806 lines
19 KiB
ArmAsm
806 lines
19 KiB
ArmAsm
/*
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* ChaCha/XChaCha NEON helper functions
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*
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* Copyright (C) 2016-2018 Linaro, Ltd. <ard.biesheuvel@linaro.org>
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* Originally based on:
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* ChaCha20 256-bit cipher algorithm, RFC7539, x64 SSSE3 functions
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*
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* Copyright (C) 2015 Martin Willi
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*/
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#include <linux/linkage.h>
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#include <asm/assembler.h>
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#include <asm/cache.h>
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.text
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.align 6
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/*
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* chacha_permute - permute one block
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*
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* Permute one 64-byte block where the state matrix is stored in the four NEON
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* registers v0-v3. It performs matrix operations on four words in parallel,
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* but requires shuffling to rearrange the words after each round.
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*
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* The round count is given in w3.
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*
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* Clobbers: w3, x10, v4, v12
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*/
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SYM_FUNC_START_LOCAL(chacha_permute)
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adr_l x10, ROT8
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ld1 {v12.4s}, [x10]
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.Ldoubleround:
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// x0 += x1, x3 = rotl32(x3 ^ x0, 16)
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add v0.4s, v0.4s, v1.4s
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eor v3.16b, v3.16b, v0.16b
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rev32 v3.8h, v3.8h
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// x2 += x3, x1 = rotl32(x1 ^ x2, 12)
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add v2.4s, v2.4s, v3.4s
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eor v4.16b, v1.16b, v2.16b
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shl v1.4s, v4.4s, #12
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sri v1.4s, v4.4s, #20
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// x0 += x1, x3 = rotl32(x3 ^ x0, 8)
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add v0.4s, v0.4s, v1.4s
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eor v3.16b, v3.16b, v0.16b
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tbl v3.16b, {v3.16b}, v12.16b
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// x2 += x3, x1 = rotl32(x1 ^ x2, 7)
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add v2.4s, v2.4s, v3.4s
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eor v4.16b, v1.16b, v2.16b
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shl v1.4s, v4.4s, #7
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sri v1.4s, v4.4s, #25
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// x1 = shuffle32(x1, MASK(0, 3, 2, 1))
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ext v1.16b, v1.16b, v1.16b, #4
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// x2 = shuffle32(x2, MASK(1, 0, 3, 2))
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ext v2.16b, v2.16b, v2.16b, #8
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// x3 = shuffle32(x3, MASK(2, 1, 0, 3))
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ext v3.16b, v3.16b, v3.16b, #12
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// x0 += x1, x3 = rotl32(x3 ^ x0, 16)
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add v0.4s, v0.4s, v1.4s
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eor v3.16b, v3.16b, v0.16b
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rev32 v3.8h, v3.8h
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// x2 += x3, x1 = rotl32(x1 ^ x2, 12)
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add v2.4s, v2.4s, v3.4s
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eor v4.16b, v1.16b, v2.16b
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shl v1.4s, v4.4s, #12
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sri v1.4s, v4.4s, #20
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// x0 += x1, x3 = rotl32(x3 ^ x0, 8)
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add v0.4s, v0.4s, v1.4s
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eor v3.16b, v3.16b, v0.16b
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tbl v3.16b, {v3.16b}, v12.16b
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// x2 += x3, x1 = rotl32(x1 ^ x2, 7)
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add v2.4s, v2.4s, v3.4s
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eor v4.16b, v1.16b, v2.16b
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shl v1.4s, v4.4s, #7
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sri v1.4s, v4.4s, #25
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// x1 = shuffle32(x1, MASK(2, 1, 0, 3))
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ext v1.16b, v1.16b, v1.16b, #12
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// x2 = shuffle32(x2, MASK(1, 0, 3, 2))
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ext v2.16b, v2.16b, v2.16b, #8
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// x3 = shuffle32(x3, MASK(0, 3, 2, 1))
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ext v3.16b, v3.16b, v3.16b, #4
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subs w3, w3, #2
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b.ne .Ldoubleround
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ret
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SYM_FUNC_END(chacha_permute)
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SYM_FUNC_START(chacha_block_xor_neon)
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// x0: Input state matrix, s
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// x1: 1 data block output, o
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// x2: 1 data block input, i
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// w3: nrounds
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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// x0..3 = s0..3
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ld1 {v0.4s-v3.4s}, [x0]
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ld1 {v8.4s-v11.4s}, [x0]
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bl chacha_permute
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ld1 {v4.16b-v7.16b}, [x2]
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// o0 = i0 ^ (x0 + s0)
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add v0.4s, v0.4s, v8.4s
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eor v0.16b, v0.16b, v4.16b
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// o1 = i1 ^ (x1 + s1)
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add v1.4s, v1.4s, v9.4s
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eor v1.16b, v1.16b, v5.16b
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// o2 = i2 ^ (x2 + s2)
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add v2.4s, v2.4s, v10.4s
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eor v2.16b, v2.16b, v6.16b
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// o3 = i3 ^ (x3 + s3)
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add v3.4s, v3.4s, v11.4s
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eor v3.16b, v3.16b, v7.16b
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st1 {v0.16b-v3.16b}, [x1]
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ldp x29, x30, [sp], #16
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ret
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SYM_FUNC_END(chacha_block_xor_neon)
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SYM_FUNC_START(hchacha_block_neon)
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// x0: Input state matrix, s
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// x1: output (8 32-bit words)
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// w2: nrounds
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stp x29, x30, [sp, #-16]!
