110 lines
3.3 KiB
JavaScript
110 lines
3.3 KiB
JavaScript
/*
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CryptoJS v3.1.2
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code.google.com/p/crypto-js
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(c) 2009-2013 by Jeff Mott. All rights reserved.
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code.google.com/p/crypto-js/wiki/License
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*/
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(function () {
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// Shortcuts
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var C = CryptoJS;
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var C_lib = C.lib;
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var WordArray = C_lib.WordArray;
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var C_enc = C.enc;
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/**
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* Base64 encoding strategy.
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*/
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var Base64 = C_enc.Base64 = {
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/**
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* Converts a word array to a Base64 string.
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*
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* @param {WordArray} wordArray The word array.
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*
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* @return {string} The Base64 string.
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*
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* @static
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*
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* @example
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*
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* var base64String = CryptoJS.enc.Base64.stringify(wordArray);
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*/
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stringify: function (wordArray) {
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// Shortcuts
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var words = wordArray.words;
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var sigBytes = wordArray.sigBytes;
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var map = this._map;
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// Clamp excess bits
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wordArray.clamp();
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// Convert
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var base64Chars = [];
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for (var i = 0; i < sigBytes; i += 3) {
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var byte1 = (words[i >>> 2] >>> (24 - (i % 4) * 8)) & 0xff;
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var byte2 = (words[(i + 1) >>> 2] >>> (24 - ((i + 1) % 4) * 8)) & 0xff;
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var byte3 = (words[(i + 2) >>> 2] >>> (24 - ((i + 2) % 4) * 8)) & 0xff;
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var triplet = (byte1 << 16) | (byte2 << 8) | byte3;
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for (var j = 0; (j < 4) && (i + j * 0.75 < sigBytes); j++) {
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base64Chars.push(map.charAt((triplet >>> (6 * (3 - j))) & 0x3f));
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}
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}
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// Add padding
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var paddingChar = map.charAt(64);
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if (paddingChar) {
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while (base64Chars.length % 4) {
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base64Chars.push(paddingChar);
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}
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}
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return base64Chars.join('');
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},
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/**
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* Converts a Base64 string to a word array.
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*
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* @param {string} base64Str The Base64 string.
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*
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* @return {WordArray} The word array.
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*
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* @static
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*
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* @example
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*
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* var wordArray = CryptoJS.enc.Base64.parse(base64String);
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*/
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parse: function (base64Str) {
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// Shortcuts
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var base64StrLength = base64Str.length;
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var map = this._map;
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// Ignore padding
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var paddingChar = map.charAt(64);
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if (paddingChar) {
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var paddingIndex = base64Str.indexOf(paddingChar);
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if (paddingIndex != -1) {
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base64StrLength = paddingIndex;
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}
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}
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// Convert
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var words = [];
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var nBytes = 0;
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for (var i = 0; i < base64StrLength; i++) {
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if (i % 4) {
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var bits1 = map.indexOf(base64Str.charAt(i - 1)) << ((i % 4) * 2);
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var bits2 = map.indexOf(base64Str.charAt(i)) >>> (6 - (i % 4) * 2);
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words[nBytes >>> 2] |= (bits1 | bits2) << (24 - (nBytes % 4) * 8);
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nBytes++;
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}
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}
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return WordArray.create(words, nBytes);
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},
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_map: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/='
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};
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}());
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