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boringssl/crypto/fipsmodule/aes/asm/bsaes-armv7.pl
David Benjamin 672f6fc248 Always use adr with __thumb2__. 
Thumb2 addresses are a bit a mess, depending on whether a label is
interpreted as a function pointer value (for use with BX and BLX) or as
a program counter value (for use with PC-relative addressing). Clang's
integrated assembler mis-assembles this code. See
https://crbug.com/124610#c54 for details.

Instead, use the ADR pseudo-instruction which has clear semantics and
should be supported by every assembler that handles the OpenSSL Thumb2
code. (In other files, the ADR vs SUB conditionals are based on
__thumb2__ already. For some reason, this one is based on __APPLE__, I'm
guessing to deal with an older version of clang assembler.)

It's unclear to me which of clang or binutils is "correct" or if this is
even a well-defined notion beyond "whatever binutils does". But I will
note that https://github.com/openssl/openssl/pull/4669 suggests binutils
has also changed behavior around this before.

See also https://github.com/openssl/openssl/pull/5431 in OpenSSL.

Bug: chromium:124610
Change-Id: I5e7a0c8c0f54a3f65cc324ad599a41883675f368
Reviewed-on: https://boringssl-review.googlesource.com/26164
Commit-Queue: Steven Valdez <svaldez@google.com>
Reviewed-by: Steven Valdez <svaldez@google.com>
CQ-Verified: CQ bot account: commit-bot@chromium.org <commit-bot@chromium.org>
2018-02-22 22:28:15 +00:00

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#! /usr/bin/env perl
# Copyright 2012-2016 The OpenSSL Project Authors. All Rights Reserved.
#
# Licensed under the OpenSSL license (the "License"). You may not use
# this file except in compliance with the License. You can obtain a copy
# in the file LICENSE in the source distribution or at
# https://www.openssl.org/source/license.html
# ====================================================================
# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
# project. The module is, however, dual licensed under OpenSSL and
# CRYPTOGAMS licenses depending on where you obtain it. For further
# details see http://www.openssl.org/~appro/cryptogams/.
#
# Specific modes and adaptation for Linux kernel by Ard Biesheuvel
# of Linaro. Permission to use under GPL terms is granted.
# ====================================================================
# Bit-sliced AES for ARM NEON
#
# February 2012.
#
# This implementation is direct adaptation of bsaes-x86_64 module for
# ARM NEON. Except that this module is endian-neutral [in sense that
# it can be compiled for either endianness] by courtesy of vld1.8's
# neutrality. Initial version doesn't implement interface to OpenSSL,
# only low-level primitives and unsupported entry points, just enough
# to collect performance results, which for Cortex-A8 core are:
#
# encrypt 19.5 cycles per byte processed with 128-bit key
# decrypt 22.1 cycles per byte processed with 128-bit key
# key conv. 440 cycles per 128-bit key/0.18 of 8x block
#
# Snapdragon S4 encrypts byte in 17.6 cycles and decrypts in 19.7,
# which is [much] worse than anticipated (for further details see
# http://www.openssl.org/~appro/Snapdragon-S4.html).
#
# Cortex-A15 manages in 14.2/16.1 cycles [when integer-only code
# manages in 20.0 cycles].
#
# When comparing to x86_64 results keep in mind that NEON unit is
# [mostly] single-issue and thus can't [fully] benefit from
# instruction-level parallelism. And when comparing to aes-armv4
# results keep in mind key schedule conversion overhead (see
# bsaes-x86_64.pl for further details)...
#
# <appro@openssl.org>
# April-August 2013
# Add CBC, CTR and XTS subroutines and adapt for kernel use; courtesy of Ard.
$flavour = shift;
if ($flavour=~/\w[\w\-]*\.\w+$/) { $output=$flavour; undef $flavour; }
else { while (($output=shift) && ($output!~/\w[\w\-]*\.\w+$/)) {} }
if ($flavour && $flavour ne "void") {
$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
( $xlate="${dir}arm-xlate.pl" and -f $xlate ) or
( $xlate="${dir}../../../perlasm/arm-xlate.pl" and -f $xlate) or
die "can't locate arm-xlate.pl";
open STDOUT,"| \"$^X\" $xlate $flavour $output";
} else {
open STDOUT,">$output";
}
my ($inp,$out,$len,$key)=("r0","r1","r2","r3");
my @XMM=map("q$_",(0..15));
{
my ($key,$rounds,$const)=("r4","r5","r6");
sub Dlo() { shift=~m|q([1]?[0-9])|?"d".($1*2):""; }
sub Dhi() { shift=~m|q([1]?[0-9])|?"d".($1*2+1):""; }
sub Sbox {
# input in lsb > [b0, b1, b2, b3, b4, b5, b6, b7] < msb
# output in lsb > [b0, b1, b4, b6, b3, b7, b2, b5] < msb
my @b=@_[0..7];
my @t=@_[8..11];
my @s=@_[12..15];
&InBasisChange (@b);
&Inv_GF256 (@b[6,5,0,3,7,1,4,2],@t,@s);
&OutBasisChange (@b[7,1,4,2,6,5,0,3]);
}
sub InBasisChange {
# input in lsb > [b0, b1, b2, b3, b4, b5, b6, b7] < msb
# output in lsb > [b6, b5, b0, b3, b7, b1, b4, b2] < msb
my @b=@_[0..7];
$code.=<<___;
veor @b[2], @b[2], @b[1]
veor @b[5], @b[5], @b[6]
veor @b[3], @b[3], @b[0]
veor @b[6], @b[6], @b[2]
veor @b[5], @b[5], @b[0]
veor @b[6], @b[6], @b[3]
veor @b[3], @b[3], @b[7]
veor @b[7], @b[7], @b[5]
veor @b[3], @b[3], @b[4]
veor @b[4], @b[4], @b[5]
veor @b[2], @b[2], @b[7]
veor @b[3], @b[3], @b[1]
veor @b[1], @b[1], @b[5]
___
}
sub OutBasisChange {
# input in lsb > [b0, b1, b2, b3, b4, b5, b6, b7] < msb
# output in lsb > [b6, b1, b2, b4, b7, b0, b3, b5] < msb
my @b=@_[0..7];
$code.=<<___;
veor @b[0], @b[0], @b[6]
veor @b[1], @b[1], @b[4]
veor @b[4], @b[4], @b[6]
veor @b[2], @b[2], @b[0]
veor @b[6], @b[6], @b[1]
veor @b[1], @b[1], @b[5]
veor @b[5], @b[5], @b[3]
veor @b[3], @b[3], @b[7]
veor @b[7], @b[7], @b[5]
veor @b[2], @b[2], @b[5]
veor @b[4], @b[4], @b[7]
___
}
sub InvSbox {
# input in lsb > [b0, b1, b2, b3, b4, b5, b6, b7] < msb
# output in lsb > [b0, b1, b6, b4, b2, b7, b3, b5] < msb
my @b=@_[0..7];
my @t=@_[8..11];
my @s=@_[12..15];
&InvInBasisChange (@b);
&Inv_GF256 (@b[5,1,2,6,3,7,0,4],@t,@s);
&InvOutBasisChange (@b[3,7,0,4,5,1,2,6]);
}
sub InvInBasisChange { # OutBasisChange in reverse (with twist)
my @b=@_[5,1,2,6,3,7,0,4];
$code.=<<___
veor @b[1], @b[1], @b[7]
veor @b[4], @b[4], @b[7]
veor @b[7], @b[7], @b[5]
veor @b[1], @b[1], @b[3]
veor @b[2], @b[2], @b[5]
veor @b[3], @b[3], @b[7]
veor @b[6], @b[6], @b[1]
veor @b[2], @b[2], @b[0]
veor @b[5], @b[5], @b[3]
veor @b[4], @b[4], @b[6]
veor @b[0], @b[0], @b[6]
veor @b[1], @b[1], @b[4]
___
}
sub InvOutBasisChange { # InBasisChange in reverse
my @b=@_[2,5,7,3,6,1,0,4];
$code.=<<___;
veor @b[1], @b[1], @b[5]
veor @b[2], @b[2], @b[7]
veor @b[3], @b[3], @b[1]
veor @b[4], @b[4], @b[5]
veor @b[7], @b[7], @b[5]
veor @b[3], @b[3], @b[4]
veor @b[5], @b[5], @b[0]
veor @b[3], @b[3], @b[7]
veor @b[6], @b[6], @b[2]
veor @b[2], @b[2], @b[1]
veor @b[6], @b[6], @b[3]
veor @b[3], @b[3], @b[0]
veor @b[5], @b[5], @b[6]
___
}
sub Mul_GF4 {
#;*************************************************************
#;* Mul_GF4: Input x0-x1,y0-y1 Output x0-x1 Temp t0 (8) *
#;*************************************************************
my ($x0,$x1,$y0,$y1,$t0,$t1)=@_;
$code.=<<___;
veor $t0, $y0, $y1
vand $t0, $t0, $x0
veor $x0, $x0, $x1
vand $t1, $x1, $y0
vand $x0, $x0, $y1
veor $x1, $t1, $t0
veor $x0, $x0, $t1
___
}
sub Mul_GF4_N { # not used, see next subroutine
# multiply and scale by N
my ($x0,$x1,$y0,$y1,$t0)=@_;
$code.=<<___;
veor $t0, $y0, $y1
vand $t0, $t0, $x0
veor $x0, $x0, $x1
vand $x1, $x1, $y0
vand $x0, $x0, $y1
veor $x1, $x1, $x0
veor $x0, $x0, $t0
___
}
sub Mul_GF4_N_GF4 {
# interleaved Mul_GF4_N and Mul_GF4
my ($x0,$x1,$y0,$y1,$t0,
$x2,$x3,$y2,$y3,$t1)=@_;
$code.=<<___;
veor $t0, $y0, $y1
veor $t1, $y2, $y3
vand $t0, $t0, $x0
vand $t1, $t1, $x2
veor $x0, $x0, $x1
veor $x2, $x2, $x3
vand $x1, $x1, $y0
vand $x3, $x3, $y2
vand $x0, $x0, $y1
vand $x2, $x2, $y3
veor $x1, $x1, $x0
