#! /usr/bin/env perl
# SPDX-License-Identifier: GPL-2.0

# This code is taken from CRYPTOGAMs[1] and is included here using the option
# in the license to distribute the code under the GPL. Therefore this program
# is free software; you can redistribute it and/or modify it under the terms of
# the GNU General Public License version 2 as published by the Free Software
# Foundation.
#
# [1] https://www.openssl.org/~appro/cryptogams/

# Copyright (c) 2006-2017, CRYPTOGAMS by <appro@openssl.org>
# All rights reserved.
#
# Redistribution and use in source and binary forms, with or without
# modification, are permitted provided that the following conditions
# are met:
#
#       * Redistributions of source code must retain copyright notices,
#         this list of conditions and the following disclaimer.
#
#       * Redistributions in binary form must reproduce the above
#         copyright notice, this list of conditions and the following
#         disclaimer in the documentation and/or other materials
#         provided with the distribution.
#
#       * Neither the name of the CRYPTOGAMS nor the names of its
#         copyright holder and contributors may be used to endorse or
#         promote products derived from this software without specific
#         prior written permission.
#
# ALTERNATIVELY, provided that this notice is retained in full, this
# product may be distributed under the terms of the GNU General Public
# License (GPL), in which case the provisions of the GPL apply INSTEAD OF
# those given above.
#
# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDER AND CONTRIBUTORS
# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

# ====================================================================
# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
# project. The module is, however, dual licensed under OpenSSL and
# CRYPTOGAMS licenses depending on where you obtain it. For further
# details see https://www.openssl.org/~appro/cryptogams/.
# ====================================================================
#
# This module implements support for AES instructions as per PowerISA
# specification version 2.07, first implemented by POWER8 processor.
# The module is endian-agnostic in sense that it supports both big-
# and little-endian cases. Data alignment in parallelizable modes is
# handled with VSX loads and stores, which implies MSR.VSX flag being
# set. It should also be noted that ISA specification doesn't prohibit
# alignment exceptions for these instructions on page boundaries.
# Initially alignment was handled in pure AltiVec/VMX way [when data
# is aligned programmatically, which in turn guarantees exception-
# free execution], but it turned to hamper performance when vcipher
# instructions are interleaved. It's reckoned that eventual
# misalignment penalties at page boundaries are in average lower
# than additional overhead in pure AltiVec approach.
#
# May 2016
#
# Add XTS subroutine, 9x on little- and 12x improvement on big-endian
# systems were measured.
#
######################################################################
# Current large-block performance in cycles per byte processed with
# 128-bit key (less is better).
#
#		CBC en-/decrypt	CTR	XTS
# POWER8[le]	3.96/0.72	0.74	1.1
# POWER8[be]	3.75/0.65	0.66	1.0

$flavour = shift;

if ($flavour =~ /64/) {
	$SIZE_T	=8;
	$LRSAVE	=2*$SIZE_T;
	$STU	="stdu";
	$POP	="ld";
	$PUSH	="std";
	$UCMP	="cmpld";
	$SHL	="sldi";
} elsif ($flavour =~ /32/) {
	$SIZE_T	=4;
	$LRSAVE	=$SIZE_T;
	$STU	="stwu";
	$POP	="lwz";
	$PUSH	="stw";
	$UCMP	="cmplw";
	$SHL	="slwi";
} else { die "nonsense $flavour"; }

$LITTLE_ENDIAN = ($flavour=~/le$/) ? $SIZE_T : 0;

$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
( $xlate="${dir}ppc-xlate.pl" and -f $xlate ) or
( $xlate="${dir}../../perlasm/ppc-xlate.pl" and -f $xlate) or
die "can't locate ppc-xlate.pl";

open STDOUT,"| $^X $xlate $flavour ".shift || die "can't call $xlate: $!";

$FRAME=8*$SIZE_T;
$prefix="aes_p8";

$sp="r1";
$vrsave="r12";

#########################################################################
{{{	# Key setup procedures						#
my ($inp,$bits,$out,$ptr,$cnt,$rounds)=map("r$_",(3..8));
my ($zero,$in0,$in1,$key,$rcon,$mask,$tmp)=map("v$_",(0..6));
my ($stage,$outperm,$outmask,$outhead,$outtail)=map("v$_",(7..11));

$code.=<<___;
.machine	"any"

.text

.align	7
rcon:
.long	0x01000000, 0x01000000, 0x01000000, 0x01000000	?rev
.long	0x1b000000, 0x1b000000, 0x1b000000, 0x1b000000	?rev
.long	0x0d0e0f0c, 0x0d0e0f0c, 0x0d0e0f0c, 0x0d0e0f0c	?rev
.long	0,0,0,0						?asis
.long	0x0f102132, 0x43546576, 0x8798a9ba, 0xcbdcedfe
Lconsts:
	mflr	r0
	bcl	20,31,\$+4
	mflr	$ptr	 #vvvvv "distance between . and rcon
	addi	$ptr,$ptr,-0x58
	mtlr	r0
	blr
	.long	0
	.byte	0,12,0x14,0,0,0,0,0
.asciz	"AES for PowerISA 2.07, CRYPTOGAMS by <appro\@openssl.org>"

.globl	.${prefix}_set_encrypt_key
Lset_encrypt_key:
	mflr		r11
	$PUSH		r11,$LRSAVE($sp)

	li		$ptr,-1
	${UCMP}i	$inp,0
	beq-		Lenc_key_abort		# if ($inp==0) return -1;
	${UCMP}i	$out,0
	beq-		Lenc_key_abort		# if ($out==0) return -1;
	li		$ptr,-2
	cmpwi		$bits,128
	blt-		Lenc_key_abort
	cmpwi		$bits,256
	bgt-		Lenc_key_abort
	andi.		r0,$bits,0x3f
	bne-		Lenc_key_abort

	lis		r0,0xfff0
	mfspr		$vrsave,256
	mtspr		256,r0

	bl		Lconsts
	mtlr		r11

	neg		r9,$inp
	lvx		$in0,0,$inp
	addi		$inp,$inp,15		# 15 is not typo
	lvsr		$key,0,r9		# borrow $key
	li		r8,0x20
	cmpwi		$bits,192
	lvx		$in1,0,$inp
	le?vspltisb	$mask,0x0f		# borrow $mask
	lvx		$rcon,0,$ptr
	le?vxor		$key,$key,$mask		# adjust for byte swap
	lvx		$mask,r8,$ptr
	addi		$ptr,$ptr,0x10
	vperm		$in0,$in0,$in1,$key	# align [and byte swap in LE]
	li		$cnt,8
	vxor		$zero,$zero,$zero
	mtctr		$cnt

	?lvsr		$outperm,0,$out
	vspltisb	$outmask,-1
	lvx		$outhead,0,$out
	?vperm		$outmask,$zero,$outmask,$outperm

	blt		Loop128
	addi		$inp,$inp,8
	beq		L192
	addi		$inp,$inp,8
	b		L256

.align	4
Loop128:
	vperm		$key,$in0,$in0,$mask	# rotate-n-splat
	vsldoi		$tmp,$zero,$in0,12	# >>32
	 vperm		$outtail,$in0,$in0,$outperm	# rotate
	 vsel		$stage,$outhead,$outtail,$outmask
	 vmr		$outhead,$outtail
	vcipherlast	$key,$key,$rcon
	 stvx		$stage,0,$out
	 addi		$out,$out,16

	vxor		$in0,$in0,$tmp
	vsldoi		$tmp,$zero,$tmp,12	# >>32
	vxor		$in0,$in0,$tmp
	vsldoi		$tmp,$zero,$tmp,12	# >>32
	vxor		$in0,$in0,$tmp
	 vadduwm	$rcon,$rcon,$rcon
	vxor		$in0,$in0,$key
	bdnz		Loop128

	lvx		$rcon,0,$ptr		# last two round keys

	vperm		$key,$in0,$in0,$mask	# rotate-n-splat
	vsldoi		$tmp,$zero,$in0,12	# >>32
	 vperm		$outtail,$in0,$in0,$outperm	# rotate
	 vsel		$stage,$outhead,$outtail,$outmask
	 vmr		$outhead,$outtail
	vcipherlast	$key,$key,$rcon
	 stvx		$stage,0,$out
	 addi		$out,$out,16

	vxor		$in0,$in0,$tmp
	vsldoi		$tmp,$zero,$tmp,12	# >>32
	vxor		$in0,$in0,$tmp
	vsldoi		$tmp,$zero,$tmp,12	# >>32
	vxor		$in0,$in0,$tmp
	 vadduwm	$rcon,$rcon,$rcon
	vxor		$in0,$in0,$key

	vperm		$key,$in0,$in0,$mask	# rotate-n-splat
	vsldoi		$tmp,$zero,$in0,12	# >>32
	 vperm		$outtail,$in0,$in0,$outperm	# rotate
	 vsel		$stage,$outhead,$outtail,$outmask
	 vmr		$outhead,$outtail
	vcipherlast	$key,$key,$rcon
	 stvx		$stage,0,$out
	 addi		$out,$out,16

	vxor		$in0,$in0,$tmp
	vsldoi		$tmp,$zero,$tmp,12	# >>32
	vxor		$in0,$in0,$tmp
	vsldoi		$tmp,$zero,$tmp,12	# >>32
	vxor		$in0,$in0,$tmp
	vxor		$in0,$in0,$key
	 vperm		$outtail,$in0,$in0,$outperm	# rotate
	 vsel		$stage,$outhead,$outtail,$outmask
	 vmr		$outhead,$outtail
	 stvx		$stage,0,$out

	addi		$inp,$out,15		# 15 is not typo
	addi		$out,$out,0x50

	li		$rounds,10
	b		Ldone

.align	4
L192:
	lvx		$tmp,0,$inp
	li		$cnt,4
	 vperm		$outtail,$in0,$in0,$outperm	# rotate
	 vsel		$stage,$outhead,$outtail,$outmask
	 vmr		$outhead,$outtail
	 stvx		$stage,0,$out
	 addi		$out,$out,16
	vperm		$in1,$in1,$tmp,$key	# align [and byte swap in LE]
	vspltisb	$key,8			# borrow $key
	mtctr		$cnt
	vsububm		$mask,$mask,$key	# adjust the mask

Loop192:
	vperm		$key,$in1,$in1,$mask	# roate-n-splat
	vsldoi		$tmp,$zero,$in0,12	# >>32
	vcipherlast	$key,$key,$rcon

	vxor		$in0,$in0,$tmp
	vsldoi		$tmp,$zero,$tmp,12	# >>32
	vxor		$in0,$in0,$tmp
	vsldoi		$tmp,$zero,$tmp,12	# >>32
	vxor		$in0,$in0,$tmp

	 vsldoi		$stage,$zero,$in1,8
	vspltw		$tmp,$in0,3
	vxor		$tmp,$tmp,$in1
	vsldoi		$in1,$zero,$in1,12	# >>32
	 vadduwm	$rcon,$rcon,$rcon
	vxor		$in1,$in1,$tmp
	vxor		$in0,$in0,$key
	vxor		$in1,$in1,$key
	 vsldoi		$stage,$stage,$in0,8

	vperm		$key,$in1,$in1,$mask	# rotate-n-splat
	vsldoi		$tmp,$zero,$in0,12	# >>32
	 vperm		$outtail,$stage,$stage,$outperm	# rotate
	 vsel		$stage,$outhead,$outtail,$outmask
	 vmr		$outhead,$outtail
	vcipherlast	$key,$key,$rcon
	 stvx		$stage,0,$out
	 addi		$out,$out,16

	 vsldoi		$stage,$in0,$in1,8
	vxor		$in0,$in0,$tmp
	vsldoi		$tmp,$zero,$tmp,12	# >>32
	 vperm		$outtail,$stage,$stage,$outperm	# rotate
	 vsel		$stage,$outhead,$outtail,$outmask
	 vmr		$outhead,$outtail
	vxor		$in0,$in0,$tmp
	vsldoi		$tmp,$zero,$tmp,12	# >>32
	vxor		$in0,$in0,$tmp
	 stvx		$stage,0,$out
	 addi		$out,$out,16

	vspltw		$tmp,$in0,3
	vxor		$tmp,$tmp,$in1
	vsldoi		$in1,$zero,$in1,12	# >>32
	 vadduwm	$rcon,$rcon,$rcon
	vxor		$in1,$in1,$tmp
	vxor		$in0,$in0,$key
	vxor		$in1,$in1,$key
	 vperm		$outtail,$in0,$in0,$outperm	# rotate
	 vsel		$stage,$outhead,$outtail,$outmask
	 vmr		$outhead,$outtail
	 stvx		$stage,0,$out
	 addi		$inp,$out,15		# 15 is not typo
	 addi		$out,$out,16
	bdnz		Loop192

	li		$rounds,12
	addi		$out,$out,0x20
	b		Ldone

.align	4
L256:
	lvx		$tmp,0,$inp
	li		$cnt,7
	li		$rounds,14
	 vperm		$outtail,$in0,$in0,$outperm	# rotate
	 vsel		$stage,$outhead,$outtail,$outmask
	 vmr		$outhead,$outtail
	 stvx		$stage,0,$out
	 addi		$out,$out,16
	vperm		$in1,$in1,$tmp,$key	# align [and byte swap in LE]
	mtctr		$cnt

Loop256:
	vperm		$key,$in1,$in1,$mask	# rotate-n-splat
	vsldoi		$tmp,$zero,$in0,12	# >>32
	 vperm		$outtail,$in1,$in1,$outperm	# rotate
	 vsel		$stage,$outhead,$outtail,$outmask
	 vmr		$outhead,$outtail
	vcipherlast	$key,$key,$rcon
	 stvx		$stage,0,$out
	 addi		$out,$out,16

	vxor		$in0,$in0,$tmp
	vsldoi		$tmp,$zero,$tmp,12	# >>32
	vxor		$in0,$in0,$tmp
	vsldoi		$tmp,$zero,$tmp,12	# >>32
	vxor		$in0,$in0,$tmp
	 vadduwm	$rcon,$rcon,$rcon
	vxor		$in0,$in0,$key
	 vperm		$outtail,$in0,$in0,$outperm	# rotate
	 vsel		$stage,$outhead,$outtail,$outmask
	 vmr		$outhead,$outtail
	 stvx		$stage,0,$out
	 addi		$inp,$out,15		# 15 is not typo
	 addi		$out,$out,16
	bdz		Ldone

	vspltw		$key,$in0,3		# just splat
	vsldoi		$tmp,$zero,$in1,12	# >>32
	vsbox		$key,$key

	vxor		$in1,$in1,$tmp
	vsldoi		$tmp,$zero,$tmp,12	# >>32
	vxor		$in1,$in1,$tmp
	vsldoi		$tmp,$zero,$tmp,12	# >>32
	vxor		$in1,$in1,$tmp

	vxor		$in1,$in1,$key
	b		Loop256

.align	4
Ldone:
	lvx		$in1,0,$inp		# redundant in aligned case
	vsel		$in1,$outhead,$in1,$outmask
	stvx		$in1,0,$inp
	li		$ptr,0
	mtspr		256,$vrsave
	stw		$rounds,0($out)

Lenc_key_abort:
	mr		r3,$ptr
	blr
	.long		0
	.byte		0,12,0x14,1,0,0,3,0
	.long		0
.size	.${prefix}_set_encrypt_key,.-.${prefix}_set_encrypt_key

.globl	.${prefix}_set_decrypt_key
	$STU		$sp,-$FRAME($sp)
	mflr		r10
	$PUSH		r10,$FRAME+$LRSAVE($sp)
	bl		Lset_encrypt_key
	mtlr		r10

	cmpwi		r3,0
	bne-		Ldec_key_abort

	slwi		$cnt,$rounds,4
	subi		$inp,$out,240		# first round key
	srwi		$rounds,$rounds,1
	add		$out,$inp,$cnt		# last round key
	mtctr		$rounds

Ldeckey:
	lwz		r0, 0($inp)
	lwz		r6, 4($inp)
	lwz		r7, 8($inp)
	lwz		r8, 12($inp)
	addi		$inp,$inp,16
	lwz		r9, 0($out)
	lwz		r10,4($out)
	lwz		r11,8($out)
	lwz		r12,12($out)
	stw		r0, 0($out)
	stw		r6, 4($out)
	stw		r7, 8($out)
	stw		r8, 12($out)
	subi		$out,$out,16
	stw		r9, -16($inp)
	stw		r10,-12($inp)
	stw		r11,-8($inp)
	stw		r12,-4($inp)
	bdnz		Ldeckey

	xor		r3,r3,r3		# return value
Ldec_key_abort:
	addi		$sp,$sp,$FRAME
	blr
	.long		0
	.byte		0,12,4,1,0x80,0,3,0
	.long		0
.size	.${prefix}_set_decrypt_key,.-.${prefix}_set_decrypt_key
___
}}}
#########################################################################
{{{	# Single block en- and decrypt procedures			#
sub gen_block () {
my $dir = shift;
my $n   = $dir eq "de" ? "n" : "";
my ($inp,$out,$key,$rounds,$idx)=map("r$_",(3..7));

$code.=<<___;
.globl	.${prefix}_${dir}crypt
	lwz		$rounds,240($key)
	lis		r0,0xfc00
	mfspr		$vrsave,256
	li		$idx,15			# 15 is not typo
	mtspr		256,r0

	lvx		v0,0,$inp
	neg		r11,$out
	lvx		v1,$idx,$inp
	lvsl		v2,0,$inp		# inpperm
	le?vspltisb	v4,0x0f
	?lvsl		v3,0,r11		# outperm
	le?vxor		v2,v2,v4
	li		$idx,16
	vperm		v0,v0,v1,v2		# align [and byte swap in LE]
	lvx		v1,0,$key
	?lvsl		v5,0,$key		# keyperm
	srwi		$rounds,$rounds,1
	lvx		v2,$idx,$key
	addi		$idx,$idx,16
	subi		$rounds,$rounds,1
	?vperm		v1,v1,v2,v5		# align round key

	vxor		v0,v0,v1
	lvx		v1,$idx,$key
	addi		$idx,$idx,16
	mtctr		$rounds

Loop_${dir}c:
	?vperm		v2,v2,v1,v5
	v${n}cipher	v0,v0,v2
	lvx		v2,$idx,$key
	addi		$idx,$idx,16
	?vperm		v1,v1,v2,v5
	v${n}cipher	v0,v0,v1
	lvx		v1,$idx,$key
	addi		$idx,$idx,16
	bdnz		Loop_${dir}c