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mov x29, sp
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ld1 {v0.4s-v3.4s}, [x0]
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mov w3, w2
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bl chacha_permute
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st1 {v0.4s}, [x1], #16
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st1 {v3.4s}, [x1]
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ldp x29, x30, [sp], #16
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ret
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SYM_FUNC_END(hchacha_block_neon)
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a0 .req w12
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a1 .req w13
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a2 .req w14
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a3 .req w15
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a4 .req w16
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a5 .req w17
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a6 .req w19
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a7 .req w20
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a8 .req w21
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a9 .req w22
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a10 .req w23
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a11 .req w24
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a12 .req w25
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a13 .req w26
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a14 .req w27
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a15 .req w28
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.align 6
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SYM_FUNC_START(chacha_4block_xor_neon)
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frame_push 10
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// x0: Input state matrix, s
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// x1: 4 data blocks output, o
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// x2: 4 data blocks input, i
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// w3: nrounds
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// x4: byte count
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adr_l x10, .Lpermute
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and x5, x4, #63
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add x10, x10, x5
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//
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// This function encrypts four consecutive ChaCha blocks by loading
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// the state matrix in NEON registers four times. The algorithm performs
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// each operation on the corresponding word of each state matrix, hence
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// requires no word shuffling. For final XORing step we transpose the
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// matrix by interleaving 32- and then 64-bit words, which allows us to
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// do XOR in NEON registers.
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//
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// At the same time, a fifth block is encrypted in parallel using
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// scalar registers
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//
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adr_l x9, CTRINC // ... and ROT8
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ld1 {v30.4s-v31.4s}, [x9]
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// x0..15[0-3] = s0..3[0..3]
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add x8, x0, #16
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ld4r { v0.4s- v3.4s}, [x0]
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ld4r { v4.4s- v7.4s}, [x8], #16
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ld4r { v8.4s-v11.4s}, [x8], #16
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ld4r {v12.4s-v15.4s}, [x8]
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mov a0, v0.s[0]
