244 lines
5.6 KiB
Perl
244 lines
5.6 KiB
Perl
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#!/usr/bin/env perl
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# SPDX-License-Identifier: GPL-2.0
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# This code is taken from the OpenSSL project but the author (Andy Polyakov)
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# has relicensed it under the GPLv2. Therefore this program is free software;
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# you can redistribute it and/or modify it under the terms of the GNU General
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# Public License version 2 as published by the Free Software Foundation.
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#
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# The original headers, including the original license headers, are
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# included below for completeness.
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# ====================================================================
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# Written by Andy Polyakov <appro@openssl.org> for the OpenSSL
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# project. The module is, however, dual licensed under OpenSSL and
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# CRYPTOGAMS licenses depending on where you obtain it. For further
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# details see https://www.openssl.org/~appro/cryptogams/.
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# ====================================================================
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#
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# GHASH for PowerISA v2.07.
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#
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# July 2014
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#
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# Accurate performance measurements are problematic, because it's
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# always virtualized setup with possibly throttled processor.
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# Relative comparison is therefore more informative. This initial
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# version is ~2.1x slower than hardware-assisted AES-128-CTR, ~12x
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# faster than "4-bit" integer-only compiler-generated 64-bit code.
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# "Initial version" means that there is room for futher improvement.
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$flavour=shift;
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$output =shift;
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if ($flavour =~ /64/) {
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$SIZE_T=8;
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$LRSAVE=2*$SIZE_T;
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$STU="stdu";
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$POP="ld";
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$PUSH="std";
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} elsif ($flavour =~ /32/) {
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$SIZE_T=4;
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$LRSAVE=$SIZE_T;
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$STU="stwu";
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$POP="lwz";
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$PUSH="stw";
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} else { die "nonsense $flavour"; }
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$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
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( $xlate="${dir}ppc-xlate.pl" and -f $xlate ) or
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( $xlate="${dir}../../perlasm/ppc-xlate.pl" and -f $xlate) or
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die "can't locate ppc-xlate.pl";
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open STDOUT,"| $^X $xlate $flavour $output" || die "can't call $xlate: $!";
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my ($Xip,$Htbl,$inp,$len)=map("r$_",(3..6)); # argument block
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my ($Xl,$Xm,$Xh,$IN)=map("v$_",(0..3));
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my ($zero,$t0,$t1,$t2,$xC2,$H,$Hh,$Hl,$lemask)=map("v$_",(4..12));
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my $vrsave="r12";
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$code=<<___;
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.machine "any"
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.text
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.globl .gcm_init_p8
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lis r0,0xfff0
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li r8,0x10
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mfspr $vrsave,256
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li r9,0x20
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mtspr 256,r0
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li r10,0x30
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lvx_u $H,0,r4 # load H
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le?xor r7,r7,r7
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le?addi r7,r7,0x8 # need a vperm start with 08
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le?lvsr 5,0,r7
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le?vspltisb 6,0x0f
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le?vxor 5,5,6 # set a b-endian mask
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le?vperm $H,$H,$H,5
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vspltisb $xC2,-16 # 0xf0
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vspltisb $t0,1 # one
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vaddubm $xC2,$xC2,$xC2 # 0xe0
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vxor $zero,$zero,$zero
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vor $xC2,$xC2,$t0 # 0xe1
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vsldoi $xC2,$xC2,$zero,15 # 0xe1...
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vsldoi $t1,$zero,$t0,1 # ...1
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vaddubm $xC2,$xC2,$xC2 # 0xc2...
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vspltisb $t2,7
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vor $xC2,$xC2,$t1 # 0xc2....01
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vspltb $t1,$H,0 # most significant byte
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vsl $H,$H,$t0 # H<<=1
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vsrab $t1,$t1,$t2 # broadcast carry bit
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vand $t1,$t1,$xC2
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vxor $H,$H,$t1 # twisted H
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vsldoi $H,$H,$H,8 # twist even more ...
