crypt.pm

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	0x00401081, 0x00001001, 0x00001080, 0x00000000,
	0x00400000, 0x00400081, 0x00000081, 0x00401000,
	0x00000001, 0x00401080, 0x00401000, 0x00000081,
	0x00400081, 0x00001000, 0x00001001, 0x00401081,
	0x00000000, 0x00400080, 0x00400001, 0x00001080,
	0x00401001, 0x00001081, 0x00401080, 0x00000001,
	0x00001081, 0x00401001, 0x00000080, 0x00400000,
	0x00001081, 0x00401000, 0x00401001, 0x00000081,
	0x00001000, 0x00000080, 0x00400000, 0x00401001,
	0x00400081, 0x00001081, 0x00001080, 0x00000000,
	0x00000080, 0x00400001, 0x00000001, 0x00400080,
	0x00000000, 0x00400081, 0x00400080, 0x00001080,
	0x00000081, 0x00001000, 0x00401081, 0x00400000,
	0x00401080, 0x00000001, 0x00001001, 0x00401081,
	0x00400001, 0x00401080, 0x00401000, 0x00001001,
);
my @SPtrans7 =
(
	# nibble 7
	0x08200020, 0x08208000, 0x00008020, 0x00000000,
	0x08008000, 0x00200020, 0x08200000, 0x08208020,
	0x00000020, 0x08000000, 0x00208000, 0x00008020,
	0x00208020, 0x08008020, 0x08000020, 0x08200000,
	0x00008000, 0x00208020, 0x00200020, 0x08008000,
	0x08208020, 0x08000020, 0x00000000, 0x00208000,
	0x08000000, 0x00200000, 0x08008020, 0x08200020,
	0x00200000, 0x00008000, 0x08208000, 0x00000020,
	0x00200000, 0x00008000, 0x08000020, 0x08208020,
	0x00008020, 0x08000000, 0x00000000, 0x00208000,
	0x08200020, 0x08008020, 0x08008000, 0x00200020,
	0x08208000, 0x00000020, 0x00200020, 0x08008000,
	0x08208020, 0x00200000, 0x08200000, 0x08000020,
	0x00208000, 0x00008020, 0x08008020, 0x08200000,
	0x00000020, 0x08208000, 0x00208020, 0x00000000,
	0x08000000, 0x08200020, 0x00008000, 0x00208020
);

my @cov_2char =
(
	0x2E, 0x2F, 0x30, 0x31, 0x32, 0x33, 0x34, 0x35, 
	0x36, 0x37, 0x38, 0x39, 0x41, 0x42, 0x43, 0x44, 
	0x45, 0x46, 0x47, 0x48, 0x49, 0x4A, 0x4B, 0x4C, 
	0x4D, 0x4E, 0x4F, 0x50, 0x51, 0x52, 0x53, 0x54, 
	0x55, 0x56, 0x57, 0x58, 0x59, 0x5A, 0x61, 0x62, 
	0x63, 0x64, 0x65, 0x66, 0x67, 0x68, 0x69, 0x6A, 
	0x6B, 0x6C, 0x6D, 0x6E, 0x6F, 0x70, 0x71, 0x72, 
	0x73, 0x74, 0x75, 0x76, 0x77, 0x78, 0x79, 0x7A
);

sub ushr  # only for ints!
{
	my ($n, $s) = @_;

	$s &= 0x1f;

	return( ($n >> $s) & (~0 >> $s) );
}

sub toByte
{
	my $value = shift;

	$value &= 0xff;
	$value = - ((~$value & 0xff) + 1) if ($value & 0x80);

	return $value;
}

sub toInt
{
	my $value = shift;

	$value = - ((~$value & 0xffffffff) + 1) if ($value & 0x80000000);

	return $value;
}

sub byteToUnsigned # int byteToUnsigned(byte b)
{
	my $value = shift;

	return( $value >= 0 ? $value : $value + 256 );
}

sub fourBytesToInt # int fourBytesToInt(byte b[], int offset)
{
	my ($b, $offset) = @_;
	my $value;

