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Message-Id: <20221205003458.4182-5-dtsen@linux.ibm.com>
Date: Sun, 4 Dec 2022 19:34:56 -0500
From: Danny Tsen <dtsen@...ux.ibm.com>
To: linux-crypto@...r.kernel.org
Cc: herbert@...dor.apana.org.au, leitao@...ian.org,
nayna@...ux.ibm.com, appro@...ptogams.org,
linux-kernel@...r.kernel.org, ltcgcw@...ux.vnet.ibm.com,
dtsen@...ux.ibm.com
Subject: [PATCH v2 4/6] Supporting functions for AES.
This code is taken from CRYPTOGAMs[1]. The following functions are used,
aes_p8_set_encrypt_key is used to generate AES round keys and aes_p8_encrypt is used
to encrypt single block.
Signed-off-by: Danny Tsen <dtsen@...ux.ibm.com>
---
arch/powerpc/crypto/aesp8-ppc.pl | 3846 ++++++++++++++++++++++++++++++
1 file changed, 3846 insertions(+)
create mode 100644 arch/powerpc/crypto/aesp8-ppc.pl
diff --git a/arch/powerpc/crypto/aesp8-ppc.pl b/arch/powerpc/crypto/aesp8-ppc.pl
new file mode 100644
index 000000000000..50a0a18f35da
--- /dev/null
+++ b/arch/powerpc/crypto/aesp8-ppc.pl
@@ -0,0 +1,3846 @@
+#! /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@...nssl.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@...nssl.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
+Lconsts:
+ mflr r0
+ bcl 20,31,\$+4
+ mflr $ptr #vvvvv "distance between . and rcon
+ addi $ptr,$ptr,-0x48
+ 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
+
+ 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]
+
+ 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
+ vsldoi $tmp,$tmp,$tmp,15
+ vand $tmp,$tmp,$eighty7
+ vxor $out0,$in0,$twk0
+ vxor $tweak,$tweak,$tmp
+
+ lvx_u $in1,$x10,$inp
+ vxor $twk1,$tweak,$rndkey0
+ vsrab $tmp,$tweak,$seven # next tweak value
+ vaddubm $tweak,$tweak,$tweak
+ vsldoi $tmp,$tmp,$tmp,15
+ le?vperm $in1,$in1,$in1,$leperm
+ vand $tmp,$tmp,$eighty7
+ vxor $out1,$in1,$twk1
+ vxor $tweak,$tweak,$tmp
+
+ lvx_u $in2,$x20,$inp
+ andi. $taillen,$len,15
+ vxor $twk2,$tweak,$rndkey0
+ vsrab $tmp,$tweak,$seven # next tweak value
+ vaddubm $tweak,$tweak,$tweak
+ vsldoi $tmp,$tmp,$tmp,15
+ le?vperm $in2,$in2,$in2,$leperm
+ vand $tmp,$tmp,$eighty7
+ vxor $out2,$in2,$twk2
+ vxor $tweak,$tweak,$tmp
+
+ lvx_u $in3,$x30,$inp
+ sub $len,$len,$taillen
+ vxor $twk3,$tweak,$rndkey0
+ vsrab $tmp,$tweak,$seven # next tweak value
+ vaddubm $tweak,$tweak,$tweak
+ vsldoi $tmp,$tmp,$tmp,15
+ le?vperm $in3,$in3,$in3,$leperm
+ vand $tmp,$tmp,$eighty7
+ vxor $out3,$in3,$twk3
+ vxor $tweak,$tweak,$tmp
+
+ lvx_u $in4,$x40,$inp
+ subi $len,$len,0x60
+ vxor $twk4,$tweak,$rndkey0
+ vsrab $tmp,$tweak,$seven # next tweak value
+ vaddubm $tweak,$tweak,$tweak
+ vsldoi $tmp,$tmp,$tmp,15
+ le?vperm $in4,$in4,$in4,$leperm
+ vand $tmp,$tmp,$eighty7
+ vxor $out4,$in4,$twk4
+ vxor $tweak,$tweak,$tmp
+
+ lvx_u $in5,$x50,$inp
+ addi $inp,$inp,0x60
+ vxor $twk5,$tweak,$rndkey0
+ vsrab $tmp,$tweak,$seven # next tweak value
+ vaddubm $tweak,$tweak,$tweak
+ vsldoi $tmp,$tmp,$tmp,15
+ le?vperm $in5,$in5,$in5,$leperm
+ vand $tmp,$tmp,$eighty7
+ vxor $out5,$in5,$twk5
+ vxor $tweak,$tweak,$tmp
+
+ vxor v31,v31,$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
+
+ 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
+ vsldoi $tmp,$tmp,$tmp,15
+ 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
+ vxor $tweak,$tweak,$tmp
+ 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
+ vsldoi $tmp,$tmp,$tmp,15
+ vcipher $out0,$out0,v26
+ vcipher $out1,$out1,v26
+ vand $tmp,$tmp,$eighty7
+ vcipher $out2,$out2,v26
+ vcipher $out3,$out3,v26
+ vxor $tweak,$tweak,$tmp
+ 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
+ vsldoi $tmp,$tmp,$tmp,15
+ 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_
+ vxor $tweak,$tweak,$tmp
+ 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
+ vsldoi $tmp,$tmp,$tmp,15
+ 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
+ vxor $tweak,$tweak,$tmp
+ 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
+ vsldoi $tmp,$tmp,$tmp,15
+
+ vcipher $out0,$out0,v30
+ vcipher $out1,$out1,v30
+ vand $tmp,$tmp,$eighty7
+ vcipher $out2,$out2,v30
+ vcipher $out3,$out3,v30
+ vxor $tweak,$tweak,$tmp
+ 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
+ vsldoi $tmp,$tmp,$tmp,15
+ 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
+ vxor $tweak,$tweak,$tmp
+ 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?
