2ee36c2984
- Remove the boolean return value of various internal functions that throw on error (the returned value was unused in most cases) - Update and fix type definitions
128 lines
4.3 KiB
JavaScript
128 lines
4.3 KiB
JavaScript
// GPG4Browsers - An OpenPGP implementation in javascript
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// Copyright (C) 2011 Recurity Labs GmbH
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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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* @requires web-stream-tools
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* @requires config
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* @requires crypto
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* @requires enums
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* @requires util
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* @requires packet
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*/
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import stream from 'web-stream-tools';
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import config from '../config';
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import crypto from '../crypto';
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import enums from '../enums';
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import util from '../util';
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import {
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LiteralDataPacket,
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CompressedDataPacket,
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OnePassSignaturePacket,
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SignaturePacket
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} from '../packet';
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/**
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* Implementation of the Symmetrically Encrypted Data Packet (Tag 9)
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*
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* {@link https://tools.ietf.org/html/rfc4880#section-5.7|RFC4880 5.7}:
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* The Symmetrically Encrypted Data packet contains data encrypted with a
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* symmetric-key algorithm. When it has been decrypted, it contains other
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* packets (usually a literal data packet or compressed data packet, but in
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* theory other Symmetrically Encrypted Data packets or sequences of packets
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* that form whole OpenPGP messages).
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* @memberof module:packet
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*/
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class SymmetricallyEncryptedDataPacket {
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constructor() {
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/**
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* Packet type
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* @type {module:enums.packet}
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*/
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this.tag = enums.packet.symmetricallyEncryptedData;
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/**
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* Encrypted secret-key data
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*/
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this.encrypted = null;
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/**
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* Decrypted packets contained within.
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* @type {PacketList}
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*/
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this.packets = null;
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/**
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* When true, decrypt fails if message is not integrity protected
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* @see module:config.ignoreMdcError
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*/
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this.ignoreMdcError = config.ignoreMdcError;
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}
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read(bytes) {
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this.encrypted = bytes;
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}
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write() {
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return this.encrypted;
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}
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/**
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* Decrypt the symmetrically-encrypted packet data
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* See {@link https://tools.ietf.org/html/rfc4880#section-9.2|RFC 4880 9.2} for algorithms.
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* @param {module:enums.symmetric} sessionKeyAlgorithm Symmetric key algorithm to use
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* @param {Uint8Array} key The key of cipher blocksize length to be used
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* @throws {Error} if decryption was not successful
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* @async
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*/
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async decrypt(sessionKeyAlgorithm, key, streaming) {
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// If MDC errors are not being ignored, all missing MDC packets in symmetrically encrypted data should throw an error
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if (!this.ignoreMdcError) {
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throw new Error('Decryption failed due to missing MDC.');
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}
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this.encrypted = await stream.readToEnd(this.encrypted);
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const decrypted = await crypto.cfb.decrypt(sessionKeyAlgorithm, key,
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this.encrypted.subarray(crypto.cipher[sessionKeyAlgorithm].blockSize + 2),
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this.encrypted.subarray(2, crypto.cipher[sessionKeyAlgorithm].blockSize + 2)
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);
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await this.packets.read(decrypted, {
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LiteralDataPacket,
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CompressedDataPacket,
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OnePassSignaturePacket,
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SignaturePacket
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}, streaming);
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}
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/**
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* Encrypt the symmetrically-encrypted packet data
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* See {@link https://tools.ietf.org/html/rfc4880#section-9.2|RFC 4880 9.2} for algorithms.
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* @param {module:enums.symmetric} sessionKeyAlgorithm Symmetric key algorithm to use
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* @param {Uint8Array} key The key of cipher blocksize length to be used
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* @throws {Error} if encryption was not successful
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* @async
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*/
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async encrypt(algo, key) {
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const data = this.packets.write();
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const prefix = await crypto.getPrefixRandom(algo);
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const FRE = await crypto.cfb.encrypt(algo, key, prefix, new Uint8Array(crypto.cipher[algo].blockSize));
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const ciphertext = await crypto.cfb.encrypt(algo, key, data, FRE.subarray(2));
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this.encrypted = util.concat([FRE, ciphertext]);
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}
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}
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export default SymmetricallyEncryptedDataPacket;
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