	?vperm		v2,v2,v1,v5
	v${n}cipher	v0,v0,v2
	lvx		v2,$idx,$key
	?vperm		v1,v1,v2,v5
	v${n}cipherlast	v0,v0,v1

	vspltisb	v2,-1
	vxor		v1,v1,v1
	li		$idx,15			# 15 is not typo
	?vperm		v2,v1,v2,v3		# outmask
	le?vxor		v3,v3,v4
	lvx		v1,0,$out		# outhead
	vperm		v0,v0,v0,v3		# rotate [and byte swap in LE]
	vsel		v1,v1,v0,v2
	lvx		v4,$idx,$out
	stvx		v1,0,$out
	vsel		v0,v0,v4,v2
	stvx		v0,$idx,$out

	mtspr		256,$vrsave
	blr
	.long		0
	.byte		0,12,0x14,0,0,0,3,0
	.long		0
.size	.${prefix}_${dir}crypt,.-.${prefix}_${dir}crypt
___
}
&gen_block("en");
&gen_block("de");
}}}
#########################################################################
{{{	# CBC en- and decrypt procedures				#
my ($inp,$out,$len,$key,$ivp,$enc,$rounds,$idx)=map("r$_",(3..10));
my ($rndkey0,$rndkey1,$inout,$tmp)=		map("v$_",(0..3));
my ($ivec,$inptail,$inpperm,$outhead,$outperm,$outmask,$keyperm)=
						map("v$_",(4..10));
$code.=<<___;
.globl	.${prefix}_cbc_encrypt
	${UCMP}i	$len,16
	bltlr-

	cmpwi		$enc,0			# test direction
	lis		r0,0xffe0
	mfspr		$vrsave,256
	mtspr		256,r0

	li		$idx,15
	vxor		$rndkey0,$rndkey0,$rndkey0
	le?vspltisb	$tmp,0x0f

	lvx		$ivec,0,$ivp		# load [unaligned] iv
	lvsl		$inpperm,0,$ivp
	lvx		$inptail,$idx,$ivp
	le?vxor		$inpperm,$inpperm,$tmp
	vperm		$ivec,$ivec,$inptail,$inpperm

	neg		r11,$inp
	?lvsl		$keyperm,0,$key		# prepare for unaligned key
	lwz		$rounds,240($key)

	lvsr		$inpperm,0,r11		# prepare for unaligned load
	lvx		$inptail,0,$inp
	addi		$inp,$inp,15		# 15 is not typo
	le?vxor		$inpperm,$inpperm,$tmp

	?lvsr		$outperm,0,$out		# prepare for unaligned store
	vspltisb	$outmask,-1
	lvx		$outhead,0,$out
	?vperm		$outmask,$rndkey0,$outmask,$outperm
	le?vxor		$outperm,$outperm,$tmp

	srwi		$rounds,$rounds,1
	li		$idx,16
	subi		$rounds,$rounds,1
	beq		Lcbc_dec

Lcbc_enc:
	vmr		$inout,$inptail
	lvx		$inptail,0,$inp
	addi		$inp,$inp,16
	mtctr		$rounds
	subi		$len,$len,16		# len-=16

	lvx		$rndkey0,0,$key
	 vperm		$inout,$inout,$inptail,$inpperm
	lvx		$rndkey1,$idx,$key
	addi		$idx,$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vxor		$inout,$inout,$rndkey0
	lvx		$rndkey0,$idx,$key
	addi		$idx,$idx,16
	vxor		$inout,$inout,$ivec

Loop_cbc_enc:
	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vcipher		$inout,$inout,$rndkey1
	lvx		$rndkey1,$idx,$key
	addi		$idx,$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vcipher		$inout,$inout,$rndkey0
	lvx		$rndkey0,$idx,$key
	addi		$idx,$idx,16
	bdnz		Loop_cbc_enc

	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vcipher		$inout,$inout,$rndkey1
	lvx		$rndkey1,$idx,$key
	li		$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vcipherlast	$ivec,$inout,$rndkey0
	${UCMP}i	$len,16

	vperm		$tmp,$ivec,$ivec,$outperm
	vsel		$inout,$outhead,$tmp,$outmask
	vmr		$outhead,$tmp
	stvx		$inout,0,$out
	addi		$out,$out,16
	bge		Lcbc_enc

	b		Lcbc_done

.align	4
Lcbc_dec:
	${UCMP}i	$len,128
	bge		_aesp8_cbc_decrypt8x
	vmr		$tmp,$inptail
	lvx		$inptail,0,$inp
	addi		$inp,$inp,16
	mtctr		$rounds
	subi		$len,$len,16		# len-=16

	lvx		$rndkey0,0,$key
	 vperm		$tmp,$tmp,$inptail,$inpperm
	lvx		$rndkey1,$idx,$key
	addi		$idx,$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vxor		$inout,$tmp,$rndkey0
	lvx		$rndkey0,$idx,$key
	addi		$idx,$idx,16

Loop_cbc_dec:
	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vncipher	$inout,$inout,$rndkey1
	lvx		$rndkey1,$idx,$key
	addi		$idx,$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vncipher	$inout,$inout,$rndkey0
	lvx		$rndkey0,$idx,$key
	addi		$idx,$idx,16
	bdnz		Loop_cbc_dec

	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vncipher	$inout,$inout,$rndkey1
	lvx		$rndkey1,$idx,$key
	li		$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vncipherlast	$inout,$inout,$rndkey0
	${UCMP}i	$len,16

	vxor		$inout,$inout,$ivec
	vmr		$ivec,$tmp
	vperm		$tmp,$inout,$inout,$outperm
	vsel		$inout,$outhead,$tmp,$outmask
	vmr		$outhead,$tmp
	stvx		$inout,0,$out
	addi		$out,$out,16
	bge		Lcbc_dec

Lcbc_done:
	addi		$out,$out,-1
	lvx		$inout,0,$out		# redundant in aligned case
	vsel		$inout,$outhead,$inout,$outmask
	stvx		$inout,0,$out

	neg		$enc,$ivp		# write [unaligned] iv
	li		$idx,15			# 15 is not typo
	vxor		$rndkey0,$rndkey0,$rndkey0
	vspltisb	$outmask,-1
	le?vspltisb	$tmp,0x0f
	?lvsl		$outperm,0,$enc
	?vperm		$outmask,$rndkey0,$outmask,$outperm
	le?vxor		$outperm,$outperm,$tmp
	lvx		$outhead,0,$ivp
	vperm		$ivec,$ivec,$ivec,$outperm
	vsel		$inout,$outhead,$ivec,$outmask
	lvx		$inptail,$idx,$ivp
	stvx		$inout,0,$ivp
	vsel		$inout,$ivec,$inptail,$outmask
	stvx		$inout,$idx,$ivp

	mtspr		256,$vrsave
	blr
	.long		0
	.byte		0,12,0x14,0,0,0,6,0
	.long		0
___
#########################################################################
{{	# Optimized CBC decrypt procedure				#
my $key_="r11";
my ($x00,$x10,$x20,$x30,$x40,$x50,$x60,$x70)=map("r$_",(0,8,26..31));
my ($in0, $in1, $in2, $in3, $in4, $in5, $in6, $in7 )=map("v$_",(0..3,10..13));
my ($out0,$out1,$out2,$out3,$out4,$out5,$out6,$out7)=map("v$_",(14..21));
my $rndkey0="v23";	# v24-v25 rotating buffer for first found keys
			# v26-v31 last 6 round keys
my ($tmp,$keyperm)=($in3,$in4);	# aliases with "caller", redundant assignment

$code.=<<___;
.align	5
_aesp8_cbc_decrypt8x:
	$STU		$sp,-`($FRAME+21*16+6*$SIZE_T)`($sp)
	li		r10,`$FRAME+8*16+15`
	li		r11,`$FRAME+8*16+31`
	stvx		v20,r10,$sp		# ABI says so
	addi		r10,r10,32
	stvx		v21,r11,$sp
	addi		r11,r11,32
	stvx		v22,r10,$sp
	addi		r10,r10,32
	stvx		v23,r11,$sp
	addi		r11,r11,32
	stvx		v24,r10,$sp
	addi		r10,r10,32
	stvx		v25,r11,$sp
	addi		r11,r11,32
	stvx		v26,r10,$sp
	addi		r10,r10,32
	stvx		v27,r11,$sp
	addi		r11,r11,32
	stvx		v28,r10,$sp
	addi		r10,r10,32
	stvx		v29,r11,$sp
	addi		r11,r11,32
	stvx		v30,r10,$sp
	stvx		v31,r11,$sp
	li		r0,-1
	stw		$vrsave,`$FRAME+21*16-4`($sp)	# save vrsave
	li		$x10,0x10
	$PUSH		r26,`$FRAME+21*16+0*$SIZE_T`($sp)
	li		$x20,0x20
	$PUSH		r27,`$FRAME+21*16+1*$SIZE_T`($sp)
	li		$x30,0x30
	$PUSH		r28,`$FRAME+21*16+2*$SIZE_T`($sp)
	li		$x40,0x40
	$PUSH		r29,`$FRAME+21*16+3*$SIZE_T`($sp)
	li		$x50,0x50
	$PUSH		r30,`$FRAME+21*16+4*$SIZE_T`($sp)
	li		$x60,0x60
	$PUSH		r31,`$FRAME+21*16+5*$SIZE_T`($sp)
	li		$x70,0x70
	mtspr		256,r0

	subi		$rounds,$rounds,3	# -4 in total
	subi		$len,$len,128		# bias

	lvx		$rndkey0,$x00,$key	# load key schedule
	lvx		v30,$x10,$key
	addi		$key,$key,0x20
	lvx		v31,$x00,$key
	?vperm		$rndkey0,$rndkey0,v30,$keyperm
	addi		$key_,$sp,$FRAME+15
	mtctr		$rounds

Load_cbc_dec_key:
	?vperm		v24,v30,v31,$keyperm
	lvx		v30,$x10,$key
	addi		$key,$key,0x20
	stvx		v24,$x00,$key_		# off-load round[1]
	?vperm		v25,v31,v30,$keyperm
	lvx		v31,$x00,$key
	stvx		v25,$x10,$key_		# off-load round[2]
	addi		$key_,$key_,0x20
	bdnz		Load_cbc_dec_key

	lvx		v26,$x10,$key
	?vperm		v24,v30,v31,$keyperm
	lvx		v27,$x20,$key
	stvx		v24,$x00,$key_		# off-load round[3]
	?vperm		v25,v31,v26,$keyperm
	lvx		v28,$x30,$key
	stvx		v25,$x10,$key_		# off-load round[4]
	addi		$key_,$sp,$FRAME+15	# rewind $key_
	?vperm		v26,v26,v27,$keyperm
	lvx		v29,$x40,$key
	?vperm		v27,v27,v28,$keyperm
	lvx		v30,$x50,$key
	?vperm		v28,v28,v29,$keyperm
	lvx		v31,$x60,$key
	?vperm		v29,v29,v30,$keyperm
	lvx		$out0,$x70,$key		# borrow $out0
	?vperm		v30,v30,v31,$keyperm
	lvx		v24,$x00,$key_		# pre-load round[1]
	?vperm		v31,v31,$out0,$keyperm
	lvx		v25,$x10,$key_		# pre-load round[2]

	#lvx		$inptail,0,$inp		# "caller" already did this
	#addi		$inp,$inp,15		# 15 is not typo
	subi		$inp,$inp,15		# undo "caller"

	 le?li		$idx,8
	lvx_u		$in0,$x00,$inp		# load first 8 "words"
	 le?lvsl	$inpperm,0,$idx
	 le?vspltisb	$tmp,0x0f
	lvx_u		$in1,$x10,$inp
	 le?vxor	$inpperm,$inpperm,$tmp	# transform for lvx_u/stvx_u
	lvx_u		$in2,$x20,$inp
	 le?vperm	$in0,$in0,$in0,$inpperm
	lvx_u		$in3,$x30,$inp
	 le?vperm	$in1,$in1,$in1,$inpperm
	lvx_u		$in4,$x40,$inp
	 le?vperm	$in2,$in2,$in2,$inpperm
	vxor		$out0,$in0,$rndkey0
	lvx_u		$in5,$x50,$inp
	 le?vperm	$in3,$in3,$in3,$inpperm
	vxor		$out1,$in1,$rndkey0
	lvx_u		$in6,$x60,$inp
	 le?vperm	$in4,$in4,$in4,$inpperm
	vxor		$out2,$in2,$rndkey0
	lvx_u		$in7,$x70,$inp
	addi		$inp,$inp,0x80
	 le?vperm	$in5,$in5,$in5,$inpperm
	vxor		$out3,$in3,$rndkey0
	 le?vperm	$in6,$in6,$in6,$inpperm
	vxor		$out4,$in4,$rndkey0
	 le?vperm	$in7,$in7,$in7,$inpperm
	vxor		$out5,$in5,$rndkey0
	vxor		$out6,$in6,$rndkey0
	vxor		$out7,$in7,$rndkey0

	mtctr		$rounds
	b		Loop_cbc_dec8x
.align	5
Loop_cbc_dec8x:
	vncipher	$out0,$out0,v24
	vncipher	$out1,$out1,v24
	vncipher	$out2,$out2,v24
	vncipher	$out3,$out3,v24
	vncipher	$out4,$out4,v24
	vncipher	$out5,$out5,v24
	vncipher	$out6,$out6,v24
	vncipher	$out7,$out7,v24
	lvx		v24,$x20,$key_		# round[3]
	addi		$key_,$key_,0x20

	vncipher	$out0,$out0,v25
	vncipher	$out1,$out1,v25
	vncipher	$out2,$out2,v25
	vncipher	$out3,$out3,v25
	vncipher	$out4,$out4,v25
	vncipher	$out5,$out5,v25
	vncipher	$out6,$out6,v25
	vncipher	$out7,$out7,v25
	lvx		v25,$x10,$key_		# round[4]
	bdnz		Loop_cbc_dec8x

	subic		$len,$len,128		# $len-=128
	vncipher	$out0,$out0,v24
	vncipher	$out1,$out1,v24
	vncipher	$out2,$out2,v24
	vncipher	$out3,$out3,v24
	vncipher	$out4,$out4,v24
	vncipher	$out5,$out5,v24
	vncipher	$out6,$out6,v24
	vncipher	$out7,$out7,v24

	subfe.		r0,r0,r0		# borrow?-1:0
	vncipher	$out0,$out0,v25
	vncipher	$out1,$out1,v25
	vncipher	$out2,$out2,v25
	vncipher	$out3,$out3,v25
	vncipher	$out4,$out4,v25
	vncipher	$out5,$out5,v25
	vncipher	$out6,$out6,v25
	vncipher	$out7,$out7,v25

	and		r0,r0,$len
	vncipher	$out0,$out0,v26
	vncipher	$out1,$out1,v26
	vncipher	$out2,$out2,v26
	vncipher	$out3,$out3,v26
	vncipher	$out4,$out4,v26
	vncipher	$out5,$out5,v26
	vncipher	$out6,$out6,v26
	vncipher	$out7,$out7,v26

	add		$inp,$inp,r0		# $inp is adjusted in such
						# way that at exit from the
						# loop inX-in7 are loaded
						# with last "words"
	vncipher	$out0,$out0,v27
	vncipher	$out1,$out1,v27
	vncipher	$out2,$out2,v27
	vncipher	$out3,$out3,v27
	vncipher	$out4,$out4,v27
	vncipher	$out5,$out5,v27
	vncipher	$out6,$out6,v27
	vncipher	$out7,$out7,v27

	addi		$key_,$sp,$FRAME+15	# rewind $key_
	vncipher	$out0,$out0,v28
	vncipher	$out1,$out1,v28
	vncipher	$out2,$out2,v28
	vncipher	$out3,$out3,v28
	vncipher	$out4,$out4,v28
	vncipher	$out5,$out5,v28
	vncipher	$out6,$out6,v28
	vncipher	$out7,$out7,v28
	lvx		v24,$x00,$key_		# re-pre-load round[1]

	vncipher	$out0,$out0,v29
	vncipher	$out1,$out1,v29
	vncipher	$out2,$out2,v29
	vncipher	$out3,$out3,v29
	vncipher	$out4,$out4,v29
	vncipher	$out5,$out5,v29
	vncipher	$out6,$out6,v29
	vncipher	$out7,$out7,v29
	lvx		v25,$x10,$key_		# re-pre-load round[2]

	vncipher	$out0,$out0,v30
	 vxor		$ivec,$ivec,v31		# xor with last round key
	vncipher	$out1,$out1,v30
	 vxor		$in0,$in0,v31
	vncipher	$out2,$out2,v30
	 vxor		$in1,$in1,v31
	vncipher	$out3,$out3,v30
	 vxor		$in2,$in2,v31
	vncipher	$out4,$out4,v30
	 vxor		$in3,$in3,v31
	vncipher	$out5,$out5,v30
	 vxor		$in4,$in4,v31
	vncipher	$out6,$out6,v30
	 vxor		$in5,$in5,v31
	vncipher	$out7,$out7,v30
	 vxor		$in6,$in6,v31

	vncipherlast	$out0,$out0,$ivec
	vncipherlast	$out1,$out1,$in0
	 lvx_u		$in0,$x00,$inp		# load next input block
	vncipherlast	$out2,$out2,$in1
	 lvx_u		$in1,$x10,$inp
	vncipherlast	$out3,$out3,$in2
	 le?vperm	$in0,$in0,$in0,$inpperm
	 lvx_u		$in2,$x20,$inp
	vncipherlast	$out4,$out4,$in3
	 le?vperm	$in1,$in1,$in1,$inpperm
	 lvx_u		$in3,$x30,$inp
	vncipherlast	$out5,$out5,$in4
	 le?vperm	$in2,$in2,$in2,$inpperm
	 lvx_u		$in4,$x40,$inp
	vncipherlast	$out6,$out6,$in5
	 le?vperm	$in3,$in3,$in3,$inpperm
	 lvx_u		$in5,$x50,$inp
	vncipherlast	$out7,$out7,$in6
	 le?vperm	$in4,$in4,$in4,$inpperm
	 lvx_u		$in6,$x60,$inp
	vmr		$ivec,$in7
	 le?vperm	$in5,$in5,$in5,$inpperm
	 lvx_u		$in7,$x70,$inp
	 addi		$inp,$inp,0x80

	le?vperm	$out0,$out0,$out0,$inpperm
	le?vperm	$out1,$out1,$out1,$inpperm
	stvx_u		$out0,$x00,$out
	 le?vperm	$in6,$in6,$in6,$inpperm
	 vxor		$out0,$in0,$rndkey0
	le?vperm	$out2,$out2,$out2,$inpperm
	stvx_u		$out1,$x10,$out
	 le?vperm	$in7,$in7,$in7,$inpperm
	 vxor		$out1,$in1,$rndkey0
	le?vperm	$out3,$out3,$out3,$inpperm
	stvx_u		$out2,$x20,$out
	 vxor		$out2,$in2,$rndkey0
	le?vperm	$out4,$out4,$out4,$inpperm
	stvx_u		$out3,$x30,$out
	 vxor		$out3,$in3,$rndkey0
	le?vperm	$out5,$out5,$out5,$inpperm
	stvx_u		$out4,$x40,$out
	 vxor		$out4,$in4,$rndkey0
	le?vperm	$out6,$out6,$out6,$inpperm
	stvx_u		$out5,$x50,$out
	 vxor		$out5,$in5,$rndkey0
	le?vperm	$out7,$out7,$out7,$inpperm
	stvx_u		$out6,$x60,$out
	 vxor		$out6,$in6,$rndkey0
	stvx_u		$out7,$x70,$out
	addi		$out,$out,0x80
	 vxor		$out7,$in7,$rndkey0

	mtctr		$rounds
	beq		Loop_cbc_dec8x		# did $len-=128 borrow?