	$value  =  byteToUnsigned($b->[$offset++]);
	$value |= (byteToUnsigned($b->[$offset++]) <<  8);
	$value |= (byteToUnsigned($b->[$offset++]) << 16);
	$value |= (byteToUnsigned($b->[$offset++]) << 24);

	return toInt($value);
}

sub intToFourBytes # void intToFourBytes(int iValue, byte b[], int offset)
{
	my ($iValue, $b, $offset) = @_;

	$b->[$offset++] = toByte(ushr($iValue, 0) & 0xff);
	$b->[$offset++] = toByte(ushr($iValue, 8) & 0xff);
	$b->[$offset++] = toByte(ushr($iValue,16) & 0xff);
	$b->[$offset++] = toByte(ushr($iValue,24) & 0xff);

	return undef;
}

sub PERM_OP # void PERM_OP(int a, int b, int n, int m, int results[])
{
	my ($a, $b, $n, $m, $results) = @_;
	my $t;

	$t = (ushr($a,$n) ^ $b) & $m;
	$a ^= $t << $n;
	$b ^= $t;

	$results->[0] = toInt($a);
	$results->[1] = toInt($b);

	return undef;
}

sub HPERM_OP # void HPERM_OP(int a, int n, int m)
{
	my ($a, $n, $m) = @_;
	my $t;

	$t = (($a << (16 - $n)) ^ $a) & $m;
	$a = $a ^ $t ^ ushr($t, 16 - $n);

	return toInt($a);
}

sub des_set_key # int [] des_set_key(byte key[])
{
	my ($key) = @_;
	my @schedule; $#schedule = $ITERATIONS * 2 -1;

	my $c = fourBytesToInt($key, 0);
	my $d = fourBytesToInt($key, 4);

	my @results; $#results = 1;

	PERM_OP($d, $c, 4, 0x0f0f0f0f, \@results);
	$d = $results[0]; $c = $results[1];

	$c = HPERM_OP($c, -2, 0xcccc0000);
	$d = HPERM_OP($d, -2, 0xcccc0000);

	PERM_OP($d, $c, 1, 0x55555555, \@results);
	$d = $results[0]; $c = $results[1];

	PERM_OP($c, $d, 8, 0x00ff00ff, \@results);
	$c = $results[0]; $d = $results[1];

	PERM_OP($d, $c, 1, 0x55555555, \@results);
	$d = $results[0]; $c = $results[1];

	$d = (    (($d & 0x000000ff) << 16) |     ($d & 0x0000ff00)  |
	       ushr($d & 0x00ff0000,    16) | ushr($c & 0xf0000000, 4));
	$c &= 0x0fffffff;

	my ($s, $t);
	my ($i, $j);

	$j = 0;
	for($i = 0; $i < $ITERATIONS; $i++)
	{
		if($shifts2[$i])
		{
			$c = ushr($c, 2) | ($c << 26);
			$d = ushr($d, 2) | ($d << 26);
		}
		else
		{
			$c = ushr($c, 1) | ($c << 27);
			$d = ushr($d, 1) | ($d << 27);
		}

		$c &= 0x0fffffff;
		$d &= 0x0fffffff;

		$s = $skb0[     ($c   ) & 0x3f                        ]|
		     $skb1[(ushr($c, 6) & 0x03) | (ushr($c, 7) & 0x3c)]|
		     $skb2[(ushr($c,13) & 0x0f) | (ushr($c,14) & 0x30)]|
		     $skb3[(ushr($c,20) & 0x01) | (ushr($c,21) & 0x06) |
		                                  (ushr($c,22) & 0x38)];

		$t = $skb4[     ($d   ) & 0x3f                         ]|
		     $skb5[(ushr($d, 7) & 0x03) | (ushr($d, 8) & 0x3c) ]|
		     $skb6[ ushr($d,15) & 0x3f                         ]|
		     $skb7[(ushr($d,21) & 0x0f) | (ushr($d,22) & 0x30)];

		$schedule[$j++] = (    ($t << 16) | ($s & 0x0000ffff)) & 0xffffffff;
		$s              = (ushr($s,   16) | ($t & 0xffff0000));

		$s              = ($s << 4) | ushr($s,28);
		$schedule[$j++] = $s & 0xffffffff;
	}

	return \@schedule;
}

sub D_ENCRYPT # int D_ENCRYPT(int L, int R, int S, int E0, int E1, int s[])
{
	my ($L, $R, $S, $E0, $E1, $s) = @_;
	my ($t, $u, $v);