veor $x2, $x2, $x3
veor $x0, $x0, $t0
veor $x3, $x3, $t1
___
}
sub Mul_GF16_2 {
my @x=@_[0..7];
my @y=@_[8..11];
my @t=@_[12..15];
$code.=<<___;
veor @t[0], @x[0], @x[2]
veor @t[1], @x[1], @x[3]
___
&Mul_GF4 (@x[0], @x[1], @y[0], @y[1], @t[2..3]);
$code.=<<___;
veor @y[0], @y[0], @y[2]
veor @y[1], @y[1], @y[3]
___
Mul_GF4_N_GF4 (@t[0], @t[1], @y[0], @y[1], @t[3],
@x[2], @x[3], @y[2], @y[3], @t[2]);
$code.=<<___;
veor @x[0], @x[0], @t[0]
veor @x[2], @x[2], @t[0]
veor @x[1], @x[1], @t[1]
veor @x[3], @x[3], @t[1]
veor @t[0], @x[4], @x[6]
veor @t[1], @x[5], @x[7]
___
&Mul_GF4_N_GF4 (@t[0], @t[1], @y[0], @y[1], @t[3],
@x[6], @x[7], @y[2], @y[3], @t[2]);
$code.=<<___;
veor @y[0], @y[0], @y[2]
veor @y[1], @y[1], @y[3]
___
&Mul_GF4 (@x[4], @x[5], @y[0], @y[1], @t[2..3]);
$code.=<<___;
veor @x[4], @x[4], @t[0]
veor @x[6], @x[6], @t[0]
veor @x[5], @x[5], @t[1]
veor @x[7], @x[7], @t[1]
___
}
sub Inv_GF256 {
#;********************************************************************
#;* Inv_GF256: Input x0-x7 Output x0-x7 Temp t0-t3,s0-s3 (144) *
#;********************************************************************
my @x=@_[0..7];
my @t=@_[8..11];
my @s=@_[12..15];
# direct optimizations from hardware
$code.=<<___;
veor @t[3], @x[4], @x[6]
veor @t[2], @x[5], @x[7]
veor @t[1], @x[1], @x[3]
veor @s[1], @x[7], @x[6]
vmov @t[0], @t[2]
veor @s[0], @x[0], @x[2]
vorr @t[2], @t[2], @t[1]
veor @s[3], @t[3], @t[0]
vand @s[2], @t[3], @s[0]
vorr @t[3], @t[3], @s[0]
veor @s[0], @s[0], @t[1]
vand @t[0], @t[0], @t[1]
veor @t[1], @x[3], @x[2]
vand @s[3], @s[3], @s[0]
vand @s[1], @s[1], @t[1]
veor @t[1], @x[4], @x[5]
veor @s[0], @x[1], @x[0]
veor @t[3], @t[3], @s[1]
veor @t[2], @t[2], @s[1]
vand @s[1], @t[1], @s[0]
vorr @t[1], @t[1], @s[0]
veor @t[3], @t[3], @s[3]
veor @t[0], @t[0], @s[1]
veor @t[2], @t[2], @s[2]
veor @t[1], @t[1], @s[3]
veor @t[0], @t[0], @s[2]
vand @s[0], @x[7], @x[3]
veor @t[1], @t[1], @s[2]
vand @s[1], @x[6], @x[2]
vand @s[2], @x[5], @x[1]
vorr @s[3], @x[4], @x[0]
veor @t[3], @t[3], @s[0]
veor @t[1], @t[1], @s[2]
veor @t[0], @t[0], @s[3]
veor @t[2], @t[2], @s[1]
@ Inv_GF16 \t0, \t1, \t2, \t3, \s0, \s1, \s2, \s3
@ new smaller inversion
vand @s[2], @t[3], @t[1]
vmov @s[0], @t[0]
veor @s[1], @t[2], @s[2]
veor @s[3], @t[0], @s[2]
veor @s[2], @t[0], @s[2] @ @s[2]=@s[3]
vbsl @s[1], @t[1], @t[0]
vbsl @s[3], @t[3], @t[2]
veor @t[3], @t[3], @t[2]
vbsl @s[0], @s[1], @s[2]
vbsl @t[0], @s[2], @s[1]
vand @s[2], @s[0], @s[3]
veor @t[1], @t[1], @t[0]
veor @s[2], @s[2], @t[3]
___
# output in s3, s2, s1, t1
# Mul_GF16_2 \x0, \x1, \x2, \x3, \x4, \x5, \x6, \x7, \t2, \t3, \t0, \t1, \s0, \s1, \s2, \s3
# Mul_GF16_2 \x0, \x1, \x2, \x3, \x4, \x5, \x6, \x7, \s3, \s2, \s1, \t1, \s0, \t0, \t2, \t3
&Mul_GF16_2(@x,@s[3,2,1],@t[1],@s[0],@t[0,2,3]);
### output msb > [x3,x2,x1,x0,x7,x6,x5,x4] < lsb
}
# AES linear components
sub ShiftRows {
my @x=@_[0..7];
my @t=@_[8..11];
my $mask=pop;
$code.=<<___;
vldmia $key!, {@t[0]-@t[3]}
veor @t[0], @t[0], @x[0]
veor @t[1], @t[1], @x[1]
vtbl.8 `&Dlo(@x[0])`, {@t[0]}, `&Dlo($mask)`
vtbl.8 `&Dhi(@x[0])`, {@t[0]}, `&Dhi($mask)`
vldmia $key!, {@t[0]}
veor @t[2], @t[2], @x[2]
vtbl.8 `&Dlo(@x[1])`, {@t[1]}, `&Dlo($mask)`
vtbl.8 `&Dhi(@x[1])`, {@t[1]}, `&Dhi($mask)`
vldmia $key!, {@t[1]}
veor @t[3], @t[3], @x[3]
vtbl.8 `&Dlo(@x[2])`, {@t[2]}, `&Dlo($mask)`
vtbl.8 `&Dhi(@x[2])`, {@t[2]}, `&Dhi($mask)`
vldmia $key!, {@t[2]}
vtbl.8 `&Dlo(@x[3])`, {@t[3]}, `&Dlo($mask)`
vtbl.8 `&Dhi(@x[3])`, {@t[3]}, `&Dhi($mask)`
vldmia $key!, {@t[3]}
veor @t[0], @t[0], @x[4]
veor @t[1], @t[1], @x[5]
vtbl.8 `&Dlo(@x[4])`, {@t[0]}, `&Dlo($mask)`
vtbl.8 `&Dhi(@x[4])`, {@t[0]}, `&Dhi($mask)`
veor @t[2], @t[2], @x[6]
vtbl.8 `&Dlo(@x[5])`, {@t[1]}, `&Dlo($mask)`
vtbl.8 `&Dhi(@x[5])`, {@t[1]}, `&Dhi($mask)`
veor @t[3], @t[3], @x[7]
vtbl.8 `&Dlo(@x[6])`, {@t[2]}, `&Dlo($mask)`
vtbl.8 `&Dhi(@x[6])`, {@t[2]}, `&Dhi($mask)`
vtbl.8 `&Dlo(@x[7])`, {@t[3]}, `&Dlo($mask)`
vtbl.8 `&Dhi(@x[7])`, {@t[3]}, `&Dhi($mask)`
___
}
sub MixColumns {
# modified to emit output in order suitable for feeding back to aesenc[last]
my @x=@_[0..7];
my @t=@_[8..15];
my $inv=@_[16]; # optional
$code.=<<___;
vext.8 @t[0], @x[0], @x[0], #12 @ x0 <<< 32
vext.8 @t[1], @x[1], @x[1], #12
veor @x[0], @x[0], @t[0] @ x0 ^ (x0 <<< 32)
vext.8 @t[2], @x[2], @x[2], #12
veor @x[1], @x[1], @t[1]
vext.8 @t[3], @x[3], @x[3], #12
veor @x[2], @x[2], @t[2]
vext.8 @t[4], @x[4], @x[4], #12
veor @x[3], @x[3], @t[3]
vext.8 @t[5], @x[5], @x[5], #12
veor @x[4], @x[4], @t[4]
vext.8 @t[6], @x[6], @x[6], #12
veor @x[5], @x[5], @t[5]
vext.8 @t[7], @x[7], @x[7], #12
veor @x[6], @x[6], @t[6]
veor @t[1], @t[1], @x[0]
veor @x[7], @x[7], @t[7]
vext.8 @x[0], @x[0], @x[0], #8 @ (x0 ^ (x0 <<< 32)) <<< 64)
veor @t[2], @t[2], @x[1]
veor @t[0], @t[0], @x[7]
veor @t[1], @t[1], @x[7]
vext.8 @x[1], @x[1], @x[1], #8
veor @t[5], @t[5], @x[4]
veor @x[0], @x[0], @t[0]
veor @t[6], @t[6], @x[5]
veor @x[1], @x[1], @t[1]
vext.8 @t[0], @x[4], @x[4], #8
veor @t[4], @t[4], @x[3]
vext.8 @t[1], @x[5], @x[5], #8
veor @t[7], @t[7], @x[6]
vext.8 @x[4], @x[3], @x[3], #8
veor @t[3], @t[3], @x[2]
vext.8 @x[5], @x[7], @x[7], #8
veor @t[4], @t[4], @x[7]
vext.8 @x[3], @x[6], @x[6], #8
veor @t[3], @t[3], @x[7]
vext.8 @x[6], @x[2], @x[2], #8
veor @x[7], @t[1], @t[5]
___
$code.=<<___ if (!$inv);
veor @x[2], @t[0], @t[4]
veor @x[4], @x[4], @t[3]
veor @x[5], @x[5], @t[7]
veor @x[3], @x[3], @t[6]
@ vmov @x[2], @t[0]
veor @x[6], @x[6], @t[2]
@ vmov @x[7], @t[1]
___
$code.=<<___ if ($inv);
veor @t[3], @t[3], @x[4]
veor @x[5], @x[5], @t[7]
veor @x[2], @x[3], @t[6]
veor @x[3], @t[0], @t[4]
veor @x[4], @x[6], @t[2]
vmov @x[6], @t[3]
@ vmov @x[7], @t[1]
___
}
sub InvMixColumns_orig {
my @x=@_[0..7];
my @t=@_[8..15];
$code.=<<___;
@ multiplication by 0x0e
vext.8 @t[7], @x[7], @x[7], #12
vmov @t[2], @x[2]
veor @x[2], @x[2], @x[5] @ 2 5
veor @x[7], @x[7], @x[5] @ 7 5
vext.8 @t[0], @x[0], @x[0], #12
vmov @t[5], @x[5]
veor @x[5], @x[5], @x[0] @ 5 0 [1]
veor @x[0], @x[0], @x[1] @ 0 1
vext.8 @t[1], @x[1], @x[1], #12
veor @x[1], @x[1], @x[2] @ 1 25
veor @x[0], @x[0], @x[6] @ 01 6 [2]
vext.8 @t[3], @x[3], @x[3], #12
veor @x[1], @x[1], @x[3] @ 125 3 [4]
veor @x[2], @x[2], @x[0] @ 25 016 [3]
veor @x[3], @x[3], @x[7] @ 3 75
veor @x[7], @x[7], @x[6] @ 75 6 [0]
vext.8 @t[6], @x[6], @x[6], #12
vmov @t[4], @x[4]
veor @x[6], @x[6], @x[4] @ 6 4
veor @x[4], @x[4], @x[3] @ 4 375 [6]
veor @x[3], @x[3], @x[7] @ 375 756=36
veor @x[6], @x[6], @t[5] @ 64 5 [7]
veor @x[3], @x[3], @t[2] @ 36 2
vext.8 @t[5], @t[5], @t[5], #12
veor @x[3], @x[3], @t[4] @ 362 4 [5]
___
my @y = @x[7,5,0,2,1,3,4,6];
$code.=<<___;
@ multiplication by 0x0b
veor @y[1], @y[1], @y[0]
veor @y[0], @y[0], @t[0]
vext.8 @t[2], @t[2], @t[2], #12
veor @y[1], @y[1], @t[1]
veor @y[0], @y[0], @t[5]
vext.8 @t[4], @t[4], @t[4], #12
veor @y[1], @y[1], @t[6]
veor @y[0], @y[0], @t[7]
veor @t[7], @t[7], @t[6] @ clobber t[7]
veor @y[3], @y[3], @t[0]
veor @y[1], @y[1], @y[0]
vext.8 @t[0], @t[0], @t[0], #12
veor @y[2], @y[2], @t[1]
veor @y[4], @y[4], @t[1]
vext.8 @t[1], @t[1], @t[1], #12
veor @y[2], @y[2], @t[2]
veor @y[3], @y[3], @t[2]
veor @y[5], @y[5], @t[2]
veor @y[2], @y[2], @t[7]
vext.8 @t[2], @t[2], @t[2], #12
veor @y[3], @y[3], @t[3]
veor @y[6], @y[6], @t[3]
veor @y[4], @y[4], @t[3]
veor @y[7], @y[7], @t[4]
vext.8 @t[3], @t[3], @t[3], #12
veor @y[5], @y[5], @t[4]
veor @y[7], @y[7], @t[7]
veor @t[7], @t[7], @t[5] @ clobber t[7] even more
veor @y[3], @y[3], @t[5]
veor @y[4], @y[4], @t[4]
veor @y[5], @y[5], @t[7]
vext.8 @t[4], @t[4], @t[4], #12
veor @y[6], @y[6], @t[7]
veor @y[4], @y[4], @t[7]
veor @t[7], @t[7], @t[5]
vext.8 @t[5], @t[5], @t[5], #12
@ multiplication by 0x0d
veor @y[4], @y[4], @y[7]
veor @t[7], @t[7], @t[6] @ restore t[7]
veor @y[7], @y[7], @t[4]
vext.8 @t[6], @t[6], @t[6], #12
