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#!/usr/local/bin/perl
$prog="des686.pl";
# base code is in microsft
# op dest, source
# format.
#
# WILL NOT WORK ANYMORE WITH desboth.pl
require "desboth.pl";
if ( ($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("");
&file("dx86xxxx");
$L="edi";
$R="esi";
&des_encrypt("des_encrypt1",1);
&des_encrypt("des_encrypt2",0);
&des_encrypt3("des_encrypt3",1);
&des_encrypt3("des_decrypt3",0);
&file_end();
sub des_encrypt
{
local($name,$do_ip)=@_;
&function_begin($name,"EXTRN _des_SPtrans:DWORD");
&comment("");
&comment("Load the 2 words");
&mov("eax",&wparam(0));
&mov($L,&DWP(0,"eax","",0));
&mov($R,&DWP(4,"eax","",0));
$ksp=&wparam(1);
if ($do_ip)
{
&comment("");
&comment("IP");
&IP_new($L,$R,"eax");
}
&comment("");
&comment("fixup rotate");
&rotl($R,3);
&rotl($L,3);
&exch($L,$R);
&comment("");
&comment("load counter, key_schedule and enc flag");
&mov("eax",&wparam(2)); # get encrypt flag
&mov("ebp",&wparam(1)); # get ks
&cmp("eax","0");
&je(&label("start_decrypt"));
# encrypting part
for ($i=0; $i<16; $i+=2)
{
&comment("");
&comment("Round $i");
&D_ENCRYPT($L,$R,$i*2,"ebp","des_SPtrans","ecx","edx","eax","ebx");
&comment("");
&comment("Round ".sprintf("%d",$i+1));
&D_ENCRYPT($R,$L,($i+1)*2,"ebp","des_SPtrans","ecx","edx","eax","ebx");
}
&jmp(&label("end"));
&set_label("start_decrypt");
for ($i=15; $i>0; $i-=2)
{
&comment("");
&comment("Round $i");
&D_ENCRYPT($L,$R,$i*2,"ebp","des_SPtrans","ecx","edx","eax","ebx");
&comment("");
&comment("Round ".sprintf("%d",$i-1));
&D_ENCRYPT($R,$L,($i-1)*2,"ebp","des_SPtrans","ecx","edx","eax","ebx");
}
&set_label("end");
&comment("");
&comment("Fixup");
&rotr($L,3); # r
&rotr($R,3); # l
if ($do_ip)
{
&comment("");
&comment("FP");
&FP_new($R,$L,"eax");
}
&mov("eax",&wparam(0));
&mov(&DWP(0,"eax","",0),$L);
&mov(&DWP(4,"eax","",0),$R);
&function_end($name);
}
# The logic is to load R into 2 registers and operate on both at the same time.
# We also load the 2 R's into 2 more registers so we can do the 'move word down a byte'
# while also masking the other copy and doing a lookup. We then also accumulate the
# L value in 2 registers then combine them at the end.
sub D_ENCRYPT
{
local($L,$R,$S,$ks,$desSP,$u,$t,$tmp1,$tmp2,$tmp3)=@_;
&mov( $u, &DWP(&n2a($S*4),$ks,"",0));
&mov( $t, &DWP(&n2a(($S+1)*4),$ks,"",0));
&xor( $u, $R );
&xor( $t, $R );
&rotr( $t, 4 );
# the numbers at the end of the line are origional instruction order
&mov( $tmp2, $u ); # 1 2
&mov( $tmp1, $t ); # 1 1
&and( $tmp2, "0xfc" ); # 1 4
&and( $tmp1, "0xfc" ); # 1 3
&shr( $t, 8 ); # 1 5
&xor( $L, &DWP("0x100+$desSP",$tmp1,"",0)); # 1 7
&shr( $u, 8 ); # 1 6
&mov( $tmp1, &DWP(" $desSP",$tmp2,"",0)); # 1 8
&mov( $tmp2, $u ); # 2 2
&xor( $L, $tmp1 ); # 1 9
&and( $tmp2, "0xfc" ); # 2 4
&mov( $tmp1, $t ); # 2 1
&and( $tmp1, "0xfc" ); # 2 3
&shr( $t, 8 ); # 2 5
&xor( $L, &DWP("0x300+$desSP",$tmp1,"",0)); # 2 7
&shr( $u, 8 ); # 2 6
&mov( $tmp1, &DWP("0x200+$desSP",$tmp2,"",0)); # 2 8
&mov( $tmp2, $u ); # 3 2
&xor( $L, $tmp1 ); # 2 9
&and( $tmp2, "0xfc" ); # 3 4
&mov( $tmp1, $t ); # 3 1
&shr( $u, 8 ); # 3 6
&and( $tmp1, "0xfc" ); # 3 3
&shr( $t, 8 ); # 3 5
&xor( $L, &DWP("0x500+$desSP",$tmp1,"",0)); # 3 7
&mov( $tmp1, &DWP("0x400+$desSP",$tmp2,"",0)); # 3 8
&and( $t, "0xfc" ); # 4 1
&xor( $L, $tmp1 ); # 3 9
&and( $u, "0xfc" ); # 4 2
&xor( $L, &DWP("0x700+$desSP",$t,"",0)); # 4 3
&xor( $L, &DWP("0x600+$desSP",$u,"",0)); # 4 4
}
sub PERM_OP
{
local($a,$b,$tt,$shift,$mask)=@_;
&mov( $tt, $a );
&shr( $tt, $shift );
&xor( $tt, $b );
&and( $tt, $mask );
&xor( $b, $tt );
&shl( $tt, $shift );
&xor( $a, $tt );
}
sub IP_new
{
local($l,$r,$tt)=@_;
&PERM_OP($r,$l,$tt, 4,"0x0f0f0f0f");
&PERM_OP($l,$r,$tt,16,"0x0000ffff");
&PERM_OP($r,$l,$tt, 2,"0x33333333");
&PERM_OP($l,$r,$tt, 8,"0x00ff00ff");
&PERM_OP($r,$l,$tt, 1,"0x55555555");
}
sub FP_new
{
local($l,$r,$tt)=@_;
&PERM_OP($l,$r,$tt, 1,"0x55555555");
&PERM_OP($r,$l,$tt, 8,"0x00ff00ff");
&PERM_OP($l,$r,$tt, 2,"0x33333333");
&PERM_OP($r,$l,$tt,16,"0x0000ffff");
&PERM_OP($l,$r,$tt, 4,"0x0f0f0f0f");
}
sub n2a
{
sprintf("%d",$_[0]);
}
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