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mov a1, v1.s[0]
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mov a2, v2.s[0]
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mov a3, v3.s[0]
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mov a4, v4.s[0]
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mov a5, v5.s[0]
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mov a6, v6.s[0]
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mov a7, v7.s[0]
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mov a8, v8.s[0]
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mov a9, v9.s[0]
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mov a10, v10.s[0]
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mov a11, v11.s[0]
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mov a12, v12.s[0]
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mov a13, v13.s[0]
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mov a14, v14.s[0]
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mov a15, v15.s[0]
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// x12 += counter values 1-4
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add v12.4s, v12.4s, v30.4s
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.Ldoubleround4:
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// x0 += x4, x12 = rotl32(x12 ^ x0, 16)
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// x1 += x5, x13 = rotl32(x13 ^ x1, 16)
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// x2 += x6, x14 = rotl32(x14 ^ x2, 16)
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// x3 += x7, x15 = rotl32(x15 ^ x3, 16)
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add v0.4s, v0.4s, v4.4s
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add a0, a0, a4
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add v1.4s, v1.4s, v5.4s
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add a1, a1, a5
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add v2.4s, v2.4s, v6.4s
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add a2, a2, a6
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add v3.4s, v3.4s, v7.4s
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add a3, a3, a7
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eor v12.16b, v12.16b, v0.16b
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eor a12, a12, a0
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eor v13.16b, v13.16b, v1.16b
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eor a13, a13, a1
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eor v14.16b, v14.16b, v2.16b
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eor a14, a14, a2
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eor v15.16b, v15.16b, v3.16b
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eor a15, a15, a3
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rev32 v12.8h, v12.8h
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ror a12, a12, #16
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rev32 v13.8h, v13.8h
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ror a13, a13, #16
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rev32 v14.8h, v14.8h
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ror a14, a14, #16
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rev32 v15.8h, v15.8h
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ror a15, a15, #16
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// x8 += x12, x4 = rotl32(x4 ^ x8, 12)
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// x9 += x13, x5 = rotl32(x5 ^ x9, 12)
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// x10 += x14, x6 = rotl32(x6 ^ x10, 12)
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// x11 += x15, x7 = rotl32(x7 ^ x11, 12)
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add v8.4s, v8.4s, v12.4s
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add a8, a8, a12
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add v9.4s, v9.4s, v13.4s
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add a9, a9, a13
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add v10.4s, v10.4s, v14.4s
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add a10, a10, a14
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add v11.4s, v11.4s, v15.4s
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add a11, a11, a15
