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crypto: p10-aes-gcm - Supporting functions for ghash
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This perl code is taken from the OpenSSL project and added gcm_init_htable function
used in the aes-gcm-p10-glue.c code to initialize hash table.  gcm_hash_p8 is used
to hash encrypted data blocks.

Signed-off-by: Danny Tsen <dtsen@linux.ibm.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
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Danny Tsen authored and Herbert Xu committed Mar 14, 2023
1 parent 34ce627 commit 55d762d
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370 changes: 370 additions & 0 deletions arch/powerpc/crypto/ghashp8-ppc.pl
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#!/usr/bin/env perl
# SPDX-License-Identifier: GPL-2.0

# This code is taken from the OpenSSL project but the author (Andy Polyakov)
# has relicensed it under the GPLv2. Therefore this program is free software;
# you can redistribute it and/or modify it under the terms of the GNU General
# Public License version 2 as published by the Free Software Foundation.
#
# The original headers, including the original license headers, are
# included below for completeness.

# ====================================================================
# 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 https://www.openssl.org/~appro/cryptogams/.
# ====================================================================
#
# GHASH for PowerISA v2.07.
#
# July 2014
#
# Accurate performance measurements are problematic, because it's
# always virtualized setup with possibly throttled processor.
# Relative comparison is therefore more informative. This initial
# version is ~2.1x slower than hardware-assisted AES-128-CTR, ~12x
# faster than "4-bit" integer-only compiler-generated 64-bit code.
# "Initial version" means that there is room for futher improvement.

$flavour=shift;
$output =shift;

if ($flavour =~ /64/) {
$SIZE_T=8;
$LRSAVE=2*$SIZE_T;
$STU="stdu";
$POP="ld";
$PUSH="std";
} elsif ($flavour =~ /32/) {
$SIZE_T=4;
$LRSAVE=$SIZE_T;
$STU="stwu";
$POP="lwz";
$PUSH="stw";
} else { die "nonsense $flavour"; }

$0 =~ m/(.*[\/\\])[^\/\\]+$/; $dir=$1;
( $xlate="${dir}ppc-xlate.pl" and -f $xlate ) or
( $xlate="${dir}../../perlasm/ppc-xlate.pl" and -f $xlate) or
die "can't locate ppc-xlate.pl";

open STDOUT,"| $^X $xlate $flavour $output" || die "can't call $xlate: $!";

my ($Xip,$Htbl,$inp,$len)=map("r$_",(3..6)); # argument block

my ($Xl,$Xm,$Xh,$IN)=map("v$_",(0..3));
my ($zero,$t0,$t1,$t2,$xC2,$H,$Hh,$Hl,$lemask)=map("v$_",(4..12));
my ($Xl1,$Xm1,$Xh1,$IN1,$H2,$H2h,$H2l)=map("v$_",(13..19));
my $vrsave="r12";
my ($t4,$t5,$t6) = ($Hl,$H,$Hh);