veor @y[2], @y[2], @t[0]
veor @y[7], @y[7], @t[5]
vext.8 @t[7], @t[7], @t[7], #12
veor @y[2], @y[2], @t[2]
veor @y[3], @y[3], @y[1]
veor @y[1], @y[1], @t[1]
veor @y[0], @y[0], @t[0]
veor @y[3], @y[3], @t[0]
veor @y[1], @y[1], @t[5]
veor @y[0], @y[0], @t[5]
vext.8 @t[0], @t[0], @t[0], #12
veor @y[1], @y[1], @t[7]
veor @y[0], @y[0], @t[6]
veor @y[3], @y[3], @y[1]
veor @y[4], @y[4], @t[1]
vext.8 @t[1], @t[1], @t[1], #12
veor @y[7], @y[7], @t[7]
veor @y[4], @y[4], @t[2]
veor @y[5], @y[5], @t[2]
veor @y[2], @y[2], @t[6]
veor @t[6], @t[6], @t[3] @ clobber t[6]
vext.8 @t[2], @t[2], @t[2], #12
veor @y[4], @y[4], @y[7]
veor @y[3], @y[3], @t[6]
veor @y[6], @y[6], @t[6]
veor @y[5], @y[5], @t[5]
vext.8 @t[5], @t[5], @t[5], #12
veor @y[6], @y[6], @t[4]
vext.8 @t[4], @t[4], @t[4], #12
veor @y[5], @y[5], @t[6]
veor @y[6], @y[6], @t[7]
vext.8 @t[7], @t[7], @t[7], #12
veor @t[6], @t[6], @t[3] @ restore t[6]
vext.8 @t[3], @t[3], @t[3], #12
@ multiplication by 0x09
veor @y[4], @y[4], @y[1]
veor @t[1], @t[1], @y[1] @ t[1]=y[1]
veor @t[0], @t[0], @t[5] @ clobber t[0]
vext.8 @t[6], @t[6], @t[6], #12
veor @t[1], @t[1], @t[5]
veor @y[3], @y[3], @t[0]
veor @t[0], @t[0], @y[0] @ t[0]=y[0]
veor @t[1], @t[1], @t[6]
veor @t[6], @t[6], @t[7] @ clobber t[6]
veor @y[4], @y[4], @t[1]
veor @y[7], @y[7], @t[4]
veor @y[6], @y[6], @t[3]
veor @y[5], @y[5], @t[2]
veor @t[4], @t[4], @y[4] @ t[4]=y[4]
veor @t[3], @t[3], @y[3] @ t[3]=y[3]
veor @t[5], @t[5], @y[5] @ t[5]=y[5]
veor @t[2], @t[2], @y[2] @ t[2]=y[2]
veor @t[3], @t[3], @t[7]
veor @XMM[5], @t[5], @t[6]
veor @XMM[6], @t[6], @y[6] @ t[6]=y[6]
veor @XMM[2], @t[2], @t[6]
veor @XMM[7], @t[7], @y[7] @ t[7]=y[7]
vmov @XMM[0], @t[0]
vmov @XMM[1], @t[1]
@ vmov @XMM[2], @t[2]
vmov @XMM[3], @t[3]
vmov @XMM[4], @t[4]
@ vmov @XMM[5], @t[5]
@ vmov @XMM[6], @t[6]
@ vmov @XMM[7], @t[7]
___
}
sub InvMixColumns {
my @x=@_[0..7];
my @t=@_[8..15];
# Thanks to Jussi Kivilinna for providing pointer to
#
# | 0e 0b 0d 09 | | 02 03 01 01 | | 05 00 04 00 |
# | 09 0e 0b 0d | = | 01 02 03 01 | x | 00 05 00 04 |
# | 0d 09 0e 0b | | 01 01 02 03 | | 04 00 05 00 |
# | 0b 0d 09 0e | | 03 01 01 02 | | 00 04 00 05 |
$code.=<<___;
@ multiplication by 0x05-0x00-0x04-0x00
vext.8 @t[0], @x[0], @x[0], #8
vext.8 @t[6], @x[6], @x[6], #8
vext.8 @t[7], @x[7], @x[7], #8
veor @t[0], @t[0], @x[0]
vext.8 @t[1], @x[1], @x[1], #8
veor @t[6], @t[6], @x[6]
vext.8 @t[2], @x[2], @x[2], #8
veor @t[7], @t[7], @x[7]
vext.8 @t[3], @x[3], @x[3], #8
veor @t[1], @t[1], @x[1]
vext.8 @t[4], @x[4], @x[4], #8
veor @t[2], @t[2], @x[2]
vext.8 @t[5], @x[5], @x[5], #8
veor @t[3], @t[3], @x[3]
veor @t[4], @t[4], @x[4]
veor @t[5], @t[5], @x[5]
veor @x[0], @x[0], @t[6]
veor @x[1], @x[1], @t[6]
veor @x[2], @x[2], @t[0]
veor @x[4], @x[4], @t[2]
veor @x[3], @x[3], @t[1]
veor @x[1], @x[1], @t[7]
veor @x[2], @x[2], @t[7]
veor @x[4], @x[4], @t[6]
veor @x[5], @x[5], @t[3]
veor @x[3], @x[3], @t[6]
veor @x[6], @x[6], @t[4]
veor @x[4], @x[4], @t[7]
veor @x[5], @x[5], @t[7]
veor @x[7], @x[7], @t[5]
___
&MixColumns (@x,@t,1); # flipped 2<->3 and 4<->6
}
sub swapmove {
my ($a,$b,$n,$mask,$t)=@_;
$code.=<<___;
vshr.u64 $t, $b, #$n
veor $t, $t, $a
vand $t, $t, $mask
veor $a, $a, $t
vshl.u64 $t, $t, #$n
veor $b, $b, $t
___
}
sub swapmove2x {
my ($a0,$b0,$a1,$b1,$n,$mask,$t0,$t1)=@_;
$code.=<<___;
vshr.u64 $t0, $b0, #$n
vshr.u64 $t1, $b1, #$n
veor $t0, $t0, $a0
veor $t1, $t1, $a1
vand $t0, $t0, $mask
vand $t1, $t1, $mask
veor $a0, $a0, $t0
vshl.u64 $t0, $t0, #$n
veor $a1, $a1, $t1
vshl.u64 $t1, $t1, #$n
veor $b0, $b0, $t0
veor $b1, $b1, $t1
___
}
sub bitslice {
my @x=reverse(@_[0..7]);
my ($t0,$t1,$t2,$t3)=@_[8..11];
$code.=<<___;
vmov.i8 $t0,#0x55 @ compose .LBS0
vmov.i8 $t1,#0x33 @ compose .LBS1
___
&swapmove2x(@x[0,1,2,3],1,$t0,$t2,$t3);
&swapmove2x(@x[4,5,6,7],1,$t0,$t2,$t3);
$code.=<<___;
vmov.i8 $t0,#0x0f @ compose .LBS2
___
&swapmove2x(@x[0,2,1,3],2,$t1,$t2,$t3);
&swapmove2x(@x[4,6,5,7],2,$t1,$t2,$t3);
&swapmove2x(@x[0,4,1,5],4,$t0,$t2,$t3);
&swapmove2x(@x[2,6,3,7],4,$t0,$t2,$t3);
}
$code.=<<___;
#ifndef __KERNEL__
# include <openssl/arm_arch.h>
# define VFP_ABI_PUSH vstmdb sp!,{d8-d15}
# define VFP_ABI_POP vldmia sp!,{d8-d15}
# define VFP_ABI_FRAME 0x40
#else
# define VFP_ABI_PUSH
# define VFP_ABI_POP
# define VFP_ABI_FRAME 0
# define BSAES_ASM_EXTENDED_KEY
# define XTS_CHAIN_TWEAK
# define __ARM_ARCH__ __LINUX_ARM_ARCH__
# define __ARM_MAX_ARCH__ 7
#endif
#ifdef __thumb__
# define adrl adr
#endif
#if __ARM_MAX_ARCH__>=7
.arch armv7-a
.fpu neon
.text
.syntax unified @ ARMv7-capable assembler is expected to handle this
#if defined(__thumb2__) && !defined(__APPLE__)
.thumb
#else
.code 32
# undef __thumb2__
#endif
.type _bsaes_decrypt8,%function
.align 4
_bsaes_decrypt8:
adr $const,.
vldmia $key!, {@XMM[9]} @ round 0 key
#if defined(__thumb2__) || defined(__APPLE__)
adr $const,.LM0ISR
#else
add $const,$const,#.LM0ISR-_bsaes_decrypt8
#endif
vldmia $const!, {@XMM[8]} @ .LM0ISR
veor @XMM[10], @XMM[0], @XMM[9] @ xor with round0 key
veor @XMM[11], @XMM[1], @XMM[9]
vtbl.8 `&Dlo(@XMM[0])`, {@XMM[10]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[0])`, {@XMM[10]}, `&Dhi(@XMM[8])`
veor @XMM[12], @XMM[2], @XMM[9]
vtbl.8 `&Dlo(@XMM[1])`, {@XMM[11]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[1])`, {@XMM[11]}, `&Dhi(@XMM[8])`
veor @XMM[13], @XMM[3], @XMM[9]
vtbl.8 `&Dlo(@XMM[2])`, {@XMM[12]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[2])`, {@XMM[12]}, `&Dhi(@XMM[8])`
veor @XMM[14], @XMM[4], @XMM[9]
vtbl.8 `&Dlo(@XMM[3])`, {@XMM[13]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[3])`, {@XMM[13]}, `&Dhi(@XMM[8])`
veor @XMM[15], @XMM[5], @XMM[9]
vtbl.8 `&Dlo(@XMM[4])`, {@XMM[14]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[4])`, {@XMM[14]}, `&Dhi(@XMM[8])`
veor @XMM[10], @XMM[6], @XMM[9]
vtbl.8 `&Dlo(@XMM[5])`, {@XMM[15]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[5])`, {@XMM[15]}, `&Dhi(@XMM[8])`
veor @XMM[11], @XMM[7], @XMM[9]
vtbl.8 `&Dlo(@XMM[6])`, {@XMM[10]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[6])`, {@XMM[10]}, `&Dhi(@XMM[8])`
vtbl.8 `&Dlo(@XMM[7])`, {@XMM[11]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[7])`, {@XMM[11]}, `&Dhi(@XMM[8])`
___
&bitslice (@XMM[0..7, 8..11]);
$code.=<<___;
sub $rounds,$rounds,#1
b .Ldec_sbox
.align 4
.Ldec_loop:
___
&ShiftRows (@XMM[0..7, 8..12]);
$code.=".Ldec_sbox:\n";
&InvSbox (@XMM[0..7, 8..15]);
$code.=<<___;
subs $rounds,$rounds,#1
bcc .Ldec_done
___
&InvMixColumns (@XMM[0,1,6,4,2,7,3,5, 8..15]);
$code.=<<___;
vldmia $const, {@XMM[12]} @ .LISR
ite eq @ Thumb2 thing, sanity check in ARM
addeq $const,$const,#0x10
bne .Ldec_loop
vldmia $const, {@XMM[12]} @ .LISRM0
b .Ldec_loop
.align 4
.Ldec_done:
___
&bitslice (@XMM[0,1,6,4,2,7,3,5, 8..11]);
$code.=<<___;
vldmia $key, {@XMM[8]} @ last round key
veor @XMM[6], @XMM[6], @XMM[8]
veor @XMM[4], @XMM[4], @XMM[8]
veor @XMM[2], @XMM[2], @XMM[8]
veor @XMM[7], @XMM[7], @XMM[8]
veor @XMM[3], @XMM[3], @XMM[8]
veor @XMM[5], @XMM[5], @XMM[8]
veor @XMM[0], @XMM[0], @XMM[8]
veor @XMM[1], @XMM[1], @XMM[8]
bx lr
.size _bsaes_decrypt8,.-_bsaes_decrypt8
.type _bsaes_const,%object
.align 6
_bsaes_const:
.LM0ISR: @ InvShiftRows constants
.quad 0x0a0e0206070b0f03, 0x0004080c0d010509
.LISR:
.quad 0x0504070602010003, 0x0f0e0d0c080b0a09
.LISRM0:
.quad 0x01040b0e0205080f, 0x0306090c00070a0d
.LM0SR: @ ShiftRows constants
.quad 0x0a0e02060f03070b, 0x0004080c05090d01
.LSR:
.quad 0x0504070600030201, 0x0f0e0d0c0a09080b
.LSRM0:
.quad 0x0304090e00050a0f, 0x01060b0c0207080d
.LM0:
.quad 0x02060a0e03070b0f, 0x0004080c0105090d
.LREVM0SR:
.quad 0x090d01050c000408, 0x03070b0f060a0e02
.asciz "Bit-sliced AES for NEON, CRYPTOGAMS by <appro\@openssl.org>"
.align 6
.size _bsaes_const,.-_bsaes_const
.type _bsaes_encrypt8,%function
.align 4
_bsaes_encrypt8:
adr $const,.
