2013-04-02 09:02:57 -04:00
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/**
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* High level crypto api that invokes native crypto (if available) and
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* gracefully degrades to JS crypto (if unavailable)
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*/
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app.crypto.Crypto = function(window, util) {
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'use strict';
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var keypair = null, // the user's keys used to encrypt item-keys
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aes = new app.crypto.AesCBC(forge), // use AES-CBC mode by default
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rsa = new app.crypto.RSA(forge, util); // use RSA for asym. crypto
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2013-03-13 11:58:46 -04:00
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/**
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* Initializes the crypto modules by fetching the user's
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* encrypted secret key from storage and storing it in memory.
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*/
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this.init = function(args, callback) {
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var self = this;
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this.emailAddress = args.emailAddress;
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this.keySize = args.keySize;
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this.ivSize = args.keySize;
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// derive PBKDF2 from password in web worker thread
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this.deriveKey(args.password, args.keySize, function(pbkdf2) {
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// fetch user's encrypted secret key from keychain/storage
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var keyStore = new app.dao.LocalStorageDAO(window);
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var storageId = args.emailAddress + '_encryptedKeypair';
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var storedKeypair = keyStore.read(storageId);
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// check if key exists
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if (!storedKeypair) {
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// generate keys, encrypt and persist if none exists
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generateKeypair(keyStore, storageId, pbkdf2);
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} else {
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// decrypt key
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decryptKeypair(storedKeypair, pbkdf2);
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}
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});
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function generateKeypair(keyStore, storageId, pbkdf2) {
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// generate RSA keypair in web worker
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rsa.generateKeypair(rsa_test.keySize, function(err) {
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if (err) {
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callback(err);
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return;
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}
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keypair = rsa.exportKeys();
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// encrypt keypair
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var iv = util.random(self.ivSize);
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var encryptedKeys = aes.encrypt(JSON.stringify(keypair), pbkdf2, iv);
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// store encrypted keypair
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var newStoredKeypair = {
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_id: keypair._id,
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userId: args.emailAddress,
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encryptedKeys: encryptedKeys,
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keyIV: iv
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};
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keyStore.persist(storageId, newStoredKeypair);
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callback();
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});
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}
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function decryptKeypair(storedKeypair, pbkdf2) {
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try {
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var keypairJson = aes.decrypt(storedKeypair.encryptedKeys, pbkdf2, storedKeypair.keyIV);
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keypair = JSON.parse(keypairJson);
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} catch (ex) {
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callback({
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errMsg: 'Wrong password!'
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});
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return;
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}
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callback();
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}
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};
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/**
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* Do PBKDF2 key derivation in a WebWorker thread
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*/
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this.deriveKey = function(password, keySize, callback) {
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// check for WebWorker support
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if (window.Worker) {
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// init webworker thread
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var worker = new Worker(app.config.workerPath + '/crypto/pbkdf2-worker.js');
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worker.onmessage = function(e) {
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// return derived key from the worker
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callback(e.data);
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};
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// send plaintext data to the worker
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worker.postMessage({
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password: password,
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keySize: keySize
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});
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} else {
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// no WebWorker support... do synchronous call
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var pbkdf2 = new app.crypto.PBKDF2();
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var key = pbkdf2.getKey(password, keySize);
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callback(key);
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}
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};
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//
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// En/Decrypts single item
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//
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this.aesEncrypt = function(plaintext, key, iv, callback) {
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if (window.Worker) {
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var worker = new Worker(app.config.workerPath + '/crypto/aes-worker.js');
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worker.onmessage = function(e) {
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callback(e.data);
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};
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worker.postMessage({
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type: 'encrypt',
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plaintext: plaintext,
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key: key,
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iv: iv
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});
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} else {
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var ct = this.aesEncryptSync(plaintext, key, iv);
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callback(ct);
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}
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};
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this.aesDecrypt = function(ciphertext, key, iv, callback) {
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if (window.Worker) {
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var worker = new Worker(app.config.workerPath + '/crypto/aes-worker.js');