	addic.		$len,$len,128
	beq		Lcbc_dec8x_done
	nop
	nop

Loop_cbc_dec8x_tail:				# up to 7 "words" tail...
	vncipher	$out1,$out1,v24
	vncipher	$out2,$out2,v24
	vncipher	$out3,$out3,v24
	vncipher	$out4,$out4,v24
	vncipher	$out5,$out5,v24
	vncipher	$out6,$out6,v24
	vncipher	$out7,$out7,v24
	lvx		v24,$x20,$key_		# round[3]
	addi		$key_,$key_,0x20

	vncipher	$out1,$out1,v25
	vncipher	$out2,$out2,v25
	vncipher	$out3,$out3,v25
	vncipher	$out4,$out4,v25
	vncipher	$out5,$out5,v25
	vncipher	$out6,$out6,v25
	vncipher	$out7,$out7,v25
	lvx		v25,$x10,$key_		# round[4]
	bdnz		Loop_cbc_dec8x_tail

	vncipher	$out1,$out1,v24
	vncipher	$out2,$out2,v24
	vncipher	$out3,$out3,v24
	vncipher	$out4,$out4,v24
	vncipher	$out5,$out5,v24
	vncipher	$out6,$out6,v24
	vncipher	$out7,$out7,v24

	vncipher	$out1,$out1,v25
	vncipher	$out2,$out2,v25
	vncipher	$out3,$out3,v25
	vncipher	$out4,$out4,v25
	vncipher	$out5,$out5,v25
	vncipher	$out6,$out6,v25
	vncipher	$out7,$out7,v25

	vncipher	$out1,$out1,v26
	vncipher	$out2,$out2,v26
	vncipher	$out3,$out3,v26
	vncipher	$out4,$out4,v26
	vncipher	$out5,$out5,v26
	vncipher	$out6,$out6,v26
	vncipher	$out7,$out7,v26

	vncipher	$out1,$out1,v27
	vncipher	$out2,$out2,v27
	vncipher	$out3,$out3,v27
	vncipher	$out4,$out4,v27
	vncipher	$out5,$out5,v27
	vncipher	$out6,$out6,v27
	vncipher	$out7,$out7,v27

	vncipher	$out1,$out1,v28
	vncipher	$out2,$out2,v28
	vncipher	$out3,$out3,v28
	vncipher	$out4,$out4,v28
	vncipher	$out5,$out5,v28
	vncipher	$out6,$out6,v28
	vncipher	$out7,$out7,v28

	vncipher	$out1,$out1,v29
	vncipher	$out2,$out2,v29
	vncipher	$out3,$out3,v29
	vncipher	$out4,$out4,v29
	vncipher	$out5,$out5,v29
	vncipher	$out6,$out6,v29
	vncipher	$out7,$out7,v29

	vncipher	$out1,$out1,v30
	 vxor		$ivec,$ivec,v31		# last round key
	vncipher	$out2,$out2,v30
	 vxor		$in1,$in1,v31
	vncipher	$out3,$out3,v30
	 vxor		$in2,$in2,v31
	vncipher	$out4,$out4,v30
	 vxor		$in3,$in3,v31
	vncipher	$out5,$out5,v30
	 vxor		$in4,$in4,v31
	vncipher	$out6,$out6,v30
	 vxor		$in5,$in5,v31
	vncipher	$out7,$out7,v30
	 vxor		$in6,$in6,v31

	cmplwi		$len,32			# switch($len)
	blt		Lcbc_dec8x_one
	nop
	beq		Lcbc_dec8x_two
	cmplwi		$len,64
	blt		Lcbc_dec8x_three
	nop
	beq		Lcbc_dec8x_four
	cmplwi		$len,96
	blt		Lcbc_dec8x_five
	nop
	beq		Lcbc_dec8x_six

Lcbc_dec8x_seven:
	vncipherlast	$out1,$out1,$ivec
	vncipherlast	$out2,$out2,$in1
	vncipherlast	$out3,$out3,$in2
	vncipherlast	$out4,$out4,$in3
	vncipherlast	$out5,$out5,$in4
	vncipherlast	$out6,$out6,$in5
	vncipherlast	$out7,$out7,$in6
	vmr		$ivec,$in7

	le?vperm	$out1,$out1,$out1,$inpperm
	le?vperm	$out2,$out2,$out2,$inpperm
	stvx_u		$out1,$x00,$out
	le?vperm	$out3,$out3,$out3,$inpperm
	stvx_u		$out2,$x10,$out
	le?vperm	$out4,$out4,$out4,$inpperm
	stvx_u		$out3,$x20,$out
	le?vperm	$out5,$out5,$out5,$inpperm
	stvx_u		$out4,$x30,$out
	le?vperm	$out6,$out6,$out6,$inpperm
	stvx_u		$out5,$x40,$out
	le?vperm	$out7,$out7,$out7,$inpperm
	stvx_u		$out6,$x50,$out
	stvx_u		$out7,$x60,$out
	addi		$out,$out,0x70
	b		Lcbc_dec8x_done

.align	5
Lcbc_dec8x_six:
	vncipherlast	$out2,$out2,$ivec
	vncipherlast	$out3,$out3,$in2
	vncipherlast	$out4,$out4,$in3
	vncipherlast	$out5,$out5,$in4
	vncipherlast	$out6,$out6,$in5
	vncipherlast	$out7,$out7,$in6
	vmr		$ivec,$in7

	le?vperm	$out2,$out2,$out2,$inpperm
	le?vperm	$out3,$out3,$out3,$inpperm
	stvx_u		$out2,$x00,$out
	le?vperm	$out4,$out4,$out4,$inpperm
	stvx_u		$out3,$x10,$out
	le?vperm	$out5,$out5,$out5,$inpperm
	stvx_u		$out4,$x20,$out
	le?vperm	$out6,$out6,$out6,$inpperm
	stvx_u		$out5,$x30,$out
	le?vperm	$out7,$out7,$out7,$inpperm
	stvx_u		$out6,$x40,$out
	stvx_u		$out7,$x50,$out
	addi		$out,$out,0x60
	b		Lcbc_dec8x_done

.align	5
Lcbc_dec8x_five:
	vncipherlast	$out3,$out3,$ivec
	vncipherlast	$out4,$out4,$in3
	vncipherlast	$out5,$out5,$in4
	vncipherlast	$out6,$out6,$in5
	vncipherlast	$out7,$out7,$in6
	vmr		$ivec,$in7

	le?vperm	$out3,$out3,$out3,$inpperm
	le?vperm	$out4,$out4,$out4,$inpperm
	stvx_u		$out3,$x00,$out
	le?vperm	$out5,$out5,$out5,$inpperm
	stvx_u		$out4,$x10,$out
	le?vperm	$out6,$out6,$out6,$inpperm
	stvx_u		$out5,$x20,$out
	le?vperm	$out7,$out7,$out7,$inpperm
	stvx_u		$out6,$x30,$out
	stvx_u		$out7,$x40,$out
	addi		$out,$out,0x50
	b		Lcbc_dec8x_done

.align	5
Lcbc_dec8x_four:
	vncipherlast	$out4,$out4,$ivec
	vncipherlast	$out5,$out5,$in4
	vncipherlast	$out6,$out6,$in5
	vncipherlast	$out7,$out7,$in6
	vmr		$ivec,$in7

	le?vperm	$out4,$out4,$out4,$inpperm
	le?vperm	$out5,$out5,$out5,$inpperm
	stvx_u		$out4,$x00,$out
	le?vperm	$out6,$out6,$out6,$inpperm
	stvx_u		$out5,$x10,$out
	le?vperm	$out7,$out7,$out7,$inpperm
	stvx_u		$out6,$x20,$out
	stvx_u		$out7,$x30,$out
	addi		$out,$out,0x40
	b		Lcbc_dec8x_done

.align	5
Lcbc_dec8x_three:
	vncipherlast	$out5,$out5,$ivec
	vncipherlast	$out6,$out6,$in5
	vncipherlast	$out7,$out7,$in6
	vmr		$ivec,$in7

	le?vperm	$out5,$out5,$out5,$inpperm
	le?vperm	$out6,$out6,$out6,$inpperm
	stvx_u		$out5,$x00,$out
	le?vperm	$out7,$out7,$out7,$inpperm
	stvx_u		$out6,$x10,$out
	stvx_u		$out7,$x20,$out
	addi		$out,$out,0x30
	b		Lcbc_dec8x_done

.align	5
Lcbc_dec8x_two:
	vncipherlast	$out6,$out6,$ivec
	vncipherlast	$out7,$out7,$in6
	vmr		$ivec,$in7

	le?vperm	$out6,$out6,$out6,$inpperm
	le?vperm	$out7,$out7,$out7,$inpperm
	stvx_u		$out6,$x00,$out
	stvx_u		$out7,$x10,$out
	addi		$out,$out,0x20
	b		Lcbc_dec8x_done

.align	5
Lcbc_dec8x_one:
	vncipherlast	$out7,$out7,$ivec
	vmr		$ivec,$in7

	le?vperm	$out7,$out7,$out7,$inpperm
	stvx_u		$out7,0,$out
	addi		$out,$out,0x10

Lcbc_dec8x_done:
	le?vperm	$ivec,$ivec,$ivec,$inpperm
	stvx_u		$ivec,0,$ivp		# write [unaligned] iv

	li		r10,`$FRAME+15`
	li		r11,`$FRAME+31`
	stvx		$inpperm,r10,$sp	# wipe copies of round keys
	addi		r10,r10,32
	stvx		$inpperm,r11,$sp
	addi		r11,r11,32
	stvx		$inpperm,r10,$sp
	addi		r10,r10,32
	stvx		$inpperm,r11,$sp
	addi		r11,r11,32
	stvx		$inpperm,r10,$sp
	addi		r10,r10,32
	stvx		$inpperm,r11,$sp
	addi		r11,r11,32
	stvx		$inpperm,r10,$sp
	addi		r10,r10,32
	stvx		$inpperm,r11,$sp
	addi		r11,r11,32

	mtspr		256,$vrsave
	lvx		v20,r10,$sp		# ABI says so
	addi		r10,r10,32
	lvx		v21,r11,$sp
	addi		r11,r11,32
	lvx		v22,r10,$sp
	addi		r10,r10,32
	lvx		v23,r11,$sp
	addi		r11,r11,32
	lvx		v24,r10,$sp
	addi		r10,r10,32
	lvx		v25,r11,$sp
	addi		r11,r11,32
	lvx		v26,r10,$sp
	addi		r10,r10,32
	lvx		v27,r11,$sp
	addi		r11,r11,32
	lvx		v28,r10,$sp
	addi		r10,r10,32
	lvx		v29,r11,$sp
	addi		r11,r11,32
	lvx		v30,r10,$sp
	lvx		v31,r11,$sp
	$POP		r26,`$FRAME+21*16+0*$SIZE_T`($sp)
	$POP		r27,`$FRAME+21*16+1*$SIZE_T`($sp)
	$POP		r28,`$FRAME+21*16+2*$SIZE_T`($sp)
	$POP		r29,`$FRAME+21*16+3*$SIZE_T`($sp)
	$POP		r30,`$FRAME+21*16+4*$SIZE_T`($sp)
	$POP		r31,`$FRAME+21*16+5*$SIZE_T`($sp)
	addi		$sp,$sp,`$FRAME+21*16+6*$SIZE_T`
	blr
	.long		0
	.byte		0,12,0x14,0,0x80,6,6,0
	.long		0
.size	.${prefix}_cbc_encrypt,.-.${prefix}_cbc_encrypt
___
}}	}}}

#########################################################################
{{{	# CTR procedure[s]						#

####################### WARNING: Here be dragons! #######################
#
# This code is written as 'ctr32', based on a 32-bit counter used
# upstream. The kernel does *not* use a 32-bit counter. The kernel uses
# a 128-bit counter.
#
# This leads to subtle changes from the upstream code: the counter
# is incremented with vaddu_q_m rather than vaddu_w_m. This occurs in
# both the bulk (8 blocks at a time) path, and in the individual block
# path. Be aware of this when doing updates.
#
# See:
# 1d4aa0b4c181 ("crypto: vmx - Fixing AES-CTR counter bug")
# 009b30ac7444 ("crypto: vmx - CTR: always increment IV as quadword")
# https://github.com/openssl/openssl/pull/8942
#
#########################################################################
my ($inp,$out,$len,$key,$ivp,$x10,$rounds,$idx)=map("r$_",(3..10));
my ($rndkey0,$rndkey1,$inout,$tmp)=		map("v$_",(0..3));
my ($ivec,$inptail,$inpperm,$outhead,$outperm,$outmask,$keyperm,$one)=
						map("v$_",(4..11));
my $dat=$tmp;

$code.=<<___;
.globl	.${prefix}_ctr32_encrypt_blocks
	${UCMP}i	$len,1
	bltlr-

	lis		r0,0xfff0
	mfspr		$vrsave,256
	mtspr		256,r0

	li		$idx,15
	vxor		$rndkey0,$rndkey0,$rndkey0
	le?vspltisb	$tmp,0x0f

	lvx		$ivec,0,$ivp		# load [unaligned] iv
	lvsl		$inpperm,0,$ivp
	lvx		$inptail,$idx,$ivp
	 vspltisb	$one,1
	le?vxor		$inpperm,$inpperm,$tmp
	vperm		$ivec,$ivec,$inptail,$inpperm
	 vsldoi		$one,$rndkey0,$one,1

	neg		r11,$inp
	?lvsl		$keyperm,0,$key		# prepare for unaligned key
	lwz		$rounds,240($key)

	lvsr		$inpperm,0,r11		# prepare for unaligned load
	lvx		$inptail,0,$inp
	addi		$inp,$inp,15		# 15 is not typo
	le?vxor		$inpperm,$inpperm,$tmp

	srwi		$rounds,$rounds,1
	li		$idx,16
	subi		$rounds,$rounds,1

	${UCMP}i	$len,8
	bge		_aesp8_ctr32_encrypt8x

	?lvsr		$outperm,0,$out		# prepare for unaligned store
	vspltisb	$outmask,-1
	lvx		$outhead,0,$out
	?vperm		$outmask,$rndkey0,$outmask,$outperm
	le?vxor		$outperm,$outperm,$tmp

	lvx		$rndkey0,0,$key
	mtctr		$rounds
	lvx		$rndkey1,$idx,$key
	addi		$idx,$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vxor		$inout,$ivec,$rndkey0
	lvx		$rndkey0,$idx,$key
	addi		$idx,$idx,16
	b		Loop_ctr32_enc

.align	5
Loop_ctr32_enc:
	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vcipher		$inout,$inout,$rndkey1
	lvx		$rndkey1,$idx,$key
	addi		$idx,$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vcipher		$inout,$inout,$rndkey0
	lvx		$rndkey0,$idx,$key
	addi		$idx,$idx,16
	bdnz		Loop_ctr32_enc

	vadduqm		$ivec,$ivec,$one	# Kernel change for 128-bit
	 vmr		$dat,$inptail
	 lvx		$inptail,0,$inp
	 addi		$inp,$inp,16
	 subic.		$len,$len,1		# blocks--

	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vcipher		$inout,$inout,$rndkey1
	lvx		$rndkey1,$idx,$key
	 vperm		$dat,$dat,$inptail,$inpperm
	 li		$idx,16
	?vperm		$rndkey1,$rndkey0,$rndkey1,$keyperm
	 lvx		$rndkey0,0,$key
	vxor		$dat,$dat,$rndkey1	# last round key
	vcipherlast	$inout,$inout,$dat

	 lvx		$rndkey1,$idx,$key
	 addi		$idx,$idx,16
	vperm		$inout,$inout,$inout,$outperm
	vsel		$dat,$outhead,$inout,$outmask
	 mtctr		$rounds
	 ?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vmr		$outhead,$inout
	 vxor		$inout,$ivec,$rndkey0
	 lvx		$rndkey0,$idx,$key
	 addi		$idx,$idx,16
	stvx		$dat,0,$out
	addi		$out,$out,16
	bne		Loop_ctr32_enc

	addi		$out,$out,-1
	lvx		$inout,0,$out		# redundant in aligned case
	vsel		$inout,$outhead,$inout,$outmask
	stvx		$inout,0,$out

	mtspr		256,$vrsave
	blr
	.long		0
	.byte		0,12,0x14,0,0,0,6,0
	.long		0
___
#########################################################################
{{	# Optimized CTR procedure					#
my $key_="r11";
my ($x00,$x10,$x20,$x30,$x40,$x50,$x60,$x70)=map("r$_",(0,8,26..31));
my ($in0, $in1, $in2, $in3, $in4, $in5, $in6, $in7 )=map("v$_",(0..3,10,12..14));
my ($out0,$out1,$out2,$out3,$out4,$out5,$out6,$out7)=map("v$_",(15..22));
my $rndkey0="v23";	# v24-v25 rotating buffer for first found keys
			# v26-v31 last 6 round keys
my ($tmp,$keyperm)=($in3,$in4);	# aliases with "caller", redundant assignment
my ($two,$three,$four)=($outhead,$outperm,$outmask);

$code.=<<___;
.align	5
_aesp8_ctr32_encrypt8x:
	$STU		$sp,-`($FRAME+21*16+6*$SIZE_T)`($sp)
	li		r10,`$FRAME+8*16+15`
	li		r11,`$FRAME+8*16+31`
	stvx		v20,r10,$sp		# ABI says so
	addi		r10,r10,32
	stvx		v21,r11,$sp
	addi		r11,r11,32
	stvx		v22,r10,$sp
	addi		r10,r10,32
	stvx		v23,r11,$sp
	addi		r11,r11,32
	stvx		v24,r10,$sp
	addi		r10,r10,32
	stvx		v25,r11,$sp
	addi		r11,r11,32
	stvx		v26,r10,$sp
	addi		r10,r10,32
	stvx		v27,r11,$sp
	addi		r11,r11,32
	stvx		v28,r10,$sp
	addi		r10,r10,32
	stvx		v29,r11,$sp
	addi		r11,r11,32
	stvx		v30,r10,$sp
	stvx		v31,r11,$sp
	li		r0,-1
	stw		$vrsave,`$FRAME+21*16-4`($sp)	# save vrsave
	li		$x10,0x10
	$PUSH		r26,`$FRAME+21*16+0*$SIZE_T`($sp)
	li		$x20,0x20
	$PUSH		r27,`$FRAME+21*16+1*$SIZE_T`($sp)
	li		$x30,0x30
	$PUSH		r28,`$FRAME+21*16+2*$SIZE_T`($sp)
	li		$x40,0x40
	$PUSH		r29,`$FRAME+21*16+3*$SIZE_T`($sp)
	li		$x50,0x50
	$PUSH		r30,`$FRAME+21*16+4*$SIZE_T`($sp)
	li		$x60,0x60
	$PUSH		r31,`$FRAME+21*16+5*$SIZE_T`($sp)
	li		$x70,0x70
	mtspr		256,r0

	subi		$rounds,$rounds,3	# -4 in total

	lvx		$rndkey0,$x00,$key	# load key schedule
	lvx		v30,$x10,$key
	addi		$key,$key,0x20
	lvx		v31,$x00,$key
	?vperm		$rndkey0,$rndkey0,v30,$keyperm
	addi		$key_,$sp,$FRAME+15
	mtctr		$rounds