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eor v16.16b, v4.16b, v8.16b
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eor a4, a4, a8
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eor v17.16b, v5.16b, v9.16b
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eor a5, a5, a9
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eor v18.16b, v6.16b, v10.16b
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eor a6, a6, a10
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eor v19.16b, v7.16b, v11.16b
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eor a7, a7, a11
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shl v4.4s, v16.4s, #12
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shl v5.4s, v17.4s, #12
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shl v6.4s, v18.4s, #12
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shl v7.4s, v19.4s, #12
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sri v4.4s, v16.4s, #20
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ror a4, a4, #20
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sri v5.4s, v17.4s, #20
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ror a5, a5, #20
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sri v6.4s, v18.4s, #20
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ror a6, a6, #20
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sri v7.4s, v19.4s, #20
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ror a7, a7, #20
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// x0 += x4, x12 = rotl32(x12 ^ x0, 8)
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// x1 += x5, x13 = rotl32(x13 ^ x1, 8)
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// x2 += x6, x14 = rotl32(x14 ^ x2, 8)
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// x3 += x7, x15 = rotl32(x15 ^ x3, 8)
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add v0.4s, v0.4s, v4.4s
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add a0, a0, a4
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add v1.4s, v1.4s, v5.4s
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add a1, a1, a5
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add v2.4s, v2.4s, v6.4s
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add a2, a2, a6
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add v3.4s, v3.4s, v7.4s
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add a3, a3, a7
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eor v12.16b, v12.16b, v0.16b
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eor a12, a12, a0
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eor v13.16b, v13.16b, v1.16b
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eor a13, a13, a1
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eor v14.16b, v14.16b, v2.16b
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eor a14, a14, a2
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eor v15.16b, v15.16b, v3.16b
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eor a15, a15, a3
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tbl v12.16b, {v12.16b}, v31.16b
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ror a12, a12, #24
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tbl v13.16b, {v13.16b}, v31.16b
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ror a13, a13, #24
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tbl v14.16b, {v14.16b}, v31.16b
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ror a14, a14, #24
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tbl v15.16b, {v15.16b}, v31.16b
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ror a15, a15, #24
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// x8 += x12, x4 = rotl32(x4 ^ x8, 7)
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// x9 += x13, x5 = rotl32(x5 ^ x9, 7)
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// x10 += x14, x6 = rotl32(x6 ^ x10, 7)
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// x11 += x15, x7 = rotl32(x7 ^ x11, 7)
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add v8.4s, v8.4s, v12.4s
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add a8, a8, a12
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add v9.4s, v9.4s, v13.4s
