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225 lines
5.4 KiB
ArmAsm
225 lines
5.4 KiB
ArmAsm
// Copyright 2018 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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//go:build gc && !purego
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// +build gc,!purego
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#include "go_asm.h"
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#include "textflag.h"
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// This is an implementation of the ChaCha20 encryption algorithm as
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// specified in RFC 7539. It uses vector instructions to compute
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// 4 keystream blocks in parallel (256 bytes) which are then XORed
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// with the bytes in the input slice.
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GLOBL ·constants<>(SB), RODATA|NOPTR, $32
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// BSWAP: swap bytes in each 4-byte element
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DATA ·constants<>+0x00(SB)/4, $0x03020100
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DATA ·constants<>+0x04(SB)/4, $0x07060504
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DATA ·constants<>+0x08(SB)/4, $0x0b0a0908
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DATA ·constants<>+0x0c(SB)/4, $0x0f0e0d0c
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// J0: [j0, j1, j2, j3]
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DATA ·constants<>+0x10(SB)/4, $0x61707865
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DATA ·constants<>+0x14(SB)/4, $0x3320646e
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DATA ·constants<>+0x18(SB)/4, $0x79622d32
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DATA ·constants<>+0x1c(SB)/4, $0x6b206574
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#define BSWAP V5
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#define J0 V6
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#define KEY0 V7
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#define KEY1 V8
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#define NONCE V9
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#define CTR V10
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#define M0 V11
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#define M1 V12
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#define M2 V13
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#define M3 V14
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#define INC V15
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#define X0 V16
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#define X1 V17
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#define X2 V18
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#define X3 V19
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#define X4 V20
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#define X5 V21
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#define X6 V22
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#define X7 V23
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#define X8 V24
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#define X9 V25
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#define X10 V26
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#define X11 V27
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#define X12 V28
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#define X13 V29
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#define X14 V30
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#define X15 V31
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#define NUM_ROUNDS 20
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#define ROUND4(a0, a1, a2, a3, b0, b1, b2, b3, c0, c1, c2, c3, d0, d1, d2, d3) \
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VAF a1, a0, a0 \
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VAF b1, b0, b0 \
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VAF c1, c0, c0 \
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VAF d1, d0, d0 \
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VX a0, a2, a2 \
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VX b0, b2, b2 \
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VX c0, c2, c2 \
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VX d0, d2, d2 \
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VERLLF $16, a2, a2 \
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VERLLF $16, b2, b2 \
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VERLLF $16, c2, c2 \
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VERLLF $16, d2, d2 \
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VAF a2, a3, a3 \
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VAF b2, b3, b3 \
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VAF c2, c3, c3 \
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VAF d2, d3, d3 \
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VX a3, a1, a1 \
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VX b3, b1, b1 \
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VX c3, c1, c1 \
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VX d3, d1, d1 \
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VERLLF $12, a1, a1 \
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VERLLF $12, b1, b1 \
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VERLLF $12, c1, c1 \
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VERLLF $12, d1, d1 \
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VAF a1, a0, a0 \
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VAF b1, b0, b0 \
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VAF c1, c0, c0 \
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VAF d1, d0, d0 \
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VX a0, a2, a2 \
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VX b0, b2, b2 \
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VX c0, c2, c2 \
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VX d0, d2, d2 \
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VERLLF $8, a2, a2 \
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VERLLF $8, b2, b2 \
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VERLLF $8, c2, c2 \
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VERLLF $8, d2, d2 \
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VAF a2, a3, a3 \
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VAF b2, b3, b3 \
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VAF c2, c3, c3 \
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VAF d2, d3, d3 \
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VX a3, a1, a1 \
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VX b3, b1, b1 \
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VX c3, c1, c1 \
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VX d3, d1, d1 \
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VERLLF $7, a1, a1 \
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VERLLF $7, b1, b1 \
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VERLLF $7, c1, c1 \
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VERLLF $7, d1, d1
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#define PERMUTE(mask, v0, v1, v2, v3) \
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VPERM v0, v0, mask, v0 \
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VPERM v1, v1, mask, v1 \
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VPERM v2, v2, mask, v2 \