	$v = $R ^ ushr($R,16);
	$u = $v & $E0;
	$v = $v & $E1;
	$u = ($u ^ ($u << 16)) ^ $R ^ $s->[$S];
	$t = ($v ^ ($v << 16)) ^ $R ^ $s->[$S + 1];
	$t = ushr($t, 4) | ($t << 28);

	$L ^= $SPtrans1[    ($t    ) & 0x3f] |
	      $SPtrans3[ushr($t,  8) & 0x3f] |
	      $SPtrans5[ushr($t, 16) & 0x3f] |
	      $SPtrans7[ushr($t, 24) & 0x3f] |
	      $SPtrans0[    ($u    ) & 0x3f] |
	      $SPtrans2[ushr($u,  8) & 0x3f] |
	      $SPtrans4[ushr($u, 16) & 0x3f] |
	      $SPtrans6[ushr($u, 24) & 0x3f];

	return $L;
}

sub body # int [] body(int schedule[], int Eswap0, int Eswap1)
{
	my ($schedule, $Eswap0, $Eswap1) = @_;
	my $left  = 0;
	my $right = 0;
	my $t     = 0;

	my ($i, $j);
	for($j = 0; $j < 25; $j++)
	{
		for($i = 0; $i < $ITERATIONS * 2; $i += 4)
		{
			$left  = D_ENCRYPT($left,  $right, $i,     $Eswap0, $Eswap1, $schedule);
			$right = D_ENCRYPT($right, $left,  $i + 2, $Eswap0, $Eswap1, $schedule);
		}
		$t     = $left; 
		$left  = $right; 
		$right = $t;
	}

	$t = $right;

	$right = ushr($left, 1) | ($left << 31);
	$left  = ushr($t   , 1) | ($t    << 31);

	$left  &= 0xffffffff;
	$right &= 0xffffffff;

	my @results; $#results = 1;

	PERM_OP($right, $left, 1, 0x55555555, \@results); 
	$right = $results[0]; $left = $results[1];

	PERM_OP($left, $right, 8, 0x00ff00ff, \@results); 
	$left = $results[0]; $right = $results[1];

	PERM_OP($right, $left, 2, 0x33333333, \@results); 
	$right = $results[0]; $left = $results[1];

	PERM_OP($left, $right, 16, 0x0000ffff, \@results);
	$left = $results[0]; $right = $results[1];

	PERM_OP($right, $left, 4, 0x0f0f0f0f, \@results);
	$right = $results[0]; $left = $results[1];

	my @out; $#out = 1;

	$out[0] = $left; $out[1] = $right;

	return \@out;
}

sub crypt # String crypt(String original, String salt)
{
	my ($original, $salt) = @_;

	while(length($salt) < 2)
	{
		$salt .= 'A';
	}

	my $buffer = '';

	substr($buffer,0,2) = substr($salt,0,2);

	my $Eswap0 = $con_salt[ord(substr($salt,0,1))];
	my $Eswap1 = $con_salt[ord(substr($salt,1,1))] << 4;
 
	my @key; $#key = 7;

	for(0 .. @key)
	{
		$key[$_] = 0;
	}

	my $i;
	my @iChar = map { ord($_) << 1 } split(//, $original);
	for($i = 0; $i < @key && $i < @iChar; $i++)
	{
		$key[$i] = toByte($iChar[$i]);
	}

	my $schedule = des_set_key(\@key);
	my $out      = body($schedule, $Eswap0, $Eswap1);

	my @b; $#b = 8;

	intToFourBytes($out->[0], \@b, 0);
	intToFourBytes($out->[1], \@b, 4);
	$b[8] = 0;

	my ($j, $c, $y, $u);
	for($i = 2, $y = 0, $u = 0x80; $i < 13; $i++)
	{
		for($j = 0, $c = 0; $j < 6; $j++)
		{
			$c <<= 1;

			$c |= 1 if (($b[$y] & $u) != 0);

			$u >>= 1;

			if($u == 0)
			{
				$y++;
				$u = 0x80;
			}
		}
		$buffer .= chr($cov_2char[$c]);
	}

	return $buffer;
}

1;