_START_LOCAL(aes_encrypt_block5x) encrypt_block5x v0, v1, v2, v3, v4, w3, x2, x8, w7 ret SYM_FUNC_END(aes_encrypt_block5x) SYM_FUNC_START_LOCAL(aes_decrypt_block5x) decrypt_block5x v0, v1, v2, v3, v4, w3, x2, x8, w7 ret SYM_FUNC_END(aes_decrypt_block5x) #endif /* * aes_ecb_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds, * int blocks) * aes_ecb_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds, * int blocks) */ AES_FUNC_START(aes_ecb_encrypt) stp x29, x30, [sp, #-16]! mov x29, sp enc_prepare w3, x2, x5 .LecbencloopNx: subs w4, w4, #MAX_STRIDE bmi .Lecbenc1x ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */ ST4( bl aes_encrypt_block4x ) ST5( ld1 {v4.16b}, [x1], #16 ) ST5( bl aes_encrypt_block5x ) st1 {v0.16b-v3.16b}, [x0], #64 ST5( st1 {v4.16b}, [x0], #16 ) b .LecbencloopNx .Lecbenc1x: adds w4, w4, #MAX_STRIDE beq .Lecbencout .Lecbencloop: ld1 {v0.16b}, [x1], #16 /* get next pt block */ encrypt_block v0, w3, x2, x5, w6 st1 {v0.16b}, [x0], #16 subs w4, w4, #1 bne .Lecbencloop .Lecbencout: ldp x29, x30, [sp], #16 ret AES_FUNC_END(aes_ecb_encrypt) AES_FUNC_START(aes_ecb_decrypt) stp x29, x30, [sp, #-16]! mov x29, sp dec_prepare w3, x2, x5 .LecbdecloopNx: subs w4, w4, #MAX_STRIDE bmi .Lecbdec1x ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */ ST4( bl aes_decrypt_block4x ) ST5( ld1 {v4.16b}, [x1], #16 ) ST5( bl aes_decrypt_block5x ) st1 {v0.16b-v3.16b}, [x0], #64 ST5( st1 {v4.16b}, [x0], #16 ) b .LecbdecloopNx .Lecbdec1x: adds w4, w4, #MAX_STRIDE beq .Lecbdecout .Lecbdecloop: ld1 {v0.16b}, [x1], #16 /* get next ct block */ decrypt_block v0, w3, x2, x5, w6 st1 {v0.16b}, [x0], #16 subs w4, w4, #1 bne .Lecbdecloop .Lecbdecout: ldp x29, x30, [sp], #16 ret AES_FUNC_END(aes_ecb_decrypt) /* * aes_cbc_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds, * int blocks, u8 iv[]) * aes_cbc_decrypt(u8 out[], u8 const in[], u8 const rk[], int rounds, * int blocks, u8 iv[]) * aes_essiv_cbc_encrypt(u8 out[], u8 const in[], u32 const rk1[], * int rounds, int blocks, u8 iv[], * u32 const rk2[]); * aes_essiv_cbc_decrypt(u8 out[], u8 const in[], u32 const rk1[], * int rounds, int blocks, u8 iv[], * u32 const rk2[]); */ AES_FUNC_START(aes_essiv_cbc_encrypt) ld1 {v4.16b}, [x5] /* get iv */ mov w8, #14 /* AES-256: 14 rounds */ enc_prepare w8, x6, x7 encrypt_block v4, w8, x6, x7, w9 enc_switch_key w3, x2, x6 b .Lcbcencloop4x AES_FUNC_START(aes_cbc_encrypt) ld1 {v4.16b}, [x5] /* get iv */ enc_prepare w3, x2, x6 .Lcbcencloop4x: subs w4, w4, #4 bmi .Lcbcenc1x ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */ eor v0.16b, v0.16b, v4.16b /* ..and xor with iv */ encrypt_block v0, w3, x2, x6, w7 eor v1.16b, v1.16b, v0.16b encrypt_block v1, w3, x2, x6, w7 eor v2.16b, v2.16b, v1.16b encrypt_block v2, w3, x2, x6, w7 eor v3.16b, v3.16b, v2.16b