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<h1 class="page-title">Source: worker/async_proxy.js</h1>
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<pre class="prettyprint source"><code>// GPG4Browsers - An OpenPGP implementation in javascript
// Copyright (C) 2011 Recurity Labs GmbH
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
/**
* @requires crypto
* @requires enums
* @requires packet
* @requires type_keyid
* @requires key
* @module async_proxy
*/
var crypto = require('../crypto'),
packet = require('../packet'),
key = require('../key.js'),
type_keyid = require('../type/keyid.js'),
enums = require('../enums.js');
var INITIAL_RANDOM_SEED = 50000, // random bytes seeded to worker
RANDOM_SEED_REQUEST = 20000; // random bytes seeded after worker request
/**
* Initializes a new proxy and loads the web worker
* @constructor
* @param {String} path The path to the worker or 'openpgp.worker.js' by default
*/
function AsyncProxy(path) {
this.worker = new Worker(path || 'openpgp.worker.js');
this.worker.onmessage = this.onMessage.bind(this);
this.seedRandom(INITIAL_RANDOM_SEED);
// FIFO
this.tasks = [];
}
/**
* Message handling
*/
AsyncProxy.prototype.onMessage = function(event) {
var msg = event.data;
switch (msg.event) {
case 'method-return':
this.tasks.shift()(msg.err ? new Error(msg.err) : null, msg.data);
break;
case 'request-seed':
this.seedRandom(RANDOM_SEED_REQUEST);
break;
default:
throw new Error('Unknown Worker Event.');
}
};
/**
* Send message to worker with random data
* @param {Integer} size Number of bytes to send
*/
AsyncProxy.prototype.seedRandom = function(size) {
var buf = this.getRandomBuffer(size);
this.worker.postMessage({event: 'seed-random', buf: buf});
};
/**
* Get Uint8Array with random numbers
* @param {Integer} size Length of buffer
* @return {Uint8Array}
*/
AsyncProxy.prototype.getRandomBuffer = function(size) {
if (!size) return null;
var buf = new Uint8Array(size);
crypto.random.getRandomValues(buf);
return buf;
};
/**
* Terminates the worker
*/
AsyncProxy.prototype.terminate = function() {
this.worker.terminate();
};
/**
* Encrypts message text with keys
* @param {Array<module:key~Key>} keys array of keys, used to encrypt the message
* @param {String} text message as native JavaScript string
* @param {Function} callback receives encrypted ASCII armored message
*/
AsyncProxy.prototype.encryptMessage = function(keys, text, callback) {
keys = keys.map(function(key) {
return key.toPacketlist();
});
this.worker.postMessage({
event: 'encrypt-message',
keys: keys,
text: text
});
this.tasks.push(callback);
};
/**
* Signs message text and encrypts it
* @param {Array<module:key~Key>} publicKeys array of keys, used to encrypt the message
* @param {module:key~Key} privateKey private key with decrypted secret key data for signing
* @param {String} text message as native JavaScript string
* @param {Function} callback receives encrypted ASCII armored message
*/
AsyncProxy.prototype.signAndEncryptMessage = function(publicKeys, privateKey, text, callback) {
publicKeys = publicKeys.map(function(key) {
return key.toPacketlist();
});
privateKey = privateKey.toPacketlist();
this.worker.postMessage({
event: 'sign-and-encrypt-message',
publicKeys: publicKeys,
privateKey: privateKey,
text: text
});
this.tasks.push(callback);
};
/**
* Decrypts message
* @param {module:key~Key} privateKey private key with decrypted secret key data
* @param {module:message~Message} message the message object with the encrypted data
* @param {Function} callback receives decrypted message as as native JavaScript string
* or null if no literal data found
*/
AsyncProxy.prototype.decryptMessage = function(privateKey, message, callback) {
privateKey = privateKey.toPacketlist();
this.worker.postMessage({
event: 'decrypt-message',
privateKey: privateKey,
message: message
});
this.tasks.push(callback);
};
/**
* Decrypts message and verifies signatures
* @param {module:key~Key} privateKey private key with decrypted secret key data
* @param {Array<module:key~Key>} publicKeys public keys to verify signatures
* @param {module:message~Message} message the message object with signed and encrypted data
* @param {Function} callback receives decrypted message as as native JavaScript string
* with verified signatures or null if no literal data found
*/
