two-way string encrypt/decrypt in php

@solavarApr 21.2004 — #have a look at the [B]mcrypt()[/B]

@crh3675Apr 21.2004 — #If you don't have mcrtypt installed, you can always use RC4 encryption

class.rc4crypt.php

<i>
 </i>&lt;?
 
 class rc4{
 
 <i>	</i>function rc4(){
 <i>	</i>}
 
 <i>	</i>function encrypt($pwd="",$data,$case=""){ 
 <i>	</i>	$data=$case == 'de' ? $data = urldecode($data) : $data;
 <i>	</i>	$v[] = "";$b[] = "";$s = "";$t = ""; $k = "";$f = "";$z = "";$l = 0;$x = 0;$a = 0;$j = 0;$l = strlen($pwd);$d=strlen($data);
 <i>	</i>	for ($i = 0; $i &lt;= 255; $i++){$v[$i] = ord(substr($pwd, ($i % $l), 1)); $b[$i] = $i;}
 <i>	</i>	for ($i = 0; $i &lt;= 255; $i++){$x = ($x + $b[$i] + $v[$i]) % 256; $s = $b[$i]; $b[$i] = $b[$x]; $b[$x] = $s; }
 <i>	</i>	for ($i = 0; $i &lt; $d; $i++)  {$a = ($a + 1) % 256; $j = ($j + $b[$a]) % 256;$t = $b[$a]; $b[$a] = $b[$j];$b[$j] = $t;$k = $b[(($b[$a] + $b[$j]) % 256)]; $f = ord(substr($data, $i, 1)) ^ $k;$z .= chr($f);}
 <i>	</i>	$z=$case =="de" ? urldecode(urlencode($z)): $z; 
 <i>	</i>	return $z;
 <i>	</i>}
 
 <i>	</i>function decrypt($pwd,$data){
 <i>	</i>		return $this-&gt;encrypt($pwd,urlencode($data),"de");
 <i>	</i>} 
 
 }
 
 ?&gt;

rc4test.php

<i>
 </i>&lt;?php
 
 include("class.rc4crypt.php");
 
 $enc=new rc4();
 
 $pass="mypassword";
 $mystring="this is the string I am encrypting";
 
 print "From:&lt;br&gt;";
 
 print $mystring;
 
 print "&lt;br&gt;&lt;br&gt;";
 
 $encrypted_string=$enc-&gt;encrypt($mypassword,$mystring);
 
 print "To:&lt;br&gt;";
 
 print $encrypted_string;
 
 print "&lt;br&gt;&lt;br&gt;"; 
 
 $decrypted_string=$enc-&gt;decrypt($mypassword,$encrypted_string);
 
 print "And Back:&lt;br&gt;";
 
 print $decrypted_string;
 ?&gt;

@solavarApr 21.2004 — #[i]Originally posted by crh3675 [/i]

[B]If you don't have mcrtypt installed, you can always use RC4 encryption

[/code] [/B][/QUOTE]

...thanks, been looking for something like this

two-way string encrypt/decrypt in php

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