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/*
* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1
*
* The contents of this file are subject to the Mozilla Public
* License Version 1.1 ("License"); you may not use this file except in
* compliance with the License. You may obtain a copy of the License at
* http://www.zimbra.com/license
*
* Software distributed under the License is distributed on an "AS IS"
* basis, WITHOUT WARRANTY OF ANY KIND, either express or implied. See
* the License for the specific language governing rights and limitations
* under the License.
*
* The Original Code is: Zimbra AJAX Toolkit.
*
* The Initial Developer of the Original Code is Zimbra, Inc.
* Portions created by Zimbra are Copyright (C) 2005 Zimbra, Inc.
* All Rights Reserved.
*
* Contributor(s):
*
* ***** END LICENSE BLOCK *****
*/


/*
 * Based on code by Paul Johnston:
 *
 * A JavaScript implementation of the RSA Data Security, Inc. MD5 Message
 * Digest Algorithm, as defined in RFC 1321.
 * Version 2.1 Copyright (C) Paul Johnston 1999 - 2002.
 * Other contributors: Greg Holt, Andrew Kepert, Ydnar, Lostinet
 * Distributed under the BSD License
 * See http://pajhome.org.uk/crypt/md5 for more info.
 */

// Namespace for common functions
// Members are initialized at the end of this file
// Do NOT instantiate.  Call class members like this:
//
//    var md5_hash = AjxMD5.hex_md5('foo bar');
//
// See the available methods at EOF (look for "this").
var AjxMD5 = function() {

/*
 * Configurable variables. You may need to tweak these to be compatible with
 * the server-side, but the defaults work in most cases.
 */
	var hexcase = 0;  /* hex output format. 0 - lowercase; 1 - uppercase        */
	var b64pad  = ""; /* base-64 pad character. "=" for strict RFC compliance   */
	var chrsz   = 8;  /* bits per input character. 8 - ASCII; 16 - Unicode      */

/*
 * Add integers, wrapping at 2^32.  Uses 16-bit operations internally
 * to work around bugs in some JS interpreters.
 */
	function safe_add(x, y) {
		var lsw = (x & 0xFFFF) + (y & 0xFFFF);
		var msw = (x >> 16) + (y >> 16) + (lsw >> 16);
		return (msw << 16) | (lsw & 0xFFFF);
	};

/*
 * Bitwise rotate a 32-bit number to the left.
 */
	function bit_rol(num, cnt) {
		return (num << cnt) | (num >>> (32 - cnt));
	};

/*
 * These functions implement the four basic operations the algorithm uses.
 */
	function md5_cmn(q, a, b, x, s, t) {
		return safe_add(bit_rol(safe_add(safe_add(a, q), safe_add(x, t)), s),b);
	};

	function md5_ff(a, b, c, d, x, s, t) {
		return md5_cmn((b & c) | ((~b) & d), a, b, x, s, t);
	};

	function md5_gg(a, b, c, d, x, s, t) {
		return md5_cmn((b & d) | (c & (~d)), a, b, x, s, t);
	};

	function md5_hh(a, b, c, d, x, s, t) {
		return md5_cmn(b ^ c ^ d, a, b, x, s, t);
	};

	function md5_ii(a, b, c, d, x, s, t) {
		return md5_cmn(c ^ (b | (~d)), a, b, x, s, t);
	};

/*
 * Calculate the MD5 of an array of little-endian words, and a bit length
 */
	function core_md5(x, len) {
		/* append padding */
		x[len >> 5] |= 0x80 << ((len) % 32);
		x[(((len + 64) >>> 9) << 4) + 14] = len;

		var a =  1732584193;
		var b = -271733879;
		var c = -1732584194;
		var d =  271733878;

		for (var i = 0; i < x.length; i += 16) {
			var olda = a;
			var oldb = b;
			var oldc = c;
			var oldd = d;