vldmia $key!, {@XMM[9]} @ round 0 key
#if defined(__thumb2__) || defined(__APPLE__)
adr $const,.LM0SR
#else
sub $const,$const,#_bsaes_encrypt8-.LM0SR
#endif
vldmia $const!, {@XMM[8]} @ .LM0SR
_bsaes_encrypt8_alt:
veor @XMM[10], @XMM[0], @XMM[9] @ xor with round0 key
veor @XMM[11], @XMM[1], @XMM[9]
vtbl.8 `&Dlo(@XMM[0])`, {@XMM[10]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[0])`, {@XMM[10]}, `&Dhi(@XMM[8])`
veor @XMM[12], @XMM[2], @XMM[9]
vtbl.8 `&Dlo(@XMM[1])`, {@XMM[11]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[1])`, {@XMM[11]}, `&Dhi(@XMM[8])`
veor @XMM[13], @XMM[3], @XMM[9]
vtbl.8 `&Dlo(@XMM[2])`, {@XMM[12]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[2])`, {@XMM[12]}, `&Dhi(@XMM[8])`
veor @XMM[14], @XMM[4], @XMM[9]
vtbl.8 `&Dlo(@XMM[3])`, {@XMM[13]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[3])`, {@XMM[13]}, `&Dhi(@XMM[8])`
veor @XMM[15], @XMM[5], @XMM[9]
vtbl.8 `&Dlo(@XMM[4])`, {@XMM[14]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[4])`, {@XMM[14]}, `&Dhi(@XMM[8])`
veor @XMM[10], @XMM[6], @XMM[9]
vtbl.8 `&Dlo(@XMM[5])`, {@XMM[15]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[5])`, {@XMM[15]}, `&Dhi(@XMM[8])`
veor @XMM[11], @XMM[7], @XMM[9]
vtbl.8 `&Dlo(@XMM[6])`, {@XMM[10]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[6])`, {@XMM[10]}, `&Dhi(@XMM[8])`
vtbl.8 `&Dlo(@XMM[7])`, {@XMM[11]}, `&Dlo(@XMM[8])`
vtbl.8 `&Dhi(@XMM[7])`, {@XMM[11]}, `&Dhi(@XMM[8])`
_bsaes_encrypt8_bitslice:
___
&bitslice (@XMM[0..7, 8..11]);
$code.=<<___;
sub $rounds,$rounds,#1
b .Lenc_sbox
.align 4
.Lenc_loop:
___
&ShiftRows (@XMM[0..7, 8..12]);
$code.=".Lenc_sbox:\n";
&Sbox (@XMM[0..7, 8..15]);
$code.=<<___;
subs $rounds,$rounds,#1
bcc .Lenc_done
___
&MixColumns (@XMM[0,1,4,6,3,7,2,5, 8..15]);
$code.=<<___;
vldmia $const, {@XMM[12]} @ .LSR
ite eq @ Thumb2 thing, samity check in ARM
addeq $const,$const,#0x10
bne .Lenc_loop
vldmia $const, {@XMM[12]} @ .LSRM0
b .Lenc_loop
.align 4
.Lenc_done:
___
# output in lsb > [t0, t1, t4, t6, t3, t7, t2, t5] < msb
&bitslice (@XMM[0,1,4,6,3,7,2,5, 8..11]);
$code.=<<___;
vldmia $key, {@XMM[8]} @ last round key
veor @XMM[4], @XMM[4], @XMM[8]
veor @XMM[6], @XMM[6], @XMM[8]
veor @XMM[3], @XMM[3], @XMM[8]
veor @XMM[7], @XMM[7], @XMM[8]
veor @XMM[2], @XMM[2], @XMM[8]
veor @XMM[5], @XMM[5], @XMM[8]
veor @XMM[0], @XMM[0], @XMM[8]
veor @XMM[1], @XMM[1], @XMM[8]
bx lr
.size _bsaes_encrypt8,.-_bsaes_encrypt8
___
}
{
my ($out,$inp,$rounds,$const)=("r12","r4","r5","r6");
sub bitslice_key {
my @x=reverse(@_[0..7]);
my ($bs0,$bs1,$bs2,$t2,$t3)=@_[8..12];
&swapmove (@x[0,1],1,$bs0,$t2,$t3);
$code.=<<___;
@ &swapmove(@x[2,3],1,$t0,$t2,$t3);
vmov @x[2], @x[0]
vmov @x[3], @x[1]
___
#&swapmove2x(@x[4,5,6,7],1,$t0,$t2,$t3);
&swapmove2x (@x[0,2,1,3],2,$bs1,$t2,$t3);
$code.=<<___;
@ &swapmove2x(@x[4,6,5,7],2,$t1,$t2,$t3);
vmov @x[4], @x[0]
vmov @x[6], @x[2]
vmov @x[5], @x[1]
vmov @x[7], @x[3]
___
&swapmove2x (@x[0,4,1,5],4,$bs2,$t2,$t3);
&swapmove2x (@x[2,6,3,7],4,$bs2,$t2,$t3);
}
$code.=<<___;
.type _bsaes_key_convert,%function
.align 4
_bsaes_key_convert:
adr $const,.
vld1.8 {@XMM[7]}, [$inp]! @ load round 0 key
#if defined(__thumb2__) || defined(__APPLE__)
adr $const,.LM0
#else
sub $const,$const,#_bsaes_key_convert-.LM0
#endif
vld1.8 {@XMM[15]}, [$inp]! @ load round 1 key
vmov.i8 @XMM[8], #0x01 @ bit masks
vmov.i8 @XMM[9], #0x02
vmov.i8 @XMM[10], #0x04
vmov.i8 @XMM[11], #0x08
vmov.i8 @XMM[12], #0x10
vmov.i8 @XMM[13], #0x20
vldmia $const, {@XMM[14]} @ .LM0
#ifdef __ARMEL__
vrev32.8 @XMM[7], @XMM[7]
vrev32.8 @XMM[15], @XMM[15]
#endif
sub $rounds,$rounds,#1
vstmia $out!, {@XMM[7]} @ save round 0 key
b .Lkey_loop
.align 4
.Lkey_loop:
vtbl.8 `&Dlo(@XMM[7])`,{@XMM[15]},`&Dlo(@XMM[14])`
vtbl.8 `&Dhi(@XMM[7])`,{@XMM[15]},`&Dhi(@XMM[14])`
vmov.i8 @XMM[6], #0x40
vmov.i8 @XMM[15], #0x80
vtst.8 @XMM[0], @XMM[7], @XMM[8]
vtst.8 @XMM[1], @XMM[7], @XMM[9]
vtst.8 @XMM[2], @XMM[7], @XMM[10]
vtst.8 @XMM[3], @XMM[7], @XMM[11]
vtst.8 @XMM[4], @XMM[7], @XMM[12]
vtst.8 @XMM[5], @XMM[7], @XMM[13]
vtst.8 @XMM[6], @XMM[7], @XMM[6]
vtst.8 @XMM[7], @XMM[7], @XMM[15]
vld1.8 {@XMM[15]}, [$inp]! @ load next round key
vmvn @XMM[0], @XMM[0] @ "pnot"
vmvn @XMM[1], @XMM[1]
vmvn @XMM[5], @XMM[5]
vmvn @XMM[6], @XMM[6]
#ifdef __ARMEL__
vrev32.8 @XMM[15], @XMM[15]
#endif
subs $rounds,$rounds,#1
vstmia $out!,{@XMM[0]-@XMM[7]} @ write bit-sliced round key
bne .Lkey_loop
vmov.i8 @XMM[7],#0x63 @ compose .L63
@ don't save last round key
bx lr
.size _bsaes_key_convert,.-_bsaes_key_convert
___
}
if (0) { # following four functions are unsupported interface
# used for benchmarking...
$code.=<<___;
.globl bsaes_enc_key_convert
.type bsaes_enc_key_convert,%function
.align 4
bsaes_enc_key_convert:
stmdb sp!,{r4-r6,lr}
vstmdb sp!,{d8-d15} @ ABI specification says so
ldr r5,[$inp,#240] @ pass rounds
mov r4,$inp @ pass key
mov r12,$out @ pass key schedule
bl _bsaes_key_convert
veor @XMM[7],@XMM[7],@XMM[15] @ fix up last round key
vstmia r12, {@XMM[7]} @ save last round key
vldmia sp!,{d8-d15}
ldmia sp!,{r4-r6,pc}
.size bsaes_enc_key_convert,.-bsaes_enc_key_convert
.globl bsaes_encrypt_128
.type bsaes_encrypt_128,%function
.align 4
bsaes_encrypt_128:
stmdb sp!,{r4-r6,lr}
vstmdb sp!,{d8-d15} @ ABI specification says so
.Lenc128_loop:
vld1.8 {@XMM[0]-@XMM[1]}, [$inp]! @ load input
vld1.8 {@XMM[2]-@XMM[3]}, [$inp]!
mov r4,$key @ pass the key
vld1.8 {@XMM[4]-@XMM[5]}, [$inp]!
mov r5,#10 @ pass rounds
vld1.8 {@XMM[6]-@XMM[7]}, [$inp]!
bl _bsaes_encrypt8
vst1.8 {@XMM[0]-@XMM[1]}, [$out]! @ write output
vst1.8 {@XMM[4]}, [$out]!
vst1.8 {@XMM[6]}, [$out]!
vst1.8 {@XMM[3]}, [$out]!
vst1.8 {@XMM[7]}, [$out]!
vst1.8 {@XMM[2]}, [$out]!
subs $len,$len,#0x80
vst1.8 {@XMM[5]}, [$out]!
bhi .Lenc128_loop
vldmia sp!,{d8-d15}
ldmia sp!,{r4-r6,pc}
.size bsaes_encrypt_128,.-bsaes_encrypt_128
.globl bsaes_dec_key_convert
.type bsaes_dec_key_convert,%function
.align 4
bsaes_dec_key_convert:
stmdb sp!,{r4-r6,lr}
vstmdb sp!,{d8-d15} @ ABI specification says so
ldr r5,[$inp,#240] @ pass rounds
mov r4,$inp @ pass key
mov r12,$out @ pass key schedule
bl _bsaes_key_convert
vldmia $out, {@XMM[6]}
vstmia r12, {@XMM[15]} @ save last round key
veor @XMM[7], @XMM[7], @XMM[6] @ fix up round 0 key
vstmia $out, {@XMM[7]}
vldmia sp!,{d8-d15}
ldmia sp!,{r4-r6,pc}
.size bsaes_dec_key_convert,.-bsaes_dec_key_convert
.globl bsaes_decrypt_128
.type bsaes_decrypt_128,%function
.align 4
bsaes_decrypt_128:
stmdb sp!,{r4-r6,lr}
vstmdb sp!,{d8-d15} @ ABI specification says so
.Ldec128_loop:
vld1.8 {@XMM[0]-@XMM[1]}, [$inp]! @ load input
vld1.8 {@XMM[2]-@XMM[3]}, [$inp]!
mov r4,$key @ pass the key
vld1.8 {@XMM[4]-@XMM[5]}, [$inp]!
mov r5,#10 @ pass rounds
vld1.8 {@XMM[6]-@XMM[7]}, [$inp]!
bl _bsaes_decrypt8
vst1.8 {@XMM[0]-@XMM[1]}, [$out]! @ write output
vst1.8 {@XMM[6]}, [$out]!
vst1.8 {@XMM[4]}, [$out]!
vst1.8 {@XMM[2]}, [$out]!
vst1.8 {@XMM[7]}, [$out]!
vst1.8 {@XMM[3]}, [$out]!
subs $len,$len,#0x80
vst1.8 {@XMM[5]}, [$out]!
bhi .Ldec128_loop
vldmia sp!,{d8-d15}
ldmia sp!,{r4-r6,pc}
.size bsaes_decrypt_128,.-bsaes_decrypt_128
___
}
{
my ($inp,$out,$len,$key, $ivp,$fp,$rounds)=map("r$_",(0..3,8..10));
my ($keysched)=("sp");
$code.=<<___;
.extern AES_cbc_encrypt
.extern AES_decrypt
.global bsaes_cbc_encrypt
.type bsaes_cbc_encrypt,%function
.align 5
bsaes_cbc_encrypt:
#ifndef __KERNEL__
cmp $len, #128
#ifndef __thumb__
blo AES_cbc_encrypt
#else
bhs 1f
b AES_cbc_encrypt
1:
#endif
#endif
@ it is up to the caller to make sure we are called with enc == 0
mov ip, sp
stmdb sp!, {r4-r10, lr}
VFP_ABI_PUSH
ldr $ivp, [ip] @ IV is 1st arg on the stack
mov $len, $len, lsr#4 @ len in 16 byte blocks
sub sp, #0x10 @ scratch space to carry over the IV
mov $fp, sp @ save sp
ldr $rounds, [$key, #240] @ get # of rounds
#ifndef BSAES_ASM_EXTENDED_KEY
@ allocate the key schedule on the stack
sub r12, sp, $rounds, lsl#7 @ 128 bytes per inner round key
add r12, #`128-32` @ sifze of bit-slices key schedule
@ populate the key schedule
mov r4, $key @ pass key
mov r5, $rounds @ pass # of rounds
mov sp, r12 @ sp is $keysched
bl _bsaes_key_convert
vldmia $keysched, {@XMM[6]}
vstmia r12, {@XMM[15]} @ save last round key
veor @XMM[7], @XMM[7], @XMM[6] @ fix up round 0 key
vstmia $keysched, {@XMM[7]}
#else
ldr r12, [$key, #244]
eors r12, #1
beq 0f
@ populate the key schedule
str r12, [$key, #244]
mov r4, $key @ pass key
mov r5, $rounds @ pass # of rounds
add r12, $key, #248 @ pass key schedule
bl _bsaes_key_convert
add r4, $key, #248
vldmia r4, {@XMM[6]}
vstmia r12, {@XMM[15]} @ save last round key
veor @XMM[7], @XMM[7], @XMM[6] @ fix up round 0 key
vstmia r4, {@XMM[7]}
.align 2
0:
#endif
vld1.8 {@XMM[15]}, [$ivp] @ load IV
b .Lcbc_dec_loop
.align 4
.Lcbc_dec_loop:
subs $len, $len, #0x8
bmi .Lcbc_dec_loop_finish
vld1.8 {@XMM[0]-@XMM[1]}, [$inp]! @ load input
vld1.8 {@XMM[2]-@XMM[3]}, [$inp]!
