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#!/usr/bin/env perl
#
# ====================================================================
# Written by Andy Polyakov <appro@fy.chalmers.se> 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/.
# ====================================================================
#
# February 2009
#
# Performance is 2x of gcc 3.4.6 on z10. Coding "secret" is to
# "cluster" Address Generation Interlocks, so that one pipeline stall
# resolves several dependencies.
$rp="%r14";
$sp="%r15";
$code=<<___;
.text
___
# void RC4(RC4_KEY *key,size_t len,const void *inp,void *out)
{
$acc="%r0";
$cnt="%r1";
$key="%r2";
$len="%r3";
$inp="%r4";
$out="%r5";
@XX=("%r6","%r7");
@TX=("%r8","%r9");
$YY="%r10";
$TY="%r11";
$code.=<<___;
.globl RC4
.type RC4,\@function
.align 64
RC4:
stmg %r6,%r11,48($sp)
llgc $XX[0],0($key)
llgc $YY,1($key)
la $XX[0],1($XX[0])
nill $XX[0],0xff
srlg $cnt,$len,3
ltgr $cnt,$cnt
llgc $TX[0],2($XX[0],$key)
jz .Lshort
j .Loop8
.align 64
.Loop8:
___
for ($i=0;$i<8;$i++) {
$code.=<<___;
la $YY,0($YY,$TX[0]) # $i
nill $YY,255
la $XX[1],1($XX[0])
nill $XX[1],255
___
$code.=<<___ if ($i==1);
llgc $acc,2($TY,$key)
___
$code.=<<___ if ($i>1);
sllg $acc,$acc,8
ic $acc,2($TY,$key)
___
$code.=<<___;
llgc $TY,2($YY,$key)
stc $TX[0],2($YY,$key)
llgc $TX[1],2($XX[1],$key)
stc $TY,2($XX[0],$key)
cr $XX[1],$YY
jne .Lcmov$i
la $TX[1],0($TX[0])
.Lcmov$i:
la $TY,0($TY,$TX[0])
nill $TY,255
___
push(@TX,shift(@TX)); push(@XX,shift(@XX)); # "rotate" registers
}
$code.=<<___;
lg $TX[1],0($inp)
sllg $acc,$acc,8
la $inp,8($inp)
ic $acc,2($TY,$key)
xgr $acc,$TX[1]
stg $acc,0($out)
la $out,8($out)
brct $cnt,.Loop8
.Lshort:
lghi $acc,7
ngr $len,$acc
jz .Lexit
j .Loop1
.align 16
.Loop1:
la $YY,0($YY,$TX[0])
nill $YY,255
llgc $TY,2($YY,$key)
stc $TX[0],2($YY,$key)
stc $TY,2($XX[0],$key)
ar $TY,$TX[0]
ahi $XX[0],1
nill $TY,255
nill $XX[0],255
llgc $acc,0($inp)
la $inp,1($inp)
llgc $TY,2($TY,$key)
llgc $TX[0],2($XX[0],$key)
xr $acc,$TY
stc $acc,0($out)
la $out,1($out)
brct $len,.Loop1
.Lexit:
ahi $XX[0],-1
stc $XX[0],0($key)
stc $YY,1($key)
lmg %r6,%r11,48($sp)
br $rp
.size RC4,.-RC4
.string "RC4 for s390x, CRYPTOGAMS by <appro\@openssl.org>"
___
}
# void RC4_set_key(RC4_KEY *key,unsigned int len,const void *inp)
{
$cnt="%r0";
$idx="%r1";
$key="%r2";
$len="%r3";
$inp="%r4";
$acc="%r5";
$dat="%r6";
$ikey="%r7";
$iinp="%r8";
$code.=<<___;
.globl RC4_set_key
.type RC4_set_key,\@function
.align 64
RC4_set_key:
stmg %r6,%r8,48($sp)
lhi $cnt,256
la $idx,0(%r0)
sth $idx,0($key)
.align 4
.L1stloop:
stc $idx,2($idx,$key)
la $idx,1($idx)
brct $cnt,.L1stloop
lghi $ikey,-256
lr $cnt,$len
la $iinp,0(%r0)
la $idx,0(%r0)
.align 16
.L2ndloop:
llgc $acc,2+256($ikey,$key)
llgc $dat,0($iinp,$inp)
la $idx,0($idx,$acc)
la $ikey,1($ikey)
la $idx,0($idx,$dat)
nill $idx,255
la $iinp,1($iinp)
tml $ikey,255
llgc $dat,2($idx,$key)
stc $dat,2+256-1($ikey,$key)
stc $acc,2($idx,$key)
jz .Ldone
brct $cnt,.L2ndloop
lr $cnt,$len
la $iinp,0(%r0)
j .L2ndloop
.Ldone:
lmg %r6,%r8,48($sp)
br $rp
.size RC4_set_key,.-RC4_set_key
___
}
# const char *RC4_options()
$code.=<<___;
.globl RC4_options
.type RC4_options,\@function
.align 16
RC4_options:
larl %r2,.Loptions
br %r14
.size RC4_options,.-RC4_options
.section .rodata
.Loptions:
.align 8
.string "rc4(8x,char)"
___
print $code;
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