Load_ctr32_enc_key:
	?vperm		v24,v30,v31,$keyperm
	lvx		v30,$x10,$key
	addi		$key,$key,0x20
	stvx		v24,$x00,$key_		# off-load round[1]
	?vperm		v25,v31,v30,$keyperm
	lvx		v31,$x00,$key
	stvx		v25,$x10,$key_		# off-load round[2]
	addi		$key_,$key_,0x20
	bdnz		Load_ctr32_enc_key

	lvx		v26,$x10,$key
	?vperm		v24,v30,v31,$keyperm
	lvx		v27,$x20,$key
	stvx		v24,$x00,$key_		# off-load round[3]
	?vperm		v25,v31,v26,$keyperm
	lvx		v28,$x30,$key
	stvx		v25,$x10,$key_		# off-load round[4]
	addi		$key_,$sp,$FRAME+15	# rewind $key_
	?vperm		v26,v26,v27,$keyperm
	lvx		v29,$x40,$key
	?vperm		v27,v27,v28,$keyperm
	lvx		v30,$x50,$key
	?vperm		v28,v28,v29,$keyperm
	lvx		v31,$x60,$key
	?vperm		v29,v29,v30,$keyperm
	lvx		$out0,$x70,$key		# borrow $out0
	?vperm		v30,v30,v31,$keyperm
	lvx		v24,$x00,$key_		# pre-load round[1]
	?vperm		v31,v31,$out0,$keyperm
	lvx		v25,$x10,$key_		# pre-load round[2]

	vadduqm		$two,$one,$one
	subi		$inp,$inp,15		# undo "caller"
	$SHL		$len,$len,4

	vadduqm		$out1,$ivec,$one	# counter values ...
	vadduqm		$out2,$ivec,$two	# (do all ctr adds as 128-bit)
	vxor		$out0,$ivec,$rndkey0	# ... xored with rndkey[0]
	 le?li		$idx,8
	vadduqm		$out3,$out1,$two
	vxor		$out1,$out1,$rndkey0
	 le?lvsl	$inpperm,0,$idx
	vadduqm		$out4,$out2,$two
	vxor		$out2,$out2,$rndkey0
	 le?vspltisb	$tmp,0x0f
	vadduqm		$out5,$out3,$two
	vxor		$out3,$out3,$rndkey0
	 le?vxor	$inpperm,$inpperm,$tmp	# transform for lvx_u/stvx_u
	vadduqm		$out6,$out4,$two
	vxor		$out4,$out4,$rndkey0
	vadduqm		$out7,$out5,$two
	vxor		$out5,$out5,$rndkey0
	vadduqm		$ivec,$out6,$two	# next counter value
	vxor		$out6,$out6,$rndkey0
	vxor		$out7,$out7,$rndkey0

	mtctr		$rounds
	b		Loop_ctr32_enc8x
.align	5
Loop_ctr32_enc8x:
	vcipher 	$out0,$out0,v24
	vcipher 	$out1,$out1,v24
	vcipher 	$out2,$out2,v24
	vcipher 	$out3,$out3,v24
	vcipher 	$out4,$out4,v24
	vcipher 	$out5,$out5,v24
	vcipher 	$out6,$out6,v24
	vcipher 	$out7,$out7,v24
Loop_ctr32_enc8x_middle:
	lvx		v24,$x20,$key_		# round[3]
	addi		$key_,$key_,0x20

	vcipher 	$out0,$out0,v25
	vcipher 	$out1,$out1,v25
	vcipher 	$out2,$out2,v25
	vcipher 	$out3,$out3,v25
	vcipher 	$out4,$out4,v25
	vcipher 	$out5,$out5,v25
	vcipher 	$out6,$out6,v25
	vcipher 	$out7,$out7,v25
	lvx		v25,$x10,$key_		# round[4]
	bdnz		Loop_ctr32_enc8x

	subic		r11,$len,256		# $len-256, borrow $key_
	vcipher 	$out0,$out0,v24
	vcipher 	$out1,$out1,v24
	vcipher 	$out2,$out2,v24
	vcipher 	$out3,$out3,v24
	vcipher 	$out4,$out4,v24
	vcipher 	$out5,$out5,v24
	vcipher 	$out6,$out6,v24
	vcipher 	$out7,$out7,v24

	subfe		r0,r0,r0		# borrow?-1:0
	vcipher 	$out0,$out0,v25
	vcipher 	$out1,$out1,v25
	vcipher 	$out2,$out2,v25
	vcipher 	$out3,$out3,v25
	vcipher 	$out4,$out4,v25
	vcipher		$out5,$out5,v25
	vcipher		$out6,$out6,v25
	vcipher		$out7,$out7,v25

	and		r0,r0,r11
	addi		$key_,$sp,$FRAME+15	# rewind $key_
	vcipher		$out0,$out0,v26
	vcipher		$out1,$out1,v26
	vcipher		$out2,$out2,v26
	vcipher		$out3,$out3,v26
	vcipher		$out4,$out4,v26
	vcipher		$out5,$out5,v26
	vcipher		$out6,$out6,v26
	vcipher		$out7,$out7,v26
	lvx		v24,$x00,$key_		# re-pre-load round[1]

	subic		$len,$len,129		# $len-=129
	vcipher		$out0,$out0,v27
	addi		$len,$len,1		# $len-=128 really
	vcipher		$out1,$out1,v27
	vcipher		$out2,$out2,v27
	vcipher		$out3,$out3,v27
	vcipher		$out4,$out4,v27
	vcipher		$out5,$out5,v27
	vcipher		$out6,$out6,v27
	vcipher		$out7,$out7,v27
	lvx		v25,$x10,$key_		# re-pre-load round[2]

	vcipher		$out0,$out0,v28
	 lvx_u		$in0,$x00,$inp		# load input
	vcipher		$out1,$out1,v28
	 lvx_u		$in1,$x10,$inp
	vcipher		$out2,$out2,v28
	 lvx_u		$in2,$x20,$inp
	vcipher		$out3,$out3,v28
	 lvx_u		$in3,$x30,$inp
	vcipher		$out4,$out4,v28
	 lvx_u		$in4,$x40,$inp
	vcipher		$out5,$out5,v28
	 lvx_u		$in5,$x50,$inp
	vcipher		$out6,$out6,v28
	 lvx_u		$in6,$x60,$inp
	vcipher		$out7,$out7,v28
	 lvx_u		$in7,$x70,$inp
	 addi		$inp,$inp,0x80

	vcipher		$out0,$out0,v29
	 le?vperm	$in0,$in0,$in0,$inpperm
	vcipher		$out1,$out1,v29
	 le?vperm	$in1,$in1,$in1,$inpperm
	vcipher		$out2,$out2,v29
	 le?vperm	$in2,$in2,$in2,$inpperm
	vcipher		$out3,$out3,v29
	 le?vperm	$in3,$in3,$in3,$inpperm
	vcipher		$out4,$out4,v29
	 le?vperm	$in4,$in4,$in4,$inpperm
	vcipher		$out5,$out5,v29
	 le?vperm	$in5,$in5,$in5,$inpperm
	vcipher		$out6,$out6,v29
	 le?vperm	$in6,$in6,$in6,$inpperm
	vcipher		$out7,$out7,v29
	 le?vperm	$in7,$in7,$in7,$inpperm

	add		$inp,$inp,r0		# $inp is adjusted in such
						# way that at exit from the
						# loop inX-in7 are loaded
						# with last "words"
	subfe.		r0,r0,r0		# borrow?-1:0
	vcipher		$out0,$out0,v30
	 vxor		$in0,$in0,v31		# xor with last round key
	vcipher		$out1,$out1,v30
	 vxor		$in1,$in1,v31
	vcipher		$out2,$out2,v30
	 vxor		$in2,$in2,v31
	vcipher		$out3,$out3,v30
	 vxor		$in3,$in3,v31
	vcipher		$out4,$out4,v30
	 vxor		$in4,$in4,v31
	vcipher		$out5,$out5,v30
	 vxor		$in5,$in5,v31
	vcipher		$out6,$out6,v30
	 vxor		$in6,$in6,v31
	vcipher		$out7,$out7,v30
	 vxor		$in7,$in7,v31

	bne		Lctr32_enc8x_break	# did $len-129 borrow?

	vcipherlast	$in0,$out0,$in0
	vcipherlast	$in1,$out1,$in1
	 vadduqm	$out1,$ivec,$one	# counter values ...
	vcipherlast	$in2,$out2,$in2
	 vadduqm	$out2,$ivec,$two
	 vxor		$out0,$ivec,$rndkey0	# ... xored with rndkey[0]
	vcipherlast	$in3,$out3,$in3
	 vadduqm	$out3,$out1,$two
	 vxor		$out1,$out1,$rndkey0
	vcipherlast	$in4,$out4,$in4
	 vadduqm	$out4,$out2,$two
	 vxor		$out2,$out2,$rndkey0
	vcipherlast	$in5,$out5,$in5
	 vadduqm	$out5,$out3,$two
	 vxor		$out3,$out3,$rndkey0
	vcipherlast	$in6,$out6,$in6
	 vadduqm	$out6,$out4,$two
	 vxor		$out4,$out4,$rndkey0
	vcipherlast	$in7,$out7,$in7
	 vadduqm	$out7,$out5,$two
	 vxor		$out5,$out5,$rndkey0
	le?vperm	$in0,$in0,$in0,$inpperm
	 vadduqm	$ivec,$out6,$two	# next counter value
	 vxor		$out6,$out6,$rndkey0
	le?vperm	$in1,$in1,$in1,$inpperm
	 vxor		$out7,$out7,$rndkey0
	mtctr		$rounds

	 vcipher	$out0,$out0,v24
	stvx_u		$in0,$x00,$out
	le?vperm	$in2,$in2,$in2,$inpperm
	 vcipher	$out1,$out1,v24
	stvx_u		$in1,$x10,$out
	le?vperm	$in3,$in3,$in3,$inpperm
	 vcipher	$out2,$out2,v24
	stvx_u		$in2,$x20,$out
	le?vperm	$in4,$in4,$in4,$inpperm
	 vcipher	$out3,$out3,v24
	stvx_u		$in3,$x30,$out
	le?vperm	$in5,$in5,$in5,$inpperm
	 vcipher	$out4,$out4,v24
	stvx_u		$in4,$x40,$out
	le?vperm	$in6,$in6,$in6,$inpperm
	 vcipher	$out5,$out5,v24
	stvx_u		$in5,$x50,$out
	le?vperm	$in7,$in7,$in7,$inpperm
	 vcipher	$out6,$out6,v24
	stvx_u		$in6,$x60,$out
	 vcipher	$out7,$out7,v24
	stvx_u		$in7,$x70,$out
	addi		$out,$out,0x80

	b		Loop_ctr32_enc8x_middle

.align	5
Lctr32_enc8x_break:
	cmpwi		$len,-0x60
	blt		Lctr32_enc8x_one
	nop
	beq		Lctr32_enc8x_two
	cmpwi		$len,-0x40
	blt		Lctr32_enc8x_three
	nop
	beq		Lctr32_enc8x_four
	cmpwi		$len,-0x20
	blt		Lctr32_enc8x_five
	nop
	beq		Lctr32_enc8x_six
	cmpwi		$len,0x00
	blt		Lctr32_enc8x_seven

Lctr32_enc8x_eight:
	vcipherlast	$out0,$out0,$in0
	vcipherlast	$out1,$out1,$in1
	vcipherlast	$out2,$out2,$in2
	vcipherlast	$out3,$out3,$in3
	vcipherlast	$out4,$out4,$in4
	vcipherlast	$out5,$out5,$in5
	vcipherlast	$out6,$out6,$in6
	vcipherlast	$out7,$out7,$in7

	le?vperm	$out0,$out0,$out0,$inpperm
	le?vperm	$out1,$out1,$out1,$inpperm
	stvx_u		$out0,$x00,$out
	le?vperm	$out2,$out2,$out2,$inpperm
	stvx_u		$out1,$x10,$out
	le?vperm	$out3,$out3,$out3,$inpperm
	stvx_u		$out2,$x20,$out
	le?vperm	$out4,$out4,$out4,$inpperm
	stvx_u		$out3,$x30,$out
	le?vperm	$out5,$out5,$out5,$inpperm
	stvx_u		$out4,$x40,$out
	le?vperm	$out6,$out6,$out6,$inpperm
	stvx_u		$out5,$x50,$out
	le?vperm	$out7,$out7,$out7,$inpperm
	stvx_u		$out6,$x60,$out
	stvx_u		$out7,$x70,$out
	addi		$out,$out,0x80
	b		Lctr32_enc8x_done

.align	5
Lctr32_enc8x_seven:
	vcipherlast	$out0,$out0,$in1
	vcipherlast	$out1,$out1,$in2
	vcipherlast	$out2,$out2,$in3
	vcipherlast	$out3,$out3,$in4
	vcipherlast	$out4,$out4,$in5
	vcipherlast	$out5,$out5,$in6
	vcipherlast	$out6,$out6,$in7

	le?vperm	$out0,$out0,$out0,$inpperm
	le?vperm	$out1,$out1,$out1,$inpperm
	stvx_u		$out0,$x00,$out
	le?vperm	$out2,$out2,$out2,$inpperm
	stvx_u		$out1,$x10,$out
	le?vperm	$out3,$out3,$out3,$inpperm
	stvx_u		$out2,$x20,$out
	le?vperm	$out4,$out4,$out4,$inpperm
	stvx_u		$out3,$x30,$out
	le?vperm	$out5,$out5,$out5,$inpperm
	stvx_u		$out4,$x40,$out
	le?vperm	$out6,$out6,$out6,$inpperm
	stvx_u		$out5,$x50,$out
	stvx_u		$out6,$x60,$out
	addi		$out,$out,0x70
	b		Lctr32_enc8x_done

.align	5
Lctr32_enc8x_six:
	vcipherlast	$out0,$out0,$in2
	vcipherlast	$out1,$out1,$in3
	vcipherlast	$out2,$out2,$in4
	vcipherlast	$out3,$out3,$in5
	vcipherlast	$out4,$out4,$in6
	vcipherlast	$out5,$out5,$in7

	le?vperm	$out0,$out0,$out0,$inpperm
	le?vperm	$out1,$out1,$out1,$inpperm
	stvx_u		$out0,$x00,$out
	le?vperm	$out2,$out2,$out2,$inpperm
	stvx_u		$out1,$x10,$out
	le?vperm	$out3,$out3,$out3,$inpperm
	stvx_u		$out2,$x20,$out
	le?vperm	$out4,$out4,$out4,$inpperm
	stvx_u		$out3,$x30,$out
	le?vperm	$out5,$out5,$out5,$inpperm
	stvx_u		$out4,$x40,$out
	stvx_u		$out5,$x50,$out
	addi		$out,$out,0x60
	b		Lctr32_enc8x_done

.align	5
Lctr32_enc8x_five:
	vcipherlast	$out0,$out0,$in3
	vcipherlast	$out1,$out1,$in4
	vcipherlast	$out2,$out2,$in5
	vcipherlast	$out3,$out3,$in6
	vcipherlast	$out4,$out4,$in7

	le?vperm	$out0,$out0,$out0,$inpperm
	le?vperm	$out1,$out1,$out1,$inpperm
	stvx_u		$out0,$x00,$out
	le?vperm	$out2,$out2,$out2,$inpperm
	stvx_u		$out1,$x10,$out
	le?vperm	$out3,$out3,$out3,$inpperm
	stvx_u		$out2,$x20,$out
	le?vperm	$out4,$out4,$out4,$inpperm
	stvx_u		$out3,$x30,$out
	stvx_u		$out4,$x40,$out
	addi		$out,$out,0x50
	b		Lctr32_enc8x_done

.align	5
Lctr32_enc8x_four:
	vcipherlast	$out0,$out0,$in4
	vcipherlast	$out1,$out1,$in5
	vcipherlast	$out2,$out2,$in6
	vcipherlast	$out3,$out3,$in7

	le?vperm	$out0,$out0,$out0,$inpperm
	le?vperm	$out1,$out1,$out1,$inpperm
	stvx_u		$out0,$x00,$out
	le?vperm	$out2,$out2,$out2,$inpperm
	stvx_u		$out1,$x10,$out
	le?vperm	$out3,$out3,$out3,$inpperm
	stvx_u		$out2,$x20,$out
	stvx_u		$out3,$x30,$out
	addi		$out,$out,0x40
	b		Lctr32_enc8x_done

.align	5
Lctr32_enc8x_three:
	vcipherlast	$out0,$out0,$in5
	vcipherlast	$out1,$out1,$in6
	vcipherlast	$out2,$out2,$in7

	le?vperm	$out0,$out0,$out0,$inpperm
	le?vperm	$out1,$out1,$out1,$inpperm
	stvx_u		$out0,$x00,$out
	le?vperm	$out2,$out2,$out2,$inpperm
	stvx_u		$out1,$x10,$out
	stvx_u		$out2,$x20,$out
	addi		$out,$out,0x30
	b		Lctr32_enc8x_done

.align	5
Lctr32_enc8x_two:
	vcipherlast	$out0,$out0,$in6
	vcipherlast	$out1,$out1,$in7

	le?vperm	$out0,$out0,$out0,$inpperm
	le?vperm	$out1,$out1,$out1,$inpperm
	stvx_u		$out0,$x00,$out
	stvx_u		$out1,$x10,$out
	addi		$out,$out,0x20
	b		Lctr32_enc8x_done

.align	5
Lctr32_enc8x_one:
	vcipherlast	$out0,$out0,$in7

	le?vperm	$out0,$out0,$out0,$inpperm
	stvx_u		$out0,0,$out
	addi		$out,$out,0x10

Lctr32_enc8x_done:
	li		r10,`$FRAME+15`
	li		r11,`$FRAME+31`
	stvx		$inpperm,r10,$sp	# wipe copies of round keys
	addi		r10,r10,32
	stvx		$inpperm,r11,$sp
	addi		r11,r11,32
	stvx		$inpperm,r10,$sp
	addi		r10,r10,32
	stvx		$inpperm,r11,$sp
	addi		r11,r11,32
	stvx		$inpperm,r10,$sp
	addi		r10,r10,32
	stvx		$inpperm,r11,$sp
	addi		r11,r11,32
	stvx		$inpperm,r10,$sp
	addi		r10,r10,32
	stvx		$inpperm,r11,$sp
	addi		r11,r11,32

	mtspr		256,$vrsave
	lvx		v20,r10,$sp		# ABI says so
	addi		r10,r10,32
	lvx		v21,r11,$sp
	addi		r11,r11,32
	lvx		v22,r10,$sp
	addi		r10,r10,32
	lvx		v23,r11,$sp
	addi		r11,r11,32
	lvx		v24,r10,$sp
	addi		r10,r10,32
	lvx		v25,r11,$sp
	addi		r11,r11,32
	lvx		v26,r10,$sp
	addi		r10,r10,32
	lvx		v27,r11,$sp
	addi		r11,r11,32
	lvx		v28,r10,$sp
	addi		r10,r10,32
	lvx		v29,r11,$sp
	addi		r11,r11,32
	lvx		v30,r10,$sp
	lvx		v31,r11,$sp
	$POP		r26,`$FRAME+21*16+0*$SIZE_T`($sp)
	$POP		r27,`$FRAME+21*16+1*$SIZE_T`($sp)
	$POP		r28,`$FRAME+21*16+2*$SIZE_T`($sp)
	$POP		r29,`$FRAME+21*16+3*$SIZE_T`($sp)
	$POP		r30,`$FRAME+21*16+4*$SIZE_T`($sp)
	$POP		r31,`$FRAME+21*16+5*$SIZE_T`($sp)
	addi		$sp,$sp,`$FRAME+21*16+6*$SIZE_T`
	blr
	.long		0
	.byte		0,12,0x14,0,0x80,6,6,0
	.long		0
.size	.${prefix}_ctr32_encrypt_blocks,.-.${prefix}_ctr32_encrypt_blocks
___
}}	}}}

