// Copyright 2017 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.

// +build arm64, !noasm

#include "textflag.h"
DATA rotInvSRows<>+0x00(SB)/8, $0x080f0205040b0e01
DATA rotInvSRows<>+0x08(SB)/8, $0x00070a0d0c030609
GLOBL rotInvSRows<>(SB), (NOPTR+RODATA), $16
DATA invSRows<>+0x00(SB)/8, $0x0b0e0104070a0d00
DATA invSRows<>+0x08(SB)/8, $0x0306090c0f020508
GLOBL invSRows<>(SB), (NOPTR+RODATA), $16
// func encryptBlockAsm(nr int, xk *uint32, dst, src *byte)
TEXT ·encryptBlockAsm(SB),NOSPLIT,$0
	MOVD	nr+0(FP), R9
	MOVD	xk+8(FP), R10
	MOVD	dst+16(FP), R11
	MOVD	src+24(FP), R12

	VLD1	(R12), [V0.B16]

	CMP	$12, R9
	BLT	enc128
	BEQ	enc196
enc256:
	VLD1.P	32(R10), [V1.B16, V2.B16]
	AESE	V1.B16, V0.B16
	AESMC	V0.B16, V0.B16
	AESE	V2.B16, V0.B16
	AESMC	V0.B16, V0.B16
enc196:
	VLD1.P	32(R10), [V3.B16, V4.B16]
	AESE	V3.B16, V0.B16
	AESMC	V0.B16, V0.B16
	AESE	V4.B16, V0.B16
	AESMC	V0.B16, V0.B16
enc128:
	VLD1.P	64(R10), [V5.B16, V6.B16, V7.B16, V8.B16]
	VLD1.P	64(R10), [V9.B16, V10.B16, V11.B16, V12.B16]
	VLD1.P	48(R10), [V13.B16, V14.B16, V15.B16]
	AESE	V5.B16, V0.B16
	AESMC	V0.B16, V0.B16
	AESE	V6.B16, V0.B16
	AESMC	V0.B16, V0.B16
	AESE	V7.B16, V0.B16
	AESMC	V0.B16, V0.B16
	AESE	V8.B16, V0.B16
	AESMC	V0.B16, V0.B16
	AESE	V9.B16, V0.B16
	AESMC	V0.B16, V0.B16
	AESE	V10.B16, V0.B16
	AESMC	V0.B16, V0.B16
	AESE	V11.B16, V0.B16
	AESMC	V0.B16, V0.B16
	AESE	V12.B16, V0.B16
	AESMC	V0.B16, V0.B16
	AESE	V13.B16, V0.B16
	AESMC	V0.B16, V0.B16
	AESE	V14.B16, V0.B16
	VEOR    V0.B16, V15.B16, V0.B16
	VST1	[V0.B16], (R11)
	RET

// func decryptBlockAsm(nr int, xk *uint32, dst, src *byte)
TEXT ·decryptBlockAsm(SB),NOSPLIT,$0
	MOVD	nr+0(FP), R9
	MOVD	xk+8(FP), R10
	MOVD	dst+16(FP), R11
	MOVD	src+24(FP), R12

	VLD1	(R12), [V0.B16]

	CMP	$12, R9
	BLT	dec128
	BEQ	dec196
dec256:
	VLD1.P	32(R10), [V1.B16, V2.B16]
	AESD	V1.B16, V0.B16
	AESIMC	V0.B16, V0.B16
	AESD	V2.B16, V0.B16
	AESIMC	V0.B16, V0.B16
dec196:
	VLD1.P	32(R10), [V3.B16, V4.B16]
	AESD	V3.B16, V0.B16
	AESIMC	V0.B16, V0.B16
	AESD	V4.B16, V0.B16
	AESIMC	V0.B16, V0.B16
dec128:
	VLD1.P	64(R10), [V5.B16, V6.B16, V7.B16, V8.B16]
	VLD1.P	64(R10), [V9.B16, V10.B16, V11.B16, V12.B16]
	VLD1.P	48(R10), [V13.B16, V14.B16, V15.B16]
	AESD	V5.B16, V0.B16
	AESIMC	V0.B16, V0.B16
	AESD	V6.B16, V0.B16
	AESIMC	V0.B16, V0.B16
	AESD	V7.B16, V0.B16
	AESIMC	V0.B16, V0.B16
	AESD	V8.B16, V0.B16
	AESIMC	V0.B16, V0.B16
	AESD	V9.B16, V0.B16
	AESIMC	V0.B16, V0.B16
	AESD	V10.B16, V0.B16
	AESIMC	V0.B16, V0.B16
	AESD	V11.B16, V0.B16
	AESIMC	V0.B16, V0.B16
	AESD	V12.B16, V0.B16
	AESIMC	V0.B16, V0.B16
	AESD	V13.B16, V0.B16
	AESIMC	V0.B16, V0.B16
	AESD	V14.B16, V0.B16
	VEOR    V0.B16, V15.B16, V0.B16
	VST1	[V0.B16], (R11)
	RET