#ifndef BSAES_ASM_EXTENDED_KEY
mov r4, $keysched @ pass the key
#else
add r4, $key, #248
#endif
vld1.8 {@XMM[4]-@XMM[5]}, [$inp]!
mov r5, $rounds
vld1.8 {@XMM[6]-@XMM[7]}, [$inp]
sub $inp, $inp, #0x60
vstmia $fp, {@XMM[15]} @ put aside IV
bl _bsaes_decrypt8
vldmia $fp, {@XMM[14]} @ reload IV
vld1.8 {@XMM[8]-@XMM[9]}, [$inp]! @ reload input
veor @XMM[0], @XMM[0], @XMM[14] @ ^= IV
vld1.8 {@XMM[10]-@XMM[11]}, [$inp]!
veor @XMM[1], @XMM[1], @XMM[8]
veor @XMM[6], @XMM[6], @XMM[9]
vld1.8 {@XMM[12]-@XMM[13]}, [$inp]!
veor @XMM[4], @XMM[4], @XMM[10]
veor @XMM[2], @XMM[2], @XMM[11]
vld1.8 {@XMM[14]-@XMM[15]}, [$inp]!
veor @XMM[7], @XMM[7], @XMM[12]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]! @ write output
veor @XMM[3], @XMM[3], @XMM[13]
vst1.8 {@XMM[6]}, [$out]!
veor @XMM[5], @XMM[5], @XMM[14]
vst1.8 {@XMM[4]}, [$out]!
vst1.8 {@XMM[2]}, [$out]!
vst1.8 {@XMM[7]}, [$out]!
vst1.8 {@XMM[3]}, [$out]!
vst1.8 {@XMM[5]}, [$out]!
b .Lcbc_dec_loop
.Lcbc_dec_loop_finish:
adds $len, $len, #8
beq .Lcbc_dec_done
vld1.8 {@XMM[0]}, [$inp]! @ load input
cmp $len, #2
blo .Lcbc_dec_one
vld1.8 {@XMM[1]}, [$inp]!
#ifndef BSAES_ASM_EXTENDED_KEY
mov r4, $keysched @ pass the key
#else
add r4, $key, #248
#endif
mov r5, $rounds
vstmia $fp, {@XMM[15]} @ put aside IV
beq .Lcbc_dec_two
vld1.8 {@XMM[2]}, [$inp]!
cmp $len, #4
blo .Lcbc_dec_three
vld1.8 {@XMM[3]}, [$inp]!
beq .Lcbc_dec_four
vld1.8 {@XMM[4]}, [$inp]!
cmp $len, #6
blo .Lcbc_dec_five
vld1.8 {@XMM[5]}, [$inp]!
beq .Lcbc_dec_six
vld1.8 {@XMM[6]}, [$inp]!
sub $inp, $inp, #0x70
bl _bsaes_decrypt8
vldmia $fp, {@XMM[14]} @ reload IV
vld1.8 {@XMM[8]-@XMM[9]}, [$inp]! @ reload input
veor @XMM[0], @XMM[0], @XMM[14] @ ^= IV
vld1.8 {@XMM[10]-@XMM[11]}, [$inp]!
veor @XMM[1], @XMM[1], @XMM[8]
veor @XMM[6], @XMM[6], @XMM[9]
vld1.8 {@XMM[12]-@XMM[13]}, [$inp]!
veor @XMM[4], @XMM[4], @XMM[10]
veor @XMM[2], @XMM[2], @XMM[11]
vld1.8 {@XMM[15]}, [$inp]!
veor @XMM[7], @XMM[7], @XMM[12]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]! @ write output
veor @XMM[3], @XMM[3], @XMM[13]
vst1.8 {@XMM[6]}, [$out]!
vst1.8 {@XMM[4]}, [$out]!
vst1.8 {@XMM[2]}, [$out]!
vst1.8 {@XMM[7]}, [$out]!
vst1.8 {@XMM[3]}, [$out]!
b .Lcbc_dec_done
.align 4
.Lcbc_dec_six:
sub $inp, $inp, #0x60
bl _bsaes_decrypt8
vldmia $fp,{@XMM[14]} @ reload IV
vld1.8 {@XMM[8]-@XMM[9]}, [$inp]! @ reload input
veor @XMM[0], @XMM[0], @XMM[14] @ ^= IV
vld1.8 {@XMM[10]-@XMM[11]}, [$inp]!
veor @XMM[1], @XMM[1], @XMM[8]
veor @XMM[6], @XMM[6], @XMM[9]
vld1.8 {@XMM[12]}, [$inp]!
veor @XMM[4], @XMM[4], @XMM[10]
veor @XMM[2], @XMM[2], @XMM[11]
vld1.8 {@XMM[15]}, [$inp]!
veor @XMM[7], @XMM[7], @XMM[12]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]! @ write output
vst1.8 {@XMM[6]}, [$out]!
vst1.8 {@XMM[4]}, [$out]!
vst1.8 {@XMM[2]}, [$out]!
vst1.8 {@XMM[7]}, [$out]!
b .Lcbc_dec_done
.align 4
.Lcbc_dec_five:
sub $inp, $inp, #0x50
bl _bsaes_decrypt8
vldmia $fp, {@XMM[14]} @ reload IV
vld1.8 {@XMM[8]-@XMM[9]}, [$inp]! @ reload input
veor @XMM[0], @XMM[0], @XMM[14] @ ^= IV
vld1.8 {@XMM[10]-@XMM[11]}, [$inp]!
veor @XMM[1], @XMM[1], @XMM[8]
veor @XMM[6], @XMM[6], @XMM[9]
vld1.8 {@XMM[15]}, [$inp]!
veor @XMM[4], @XMM[4], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]! @ write output
veor @XMM[2], @XMM[2], @XMM[11]
vst1.8 {@XMM[6]}, [$out]!
vst1.8 {@XMM[4]}, [$out]!
vst1.8 {@XMM[2]}, [$out]!
b .Lcbc_dec_done
.align 4
.Lcbc_dec_four:
sub $inp, $inp, #0x40
bl _bsaes_decrypt8
vldmia $fp, {@XMM[14]} @ reload IV
vld1.8 {@XMM[8]-@XMM[9]}, [$inp]! @ reload input
veor @XMM[0], @XMM[0], @XMM[14] @ ^= IV
vld1.8 {@XMM[10]}, [$inp]!
veor @XMM[1], @XMM[1], @XMM[8]
veor @XMM[6], @XMM[6], @XMM[9]
vld1.8 {@XMM[15]}, [$inp]!
veor @XMM[4], @XMM[4], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]! @ write output
vst1.8 {@XMM[6]}, [$out]!
vst1.8 {@XMM[4]}, [$out]!
b .Lcbc_dec_done
.align 4
.Lcbc_dec_three:
sub $inp, $inp, #0x30
bl _bsaes_decrypt8
vldmia $fp, {@XMM[14]} @ reload IV
vld1.8 {@XMM[8]-@XMM[9]}, [$inp]! @ reload input
veor @XMM[0], @XMM[0], @XMM[14] @ ^= IV
vld1.8 {@XMM[15]}, [$inp]!
veor @XMM[1], @XMM[1], @XMM[8]
veor @XMM[6], @XMM[6], @XMM[9]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]! @ write output
vst1.8 {@XMM[6]}, [$out]!
b .Lcbc_dec_done
.align 4
.Lcbc_dec_two:
sub $inp, $inp, #0x20
bl _bsaes_decrypt8
vldmia $fp, {@XMM[14]} @ reload IV
vld1.8 {@XMM[8]}, [$inp]! @ reload input
veor @XMM[0], @XMM[0], @XMM[14] @ ^= IV
vld1.8 {@XMM[15]}, [$inp]! @ reload input
veor @XMM[1], @XMM[1], @XMM[8]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]! @ write output
b .Lcbc_dec_done
.align 4
.Lcbc_dec_one:
sub $inp, $inp, #0x10
mov $rounds, $out @ save original out pointer
mov $out, $fp @ use the iv scratch space as out buffer
mov r2, $key
vmov @XMM[4],@XMM[15] @ just in case ensure that IV
vmov @XMM[5],@XMM[0] @ and input are preserved
bl AES_decrypt
vld1.8 {@XMM[0]}, [$fp] @ load result
veor @XMM[0], @XMM[0], @XMM[4] @ ^= IV
vmov @XMM[15], @XMM[5] @ @XMM[5] holds input
vst1.8 {@XMM[0]}, [$rounds] @ write output
.Lcbc_dec_done:
#ifndef BSAES_ASM_EXTENDED_KEY
vmov.i32 q0, #0
vmov.i32 q1, #0
.Lcbc_dec_bzero: @ wipe key schedule [if any]
vstmia $keysched!, {q0-q1}
cmp $keysched, $fp
bne .Lcbc_dec_bzero
#endif
mov sp, $fp
add sp, #0x10 @ add sp,$fp,#0x10 is no good for thumb
vst1.8 {@XMM[15]}, [$ivp] @ return IV
VFP_ABI_POP
ldmia sp!, {r4-r10, pc}
.size bsaes_cbc_encrypt,.-bsaes_cbc_encrypt
___
}
{
my ($inp,$out,$len,$key, $ctr,$fp,$rounds)=(map("r$_",(0..3,8..10)));
my $const = "r6"; # shared with _bsaes_encrypt8_alt
my $keysched = "sp";
$code.=<<___;
.extern AES_encrypt
.global bsaes_ctr32_encrypt_blocks
.type bsaes_ctr32_encrypt_blocks,%function
.align 5
bsaes_ctr32_encrypt_blocks:
cmp $len, #8 @ use plain AES for
blo .Lctr_enc_short @ small sizes
mov ip, sp
stmdb sp!, {r4-r10, lr}
VFP_ABI_PUSH
ldr $ctr, [ip] @ ctr is 1st arg on the stack
sub sp, sp, #0x10 @ scratch space to carry over the ctr
mov $fp, sp @ save sp
ldr $rounds, [$key, #240] @ get # of rounds
#ifndef BSAES_ASM_EXTENDED_KEY
@ allocate the key schedule on the stack
sub r12, sp, $rounds, lsl#7 @ 128 bytes per inner round key
add r12, #`128-32` @ size of bit-sliced key schedule
@ populate the key schedule
mov r4, $key @ pass key
mov r5, $rounds @ pass # of rounds
mov sp, r12 @ sp is $keysched
bl _bsaes_key_convert
veor @XMM[7],@XMM[7],@XMM[15] @ fix up last round key
vstmia r12, {@XMM[7]} @ save last round key
vld1.8 {@XMM[0]}, [$ctr] @ load counter
#ifdef __APPLE__
mov $ctr, #:lower16:(.LREVM0SR-.LM0)
add $ctr, $const, $ctr
#else
add $ctr, $const, #.LREVM0SR-.LM0 @ borrow $ctr
#endif
vldmia $keysched, {@XMM[4]} @ load round0 key
#else
ldr r12, [$key, #244]
eors r12, #1
beq 0f
@ populate the key schedule
str r12, [$key, #244]
mov r4, $key @ pass key
mov r5, $rounds @ pass # of rounds
add r12, $key, #248 @ pass key schedule
bl _bsaes_key_convert
veor @XMM[7],@XMM[7],@XMM[15] @ fix up last round key
vstmia r12, {@XMM[7]} @ save last round key
.align 2
0: add r12, $key, #248
vld1.8 {@XMM[0]}, [$ctr] @ load counter
adrl $ctr, .LREVM0SR @ borrow $ctr
vldmia r12, {@XMM[4]} @ load round0 key
sub sp, #0x10 @ place for adjusted round0 key
#endif
vmov.i32 @XMM[8],#1 @ compose 1<<96
veor @XMM[9],@XMM[9],@XMM[9]
vrev32.8 @XMM[0],@XMM[0]
vext.8 @XMM[8],@XMM[9],@XMM[8],#4
vrev32.8 @XMM[4],@XMM[4]
vadd.u32 @XMM[9],@XMM[8],@XMM[8] @ compose 2<<96
vstmia $keysched, {@XMM[4]} @ save adjusted round0 key
b .Lctr_enc_loop
.align 4
.Lctr_enc_loop:
vadd.u32 @XMM[10], @XMM[8], @XMM[9] @ compose 3<<96
vadd.u32 @XMM[1], @XMM[0], @XMM[8] @ +1
vadd.u32 @XMM[2], @XMM[0], @XMM[9] @ +2
vadd.u32 @XMM[3], @XMM[0], @XMM[10] @ +3
vadd.u32 @XMM[4], @XMM[1], @XMM[10]
vadd.u32 @XMM[5], @XMM[2], @XMM[10]
vadd.u32 @XMM[6], @XMM[3], @XMM[10]
vadd.u32 @XMM[7], @XMM[4], @XMM[10]
vadd.u32 @XMM[10], @XMM[5], @XMM[10] @ next counter
@ Borrow prologue from _bsaes_encrypt8 to use the opportunity
@ to flip byte order in 32-bit counter
vldmia $keysched, {@XMM[9]} @ load round0 key
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, $keysched, #0x10 @ pass next round key
#else
add r4, $key, #`248+16`
#endif
vldmia $ctr, {@XMM[8]} @ .LREVM0SR
mov r5, $rounds @ pass rounds
vstmia $fp, {@XMM[10]} @ save next counter
#ifdef __APPLE__
mov $const, #:lower16:(.LREVM0SR-.LSR)
sub $const, $ctr, $const
#else
sub $const, $ctr, #.LREVM0SR-.LSR @ pass constants
#endif
bl _bsaes_encrypt8_alt
subs $len, $len, #8
blo .Lctr_enc_loop_done
vld1.8 {@XMM[8]-@XMM[9]}, [$inp]! @ load input
vld1.8 {@XMM[10]-@XMM[11]}, [$inp]!