$code=<<___;
.machine "any"
.text
.globl .gcm_init_p8
lis r0,0xfff0
li r8,0x10
mfspr $vrsave,256
li r9,0x20
mtspr 256,r0
li r10,0x30
lvx_u $H,0,r4 # load H
le?xor r7,r7,r7
le?addi r7,r7,0x8 # need a vperm start with 08
le?lvsr 5,0,r7
le?vspltisb 6,0x0f
le?vxor 5,5,6 # set a b-endian mask
le?vperm $H,$H,$H,5
vspltisb $xC2,-16 # 0xf0
vspltisb $t0,1 # one
vaddubm $xC2,$xC2,$xC2 # 0xe0
vxor $zero,$zero,$zero
vor $xC2,$xC2,$t0 # 0xe1
vsldoi $xC2,$xC2,$zero,15 # 0xe1...
vsldoi $t1,$zero,$t0,1 # ...1
vaddubm $xC2,$xC2,$xC2 # 0xc2...
vspltisb $t2,7
vor $xC2,$xC2,$t1 # 0xc2....01
vspltb $t1,$H,0 # most significant byte
vsl $H,$H,$t0 # H<<=1
vsrab $t1,$t1,$t2 # broadcast carry bit
vand $t1,$t1,$xC2
vxor $H,$H,$t1 # twisted H
vsldoi $H,$H,$H,8 # twist even more ...
vsldoi $xC2,$zero,$xC2,8 # 0xc2.0
vsldoi $Hl,$zero,$H,8 # ... and split
vsldoi $Hh,$H,$zero,8
stvx_u $xC2,0,r3 # save pre-computed table
stvx_u $Hl,r8,r3
stvx_u $H, r9,r3
stvx_u $Hh,r10,r3
mtspr 256,$vrsave
blr
.long 0
.byte 0,12,0x14,0,0,0,2,0
.long 0
.size .gcm_init_p8,.-.gcm_init_p8
.globl .gcm_init_htable
lis r0,0xfff0
li r8,0x10
mfspr $vrsave,256
li r9,0x20
mtspr 256,r0
li r10,0x30
lvx_u $H,0,r4 # load H
vspltisb $xC2,-16 # 0xf0
vspltisb $t0,1 # one
vaddubm $xC2,$xC2,$xC2 # 0xe0
vxor $zero,$zero,$zero
vor $xC2,$xC2,$t0 # 0xe1
vsldoi $xC2,$xC2,$zero,15 # 0xe1...
vsldoi $t1,$zero,$t0,1 # ...1
vaddubm $xC2,$xC2,$xC2 # 0xc2...
vspltisb $t2,7
vor $xC2,$xC2,$t1 # 0xc2....01
vspltb $t1,$H,0 # most significant byte
vsl $H,$H,$t0 # H<<=1
vsrab $t1,$t1,$t2 # broadcast carry bit
vand $t1,$t1,$xC2
vxor $IN,$H,$t1 # twisted H
vsldoi $H,$IN,$IN,8 # twist even more ...
vsldoi $xC2,$zero,$xC2,8 # 0xc2.0
vsldoi $Hl,$zero,$H,8 # ... and split
vsldoi $Hh,$H,$zero,8
stvx_u $xC2,0,r3 # save pre-computed table
stvx_u $Hl,r8,r3
li r8,0x40
stvx_u $H, r9,r3
li r9,0x50
stvx_u $Hh,r10,r3
li r10,0x60
vpmsumd $Xl,$IN,$Hl # H.lo·H.lo
vpmsumd $Xm,$IN,$H # H.hi·H.lo+H.lo·H.hi
vpmsumd $Xh,$IN,$Hh # H.hi·H.hi
vpmsumd $t2,$Xl,$xC2 # 1st reduction phase
vsldoi $t0,$Xm,$zero,8
vsldoi $t1,$zero,$Xm,8
vxor $Xl,$Xl,$t0
vxor $Xh,$Xh,$t1
vsldoi $Xl,$Xl,$Xl,8
vxor $Xl,$Xl,$t2
vsldoi $t1,$Xl,$Xl,8 # 2nd reduction phase
vpmsumd $Xl,$Xl,$xC2
vxor $t1,$t1,$Xh
vxor $IN1,$Xl,$t1
vsldoi $H2,$IN1,$IN1,8
vsldoi $H2l,$zero,$H2,8
vsldoi $H2h,$H2,$zero,8
stvx_u $H2l,r8,r3 # save H^2
li r8,0x70
stvx_u $H2,r9,r3
li r9,0x80
stvx_u $H2h,r10,r3
li r10,0x90
vpmsumd $Xl,$IN,$H2l # H.lo·H^2.lo
vpmsumd $Xl1,$IN1,$H2l # H^2.lo·H^2.lo
vpmsumd $Xm,$IN,$H2 # H.hi·H^2.lo+H.lo·H^2.hi
vpmsumd $Xm1,$IN1,$H2 # H^2.hi·H^2.lo+H^2.lo·H^2.hi
vpmsumd $Xh,$IN,$H2h # H.hi·H^2.hi
vpmsumd $Xh1,$IN1,$H2h # H^2.hi·H^2.hi
vpmsumd $t2,$Xl,$xC2 # 1st reduction phase
vpmsumd $t6,$Xl1,$xC2 # 1st reduction phase
vsldoi $t0,$Xm,$zero,8
vsldoi $t1,$zero,$Xm,8
vsldoi $t4,$Xm1,$zero,8
vsldoi $t5,$zero,$Xm1,8
vxor $Xl,$Xl,$t0
vxor $Xh,$Xh,$t1
vxor $Xl1,$Xl1,$t4
vxor $Xh1,$Xh1,$t5
vsldoi $Xl,$Xl,$Xl,8
vsldoi $Xl1,$Xl1,$Xl1,8
vxor $Xl,$Xl,$t2
vxor $Xl1,$Xl1,$t6