AsyncProxy.prototype.decryptAndVerifyMessage = function(privateKey, publicKeys, message, callback) {
privateKey = privateKey.toPacketlist();
publicKeys = publicKeys.map(function(key) {
return key.toPacketlist();
});
this.worker.postMessage({
event: 'decrypt-and-verify-message',
privateKey: privateKey,
publicKeys: publicKeys,
message: message
});
this.tasks.push(function(err, data) {
if (data) {
data.signatures = data.signatures.map(function(sig) {
sig.keyid = type_keyid.fromClone(sig.keyid);
return sig;
});
}
callback(err, data);
});
};
/**
* Signs a cleartext message
* @param {Array<module:key~Key>} privateKeys private key with decrypted secret key data to sign cleartext
* @param {String} text cleartext
* @param {Function} callback receives ASCII armored message
*/
AsyncProxy.prototype.signClearMessage = function(privateKeys, text, callback) {
privateKeys = privateKeys.map(function(key) {
return key.toPacketlist();
});
this.worker.postMessage({
event: 'sign-clear-message',
privateKeys: privateKeys,
text: text
});
this.tasks.push(callback);
};
/**
* Verifies signatures of cleartext signed message
* @param {Array<module:key~Key>} publicKeys public keys to verify signatures
* @param {module:cleartext~CleartextMessage} message cleartext message object with signatures
* @param {Function} callback receives cleartext with status of verified signatures
*/
AsyncProxy.prototype.verifyClearSignedMessage = function(publicKeys, message, callback) {
publicKeys = publicKeys.map(function(key) {
return key.toPacketlist();
});
this.worker.postMessage({
event: 'verify-clear-signed-message',
publicKeys: publicKeys,
message: message
});
this.tasks.push(function(err, data) {
if (data) {
data.signatures = data.signatures.map(function(sig) {
sig.keyid = type_keyid.fromClone(sig.keyid);
return sig;
});
}
callback(err, data);
});
};
/**
* Generates a new OpenPGP key pair. Currently only supports RSA keys.
* Primary and subkey will be of same type.
* @param {module:enums.publicKey} keyType to indicate what type of key to make.
* RSA is 1. See {@link http://tools.ietf.org/html/rfc4880#section-9.1}
* @param {Integer} numBits number of bits for the key creation. (should be 1024+, generally)
* @param {String} userId assumes already in form of "User Name <username@email.com>"
* @param {String} passphrase The passphrase used to encrypt the resulting private key
* @param {Function} callback receives object with key and public and private armored texts
*/
AsyncProxy.prototype.generateKeyPair = function(keyType, numBits, userId, passphrase, callback) {
this.worker.postMessage({
event: 'generate-key-pair',
keyType: keyType,
numBits: numBits,
userId: userId,
passphrase: passphrase
});
this.tasks.push(function(err, data) {
if (data) {
var packetlist = packet.List.fromStructuredClone(data.key);
data.key = new key.Key(packetlist);
}
callback(err, data);
});
};
/**
* Decrypts secret part of all secret key packets of key.
* @param {module:key~Key} privateKey private key with encrypted secret key data
* @param {String} password password to unlock the key
* @param {Function} callback receives decrypted key
*/
AsyncProxy.prototype.decryptKey = function(privateKey, password, callback) {
privateKey = privateKey.toPacketlist();
this.worker.postMessage({
event: 'decrypt-key',
privateKey: privateKey,
password: password
});
this.tasks.push(function(err, data) {
if (data) {
var packetlist = packet.List.fromStructuredClone(data);
data = new key.Key(packetlist);
}
callback(err, data);
});
};
/**
* Decrypts secret part of key packets matching array of keyids.
* @param {module:key~Key} privateKey private key with encrypted secret key data
* @param {Array<module:type/keyid>} keyIds
* @param {String} password password to unlock the key
* @param {Function} callback receives decrypted key
*/
AsyncProxy.prototype.decryptKeyPacket = function(privateKey, keyIds, password, callback) {
privateKey = privateKey.toPacketlist();
this.worker.postMessage({
event: 'decrypt-key-packet',
privateKey: privateKey,
keyIds: keyIds,
password: password
});
this.tasks.push(function(err, data) {
if (data) {
var packetlist = packet.List.fromStructuredClone(data);
data = new key.Key(packetlist);
}
callback(err, data);
});
};
module.exports = AsyncProxy;
</code></pre>
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