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https://github.com/openpgpjs/openpgpjs.git
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94 lines
4.2 KiB
JavaScript
94 lines
4.2 KiB
JavaScript
// OpenPGP.js - An OpenPGP implementation in javascript
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// Copyright (C) 2016 Tankred Hase
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//
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// This library is free software; you can redistribute it and/or
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// modify it under the terms of the GNU Lesser General Public
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// License as published by the Free Software Foundation; either
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// version 3.0 of the License, or (at your option) any later version.
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//
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// This library 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 GNU
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// 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
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// License along with this library; if not, write to the Free Software
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// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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/**
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* @fileoverview This module wraps native AES-GCM en/decryption for both
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* the WebCrypto api as well as node.js' crypto api.
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*/
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'use strict';
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import util from '../util.js';
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import config from '../config';
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import asmCrypto from 'asmcrypto-lite';
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const webCrypto = util.getWebCrypto();
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const nodeCrypto = util.getNodeCrypto();
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const Buffer = util.getNodeBuffer();
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export const ivLength = 12; // size of the IV in bytes
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const TAG_LEN = 16; // size of the tag in bytes
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const ALGO = 'AES-GCM';
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/**
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* Encrypt plaintext input.
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* @param {String} cipher The symmetric cipher algorithm to use e.g. 'aes128'
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* @param {Uint8Array} plaintext The cleartext input to be encrypted
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* @param {Uint8Array} key The encryption key
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* @param {Uint8Array} iv The initialization vector (12 bytes)
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* @return {Promise<Uint8Array>} The ciphertext output
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*/
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export function encrypt(cipher, plaintext, key, iv) {
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if (cipher.substr(0,3) !== 'aes') {
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return Promise.reject(new Error('GCM mode supports only AES cipher'));
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}
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const keySize = key.length * 8;
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if (webCrypto && config.useNative && keySize !== 192) { // WebCrypto (no 192 bit support) see: https://www.chromium.org/blink/webcrypto#TOC-AES-support
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return webCrypto.importKey('raw', key, { name: ALGO }, false, ['encrypt'])
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.then(keyObj => webCrypto.encrypt({ name: ALGO, iv }, keyObj, plaintext))
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.then(ciphertext => new Uint8Array(ciphertext));
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} else if (nodeCrypto && config.useNative) { // Node crypto library
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const en = new nodeCrypto.createCipheriv('aes-' + keySize + '-gcm', new Buffer(key.buffer), new Buffer(iv.buffer));
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const encrypted = Buffer.concat([en.update(new Buffer(plaintext.buffer)), en.final()]);
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return Promise.resolve(new Uint8Array(Buffer.concat([encrypted, en.getAuthTag()])));
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} else { // asm.js fallback
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return Promise.resolve(asmCrypto.AES_GCM.encrypt(plaintext, key, iv));
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}
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}
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/**
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* Decrypt ciphertext input
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* @param {String} cipher The symmetric cipher algorithm to use e.g. 'aes128'
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* @param {Uint8Array} ciphertext The ciphertext input to be decrypted
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* @param {Uint8Array} key The encryption key
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* @param {Uint8Array} iv The initialization vector (12 bytes)
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* @return {Promise<Uint8Array>} The plaintext output
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*/
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export function decrypt(cipher, ciphertext, key, iv) {
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if (cipher.substr(0,3) !== 'aes') {
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return Promise.reject(new Error('GCM mode supports only AES cipher'));
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}
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const keySize = key.length * 8;
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if (webCrypto && config.useNative && keySize !== 192) { // WebCrypto (no 192 bit support) see: https://www.chromium.org/blink/webcrypto#TOC-AES-support
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return webCrypto.importKey('raw', key, { name: ALGO }, false, ['decrypt'])
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.then(keyObj => webCrypto.decrypt({ name: ALGO, iv }, keyObj, ciphertext))
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.then(plaintext => new Uint8Array(plaintext));
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} else if (nodeCrypto && config.useNative) { // Node crypto library
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const ctBuf = new Buffer(ciphertext.buffer);
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const de = new nodeCrypto.createDecipheriv('aes-' + keySize + '-gcm', new Buffer(key.buffer), new Buffer(iv.buffer));
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de.setAuthTag(ctBuf.slice(ctBuf.length - TAG_LEN, ctBuf.length));
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const encrypted = ctBuf.slice(0, ctBuf.length - TAG_LEN);
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return Promise.resolve(new Uint8Array(Buffer.concat([de.update(encrypted), de.final()])));
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} else { // asm.js fallback
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return Promise.resolve(asmCrypto.AES_GCM.decrypt(ciphertext, key, iv));
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}
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} |