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linux/arch/arm/crypto/bsaes-armv7.pl
Ard Biesheuvel e4e7f10bfc ARM: add support for bit sliced AES using NEON instructions 
Bit sliced AES gives around 45% speedup on Cortex-A15 for encryption
and around 25% for decryption. This implementation of the AES algorithm
does not rely on any lookup tables so it is believed to be invulnerable
to cache timing attacks.

This algorithm processes up to 8 blocks in parallel in constant time. This
means that it is not usable by chaining modes that are strictly sequential
in nature, such as CBC encryption. CBC decryption, however, can benefit from
this implementation and runs about 25% faster. The other chaining modes
implemented in this module, XTS and CTR, can execute fully in parallel in
both directions.

The core code has been adopted from the OpenSSL project (in collaboration
with the original author, on cc). For ease of maintenance, this version is
identical to the upstream OpenSSL code, i.e., all modifications that were
required to make it suitable for inclusion into the kernel have been made
upstream. The original can be found here:

    http://git.openssl.org/gitweb/?p=openssl.git;a=commit;h=6f6a6130

Note to integrators:
While this implementation is significantly faster than the existing table
based ones (generic or ARM asm), especially in CTR mode, the effects on
power efficiency are unclear as of yet. This code does fundamentally more
work, by calculating values that the table based code obtains by a simple
lookup; only by doing all of that work in a SIMD fashion, it manages to
perform better.

Cc: Andy Polyakov <appro@openssl.org>
Acked-by: Nicolas Pitre <nico@linaro.org>
Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>
2013-10-04 20:48:38 +02:00

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#!/usr/bin/env perl
# ====================================================================
# 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
# <ard.biesheuvel@linaro.org>. 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, adapt for kernel use.
#
# <ard.biesheuvel@linaro.org>
while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
open STDOUT,">$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 "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__
#endif
#ifdef __thumb__
# define adrl adr
#endif
#if __ARM_ARCH__>=7
.text
.syntax unified @ ARMv7-capable assembler is expected to handle this
#ifdef __thumb2__
.thumb
#else
.code 32
#endif
.fpu neon
.type _bsaes_decrypt8,%function
.align 4
_bsaes_decrypt8:
adr $const,_bsaes_decrypt8
vldmia $key!, {@XMM[9]} @ round 0 key
add $const,$const,#.LM0ISR-_bsaes_decrypt8
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,_bsaes_encrypt8
vldmia $key!, {@XMM[9]} @ round 0 key
sub $const,$const,#_bsaes_encrypt8-.LM0SR
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 $const,_bsaes_key_convert
vld1.8 {@XMM[7]}, [$inp]! @ load round 0 key
sub $const,$const,#_bsaes_key_convert-.LM0
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,:64] @ 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
add $ctr, $const, #.LREVM0SR-.LM0 @ borrow $ctr
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
sub $const, $ctr, #.LREVM0SR-.LSR @ pass constants
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, $key
ldr r8, [ip, #12] @ load counter LSW
vld1.8 {@XMM[1]}, [ip] @ load whole counter value
#ifdef __ARMEL__
rev r8, r8
#endif
sub sp, sp, #0x10
vst1.8 {@XMM[1]}, [sp,:64] @ copy counter value
sub sp, sp, #0x10
.Lctr_enc_short_loop:
add r0, sp, #0x10 @ input counter value
mov r1, sp @ output on the stack
mov r2, r7 @ key
bl AES_encrypt
vld1.8 {@XMM[0]}, [r4]! @ load input
vld1.8 {@XMM[1]}, [sp,:64] @ load encrypted counter
add r8, r8, #1
#ifdef __ARMEL__
rev r0, r8
str r0, [sp, #0x1c] @ next counter value
#else
str r8, [sp, #0x1c] @ next counter value
#endif
veor @XMM[0],@XMM[0],@XMM[1]
vst1.8 {@XMM[0]}, [r5]! @ store output
subs r6, r6, #1
bne .Lctr_enc_short_loop
vmov.i32 q0, #0
vmov.i32 q1, #0
vstmia sp!, {q0-q1}
ldmia sp!, {r4-r8, pc}
.size bsaes_ctr32_encrypt_blocks,.-bsaes_ctr32_encrypt_blocks
___
}
{
######################################################################
# void bsaes_xts_[en|de]crypt(const char *inp,char *out,size_t len,
# const AES_KEY *key1, const AES_KEY *key2,
# const unsigned char iv[16]);
#
my ($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:
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, $rounds @ pass rounds
mov r0, sp
bl _bsaes_encrypt8
vld1.64 {@XMM[ 8]-@XMM[ 9]}, [r0,:128]!
vld1.64 {@XMM[10]-@XMM[11]}, [r0,:128]!
veor @XMM[0], @XMM[0], @XMM[ 8]
vld1.64 {@XMM[12]-@XMM[13]}, [r0,:128]!
veor @XMM[1], @XMM[1], @XMM[ 9]
veor @XMM[8], @XMM[4], @XMM[10]
vst1.8 {@XMM[0]-@XMM[1]}, [$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:
vst1.64 {@XMM[13]}, [r0,:128] @ next round tweak
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:
vst1.64 {@XMM[12]}, [r0,:128] @ next round tweak
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:
vst1.64 {@XMM[11]}, [r0,:128] @ next round tweak
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:
vst1.64 {@XMM[10]}, [r0,:128] @ next round tweak
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[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
tst $len, #0xf @ if not multiple of 16
it ne @ Thumb2 thing, sanity check in ARM
subne $len, #0x10 @ subtract another 16 bytes
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:
vst1.64 {@XMM[13]}, [r0,:128] @ next round tweak
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:
vst1.64 {@XMM[12]}, [r0,:128] @ next round tweak
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:
vst1.64 {@XMM[11]}, [r0,:128] @ next round tweak
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:
vst1.64 {@XMM[10]}, [r0,:128] @ next round tweak
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[8]
mov r1, sp
vst1.8 {@XMM[0]}, [sp,:128]
mov r2, $key
mov r4, $fp @ preserve fp
mov r5, $magic @ preserve magic
bl AES_decrypt
vld1.8 {@XMM[0]}, [sp,:128]
veor @XMM[0], @XMM[0], @XMM[8]
vst1.8 {@XMM[0]}, [$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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