encrypt_block v3, w3, x2, x6, w7 st1 {v0.16b-v3.16b}, [x0], #64 mov v4.16b, v3.16b b .Lcbcencloop4x .Lcbcenc1x: adds w4, w4, #4 beq .Lcbcencout .Lcbcencloop: ld1 {v0.16b}, [x1], #16 /* get next pt block */ eor v4.16b, v4.16b, v0.16b /* ..and xor with iv */ encrypt_block v4, w3, x2, x6, w7 st1 {v4.16b}, [x0], #16 subs w4, w4, #1 bne .Lcbcencloop .Lcbcencout: st1 {v4.16b}, [x5] /* return iv */ ret AES_FUNC_END(aes_cbc_encrypt) AES_FUNC_END(aes_essiv_cbc_encrypt) AES_FUNC_START(aes_essiv_cbc_decrypt) stp x29, x30, [sp, #-16]! mov x29, sp ld1 {cbciv.16b}, [x5] /* get iv */ mov w8, #14 /* AES-256: 14 rounds */ enc_prepare w8, x6, x7 encrypt_block cbciv, w8, x6, x7, w9 b .Lessivcbcdecstart AES_FUNC_START(aes_cbc_decrypt) stp x29, x30, [sp, #-16]! mov x29, sp ld1 {cbciv.16b}, [x5] /* get iv */ .Lessivcbcdecstart: dec_prepare w3, x2, x6 .LcbcdecloopNx: subs w4, w4, #MAX_STRIDE bmi .Lcbcdec1x ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */ #if MAX_STRIDE == 5 ld1 {v4.16b}, [x1], #16 /* get 1 ct block */ mov v5.16b, v0.16b mov v6.16b, v1.16b mov v7.16b, v2.16b bl aes_decrypt_block5x sub x1, x1, #32 eor v0.16b, v0.16b, cbciv.16b eor v1.16b, v1.16b, v5.16b ld1 {v5.16b}, [x1], #16 /* reload 1 ct block */ ld1 {cbciv.16b}, [x1], #16 /* reload 1 ct block */ eor v2.16b, v2.16b, v6.16b eor v3.16b, v3.16b, v7.16b eor v4.16b, v4.16b, v5.16b #else mov v4.16b, v0.16b mov v5.16b, v1.16b mov v6.16b, v2.16b bl aes_decrypt_block4x sub x1, x1, #16 eor v0.16b, v0.16b, cbciv.16b eor v1.16b, v1.16b, v4.16b ld1 {cbciv.16b}, [x1], #16 /* reload 1 ct block */ eor v2.16b, v2.16b, v5.16b eor v3.16b, v3.16b, v6.16b #endif st1 {v0.16b-v3.16b}, [x0], #64 ST5( st1 {v4.16b}, [x0], #16 ) b .LcbcdecloopNx .Lcbcdec1x: adds w4, w4, #MAX_STRIDE beq .Lcbcdecout .Lcbcdecloop: ld1 {v1.16b}, [x1], #16 /* get next ct block */ mov v0.16b, v1.16b /* ...and copy to v0 */ decrypt_block v0, w3, x2, x6, w7 eor v0.16b, v0.16b, cbciv.16b /* xor with iv => pt */ mov cbciv.16b, v1.16b /* ct is next iv */ st1 {v0.16b}, [x0], #16 subs w4, w4, #1 bne .Lcbcdecloop .Lcbcdecout: st1 {cbciv.16b}, [x5] /* return iv */ ldp x29, x30, [sp], #16 ret AES_FUNC_END(aes_cbc_decrypt) AES_FUNC_END(aes_essiv_cbc_decrypt) /* * aes_cbc_cts_encrypt(u8 out[], u8 const in[], u32 const rk[], * int rounds, int bytes, u8 const iv[]) * aes_cbc_cts_decrypt(u8 out[], u8 const in[], u32 const rk[], * int rounds, int bytes, u8 const iv[]) */ AES_FUNC_START(aes_cbc_cts_encrypt) adr_l x8, .Lcts_permute_table sub x4, x4, #16 add x9, x8, #32 add x8, x8, x4 sub x9, x9, x4 ld1 {v3.16b}, [x8] ld1 {v4.16b}, [x9] ld1 {v0.16b}, [x1], x4 /* overlapping loads */ ld1 {v1.16b}, [x1] ld1 {v5.16b}, [x5] /* get iv */ enc_prepare w3, x2, x6 eor v0.16b, v0.16b, v5.16b /* xor with iv */ tbl v1.16b, {v1.16b}, v4.16b encrypt_block v0, w3, x2, x6, w7 eor