adodb-encrypt-sha1.php

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<?php

/*
V4.65 22 July 2005  (c) 2000-2005 John Lim ([e-mail]). All rights reserved.
         Contributed by Ross Smith ([e-mail]). 
  Released under both BSD license and Lesser GPL library license.
  Whenever there is any discrepancy between the two licenses,
  the BSD license will take precedence.
	  Set tabs to 4 for best viewing.

*/

// security - hide paths
if (!defined('ADODB_SESSION')) die();

class SHA1Crypt{
	function keyED($txt,$encrypt_key)
	{
		$encrypt_key = sha1($encrypt_key);
		$ctr=0;
		$tmp = "";
		for ($i=0;$i<strlen($txt);$i++){
			if ($ctr==strlen($encrypt_key)) $ctr=0;
			$tmp.= substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1);
			$ctr++;
		}
		return $tmp;
	}

	function Encrypt($txt,$key)
	{
		srand((double)microtime()*1000000);
		$encrypt_key = sha1(rand(0,32000));
		$ctr=0;
		$tmp = "";
		for ($i=0;$i<strlen($txt);$i++)
		{
			if ($ctr==strlen($encrypt_key)) $ctr=0;
			$tmp.= substr($encrypt_key,$ctr,1) . (substr($txt,$i,1) ^ substr($encrypt_key,$ctr,1));
			$ctr++;
		}
		return base64_encode($this->keyED($tmp,$key));
	}

	function Decrypt($txt,$key)
	{
		$txt = $this->keyED(base64_decode($txt),$key);
		$tmp = "";
		for ($i=0;$i<strlen($txt);$i++){
			$sha1 = substr($txt,$i,1);
			$i++;
			$tmp.= (substr($txt,$i,1) ^ $sha1);
		}
		return $tmp;
	}

	function RandPass()
	{
		$randomPassword = "";
		srand((double)microtime()*1000000);
		for($i=0;$i<8;$i++)
		{
			$randnumber = rand(48,120);
			while (($randnumber >= 58 && $randnumber <= 64) || ($randnumber >= 91 && $randnumber <= 96))
			{
				$randnumber = rand(48,120);
			}
			$randomPassword .= chr($randnumber);
		}
		return $randomPassword;
	}
}

class ADODB_Encrypt_SHA1 {

	function write($data, $key) {
		$sha1crypt =& new SHA1Crypt();
		return $sha1crypt->encrypt($data, $key);
	}

	function read($data, $key) {
		$sha1crypt =& new SHA1Crypt();
		return $sha1crypt->decrypt($data, $key);
	}
}

return 1;
?>