			a = md5_ff(a, b, c, d, x[i+ 0], 7 , -680876936);
			d = md5_ff(d, a, b, c, x[i+ 1], 12, -389564586);
			c = md5_ff(c, d, a, b, x[i+ 2], 17,  606105819);
			b = md5_ff(b, c, d, a, x[i+ 3], 22, -1044525330);
			a = md5_ff(a, b, c, d, x[i+ 4], 7 , -176418897);
			d = md5_ff(d, a, b, c, x[i+ 5], 12,  1200080426);
			c = md5_ff(c, d, a, b, x[i+ 6], 17, -1473231341);
			b = md5_ff(b, c, d, a, x[i+ 7], 22, -45705983);
			a = md5_ff(a, b, c, d, x[i+ 8], 7 ,  1770035416);
			d = md5_ff(d, a, b, c, x[i+ 9], 12, -1958414417);
			c = md5_ff(c, d, a, b, x[i+10], 17, -42063);
			b = md5_ff(b, c, d, a, x[i+11], 22, -1990404162);
			a = md5_ff(a, b, c, d, x[i+12], 7 ,  1804603682);
			d = md5_ff(d, a, b, c, x[i+13], 12, -40341101);
			c = md5_ff(c, d, a, b, x[i+14], 17, -1502002290);
			b = md5_ff(b, c, d, a, x[i+15], 22,  1236535329);

			a = md5_gg(a, b, c, d, x[i+ 1], 5 , -165796510);
			d = md5_gg(d, a, b, c, x[i+ 6], 9 , -1069501632);
			c = md5_gg(c, d, a, b, x[i+11], 14,  643717713);
			b = md5_gg(b, c, d, a, x[i+ 0], 20, -373897302);
			a = md5_gg(a, b, c, d, x[i+ 5], 5 , -701558691);
			d = md5_gg(d, a, b, c, x[i+10], 9 ,  38016083);
			c = md5_gg(c, d, a, b, x[i+15], 14, -660478335);
			b = md5_gg(b, c, d, a, x[i+ 4], 20, -405537848);
			a = md5_gg(a, b, c, d, x[i+ 9], 5 ,  568446438);
			d = md5_gg(d, a, b, c, x[i+14], 9 , -1019803690);
			c = md5_gg(c, d, a, b, x[i+ 3], 14, -187363961);
			b = md5_gg(b, c, d, a, x[i+ 8], 20,  1163531501);
			a = md5_gg(a, b, c, d, x[i+13], 5 , -1444681467);
			d = md5_gg(d, a, b, c, x[i+ 2], 9 , -51403784);
			c = md5_gg(c, d, a, b, x[i+ 7], 14,  1735328473);
			b = md5_gg(b, c, d, a, x[i+12], 20, -1926607734);

			a = md5_hh(a, b, c, d, x[i+ 5], 4 , -378558);
			d = md5_hh(d, a, b, c, x[i+ 8], 11, -2022574463);
			c = md5_hh(c, d, a, b, x[i+11], 16,  1839030562);
			b = md5_hh(b, c, d, a, x[i+14], 23, -35309556);
			a = md5_hh(a, b, c, d, x[i+ 1], 4 , -1530992060);
			d = md5_hh(d, a, b, c, x[i+ 4], 11,  1272893353);
			c = md5_hh(c, d, a, b, x[i+ 7], 16, -155497632);
			b = md5_hh(b, c, d, a, x[i+10], 23, -1094730640);
			a = md5_hh(a, b, c, d, x[i+13], 4 ,  681279174);
			d = md5_hh(d, a, b, c, x[i+ 0], 11, -358537222);
			c = md5_hh(c, d, a, b, x[i+ 3], 16, -722521979);
			b = md5_hh(b, c, d, a, x[i+ 6], 23,  76029189);
			a = md5_hh(a, b, c, d, x[i+ 9], 4 , -640364487);
			d = md5_hh(d, a, b, c, x[i+12], 11, -421815835);
			c = md5_hh(c, d, a, b, x[i+15], 16,  530742520);
			b = md5_hh(b, c, d, a, x[i+ 2], 23, -995338651);

			a = md5_ii(a, b, c, d, x[i+ 0], 6 , -198630844);
			d = md5_ii(d, a, b, c, x[i+ 7], 10,  1126891415);
			c = md5_ii(c, d, a, b, x[i+14], 15, -1416354905);
			b = md5_ii(b, c, d, a, x[i+ 5], 21, -57434055);
			a = md5_ii(a, b, c, d, x[i+12], 6 ,  1700485571);
			d = md5_ii(d, a, b, c, x[i+ 3], 10, -1894986606);
			c = md5_ii(c, d, a, b, x[i+10], 15, -1051523);
			b = md5_ii(b, c, d, a, x[i+ 1], 21, -2054922799);
			a = md5_ii(a, b, c, d, x[i+ 8], 6 ,  1873313359);
			d = md5_ii(d, a, b, c, x[i+15], 10, -30611744);
			c = md5_ii(c, d, a, b, x[i+ 6], 15, -1560198380);
			b = md5_ii(b, c, d, a, x[i+13], 21,  1309151649);
			a = md5_ii(a, b, c, d, x[i+ 4], 6 , -145523070);
			d = md5_ii(d, a, b, c, x[i+11], 10, -1120210379);
			c = md5_ii(c, d, a, b, x[i+ 2], 15,  718787259);
			b = md5_ii(b, c, d, a, x[i+ 9], 21, -343485551);

			a = safe_add(a, olda);
			b = safe_add(b, oldb);
			c = safe_add(c, oldc);
			d = safe_add(d, oldd);
		}
		return Array(a, b, c, d);
	};