v1.16b, v1.16b, v0.16b tbl v0.16b, {v0.16b}, v3.16b encrypt_block v1, w3, x2, x6, w7 add x4, x0, x4 st1 {v0.16b}, [x4] /* overlapping stores */ st1 {v1.16b}, [x0] ret AES_FUNC_END(aes_cbc_cts_encrypt) AES_FUNC_START(aes_cbc_cts_decrypt) adr_l x8, .Lcts_permute_table sub x4, x4, #16 add x9, x8, #32 add x8, x8, x4 sub x9, x9, x4 ld1 {v3.16b}, [x8] ld1 {v4.16b}, [x9] ld1 {v0.16b}, [x1], x4 /* overlapping loads */ ld1 {v1.16b}, [x1] ld1 {v5.16b}, [x5] /* get iv */ dec_prepare w3, x2, x6 decrypt_block v0, w3, x2, x6, w7 tbl v2.16b, {v0.16b}, v3.16b eor v2.16b, v2.16b, v1.16b tbx v0.16b, {v1.16b}, v4.16b decrypt_block v0, w3, x2, x6, w7 eor v0.16b, v0.16b, v5.16b /* xor with iv */ add x4, x0, x4 st1 {v2.16b}, [x4] /* overlapping stores */ st1 {v0.16b}, [x0] ret AES_FUNC_END(aes_cbc_cts_decrypt) .section ".rodata", "a" .align 6 .Lcts_permute_table: .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff .byte 0x0, 0x1, 0x2, 0x3, 0x4, 0x5, 0x6, 0x7 .byte 0x8, 0x9, 0xa, 0xb, 0xc, 0xd, 0xe, 0xf .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff .byte 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff, 0xff .previous /* * This macro generates the code for CTR and XCTR mode. */ .macro ctr_encrypt xctr // Arguments OUT .req x0 IN .req x1 KEY .req x2 ROUNDS_W .req w3 BYTES_W .req w4 IV .req x5 BYTE_CTR_W .req w6 // XCTR only // Intermediate values CTR_W .req w11 // XCTR only CTR .req x11 // XCTR only IV_PART .req x12 BLOCKS .req x13 BLOCKS_W .req w13 stp x29, x30, [sp, #-16]! mov x29, sp enc_prepare ROUNDS_W, KEY, IV_PART ld1 {vctr.16b}, [IV] /* * Keep 64 bits of the IV in a register. For CTR mode this lets us * easily increment the IV. For XCTR mode this lets us efficiently XOR * the 64-bit counter with the IV. */ .if \xctr umov IV_PART, vctr.d[0] lsr CTR_W, BYTE_CTR_W, #4 .else umov IV_PART, vctr.d[1] rev IV_PART, IV_PART .endif .LctrloopNx\xctr: add BLOCKS_W, BYTES_W, #15 sub BYTES_W, BYTES_W, #MAX_STRIDE << 4 lsr BLOCKS_W, BLOCKS_W, #4 mov w8, #MAX_STRIDE cmp BLOCKS_W, w8 csel BLOCKS_W, BLOCKS_W, w8, lt /* * Set up the counter values in v0-v{MAX_STRIDE-1}. * * If we are encrypting less than MAX_STRIDE blocks, the tail block * handling code expects the last keystream block to be in * v{MAX_STRIDE-1}. For example: if encrypting two blocks with * MAX_STRIDE=5, then v3 and v4 should have the next two counter blocks. */ .if \xctr add CTR, CTR, BLOCKS .else adds IV_PART, IV_PART, BLOCKS .endif mov v0.16b, vctr.16b mov v1.16b, vctr.16b mov v2.16b, vctr.16b mov v3.16b, vctr.16b ST5( mov v4.16b, vctr.16b ) .if \xctr sub x6, CTR, #MAX_STRIDE - 1 sub x7, CTR, #MAX_STRIDE - 2 sub x8, CTR, #MAX_STRIDE - 3 sub x9, CTR, #MAX_STRIDE - 4 ST5( sub x10, CTR, #MAX_STRIDE - 5 ) eor x6, x6, IV_PART eor x7, x7, IV_PART eor x8, x8, IV_PART eor x9, x9, IV_PART ST5( eor