veor @XMM[0], @XMM[8]
veor @XMM[1], @XMM[9]
vld1.8 {@XMM[12]-@XMM[13]}, [$inp]!
veor @XMM[4], @XMM[10]
veor @XMM[6], @XMM[11]
vld1.8 {@XMM[14]-@XMM[15]}, [$inp]!
veor @XMM[3], @XMM[12]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]! @ write output
veor @XMM[7], @XMM[13]
veor @XMM[2], @XMM[14]
vst1.8 {@XMM[4]}, [$out]!
veor @XMM[5], @XMM[15]
vst1.8 {@XMM[6]}, [$out]!
vmov.i32 @XMM[8], #1 @ compose 1<<96
vst1.8 {@XMM[3]}, [$out]!
veor @XMM[9], @XMM[9], @XMM[9]
vst1.8 {@XMM[7]}, [$out]!
vext.8 @XMM[8], @XMM[9], @XMM[8], #4
vst1.8 {@XMM[2]}, [$out]!
vadd.u32 @XMM[9],@XMM[8],@XMM[8] @ compose 2<<96
vst1.8 {@XMM[5]}, [$out]!
vldmia $fp, {@XMM[0]} @ load counter
bne .Lctr_enc_loop
b .Lctr_enc_done
.align 4
.Lctr_enc_loop_done:
add $len, $len, #8
vld1.8 {@XMM[8]}, [$inp]! @ load input
veor @XMM[0], @XMM[8]
vst1.8 {@XMM[0]}, [$out]! @ write output
cmp $len, #2
blo .Lctr_enc_done
vld1.8 {@XMM[9]}, [$inp]!
veor @XMM[1], @XMM[9]
vst1.8 {@XMM[1]}, [$out]!
beq .Lctr_enc_done
vld1.8 {@XMM[10]}, [$inp]!
veor @XMM[4], @XMM[10]
vst1.8 {@XMM[4]}, [$out]!
cmp $len, #4
blo .Lctr_enc_done
vld1.8 {@XMM[11]}, [$inp]!
veor @XMM[6], @XMM[11]
vst1.8 {@XMM[6]}, [$out]!
beq .Lctr_enc_done
vld1.8 {@XMM[12]}, [$inp]!
veor @XMM[3], @XMM[12]
vst1.8 {@XMM[3]}, [$out]!
cmp $len, #6
blo .Lctr_enc_done
vld1.8 {@XMM[13]}, [$inp]!
veor @XMM[7], @XMM[13]
vst1.8 {@XMM[7]}, [$out]!
beq .Lctr_enc_done
vld1.8 {@XMM[14]}, [$inp]
veor @XMM[2], @XMM[14]
vst1.8 {@XMM[2]}, [$out]!
.Lctr_enc_done:
vmov.i32 q0, #0
vmov.i32 q1, #0
#ifndef BSAES_ASM_EXTENDED_KEY
.Lctr_enc_bzero: @ wipe key schedule [if any]
vstmia $keysched!, {q0-q1}
cmp $keysched, $fp
bne .Lctr_enc_bzero
#else
vstmia $keysched, {q0-q1}
#endif
mov sp, $fp
add sp, #0x10 @ add sp,$fp,#0x10 is no good for thumb
VFP_ABI_POP
ldmia sp!, {r4-r10, pc} @ return
.align 4
.Lctr_enc_short:
ldr ip, [sp] @ ctr pointer is passed on stack
stmdb sp!, {r4-r8, lr}
mov r4, $inp @ copy arguments
mov r5, $out
mov r6, $len
mov r7, $key
ldr r8, [ip, #12] @ load counter LSW
vld1.8 {@XMM[1]}, [ip] @ load whole counter value
#ifdef __ARMEL__
rev r8, r8
#endif
sub sp, sp, #0x10
vst1.8 {@XMM[1]}, [sp] @ copy counter value
sub sp, sp, #0x10
.Lctr_enc_short_loop:
add r0, sp, #0x10 @ input counter value
mov r1, sp @ output on the stack
mov r2, r7 @ key
bl AES_encrypt
vld1.8 {@XMM[0]}, [r4]! @ load input
vld1.8 {@XMM[1]}, [sp] @ load encrypted counter
add r8, r8, #1
#ifdef __ARMEL__
rev r0, r8
str r0, [sp, #0x1c] @ next counter value
#else
str r8, [sp, #0x1c] @ next counter value
#endif
veor @XMM[0],@XMM[0],@XMM[1]
vst1.8 {@XMM[0]}, [r5]! @ store output
subs r6, r6, #1
bne .Lctr_enc_short_loop
vmov.i32 q0, #0
vmov.i32 q1, #0
vstmia sp!, {q0-q1}
ldmia sp!, {r4-r8, pc}
.size bsaes_ctr32_encrypt_blocks,.-bsaes_ctr32_encrypt_blocks
___
}
{
######################################################################
# void bsaes_xts_[en|de]crypt(const char *inp,char *out,size_t len,
# const AES_KEY *key1, const AES_KEY *key2,
# const unsigned char iv[16]);
#
my ($inp,$out,$len,$key,$rounds,$magic,$fp)=(map("r$_",(7..10,1..3)));
my $const="r6"; # returned by _bsaes_key_convert
my $twmask=@XMM[5];
my @T=@XMM[6..7];
$code.=<<___;
.globl bsaes_xts_encrypt
.type bsaes_xts_encrypt,%function
.align 4
bsaes_xts_encrypt:
mov ip, sp
stmdb sp!, {r4-r10, lr} @ 0x20
VFP_ABI_PUSH
mov r6, sp @ future $fp
mov $inp, r0
mov $out, r1
mov $len, r2
mov $key, r3
sub r0, sp, #0x10 @ 0x10
bic r0, #0xf @ align at 16 bytes
mov sp, r0
#ifdef XTS_CHAIN_TWEAK
ldr r0, [ip] @ pointer to input tweak
#else
@ generate initial tweak
ldr r0, [ip, #4] @ iv[]
mov r1, sp
ldr r2, [ip, #0] @ key2
bl AES_encrypt
mov r0,sp @ pointer to initial tweak
#endif
ldr $rounds, [$key, #240] @ get # of rounds
mov $fp, r6
#ifndef BSAES_ASM_EXTENDED_KEY
@ allocate the key schedule on the stack
sub r12, sp, $rounds, lsl#7 @ 128 bytes per inner round key
@ add r12, #`128-32` @ size of bit-sliced key schedule
sub r12, #`32+16` @ place for tweak[9]
@ populate the key schedule
mov r4, $key @ pass key
mov r5, $rounds @ pass # of rounds
mov sp, r12
add r12, #0x90 @ pass key schedule
bl _bsaes_key_convert
veor @XMM[7], @XMM[7], @XMM[15] @ fix up last round key
vstmia r12, {@XMM[7]} @ save last round key
#else
ldr r12, [$key, #244]
eors r12, #1
beq 0f
str r12, [$key, #244]
mov r4, $key @ pass key
mov r5, $rounds @ pass # of rounds
add r12, $key, #248 @ pass key schedule
bl _bsaes_key_convert
veor @XMM[7], @XMM[7], @XMM[15] @ fix up last round key
vstmia r12, {@XMM[7]}
.align 2
0: sub sp, #0x90 @ place for tweak[9]
#endif
vld1.8 {@XMM[8]}, [r0] @ initial tweak
adr $magic, .Lxts_magic
subs $len, #0x80
blo .Lxts_enc_short
b .Lxts_enc_loop
.align 4
.Lxts_enc_loop:
vldmia $magic, {$twmask} @ load XTS magic
vshr.s64 @T[0], @XMM[8], #63
mov r0, sp
vand @T[0], @T[0], $twmask
___
for($i=9;$i<16;$i++) {
$code.=<<___;
vadd.u64 @XMM[$i], @XMM[$i-1], @XMM[$i-1]
vst1.64 {@XMM[$i-1]}, [r0,:128]!
vswp `&Dhi("@T[0]")`,`&Dlo("@T[0]")`
vshr.s64 @T[1], @XMM[$i], #63
veor @XMM[$i], @XMM[$i], @T[0]
vand @T[1], @T[1], $twmask
___
@T=reverse(@T);
$code.=<<___ if ($i>=10);
vld1.8 {@XMM[$i-10]}, [$inp]!
___
$code.=<<___ if ($i>=11);
veor @XMM[$i-11], @XMM[$i-11], @XMM[$i-3]
___
}
$code.=<<___;
vadd.u64 @XMM[8], @XMM[15], @XMM[15]
vst1.64 {@XMM[15]}, [r0,:128]!
vswp `&Dhi("@T[0]")`,`&Dlo("@T[0]")`
veor @XMM[8], @XMM[8], @T[0]
vst1.64 {@XMM[8]}, [r0,:128] @ next round tweak
vld1.8 {@XMM[6]-@XMM[7]}, [$inp]!
veor @XMM[5], @XMM[5], @XMM[13]
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, sp, #0x90 @ pass key schedule
#else
add r4, $key, #248 @ pass key schedule
#endif
veor @XMM[6], @XMM[6], @XMM[14]
mov r5, $rounds @ pass rounds
veor @XMM[7], @XMM[7], @XMM[15]
mov r0, sp
bl _bsaes_encrypt8
vld1.64 {@XMM[ 8]-@XMM[ 9]}, [r0,:128]!
vld1.64 {@XMM[10]-@XMM[11]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
vld1.64 {@XMM[12]-@XMM[13]}, [r0,:128]!
veor @XMM[1], @XMM[1], @XMM[ 9]
veor @XMM[8], @XMM[4], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]!
veor @XMM[9], @XMM[6], @XMM[11]
vld1.64 {@XMM[14]-@XMM[15]}, [r0,:128]!
veor @XMM[10], @XMM[3], @XMM[12]
vst1.8 {@XMM[8]-@XMM[9]}, [$out]!
veor @XMM[11], @XMM[7], @XMM[13]
veor @XMM[12], @XMM[2], @XMM[14]
vst1.8 {@XMM[10]-@XMM[11]}, [$out]!
veor @XMM[13], @XMM[5], @XMM[15]
vst1.8 {@XMM[12]-@XMM[13]}, [$out]!
