Build CryptoJS components into webcrypto.js
We only depend on cryptojs for this webcrypto polyfill, so let Grunt concatenate them into one file. The reference in the getString helper isn't needed since we use the built in string converters on CryptoJS's word arrays.pull/749/head
lilia
10 years ago
parent
4518d03f43
commit
e190582d9e
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/*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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;(function() {
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'use strict';
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// Test for webcrypto support, polyfill if needed.
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if (window.crypto.subtle === undefined || window.crypto.subtle === null) {
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window.crypto.subtle = (function () {
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var StaticArrayBufferProto = new ArrayBuffer().__proto__;
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function assertIsArrayBuffer(thing) {
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if (thing !== Object(thing) || thing.__proto__ != StaticArrayBufferProto)
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throw new Error("Needed a ArrayBuffer");
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}
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// Synchronous implementation functions for polyfilling webcrypto
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// All inputs/outputs are arraybuffers!
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function HmacSHA256(key, input) {
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assertIsArrayBuffer(key);
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assertIsArrayBuffer(input);
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return CryptoJS.HmacSHA256(
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CryptoJS.enc.Latin1.parse(getString(input)),
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CryptoJS.enc.Latin1.parse(getString(key))
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).toString(CryptoJS.enc.Latin1);
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};
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function encryptAESCBC(plaintext, key, iv) {
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assertIsArrayBuffer(plaintext);
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assertIsArrayBuffer(key);
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assertIsArrayBuffer(iv);
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return CryptoJS.AES.encrypt(
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CryptoJS.enc.Latin1.parse(getString(plaintext)),
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CryptoJS.enc.Latin1.parse(getString(key)),
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{ iv: CryptoJS.enc.Latin1.parse(getString(iv)) }
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).ciphertext.toString(CryptoJS.enc.Latin1);
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};
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function decryptAESCBC(ciphertext, key, iv) {
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assertIsArrayBuffer(ciphertext);
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assertIsArrayBuffer(key);
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assertIsArrayBuffer(iv);
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return CryptoJS.AES.decrypt(
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btoa(getString(ciphertext)),
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CryptoJS.enc.Latin1.parse(getString(key)),
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{ iv: CryptoJS.enc.Latin1.parse(getString(iv)) }
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).toString(CryptoJS.enc.Latin1);
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};
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// utility function for connecting front and back ends via promises
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// Takes an implementation function and 0 or more arguments
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function promise(implementation) {
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var args = Array.prototype.slice.call(arguments);
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args.shift();
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return new Promise(function(resolve) {
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resolve(toArrayBuffer(implementation.apply(this, args)));
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});
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};
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return {
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encrypt: function(algorithm, key, data) {
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if (algorithm.name === "AES-CBC")
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return promise(encryptAESCBC, data, key, algorithm.iv.buffer || algorithm.iv);
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},
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decrypt: function(algorithm, key, data) {
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if (algorithm.name === "AES-CBC")
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return promise(decryptAESCBC, data, key, algorithm.iv.buffer || algorithm.iv);
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},
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sign: function(algorithm, key, data) {
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if (algorithm.name === "HMAC" && algorithm.hash === "SHA-256")
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return promise(HmacSHA256, key, data);
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},
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importKey: function(format, key, algorithm, extractable, usages) {
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return new Promise(function(resolve,reject){ resolve(key); });
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}
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};
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})();
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} // if !window.crypto.subtle
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})();
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