x10, x10, IV_PART ) mov v0.d[0], x6 mov v1.d[0], x7 mov v2.d[0], x8 mov v3.d[0], x9 ST5( mov v4.d[0], x10 ) .else bcs 0f .subsection 1 /* * This subsection handles carries. * * Conditional branching here is allowed with respect to time * invariance since the branches are dependent on the IV instead * of the plaintext or key. This code is rarely executed in * practice anyway. */ /* Apply carry to outgoing counter. */ 0: umov x8, vctr.d[0] rev x8, x8 add x8, x8, #1 rev x8, x8 ins vctr.d[0], x8 /* * Apply carry to counter blocks if needed. * * Since the carry flag was set, we know 0 <= IV_PART < * MAX_STRIDE. Using the value of IV_PART we can determine how * many counter blocks need to be updated. */ cbz IV_PART, 2f adr x16, 1f sub x16, x16, IV_PART, lsl #3 br x16 bti c mov v0.d[0], vctr.d[0] bti c mov v1.d[0], vctr.d[0] bti c mov v2.d[0], vctr.d[0] bti c mov v3.d[0], vctr.d[0] ST5( bti c ) ST5( mov v4.d[0], vctr.d[0] ) 1: b 2f .previous 2: rev x7, IV_PART ins vctr.d[1], x7 sub x7, IV_PART, #MAX_STRIDE - 1 sub x8, IV_PART, #MAX_STRIDE - 2 sub x9, IV_PART, #MAX_STRIDE - 3 rev x7, x7 rev x8, x8 mov v1.d[1], x7 rev x9, x9 ST5( sub x10, IV_PART, #MAX_STRIDE - 4 ) mov v2.d[1], x8 ST5( rev x10, x10 ) mov v3.d[1], x9 ST5( mov v4.d[1], x10 ) .endif /* * If there are at least MAX_STRIDE blocks left, XOR the data with * keystream and store. Otherwise jump to tail handling. */ tbnz BYTES_W, #31, .Lctrtail\xctr ld1 {v5.16b-v7.16b}, [IN], #48 ST4( bl aes_encrypt_block4x ) ST5( bl aes_encrypt_block5x ) eor v0.16b, v5.16b, v0.16b ST4( ld1 {v5.16b}, [IN], #16 ) eor v1.16b, v6.16b, v1.16b ST5( ld1 {v5.16b-v6.16b}, [IN], #32 ) eor v2.16b, v7.16b, v2.16b eor v3.16b, v5.16b, v3.16b ST5( eor v4.16b, v6.16b, v4.16b ) st1 {v0.16b-v3.16b}, [OUT], #64 ST5( st1 {v4.16b}, [OUT], #16 ) cbz BYTES_W, .Lctrout\xctr b .LctrloopNx\xctr .Lctrout\xctr: .if !\xctr st1 {vctr.16b}, [IV] /* return next CTR value */ .endif ldp x29, x30, [sp], #16 ret .Lctrtail\xctr: /* * Handle up to MAX_STRIDE * 16 - 1 bytes of plaintext * * This code expects the last keystream block to be in v{MAX_STRIDE-1}. * For example: if encrypting two blocks with MAX_STRIDE=5, then v3 and * v4 should have the next two counter blocks. * * This allows us to store the ciphertext by writing to overlapping * regions of memory. Any invalid ciphertext blocks get overwritten by * correctly computed blocks. This approach greatly simplifies the * logic for storing the ciphertext. */ mov x16, #16 ands w7, BYTES_W, #0xf csel x13, x7, x16, ne ST5( cmp BYTES_W, #64 - (MAX_STRIDE << 4)) ST5( csel x14, x16, xzr, gt ) cmp BYTES_W, #48 - (MAX_STRIDE << 4) csel x15, x16, xzr, gt cmp BYTES_W, #32 - (MAX_STRIDE << 4) csel x16, x16, xzr, gt cmp BYTES_W, #16 - (MAX_STRIDE << 4) adr_l x9, .Lcts_permute_table add x9, x9, x13 ble .Lctrtail1x\xctr ST5( ld1 {v5.16b}, [IN], x14 ) ld1 {v6.16b}, [IN], x15 ld1 {v7.16b}, [IN], x16 ST4( bl aes_encrypt_block4x ) ST5( bl aes_encrypt_block5x ) ld1 {v8.16b}, [IN], x13 ld1 {v9.16b}, [IN] ld1 {v10.16b}, [x9] ST4( eor v6.16b, v6.16b, v0.16b ) ST4( eor v7.16b, v7.16b, v1.16b ) ST4( tbl v3.16b, {v3.16b}, v10.16b ) ST4( eor v8.16b, v8.16b, v2.16b ) ST4( eor v9.16b, v9.16b, v3.16b ) ST5( eor v5.16b, v5.16b, v0.16b ) ST5( eor v6.16b, v6.16b, v1.16b ) ST5( tbl v4.16b, {v4.16b}, v10.16b ) ST5( eor v7.16b, v7.16b, v2.16b ) ST5( eor v8.16b, v8.16b, v3.16b ) ST5( eor v9.16b, v9.16b, v4.16b ) ST5( st1 {v5.16b}, [OUT], x14 ) st1 {v6.16b}, [OUT], x15 st1 {v7.16b}, [OUT], x16 add x13, x13, OUT st1 {v9.16b}, [x13] // overlapping stores st1 {v8.16b}, [OUT] b .Lctrout\xctr .Lctrtail1x\xctr: /* * Handle <= 16 bytes of plaintext * * This code always reads and writes 16 bytes. To avoid out of bounds * accesses, XCTR and CTR modes must use a temporary buffer when * encrypting/decrypting less than 16 bytes. * * This code is unusual in that it loads the input and stores the output * relative to the end of the buffers rather than relative to the start. * This causes unusual behaviour when encrypting/decrypting less than 16 * bytes; the end of the data is expected to be at the end of the * temporary buffer rather than the start of the data being at the start * of the temporary buffer. */ sub x8, x7, #16 csel x7, x7, x8, eq add IN, IN, x7 add OUT, OUT, x7 ld1 {v5.16b}, [IN] ld1 {v6.16b}, [OUT] ST5( mov v3.16b, v4.16b ) encrypt_block v3, ROUNDS_W, KEY, x8, w7 ld1 {v10.16b-v11.16b}, [x9] tbl v3.16b, {v3.16b}, v10.16b sshr v11.16b, v11.16b, #7 eor v5.16b, v5.16b, v3.16b bif v5.16b, v6.16b, v11.16b st1 {v5.16b}, [OUT] b .Lctrout\xctr // Arguments .unreq OUT .unreq IN .unreq KEY .unreq ROUNDS_W .unreq BYTES_W .unreq IV .unreq BYTE_CTR_W // XCTR only // Intermediate values .unreq CTR_W // XCTR only .unreq CTR // XCTR only .unreq IV_PART .unreq BLOCKS .unreq BLOCKS_W .endm /* * aes_ctr_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds, * int bytes, u8 ctr[]) * * The input and output buffers must always be at least 16 bytes even if * encrypting/decrypting less than 16 bytes. Otherwise out of bounds * accesses will occur. The data to be encrypted/decrypted is expected * to be at the end of this 16-byte temporary buffer rather than the * start. */ AES_FUNC_START(aes_ctr_encrypt) ctr_encrypt 0 AES_FUNC_END(aes_ctr_encrypt) /* * aes_xctr_encrypt(u8 out[], u8 const in[], u8 const rk[], int rounds, * int bytes, u8 const iv[], int byte_ctr) * * The input and output buffers must always be at least 16 bytes even if * encrypting/decrypting less than 16 bytes. Otherwise out of bounds * accesses will occur. The data to be encrypted/decrypted is expected * to be at the end of this 