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VPERM v3, v3, mask, v3
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#define ADDV(x, v0, v1, v2, v3) \
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VAF x, v0, v0 \
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VAF x, v1, v1 \
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VAF x, v2, v2 \
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VAF x, v3, v3
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#define XORV(off, dst, src, v0, v1, v2, v3) \
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VLM off(src), M0, M3 \
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PERMUTE(BSWAP, v0, v1, v2, v3) \
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VX v0, M0, M0 \
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VX v1, M1, M1 \
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VX v2, M2, M2 \
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VX v3, M3, M3 \
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VSTM M0, M3, off(dst)
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#define SHUFFLE(a, b, c, d, t, u, v, w) \
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VMRHF a, c, t \ // t = {a[0], c[0], a[1], c[1]}
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VMRHF b, d, u \ // u = {b[0], d[0], b[1], d[1]}
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VMRLF a, c, v \ // v = {a[2], c[2], a[3], c[3]}
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VMRLF b, d, w \ // w = {b[2], d[2], b[3], d[3]}
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VMRHF t, u, a \ // a = {a[0], b[0], c[0], d[0]}
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VMRLF t, u, b \ // b = {a[1], b[1], c[1], d[1]}
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VMRHF v, w, c \ // c = {a[2], b[2], c[2], d[2]}
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VMRLF v, w, d // d = {a[3], b[3], c[3], d[3]}
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// func xorKeyStreamVX(dst, src []byte, key *[8]uint32, nonce *[3]uint32, counter *uint32)
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TEXT ·xorKeyStreamVX(SB), NOSPLIT, $0
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MOVD $·constants<>(SB), R1
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MOVD dst+0(FP), R2 // R2=&dst[0]
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LMG src+24(FP), R3, R4 // R3=&src[0] R4=len(src)
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MOVD key+48(FP), R5 // R5=key
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MOVD nonce+56(FP), R6 // R6=nonce
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MOVD counter+64(FP), R7 // R7=counter
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// load BSWAP and J0
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VLM (R1), BSWAP, J0
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// setup
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MOVD $95, R0
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VLM (R5), KEY0, KEY1
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VLL R0, (R6), NONCE
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VZERO M0
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VLEIB $7, $32, M0
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VSRLB M0, NONCE, NONCE
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// initialize counter values
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VLREPF (R7), CTR
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VZERO INC
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VLEIF $1, $1, INC
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VLEIF $2, $2, INC
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VLEIF $3, $3, INC
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VAF INC, CTR, CTR
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VREPIF $4, INC
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chacha:
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VREPF $0, J0, X0
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VREPF $1, J0, X1
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VREPF $2, J0, X2
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VREPF $3, J0, X3
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VREPF $0, KEY0, X4
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VREPF $1, KEY0, X5
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VREPF $2, KEY0, X6
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VREPF $3, KEY0, X7
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VREPF $0, KEY1, X8
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VREPF $1, KEY1, X9
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VREPF $2, KEY1, X10
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VREPF $3, KEY1, X11
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VLR CTR, X12
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VREPF $1, NONCE, X13
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VREPF $2, NONCE, X14
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VREPF $3, NONCE, X15
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MOVD $(NUM_ROUNDS/2), R1
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loop:
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ROUND4(X0, X4, X12, X8, X1, X5, X13, X9, X2, X6, X14, X10, X3, X7, X15, X11)
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ROUND4(X0, X5, X15, X10, X1, X6, X12, X11, X2, X7, X13, X8, X3, X4, X14, X9)
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ADD $-1, R1
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BNE loop
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// decrement length
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ADD $-256, R4
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// rearrange vectors
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SHUFFLE(X0, X1, X2, X3, M0, M1, M2, M3)
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ADDV(J0, X0, X1, X2, X3)
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SHUFFLE(X4, X5, X6, X7, M0, M1, M2, M3)
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ADDV(KEY0, X4, X5, X6, X7)
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SHUFFLE(X8, X9, X10, X11, M0, M1, M2, M3)
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ADDV(KEY1, X8, X9, X10, X11)
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VAF CTR, X12, X12
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SHUFFLE(X12, X13, X14, X15, M0, M1, M2, M3)
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ADDV(NONCE, X12, X13, X14, X15)
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// increment counters
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VAF INC, CTR, CTR
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// xor keystream with plaintext
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XORV(0*64, R2, R3, X0, X4, X8, X12)
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XORV(1*64, R2, R3, X1, X5, X9, X13)
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XORV(2*64, R2, R3, X2, X6, X10, X14)
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XORV(3*64, R2, R3, X3, X7, X11, X15)
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// increment pointers
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MOVD $256(R2), R2
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MOVD $256(R3), R3
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CMPBNE R4, $0, chacha
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VSTEF $0, CTR, (R7)
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RET
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