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#!/usr/local/bin/perl
#!/usr/local/bin/perl
$prog="bf586.pl";
# base code is in microsft
# op dest, source
# format.
#
if ( ($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 0.7.0+");
&comment("eric <eay\@cryptsoft.com>");
&comment("");
&file("bfx86xxxx");
$BF_ROUNDS=16;
$BF_OFF=($BF_ROUNDS+2)*4;
$L="ecx";
$R="edx";
$P="edi";
$tot="esi";
$tmp1="eax";
$tmp2="ebx";
$tmp3="ebp";
&des_encrypt("BF_encrypt");
&file_end();
sub des_encrypt
{
local($name)=@_;
&function_begin($name,3,"");
&comment("");
&comment("Load the 2 words");
&mov("eax",&wparam(0));
&mov($L,&DWP(0,"eax","",0));
&mov($R,&DWP(4,"eax","",0));
&comment("");
&comment("P pointer, s and enc flag");
&mov($P,&wparam(1));
&xor( $tmp1, $tmp1);
&xor( $tmp2, $tmp2);
# encrypting part
&mov("ebp",&wparam(2)); # get encrypt flag
&cmp("ebp","0");
&je(&label("start_decrypt"));
&xor($L,&DWP(0,$P,"",0));
for ($i=0; $i<$BF_ROUNDS; $i+=2)
{
&comment("");
&comment("Round $i");
&BF_ENCRYPT($i+1,$R,$L,$P,$tot,$tmp1,$tmp2,$tmp3);
&comment("");
&comment("Round ".sprintf("%d",$i+1));
&BF_ENCRYPT($i+2,$L,$R,$P,$tot,$tmp1,$tmp2,$tmp3);
}
&xor($R,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
&mov("eax",&wparam(0));
&mov(&DWP(0,"eax","",0),$R);
&mov(&DWP(4,"eax","",0),$L);
&function_end_A($name);
&set_label("start_decrypt");
&xor($L,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
for ($i=$BF_ROUNDS; $i>0; $i-=2)
{
&comment("");
&comment("Round $i");
&BF_ENCRYPT($i,$R,$L,$P,$tot,$tmp1,$tmp2,$tmp3);
&comment("");
&comment("Round ".sprintf("%d",$i-1));
&BF_ENCRYPT($i-1,$L,$R,$P,$tot,$tmp1,$tmp2,$tmp3);
}
&xor($R,&DWP(0,$P,"",0));
&mov("eax",&wparam(0));
&mov(&DWP(0,"eax","",0),$R);
&mov(&DWP(4,"eax","",0),$L);
&function_end_A($name);
&function_end_B($name);
}
sub BF_ENCRYPT
{
local($i,$L,$R,$P,$tot,$tmp1,$tmp2,$tmp3)=@_;
&rotr( $R, 16);
&mov( $tot, &DWP(&n2a($i*4),$P,"",0));
&movb( &LB($tmp1), &HB($R));
&movb( &LB($tmp2), &LB($R));
&rotr( $R, 16);
&xor( $L, $tot);
&mov( $tot, &DWP(&n2a($BF_OFF+0x0000),$P,$tmp1,4));
&mov( $tmp3, &DWP(&n2a($BF_OFF+0x0400),$P,$tmp2,4));
&movb( &LB($tmp1), &HB($R));
&movb( &LB($tmp2), &LB($R));
&add( $tot, $tmp3);
&mov( $tmp1, &DWP(&n2a($BF_OFF+0x0800),$P,$tmp1,4)); # delay
&xor( $tot, $tmp1);
&mov( $tmp3, &DWP(&n2a($BF_OFF+0x0C00),$P,$tmp2,4));
&add( $tot, $tmp3);
&xor( $tmp1, $tmp1);
&xor( $L, $tot);
# delay
}
sub n2a
{
sprintf("%d",$_[0]);
}
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