16-byte temporary buffer rather than the * start. */ AES_FUNC_START(aes_xctr_encrypt) ctr_encrypt 1 AES_FUNC_END(aes_xctr_encrypt) /* * aes_xts_encrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds, * int bytes, u8 const rk2[], u8 iv[], int first) * aes_xts_decrypt(u8 out[], u8 const in[], u8 const rk1[], int rounds, * int bytes, u8 const rk2[], u8 iv[], int first) */ .macro next_tweak, out, in, tmp sshr \tmp\().2d, \in\().2d, #63 and \tmp\().16b, \tmp\().16b, xtsmask.16b add \out\().2d, \in\().2d, \in\().2d ext \tmp\().16b, \tmp\().16b, \tmp\().16b, #8 eor \out\().16b, \out\().16b, \tmp\().16b .endm .macro xts_load_mask, tmp movi xtsmask.2s, #0x1 movi \tmp\().2s, #0x87 uzp1 xtsmask.4s, xtsmask.4s, \tmp\().4s .endm AES_FUNC_START(aes_xts_encrypt) stp x29, x30, [sp, #-16]! mov x29, sp ld1 {v4.16b}, [x6] xts_load_mask v8 cbz w7, .Lxtsencnotfirst enc_prepare w3, x5, x8 xts_cts_skip_tw w7, .LxtsencNx encrypt_block v4, w3, x5, x8, w7 /* first tweak */ enc_switch_key w3, x2, x8 b .LxtsencNx .Lxtsencnotfirst: enc_prepare w3, x2, x8 .LxtsencloopNx: next_tweak v4, v4, v8 .LxtsencNx: subs w4, w4, #64 bmi .Lxtsenc1x ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 pt blocks */ next_tweak v5, v4, v8 eor v0.16b, v0.16b, v4.16b next_tweak v6, v5, v8 eor v1.16b, v1.16b, v5.16b eor v2.16b, v2.16b, v6.16b next_tweak v7, v6, v8 eor v3.16b, v3.16b, v7.16b bl aes_encrypt_block4x eor v3.16b, v3.16b, v7.16b eor v0.16b, v0.16b, v4.16b eor v1.16b, v1.16b, v5.16b eor v2.16b, v2.16b, v6.16b st1 {v0.16b-v3.16b}, [x0], #64 mov v4.16b, v7.16b cbz w4, .Lxtsencret xts_reload_mask v8 b .LxtsencloopNx .Lxtsenc1x: adds w4, w4, #64 beq .Lxtsencout subs w4, w4, #16 bmi .LxtsencctsNx .Lxtsencloop: ld1 {v0.16b}, [x1], #16 .Lxtsencctsout: eor v0.16b, v0.16b, v4.16b encrypt_block v0, w3, x2, x8, w7 eor v0.16b, v0.16b, v4.16b cbz w4, .Lxtsencout subs w4, w4, #16 next_tweak v4, v4, v8 bmi .Lxtsenccts st1 {v0.16b}, [x0], #16 b .Lxtsencloop .Lxtsencout: st1 {v0.16b}, [x0] .Lxtsencret: st1 {v4.16b}, [x6] ldp x29, x30, [sp], #16 ret .LxtsencctsNx: mov v0.16b, v3.16b sub x0, x0, #16 .Lxtsenccts: adr_l x8, .Lcts_permute_table add x1, x1, w4, sxtw /* rewind input pointer */ add w4, w4, #16 /* # bytes in final block */ add x9, x8, #32 add x8, x8, x4 sub x9, x9, x4 add x4, x0, x4 /* output address of final block */ ld1 {v1.16b}, [x1] /* load final block */ ld1 {v2.16b}, [x8] ld1 {v3.16b}, [x9] tbl v2.16b, {v0.16b}, v2.16b tbx v0.16b, {v1.16b}, v3.16b st1 {v2.16b}, [x4] /* overlapping stores */ mov w4, wzr b .Lxtsencctsout AES_FUNC_END(aes_xts_encrypt) AES_FUNC_START(aes_xts_decrypt) stp x29, x30, [sp, #-16]! mov x29, sp /* subtract 16 bytes if we are doing CTS */ sub w8, w4, #0x10 tst w4, #0xf csel w4, w4, w8, eq ld1 {v4.16b}, [x6] xts_load_mask v8 xts_cts_skip_tw w7, .Lxtsdecskiptw