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#!/usr/local/bin/perl
#
# The inner loop instruction sequence and the IP/FP modifications are from
# Svend Olaf Mikkelsen <svolaf@inet.uni-c.dk>
# I've added the stuff needed for crypt() but I've not worried about making
# things perfect.
#
$prog="crypt.pl";
# base code is in microsft
# op dest, source
# format.
#
require "desboth.pl";
if ( ($ARGV[0] eq "elf"))
{ require "x86unix.pl"; }
elsif ( ($ARGV[0] eq "a.out"))
{ $aout=1; require "x86unix.pl"; }
elsif ( ($ARGV[0] eq "sol"))
{ $sol=1; require "x86unix.pl"; }
elsif ( ($ARGV[0] eq "cpp"))
{ $cpp=1; require "x86unix.pl"; }
elsif ( ($ARGV[0] eq "win32"))
{ require "x86ms.pl"; }
else
{
print STDERR <<"EOF";
Pick one target type from
elf - linux, FreeBSD etc
a.out - old linux
sol - x86 solaris
cpp - format so x86unix.cpp can be used
win32 - Windows 95/Windows NT
EOF
exit(1);
}
&comment("Don't even think of reading this code");
&comment("It was automatically generated by $prog");
&comment("Which is a perl program used to generate the x86 assember for");
&comment("any of elf, a.out, Win32, or Solaris");
&comment("It can be found in SSLeay 0.6.5+ or in libdes 3.26+");
&comment("eric <eay\@cryptsoft.com>");
&comment("The inner loop instruction sequence and the IP/FP modifications");
&comment("are from Svend Olaf Mikkelsen <svolaf\@inet.uni-c.dk>");
&comment("");
&file("dx86xxxx");
$L="edi";
$R="esi";
&fcrypt_body("fcrypt_body");
&file_end();
sub fcrypt_body
{
local($name,$do_ip)=@_;
&function_begin($name,3,"EXTRN _des_SPtrans:DWORD");
&comment("");
&comment("Load the 2 words");
$ks="ebp";
&xor( $L, $L);
&xor( $R, $R);
&mov($ks,&wparam(1));
&mov(&wtmp(1), 25);
&set_label("start");
for ($i=0; $i<16; $i+=2)
{
&comment("");
&comment("Round $i");
&D_ENCRYPT($i,$L,$R,$i*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
&comment("");
&comment("Round ".sprintf("%d",$i+1));
&D_ENCRYPT($i+1,$R,$L,($i+1)*2,$ks,"des_SPtrans","eax","ebx","ecx","edx");
}
&mov("eax", $L);
&dec(&wtmp(1));
&mov($L, $R);
&mov($R, "eax");
&jnz(&label("start"));
&comment("");
&comment("FP");
&mov("edx",&wparam(0));
&FP_new($R,$L,"eax",3);
&mov(&DWP(0,"edx","",0),"eax");
&mov(&DWP(4,"edx","",0),$L);
&function_end($name);
}
sub D_ENCRYPT
{
local($r,$L,$R,$S,$ks,$desSP,$u,$tmp1,$tmp2,$t)=@_;
&mov( $u, &wparam(2)); # 2
&mov( $t, $R);
&shr( $t, 16); # 1
&mov( $tmp2, &wparam(3)); # 2
&xor( $t, $R); # 1
&and( $u, $t); # 2
&and( $t, $tmp2); # 2