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add a9, a9, a13
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add v10.4s, v10.4s, v14.4s
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add a10, a10, a14
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add v11.4s, v11.4s, v15.4s
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add a11, a11, a15
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eor v16.16b, v4.16b, v8.16b
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eor a4, a4, a8
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eor v17.16b, v5.16b, v9.16b
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eor a5, a5, a9
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eor v18.16b, v6.16b, v10.16b
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eor a6, a6, a10
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eor v19.16b, v7.16b, v11.16b
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eor a7, a7, a11
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shl v4.4s, v16.4s, #7
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shl v5.4s, v17.4s, #7
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shl v6.4s, v18.4s, #7
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shl v7.4s, v19.4s, #7
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sri v4.4s, v16.4s, #25
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ror a4, a4, #25
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sri v5.4s, v17.4s, #25
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ror a5, a5, #25
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sri v6.4s, v18.4s, #25
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ror a6, a6, #25
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sri v7.4s, v19.4s, #25
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ror a7, a7, #25
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// x0 += x5, x15 = rotl32(x15 ^ x0, 16)
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// x1 += x6, x12 = rotl32(x12 ^ x1, 16)
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// x2 += x7, x13 = rotl32(x13 ^ x2, 16)
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// x3 += x4, x14 = rotl32(x14 ^ x3, 16)
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add v0.4s, v0.4s, v5.4s
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add a0, a0, a5
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add v1.4s, v1.4s, v6.4s
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add a1, a1, a6
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add v2.4s, v2.4s, v7.4s
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add a2, a2, a7
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add v3.4s, v3.4s, v4.4s
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add a3, a3, a4
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eor v15.16b, v15.16b, v0.16b
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eor a15, a15, a0
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eor v12.16b, v12.16b, v1.16b
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eor a12, a12, a1
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eor v13.16b, v13.16b, v2.16b
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eor a13, a13, a2
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eor v14.16b, v14.16b, v3.16b
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eor a14, a14, a3
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rev32 v15.8h, v15.8h
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ror a15, a15, #16
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rev32 v12.8h, v12.8h
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ror a12, a12, #16
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rev32 v13.8h, v13.8h
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ror a13, a13, #16
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rev32 v14.8h, v14.8h
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ror a14, a14, #16
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// x10 += x15, x5 = rotl32(x5 ^ x10, 12)
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// x11 += x12, x6 = rotl32(x6 ^ x11, 12)
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// x8 += x13, x7 = rotl32(x7 ^ x8, 12)
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// x9 += x14, x4 = rotl32(x4 ^ x9, 12)
