CFLib.org – Common Function Library Project

Description:
This is actually two functions. The first urlEncrypt("name=value&name=value&name=value",key) you use when you would have a link or an action that you would be setting url variables in. The second urlDecrypt(key) you use on whatever page you are calling, or using as the form action page.

Return Values:
Returns an encrypted query string.

Example:

<CFSET Name = "Ray">
<CFSET Age = 28>
<CFSET Key = "MySecretBlah348123190">
<CFSET QS = "name=#Name#&age=#Age#">
<CFOUTPUT>
Link will be, foo.cfm#URLEncrypt(QS,key)#
</CFOUTPUT>

Parameters:

Full UDF Source:

<cfscript>
/**
 * Add security by encrypting and decrypting URL variables.
 * 
 * @param cQueryString 	 Query string to encrypt. (Required)
 * @param nKey 	 Key to use for encryption. (Required)
 * @return Returns an encrypted query string. 
 * @author Timothy Heald (&#116;&#104;&#101;&#97;&#108;&#100;&#64;&#115;&#99;&#104;&#111;&#111;&#108;&#108;&#105;&#110;&#107;&#46;&#110;&#101;&#116;) 
 * @version 2, February 19, 2003 
 */
function urlEncrypt(queryString, key){
	// encode the string
	var uue = cfusion_encrypt(queryString, key);
        
	// make a checksum of the endoed string
	var checksum = left(hash(uue & key),2);
        
	// assemble the URL
	queryString = "/" & uue & checksum &"/index.htm";
		
	return queryString;
}
</cfscript>