cbz w7, .Lxtsdecnotfirst enc_prepare w3, x5, x8 encrypt_block v4, w3, x5, x8, w7 /* first tweak */ .Lxtsdecskiptw: dec_prepare w3, x2, x8 b .LxtsdecNx .Lxtsdecnotfirst: dec_prepare w3, x2, x8 .LxtsdecloopNx: next_tweak v4, v4, v8 .LxtsdecNx: subs w4, w4, #64 bmi .Lxtsdec1x ld1 {v0.16b-v3.16b}, [x1], #64 /* get 4 ct blocks */ next_tweak v5, v4, v8 eor v0.16b, v0.16b, v4.16b next_tweak v6, v5, v8 eor v1.16b, v1.16b, v5.16b eor v2.16b, v2.16b, v6.16b next_tweak v7, v6, v8 eor v3.16b, v3.16b, v7.16b bl aes_decrypt_block4x eor v3.16b, v3.16b, v7.16b eor v0.16b, v0.16b, v4.16b eor v1.16b, v1.16b, v5.16b eor v2.16b, v2.16b, v6.16b st1 {v0.16b-v3.16b}, [x0], #64 mov v4.16b, v7.16b cbz w4, .Lxtsdecout xts_reload_mask v8 b .LxtsdecloopNx .Lxtsdec1x: adds w4, w4, #64 beq .Lxtsdecout subs w4, w4, #16 .Lxtsdecloop: ld1 {v0.16b}, [x1], #16 bmi .Lxtsdeccts .Lxtsdecctsout: eor v0.16b, v0.16b, v4.16b decrypt_block v0, w3, x2, x8, w7 eor v0.16b, v0.16b, v4.16b st1 {v0.16b}, [x0], #16 cbz w4, .Lxtsdecout subs w4, w4, #16 next_tweak v4, v4, v8 b .Lxtsdecloop .Lxtsdecout: st1 {v4.16b}, [x6] ldp x29, x30, [sp], #16 ret .Lxtsdeccts: adr_l x8, .Lcts_permute_table add x1, x1, w4, sxtw /* rewind input pointer */ add w4, w4, #16 /* # bytes in final block */ add x9, x8, #32 add x8, x8, x4 sub x9, x9, x4 add x4, x0, x4 /* output address of final block */ next_tweak v5, v4, v8 ld1 {v1.16b}, [x1] /* load final block */ ld1 {v2.16b}, [x8] ld1 {v3.16b}, [x9] eor v0.16b, v0.16b, v5.16b decrypt_block v0, w3, x2, x8, w7 eor v0.16b, v0.16b, v5.16b tbl v2.16b, {v0.16b}, v2.16b tbx v0.16b, {v1.16b}, v3.16b st1 {v2.16b}, [x4] /* overlapping stores */ mov w4, wzr b .Lxtsdecctsout AES_FUNC_END(aes_xts_decrypt) /* * aes_mac_update(u8 const in[], u32 const rk[], int rounds, * int blocks, u8 dg[], int enc_before, int enc_after) */ AES_FUNC_START(aes_mac_update) ld1 {v0.16b}, [x4] /* get dg */ enc_prepare w2, x1, x7 cbz w5, .Lmacloop4x encrypt_block v0, w2, x1, x7, w8 .Lmacloop4x: subs w3, w3, #4 bmi .Lmac1x ld1 {v1.16b-v4.16b}, [x0], #64 /* get next pt block */ eor v0.16b, v0.16b, v1.16b /* ..and xor with dg */ encrypt_block v0, w2, x1, x7, w8 eor v0.16b, v0.16b, v2.16b encrypt_block v0, w2, x1, x7, w8 eor v0.16b, v0.16b, v3.16b encrypt_block v0, w2, x1, x7, w8 eor v0.16b, v0.16b, v4.16b cmp w3, wzr csinv x5, x6, xzr, eq cbz w5, .Lmacout encrypt_block v0, w2, x1, x7, w8 st1 {v0.16b}, [x4] /* return dg */ cond_yield .Lmacout, x7, x8 b .Lmacloop4x .Lmac1x: add w3, w3, #4 .Lmacloop: cbz w3, .Lmacout ld1 {v1.16b}, [x0], #16 /* get next pt block */ eor v0.16b, v0.16b, v1.16b /* ..and xor with dg */ subs w3, w3, #1 csinv x5, x6, xzr, eq cbz w5, .Lmacout .Lmacenc: encrypt_block v0, w2, x1, x7, w8 b .Lmacloop .Lmacout: st1 {v0.16b}, [x4] /* return dg */ mov w0, w3 ret AES_FUNC_END(aes_mac_update) |