&mov( $tmp1, $u);
&shl( $tmp1, 16); # 1
&mov( $tmp2, $t);
&shl( $tmp2, 16); # 1
&xor( $u, $tmp1); # 2
&xor( $t, $tmp2); # 2
&mov( $tmp1, &DWP(&n2a($S*4),$ks,"",0)); # 2
&xor( $u, $tmp1);
&mov( $tmp2, &DWP(&n2a(($S+1)*4),$ks,"",0)); # 2
&xor( $u, $R);
&xor( $t, $R);
&xor( $t, $tmp2);
&and( $u, "0xfcfcfcfc" ); # 2
&xor( $tmp1, $tmp1); # 1
&and( $t, "0xcfcfcfcf" ); # 2
&xor( $tmp2, $tmp2);
&movb( &LB($tmp1), &LB($u) );
&movb( &LB($tmp2), &HB($u) );
&rotr( $t, 4 );
&mov( $ks, &DWP(" $desSP",$tmp1,"",0));
&movb( &LB($tmp1), &LB($t) );
&xor( $L, $ks);
&mov( $ks, &DWP("0x200+$desSP",$tmp2,"",0));
&xor( $L, $ks);
&movb( &LB($tmp2), &HB($t) );
&shr( $u, 16);
&mov( $ks, &DWP("0x100+$desSP",$tmp1,"",0));
&xor( $L, $ks);
&movb( &LB($tmp1), &HB($u) );
&shr( $t, 16);
&mov( $ks, &DWP("0x300+$desSP",$tmp2,"",0));
&xor( $L, $ks);
&mov( $ks, &DWP(24,"esp","",0));
&movb( &LB($tmp2), &HB($t) );
&and( $u, "0xff" );
&and( $t, "0xff" );
&mov( $tmp1, &DWP("0x600+$desSP",$tmp1,"",0));
&xor( $L, $tmp1);
&mov( $tmp1, &DWP("0x700+$desSP",$tmp2,"",0));
&xor( $L, $tmp1);
&mov( $tmp1, &DWP("0x400+$desSP",$u,"",0));
&xor( $L, $tmp1);
&mov( $tmp1, &DWP("0x500+$desSP",$t,"",0));
&xor( $L, $tmp1);
}
sub n2a
{
sprintf("%d",$_[0]);
}
# now has a side affect of rotating $a by $shift
sub R_PERM_OP
{
local($a,$b,$tt,$shift,$mask,$last)=@_;
&rotl( $a, $shift ) if ($shift != 0);
&mov( $tt, $a );
&xor( $a, $b );
&and( $a, $mask );
if ($notlast eq $b)
{
&xor( $b, $a );
&xor( $tt, $a );
}
else
{
&xor( $tt, $a );
&xor( $b, $a );
}
&comment("");
}
sub IP_new
{
local($l,$r,$tt,$lr)=@_;
&R_PERM_OP($l,$r,$tt, 4,"0xf0f0f0f0",$l);
&R_PERM_OP($r,$tt,$l,20,"0xfff0000f",$l);
&R_PERM_OP($l,$tt,$r,14,"0x33333333",$r);
&R_PERM_OP($tt,$r,$l,22,"0x03fc03fc",$r);
&R_PERM_OP($l,$r,$tt, 9,"0xaaaaaaaa",$r);
if ($lr != 3)
{
if (($lr-3) < 0)
{ &rotr($tt, 3-$lr); }
else { &rotl($tt, $lr-3); }
}
if ($lr != 2)
{
if (($lr-2) < 0)
{ &rotr($r, 2-$lr); }
else { &rotl($r, $lr-2); }
}
}
sub FP_new
{
local($l,$r,$tt,$lr)=@_;
if ($lr != 2)
{
if (($lr-2) < 0)
{ &rotl($r, 2-$lr); }
else { &rotr($r, $lr-2); }
}
if ($lr != 3)
{
if (($lr-3) < 0)
{ &rotl($l, 3-$lr); }
else { &rotr($l, $lr-3); }
}
&R_PERM_OP($l,$r,$tt, 0,"0xaaaaaaaa",$r);
&R_PERM_OP($tt,$r,$l,23,"0x03fc03fc",$r);
&R_PERM_OP($l,$r,$tt,10,"0x33333333",$l);
&R_PERM_OP($r,$tt,$l,18,"0xfff0000f",$l);
&R_PERM_OP($l,$tt,$r,12,"0xf0f0f0f0",$r);
&rotr($tt , 4);
}
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