text: if (typeof Crypto == "undefined" || ! Crypto.util)
  {
  (function(){
  
  var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
  
  // Global Crypto object
  // with browser window or with node module
  var Crypto = (typeof window === 'undefined') ? exports.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) {
  
  		// Use browser-native function if it exists
  		if (typeof btoa == "function") return btoa(Binary.bytesToString(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) {
  
  		// Use browser-native function if it exists
  		if (typeof atob == "function") return Binary.stringToBytes(atob(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("");
  	}
  
  };
  
  })();
  }
  