136 lines
2.5 KiB
Raku
136 lines
2.5 KiB
Raku
#!/usr/local/bin/perl
|
|
|
|
push(@INC,"perlasm","../../perlasm");
|
|
require "x86asm.pl";
|
|
require "cbc.pl";
|
|
|
|
&asm_init($ARGV[0],"bf-586.pl");
|
|
|
|
$BF_ROUNDS=16;
|
|
$BF_OFF=($BF_ROUNDS+2)*4;
|
|
$L="edi";
|
|
$R="esi";
|
|
$P="ebp";
|
|
$tmp1="eax";
|
|
$tmp2="ebx";
|
|
$tmp3="ecx";
|
|
$tmp4="edx";
|
|
|
|
&BF_encrypt("BF_encrypt",1);
|
|
&BF_encrypt("BF_decrypt",0);
|
|
&cbc("BF_cbc_encrypt","BF_encrypt","BF_decrypt",1,4,5,3,-1,-1);
|
|
&asm_finish();
|
|
|
|
sub BF_encrypt
|
|
{
|
|
local($name,$enc)=@_;
|
|
|
|
&function_begin_B($name,"");
|
|
|
|
&comment("");
|
|
|
|
&push("ebp");
|
|
&push("ebx");
|
|
&mov($tmp2,&wparam(0));
|
|
&mov($P,&wparam(1));
|
|
&push("esi");
|
|
&push("edi");
|
|
|
|
&comment("Load the 2 words");
|
|
&mov($L,&DWP(0,$tmp2,"",0));
|
|
&mov($R,&DWP(4,$tmp2,"",0));
|
|
|
|
&xor( $tmp1, $tmp1);
|
|
|
|
# encrypting part
|
|
|
|
if ($enc)
|
|
{
|
|
&mov($tmp2,&DWP(0,$P,"",0));
|
|
&xor( $tmp3, $tmp3);
|
|
|
|
&xor($L,$tmp2);
|
|
for ($i=0; $i<$BF_ROUNDS; $i+=2)
|
|
{
|
|
&comment("");
|
|
&comment("Round $i");
|
|
&BF_ENCRYPT($i+1,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,1);
|
|
|
|
&comment("");
|
|
&comment("Round ".sprintf("%d",$i+1));
|
|
&BF_ENCRYPT($i+2,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,1);
|
|
}
|
|
# &mov($tmp1,&wparam(0)); In last loop
|
|
&mov($tmp4,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
|
|
}
|
|
else
|
|
{
|
|
&mov($tmp2,&DWP(($BF_ROUNDS+1)*4,$P,"",0));
|
|
&xor( $tmp3, $tmp3);
|
|
|
|
&xor($L,$tmp2);
|
|
for ($i=$BF_ROUNDS; $i>0; $i-=2)
|
|
{
|
|
&comment("");
|
|
&comment("Round $i");
|
|
&BF_ENCRYPT($i,$R,$L,$P,$tmp1,$tmp2,$tmp3,$tmp4,0);
|
|
&comment("");
|
|
&comment("Round ".sprintf("%d",$i-1));
|
|
&BF_ENCRYPT($i-1,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,0);
|
|
}
|
|
# &mov($tmp1,&wparam(0)); In last loop
|
|
&mov($tmp4,&DWP(0,$P,"",0));
|
|
}
|
|
|
|
&xor($R,$tmp4);
|
|
&mov(&DWP(4,$tmp1,"",0),$L);
|
|
|
|
&mov(&DWP(0,$tmp1,"",0),$R);
|
|
&function_end($name);
|
|
}
|
|
|
|
sub BF_ENCRYPT
|
|
{
|
|
local($i,$L,$R,$P,$tmp1,$tmp2,$tmp3,$tmp4,$enc)=@_;
|
|
|
|
&mov( $tmp4, &DWP(&n2a($i*4),$P,"",0)); # for next round
|
|
|
|
&mov( $tmp2, $R);
|
|
&xor( $L, $tmp4);
|
|
|
|
&shr( $tmp2, 16);
|
|
&mov( $tmp4, $R);
|
|
|
|
&movb( &LB($tmp1), &HB($tmp2)); # A
|
|
&and( $tmp2, 0xff); # B
|
|
|
|
&movb( &LB($tmp3), &HB($tmp4)); # C
|
|
&and( $tmp4, 0xff); # D
|
|
|
|
&mov( $tmp1, &DWP(&n2a($BF_OFF+0x0000),$P,$tmp1,4));
|
|
&mov( $tmp2, &DWP(&n2a($BF_OFF+0x0400),$P,$tmp2,4));
|
|
|
|
&add( $tmp2, $tmp1);
|
|
&mov( $tmp1, &DWP(&n2a($BF_OFF+0x0800),$P,$tmp3,4));
|
|
|
|
&xor( $tmp2, $tmp1);
|
|
&mov( $tmp4, &DWP(&n2a($BF_OFF+0x0C00),$P,$tmp4,4));
|
|
|
|
&add( $tmp2, $tmp4);
|
|
if (($enc && ($i != 16)) || ((!$enc) && ($i != 1)))
|
|
{ &xor( $tmp1, $tmp1); }
|
|
else
|
|
{
|
|
&comment("Load parameter 0 ($i) enc=$enc");
|
|
&mov($tmp1,&wparam(0));
|
|
} # In last loop
|
|
|
|
&xor( $L, $tmp2);
|
|
# delay
|
|
}
|
|
|
|
sub n2a
|
|
{
|
|
sprintf("%d",$_[0]);
|
|
}
|
|
|