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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 | /* 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) frame_push 0 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: frame_pop ret AES_FUNC_END(aes_ecb_encrypt) AES_FUNC_START(aes_ecb_decrypt) frame_push 0 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: frame_pop 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) 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) ld1 {cbciv.16b}, [x5] /* get iv */ .Lessivcbcdecstart: frame_push 0 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 */ frame_pop 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 frame_push 0 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 frame_pop 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) frame_push 0 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] frame_pop 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) frame_push 0 /* 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] frame_pop 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) |