vld1.64 {@XMM[8]}, [r0,:128] @ next round tweak
subs $len, #0x80
bpl .Lxts_enc_loop
.Lxts_enc_short:
adds $len, #0x70
bmi .Lxts_enc_done
vldmia $magic, {$twmask} @ load XTS magic
vshr.s64 @T[0], @XMM[8], #63
mov r0, sp
vand @T[0], @T[0], $twmask
___
for($i=9;$i<16;$i++) {
$code.=<<___;
vadd.u64 @XMM[$i], @XMM[$i-1], @XMM[$i-1]
vst1.64 {@XMM[$i-1]}, [r0,:128]!
vswp `&Dhi("@T[0]")`,`&Dlo("@T[0]")`
vshr.s64 @T[1], @XMM[$i], #63
veor @XMM[$i], @XMM[$i], @T[0]
vand @T[1], @T[1], $twmask
___
@T=reverse(@T);
$code.=<<___ if ($i>=10);
vld1.8 {@XMM[$i-10]}, [$inp]!
subs $len, #0x10
bmi .Lxts_enc_`$i-9`
___
$code.=<<___ if ($i>=11);
veor @XMM[$i-11], @XMM[$i-11], @XMM[$i-3]
___
}
$code.=<<___;
sub $len, #0x10
vst1.64 {@XMM[15]}, [r0,:128] @ next round tweak
vld1.8 {@XMM[6]}, [$inp]!
veor @XMM[5], @XMM[5], @XMM[13]
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, sp, #0x90 @ pass key schedule
#else
add r4, $key, #248 @ pass key schedule
#endif
veor @XMM[6], @XMM[6], @XMM[14]
mov r5, $rounds @ pass rounds
mov r0, sp
bl _bsaes_encrypt8
vld1.64 {@XMM[ 8]-@XMM[ 9]}, [r0,:128]!
vld1.64 {@XMM[10]-@XMM[11]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
vld1.64 {@XMM[12]-@XMM[13]}, [r0,:128]!
veor @XMM[1], @XMM[1], @XMM[ 9]
veor @XMM[8], @XMM[4], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]!
veor @XMM[9], @XMM[6], @XMM[11]
vld1.64 {@XMM[14]}, [r0,:128]!
veor @XMM[10], @XMM[3], @XMM[12]
vst1.8 {@XMM[8]-@XMM[9]}, [$out]!
veor @XMM[11], @XMM[7], @XMM[13]
veor @XMM[12], @XMM[2], @XMM[14]
vst1.8 {@XMM[10]-@XMM[11]}, [$out]!
vst1.8 {@XMM[12]}, [$out]!
vld1.64 {@XMM[8]}, [r0,:128] @ next round tweak
b .Lxts_enc_done
.align 4
.Lxts_enc_6:
veor @XMM[4], @XMM[4], @XMM[12]
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, sp, #0x90 @ pass key schedule
#else
add r4, $key, #248 @ pass key schedule
#endif
veor @XMM[5], @XMM[5], @XMM[13]
mov r5, $rounds @ pass rounds
mov r0, sp
bl _bsaes_encrypt8
vld1.64 {@XMM[ 8]-@XMM[ 9]}, [r0,:128]!
vld1.64 {@XMM[10]-@XMM[11]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
vld1.64 {@XMM[12]-@XMM[13]}, [r0,:128]!
veor @XMM[1], @XMM[1], @XMM[ 9]
veor @XMM[8], @XMM[4], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]!
veor @XMM[9], @XMM[6], @XMM[11]
veor @XMM[10], @XMM[3], @XMM[12]
vst1.8 {@XMM[8]-@XMM[9]}, [$out]!
veor @XMM[11], @XMM[7], @XMM[13]
vst1.8 {@XMM[10]-@XMM[11]}, [$out]!
vld1.64 {@XMM[8]}, [r0,:128] @ next round tweak
b .Lxts_enc_done
@ put this in range for both ARM and Thumb mode adr instructions
.align 5
.Lxts_magic:
.quad 1, 0x87
.align 5
.Lxts_enc_5:
veor @XMM[3], @XMM[3], @XMM[11]
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, sp, #0x90 @ pass key schedule
#else
add r4, $key, #248 @ pass key schedule
#endif
veor @XMM[4], @XMM[4], @XMM[12]
mov r5, $rounds @ pass rounds
mov r0, sp
bl _bsaes_encrypt8
vld1.64 {@XMM[ 8]-@XMM[ 9]}, [r0,:128]!
vld1.64 {@XMM[10]-@XMM[11]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
vld1.64 {@XMM[12]}, [r0,:128]!
veor @XMM[1], @XMM[1], @XMM[ 9]
veor @XMM[8], @XMM[4], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]!
veor @XMM[9], @XMM[6], @XMM[11]
veor @XMM[10], @XMM[3], @XMM[12]
vst1.8 {@XMM[8]-@XMM[9]}, [$out]!
vst1.8 {@XMM[10]}, [$out]!
vld1.64 {@XMM[8]}, [r0,:128] @ next round tweak
b .Lxts_enc_done
.align 4
.Lxts_enc_4:
veor @XMM[2], @XMM[2], @XMM[10]
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, sp, #0x90 @ pass key schedule
#else
add r4, $key, #248 @ pass key schedule
#endif
veor @XMM[3], @XMM[3], @XMM[11]
mov r5, $rounds @ pass rounds
mov r0, sp
bl _bsaes_encrypt8
vld1.64 {@XMM[ 8]-@XMM[ 9]}, [r0,:128]!
vld1.64 {@XMM[10]-@XMM[11]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
veor @XMM[1], @XMM[1], @XMM[ 9]
veor @XMM[8], @XMM[4], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]!
veor @XMM[9], @XMM[6], @XMM[11]
vst1.8 {@XMM[8]-@XMM[9]}, [$out]!
vld1.64 {@XMM[8]}, [r0,:128] @ next round tweak
b .Lxts_enc_done
.align 4
.Lxts_enc_3:
veor @XMM[1], @XMM[1], @XMM[9]
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, sp, #0x90 @ pass key schedule
#else
add r4, $key, #248 @ pass key schedule
#endif
veor @XMM[2], @XMM[2], @XMM[10]
mov r5, $rounds @ pass rounds
mov r0, sp
bl _bsaes_encrypt8
vld1.64 {@XMM[8]-@XMM[9]}, [r0,:128]!
vld1.64 {@XMM[10]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
veor @XMM[1], @XMM[1], @XMM[ 9]
veor @XMM[8], @XMM[4], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]!
vst1.8 {@XMM[8]}, [$out]!
vld1.64 {@XMM[8]}, [r0,:128] @ next round tweak
b .Lxts_enc_done
.align 4
.Lxts_enc_2:
veor @XMM[0], @XMM[0], @XMM[8]
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, sp, #0x90 @ pass key schedule
#else
add r4, $key, #248 @ pass key schedule
#endif
veor @XMM[1], @XMM[1], @XMM[9]
mov r5, $rounds @ pass rounds
mov r0, sp
bl _bsaes_encrypt8
vld1.64 {@XMM[8]-@XMM[9]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
veor @XMM[1], @XMM[1], @XMM[ 9]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]!
vld1.64 {@XMM[8]}, [r0,:128] @ next round tweak
b .Lxts_enc_done
.align 4
.Lxts_enc_1:
mov r0, sp
veor @XMM[0], @XMM[0], @XMM[8]
mov r1, sp
vst1.8 {@XMM[0]}, [sp,:128]
mov r2, $key
mov r4, $fp @ preserve fp
bl AES_encrypt
vld1.8 {@XMM[0]}, [sp,:128]
veor @XMM[0], @XMM[0], @XMM[8]
vst1.8 {@XMM[0]}, [$out]!
mov $fp, r4
vmov @XMM[8], @XMM[9] @ next round tweak
.Lxts_enc_done:
#ifndef XTS_CHAIN_TWEAK
adds $len, #0x10
beq .Lxts_enc_ret
sub r6, $out, #0x10
.Lxts_enc_steal:
ldrb r0, [$inp], #1
ldrb r1, [$out, #-0x10]
strb r0, [$out, #-0x10]
strb r1, [$out], #1
subs $len, #1
bhi .Lxts_enc_steal
vld1.8 {@XMM[0]}, [r6]
mov r0, sp
veor @XMM[0], @XMM[0], @XMM[8]
mov r1, sp
vst1.8 {@XMM[0]}, [sp,:128]
mov r2, $key
mov r4, $fp @ preserve fp
bl AES_encrypt
vld1.8 {@XMM[0]}, [sp,:128]
veor @XMM[0], @XMM[0], @XMM[8]
vst1.8 {@XMM[0]}, [r6]
mov $fp, r4
#endif
.Lxts_enc_ret:
bic r0, $fp, #0xf
vmov.i32 q0, #0
vmov.i32 q1, #0
#ifdef XTS_CHAIN_TWEAK
ldr r1, [$fp, #0x20+VFP_ABI_FRAME] @ chain tweak
#endif
.Lxts_enc_bzero: @ wipe key schedule [if any]
vstmia sp!, {q0-q1}
cmp sp, r0
bne .Lxts_enc_bzero
mov sp, $fp
#ifdef XTS_CHAIN_TWEAK
vst1.8 {@XMM[8]}, [r1]
#endif
VFP_ABI_POP
ldmia sp!, {r4-r10, pc} @ return
.size bsaes_xts_encrypt,.-bsaes_xts_encrypt
.globl bsaes_xts_decrypt
.type bsaes_xts_decrypt,%function
.align 4
bsaes_xts_decrypt:
mov ip, sp
stmdb sp!, {r4-r10, lr} @ 0x20
VFP_ABI_PUSH
mov r6, sp @ future $fp
mov $inp, r0
mov $out, r1
mov $len, r2
mov $key, r3
sub r0, sp, #0x10 @ 0x10
bic r0, #0xf @ align at 16 bytes
mov sp, r0
#ifdef XTS_CHAIN_TWEAK
ldr r0, [ip] @ pointer to input tweak
#else
@ generate initial tweak
ldr r0, [ip, #4] @ iv[]
mov r1, sp
ldr r2, [ip, #0] @ key2
bl AES_encrypt
mov r0, sp @ pointer to initial tweak
#endif
ldr $rounds, [$key, #240] @ get # of rounds
mov $fp, r6
#ifndef BSAES_ASM_EXTENDED_KEY
@ allocate the key schedule on the stack
sub r12, sp, $rounds, lsl#7 @ 128 bytes per inner round key
@ add r12, #`128-32` @ size of bit-sliced key schedule
sub r12, #`32+16` @ place for tweak[9]
@ populate the key schedule
mov r4, $key @ pass key
mov r5, $rounds @ pass # of rounds
mov sp, r12
add r12, #0x90 @ pass key schedule
bl _bsaes_key_convert
add r4, sp, #0x90
vldmia r4, {@XMM[6]}
vstmia r12, {@XMM[15]} @ save last round key
veor @XMM[7], @XMM[7], @XMM[6] @ fix up round 0 key
vstmia r4, {@XMM[7]}
#else
ldr r12, [$key, #244]
eors r12, #1
beq 0f
str r12, [$key, #244]
mov r4, $key @ pass key
mov r5, $rounds @ pass # of rounds
add r12, $key, #248 @ pass key schedule
bl _bsaes_key_convert
add r4, $key, #248
vldmia r4, {@XMM[6]}
vstmia r12, {@XMM[15]} @ save last round key
veor @XMM[7], @XMM[7], @XMM[6] @ fix up round 0 key
vstmia r4, {@XMM[7]}
.align 2
0: sub sp, #0x90 @ place for tweak[9]
#endif
vld1.8 {@XMM[8]}, [r0] @ initial tweak
adr $magic, .Lxts_magic
#ifndef XTS_CHAIN_TWEAK
tst $len, #0xf @ if not multiple of 16
it ne @ Thumb2 thing, sanity check in ARM
subne $len, #0x10 @ subtract another 16 bytes
#endif
subs $len, #0x80
blo .Lxts_dec_short
b .Lxts_dec_loop
.align 4
.Lxts_dec_loop:
vldmia $magic, {$twmask} @ load XTS magic
vshr.s64 @T[0], @XMM[8], #63
mov r0, sp
vand @T[0], @T[0], $twmask
___
for($i=9;$i<16;$i++) {
$code.=<<___;
vadd.u64 @XMM[$i], @XMM[$i-1], @XMM[$i-1]
vst1.64 {@XMM[$i-1]}, [r0,:128]!
vswp `&Dhi("@T[0]")`,`&Dlo("@T[0]")`
vshr.s64 @T[1], @XMM[$i], #63
veor @XMM[$i], @XMM[$i], @T[0]
vand @T[1], @T[1], $twmask
___
@T=reverse(@T);
$code.=<<___ if ($i>=10);
vld1.8 {@XMM[$i-10]}, [$inp]!