#########################################################################
{{{	# XTS procedures						#
# int aes_p8_xts_[en|de]crypt(const char *inp, char *out, size_t len,	#
#                             const AES_KEY *key1, const AES_KEY *key2,	#
#                             [const] unsigned char iv[16]);		#
# If $key2 is NULL, then a "tweak chaining" mode is engaged, in which	#
# input tweak value is assumed to be encrypted already, and last tweak	#
# value, one suitable for consecutive call on same chunk of data, is	#
# written back to original buffer. In addition, in "tweak chaining"	#
# mode only complete input blocks are processed.			#

my ($inp,$out,$len,$key1,$key2,$ivp,$rounds,$idx) =	map("r$_",(3..10));
my ($rndkey0,$rndkey1,$inout) =				map("v$_",(0..2));
my ($output,$inptail,$inpperm,$leperm,$keyperm) =	map("v$_",(3..7));
my ($tweak,$seven,$eighty7,$tmp,$tweak1) =		map("v$_",(8..12));
my $taillen = $key2;

   ($inp,$idx) = ($idx,$inp);				# reassign

$code.=<<___;
.globl	.${prefix}_xts_encrypt
	mr		$inp,r3				# reassign
	li		r3,-1
	${UCMP}i	$len,16
	bltlr-

	lis		r0,0xfff0
	mfspr		r12,256				# save vrsave
	li		r11,0
	mtspr		256,r0

	vspltisb	$seven,0x07			# 0x070707..07
	le?lvsl		$leperm,r11,r11
	le?vspltisb	$tmp,0x0f
	le?vxor		$leperm,$leperm,$seven

	li		$idx,15
	lvx		$tweak,0,$ivp			# load [unaligned] iv
	lvsl		$inpperm,0,$ivp
	lvx		$inptail,$idx,$ivp
	le?vxor		$inpperm,$inpperm,$tmp
	vperm		$tweak,$tweak,$inptail,$inpperm

	neg		r11,$inp
	lvsr		$inpperm,0,r11			# prepare for unaligned load
	lvx		$inout,0,$inp
	addi		$inp,$inp,15			# 15 is not typo
	le?vxor		$inpperm,$inpperm,$tmp

	${UCMP}i	$key2,0				# key2==NULL?
	beq		Lxts_enc_no_key2

	?lvsl		$keyperm,0,$key2		# prepare for unaligned key
	lwz		$rounds,240($key2)
	srwi		$rounds,$rounds,1
	subi		$rounds,$rounds,1
	li		$idx,16

	lvx		$rndkey0,0,$key2
	lvx		$rndkey1,$idx,$key2
	addi		$idx,$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vxor		$tweak,$tweak,$rndkey0
	lvx		$rndkey0,$idx,$key2
	addi		$idx,$idx,16
	mtctr		$rounds

Ltweak_xts_enc:
	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vcipher		$tweak,$tweak,$rndkey1
	lvx		$rndkey1,$idx,$key2
	addi		$idx,$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vcipher		$tweak,$tweak,$rndkey0
	lvx		$rndkey0,$idx,$key2
	addi		$idx,$idx,16
	bdnz		Ltweak_xts_enc

	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vcipher		$tweak,$tweak,$rndkey1
	lvx		$rndkey1,$idx,$key2
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vcipherlast	$tweak,$tweak,$rndkey0

	li		$ivp,0				# don't chain the tweak
	b		Lxts_enc

Lxts_enc_no_key2:
	li		$idx,-16
	and		$len,$len,$idx			# in "tweak chaining"
							# mode only complete
							# blocks are processed
Lxts_enc:
	lvx		$inptail,0,$inp
	addi		$inp,$inp,16

	?lvsl		$keyperm,0,$key1		# prepare for unaligned key
	lwz		$rounds,240($key1)
	srwi		$rounds,$rounds,1
	subi		$rounds,$rounds,1
	li		$idx,16

	vslb		$eighty7,$seven,$seven		# 0x808080..80
	vor		$eighty7,$eighty7,$seven	# 0x878787..87
	vspltisb	$tmp,1				# 0x010101..01
	vsldoi		$eighty7,$eighty7,$tmp,15	# 0x870101..01

	${UCMP}i	$len,96
	bge		_aesp8_xts_encrypt6x

	andi.		$taillen,$len,15
	subic		r0,$len,32
	subi		$taillen,$taillen,16
	subfe		r0,r0,r0
	and		r0,r0,$taillen
	add		$inp,$inp,r0

	lvx		$rndkey0,0,$key1
	lvx		$rndkey1,$idx,$key1
	addi		$idx,$idx,16
	vperm		$inout,$inout,$inptail,$inpperm
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vxor		$inout,$inout,$tweak
	vxor		$inout,$inout,$rndkey0
	lvx		$rndkey0,$idx,$key1
	addi		$idx,$idx,16
	mtctr		$rounds
	b		Loop_xts_enc

.align	5
Loop_xts_enc:
	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vcipher		$inout,$inout,$rndkey1
	lvx		$rndkey1,$idx,$key1
	addi		$idx,$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vcipher		$inout,$inout,$rndkey0
	lvx		$rndkey0,$idx,$key1
	addi		$idx,$idx,16
	bdnz		Loop_xts_enc

	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vcipher		$inout,$inout,$rndkey1
	lvx		$rndkey1,$idx,$key1
	li		$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vxor		$rndkey0,$rndkey0,$tweak
	vcipherlast	$output,$inout,$rndkey0

	le?vperm	$tmp,$output,$output,$leperm
	be?nop
	le?stvx_u	$tmp,0,$out
	be?stvx_u	$output,0,$out
	addi		$out,$out,16

	subic.		$len,$len,16
	beq		Lxts_enc_done

	vmr		$inout,$inptail
	lvx		$inptail,0,$inp
	addi		$inp,$inp,16
	lvx		$rndkey0,0,$key1
	lvx		$rndkey1,$idx,$key1
	addi		$idx,$idx,16

	subic		r0,$len,32
	subfe		r0,r0,r0
	and		r0,r0,$taillen
	add		$inp,$inp,r0

	vsrab		$tmp,$tweak,$seven		# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	vsldoi		$tmp,$tmp,$tmp,15
	vand		$tmp,$tmp,$eighty7
	vxor		$tweak,$tweak,$tmp

	vperm		$inout,$inout,$inptail,$inpperm
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vxor		$inout,$inout,$tweak
	vxor		$output,$output,$rndkey0	# just in case $len<16
	vxor		$inout,$inout,$rndkey0
	lvx		$rndkey0,$idx,$key1
	addi		$idx,$idx,16

	mtctr		$rounds
	${UCMP}i	$len,16
	bge		Loop_xts_enc

	vxor		$output,$output,$tweak
	lvsr		$inpperm,0,$len			# $inpperm is no longer needed
	vxor		$inptail,$inptail,$inptail	# $inptail is no longer needed
	vspltisb	$tmp,-1
	vperm		$inptail,$inptail,$tmp,$inpperm
	vsel		$inout,$inout,$output,$inptail

	subi		r11,$out,17
	subi		$out,$out,16
	mtctr		$len
	li		$len,16
Loop_xts_enc_steal:
	lbzu		r0,1(r11)
	stb		r0,16(r11)
	bdnz		Loop_xts_enc_steal

	mtctr		$rounds
	b		Loop_xts_enc			# one more time...

Lxts_enc_done:
	${UCMP}i	$ivp,0
	beq		Lxts_enc_ret

	vsrab		$tmp,$tweak,$seven		# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	vsldoi		$tmp,$tmp,$tmp,15
	vand		$tmp,$tmp,$eighty7
	vxor		$tweak,$tweak,$tmp

	le?vperm	$tweak,$tweak,$tweak,$leperm
	stvx_u		$tweak,0,$ivp

Lxts_enc_ret:
	mtspr		256,r12				# restore vrsave
	li		r3,0
	blr
	.long		0
	.byte		0,12,0x04,0,0x80,6,6,0
	.long		0
.size	.${prefix}_xts_encrypt,.-.${prefix}_xts_encrypt

.globl	.${prefix}_xts_decrypt
	mr		$inp,r3				# reassign
	li		r3,-1
	${UCMP}i	$len,16
	bltlr-

	lis		r0,0xfff8
	mfspr		r12,256				# save vrsave
	li		r11,0
	mtspr		256,r0

	andi.		r0,$len,15
	neg		r0,r0
	andi.		r0,r0,16
	sub		$len,$len,r0

	vspltisb	$seven,0x07			# 0x070707..07
	le?lvsl		$leperm,r11,r11
	le?vspltisb	$tmp,0x0f
	le?vxor		$leperm,$leperm,$seven

	li		$idx,15
	lvx		$tweak,0,$ivp			# load [unaligned] iv
	lvsl		$inpperm,0,$ivp
	lvx		$inptail,$idx,$ivp
	le?vxor		$inpperm,$inpperm,$tmp
	vperm		$tweak,$tweak,$inptail,$inpperm

	neg		r11,$inp
	lvsr		$inpperm,0,r11			# prepare for unaligned load
	lvx		$inout,0,$inp
	addi		$inp,$inp,15			# 15 is not typo
	le?vxor		$inpperm,$inpperm,$tmp

	${UCMP}i	$key2,0				# key2==NULL?
	beq		Lxts_dec_no_key2

	?lvsl		$keyperm,0,$key2		# prepare for unaligned key
	lwz		$rounds,240($key2)
	srwi		$rounds,$rounds,1
	subi		$rounds,$rounds,1
	li		$idx,16

	lvx		$rndkey0,0,$key2
	lvx		$rndkey1,$idx,$key2
	addi		$idx,$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vxor		$tweak,$tweak,$rndkey0
	lvx		$rndkey0,$idx,$key2
	addi		$idx,$idx,16
	mtctr		$rounds

Ltweak_xts_dec:
	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vcipher		$tweak,$tweak,$rndkey1
	lvx		$rndkey1,$idx,$key2
	addi		$idx,$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vcipher		$tweak,$tweak,$rndkey0
	lvx		$rndkey0,$idx,$key2
	addi		$idx,$idx,16
	bdnz		Ltweak_xts_dec

	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vcipher		$tweak,$tweak,$rndkey1
	lvx		$rndkey1,$idx,$key2
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vcipherlast	$tweak,$tweak,$rndkey0

	li		$ivp,0				# don't chain the tweak
	b		Lxts_dec

Lxts_dec_no_key2:
	neg		$idx,$len
	andi.		$idx,$idx,15
	add		$len,$len,$idx			# in "tweak chaining"
							# mode only complete
							# blocks are processed
Lxts_dec:
	lvx		$inptail,0,$inp
	addi		$inp,$inp,16

	?lvsl		$keyperm,0,$key1		# prepare for unaligned key
	lwz		$rounds,240($key1)
	srwi		$rounds,$rounds,1
	subi		$rounds,$rounds,1
	li		$idx,16

	vslb		$eighty7,$seven,$seven		# 0x808080..80
	vor		$eighty7,$eighty7,$seven	# 0x878787..87
	vspltisb	$tmp,1				# 0x010101..01
	vsldoi		$eighty7,$eighty7,$tmp,15	# 0x870101..01

	${UCMP}i	$len,96
	bge		_aesp8_xts_decrypt6x

	lvx		$rndkey0,0,$key1
	lvx		$rndkey1,$idx,$key1
	addi		$idx,$idx,16
	vperm		$inout,$inout,$inptail,$inpperm
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vxor		$inout,$inout,$tweak
	vxor		$inout,$inout,$rndkey0
	lvx		$rndkey0,$idx,$key1
	addi		$idx,$idx,16
	mtctr		$rounds

	${UCMP}i	$len,16
	blt		Ltail_xts_dec
	be?b		Loop_xts_dec

.align	5
Loop_xts_dec:
	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vncipher	$inout,$inout,$rndkey1
	lvx		$rndkey1,$idx,$key1
	addi		$idx,$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vncipher	$inout,$inout,$rndkey0
	lvx		$rndkey0,$idx,$key1
	addi		$idx,$idx,16
	bdnz		Loop_xts_dec

	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vncipher	$inout,$inout,$rndkey1
	lvx		$rndkey1,$idx,$key1
	li		$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vxor		$rndkey0,$rndkey0,$tweak
	vncipherlast	$output,$inout,$rndkey0

	le?vperm	$tmp,$output,$output,$leperm
	be?nop
	le?stvx_u	$tmp,0,$out
	be?stvx_u	$output,0,$out
	addi		$out,$out,16

	subic.		$len,$len,16
	beq		Lxts_dec_done

	vmr		$inout,$inptail
	lvx		$inptail,0,$inp
	addi		$inp,$inp,16
	lvx		$rndkey0,0,$key1
	lvx		$rndkey1,$idx,$key1
	addi		$idx,$idx,16

	vsrab		$tmp,$tweak,$seven		# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	vsldoi		$tmp,$tmp,$tmp,15
	vand		$tmp,$tmp,$eighty7
	vxor		$tweak,$tweak,$tmp

	vperm		$inout,$inout,$inptail,$inpperm
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vxor		$inout,$inout,$tweak
	vxor		$inout,$inout,$rndkey0
	lvx		$rndkey0,$idx,$key1
	addi		$idx,$idx,16

	mtctr		$rounds
	${UCMP}i	$len,16
	bge		Loop_xts_dec

Ltail_xts_dec:
	vsrab		$tmp,$tweak,$seven		# next tweak value
	vaddubm		$tweak1,$tweak,$tweak
	vsldoi		$tmp,$tmp,$tmp,15
	vand		$tmp,$tmp,$eighty7
	vxor		$tweak1,$tweak1,$tmp

	subi		$inp,$inp,16
	add		$inp,$inp,$len

	vxor		$inout,$inout,$tweak		# :-(
	vxor		$inout,$inout,$tweak1		# :-)

Loop_xts_dec_short:
	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vncipher	$inout,$inout,$rndkey1
	lvx		$rndkey1,$idx,$key1
	addi		$idx,$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vncipher	$inout,$inout,$rndkey0
	lvx		$rndkey0,$idx,$key1
	addi		$idx,$idx,16
	bdnz		Loop_xts_dec_short

	?vperm		$rndkey1,$rndkey1,$rndkey0,$keyperm
	vncipher	$inout,$inout,$rndkey1
	lvx		$rndkey1,$idx,$key1
	li		$idx,16
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm
	vxor		$rndkey0,$rndkey0,$tweak1
	vncipherlast	$output,$inout,$rndkey0

	le?vperm	$tmp,$output,$output,$leperm
	be?nop
	le?stvx_u	$tmp,0,$out
	be?stvx_u	$output,0,$out

	vmr		$inout,$inptail
	lvx		$inptail,0,$inp
	#addi		$inp,$inp,16
	lvx		$rndkey0,0,$key1
	lvx		$rndkey1,$idx,$key1
	addi		$idx,$idx,16
	vperm		$inout,$inout,$inptail,$inpperm
	?vperm		$rndkey0,$rndkey0,$rndkey1,$keyperm

	lvsr		$inpperm,0,$len			# $inpperm is no longer needed
	vxor		$inptail,$inptail,$inptail	# $inptail is no longer needed
	vspltisb	$tmp,-1
	vperm		$inptail,$inptail,$tmp,$inpperm
	vsel		$inout,$inout,$output,$inptail

	vxor		$rndkey0,$rndkey0,$tweak
	vxor		$inout,$inout,$rndkey0
	lvx		$rndkey0,$idx,$key1
	addi		$idx,$idx,16

	subi		r11,$out,1
	mtctr		$len
	li		$len,16
Loop_xts_dec_steal:
	lbzu		r0,1(r11)
	stb		r0,16(r11)
	bdnz		Loop_xts_dec_steal

	mtctr		$rounds
	b		Loop_xts_dec			# one more time...

