110 lines
1.9 KiB
Raku
110 lines
1.9 KiB
Raku
#!/usr/local/bin/perl
|
|
|
|
push(@INC,"perlasm","../../perlasm");
|
|
require "x86asm.pl";
|
|
require "cbc.pl";
|
|
|
|
&asm_init($ARGV[0],"rc5-586.pl");
|
|
|
|
$RC5_MAX_ROUNDS=16;
|
|
$RC5_32_OFF=($RC5_MAX_ROUNDS+2)*4;
|
|
$A="edi";
|
|
$B="esi";
|
|
$S="ebp";
|
|
$tmp1="eax";
|
|
$r="ebx";
|
|
$tmpc="ecx";
|
|
$tmp4="edx";
|
|
|
|
&RC5_32_encrypt("RC5_32_encrypt",1);
|
|
&RC5_32_encrypt("RC5_32_decrypt",0);
|
|
&cbc("RC5_32_cbc_encrypt","RC5_32_encrypt","RC5_32_decrypt",0,4,5,3,-1,-1);
|
|
&asm_finish();
|
|
|
|
sub RC5_32_encrypt
|
|
{
|
|
local($name,$enc)=@_;
|
|
|
|
&function_begin_B($name,"");
|
|
|
|
&comment("");
|
|
|
|
&push("ebp");
|
|
&push("esi");
|
|
&push("edi");
|
|
&mov($tmp4,&wparam(0));
|
|
&mov($S,&wparam(1));
|
|
|
|
&comment("Load the 2 words");
|
|
&mov($A,&DWP(0,$tmp4,"",0));
|
|
&mov($B,&DWP(4,$tmp4,"",0));
|
|
|
|
&push($r);
|
|
&mov($r, &DWP(0,$S,"",0));
|
|
|
|
# encrypting part
|
|
|
|
if ($enc)
|
|
{
|
|
&add($A, &DWP(4+0,$S,"",0));
|
|
&add($B, &DWP(4+4,$S,"",0));
|
|
|
|
for ($i=0; $i<$RC5_MAX_ROUNDS; $i++)
|
|
{
|
|
&xor($A, $B);
|
|
&mov($tmp1, &DWP(12+$i*8,$S,"",0));
|
|
&mov($tmpc, $B);
|
|
&rotl($A, &LB("ecx"));
|
|
&add($A, $tmp1);
|
|
|
|
&xor($B, $A);
|
|
&mov($tmp1, &DWP(16+$i*8,$S,"",0));
|
|
&mov($tmpc, $A);
|
|
&rotl($B, &LB("ecx"));
|
|
&add($B, $tmp1);
|
|
if (($i == 7) || ($i == 11))
|
|
{
|
|
&cmp($r, $i+1);
|
|
&je(&label("rc5_exit"));
|
|
}
|
|
}
|
|
}
|
|
else
|
|
{
|
|
&cmp($r, 12);
|
|
&je(&label("rc5_dec_12"));
|
|
&cmp($r, 8);
|
|
&je(&label("rc5_dec_8"));
|
|
for ($i=$RC5_MAX_ROUNDS; $i > 0; $i--)
|
|
{
|
|
&set_label("rc5_dec_$i") if ($i == 12) || ($i == 8);
|
|
&mov($tmp1, &DWP($i*8+8,$S,"",0));
|
|
&sub($B, $tmp1);
|
|
&mov($tmpc, $A);
|
|
&rotr($B, &LB("ecx"));
|
|
&xor($B, $A);
|
|
|
|
&mov($tmp1, &DWP($i*8+4,$S,"",0));
|
|
&sub($A, $tmp1);
|
|
&mov($tmpc, $B);
|
|
&rotr($A, &LB("ecx"));
|
|
&xor($A, $B);
|
|
}
|
|
&sub($B, &DWP(4+4,$S,"",0));
|
|
&sub($A, &DWP(4+0,$S,"",0));
|
|
}
|
|
|
|
&set_label("rc5_exit");
|
|
&mov(&DWP(0,$tmp4,"",0),$A);
|
|
&mov(&DWP(4,$tmp4,"",0),$B);
|
|
|
|
&pop("ebx");
|
|
&pop("edi");
|
|
&pop("esi");
|
|
&pop("ebp");
|
|
&ret();
|
|
&function_end_B($name);
|
|
}
|
|
|
|
|