235 lines
4.3 KiB
Raku
235 lines
4.3 KiB
Raku
#!/usr/bin/env perl
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#
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# ====================================================================
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# Written by Andy Polyakov <appro@fy.chalmers.se> 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 http://www.openssl.org/~appro/cryptogams/.
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# ====================================================================
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#
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# February 2009
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#
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# Performance is 2x of gcc 3.4.6 on z10. Coding "secret" is to
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# "cluster" Address Generation Interlocks, so that one pipeline stall
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# resolves several dependencies.
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# November 2010.
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#
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# Adapt for -m31 build. If kernel supports what's called "highgprs"
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# feature on Linux [see /proc/cpuinfo], it's possible to use 64-bit
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# instructions and achieve "64-bit" performance even in 31-bit legacy
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# application context. The feature is not specific to any particular
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# processor, as long as it's "z-CPU". Latter implies that the code
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# remains z/Architecture specific. On z990 it was measured to perform
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# 50% better than code generated by gcc 4.3.
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$flavour = shift;
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if ($flavour =~ /3[12]/) {
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$SIZE_T=4;
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$g="";
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} else {
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$SIZE_T=8;
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$g="g";
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}
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while (($output=shift) && ($output!~/^\w[\w\-]*\.\w+$/)) {}
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open STDOUT,">$output";
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$rp="%r14";
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$sp="%r15";
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$code=<<___;
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.text
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___
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# void RC4(RC4_KEY *key,size_t len,const void *inp,void *out)
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{
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$acc="%r0";
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$cnt="%r1";
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$key="%r2";
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$len="%r3";
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$inp="%r4";
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$out="%r5";
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@XX=("%r6","%r7");
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@TX=("%r8","%r9");
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$YY="%r10";
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$TY="%r11";
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$code.=<<___;
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.globl RC4
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.type RC4,\@function
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.align 64
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RC4:
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stm${g} %r6,%r11,6*$SIZE_T($sp)
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___
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$code.=<<___ if ($flavour =~ /3[12]/);
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llgfr $len,$len
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___
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$code.=<<___;
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llgc $XX[0],0($key)
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llgc $YY,1($key)
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la $XX[0],1($XX[0])
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nill $XX[0],0xff
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srlg $cnt,$len,3
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ltgr $cnt,$cnt
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llgc $TX[0],2($XX[0],$key)
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jz .Lshort
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j .Loop8
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.align 64
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.Loop8:
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___
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for ($i=0;$i<8;$i++) {
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$code.=<<___;
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la $YY,0($YY,$TX[0]) # $i
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nill $YY,255
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la $XX[1],1($XX[0])
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nill $XX[1],255
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___
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$code.=<<___ if ($i==1);
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llgc $acc,2($TY,$key)
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___
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$code.=<<___ if ($i>1);
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sllg $acc,$acc,8
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ic $acc,2($TY,$key)
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___
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$code.=<<___;
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llgc $TY,2($YY,$key)
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stc $TX[0],2($YY,$key)
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llgc $TX[1],2($XX[1],$key)
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stc $TY,2($XX[0],$key)
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cr $XX[1],$YY
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jne .Lcmov$i
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la $TX[1],0($TX[0])
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.Lcmov$i:
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la $TY,0($TY,$TX[0])
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nill $TY,255
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___
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push(@TX,shift(@TX)); push(@XX,shift(@XX)); # "rotate" registers
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}
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$code.=<<___;
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lg $TX[1],0($inp)
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sllg $acc,$acc,8
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la $inp,8($inp)
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ic $acc,2($TY,$key)
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xgr $acc,$TX[1]
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stg $acc,0($out)
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la $out,8($out)
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brctg $cnt,.Loop8
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.Lshort:
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lghi $acc,7
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ngr $len,$acc
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jz .Lexit
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j .Loop1
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.align 16
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.Loop1:
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la $YY,0($YY,$TX[0])
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nill $YY,255
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llgc $TY,2($YY,$key)
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stc $TX[0],2($YY,$key)
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stc $TY,2($XX[0],$key)
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ar $TY,$TX[0]
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ahi $XX[0],1
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nill $TY,255
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nill $XX[0],255
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llgc $acc,0($inp)
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la $inp,1($inp)
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llgc $TY,2($TY,$key)
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llgc $TX[0],2($XX[0],$key)
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xr $acc,$TY
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stc $acc,0($out)
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la $out,1($out)
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brct $len,.Loop1
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.Lexit:
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ahi $XX[0],-1
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stc $XX[0],0($key)
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stc $YY,1($key)
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lm${g} %r6,%r11,6*$SIZE_T($sp)
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br $rp
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.size RC4,.-RC4
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.string "RC4 for s390x, CRYPTOGAMS by <appro\@openssl.org>"
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___
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}
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# void RC4_set_key(RC4_KEY *key,unsigned int len,const void *inp)
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{
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$cnt="%r0";
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$idx="%r1";
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$key="%r2";
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$len="%r3";
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$inp="%r4";
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$acc="%r5";
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$dat="%r6";
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$ikey="%r7";
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$iinp="%r8";
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$code.=<<___;
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.globl private_RC4_set_key
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.type private_RC4_set_key,\@function
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.align 64
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private_RC4_set_key:
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stm${g} %r6,%r8,6*$SIZE_T($sp)
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lhi $cnt,256
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la $idx,0(%r0)
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sth $idx,0($key)
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.align 4
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.L1stloop:
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stc $idx,2($idx,$key)
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la $idx,1($idx)
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brct $cnt,.L1stloop
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lghi $ikey,-256
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lr $cnt,$len
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la $iinp,0(%r0)
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la $idx,0(%r0)
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.align 16
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.L2ndloop:
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llgc $acc,2+256($ikey,$key)
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llgc $dat,0($iinp,$inp)
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la $idx,0($idx,$acc)
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la $ikey,1($ikey)
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la $idx,0($idx,$dat)
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nill $idx,255
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la $iinp,1($iinp)
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tml $ikey,255
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llgc $dat,2($idx,$key)
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stc $dat,2+256-1($ikey,$key)
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stc $acc,2($idx,$key)
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jz .Ldone
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brct $cnt,.L2ndloop
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lr $cnt,$len
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la $iinp,0(%r0)
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j .L2ndloop
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.Ldone:
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lm${g} %r6,%r8,6*$SIZE_T($sp)
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br $rp
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.size private_RC4_set_key,.-private_RC4_set_key
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___
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}
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# const char *RC4_options()
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$code.=<<___;
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.globl RC4_options
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.type RC4_options,\@function
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.align 16
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RC4_options:
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larl %r2,.Loptions
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br %r14
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.size RC4_options,.-RC4_options
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.section .rodata
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.Loptions:
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.align 8
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.string "rc4(8x,char)"
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___
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print $code;
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close STDOUT; # force flush
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