Lxts_dec_done:
	${UCMP}i	$ivp,0
	beq		Lxts_dec_ret

	vsrab		$tmp,$tweak,$seven		# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	vsldoi		$tmp,$tmp,$tmp,15
	vand		$tmp,$tmp,$eighty7
	vxor		$tweak,$tweak,$tmp

	le?vperm	$tweak,$tweak,$tweak,$leperm
	stvx_u		$tweak,0,$ivp

Lxts_dec_ret:
	mtspr		256,r12				# restore vrsave
	li		r3,0
	blr
	.long		0
	.byte		0,12,0x04,0,0x80,6,6,0
	.long		0
.size	.${prefix}_xts_decrypt,.-.${prefix}_xts_decrypt
___
#########################################################################
{{	# Optimized XTS procedures					#
my $key_=$key2;
my ($x00,$x10,$x20,$x30,$x40,$x50,$x60,$x70)=map("r$_",(0,3,26..31));
    $x00=0 if ($flavour =~ /osx/);
my ($in0,  $in1,  $in2,  $in3,  $in4,  $in5 )=map("v$_",(0..5));
my ($out0, $out1, $out2, $out3, $out4, $out5)=map("v$_",(7,12..16));
my ($twk0, $twk1, $twk2, $twk3, $twk4, $twk5)=map("v$_",(17..22));
my $rndkey0="v23";	# v24-v25 rotating buffer for first found keys
			# v26-v31 last 6 round keys
my ($keyperm)=($out0);	# aliases with "caller", redundant assignment
my $taillen=$x70;

$code.=<<___;
.align	5
_aesp8_xts_encrypt6x:
	$STU		$sp,-`($FRAME+21*16+6*$SIZE_T)`($sp)
	mflr		r11
	li		r7,`$FRAME+8*16+15`
	li		r3,`$FRAME+8*16+31`
	$PUSH		r11,`$FRAME+21*16+6*$SIZE_T+$LRSAVE`($sp)
	stvx		v20,r7,$sp		# ABI says so
	addi		r7,r7,32
	stvx		v21,r3,$sp
	addi		r3,r3,32
	stvx		v22,r7,$sp
	addi		r7,r7,32
	stvx		v23,r3,$sp
	addi		r3,r3,32
	stvx		v24,r7,$sp
	addi		r7,r7,32
	stvx		v25,r3,$sp
	addi		r3,r3,32
	stvx		v26,r7,$sp
	addi		r7,r7,32
	stvx		v27,r3,$sp
	addi		r3,r3,32
	stvx		v28,r7,$sp
	addi		r7,r7,32
	stvx		v29,r3,$sp
	addi		r3,r3,32
	stvx		v30,r7,$sp
	stvx		v31,r3,$sp
	li		r0,-1
	stw		$vrsave,`$FRAME+21*16-4`($sp)	# save vrsave
	li		$x10,0x10
	$PUSH		r26,`$FRAME+21*16+0*$SIZE_T`($sp)
	li		$x20,0x20
	$PUSH		r27,`$FRAME+21*16+1*$SIZE_T`($sp)
	li		$x30,0x30
	$PUSH		r28,`$FRAME+21*16+2*$SIZE_T`($sp)
	li		$x40,0x40
	$PUSH		r29,`$FRAME+21*16+3*$SIZE_T`($sp)
	li		$x50,0x50
	$PUSH		r30,`$FRAME+21*16+4*$SIZE_T`($sp)
	li		$x60,0x60
	$PUSH		r31,`$FRAME+21*16+5*$SIZE_T`($sp)
	li		$x70,0x70
	mtspr		256,r0

	xxlor		2, 32+$eighty7, 32+$eighty7
	vsldoi		$eighty7,$tmp,$eighty7,1        # 0x010101..87
	xxlor		1, 32+$eighty7, 32+$eighty7

	# Load XOR Lconsts.
	mr		$x70, r6
	bl		Lconsts
	lxvw4x		0, $x40, r6		# load XOR contents
	mr		r6, $x70
	li		$x70,0x70

	subi		$rounds,$rounds,3	# -4 in total

	lvx		$rndkey0,$x00,$key1	# load key schedule
	lvx		v30,$x10,$key1
	addi		$key1,$key1,0x20
	lvx		v31,$x00,$key1
	?vperm		$rndkey0,$rndkey0,v30,$keyperm
	addi		$key_,$sp,$FRAME+15
	mtctr		$rounds

Load_xts_enc_key:
	?vperm		v24,v30,v31,$keyperm
	lvx		v30,$x10,$key1
	addi		$key1,$key1,0x20
	stvx		v24,$x00,$key_		# off-load round[1]
	?vperm		v25,v31,v30,$keyperm
	lvx		v31,$x00,$key1
	stvx		v25,$x10,$key_		# off-load round[2]
	addi		$key_,$key_,0x20
	bdnz		Load_xts_enc_key

	lvx		v26,$x10,$key1
	?vperm		v24,v30,v31,$keyperm
	lvx		v27,$x20,$key1
	stvx		v24,$x00,$key_		# off-load round[3]
	?vperm		v25,v31,v26,$keyperm
	lvx		v28,$x30,$key1
	stvx		v25,$x10,$key_		# off-load round[4]
	addi		$key_,$sp,$FRAME+15	# rewind $key_
	?vperm		v26,v26,v27,$keyperm
	lvx		v29,$x40,$key1
	?vperm		v27,v27,v28,$keyperm
	lvx		v30,$x50,$key1
	?vperm		v28,v28,v29,$keyperm
	lvx		v31,$x60,$key1
	?vperm		v29,v29,v30,$keyperm
	lvx		$twk5,$x70,$key1	# borrow $twk5
	?vperm		v30,v30,v31,$keyperm
	lvx		v24,$x00,$key_		# pre-load round[1]
	?vperm		v31,v31,$twk5,$keyperm
	lvx		v25,$x10,$key_		# pre-load round[2]

	# Switch to use the following codes with 0x010101..87 to generate tweak.
	#     eighty7 = 0x010101..87
	# vsrab         tmp, tweak, seven       # next tweak value, right shift 7 bits
	# vand          tmp, tmp, eighty7       # last byte with carry
	# vaddubm       tweak, tweak, tweak     # left shift 1 bit (x2)
	# xxlor         vsx, 0, 0
	# vpermxor      tweak, tweak, tmp, vsx

	 vperm		$in0,$inout,$inptail,$inpperm
	 subi		$inp,$inp,31		# undo "caller"
	vxor		$twk0,$tweak,$rndkey0
	vsrab		$tmp,$tweak,$seven	# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	vand		$tmp,$tmp,$eighty7
	 vxor		$out0,$in0,$twk0
	xxlor		32+$in1, 0, 0
	vpermxor	$tweak, $tweak, $tmp, $in1

	 lvx_u		$in1,$x10,$inp
	vxor		$twk1,$tweak,$rndkey0
	vsrab		$tmp,$tweak,$seven	# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	 le?vperm	$in1,$in1,$in1,$leperm
	vand		$tmp,$tmp,$eighty7
	 vxor		$out1,$in1,$twk1
	xxlor		32+$in2, 0, 0
	vpermxor	$tweak, $tweak, $tmp, $in2

	 lvx_u		$in2,$x20,$inp
	 andi.		$taillen,$len,15
	vxor		$twk2,$tweak,$rndkey0
	vsrab		$tmp,$tweak,$seven	# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	 le?vperm	$in2,$in2,$in2,$leperm
	vand		$tmp,$tmp,$eighty7
	 vxor		$out2,$in2,$twk2
	xxlor		32+$in3, 0, 0
	vpermxor	$tweak, $tweak, $tmp, $in3

	 lvx_u		$in3,$x30,$inp
	 sub		$len,$len,$taillen
	vxor		$twk3,$tweak,$rndkey0
	vsrab		$tmp,$tweak,$seven	# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	 le?vperm	$in3,$in3,$in3,$leperm
	vand		$tmp,$tmp,$eighty7
	 vxor		$out3,$in3,$twk3
	xxlor		32+$in4, 0, 0
	vpermxor	$tweak, $tweak, $tmp, $in4

	 lvx_u		$in4,$x40,$inp
	 subi		$len,$len,0x60
	vxor		$twk4,$tweak,$rndkey0
	vsrab		$tmp,$tweak,$seven	# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	 le?vperm	$in4,$in4,$in4,$leperm
	vand		$tmp,$tmp,$eighty7
	 vxor		$out4,$in4,$twk4
	xxlor		32+$in5, 0, 0
	vpermxor	$tweak, $tweak, $tmp, $in5

	 lvx_u		$in5,$x50,$inp
	 addi		$inp,$inp,0x60
	vxor		$twk5,$tweak,$rndkey0
	vsrab		$tmp,$tweak,$seven	# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	 le?vperm	$in5,$in5,$in5,$leperm
	vand		$tmp,$tmp,$eighty7
	 vxor		$out5,$in5,$twk5
	xxlor		32+$in0, 0, 0
	vpermxor	$tweak, $tweak, $tmp, $in0

	vxor		v31,v31,$rndkey0
	mtctr		$rounds
	b		Loop_xts_enc6x

.align	5
Loop_xts_enc6x:
	vcipher		$out0,$out0,v24
	vcipher		$out1,$out1,v24
	vcipher		$out2,$out2,v24
	vcipher		$out3,$out3,v24
	vcipher		$out4,$out4,v24
	vcipher		$out5,$out5,v24
	lvx		v24,$x20,$key_		# round[3]
	addi		$key_,$key_,0x20

	vcipher		$out0,$out0,v25
	vcipher		$out1,$out1,v25
	vcipher		$out2,$out2,v25
	vcipher		$out3,$out3,v25
	vcipher		$out4,$out4,v25
	vcipher		$out5,$out5,v25
	lvx		v25,$x10,$key_		# round[4]
	bdnz		Loop_xts_enc6x

	xxlor		32+$eighty7, 1, 1	# 0x010101..87

	subic		$len,$len,96		# $len-=96
	 vxor		$in0,$twk0,v31		# xor with last round key
	vcipher		$out0,$out0,v24
	vcipher		$out1,$out1,v24
	 vsrab		$tmp,$tweak,$seven	# next tweak value
	 vxor		$twk0,$tweak,$rndkey0
	 vaddubm	$tweak,$tweak,$tweak
	vcipher		$out2,$out2,v24
	vcipher		$out3,$out3,v24
	vcipher		$out4,$out4,v24
	vcipher		$out5,$out5,v24

	subfe.		r0,r0,r0		# borrow?-1:0
	 vand		$tmp,$tmp,$eighty7
	vcipher		$out0,$out0,v25
	vcipher		$out1,$out1,v25
	 xxlor		32+$in1, 0, 0
	 vpermxor	$tweak, $tweak, $tmp, $in1
	vcipher		$out2,$out2,v25
	vcipher		$out3,$out3,v25
	 vxor		$in1,$twk1,v31
	 vsrab		$tmp,$tweak,$seven	# next tweak value
	 vxor		$twk1,$tweak,$rndkey0
	vcipher		$out4,$out4,v25
	vcipher		$out5,$out5,v25

	and		r0,r0,$len
	 vaddubm	$tweak,$tweak,$tweak
	vcipher		$out0,$out0,v26
	vcipher		$out1,$out1,v26
	 vand		$tmp,$tmp,$eighty7
	vcipher		$out2,$out2,v26
	vcipher		$out3,$out3,v26
	 xxlor		32+$in2, 0, 0
	 vpermxor	$tweak, $tweak, $tmp, $in2
	vcipher		$out4,$out4,v26
	vcipher		$out5,$out5,v26

	add		$inp,$inp,r0		# $inp is adjusted in such
						# way that at exit from the
						# loop inX-in5 are loaded
						# with last "words"
	 vxor		$in2,$twk2,v31
	 vsrab		$tmp,$tweak,$seven	# next tweak value
	 vxor		$twk2,$tweak,$rndkey0
	 vaddubm	$tweak,$tweak,$tweak
	vcipher		$out0,$out0,v27
	vcipher		$out1,$out1,v27
	vcipher		$out2,$out2,v27
	vcipher		$out3,$out3,v27
	 vand		$tmp,$tmp,$eighty7
	vcipher		$out4,$out4,v27
	vcipher		$out5,$out5,v27

	addi		$key_,$sp,$FRAME+15	# rewind $key_
	 xxlor		32+$in3, 0, 0
	 vpermxor	$tweak, $tweak, $tmp, $in3
	vcipher		$out0,$out0,v28
	vcipher		$out1,$out1,v28
	 vxor		$in3,$twk3,v31
	 vsrab		$tmp,$tweak,$seven	# next tweak value
	 vxor		$twk3,$tweak,$rndkey0
	vcipher		$out2,$out2,v28
	vcipher		$out3,$out3,v28
	 vaddubm	$tweak,$tweak,$tweak
	vcipher		$out4,$out4,v28
	vcipher		$out5,$out5,v28
	lvx		v24,$x00,$key_		# re-pre-load round[1]
	 vand		$tmp,$tmp,$eighty7

	vcipher		$out0,$out0,v29
	vcipher		$out1,$out1,v29
	 xxlor		32+$in4, 0, 0
	 vpermxor	$tweak, $tweak, $tmp, $in4
	vcipher		$out2,$out2,v29
	vcipher		$out3,$out3,v29
	 vxor		$in4,$twk4,v31
	 vsrab		$tmp,$tweak,$seven	# next tweak value
	 vxor		$twk4,$tweak,$rndkey0
	vcipher		$out4,$out4,v29
	vcipher		$out5,$out5,v29
	lvx		v25,$x10,$key_		# re-pre-load round[2]
	 vaddubm	$tweak,$tweak,$tweak

	vcipher		$out0,$out0,v30
	vcipher		$out1,$out1,v30
	 vand		$tmp,$tmp,$eighty7
	vcipher		$out2,$out2,v30
	vcipher		$out3,$out3,v30
	 xxlor		32+$in5, 0, 0
	 vpermxor	$tweak, $tweak, $tmp, $in5
	vcipher		$out4,$out4,v30
	vcipher		$out5,$out5,v30
	 vxor		$in5,$twk5,v31
	 vsrab		$tmp,$tweak,$seven	# next tweak value
	 vxor		$twk5,$tweak,$rndkey0

	vcipherlast	$out0,$out0,$in0
	 lvx_u		$in0,$x00,$inp		# load next input block
	 vaddubm	$tweak,$tweak,$tweak
	vcipherlast	$out1,$out1,$in1
	 lvx_u		$in1,$x10,$inp
	vcipherlast	$out2,$out2,$in2
	 le?vperm	$in0,$in0,$in0,$leperm
	 lvx_u		$in2,$x20,$inp
	 vand		$tmp,$tmp,$eighty7
	vcipherlast	$out3,$out3,$in3
	 le?vperm	$in1,$in1,$in1,$leperm
	 lvx_u		$in3,$x30,$inp
	vcipherlast	$out4,$out4,$in4
	 le?vperm	$in2,$in2,$in2,$leperm
	 lvx_u		$in4,$x40,$inp
	 xxlor		10, 32+$in0, 32+$in0
	 xxlor		32+$in0, 0, 0
	 vpermxor	$tweak, $tweak, $tmp, $in0
	 xxlor		32+$in0, 10, 10
	vcipherlast	$tmp,$out5,$in5		# last block might be needed
						# in stealing mode
	 le?vperm	$in3,$in3,$in3,$leperm
	 lvx_u		$in5,$x50,$inp
	 addi		$inp,$inp,0x60
	 le?vperm	$in4,$in4,$in4,$leperm
	 le?vperm	$in5,$in5,$in5,$leperm

	le?vperm	$out0,$out0,$out0,$leperm
	le?vperm	$out1,$out1,$out1,$leperm
	stvx_u		$out0,$x00,$out		# store output
	 vxor		$out0,$in0,$twk0
	le?vperm	$out2,$out2,$out2,$leperm
	stvx_u		$out1,$x10,$out
	 vxor		$out1,$in1,$twk1
	le?vperm	$out3,$out3,$out3,$leperm
	stvx_u		$out2,$x20,$out
	 vxor		$out2,$in2,$twk2
	le?vperm	$out4,$out4,$out4,$leperm
	stvx_u		$out3,$x30,$out
	 vxor		$out3,$in3,$twk3
	le?vperm	$out5,$tmp,$tmp,$leperm
	stvx_u		$out4,$x40,$out
	 vxor		$out4,$in4,$twk4
	le?stvx_u	$out5,$x50,$out
	be?stvx_u	$tmp, $x50,$out
	 vxor		$out5,$in5,$twk5
	addi		$out,$out,0x60

	mtctr		$rounds
	beq		Loop_xts_enc6x		# did $len-=96 borrow?

	xxlor		32+$eighty7, 2, 2	# 0x010101..87

	addic.		$len,$len,0x60
	beq		Lxts_enc6x_zero
	cmpwi		$len,0x20
	blt		Lxts_enc6x_one
	nop
	beq		Lxts_enc6x_two
	cmpwi		$len,0x40
	blt		Lxts_enc6x_three
	nop
	beq		Lxts_enc6x_four

Lxts_enc6x_five:
	vxor		$out0,$in1,$twk0
	vxor		$out1,$in2,$twk1
	vxor		$out2,$in3,$twk2
	vxor		$out3,$in4,$twk3
	vxor		$out4,$in5,$twk4

	bl		_aesp8_xts_enc5x

	le?vperm	$out0,$out0,$out0,$leperm
	vmr		$twk0,$twk5		# unused tweak
	le?vperm	$out1,$out1,$out1,$leperm
	stvx_u		$out0,$x00,$out		# store output
	le?vperm	$out2,$out2,$out2,$leperm
	stvx_u		$out1,$x10,$out
	le?vperm	$out3,$out3,$out3,$leperm
	stvx_u		$out2,$x20,$out
	vxor		$tmp,$out4,$twk5	# last block prep for stealing
	le?vperm	$out4,$out4,$out4,$leperm
	stvx_u		$out3,$x30,$out
	stvx_u		$out4,$x40,$out
	addi		$out,$out,0x50
	bne		Lxts_enc6x_steal
	b		Lxts_enc6x_done

.align	4
Lxts_enc6x_four:
	vxor		$out0,$in2,$twk0
	vxor		$out1,$in3,$twk1
	vxor		$out2,$in4,$twk2
	vxor		$out3,$in5,$twk3
	vxor		$out4,$out4,$out4

	bl		_aesp8_xts_enc5x

	le?vperm	$out0,$out0,$out0,$leperm
	vmr		$twk0,$twk4		# unused tweak
	le?vperm	$out1,$out1,$out1,$leperm
	stvx_u		$out0,$x00,$out		# store output
	le?vperm	$out2,$out2,$out2,$leperm
	stvx_u		$out1,$x10,$out
	vxor		$tmp,$out3,$twk4	# last block prep for stealing
	le?vperm	$out3,$out3,$out3,$leperm
	stvx_u		$out2,$x20,$out
	stvx_u		$out3,$x30,$out
	addi		$out,$out,0x40
	bne		Lxts_enc6x_steal
	b		Lxts_enc6x_done

.align	4
Lxts_enc6x_three:
	vxor		$out0,$in3,$twk0
	vxor		$out1,$in4,$twk1
	vxor		$out2,$in5,$twk2
	vxor		$out3,$out3,$out3
	vxor		$out4,$out4,$out4

	bl		_aesp8_xts_enc5x

	le?vperm	$out0,$out0,$out0,$leperm
	vmr		$twk0,$twk3		# unused tweak
	le?vperm	$out1,$out1,$out1,$leperm
	stvx_u		$out0,$x00,$out		# store output
	vxor		$tmp,$out2,$twk3	# last block prep for stealing
	le?vperm	$out2,$out2,$out2,$leperm
	stvx_u		$out1,$x10,$out
	stvx_u		$out2,$x20,$out
	addi		$out,$out,0x30
	bne		Lxts_enc6x_steal
	b		Lxts_enc6x_done

.align	4
Lxts_enc6x_two:
	vxor		$out0,$in4,$twk0
	vxor		$out1,$in5,$twk1
	vxor		$out2,$out2,$out2
	vxor		$out3,$out3,$out3
	vxor		$out4,$out4,$out4

	bl		_aesp8_xts_enc5x

	le?vperm	$out0,$out0,$out0,$leperm
	vmr		$twk0,$twk2		# unused tweak
	vxor		$tmp,$out1,$twk2	# last block prep for stealing
	le?vperm	$out1,$out1,$out1,$leperm
	stvx_u		$out0,$x00,$out		# store output
	stvx_u		$out1,$x10,$out
	addi		$out,$out,0x20
	bne		Lxts_enc6x_steal
	b		Lxts_enc6x_done

.align	4
Lxts_enc6x_one:
	vxor		$out0,$in5,$twk0
	nop
Loop_xts_enc1x:
	vcipher		$out0,$out0,v24
	lvx		v24,$x20,$key_		# round[3]
	addi		$key_,$key_,0x20

	vcipher		$out0,$out0,v25
	lvx		v25,$x10,$key_		# round[4]
	bdnz		Loop_xts_enc1x

	add		$inp,$inp,$taillen
	cmpwi		$taillen,0
	vcipher		$out0,$out0,v24

	subi		$inp,$inp,16
	vcipher		$out0,$out0,v25

	lvsr		$inpperm,0,$taillen
	vcipher		$out0,$out0,v26

	lvx_u		$in0,0,$inp
	vcipher		$out0,$out0,v27

	addi		$key_,$sp,$FRAME+15	# rewind $key_
	vcipher		$out0,$out0,v28
	lvx		v24,$x00,$key_		# re-pre-load round[1]

	vcipher		$out0,$out0,v29
	lvx		v25,$x10,$key_		# re-pre-load round[2]
	 vxor		$twk0,$twk0,v31

	le?vperm	$in0,$in0,$in0,$leperm
	vcipher		$out0,$out0,v30

	vperm		$in0,$in0,$in0,$inpperm
	vcipherlast	$out0,$out0,$twk0

	vmr		$twk0,$twk1		# unused tweak
	vxor		$tmp,$out0,$twk1	# last block prep for stealing
	le?vperm	$out0,$out0,$out0,$leperm
	stvx_u		$out0,$x00,$out		# store output
	addi		$out,$out,0x10
	bne		Lxts_enc6x_steal
	b		Lxts_enc6x_done

.align	4
Lxts_enc6x_zero:
	cmpwi		$taillen,0
	beq		Lxts_enc6x_done

	add		$inp,$inp,$taillen
	subi		$inp,$inp,16
	lvx_u		$in0,0,$inp
	lvsr		$inpperm,0,$taillen	# $in5 is no more
	le?vperm	$in0,$in0,$in0,$leperm
	vperm		$in0,$in0,$in0,$inpperm
	vxor		$tmp,$tmp,$twk0
Lxts_enc6x_steal:
	vxor		$in0,$in0,$twk0
	vxor		$out0,$out0,$out0
	vspltisb	$out1,-1
	vperm		$out0,$out0,$out1,$inpperm
	vsel		$out0,$in0,$tmp,$out0	# $tmp is last block, remember?

	subi		r30,$out,17
	subi		$out,$out,16
	mtctr		$taillen
Loop_xts_enc6x_steal:
	lbzu		r0,1(r30)
	stb		r0,16(r30)
	bdnz		Loop_xts_enc6x_steal

	li		$taillen,0
	mtctr		$rounds
	b		Loop_xts_enc1x		# one more time...