vsldoi $t1,$Xl,$Xl,8 # 2nd reduction phase
vsldoi $t5,$Xl1,$Xl1,8 # 2nd reduction phase
vpmsumd $Xl,$Xl,$xC2
vpmsumd $Xl1,$Xl1,$xC2
vxor $t1,$t1,$Xh
vxor $t5,$t5,$Xh1
vxor $Xl,$Xl,$t1
vxor $Xl1,$Xl1,$t5
vsldoi $H,$Xl,$Xl,8
vsldoi $H2,$Xl1,$Xl1,8
vsldoi $Hl,$zero,$H,8
vsldoi $Hh,$H,$zero,8
vsldoi $H2l,$zero,$H2,8
vsldoi $H2h,$H2,$zero,8
stvx_u $Hl,r8,r3 # save H^3
li r8,0xa0
stvx_u $H,r9,r3
li r9,0xb0
stvx_u $Hh,r10,r3
li r10,0xc0
stvx_u $H2l,r8,r3 # save H^4
stvx_u $H2,r9,r3
stvx_u $H2h,r10,r3
mtspr 256,$vrsave
blr
.long 0
.byte 0,12,0x14,0,0,0,2,0
.long 0
.size .gcm_init_htable,.-.gcm_init_htable
.globl .gcm_gmult_p8
lis r0,0xfff8
li r8,0x10
mfspr $vrsave,256
li r9,0x20
mtspr 256,r0
li r10,0x30
lvx_u $IN,0,$Xip # load Xi
lvx_u $Hl,r8,$Htbl # load pre-computed table
le?lvsl $lemask,r0,r0
lvx_u $H, r9,$Htbl
le?vspltisb $t0,0x07
lvx_u $Hh,r10,$Htbl
le?vxor $lemask,$lemask,$t0
lvx_u $xC2,0,$Htbl
le?vperm $IN,$IN,$IN,$lemask
vxor $zero,$zero,$zero
vpmsumd $Xl,$IN,$Hl # H.lo·Xi.lo
vpmsumd $Xm,$IN,$H # H.hi·Xi.lo+H.lo·Xi.hi
vpmsumd $Xh,$IN,$Hh # H.hi·Xi.hi
vpmsumd $t2,$Xl,$xC2 # 1st phase
vsldoi $t0,$Xm,$zero,8
vsldoi $t1,$zero,$Xm,8
vxor $Xl,$Xl,$t0
vxor $Xh,$Xh,$t1
vsldoi $Xl,$Xl,$Xl,8
vxor $Xl,$Xl,$t2
vsldoi $t1,$Xl,$Xl,8 # 2nd phase
vpmsumd $Xl,$Xl,$xC2
vxor $t1,$t1,$Xh
vxor $Xl,$Xl,$t1
le?vperm $Xl,$Xl,$Xl,$lemask
stvx_u $Xl,0,$Xip # write out Xi
mtspr 256,$vrsave
blr
.long 0
.byte 0,12,0x14,0,0,0,2,0
.long 0
.size .gcm_gmult_p8,.-.gcm_gmult_p8
.globl .gcm_ghash_p8
lis r0,0xfff8
li r8,0x10
mfspr $vrsave,256
li r9,0x20
mtspr 256,r0
li r10,0x30
lvx_u $Xl,0,$Xip # load Xi
lvx_u $Hl,r8,$Htbl # load pre-computed table
le?lvsl $lemask,r0,r0
lvx_u $H, r9,$Htbl
le?vspltisb $t0,0x07
lvx_u $Hh,r10,$Htbl
le?vxor $lemask,$lemask,$t0
lvx_u $xC2,0,$Htbl
le?vperm $Xl,$Xl,$Xl,$lemask
vxor $zero,$zero,$zero
lvx_u $IN,0,$inp
addi $inp,$inp,16
subi $len,$len,16
le?vperm $IN,$IN,$IN,$lemask
vxor $IN,$IN,$Xl
b Loop
.align 5
Loop:
subic $len,$len,16
vpmsumd $Xl,$IN,$Hl # H.lo·Xi.lo
subfe. r0,r0,r0 # borrow?-1:0
vpmsumd $Xm,$IN,$H # H.hi·Xi.lo+H.lo·Xi.hi
and r0,r0,$len
vpmsumd $Xh,$IN,$Hh # H.hi·Xi.hi
add $inp,$inp,r0
vpmsumd $t2,$Xl,$xC2 # 1st phase
vsldoi $t0,$Xm,$zero,8
vsldoi $t1,$zero,$Xm,8
vxor $Xl,$Xl,$t0
vxor $Xh,$Xh,$t1
vsldoi $Xl,$Xl,$Xl,8
vxor $Xl,$Xl,$t2
lvx_u $IN,0,$inp
addi $inp,$inp,16
vsldoi $t1,$Xl,$Xl,8 # 2nd phase
vpmsumd $Xl,$Xl,$xC2
le?vperm $IN,$IN,$IN,$lemask
vxor $t1,$t1,$Xh
vxor $IN,$IN,$t1
vxor $IN,$IN,$Xl
beq Loop # did $len-=16 borrow?
vxor $Xl,$Xl,$t1
le?vperm $Xl,$Xl,$Xl,$lemask
stvx_u $Xl,0,$Xip # write out Xi
mtspr 256,$vrsave
blr
.long 0
.byte 0,12,0x14,0,0,0,4,0
.long 0
.size .gcm_ghash_p8,.-.gcm_ghash_p8
.asciz "GHASH for PowerISA 2.07, CRYPTOGAMS by <appro\@openssl.org>"
.align 2
___

foreach (split("\n",$code)) {
if ($flavour =~ /le$/o) { # little-endian
s/le\?//o or
s/be\?/#be#/o;
} else {
s/le\?/#le#/o or
s/be\?//o;
}
print $_,"\n";
}

close STDOUT; # enforce flush

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