// func expandKeyAsm(nr int, key *byte, enc, dec *uint32) {
// Note that round keys are stored in uint128 format, not uint32
TEXT ·expandKeyAsm(SB),NOSPLIT,$0
	MOVD	nr+0(FP), R8
	MOVD	key+8(FP), R9
	MOVD	enc+16(FP), R10
	MOVD	dec+24(FP), R11
	LDP	rotInvSRows<>(SB), (R0, R1)
	VMOV	R0, V3.D[0]
	VMOV	R1, V3.D[1]
	VEOR	V0.B16, V0.B16, V0.B16 // All zeroes
	MOVW	$1, R13
	TBZ	$1, R8, ks192
	TBNZ	$2, R8, ks256
	LDPW	(R9), (R4, R5)
	LDPW	8(R9), (R6, R7)
	STPW.P	(R4, R5), 8(R10)
	STPW.P	(R6, R7), 8(R10)
	MOVW	$0x1b, R14
ks128Loop:
		VMOV	R7, V2.S[0]
		WORD	$0x4E030042       // TBL V3.B16, [V2.B16], V2.B16
		AESE	V0.B16, V2.B16    // Use AES to compute the SBOX
		EORW	R13, R4
		LSLW	$1, R13           // Compute next Rcon
		ANDSW	$0x100, R13, ZR
		CSELW	NE, R14, R13, R13 // Fake modulo
		SUBS	$1, R8
		VMOV	V2.S[0], R0
		EORW	R0, R4
		EORW	R4, R5
		EORW	R5, R6
		EORW	R6, R7
		STPW.P	(R4, R5), 8(R10)
		STPW.P	(R6, R7), 8(R10)
	BNE	ks128Loop
	CBZ	R11, ksDone       // If dec is nil we are done
	SUB	$176, R10
        // Decryption keys are encryption keys with InverseMixColumns applied
	VLD1.P	64(R10), [V0.B16, V1.B16, V2.B16, V3.B16]
	VMOV	V0.B16, V7.B16
	AESIMC	V1.B16, V6.B16
	AESIMC	V2.B16, V5.B16
	AESIMC	V3.B16, V4.B16
	VLD1.P	64(R10), [V0.B16, V1.B16, V2.B16, V3.B16]
	AESIMC	V0.B16, V11.B16
	AESIMC	V1.B16, V10.B16
	AESIMC	V2.B16, V9.B16
	AESIMC	V3.B16, V8.B16
	VLD1	(R10), [V0.B16, V1.B16, V2.B16]
	AESIMC	V0.B16, V14.B16
	AESIMC	V1.B16, V13.B16
	VMOV	V2.B16, V12.B16
	VST1.P	[V12.B16, V13.B16, V14.B16], 48(R11)
	VST1.P	[V8.B16, V9.B16, V10.B16, V11.B16], 64(R11)
	VST1	[V4.B16, V5.B16, V6.B16, V7.B16], (R11)
	B	ksDone
ks192:
	LDPW	(R9), (R2, R3)
	LDPW	8(R9), (R4, R5)
	LDPW	16(R9), (R6, R7)
	STPW.P	(R2, R3), 8(R10)
	STPW.P	(R4, R5), 8(R10)
	SUB	$4, R8
ks192Loop:
		STPW.P	(R6, R7), 8(R10)
		VMOV	R7, V2.S[0]
		WORD	$0x4E030042 //TBL	V3.B16, [V2.B16], V2.B16
		AESE	V0.B16, V2.B16
		EORW	R13, R2
		LSLW	$1, R13
		SUBS	$1, R8
		VMOV	V2.S[0], R0
		EORW	R0, R2
		EORW	R2, R3
		EORW	R3, R4
		EORW	R4, R5
		EORW	R5, R6
		EORW	R6, R7
		STPW.P	(R2, R3), 8(R10)
		STPW.P	(R4, R5), 8(R10)
	BNE	ks192Loop
	CBZ	R11, ksDone
	SUB	$208, R10