.align	4
Lxts_enc6x_done:
	${UCMP}i	$ivp,0
	beq		Lxts_enc6x_ret

	vxor		$tweak,$twk0,$rndkey0
	le?vperm	$tweak,$tweak,$tweak,$leperm
	stvx_u		$tweak,0,$ivp

Lxts_enc6x_ret:
	mtlr		r11
	li		r10,`$FRAME+15`
	li		r11,`$FRAME+31`
	stvx		$seven,r10,$sp		# wipe copies of round keys
	addi		r10,r10,32
	stvx		$seven,r11,$sp
	addi		r11,r11,32
	stvx		$seven,r10,$sp
	addi		r10,r10,32
	stvx		$seven,r11,$sp
	addi		r11,r11,32
	stvx		$seven,r10,$sp
	addi		r10,r10,32
	stvx		$seven,r11,$sp
	addi		r11,r11,32
	stvx		$seven,r10,$sp
	addi		r10,r10,32
	stvx		$seven,r11,$sp
	addi		r11,r11,32

	mtspr		256,$vrsave
	lvx		v20,r10,$sp		# ABI says so
	addi		r10,r10,32
	lvx		v21,r11,$sp
	addi		r11,r11,32
	lvx		v22,r10,$sp
	addi		r10,r10,32
	lvx		v23,r11,$sp
	addi		r11,r11,32
	lvx		v24,r10,$sp
	addi		r10,r10,32
	lvx		v25,r11,$sp
	addi		r11,r11,32
	lvx		v26,r10,$sp
	addi		r10,r10,32
	lvx		v27,r11,$sp
	addi		r11,r11,32
	lvx		v28,r10,$sp
	addi		r10,r10,32
	lvx		v29,r11,$sp
	addi		r11,r11,32
	lvx		v30,r10,$sp
	lvx		v31,r11,$sp
	$POP		r26,`$FRAME+21*16+0*$SIZE_T`($sp)
	$POP		r27,`$FRAME+21*16+1*$SIZE_T`($sp)
	$POP		r28,`$FRAME+21*16+2*$SIZE_T`($sp)
	$POP		r29,`$FRAME+21*16+3*$SIZE_T`($sp)
	$POP		r30,`$FRAME+21*16+4*$SIZE_T`($sp)
	$POP		r31,`$FRAME+21*16+5*$SIZE_T`($sp)
	addi		$sp,$sp,`$FRAME+21*16+6*$SIZE_T`
	blr
	.long		0
	.byte		0,12,0x04,1,0x80,6,6,0
	.long		0

.align	5
_aesp8_xts_enc5x:
	vcipher		$out0,$out0,v24
	vcipher		$out1,$out1,v24
	vcipher		$out2,$out2,v24
	vcipher		$out3,$out3,v24
	vcipher		$out4,$out4,v24
	lvx		v24,$x20,$key_		# round[3]
	addi		$key_,$key_,0x20

	vcipher		$out0,$out0,v25
	vcipher		$out1,$out1,v25
	vcipher		$out2,$out2,v25
	vcipher		$out3,$out3,v25
	vcipher		$out4,$out4,v25
	lvx		v25,$x10,$key_		# round[4]
	bdnz		_aesp8_xts_enc5x

	add		$inp,$inp,$taillen
	cmpwi		$taillen,0
	vcipher		$out0,$out0,v24
	vcipher		$out1,$out1,v24
	vcipher		$out2,$out2,v24
	vcipher		$out3,$out3,v24
	vcipher		$out4,$out4,v24

	subi		$inp,$inp,16
	vcipher		$out0,$out0,v25
	vcipher		$out1,$out1,v25
	vcipher		$out2,$out2,v25
	vcipher		$out3,$out3,v25
	vcipher		$out4,$out4,v25
	 vxor		$twk0,$twk0,v31

	vcipher		$out0,$out0,v26
	lvsr		$inpperm,r0,$taillen	# $in5 is no more
	vcipher		$out1,$out1,v26
	vcipher		$out2,$out2,v26
	vcipher		$out3,$out3,v26
	vcipher		$out4,$out4,v26
	 vxor		$in1,$twk1,v31

	vcipher		$out0,$out0,v27
	lvx_u		$in0,0,$inp
	vcipher		$out1,$out1,v27
	vcipher		$out2,$out2,v27
	vcipher		$out3,$out3,v27
	vcipher		$out4,$out4,v27
	 vxor		$in2,$twk2,v31

	addi		$key_,$sp,$FRAME+15	# rewind $key_
	vcipher		$out0,$out0,v28
	vcipher		$out1,$out1,v28
	vcipher		$out2,$out2,v28
	vcipher		$out3,$out3,v28
	vcipher		$out4,$out4,v28
	lvx		v24,$x00,$key_		# re-pre-load round[1]
	 vxor		$in3,$twk3,v31

	vcipher		$out0,$out0,v29
	le?vperm	$in0,$in0,$in0,$leperm
	vcipher		$out1,$out1,v29
	vcipher		$out2,$out2,v29
	vcipher		$out3,$out3,v29
	vcipher		$out4,$out4,v29
	lvx		v25,$x10,$key_		# re-pre-load round[2]
	 vxor		$in4,$twk4,v31

	vcipher		$out0,$out0,v30
	vperm		$in0,$in0,$in0,$inpperm
	vcipher		$out1,$out1,v30
	vcipher		$out2,$out2,v30
	vcipher		$out3,$out3,v30
	vcipher		$out4,$out4,v30

	vcipherlast	$out0,$out0,$twk0
	vcipherlast	$out1,$out1,$in1
	vcipherlast	$out2,$out2,$in2
	vcipherlast	$out3,$out3,$in3
	vcipherlast	$out4,$out4,$in4
	blr
        .long   	0
        .byte   	0,12,0x14,0,0,0,0,0

.align	5
_aesp8_xts_decrypt6x:
	$STU		$sp,-`($FRAME+21*16+6*$SIZE_T)`($sp)
	mflr		r11
	li		r7,`$FRAME+8*16+15`
	li		r3,`$FRAME+8*16+31`
	$PUSH		r11,`$FRAME+21*16+6*$SIZE_T+$LRSAVE`($sp)
	stvx		v20,r7,$sp		# ABI says so
	addi		r7,r7,32
	stvx		v21,r3,$sp
	addi		r3,r3,32
	stvx		v22,r7,$sp
	addi		r7,r7,32
	stvx		v23,r3,$sp
	addi		r3,r3,32
	stvx		v24,r7,$sp
	addi		r7,r7,32
	stvx		v25,r3,$sp
	addi		r3,r3,32
	stvx		v26,r7,$sp
	addi		r7,r7,32
	stvx		v27,r3,$sp
	addi		r3,r3,32
	stvx		v28,r7,$sp
	addi		r7,r7,32
	stvx		v29,r3,$sp
	addi		r3,r3,32
	stvx		v30,r7,$sp
	stvx		v31,r3,$sp
	li		r0,-1
	stw		$vrsave,`$FRAME+21*16-4`($sp)	# save vrsave
	li		$x10,0x10
	$PUSH		r26,`$FRAME+21*16+0*$SIZE_T`($sp)
	li		$x20,0x20
	$PUSH		r27,`$FRAME+21*16+1*$SIZE_T`($sp)
	li		$x30,0x30
	$PUSH		r28,`$FRAME+21*16+2*$SIZE_T`($sp)
	li		$x40,0x40
	$PUSH		r29,`$FRAME+21*16+3*$SIZE_T`($sp)
	li		$x50,0x50
	$PUSH		r30,`$FRAME+21*16+4*$SIZE_T`($sp)
	li		$x60,0x60
	$PUSH		r31,`$FRAME+21*16+5*$SIZE_T`($sp)
	li		$x70,0x70
	mtspr		256,r0

	xxlor		2, 32+$eighty7, 32+$eighty7
	vsldoi		$eighty7,$tmp,$eighty7,1        # 0x010101..87
	xxlor		1, 32+$eighty7, 32+$eighty7

	# Load XOR Lconsts.
	mr		$x70, r6
	bl		Lconsts
	lxvw4x		0, $x40, r6		# load XOR contents
	mr		r6, $x70
	li		$x70,0x70

	subi		$rounds,$rounds,3	# -4 in total

	lvx		$rndkey0,$x00,$key1	# load key schedule
	lvx		v30,$x10,$key1
	addi		$key1,$key1,0x20
	lvx		v31,$x00,$key1
	?vperm		$rndkey0,$rndkey0,v30,$keyperm
	addi		$key_,$sp,$FRAME+15
	mtctr		$rounds

Load_xts_dec_key:
	?vperm		v24,v30,v31,$keyperm
	lvx		v30,$x10,$key1
	addi		$key1,$key1,0x20
	stvx		v24,$x00,$key_		# off-load round[1]
	?vperm		v25,v31,v30,$keyperm
	lvx		v31,$x00,$key1
	stvx		v25,$x10,$key_		# off-load round[2]
	addi		$key_,$key_,0x20
	bdnz		Load_xts_dec_key

	lvx		v26,$x10,$key1
	?vperm		v24,v30,v31,$keyperm
	lvx		v27,$x20,$key1
	stvx		v24,$x00,$key_		# off-load round[3]
	?vperm		v25,v31,v26,$keyperm
	lvx		v28,$x30,$key1
	stvx		v25,$x10,$key_		# off-load round[4]
	addi		$key_,$sp,$FRAME+15	# rewind $key_
	?vperm		v26,v26,v27,$keyperm
	lvx		v29,$x40,$key1
	?vperm		v27,v27,v28,$keyperm
	lvx		v30,$x50,$key1
	?vperm		v28,v28,v29,$keyperm
	lvx		v31,$x60,$key1
	?vperm		v29,v29,v30,$keyperm
	lvx		$twk5,$x70,$key1	# borrow $twk5
	?vperm		v30,v30,v31,$keyperm
	lvx		v24,$x00,$key_		# pre-load round[1]
	?vperm		v31,v31,$twk5,$keyperm
	lvx		v25,$x10,$key_		# pre-load round[2]

	 vperm		$in0,$inout,$inptail,$inpperm
	 subi		$inp,$inp,31		# undo "caller"
	vxor		$twk0,$tweak,$rndkey0
	vsrab		$tmp,$tweak,$seven	# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	vand		$tmp,$tmp,$eighty7
	 vxor		$out0,$in0,$twk0
	xxlor		32+$in1, 0, 0
	vpermxor	$tweak, $tweak, $tmp, $in1

	 lvx_u		$in1,$x10,$inp
	vxor		$twk1,$tweak,$rndkey0
	vsrab		$tmp,$tweak,$seven	# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	 le?vperm	$in1,$in1,$in1,$leperm
	vand		$tmp,$tmp,$eighty7
	 vxor		$out1,$in1,$twk1
	xxlor		32+$in2, 0, 0
	vpermxor	$tweak, $tweak, $tmp, $in2

	 lvx_u		$in2,$x20,$inp
	 andi.		$taillen,$len,15
	vxor		$twk2,$tweak,$rndkey0
	vsrab		$tmp,$tweak,$seven	# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	 le?vperm	$in2,$in2,$in2,$leperm
	vand		$tmp,$tmp,$eighty7
	 vxor		$out2,$in2,$twk2
	xxlor		32+$in3, 0, 0
	vpermxor	$tweak, $tweak, $tmp, $in3

	 lvx_u		$in3,$x30,$inp
	 sub		$len,$len,$taillen
	vxor		$twk3,$tweak,$rndkey0
	vsrab		$tmp,$tweak,$seven	# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	 le?vperm	$in3,$in3,$in3,$leperm
	vand		$tmp,$tmp,$eighty7
	 vxor		$out3,$in3,$twk3
	xxlor		32+$in4, 0, 0
	vpermxor	$tweak, $tweak, $tmp, $in4

	 lvx_u		$in4,$x40,$inp
	 subi		$len,$len,0x60
	vxor		$twk4,$tweak,$rndkey0
	vsrab		$tmp,$tweak,$seven	# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	 le?vperm	$in4,$in4,$in4,$leperm
	vand		$tmp,$tmp,$eighty7
	 vxor		$out4,$in4,$twk4
	xxlor		32+$in5, 0, 0
	vpermxor	$tweak, $tweak, $tmp, $in5

	 lvx_u		$in5,$x50,$inp
	 addi		$inp,$inp,0x60
	vxor		$twk5,$tweak,$rndkey0
	vsrab		$tmp,$tweak,$seven	# next tweak value
	vaddubm		$tweak,$tweak,$tweak
	 le?vperm	$in5,$in5,$in5,$leperm
	vand		$tmp,$tmp,$eighty7
	 vxor		$out5,$in5,$twk5
	xxlor		32+$in0, 0, 0
	vpermxor	$tweak, $tweak, $tmp, $in0

	vxor		v31,v31,$rndkey0
	mtctr		$rounds
	b		Loop_xts_dec6x

.align	5
Loop_xts_dec6x:
	vncipher	$out0,$out0,v24
	vncipher	$out1,$out1,v24
	vncipher	$out2,$out2,v24
	vncipher	$out3,$out3,v24
	vncipher	$out4,$out4,v24
	vncipher	$out5,$out5,v24
	lvx		v24,$x20,$key_		# round[3]
	addi		$key_,$key_,0x20

	vncipher	$out0,$out0,v25
	vncipher	$out1,$out1,v25
	vncipher	$out2,$out2,v25
	vncipher	$out3,$out3,v25
	vncipher	$out4,$out4,v25
	vncipher	$out5,$out5,v25
	lvx		v25,$x10,$key_		# round[4]
	bdnz		Loop_xts_dec6x

	xxlor		32+$eighty7, 1, 1	# 0x010101..87

	subic		$len,$len,96		# $len-=96
	 vxor		$in0,$twk0,v31		# xor with last round key
	vncipher	$out0,$out0,v24
	vncipher	$out1,$out1,v24
	 vsrab		$tmp,$tweak,$seven	# next tweak value
	 vxor		$twk0,$tweak,$rndkey0
	 vaddubm	$tweak,$tweak,$tweak
	vncipher	$out2,$out2,v24
	vncipher	$out3,$out3,v24
	vncipher	$out4,$out4,v24
	vncipher	$out5,$out5,v24

	subfe.		r0,r0,r0		# borrow?-1:0
	 vand		$tmp,$tmp,$eighty7
	vncipher	$out0,$out0,v25
	vncipher	$out1,$out1,v25
	 xxlor		32+$in1, 0, 0
	 vpermxor	$tweak, $tweak, $tmp, $in1
	vncipher	$out2,$out2,v25
	vncipher	$out3,$out3,v25
	 vxor		$in1,$twk1,v31
	 vsrab		$tmp,$tweak,$seven	# next tweak value
	 vxor		$twk1,$tweak,$rndkey0
	vncipher	$out4,$out4,v25
	vncipher	$out5,$out5,v25

	and		r0,r0,$len
	 vaddubm	$tweak,$tweak,$tweak
	vncipher	$out0,$out0,v26
	vncipher	$out1,$out1,v26
	 vand		$tmp,$tmp,$eighty7
	vncipher	$out2,$out2,v26
	vncipher	$out3,$out3,v26
	 xxlor		32+$in2, 0, 0
	 vpermxor	$tweak, $tweak, $tmp, $in2
	vncipher	$out4,$out4,v26
	vncipher	$out5,$out5,v26

	add		$inp,$inp,r0		# $inp is adjusted in such
						# way that at exit from the
						# loop inX-in5 are loaded
						# with last "words"
	 vxor		$in2,$twk2,v31
	 vsrab		$tmp,$tweak,$seven	# next tweak value
	 vxor		$twk2,$tweak,$rndkey0
	 vaddubm	$tweak,$tweak,$tweak
	vncipher	$out0,$out0,v27
	vncipher	$out1,$out1,v27
	vncipher	$out2,$out2,v27
	vncipher	$out3,$out3,v27
	 vand		$tmp,$tmp,$eighty7
	vncipher	$out4,$out4,v27
	vncipher	$out5,$out5,v27

	addi		$key_,$sp,$FRAME+15	# rewind $key_
	 xxlor		32+$in3, 0, 0
	 vpermxor	$tweak, $tweak, $tmp, $in3
	vncipher	$out0,$out0,v28
	vncipher	$out1,$out1,v28
	 vxor		$in3,$twk3,v31
	 vsrab		$tmp,$tweak,$seven	# next tweak value
	 vxor		$twk3,$tweak,$rndkey0
	vncipher	$out2,$out2,v28
	vncipher	$out3,$out3,v28
	 vaddubm	$tweak,$tweak,$tweak
	vncipher	$out4,$out4,v28
	vncipher	$out5,$out5,v28
	lvx		v24,$x00,$key_		# re-pre-load round[1]
	 vand		$tmp,$tmp,$eighty7