+
+ 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
+
+ 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
+ vsldoi $tmp,$tmp,$tmp,15
+ vand $tmp,$tmp,$eighty7
+ vxor $out0,$in0,$twk0
+ vxor $tweak,$tweak,$tmp
+
+ lvx_u $in1,$x10,$inp
+ vxor $twk1,$tweak,$rndkey0
+ vsrab $tmp,$tweak,$seven # next tweak value
+ vaddubm $tweak,$tweak,$tweak
+ vsldoi $tmp,$tmp,$tmp,15
+ le?vperm $in1,$in1,$in1,$leperm
+ vand $tmp,$tmp,$eighty7
+ vxor $out1,$in1,$twk1
+ vxor $tweak,$tweak,$tmp
+
+ lvx_u $in2,$x20,$inp
+ andi. $taillen,$len,15
+ vxor $twk2,$tweak,$rndkey0
+ vsrab $tmp,$tweak,$seven # next tweak value
+ vaddubm $tweak,$tweak,$tweak
+ vsldoi $tmp,$tmp,$tmp,15
+ le?vperm $in2,$in2,$in2,$leperm
+ vand $tmp,$tmp,$eighty7
+ vxor $out2,$in2,$twk2
+ vxor $tweak,$tweak,$tmp
+
+ lvx_u $in3,$x30,$inp
+ sub $len,$len,$taillen
+ vxor $twk3,$tweak,$rndkey0
+ vsrab $tmp,$tweak,$seven # next tweak value
+ vaddubm $tweak,$tweak,$tweak
+ vsldoi $tmp,$tmp,$tmp,15
+ le?vperm $in3,$in3,$in3,$leperm
+ vand $tmp,$tmp,$eighty7
+ vxor $out3,$in3,$twk3
+ vxor $tweak,$tweak,$tmp
+
+ lvx_u $in4,$x40,$inp
+ subi $len,$len,0x60
+ vxor $twk4,$tweak,$rndkey0
+ vsrab $tmp,$tweak,$seven # next tweak value
+ vaddubm $tweak,$tweak,$tweak
+ vsldoi $tmp,$tmp,$tmp,15
+ le?vperm $in4,$in4,$in4,$leperm
+ vand $tmp,$tmp,$eighty7
+ vxor $out4,$in4,$twk4
+ vxor $tweak,$tweak,$tmp
+
+ lvx_u $in5,$x50,$inp
+ addi $inp,$inp,0x60
+ vxor $twk5,$tweak,$rndkey0
+ vsrab $tmp,$tweak,$seven # next tweak value
+ vaddubm $tweak,$tweak,$tweak
+ vsldoi $tmp,$tmp,$tmp,15
+ le?vperm $in5,$in5,$in5,$leperm
+ vand $tmp,$tmp,$eighty7
+ vxor $out5,$in5,$twk5
+ vxor $tweak,$tweak,$tmp
+
+ vxor v31,v31,$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
+
+ 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
+ vsldoi $tmp,$tmp,$tmp,15
+ 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
+ vxor $tweak,$tweak,$tmp
+ 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
+ vsldoi $tmp,$tmp,$tmp,15
+ vncipher $out0,$out0,v26
+ vncipher $out1,$out1,v26
+ vand $tmp,$tmp,$eighty7
+ vncipher $out2,$out2,v26
+ vncipher $out3,$out3,v26
+ vxor $tweak,$tweak,$tmp
+ 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
+ vsldoi $tmp,$tmp,$tmp,15
+ 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_
+ vxor $tweak,$tweak,$tmp
+ 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
+ vsldoi $tmp,$tmp,$tmp,15
+ 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
+ vxor $tweak,$tweak,$tmp
+ 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
+ vsldoi $tmp,$tmp,$tmp,15
+
+ vncipher $out0,$out0,v30
+ vncipher $out1,$out1,v30
+ vand $tmp,$tmp,$eighty7
+ vncipher $out2,$out2,v30
+ vncipher $out3,$out3,v30
+ vxor $tweak,$tweak,$tmp
+ 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
+ vsldoi $tmp,$tmp,$tmp,15
+ 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
+ vxor $tweak,$tweak,$tmp
+ 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?
+
+ 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;
--
2.31.1
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