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vsldoi $xC2,$zero,$xC2,8 # 0xc2.0
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vsldoi $Hl,$zero,$H,8 # ... and split
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vsldoi $Hh,$H,$zero,8
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stvx_u $xC2,0,r3 # save pre-computed table
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stvx_u $Hl,r8,r3
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stvx_u $H, r9,r3
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stvx_u $Hh,r10,r3
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mtspr 256,$vrsave
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blr
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.long 0
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.byte 0,12,0x14,0,0,0,2,0
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.long 0
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.size .gcm_init_p8,.-.gcm_init_p8
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.globl .gcm_gmult_p8
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lis r0,0xfff8
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li r8,0x10
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mfspr $vrsave,256
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li r9,0x20
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mtspr 256,r0
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li r10,0x30
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lvx_u $IN,0,$Xip # load Xi
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lvx_u $Hl,r8,$Htbl # load pre-computed table
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le?lvsl $lemask,r0,r0
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lvx_u $H, r9,$Htbl
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le?vspltisb $t0,0x07
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lvx_u $Hh,r10,$Htbl
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le?vxor $lemask,$lemask,$t0
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lvx_u $xC2,0,$Htbl
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le?vperm $IN,$IN,$IN,$lemask
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vxor $zero,$zero,$zero
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vpmsumd $Xl,$IN,$Hl # H.lo·Xi.lo
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vpmsumd $Xm,$IN,$H # H.hi·Xi.lo+H.lo·Xi.hi
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vpmsumd $Xh,$IN,$Hh # H.hi·Xi.hi
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vpmsumd $t2,$Xl,$xC2 # 1st phase
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vsldoi $t0,$Xm,$zero,8
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vsldoi $t1,$zero,$Xm,8
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vxor $Xl,$Xl,$t0
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vxor $Xh,$Xh,$t1
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vsldoi $Xl,$Xl,$Xl,8
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vxor $Xl,$Xl,$t2
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vsldoi $t1,$Xl,$Xl,8 # 2nd phase
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vpmsumd $Xl,$Xl,$xC2
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vxor $t1,$t1,$Xh
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vxor $Xl,$Xl,$t1
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le?vperm $Xl,$Xl,$Xl,$lemask
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stvx_u $Xl,0,$Xip # write out Xi
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mtspr 256,$vrsave
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blr
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.long 0
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.byte 0,12,0x14,0,0,0,2,0
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.long 0
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.size .gcm_gmult_p8,.-.gcm_gmult_p8
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.globl .gcm_ghash_p8
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lis r0,0xfff8
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li r8,0x10
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mfspr $vrsave,256
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li r9,0x20
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mtspr 256,r0
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li r10,0x30
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lvx_u $Xl,0,$Xip # load Xi
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lvx_u $Hl,r8,$Htbl # load pre-computed table
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le?lvsl $lemask,r0,r0
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lvx_u $H, r9,$Htbl
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le?vspltisb $t0,0x07
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lvx_u $Hh,r10,$Htbl
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le?vxor $lemask,$lemask,$t0
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lvx_u $xC2,0,$Htbl
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le?vperm $Xl,$Xl,$Xl,$lemask
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vxor $zero,$zero,$zero
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lvx_u $IN,0,$inp
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addi $inp,$inp,16
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subi $len,$len,16
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le?vperm $IN,$IN,$IN,$lemask
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vxor $IN,$IN,$Xl
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b Loop
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.align 5
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Loop:
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subic $len,$len,16
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vpmsumd $Xl,$IN,$Hl # H.lo·Xi.lo
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subfe. r0,r0,r0 # borrow?-1:0
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vpmsumd $Xm,$IN,$H # H.hi·Xi.lo+H.lo·Xi.hi
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and r0,r0,$len
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vpmsumd $Xh,$IN,$Hh # H.hi·Xi.hi
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add $inp,$inp,r0
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vpmsumd $t2,$Xl,$xC2 # 1st phase
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vsldoi $t0,$Xm,$zero,8
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vsldoi $t1,$zero,$Xm,8
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vxor $Xl,$Xl,$t0
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vxor $Xh,$Xh,$t1
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vsldoi $Xl,$Xl,$Xl,8
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vxor $Xl,$Xl,$t2
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lvx_u $IN,0,$inp
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addi $inp,$inp,16
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vsldoi $t1,$Xl,$Xl,8 # 2nd phase
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vpmsumd $Xl,$Xl,$xC2
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le?vperm $IN,$IN,$IN,$lemask
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vxor $t1,$t1,$Xh
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vxor $IN,$IN,$t1
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vxor $IN,$IN,$Xl
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beq Loop # did $len-=16 borrow?
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vxor $Xl,$Xl,$t1
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le?vperm $Xl,$Xl,$Xl,$lemask
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stvx_u $Xl,0,$Xip # write out Xi
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mtspr 256,$vrsave
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blr
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.long 0
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.byte 0,12,0x14,0,0,0,4,0
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.long 0
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.size .gcm_ghash_p8,.-.gcm_ghash_p8
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.asciz "GHASH for PowerISA 2.07, CRYPTOGAMS by <appro\@openssl.org>"
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.align 2
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___
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foreach (split("\n",$code)) {
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if ($flavour =~ /le$/o) { # little-endian
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s/le\?//o or
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s/be\?/#be#/o;
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} else {
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s/le\?/#le#/o or
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s/be\?//o;
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}
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print $_,"\n";
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}
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close STDOUT; # enforce flush
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