	VLD1.P	64(R10), [V0.B16, V1.B16, V2.B16, V3.B16]
	VMOV	V0.B16, V7.B16
	AESIMC	V1.B16, V6.B16
	AESIMC	V2.B16, V5.B16
	AESIMC	V3.B16, V4.B16
	VLD1.P	64(R10), [V0.B16, V1.B16, V2.B16, V3.B16]
	AESIMC	V0.B16, V11.B16
	AESIMC	V1.B16, V10.B16
	AESIMC	V2.B16, V9.B16
	AESIMC	V3.B16, V8.B16
	VLD1.P	64(R10), [V0.B16, V1.B16, V2.B16, V3.B16]
	AESIMC	V0.B16, V15.B16
	AESIMC	V1.B16, V14.B16
	AESIMC	V2.B16, V13.B16
	AESIMC	V3.B16, V12.B16
	VLD1	(R10), [V0.B16]
	VST1.P	[V0.B16], 16(R11)
	VST1.P	[V12.B16, V13.B16, V14.B16, V15.B16], 64(R11)
	VST1.P	[V8.B16, V9.B16, V10.B16, V11.B16], 64(R11)
	VST1	[V4.B16, V5.B16, V6.B16, V7.B16], (R11)
	B	ksDone
ks256:
	LDP	invSRows<>(SB), (R0, R1)
	VMOV	R0, V4.D[0]
	VMOV	R1, V4.D[1]
	LDPW	(R9), (R0, R1)
	LDPW	8(R9), (R2, R3)
	LDPW	16(R9), (R4, R5)
	LDPW	24(R9), (R6, R7)
	STPW.P	(R0, R1), 8(R10)
	STPW.P	(R2, R3), 8(R10)
	SUB	$7, R8
ks256Loop:
		STPW.P	(R4, R5), 8(R10)
		STPW.P	(R6, R7), 8(R10)
		VMOV	R7, V2.S[0]
		WORD	$0x4E030042 //TBL	V3.B16, [V2.B16], V2.B16
		AESE	V0.B16, V2.B16
		EORW	R13, R0
		LSLW	$1, R13
		SUBS	$1, R8
		VMOV	V2.S[0], R9
		EORW	R9, R0
		EORW	R0, R1
		EORW	R1, R2
		EORW	R2, R3
		VMOV	R3, V2.S[0]
		WORD	$0x4E040042 //TBL	V3.B16, [V2.B16], V2.B16
		AESE	V0.B16, V2.B16
		VMOV	V2.S[0], R9
		EORW	R9, R4
		EORW	R4, R5
		EORW	R5, R6
		EORW	R6, R7
		STPW.P	(R0, R1), 8(R10)
		STPW.P	(R2, R3), 8(R10)
	BNE	ks256Loop
	CBZ	R11, ksDone
	SUB	$240, R10
	VLD1.P	64(R10), [V0.B16, V1.B16, V2.B16, V3.B16]
	VMOV	V0.B16, V7.B16
	AESIMC	V1.B16, V6.B16
	AESIMC	V2.B16, V5.B16
	AESIMC	V3.B16, V4.B16
	VLD1.P	64(R10), [V0.B16, V1.B16, V2.B16, V3.B16]
	AESIMC	V0.B16, V11.B16
	AESIMC	V1.B16, V10.B16
	AESIMC	V2.B16, V9.B16
	AESIMC	V3.B16, V8.B16
	VLD1.P	64(R10), [V0.B16, V1.B16, V2.B16, V3.B16]
	AESIMC	V0.B16, V15.B16
	AESIMC	V1.B16, V14.B16
	AESIMC	V2.B16, V13.B16
	AESIMC	V3.B16, V12.B16
	VLD1	(R10), [V0.B16, V1.B16, V2.B16]
	AESIMC	V0.B16, V18.B16
	AESIMC	V1.B16, V17.B16
	VMOV	V2.B16, V16.B16
	VST1.P	[V16.B16, V17.B16, V18.B16], 48(R11)
	VST1.P	[V12.B16, V13.B16, V14.B16, V15.B16], 64(R11)
	VST1.P	[V8.B16, V9.B16, V10.B16, V11.B16], 64(R11)
	VST1	[V4.B16, V5.B16, V6.B16, V7.B16], (R11)
ksDone:
	RET