/*
 * Convert a string to an array of little-endian words
 * If chrsz is ASCII, characters >255 have their hi-byte silently ignored.
 */
	function str2binl(str) {
		var bin = Array();
		var mask = (1 << chrsz) - 1;
		for (var i = 0; i < str.length * chrsz; i += chrsz)
			bin[i>>5] |= (str.charCodeAt(i / chrsz) & mask) << (i%32);
		return bin;
	};

/*
 * Calculate the HMAC-MD5, of a key and some data
 */
	function core_hmac_md5(key, data) {
		var bkey = str2binl(key);
		if(bkey.length > 16) bkey = core_md5(bkey, key.length * chrsz);

		var ipad = Array(16), opad = Array(16);
		for (var i = 0; i < 16; i++) {
			ipad[i] = bkey[i] ^ 0x36363636;
			opad[i] = bkey[i] ^ 0x5C5C5C5C;
		}

		var hash = core_md5(ipad.concat(str2binl(data)), 512 + data.length * chrsz);
		return core_md5(opad.concat(hash), 512 + 128);
	};

/*
 * Convert an array of little-endian words to a string
 */
	function binl2str(bin) {
		var str = "";
		var mask = (1 << chrsz) - 1;
		for (var i = 0; i < bin.length * 32; i += chrsz)
			str += String.fromCharCode((bin[i>>5] >>> (i % 32)) & mask);
		return str;
	};

/*
 * Convert an array of little-endian words to a hex string.
 */
	function binl2hex(binarray) {
		var hex_tab = hexcase ? "0123456789ABCDEF" : "0123456789abcdef";
		var str = "";
		for (var i = 0; i < binarray.length * 4; i++) {
			str += hex_tab.charAt((binarray[i>>2] >> ((i%4)*8+4)) & 0xF) +
				hex_tab.charAt((binarray[i>>2] >> ((i%4)*8  )) & 0xF);
		}
		return str;
	};

/*
 * Convert an array of little-endian words to a base-64 string
 */
	function binl2b64(binarray) {
		var tab = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
		var str = "";
		for (var i = 0; i < binarray.length * 4; i += 3) {
			var triplet = (((binarray[i   >> 2] >> 8 * ( i   %4)) & 0xFF) << 16)
				| (((binarray[i+1 >> 2] >> 8 * ((i+1)%4)) & 0xFF) << 8 )
				|  ((binarray[i+2 >> 2] >> 8 * ((i+2)%4)) & 0xFF);
			for (var j = 0; j < 4; j++) {
				if(i * 8 + j * 6 > binarray.length * 32) str += b64pad;
				else str += tab.charAt((triplet >> 6*(3-j)) & 0x3F);
			}
		}
		return str;
	};

/*
 * These are the functions you'll usually want to call
 * They take string arguments and return either hex or base-64 encoded strings
 */
	function hex_md5(s) { return binl2hex(core_md5(str2binl(s), s.length * chrsz)); };
	function b64_md5(s) { return binl2b64(core_md5(str2binl(s), s.length * chrsz)); };
	function str_md5(s) { return binl2str(core_md5(str2binl(s), s.length * chrsz)); };
	function hex_hmac_md5(key, data) { return binl2hex(core_hmac_md5(key, data)); };
	function b64_hmac_md5(key, data) { return binl2b64(core_hmac_md5(key, data)); };
	function str_hmac_md5(key, data) { return binl2str(core_hmac_md5(key, data)); };

/*
 * Perform a simple self-test to see if the VM is working
 */
	function md5_vm_test() {
		return hex_md5("abc") == "900150983cd24fb0d6963f7d28e17f72";
	};

	// initialize global stuff
	this.hex_md5 = hex_md5;
	this.b64_md5 = b64_md5;
	this.str_md5 = str_md5;
	this.hex_hmac = hex_hmac_md5;
	this.b64_hmac = b64_hmac_md5;
	this.str_hmac = str_hmac_md5;
	this.md5_vm_test = md5_vm_test;
};

AjxMD5 = new AjxMD5;