cryptojs.js

/*!
* Crypto-JS v2.5.4	Crypto.js
* http://code.google.com/p/crypto-js/
* Copyright (c) 2009-2013, Jeff Mott. All rights reserved.
* http://code.google.com/p/crypto-js/wiki/License
*/
if (typeof Crypto == "undefined" || !Crypto.util) {
	(function () {

		var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";

		// Global Crypto object
		var Crypto = window.Crypto = {};

		// Crypto utilities
		var util = Crypto.util = {

			// Bit-wise rotate left
			rotl: function (n, b) {
				return (n << b) | (n >>> (32 - b));
			},

			// Bit-wise rotate right
			rotr: function (n, b) {
				return (n << (32 - b)) | (n >>> b);
			},

			// Swap big-endian to little-endian and vice versa
			endian: function (n) {

				// If number given, swap endian
				if (n.constructor == Number) {
					return util.rotl(n, 8) & 0x00FF00FF |
			    util.rotl(n, 24) & 0xFF00FF00;
				}

				// Else, assume array and swap all items
				for (var i = 0; i < n.length; i++)
					n[i] = util.endian(n[i]);
				return n;

			},

			// Generate an array of any length of random bytes
			randomBytes: function (n) {
				for (var bytes = []; n > 0; n--)
					bytes.push(Math.floor(Math.random() * 256));
				return bytes;
			},

			// Convert a byte array to big-endian 32-bit words
			bytesToWords: function (bytes) {
				for (var words = [], i = 0, b = 0; i < bytes.length; i++, b += 8)
					words[b >>> 5] |= (bytes[i] & 0xFF) << (24 - b % 32);
				return words;
			},

			// Convert big-endian 32-bit words to a byte array
			wordsToBytes: function (words) {
				for (var bytes = [], b = 0; b < words.length * 32; b += 8)
					bytes.push((words[b >>> 5] >>> (24 - b % 32)) & 0xFF);
				return bytes;
			},

			// Convert a byte array to a hex string
			bytesToHex: function (bytes) {
				for (var hex = [], i = 0; i < bytes.length; i++) {
					hex.push((bytes[i] >>> 4).toString(16));
					hex.push((bytes[i] & 0xF).toString(16));
				}
				return hex.join("");
			},

			// Convert a hex string to a byte array
			hexToBytes: function (hex) {
				for (var bytes = [], c = 0; c < hex.length; c += 2)
					bytes.push(parseInt(hex.substr(c, 2), 16));
				return bytes;
			},

			// Convert a byte array to a base-64 string
			bytesToBase64: function (bytes) {
				for (var base64 = [], i = 0; i < bytes.length; i += 3) {
					var triplet = (bytes[i] << 16) | (bytes[i + 1] << 8) | bytes[i + 2];
					for (var j = 0; j < 4; j++) {
						if (i * 8 + j * 6 <= bytes.length * 8)
							base64.push(base64map.charAt((triplet >>> 6 * (3 - j)) & 0x3F));
						else base64.push("=");
					}
				}

				return base64.join("");
			},

			// Convert a base-64 string to a byte array
			base64ToBytes: function (base64) {
				// Remove non-base-64 characters
				base64 = base64.replace(/[^A-Z0-9+\/]/ig, "");

				for (var bytes = [], i = 0, imod4 = 0; i < base64.length; imod4 = ++i % 4) {
					if (imod4 == 0) continue;
					bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & (Math.pow(2, -2 * imod4 + 8) - 1)) << (imod4 * 2)) |
			        (base64map.indexOf(base64.charAt(i)) >>> (6 - imod4 * 2)));
				}

				return bytes;
			}

		};

		// Crypto character encodings
		var charenc = Crypto.charenc = {};

		// UTF-8 encoding
		var UTF8 = charenc.UTF8 = {

			// Convert a string to a byte array
			stringToBytes: function (str) {
				return Binary.stringToBytes(unescape(encodeURIComponent(str)));
			},

			// Convert a byte array to a string
			bytesToString: function (bytes) {
				return decodeURIComponent(escape(Binary.bytesToString(bytes)));
			}

		};

		// Binary encoding
		var Binary = charenc.Binary = {

			// Convert a string to a byte array
			stringToBytes: function (str) {
				for (var bytes = [], i = 0; i < str.length; i++)
					bytes.push(str.charCodeAt(i) & 0xFF);
				return bytes;
			},

			// Convert a byte array to a string
			bytesToString: function (bytes) {
				for (var str = [], i = 0; i < bytes.length; i++)
					str.push(String.fromCharCode(bytes[i]));
				return str.join("");
			}

		};

	})();
}