mirror of
https://github.com/musix-org/musix-oss
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94 lines
3.9 KiB
JavaScript
94 lines
3.9 KiB
JavaScript
"use strict";
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/**
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* Copyright 2019 Google LLC. All Rights Reserved.
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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Object.defineProperty(exports, "__esModule", { value: true });
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// This file implements crypto functions we need using in-browser
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// SubtleCrypto interface `window.crypto.subtle`.
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const base64js = require("base64-js");
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// Not all browsers support `TextEncoder`. The following `require` will
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// provide a fast UTF8-only replacement for those browsers that don't support
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// text encoding natively.
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if (typeof process === 'undefined' && typeof TextEncoder === 'undefined') {
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require('fast-text-encoding');
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}
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class BrowserCrypto {
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constructor() {
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if (typeof window === 'undefined' ||
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window.crypto === undefined ||
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window.crypto.subtle === undefined) {
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throw new Error("SubtleCrypto not found. Make sure it's an https:// website.");
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}
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}
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async sha256DigestBase64(str) {
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// SubtleCrypto digest() method is async, so we must make
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// this method async as well.
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// To calculate SHA256 digest using SubtleCrypto, we first
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// need to convert an input string to an ArrayBuffer:
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const inputBuffer = new TextEncoder().encode(str);
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// Result is ArrayBuffer as well.
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const outputBuffer = await window.crypto.subtle.digest('SHA-256', inputBuffer);
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return base64js.fromByteArray(new Uint8Array(outputBuffer));
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}
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randomBytesBase64(count) {
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const array = new Uint8Array(count);
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window.crypto.getRandomValues(array);
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return base64js.fromByteArray(array);
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}
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static padBase64(base64) {
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// base64js requires padding, so let's add some '='
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while (base64.length % 4 !== 0) {
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base64 += '=';
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}
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return base64;
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}
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async verify(pubkey, data, signature) {
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const algo = {
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name: 'RSASSA-PKCS1-v1_5',
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hash: { name: 'SHA-256' },
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};
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const dataArray = new TextEncoder().encode(data);
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const signatureArray = base64js.toByteArray(BrowserCrypto.padBase64(signature));
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const cryptoKey = await window.crypto.subtle.importKey('jwk', pubkey, algo, true, ['verify']);
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// SubtleCrypto's verify method is async so we must make
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// this method async as well.
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const result = await window.crypto.subtle.verify(algo, cryptoKey, signatureArray, dataArray);
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return result;
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}
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async sign(privateKey, data) {
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const algo = {
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name: 'RSASSA-PKCS1-v1_5',
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hash: { name: 'SHA-256' },
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};
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const dataArray = new TextEncoder().encode(data);
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const cryptoKey = await window.crypto.subtle.importKey('jwk', privateKey, algo, true, ['sign']);
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// SubtleCrypto's sign method is async so we must make
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// this method async as well.
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const result = await window.crypto.subtle.sign(algo, cryptoKey, dataArray);
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return base64js.fromByteArray(new Uint8Array(result));
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}
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decodeBase64StringUtf8(base64) {
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const uint8array = base64js.toByteArray(BrowserCrypto.padBase64(base64));
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const result = new TextDecoder().decode(uint8array);
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return result;
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}
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encodeBase64StringUtf8(text) {
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const uint8array = new TextEncoder().encode(text);
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const result = base64js.fromByteArray(uint8array);
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return result;
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}
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}
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exports.BrowserCrypto = BrowserCrypto;
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//# sourceMappingURL=crypto.js.map
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