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#! /usr/bin/env perl
# Copyright 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/.
# ====================================================================
#
# This module implements Poly1305 hash for s390x.
#
# June 2015
#
# ~6.6/2.3 cpb on z10/z196+, >2x improvement over compiler-generated
# code. For older compiler improvement coefficient is >3x, because
# then base 2^64 and base 2^32 implementations are compared.
#
# On side note, z13 enables vector base 2^26 implementation...
$flavour = shift;
if ($flavour =~ /3[12]/) {
$SIZE_T=4;
$g="";
} else {
$SIZE_T=8;
$g="g";
}
while (($output=shift) && ($output!~/\w[\w\-]*\.\w+$/)) {}
open STDOUT,">$output";
$sp="%r15";
my ($ctx,$inp,$len,$padbit) = map("%r$_",(2..5));
$code.=<<___;
.text
.globl poly1305_init
.type poly1305_init,\@function
.align 16
poly1305_init:
lghi %r0,0
lghi %r1,-1
stg %r0,0($ctx) # zero hash value
stg %r0,8($ctx)
stg %r0,16($ctx)
cl${g}r $inp,%r0
je .Lno_key
lrvg %r4,0($inp) # load little-endian key
lrvg %r5,8($inp)
nihl %r1,0xffc0 # 0xffffffc0ffffffff
srlg %r0,%r1,4 # 0x0ffffffc0fffffff
srlg %r1,%r1,4
nill %r1,0xfffc # 0x0ffffffc0ffffffc
ngr %r4,%r0
ngr %r5,%r1
stg %r4,32($ctx)
stg %r5,40($ctx)
.Lno_key:
lghi %r2,0
br %r14
.size poly1305_init,.-poly1305_init
___
{
my ($d0hi,$d0lo,$d1hi,$d1lo,$t0,$h0,$t1,$h1,$h2) = map("%r$_",(6..14));
my ($r0,$r1,$s1) = map("%r$_",(0..2));
$code.=<<___;
.globl poly1305_blocks
.type poly1305_blocks,\@function
.align 16
poly1305_blocks:
srl${g} $len,4 # fixed-up in 64-bit build
lghi %r0,0
cl${g}r $len,%r0
je .Lno_data
stm${g} %r6,%r14,`6*$SIZE_T`($sp)
llgfr $padbit,$padbit # clear upper half, much needed with
# non-64-bit ABI
lg $r0,32($ctx) # load key
lg $r1,40($ctx)
lg $h0,0($ctx) # load hash value
lg $h1,8($ctx)
lg $h2,16($ctx)
st$g $ctx,`2*$SIZE_T`($sp) # off-load $ctx
srlg $s1,$r1,2
algr $s1,$r1 # s1 = r1 + r1>>2
j .Loop
.align 16
.Loop:
lrvg $d0lo,0($inp) # load little-endian input
lrvg $d1lo,8($inp)
la $inp,16($inp)
algr $d0lo,$h0 # accumulate input
alcgr $d1lo,$h1
lgr $h0,$d0lo
mlgr $d0hi,$r0 # h0*r0 -> $d0hi:$d0lo
lgr $h1,$d1lo
mlgr $d1hi,$s1 # h1*5*r1 -> $d1hi:$d1lo
mlgr $t0,$r1 # h0*r1 -> $t0:$h0
mlgr $t1,$r0 # h1*r0 -> $t1:$h1
alcgr $h2,$padbit
algr $d0lo,$d1lo
lgr $d1lo,$h2
alcgr $d0hi,$d1hi
lghi $d1hi,0
algr $h1,$h0
alcgr $t1,$t0
msgr $d1lo,$s1 # h2*s1
msgr $h2,$r0 # h2*r0
algr $h1,$d1lo
alcgr $t1,$d1hi # $d1hi is zero
algr $h1,$d0hi
alcgr $h2,$t1
lghi $h0,-4 # final reduction step
ngr $h0,$h2
srlg $t0,$h2,2
algr $h0,$t0
lghi $t1,3
ngr $h2,$t1
algr $h0,$d0lo
alcgr $h1,$d1hi # $d1hi is still zero
alcgr $h2,$d1hi # $d1hi is still zero
brct$g $len,.Loop
l$g $ctx,`2*$SIZE_T`($sp) # restore $ctx
stg $h0,0($ctx) # store hash value
stg $h1,8($ctx)
stg $h2,16($ctx)
lm${g} %r6,%r14,`6*$SIZE_T`($sp)
.Lno_data:
br %r14
.size poly1305_blocks,.-poly1305_blocks
___
}
{
my ($mac,$nonce)=($inp,$len);
my ($h0,$h1,$h2,$d0,$d1)=map("%r$_",(5..9));
$code.=<<___;
.globl poly1305_emit
.type poly1305_emit,\@function
.align 16
poly1305_emit:
stm${g} %r6,%r9,`6*$SIZE_T`($sp)
lg $h0,0($ctx)
lg $h1,8($ctx)
lg $h2,16($ctx)
lghi %r0,5
lghi %r1,0
lgr $d0,$h0
lgr $d1,$h1
algr $h0,%r0 # compare to modulus
alcgr $h1,%r1
alcgr $h2,%r1
srlg $h2,$h2,2 # did it borrow/carry?
slgr %r1,$h2 # 0-$h2>>2
lg $h2,0($nonce) # load nonce
lghi %r0,-1
lg $ctx,8($nonce)
xgr %r0,%r1 # ~%r1
ngr $h0,%r1
ngr $d0,%r0
ngr $h1,%r1
ngr $d1,%r0
ogr $h0,$d0
rllg $d0,$h2,32 # flip nonce words
ogr $h1,$d1
rllg $d1,$ctx,32
algr $h0,$d0 # accumulate nonce
alcgr $h1,$d1
strvg $h0,0($mac) # write little-endian result
strvg $h1,8($mac)
lm${g} %r6,%r9,`6*$SIZE_T`($sp)
br %r14
.size poly1305_emit,.-poly1305_emit
.string "Poly1305 for s390x, CRYPTOGAMS by <appro\@openssl.org>"
___
}
$code =~ s/\`([^\`]*)\`/eval $1/gem;
$code =~ s/\b(srlg\s+)(%r[0-9]+\s*,)\s*([0-9]+)/$1$2$2$3/gm;
print $code;
close STDOUT;
|
