/***  DOCUMENTATION LAYER

	mushpup Implementation of SHA-1 Algorithm

	File: mushpup_algorithm.js
	Last Update: Jul 2006
	Author: Tom Atwell (klenwell@gmail.com)
	License: New BSD (details below)

	FUNCTIONS:
	
		mushpup_sha24(str)


  NOTES:
	
		Depends on javascript implementation of SHA-1 function.  Copy available
		at obtained http://pajhome.org.uk.
		
		This code released under the terms of the new BSD license.
	
		To link: <script type="text/javascript" src="path/to/file.js"></script>

______________________________________________________________________________*/



// mushpup_sha24
/* a slightly modified version of Sha-1 Hashing Function that returns a 24-char alphanumeric hash */
/*____________________________________________________________________________*/
function mushpup_sha24(str)
{
	// *** DATA
	
		// Internal
		hash_b64 = '';
		hash_b64t = '';
		hash_b64tl = '';
		
		// Return
		hash = '';
		
			
	// *** MANIPULATE
	
		// Get Base-64 Hash
		hash_b64 = b64_sha1(str);
		
		// Replace + with t
		hash_b64t = hash_b64.replace(/\+/g, 't');
		
		// Replace / with l
		hash_b64tl = hash_b64t.replace(/\//g, 'l');
		
		// Truncate at 24 characters
		hash = hash_b64tl.substr(0,24);
	
	// *** RETURN
	
		return hash;	


} // end Fx
/*____________________________________________________________________________*/


/***  LICENSE (http://www.opensource.org/licenses/bsd-license.php)

	Copyright (c) 2006, Tom Atwell (klenwell@gmail.com)
	Wired Jaw Technologies (http://www.wiredjawtech.com/)
	All rights reserved.

	Redistribution and use in source and binary forms, with or without modification, 
	are permitted provided that the following conditions are met:

    * Redistributions of source code must retain the above copyright notice, 
			this list of conditions and the following disclaimer.
			
    * Redistributions in binary form must reproduce the above copyright notice, 
			this list of conditions and the following disclaimer in the documentation 
			and/or other materials provided with the distribution.
			
    * Neither the name of Wired Jaw Technologies nor the names of its contributors 
			may be used to endorse or promote products derived from this software without 
			specific prior written permission.

	THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND 
	ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 
	WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 
	IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 
	INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 
	BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 
	DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF 
	LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE 
	OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 
	OF THE POSSIBILITY OF SUCH DAMAGE.
______________________________________________________________________________*/