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worker.onmessage = function(e) {
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callback(e.data);
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};
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worker.postMessage({
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type: 'decrypt',
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ciphertext: ciphertext,
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key: key,
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iv: iv
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});
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} else {
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var pt = this.aesDecryptSync(ciphertext, key, iv);
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callback(pt);
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}
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};
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this.aesEncryptSync = function(plaintext, key, iv) {
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return aes.encrypt(plaintext, key, iv);
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};
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this.aesDecryptSync = function(ciphertext, key, iv) {
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return aes.decrypt(ciphertext, key, iv);
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};
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//
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// En/Decrypt a list of items with AES in a WebWorker thread
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//
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this.aesEncryptList = function(list, callback) {
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if (window.Worker) {
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var worker = new Worker(app.config.workerPath + '/crypto/aes-batch-worker.js');
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worker.onmessage = function(e) {
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callback(e.data);
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};
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worker.postMessage({
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type: 'encrypt',
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list: list
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});
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} else {
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var encryptedList = util.encryptList(aes, list);
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callback(encryptedList);
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}
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};
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this.aesDecryptList = function(list, callback) {
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if (window.Worker) {
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var worker = new Worker(app.config.workerPath + '/crypto/aes-batch-worker.js');
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worker.onmessage = function(e) {
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callback(e.data);
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};
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worker.postMessage({
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type: 'decrypt',
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list: list
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});
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} else {
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var decryptedList = util.decryptList(aes, list);
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callback(decryptedList);
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}
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};
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//
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// En/Decrypt something speficially using the user's secret key
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//
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this.aesEncryptForUser = function(plaintext, iv, callback) {
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var ciphertext = aes.encrypt(plaintext, symmetricUserKey, iv);
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callback(ciphertext);
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};
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this.aesDecryptForUser = function(ciphertext, iv, callback) {
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var decrypted = aes.decrypt(ciphertext, symmetricUserKey, iv);
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callback(decrypted);
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};
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this.aesEncryptForUserSync = function(plaintext, iv) {
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return aes.encrypt(plaintext, symmetricUserKey, iv);
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};
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this.aesDecryptForUserSync = function(ciphertext, iv) {
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return aes.decrypt(ciphertext, symmetricUserKey, iv);
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};
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this.aesEncryptListForUser = function(list, callback) {
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var envelope, envelopes = [],
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self = this;
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// package objects into batchable envelope format
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list.forEach(function(i) {
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envelope = {
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id: i.id,
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plaintext: i,
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key: util.random(self.keySize),
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iv: util.random(self.ivSize)
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};
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envelopes.push(envelope);
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});
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// encrypt list
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this.aesEncryptList(envelopes, function(encryptedList) {
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// encrypt keys for user
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encryptedList.forEach(function(i) {
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// process new values
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i.itemIV = i.iv;
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i.keyIV = util.random(self.ivSize);
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i.encryptedKey = self.aesEncryptForUserSync(i.key, i.keyIV);
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// delete old ones
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delete i.iv;
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delete i.key;
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});
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callback(encryptedList);
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});
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};
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this.aesDecryptListForUser = function(encryptedList, callback) {
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var list = [],
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self = this;
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// decrypt keys for user
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encryptedList.forEach(function(i) {
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// decrypt item key
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i.key = self.aesDecryptForUserSync(i.encryptedKey, i.keyIV);
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i.iv = i.itemIV;
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// delete old values
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delete i.keyIV;
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delete i.itemIV;
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delete i.encryptedKey;
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});
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// decrypt list
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this.aesDecryptList(encryptedList, function(decryptedList) {
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// add plaintext to list
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decryptedList.forEach(function(i) {
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list.push(i.plaintext);
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});
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callback(list);
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});
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};
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};
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