___
$code.=<<___ if ($i>=11);
veor @XMM[$i-11], @XMM[$i-11], @XMM[$i-3]
___
}
$code.=<<___;
vadd.u64 @XMM[8], @XMM[15], @XMM[15]
vst1.64 {@XMM[15]}, [r0,:128]!
vswp `&Dhi("@T[0]")`,`&Dlo("@T[0]")`
veor @XMM[8], @XMM[8], @T[0]
vst1.64 {@XMM[8]}, [r0,:128] @ next round tweak
vld1.8 {@XMM[6]-@XMM[7]}, [$inp]!
veor @XMM[5], @XMM[5], @XMM[13]
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, sp, #0x90 @ pass key schedule
#else
add r4, $key, #248 @ pass key schedule
#endif
veor @XMM[6], @XMM[6], @XMM[14]
mov r5, $rounds @ pass rounds
veor @XMM[7], @XMM[7], @XMM[15]
mov r0, sp
bl _bsaes_decrypt8
vld1.64 {@XMM[ 8]-@XMM[ 9]}, [r0,:128]!
vld1.64 {@XMM[10]-@XMM[11]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
vld1.64 {@XMM[12]-@XMM[13]}, [r0,:128]!
veor @XMM[1], @XMM[1], @XMM[ 9]
veor @XMM[8], @XMM[6], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]!
veor @XMM[9], @XMM[4], @XMM[11]
vld1.64 {@XMM[14]-@XMM[15]}, [r0,:128]!
veor @XMM[10], @XMM[2], @XMM[12]
vst1.8 {@XMM[8]-@XMM[9]}, [$out]!
veor @XMM[11], @XMM[7], @XMM[13]
veor @XMM[12], @XMM[3], @XMM[14]
vst1.8 {@XMM[10]-@XMM[11]}, [$out]!
veor @XMM[13], @XMM[5], @XMM[15]
vst1.8 {@XMM[12]-@XMM[13]}, [$out]!
vld1.64 {@XMM[8]}, [r0,:128] @ next round tweak
subs $len, #0x80
bpl .Lxts_dec_loop
.Lxts_dec_short:
adds $len, #0x70
bmi .Lxts_dec_done
vldmia $magic, {$twmask} @ load XTS magic
vshr.s64 @T[0], @XMM[8], #63
mov r0, sp
vand @T[0], @T[0], $twmask
___
for($i=9;$i<16;$i++) {
$code.=<<___;
vadd.u64 @XMM[$i], @XMM[$i-1], @XMM[$i-1]
vst1.64 {@XMM[$i-1]}, [r0,:128]!
vswp `&Dhi("@T[0]")`,`&Dlo("@T[0]")`
vshr.s64 @T[1], @XMM[$i], #63
veor @XMM[$i], @XMM[$i], @T[0]
vand @T[1], @T[1], $twmask
___
@T=reverse(@T);
$code.=<<___ if ($i>=10);
vld1.8 {@XMM[$i-10]}, [$inp]!
subs $len, #0x10
bmi .Lxts_dec_`$i-9`
___
$code.=<<___ if ($i>=11);
veor @XMM[$i-11], @XMM[$i-11], @XMM[$i-3]
___
}
$code.=<<___;
sub $len, #0x10
vst1.64 {@XMM[15]}, [r0,:128] @ next round tweak
vld1.8 {@XMM[6]}, [$inp]!
veor @XMM[5], @XMM[5], @XMM[13]
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, sp, #0x90 @ pass key schedule
#else
add r4, $key, #248 @ pass key schedule
#endif
veor @XMM[6], @XMM[6], @XMM[14]
mov r5, $rounds @ pass rounds
mov r0, sp
bl _bsaes_decrypt8
vld1.64 {@XMM[ 8]-@XMM[ 9]}, [r0,:128]!
vld1.64 {@XMM[10]-@XMM[11]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
vld1.64 {@XMM[12]-@XMM[13]}, [r0,:128]!
veor @XMM[1], @XMM[1], @XMM[ 9]
veor @XMM[8], @XMM[6], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]!
veor @XMM[9], @XMM[4], @XMM[11]
vld1.64 {@XMM[14]}, [r0,:128]!
veor @XMM[10], @XMM[2], @XMM[12]
vst1.8 {@XMM[8]-@XMM[9]}, [$out]!
veor @XMM[11], @XMM[7], @XMM[13]
veor @XMM[12], @XMM[3], @XMM[14]
vst1.8 {@XMM[10]-@XMM[11]}, [$out]!
vst1.8 {@XMM[12]}, [$out]!
vld1.64 {@XMM[8]}, [r0,:128] @ next round tweak
b .Lxts_dec_done
.align 4
.Lxts_dec_6:
vst1.64 {@XMM[14]}, [r0,:128] @ next round tweak
veor @XMM[4], @XMM[4], @XMM[12]
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, sp, #0x90 @ pass key schedule
#else
add r4, $key, #248 @ pass key schedule
#endif
veor @XMM[5], @XMM[5], @XMM[13]
mov r5, $rounds @ pass rounds
mov r0, sp
bl _bsaes_decrypt8
vld1.64 {@XMM[ 8]-@XMM[ 9]}, [r0,:128]!
vld1.64 {@XMM[10]-@XMM[11]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
vld1.64 {@XMM[12]-@XMM[13]}, [r0,:128]!
veor @XMM[1], @XMM[1], @XMM[ 9]
veor @XMM[8], @XMM[6], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]!
veor @XMM[9], @XMM[4], @XMM[11]
veor @XMM[10], @XMM[2], @XMM[12]
vst1.8 {@XMM[8]-@XMM[9]}, [$out]!
veor @XMM[11], @XMM[7], @XMM[13]
vst1.8 {@XMM[10]-@XMM[11]}, [$out]!
vld1.64 {@XMM[8]}, [r0,:128] @ next round tweak
b .Lxts_dec_done
.align 4
.Lxts_dec_5:
veor @XMM[3], @XMM[3], @XMM[11]
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, sp, #0x90 @ pass key schedule
#else
add r4, $key, #248 @ pass key schedule
#endif
veor @XMM[4], @XMM[4], @XMM[12]
mov r5, $rounds @ pass rounds
mov r0, sp
bl _bsaes_decrypt8
vld1.64 {@XMM[ 8]-@XMM[ 9]}, [r0,:128]!
vld1.64 {@XMM[10]-@XMM[11]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
vld1.64 {@XMM[12]}, [r0,:128]!
veor @XMM[1], @XMM[1], @XMM[ 9]
veor @XMM[8], @XMM[6], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]!
veor @XMM[9], @XMM[4], @XMM[11]
veor @XMM[10], @XMM[2], @XMM[12]
vst1.8 {@XMM[8]-@XMM[9]}, [$out]!
vst1.8 {@XMM[10]}, [$out]!
vld1.64 {@XMM[8]}, [r0,:128] @ next round tweak
b .Lxts_dec_done
.align 4
.Lxts_dec_4:
veor @XMM[2], @XMM[2], @XMM[10]
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, sp, #0x90 @ pass key schedule
#else
add r4, $key, #248 @ pass key schedule
#endif
veor @XMM[3], @XMM[3], @XMM[11]
mov r5, $rounds @ pass rounds
mov r0, sp
bl _bsaes_decrypt8
vld1.64 {@XMM[ 8]-@XMM[ 9]}, [r0,:128]!
vld1.64 {@XMM[10]-@XMM[11]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
veor @XMM[1], @XMM[1], @XMM[ 9]
veor @XMM[8], @XMM[6], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]!
veor @XMM[9], @XMM[4], @XMM[11]
vst1.8 {@XMM[8]-@XMM[9]}, [$out]!
vld1.64 {@XMM[8]}, [r0,:128] @ next round tweak
b .Lxts_dec_done
.align 4
.Lxts_dec_3:
veor @XMM[1], @XMM[1], @XMM[9]
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, sp, #0x90 @ pass key schedule
#else
add r4, $key, #248 @ pass key schedule
#endif
veor @XMM[2], @XMM[2], @XMM[10]
mov r5, $rounds @ pass rounds
mov r0, sp
bl _bsaes_decrypt8
vld1.64 {@XMM[8]-@XMM[9]}, [r0,:128]!
vld1.64 {@XMM[10]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
veor @XMM[1], @XMM[1], @XMM[ 9]
veor @XMM[8], @XMM[6], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]!
vst1.8 {@XMM[8]}, [$out]!
vld1.64 {@XMM[8]}, [r0,:128] @ next round tweak
b .Lxts_dec_done
.align 4
.Lxts_dec_2:
veor @XMM[0], @XMM[0], @XMM[8]
#ifndef BSAES_ASM_EXTENDED_KEY
add r4, sp, #0x90 @ pass key schedule
#else
add r4, $key, #248 @ pass key schedule
#endif
veor @XMM[1], @XMM[1], @XMM[9]
mov r5, $rounds @ pass rounds
mov r0, sp
bl _bsaes_decrypt8
vld1.64 {@XMM[8]-@XMM[9]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
veor @XMM[1], @XMM[1], @XMM[ 9]
vst1.8 {@XMM[0]-@XMM[1]}, [$out]!
vld1.64 {@XMM[8]}, [r0,:128] @ next round tweak
b .Lxts_dec_done
.align 4
.Lxts_dec_1:
mov r0, sp
veor @XMM[0], @XMM[0], @XMM[8]
mov r1, sp
vst1.8 {@XMM[0]}, [sp,:128]
mov r5, $magic @ preserve magic
mov r2, $key
mov r4, $fp @ preserve fp
bl AES_decrypt
vld1.8 {@XMM[0]}, [sp,:128]
veor @XMM[0], @XMM[0], @XMM[8]
vst1.8 {@XMM[0]}, [$out]!
mov $fp, r4
mov $magic, r5
vmov @XMM[8], @XMM[9] @ next round tweak
.Lxts_dec_done:
#ifndef XTS_CHAIN_TWEAK
adds $len, #0x10
beq .Lxts_dec_ret
@ calculate one round of extra tweak for the stolen ciphertext
vldmia $magic, {$twmask}
vshr.s64 @XMM[6], @XMM[8], #63
vand @XMM[6], @XMM[6], $twmask
vadd.u64 @XMM[9], @XMM[8], @XMM[8]
vswp `&Dhi("@XMM[6]")`,`&Dlo("@XMM[6]")`
veor @XMM[9], @XMM[9], @XMM[6]
@ perform the final decryption with the last tweak value
vld1.8 {@XMM[0]}, [$inp]!
mov r0, sp
veor @XMM[0], @XMM[0], @XMM[9]
mov r1, sp
vst1.8 {@XMM[0]}, [sp,:128]
mov r2, $key
mov r4, $fp @ preserve fp
bl AES_decrypt
vld1.8 {@XMM[0]}, [sp,:128]
veor @XMM[0], @XMM[0], @XMM[9]
vst1.8 {@XMM[0]}, [$out]
mov r6, $out
.Lxts_dec_steal:
ldrb r1, [$out]
ldrb r0, [$inp], #1
strb r1, [$out, #0x10]
strb r0, [$out], #1
subs $len, #1
bhi .Lxts_dec_steal
vld1.8 {@XMM[0]}, [r6]
mov r0, sp
veor @XMM[0], @XMM[8]
mov r1, sp
vst1.8 {@XMM[0]}, [sp,:128]
mov r2, $key
bl AES_decrypt
vld1.8 {@XMM[0]}, [sp,:128]
veor @XMM[0], @XMM[0], @XMM[8]
vst1.8 {@XMM[0]}, [r6]
mov $fp, r4
#endif
.Lxts_dec_ret:
bic r0, $fp, #0xf
vmov.i32 q0, #0
vmov.i32 q1, #0
#ifdef XTS_CHAIN_TWEAK
ldr r1, [$fp, #0x20+VFP_ABI_FRAME] @ chain tweak
#endif
.Lxts_dec_bzero: @ wipe key schedule [if any]
vstmia sp!, {q0-q1}
cmp sp, r0
bne .Lxts_dec_bzero
mov sp, $fp
#ifdef XTS_CHAIN_TWEAK
vst1.8 {@XMM[8]}, [r1]
#endif
VFP_ABI_POP
ldmia sp!, {r4-r10, pc} @ return
.size bsaes_xts_decrypt,.-bsaes_xts_decrypt
___
}
$code.=<<___;
#endif
___
$code =~ s/\`([^\`]*)\`/eval($1)/gem;
open SELF,$0;
while(<SELF>) {
next if (/^#!/);
last if (!s/^#/@/ and !/^$/);
print;
}
close SELF;
print $code;
close STDOUT;
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