--- /dev/null
+#!/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/.
+# ====================================================================
+#
+# GHASH for 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 $vrsave="r12";
+
+$code=<<___;
+.machine "any"
+
+.text
+
+.globl .gcm_init_p8
+.align 5
+.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
+
+ 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_gmult_p8
+.align 5
+.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
+.align 5
+.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
projects / oweals / openssl.git / commitdiff