	vncipher	$out0,$out0,v29
	vncipher	$out1,$out1,v29
	 xxlor		32+$in4, 0, 0
	 vpermxor	$tweak, $tweak, $tmp, $in4
	vncipher	$out2,$out2,v29
	vncipher	$out3,$out3,v29
	 vxor		$in4,$twk4,v31
	 vsrab		$tmp,$tweak,$seven	# next tweak value
	 vxor		$twk4,$tweak,$rndkey0
	vncipher	$out4,$out4,v29
	vncipher	$out5,$out5,v29
	lvx		v25,$x10,$key_		# re-pre-load round[2]
	 vaddubm	$tweak,$tweak,$tweak

	vncipher	$out0,$out0,v30
	vncipher	$out1,$out1,v30
	 vand		$tmp,$tmp,$eighty7
	vncipher	$out2,$out2,v30
	vncipher	$out3,$out3,v30
	 xxlor		32+$in5, 0, 0
	 vpermxor	$tweak, $tweak, $tmp, $in5
	vncipher	$out4,$out4,v30
	vncipher	$out5,$out5,v30
	 vxor		$in5,$twk5,v31
	 vsrab		$tmp,$tweak,$seven	# next tweak value
	 vxor		$twk5,$tweak,$rndkey0

	vncipherlast	$out0,$out0,$in0
	 lvx_u		$in0,$x00,$inp		# load next input block
	 vaddubm	$tweak,$tweak,$tweak
	vncipherlast	$out1,$out1,$in1
	 lvx_u		$in1,$x10,$inp
	vncipherlast	$out2,$out2,$in2
	 le?vperm	$in0,$in0,$in0,$leperm
	 lvx_u		$in2,$x20,$inp
	 vand		$tmp,$tmp,$eighty7
	vncipherlast	$out3,$out3,$in3
	 le?vperm	$in1,$in1,$in1,$leperm
	 lvx_u		$in3,$x30,$inp
	vncipherlast	$out4,$out4,$in4
	 le?vperm	$in2,$in2,$in2,$leperm
	 lvx_u		$in4,$x40,$inp
	 xxlor		10, 32+$in0, 32+$in0
	 xxlor		32+$in0, 0, 0
	 vpermxor	$tweak, $tweak, $tmp, $in0
	 xxlor		32+$in0, 10, 10
	vncipherlast	$out5,$out5,$in5
	 le?vperm	$in3,$in3,$in3,$leperm
	 lvx_u		$in5,$x50,$inp
	 addi		$inp,$inp,0x60
	 le?vperm	$in4,$in4,$in4,$leperm
	 le?vperm	$in5,$in5,$in5,$leperm

	le?vperm	$out0,$out0,$out0,$leperm
	le?vperm	$out1,$out1,$out1,$leperm
	stvx_u		$out0,$x00,$out		# store output
	 vxor		$out0,$in0,$twk0
	le?vperm	$out2,$out2,$out2,$leperm
	stvx_u		$out1,$x10,$out
	 vxor		$out1,$in1,$twk1
	le?vperm	$out3,$out3,$out3,$leperm
	stvx_u		$out2,$x20,$out
	 vxor		$out2,$in2,$twk2
	le?vperm	$out4,$out4,$out4,$leperm
	stvx_u		$out3,$x30,$out
	 vxor		$out3,$in3,$twk3
	le?vperm	$out5,$out5,$out5,$leperm
	stvx_u		$out4,$x40,$out
	 vxor		$out4,$in4,$twk4
	stvx_u		$out5,$x50,$out
	 vxor		$out5,$in5,$twk5
	addi		$out,$out,0x60

	mtctr		$rounds
	beq		Loop_xts_dec6x		# did $len-=96 borrow?

	xxlor		32+$eighty7, 2, 2	# 0x010101..87

	addic.		$len,$len,0x60
	beq		Lxts_dec6x_zero
	cmpwi		$len,0x20
	blt		Lxts_dec6x_one
	nop
	beq		Lxts_dec6x_two
	cmpwi		$len,0x40
	blt		Lxts_dec6x_three
	nop
	beq		Lxts_dec6x_four

Lxts_dec6x_five:
	vxor		$out0,$in1,$twk0
	vxor		$out1,$in2,$twk1
	vxor		$out2,$in3,$twk2
	vxor		$out3,$in4,$twk3
	vxor		$out4,$in5,$twk4

	bl		_aesp8_xts_dec5x

	le?vperm	$out0,$out0,$out0,$leperm
	vmr		$twk0,$twk5		# unused tweak
	vxor		$twk1,$tweak,$rndkey0
	le?vperm	$out1,$out1,$out1,$leperm
	stvx_u		$out0,$x00,$out		# store output
	vxor		$out0,$in0,$twk1
	le?vperm	$out2,$out2,$out2,$leperm
	stvx_u		$out1,$x10,$out
	le?vperm	$out3,$out3,$out3,$leperm
	stvx_u		$out2,$x20,$out
	le?vperm	$out4,$out4,$out4,$leperm
	stvx_u		$out3,$x30,$out
	stvx_u		$out4,$x40,$out
	addi		$out,$out,0x50
	bne		Lxts_dec6x_steal
	b		Lxts_dec6x_done

.align	4
Lxts_dec6x_four:
	vxor		$out0,$in2,$twk0
	vxor		$out1,$in3,$twk1
	vxor		$out2,$in4,$twk2
	vxor		$out3,$in5,$twk3
	vxor		$out4,$out4,$out4

	bl		_aesp8_xts_dec5x

	le?vperm	$out0,$out0,$out0,$leperm
	vmr		$twk0,$twk4		# unused tweak
	vmr		$twk1,$twk5
	le?vperm	$out1,$out1,$out1,$leperm
	stvx_u		$out0,$x00,$out		# store output
	vxor		$out0,$in0,$twk5
	le?vperm	$out2,$out2,$out2,$leperm
	stvx_u		$out1,$x10,$out
	le?vperm	$out3,$out3,$out3,$leperm
	stvx_u		$out2,$x20,$out
	stvx_u		$out3,$x30,$out
	addi		$out,$out,0x40
	bne		Lxts_dec6x_steal
	b		Lxts_dec6x_done

.align	4
Lxts_dec6x_three:
	vxor		$out0,$in3,$twk0
	vxor		$out1,$in4,$twk1
	vxor		$out2,$in5,$twk2
	vxor		$out3,$out3,$out3
	vxor		$out4,$out4,$out4

	bl		_aesp8_xts_dec5x

	le?vperm	$out0,$out0,$out0,$leperm
	vmr		$twk0,$twk3		# unused tweak
	vmr		$twk1,$twk4
	le?vperm	$out1,$out1,$out1,$leperm
	stvx_u		$out0,$x00,$out		# store output
	vxor		$out0,$in0,$twk4
	le?vperm	$out2,$out2,$out2,$leperm
	stvx_u		$out1,$x10,$out
	stvx_u		$out2,$x20,$out
	addi		$out,$out,0x30
	bne		Lxts_dec6x_steal
	b		Lxts_dec6x_done

.align	4
Lxts_dec6x_two:
	vxor		$out0,$in4,$twk0
	vxor		$out1,$in5,$twk1
	vxor		$out2,$out2,$out2
	vxor		$out3,$out3,$out3
	vxor		$out4,$out4,$out4

	bl		_aesp8_xts_dec5x

	le?vperm	$out0,$out0,$out0,$leperm
	vmr		$twk0,$twk2		# unused tweak
	vmr		$twk1,$twk3
	le?vperm	$out1,$out1,$out1,$leperm
	stvx_u		$out0,$x00,$out		# store output
	vxor		$out0,$in0,$twk3
	stvx_u		$out1,$x10,$out
	addi		$out,$out,0x20
	bne		Lxts_dec6x_steal
	b		Lxts_dec6x_done

.align	4
Lxts_dec6x_one:
	vxor		$out0,$in5,$twk0
	nop
Loop_xts_dec1x:
	vncipher	$out0,$out0,v24
	lvx		v24,$x20,$key_		# round[3]
	addi		$key_,$key_,0x20

	vncipher	$out0,$out0,v25
	lvx		v25,$x10,$key_		# round[4]
	bdnz		Loop_xts_dec1x

	subi		r0,$taillen,1
	vncipher	$out0,$out0,v24

	andi.		r0,r0,16
	cmpwi		$taillen,0
	vncipher	$out0,$out0,v25

	sub		$inp,$inp,r0
	vncipher	$out0,$out0,v26

	lvx_u		$in0,0,$inp
	vncipher	$out0,$out0,v27

	addi		$key_,$sp,$FRAME+15	# rewind $key_
	vncipher	$out0,$out0,v28
	lvx		v24,$x00,$key_		# re-pre-load round[1]

	vncipher	$out0,$out0,v29
	lvx		v25,$x10,$key_		# re-pre-load round[2]
	 vxor		$twk0,$twk0,v31

	le?vperm	$in0,$in0,$in0,$leperm
	vncipher	$out0,$out0,v30

	mtctr		$rounds
	vncipherlast	$out0,$out0,$twk0

	vmr		$twk0,$twk1		# unused tweak
	vmr		$twk1,$twk2
	le?vperm	$out0,$out0,$out0,$leperm
	stvx_u		$out0,$x00,$out		# store output
	addi		$out,$out,0x10
	vxor		$out0,$in0,$twk2
	bne		Lxts_dec6x_steal
	b		Lxts_dec6x_done

.align	4
Lxts_dec6x_zero:
	cmpwi		$taillen,0
	beq		Lxts_dec6x_done

	lvx_u		$in0,0,$inp
	le?vperm	$in0,$in0,$in0,$leperm
	vxor		$out0,$in0,$twk1
Lxts_dec6x_steal:
	vncipher	$out0,$out0,v24
	lvx		v24,$x20,$key_		# round[3]
	addi		$key_,$key_,0x20

	vncipher	$out0,$out0,v25
	lvx		v25,$x10,$key_		# round[4]
	bdnz		Lxts_dec6x_steal

	add		$inp,$inp,$taillen
	vncipher	$out0,$out0,v24

	cmpwi		$taillen,0
	vncipher	$out0,$out0,v25

	lvx_u		$in0,0,$inp
	vncipher	$out0,$out0,v26

	lvsr		$inpperm,0,$taillen	# $in5 is no more
	vncipher	$out0,$out0,v27

	addi		$key_,$sp,$FRAME+15	# rewind $key_
	vncipher	$out0,$out0,v28
	lvx		v24,$x00,$key_		# re-pre-load round[1]

	vncipher	$out0,$out0,v29
	lvx		v25,$x10,$key_		# re-pre-load round[2]
	 vxor		$twk1,$twk1,v31

	le?vperm	$in0,$in0,$in0,$leperm
	vncipher	$out0,$out0,v30

	vperm		$in0,$in0,$in0,$inpperm
	vncipherlast	$tmp,$out0,$twk1

	le?vperm	$out0,$tmp,$tmp,$leperm
	le?stvx_u	$out0,0,$out
	be?stvx_u	$tmp,0,$out

	vxor		$out0,$out0,$out0
	vspltisb	$out1,-1
	vperm		$out0,$out0,$out1,$inpperm
	vsel		$out0,$in0,$tmp,$out0
	vxor		$out0,$out0,$twk0

	subi		r30,$out,1
	mtctr		$taillen
Loop_xts_dec6x_steal:
	lbzu		r0,1(r30)
	stb		r0,16(r30)
	bdnz		Loop_xts_dec6x_steal

	li		$taillen,0
	mtctr		$rounds
	b		Loop_xts_dec1x		# one more time...

.align	4
Lxts_dec6x_done:
	${UCMP}i	$ivp,0
	beq		Lxts_dec6x_ret

	vxor		$tweak,$twk0,$rndkey0
	le?vperm	$tweak,$tweak,$tweak,$leperm
	stvx_u		$tweak,0,$ivp

Lxts_dec6x_ret:
	mtlr		r11
	li		r10,`$FRAME+15`
	li		r11,`$FRAME+31`
	stvx		$seven,r10,$sp		# wipe copies of round keys
	addi		r10,r10,32
	stvx		$seven,r11,$sp
	addi		r11,r11,32
	stvx		$seven,r10,$sp
	addi		r10,r10,32
	stvx		$seven,r11,$sp
	addi		r11,r11,32
	stvx		$seven,r10,$sp
	addi		r10,r10,32
	stvx		$seven,r11,$sp
	addi		r11,r11,32
	stvx		$seven,r10,$sp
	addi		r10,r10,32
	stvx		$seven,r11,$sp
	addi		r11,r11,32

	mtspr		256,$vrsave
	lvx		v20,r10,$sp		# ABI says so
	addi		r10,r10,32
	lvx		v21,r11,$sp
	addi		r11,r11,32
	lvx		v22,r10,$sp
	addi		r10,r10,32
	lvx		v23,r11,$sp
	addi		r11,r11,32
	lvx		v24,r10,$sp
	addi		r10,r10,32
	lvx		v25,r11,$sp
	addi		r11,r11,32
	lvx		v26,r10,$sp
	addi		r10,r10,32
	lvx		v27,r11,$sp
	addi		r11,r11,32
	lvx		v28,r10,$sp
	addi		r10,r10,32
	lvx		v29,r11,$sp
	addi		r11,r11,32
	lvx		v30,r10,$sp
	lvx		v31,r11,$sp
	$POP		r26,`$FRAME+21*16+0*$SIZE_T`($sp)
	$POP		r27,`$FRAME+21*16+1*$SIZE_T`($sp)
	$POP		r28,`$FRAME+21*16+2*$SIZE_T`($sp)
	$POP		r29,`$FRAME+21*16+3*$SIZE_T`($sp)
	$POP		r30,`$FRAME+21*16+4*$SIZE_T`($sp)
	$POP		r31,`$FRAME+21*16+5*$SIZE_T`($sp)
	addi		$sp,$sp,`$FRAME+21*16+6*$SIZE_T`
	blr
	.long		0
	.byte		0,12,0x04,1,0x80,6,6,0
	.long		0

.align	5
_aesp8_xts_dec5x:
	vncipher	$out0,$out0,v24
	vncipher	$out1,$out1,v24
	vncipher	$out2,$out2,v24
	vncipher	$out3,$out3,v24
	vncipher	$out4,$out4,v24
	lvx		v24,$x20,$key_		# round[3]
	addi		$key_,$key_,0x20

	vncipher	$out0,$out0,v25
	vncipher	$out1,$out1,v25
	vncipher	$out2,$out2,v25
	vncipher	$out3,$out3,v25
	vncipher	$out4,$out4,v25
	lvx		v25,$x10,$key_		# round[4]
	bdnz		_aesp8_xts_dec5x

	subi		r0,$taillen,1
	vncipher	$out0,$out0,v24
	vncipher	$out1,$out1,v24
	vncipher	$out2,$out2,v24
	vncipher	$out3,$out3,v24
	vncipher	$out4,$out4,v24

	andi.		r0,r0,16
	cmpwi		$taillen,0
	vncipher	$out0,$out0,v25
	vncipher	$out1,$out1,v25
	vncipher	$out2,$out2,v25
	vncipher	$out3,$out3,v25
	vncipher	$out4,$out4,v25
	 vxor		$twk0,$twk0,v31

	sub		$inp,$inp,r0
	vncipher	$out0,$out0,v26
	vncipher	$out1,$out1,v26
	vncipher	$out2,$out2,v26
	vncipher	$out3,$out3,v26
	vncipher	$out4,$out4,v26
	 vxor		$in1,$twk1,v31

	vncipher	$out0,$out0,v27
	lvx_u		$in0,0,$inp
	vncipher	$out1,$out1,v27
	vncipher	$out2,$out2,v27
	vncipher	$out3,$out3,v27
	vncipher	$out4,$out4,v27
	 vxor		$in2,$twk2,v31

	addi		$key_,$sp,$FRAME+15	# rewind $key_
	vncipher	$out0,$out0,v28
	vncipher	$out1,$out1,v28
	vncipher	$out2,$out2,v28
	vncipher	$out3,$out3,v28
	vncipher	$out4,$out4,v28
	lvx		v24,$x00,$key_		# re-pre-load round[1]
	 vxor		$in3,$twk3,v31

	vncipher	$out0,$out0,v29
	le?vperm	$in0,$in0,$in0,$leperm
	vncipher	$out1,$out1,v29
	vncipher	$out2,$out2,v29
	vncipher	$out3,$out3,v29
	vncipher	$out4,$out4,v29
	lvx		v25,$x10,$key_		# re-pre-load round[2]
	 vxor		$in4,$twk4,v31

	vncipher	$out0,$out0,v30
	vncipher	$out1,$out1,v30
	vncipher	$out2,$out2,v30
	vncipher	$out3,$out3,v30
	vncipher	$out4,$out4,v30

	vncipherlast	$out0,$out0,$twk0
	vncipherlast	$out1,$out1,$in1
	vncipherlast	$out2,$out2,$in2
	vncipherlast	$out3,$out3,$in3
	vncipherlast	$out4,$out4,$in4
	mtctr		$rounds
	blr
        .long   	0
        .byte   	0,12,0x14,0,0,0,0,0
___
}}	}}}

my $consts=1;
foreach(split("\n",$code)) {
        s/\`([^\`]*)\`/eval($1)/geo;

	# constants table endian-specific conversion
	if ($consts && m/\.(long|byte)\s+(.+)\s+(\?[a-z]*)$/o) {
	    my $conv=$3;
	    my @bytes=();

	    # convert to endian-agnostic format
	    if ($1 eq "long") {
	      foreach (split(/,\s*/,$2)) {
		my $l = /^0/?oct:int;
		push @bytes,($l>>24)&0xff,($l>>16)&0xff,($l>>8)&0xff,$l&0xff;
	      }
	    } else {
		@bytes = map(/^0/?oct:int,split(/,\s*/,$2));
	    }

	    # little-endian conversion
	    if ($flavour =~ /le$/o) {
		SWITCH: for($conv)  {
		    /\?inv/ && do   { @bytes=map($_^0xf,@bytes); last; };
		    /\?rev/ && do   { @bytes=reverse(@bytes);    last; };
		}
	    }

	    #emit
	    print ".byte\t",join(',',map (sprintf("0x%02x",$_),@bytes)),"\n";
	    next;
	}
	$consts=0 if (m/Lconsts:/o);	# end of table

	# instructions prefixed with '?' are endian-specific and need
	# to be adjusted accordingly...
	if ($flavour =~ /le$/o) {	# little-endian
	    s/le\?//o		or
	    s/be\?/#be#/o	or
	    s/\?lvsr/lvsl/o	or
	    s/\?lvsl/lvsr/o	or
	    s/\?(vperm\s+v[0-9]+,\s*)(v[0-9]+,\s*)(v[0-9]+,\s*)(v[0-9]+)/$1$3$2$4/o or
	    s/\?(vsldoi\s+v[0-9]+,\s*)(v[0-9]+,)\s*(v[0-9]+,\s*)([0-9]+)/$1$3$2 16-$4/o or
	    s/\?(vspltw\s+v[0-9]+,\s*)(v[0-9]+,)\s*([0-9])/$1$2 3-$3/o;
	} else {			# big-endian
	    s/le\?/#le#/o	or
	    s/be\?//o		or
	    s/\?([a-z]+)/$1/o;
	}

        print $_,"\n";
}

close STDOUT;