140 lines
4.3 KiB
JavaScript
140 lines
4.3 KiB
JavaScript
;(function (root, factory) {
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if (typeof exports === "object") {
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// CommonJS
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module.exports = exports = factory(require("./core"));
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}
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else if (typeof define === "function" && define.amd) {
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// AMD
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define(["./core"], factory);
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}
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else {
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// Global (browser)
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factory(root.CryptoJS);
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}
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}(this, function (CryptoJS) {
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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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* Base64url encoding strategy.
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*/
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var Base64url = C_enc.Base64url = {
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/**
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* Converts a word array to a Base64url string.
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*
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* @param {WordArray} wordArray The word array.
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*
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* @param {boolean} urlSafe Whether to use url safe
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*
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* @return {string} The Base64url 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.Base64url.stringify(wordArray);
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*/
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stringify: function (wordArray, urlSafe=true) {
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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 = urlSafe ? this._safe_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 Base64url string to a word array.
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*
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* @param {string} base64Str The Base64url string.
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*
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* @param {boolean} urlSafe Whether to use url safe
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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.Base64url.parse(base64String);
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*/
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parse: function (base64Str, urlSafe=true) {
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// Shortcuts
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var base64StrLength = base64Str.length;
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var map = urlSafe ? this._safe_map : this._map;
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var reverseMap = this._reverseMap;
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if (!reverseMap) {
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reverseMap = this._reverseMap = [];
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for (var j = 0; j < map.length; j++) {
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reverseMap[map.charCodeAt(j)] = j;
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}
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}
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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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return parseLoop(base64Str, base64StrLength, reverseMap);
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},
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_map: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789+/=',
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_safe_map: 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789-_',
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};
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function parseLoop(base64Str, base64StrLength, reverseMap) {
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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 = reverseMap[base64Str.charCodeAt(i - 1)] << ((i % 4) * 2);
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var bits2 = reverseMap[base64Str.charCodeAt(i)] >>> (6 - (i % 4) * 2);
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var bitsCombined = bits1 | bits2;
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words[nBytes >>> 2] |= bitsCombined << (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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}());
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return CryptoJS.enc.Base64url;
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})); |