/*!
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* Crypto-JS v1.1.0
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* http://code.google.com/p/crypto-js/
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* Copyright (c) 2009, Jeff Mott. All rights reserved.
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* http://code.google.com/p/crypto-js/wiki/License
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*/
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(function(){
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var base64map = "ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/";
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// Global Crypto object
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window.Crypto = {};
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// Crypto utilities
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var util = Crypto.util = {
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// Bit-wise rotate left
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rotl: function (n, b) {
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return (n << b) | (n >>> (32 - b));
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},
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// Bit-wise rotate right
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rotr: function (n, b) {
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return (n << (32 - b)) | (n >>> b);
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},
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// Swap big-endian to little-endian and vice versa
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endian: function (n) {
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// If number given, swap endian
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if (n.constructor == Number) {
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return util.rotl(n, 8) & 0x00FF00FF |
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util.rotl(n, 24) & 0xFF00FF00;
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}
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// Else, assume array and swap all items
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for (var i = 0; i < n.length; i++)
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n[i] = util.endian(n[i]);
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return n;
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},
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// Generate an array of any length of random bytes
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randomBytes: function (n) {
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for (var bytes = []; n > 0; n--)
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bytes.push(Math.floor(Math.random() * 256));
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return bytes;
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},
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// Convert a string to a byte array
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stringToBytes: function (str) {
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var bytes = [];
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for (var i = 0; i < str.length; i++)
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bytes.push(str.charCodeAt(i));
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return bytes;
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},
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// Convert a byte array to a string
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bytesToString: function (bytes) {
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var str = [];
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for (var i = 0; i < bytes.length; i++)
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str.push(String.fromCharCode(bytes[i]));
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return str.join("");
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},
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// Convert a string to big-endian 32-bit words
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stringToWords: function (str) {
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var words = [];
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for (var c = 0, b = 0; c < str.length; c++, b += 8)
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words[b >>> 5] |= str.charCodeAt(c) << (24 - b % 32);
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return words;
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},
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// Convert a byte array to big-endian 32-bits words
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bytesToWords: function (bytes) {
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var words = [];
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for (var i = 0, b = 0; i < bytes.length; i++, b += 8)
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words[b >>> 5] |= bytes[i] << (24 - b % 32);
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return words;
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},
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// Convert big-endian 32-bit words to a byte array
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wordsToBytes: function (words) {
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var bytes = [];
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for (var b = 0; b < words.length * 32; b += 8)
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bytes.push((words[b >>> 5] >>> (24 - b % 32)) & 0xFF);
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return bytes;
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},
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// Convert a byte array to a hex string
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bytesToHex: function (bytes) {
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var hex = [];
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for (var i = 0; i < bytes.length; i++) {
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hex.push((bytes[i] >>> 4).toString(16));
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hex.push((bytes[i] & 0xF).toString(16));
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}
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return hex.join("");
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},
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// Convert a hex string to a byte array
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hexToBytes: function (hex) {
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var bytes = [];
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for (var c = 0; c < hex.length; c += 2)
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bytes.push(parseInt(hex.substr(c, 2), 16));
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return bytes;
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},
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// Convert a byte array to a base-64 string
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bytesToBase64: function (bytes) {
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// Use browser-native function if it exists
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if (typeof btoa == "function") return btoa(util.bytesToString(bytes));
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var base64 = [],
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overflow;
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for (var i = 0; i < bytes.length; i++) {
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switch (i % 3) {
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case 0:
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base64.push(base64map.charAt(bytes[i] >>> 2));
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overflow = (bytes[i] & 0x3) << 4;
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break;
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case 1:
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base64.push(base64map.charAt(overflow | (bytes[i] >>> 4)));
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overflow = (bytes[i] & 0xF) << 2;
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break;
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case 2:
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base64.push(base64map.charAt(overflow | (bytes[i] >>> 6)));
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base64.push(base64map.charAt(bytes[i] & 0x3F));
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overflow = -1;
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}
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}
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// Encode overflow bits, if there are any
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if (overflow != undefined && overflow != -1)
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base64.push(base64map.charAt(overflow));
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// Add padding
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while (base64.length % 4 != 0) base64.push("=");
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return base64.join("");
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},
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// Convert a base-64 string to a byte array
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base64ToBytes: function (base64) {
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// Use browser-native function if it exists
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if (typeof atob == "function") return util.stringToBytes(atob(base64));
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// Remove non-base-64 characters
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base64 = base64.replace(/[^A-Z0-9+\/]/ig, "");
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var bytes = [];
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for (var i = 0; i < base64.length; i++) {
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switch (i % 4) {
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case 1:
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bytes.push((base64map.indexOf(base64.charAt(i - 1)) << 2) |
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(base64map.indexOf(base64.charAt(i)) >>> 4));
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break;
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case 2:
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bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0xF) << 4) |
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(base64map.indexOf(base64.charAt(i)) >>> 2));
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break;
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case 3:
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bytes.push(((base64map.indexOf(base64.charAt(i - 1)) & 0x3) << 6) |
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(base64map.indexOf(base64.charAt(i))));
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break;
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}
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}
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return bytes;
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}
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};
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// Crypto mode namespace
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Crypto.mode = {};
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})();
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