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add v10.4s, v10.4s, v15.4s
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add a10, a10, a15
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add v11.4s, v11.4s, v12.4s
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add a11, a11, a12
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add v8.4s, v8.4s, v13.4s
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add a8, a8, a13
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add v9.4s, v9.4s, v14.4s
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add a9, a9, a14
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eor v16.16b, v5.16b, v10.16b
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eor a5, a5, a10
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eor v17.16b, v6.16b, v11.16b
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eor a6, a6, a11
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eor v18.16b, v7.16b, v8.16b
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eor a7, a7, a8
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eor v19.16b, v4.16b, v9.16b
|
|
eor a4, a4, a9
|
|
|
|
shl v5.4s, v16.4s, #12
|
|
shl v6.4s, v17.4s, #12
|
|
shl v7.4s, v18.4s, #12
|
|
shl v4.4s, v19.4s, #12
|
|
|
|
sri v5.4s, v16.4s, #20
|
|
ror a5, a5, #20
|
|
sri v6.4s, v17.4s, #20
|
|
ror a6, a6, #20
|
|
sri v7.4s, v18.4s, #20
|
|
ror a7, a7, #20
|
|
sri v4.4s, v19.4s, #20
|
|
ror a4, a4, #20
|
|
|
|
// x0 += x5, x15 = rotl32(x15 ^ x0, 8)
|
|
// x1 += x6, x12 = rotl32(x12 ^ x1, 8)
|
|
// x2 += x7, x13 = rotl32(x13 ^ x2, 8)
|
|
// x3 += x4, x14 = rotl32(x14 ^ x3, 8)
|
|
add v0.4s, v0.4s, v5.4s
|
|
add a0, a0, a5
|
|
add v1.4s, v1.4s, v6.4s
|
|
add a1, a1, a6
|
|
add v2.4s, v2.4s, v7.4s
|
|
add a2, a2, a7
|
|
add v3.4s, v3.4s, v4.4s
|
|
add a3, a3, a4
|
|
|
|
eor v15.16b, v15.16b, v0.16b
|
|
eor a15, a15, a0
|
|
eor v12.16b, v12.16b, v1.16b
|
|
eor a12, a12, a1
|
|
eor v13.16b, v13.16b, v2.16b
|
|
eor a13, a13, a2
|
|
eor v14.16b, v14.16b, v3.16b
|
|
eor a14, a14, a3
|
|
|
|
tbl v15.16b, {v15.16b}, v31.16b
|
|
ror a15, a15, #24
|
|
tbl v12.16b, {v12.16b}, v31.16b
|
|
ror a12, a12, #24
|
|
tbl v13.16b, {v13.16b}, v31.16b
|
|
ror a13, a13, #24
|
|
tbl v14.16b, {v14.16b}, v31.16b
|
|
ror a14, a14, #24
|
|
|
|
// x10 += x15, x5 = rotl32(x5 ^ x10, 7)
|
|
// x11 += x12, x6 = rotl32(x6 ^ x11, 7)
|
|
// x8 += x13, x7 = rotl32(x7 ^ x8, 7)
|
|
// x9 += x14, x4 = rotl32(x4 ^ x9, 7)
|
|
add v10.4s, v10.4s, v15.4s
|
|
add a10, a10, a15
|
|
add v11.4s, v11.4s, v12.4s
|
|
add a11, a11, a12
|
|
add v8.4s, v8.4s, v13.4s
|
|
add a8, a8, a13
|
|
add v9.4s, v9.4s, v14.4s
|
|
add a9, a9, a14
|
|
|
|
eor v16.16b, v5.16b, v10.16b
|
|
eor a5, a5, a10
|
|
eor v17.16b, v6.16b, v11.16b
|
|
eor a6, a6, a11
|
|
eor v18.16b, v7.16b, v8.16b
|
|
eor a7, a7, a8
|
|
eor v19.16b, v4.16b, v9.16b
|
|
eor a4, a4, a9
|
|
|
|
shl v5.4s, v16.4s, #7
|
|
shl v6.4s, v17.4s, #7
|
|
shl v7.4s, v18.4s, #7
|
|
shl v4.4s, v19.4s, #7
|
|
|
|
sri v5.4s, v16.4s, #25
|
|
ror a5, a5, #25
|
|
sri v6.4s, v17.4s, #25
|
|
ror a6, a6, #25
|
|
sri v7.4s, v18.4s, #25
|
|
ror a7, a7, #25
|
|
sri v4.4s, v19.4s, #25
|
|
ror a4, a4, #25
|
|
|
|
subs w3, w3, #2
|
|
b.ne .Ldoubleround4
|
|
|
|
ld4r {v16.4s-v19.4s}, [x0], #16
|
|
ld4r {v20.4s-v23.4s}, [x0], #16
|
|
|
|
// x12 += counter values 0-3
|
|
add v12.4s, v12.4s, v30.4s
|
|
|
|
// x0[0-3] += s0[0]
|
|
// x1[0-3] += s0[1]
|
|
// x2[0-3] += s0[2]
|
|
// x3[0-3] += s0[3]
|
|
add v0.4s, v0.4s, v16.4s
|
|
mov w6, v16.s[0]
|
|
mov w7, v17.s[0]
|
|
add v1.4s, v1.4s, v17.4s
|
|
mov w8, v18.s[0]
|
|
mov w9, v19.s[0]
|
|
add v2.4s, v2.4s, v18.4s
|
|
add a0, a0, w6
|
|
add a1, a1, w7
|
|
add v3.4s, v3.4s, v19.4s
|
|
add a2, a2, w8
|
|
add a3, a3, w9
|
|
CPU_BE( rev a0, a0 )
|
|
CPU_BE( rev a1, a1 )
|
|
CPU_BE( rev a2, a2 )
|
|
CPU_BE( rev a3, a3 )
|
|
|
|
ld4r {v24.4s-v27.4s}, [x0], #16
|
|
ld4r {v28.4s-v31.4s}, [x0]
|
|
|
|
// x4[0-3] += s1[0]
|
|
// x5[0-3] += s1[1]
|
|
// x6[0-3] += s1[2]
|
|
// x7[0-3] += s1[3]
|
|
add v4.4s, v4.4s, v20.4s
|
|
mov w6, v20.s[0]
|
|
mov w7, v21.s[0]
|
|
add v5.4s, v5.4s, v21.4s
|
|
mov w8, v22.s[0]
|
|
mov w9, v23.s[0]
|
|
add v6.4s, v6.4s, v22.4s
|
|
add a4, a4, w6
|
|
add a5, a5, w7
|
|
add v7.4s, v7.4s, v23.4s
|
|
add a6, a6, w8
|
|
add a7, a7, w9
|
|
CPU_BE( rev a4, a4 )
|
|
