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| #! /usr/bin/env perl
| # Copyright 2016-2020 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 or die "error closing STDOUT: $!";
|
|