CPU_BE( rev a5, a5 )
|
|
CPU_BE( rev a6, a6 )
|
|
CPU_BE( rev a7, a7 )
|
|
|
|
// x8[0-3] += s2[0]
|
|
// x9[0-3] += s2[1]
|
|
// x10[0-3] += s2[2]
|
|
// x11[0-3] += s2[3]
|
|
add v8.4s, v8.4s, v24.4s
|
|
mov w6, v24.s[0]
|
|
mov w7, v25.s[0]
|
|
add v9.4s, v9.4s, v25.4s
|
|
mov w8, v26.s[0]
|
|
mov w9, v27.s[0]
|
|
add v10.4s, v10.4s, v26.4s
|
|
add a8, a8, w6
|
|
add a9, a9, w7
|
|
add v11.4s, v11.4s, v27.4s
|
|
add a10, a10, w8
|
|
add a11, a11, w9
|
|
CPU_BE( rev a8, a8 )
|
|
CPU_BE( rev a9, a9 )
|
|
CPU_BE( rev a10, a10 )
|
|
CPU_BE( rev a11, a11 )
|
|
|
|
// x12[0-3] += s3[0]
|
|
// x13[0-3] += s3[1]
|
|
// x14[0-3] += s3[2]
|
|
// x15[0-3] += s3[3]
|
|
add v12.4s, v12.4s, v28.4s
|
|
mov w6, v28.s[0]
|
|
mov w7, v29.s[0]
|
|
add v13.4s, v13.4s, v29.4s
|
|
mov w8, v30.s[0]
|
|
mov w9, v31.s[0]
|
|
add v14.4s, v14.4s, v30.4s
|
|
add a12, a12, w6
|
|
add a13, a13, w7
|
|
add v15.4s, v15.4s, v31.4s
|
|
add a14, a14, w8
|
|
add a15, a15, w9
|
|
CPU_BE( rev a12, a12 )
|
|
CPU_BE( rev a13, a13 )
|
|
CPU_BE( rev a14, a14 )
|
|
CPU_BE( rev a15, a15 )
|
|
|
|
// interleave 32-bit words in state n, n+1
|
|
ldp w6, w7, [x2], #64
|
|
zip1 v16.4s, v0.4s, v1.4s
|
|
ldp w8, w9, [x2, #-56]
|
|
eor a0, a0, w6
|
|
zip2 v17.4s, v0.4s, v1.4s
|
|
eor a1, a1, w7
|
|
zip1 v18.4s, v2.4s, v3.4s
|
|
eor a2, a2, w8
|
|
zip2 v19.4s, v2.4s, v3.4s
|
|
eor a3, a3, w9
|
|
ldp w6, w7, [x2, #-48]
|
|
zip1 v20.4s, v4.4s, v5.4s
|
|
ldp w8, w9, [x2, #-40]
|
|
eor a4, a4, w6
|
|
zip2 v21.4s, v4.4s, v5.4s
|
|
eor a5, a5, w7
|
|
zip1 v22.4s, v6.4s, v7.4s
|
|
eor a6, a6, w8
|
|
zip2 v23.4s, v6.4s, v7.4s
|
|
eor a7, a7, w9
|
|
ldp w6, w7, [x2, #-32]
|
|
zip1 v24.4s, v8.4s, v9.4s
|
|
ldp w8, w9, [x2, #-24]
|
|
eor a8, a8, w6
|
|
zip2 v25.4s, v8.4s, v9.4s
|
|
eor a9, a9, w7
|
|
zip1 v26.4s, v10.4s, v11.4s
|
|
eor a10, a10, w8
|
|
zip2 v27.4s, v10.4s, v11.4s
|
|
eor a11, a11, w9
|
|
ldp w6, w7, [x2, #-16]
|
|
zip1 v28.4s, v12.4s, v13.4s
|
|
ldp w8, w9, [x2, #-8]
|
|
eor a12, a12, w6
|
|
zip2 v29.4s, v12.4s, v13.4s
|
|
eor a13, a13, w7
|
|
zip1 v30.4s, v14.4s, v15.4s
|
|
eor a14, a14, w8
|
|
zip2 v31.4s, v14.4s, v15.4s
|
|
eor a15, a15, w9
|
|
|
|
add x3, x2, x4
|
|
sub x3, x3, #128 // start of last block
|
|
|
|
subs x5, x4, #128
|
|
csel x2, x2, x3, ge
|
|
|
|
// interleave 64-bit words in state n, n+2
|
|
zip1 v0.2d, v16.2d, v18.2d
|
|
zip2 v4.2d, v16.2d, v18.2d
|
|
stp a0, a1, [x1], #64
|
|
zip1 v8.2d, v17.2d, v19.2d
|
|
zip2 v12.2d, v17.2d, v19.2d
|
|
stp a2, a3, [x1, #-56]
|
|
|
|
subs x6, x4, #192
|
|
ld1 {v16.16b-v19.16b}, [x2], #64
|
|
csel x2, x2, x3, ge
|
|
|
|
zip1 v1.2d, v20.2d, v22.2d
|
|
zip2 v5.2d, v20.2d, v22.2d
|
|
stp a4, a5, [x1, #-48]
|
|
zip1 v9.2d, v21.2d, v23.2d
|
|
zip2 v13.2d, v21.2d, v23.2d
|
|
stp a6, a7, [x1, #-40]
|
|
|
|
subs x7, x4, #256
|
|
ld1 {v20.16b-v23.16b}, [x2], #64
|
|
csel x2, x2, x3, ge
|
|
|
|
zip1 v2.2d, v24.2d, v26.2d
|
|
zip2 v6.2d, v24.2d, v26.2d
|
|
stp a8, a9, [x1, #-32]
|
|
zip1 v10.2d, v25.2d, v27.2d
|
|
zip2 v14.2d, v25.2d, v27.2d
|
|
stp a10, a11, [x1, #-24]
|
|
|
|
subs x8, x4, #320
|
|
ld1 {v24.16b-v27.16b}, [x2], #64
|
|
csel x2, x2, x3, ge
|
|
|
|
zip1 v3.2d, v28.2d, v30.2d
|
|
zip2 v7.2d, v28.2d, v30.2d
|
|
stp a12, a13, [x1, #-16]
|
|
zip1 v11.2d, v29.2d, v31.2d
|
|
zip2 v15.2d, v29.2d, v31.2d
|
|
stp a14, a15, [x1, #-8]
|
|
|
|
tbnz x5, #63, .Lt128
|
|
ld1 {v28.16b-v31.16b}, [x2]
|
|
|
|
// xor with corresponding input, write to output
|
|
eor v16.16b, v16.16b, v0.16b
|
|
eor v17.16b, v17.16b, v1.16b
|
|
eor v18.16b, v18.16b, v2.16b
|
|
eor v19.16b, v19.16b, v3.16b
|
|
|
|
tbnz x6, #63, .Lt192
|
|
|
|
eor v20.16b, v20.16b, v4.16b
|
|
eor v21.16b, v21.16b, v5.16b
|
|
eor v22.16b, v22.16b, v6.16b
|
|
eor v23.16b, v23.16b, v7.16b
|
|
|
|
st1 {v16.16b-v19.16b}, [x1], #64
|
|
tbnz x7, #63, .Lt256
|
|
|
|
eor v24.16b, v24.16b, v8.16b
|
|
eor v25.16b, v25.16b, v9.16b
|
|
eor v26.16b, v26.16b, v10.16b
|
|
eor v27.16b, v27.16b, v11.16b
|
|
|
|
st1 {v20.16b-v23.16b}, [x1], #64
|
|
tbnz x8, #63, .Lt320
|
|
|
|
eor v28.16b, v28.16b, v12.16b
|
|
eor v29.16b, v29.16b, v13.16b
|
|
eor v30.16b, v30.16b, v14.16b
|
|
eor v31.16b, v31.16b, v15.16b
|
|
|
|
st1 {v24.16b-v27.16b}, [x1], #64
|
|
st1 {v28.16b-v31.16b}, [x1]
|
|
|
|
.Lout: frame_pop
|
|
ret
|
|
|
|
// fewer than 192 bytes of in/output
|
|
.Lt192: cbz x5, 1f // exactly 128 bytes?
|
|
ld1 {v28.16b-v31.16b}, [x10]
|
|
add x5, x5, x1
|
|
tbl v28.16b, {v4.16b-v7.16b}, v28.16b
|
|
tbl v29.16b, {v4.16b-v7.16b}, v29.16b
|
|
tbl v30.16b, {v4.16b-v7.16b}, v30.16b
|
|
tbl v31.16b, {v4.16b-v7.16b}, v31.16b
|
|
|
|
0: eor v20.16b, v20.16b, v28.16b
|
|
eor v21.16b, v21.16b, v29.16b
|
|
eor v22.16b, v22.16b, v30.16b
|
|
eor v23.16b, v23.16b, v31.16b
|
|
st1 {v20.16b-v23.16b}, [x5] // overlapping stores
|
|
1: st1 {v16.16b-v19.16b}, [x1]
|
|
b .Lout
|
|
|
|
// fewer than 128 bytes of in/output
|
|
.Lt128: ld1 {v28.16b-v31.16b}, [x10]
|
|
add x5, x5, x1
|
|
sub x1, x1, #64
|
|
tbl v28.16b, {v0.16b-v3.16b}, v28.16b
|
|
tbl v29.16b, {v0.16b-v3.16b}, v29.16b
|
|
tbl v30.16b, {v0.16b-v3.16b}, v30.16b
|
|
tbl v31.16b, {v0.16b-v3.16b}, v31.16b
|
|
ld1 {v16.16b-v19.16b}, [x1] // reload first output block
|
|
b 0b
|
|
|
|
// fewer than 256 bytes of in/output
|
|
.Lt256: cbz x6, 2f // exactly 192 bytes?
|
|
ld1 {v4.16b-v7.16b}, [x10]
|
|
add x6, x6, x1
|
|
tbl v0.16b, {v8.16b-v11.16b}, v4.16b
|
|
tbl v1.16b, {v8.16b-v11.16b}, v5.16b
|
|
tbl v2.16b, {v8.16b-v11.16b}, v6.16b
|
|
tbl v3.16b, {v8.16b-v11.16b}, v7.16b
|
|
|
|
eor v28.16b, v28.16b, v0.16b
|
|
eor v29.16b, v29.16b, v1.16b
|
|
eor v30.16b, v30.16b, v2.16b
|
|
eor v31.16b, v31.16b, v3.16b
|
|
st1 {v28.16b-v31.16b}, [x6] // overlapping stores
|
|
2: st1 {v20.16b-v23.16b}, [x1]
|
|
b .Lout
|
|
|
|
// fewer than 320 bytes of in/output
|
|
.Lt320: cbz x7, 3f // exactly 256 bytes?
|
|
ld1 {v4.16b-v7.16b}, [x10]
|
|
add x7, x7, x1
|
|
tbl v0.16b, {v12.16b-v15.16b}, v4.16b
|
|
tbl v1.16b, {v12.16b-v15.16b}, v5.16b
|
|
tbl v2.16b, {v12.16b-v15.16b}, v6.16b
|
|
tbl v3.16b, {v12.16b-v15.16b}, v7.16b
|
|
|
|
eor v28.16b, v28.16b, v0.16b
|
|
eor v29.16b, v29.16b, v1.16b
|
|
eor v30.16b, v30.16b, v2.16b
|
|
eor v31.16b, v31.16b, v3.16b
|
|
st1 {v28.16b-v31.16b}, [x7] // overlapping stores
|
|
3: st1 {v24.16b-v27.16b}, [x1]
|
|
b .Lout
|
|
SYM_FUNC_END(chacha_4block_xor_neon)
|
|
|
|
.section ".rodata", "a", %progbits
|
|
.align L1_CACHE_SHIFT
|
|
.Lpermute:
|
|
.set .Li, 0
|
|
.rept 128
|
|
.byte (.Li - 64)
|
|
.set .Li, .Li + 1
|
|
.endr
|
|
|
|
CTRINC: .word 1, 2, 3, 4
|
|
ROT8: .word 0x02010003, 0x06050407, 0x0a09080b, 0x0e0d0c0f
|