started refacroting crypto

src/js/crypto/crypto.js

@@ -5,44 +5,71 @@
 app.crypto.Crypto = function(window, util) {
 	'use strict';
 
-	var symmetricUserKey = null, // the user's secret key used to encrypt item-keys
+	var keypair = null, // the user's keys used to encrypt item-keys
-		keyId = null, // the key ID linking the user's key set
+		aes = new app.crypto.AesCBC(forge), // use AES-CBC mode by default
-		aes = new app.crypto.AesCBC(forge); // use AES-CBC mode by default
+		rsa = new app.crypto.RSA(forge, util); // use RSA for asym. crypto
 
 	/**
 	 * Initializes the crypto modules by fetching the user's
 	 * encrypted secret key from storage and storing it in memory.
 	 */
-	this.init = function(emailAddress, password, keySize, ivSize, callback) {
+	this.init = function(args, callback) {
-		this.emailAddress = emailAddress;
+		var self = this;
-		this.keySize = keySize;
+
-		this.ivSize = ivSize;
+		this.emailAddress = args.emailAddress;
+		this.keySize = args.keySize;
+		this.ivSize = args.keySize;
 
 		// derive PBKDF2 from password in web worker thread
-		this.deriveKey(password, keySize, function(pbkdf2) {
+		this.deriveKey(args.password, args.keySize, function(pbkdf2) {
 
 			// fetch user's encrypted secret key from keychain/storage
 			var keyStore = new app.dao.LocalStorageDAO(window);
-			var storageId = emailAddress + '_encryptedSymmetricKey';
+			var storageId = args.emailAddress + '_encryptedKeypair';
-			var storedKey = keyStore.read(storageId);
+			var storedKeypair = keyStore.read(storageId);
 
 			// check if key exists
-			if (!storedKey) {
+			if (!storedKeypair) {
-				// generate key, encrypt and persist if none exists
+				// generate keys, encrypt and persist if none exists
-				symmetricUserKey = util.random(keySize);
+				generateKeypair(keyStore, storageId, pbkdf2);
-				var iv = util.random(ivSize);
-				var key = aes.encrypt(symmetricUserKey, pbkdf2, iv);
-				storedKey = {
-					_id: util.UUID(),
-					userId: emailAddress,
-					encryptedKey: key,
-					keyIV: iv
-				};
-				keyStore.persist(storageId, storedKey);
 			} else {
 				// decrypt key
+				decryptKeypair(storedKeypair, pbkdf2);
+			}
+
+		});
+
+		function generateKeypair(keyStore, storageId, pbkdf2) {
+			// generate RSA keypair in web worker
+			rsa.generateKeypair(rsa_test.keySize, function(err) {
+				if (err) {
+					callback(err);
+					return;
+				}
+
+				keypair = rsa.exportKeys();
+
+				// encrypt keypair
+				var iv = util.random(self.ivSize);
+				var encryptedKeys = aes.encrypt(JSON.stringify(keypair), pbkdf2, iv);
+
+				// store encrypted keypair
+				var newStoredKeypair = {
+					_id: keypair._id,
+					userId: args.emailAddress,
+					encryptedKeys: encryptedKeys,
+					keyIV: iv
+				};
+				keyStore.persist(storageId, newStoredKeypair);
+
+				callback();
+			});
+		}
+
+		function decryptKeypair(storedKeypair, pbkdf2) {
 			try {
-					symmetricUserKey = aes.decrypt(storedKey.encryptedKey, pbkdf2, storedKey.keyIV);
+				var keypairJson = aes.decrypt(storedKeypair.encryptedKeys, pbkdf2, storedKeypair.keyIV);
+				keypair = JSON.parse(keypairJson);
 			} catch (ex) {
 				callback({
 					errMsg: 'Wrong password!'
@@ -50,11 +77,8 @@ app.crypto.Crypto = function(window, util) {
 				return;
 			}
 
-			}
-			keyId = storedKey._id;
-
 			callback();
-		});
+		}
 	};
 
 	/**
@@ -86,18 +110,6 @@ app.crypto.Crypto = function(window, util) {
 		}
 	};
 
-	/**
-	 * Derive an asymmetric keypait from the user's secret
-	 */
-	this.deriveKeyPair = function(naclCrypto, callback) {
-		naclCrypto.generateKeypair(symmetricUserKey, function(keys) {
-			if (keyId) {
-				keys.id = keyId;
-			}
-			callback(keys);
-		});
-	};
-
 	//
 	// En/Decrypts single item
 	//

src/js/crypto/rsa.js

@@ -1,24 +1,24 @@
 /**
  * A Wrapper for Forge's RSA encryption
  */
-app.crypto.RSA = function(forge) {
+app.crypto.RSA = function(forge, util) {
 	'use strict';
 
 	var utl = forge.util;
 
-	var publicKey = null,
+	var keypair = null;
-		privateKey = null;
 
 	/**
 	 * Initializes the RSA module by passing the user's keypair
 	 * The private key is option and required only for decryption
 	 * and signing
 	 */
-	this.init = function(pubkeyPem, privkeyPem) {
+	this.init = function(pubkeyPem, privkeyPem, keyId) {
-		publicKey = forge.pki.publicKeyFromPem(pubkeyPem);
+		keypair.publicKey = forge.pki.publicKeyFromPem(pubkeyPem);
 		if (privkeyPem) {
-			privateKey = forge.pki.privateKeyFromPem(privkeyPem);
+			keypair.privateKey = forge.pki.privateKeyFromPem(privkeyPem);
 		}
+		keypair._id = keyId;
 	};
 
 	/**
@@ -28,8 +28,8 @@ app.crypto.RSA = function(forge) {
 		forge.rsa.generateKeyPair({
 			bits: keySize,
 			workerScript: app.config.workerPath + '/../../lib/forge/prime.worker.js'
-		}, function(err, keypair) {
+		}, function(err, newKeypair) {
-			if (err || !keypair.publicKey || !keypair.privateKey) {
+			if (err || !newKeypair || !newKeypair.publicKey || !newKeypair.privateKey) {
 				callback({
 					errMsg: 'RSA keygeneration failed!',
 					err: err
@@ -37,8 +37,9 @@ app.crypto.RSA = function(forge) {
 				return;
 			}
 
-			publicKey = keypair.publicKey;
+			keypair = newKeypair;
-			privateKey = keypair.privateKey;
+			// generate unique keypair ID
+			keypair._id = util.UUID();
 
 			callback();
 		});
@@ -49,8 +50,9 @@ app.crypto.RSA = function(forge) {
 	 */
 	this.exportKeys = function() {
 		return {
-			pubkeyPem: forge.pki.publicKeyToPem(publicKey),
+			_id: keypair._id,
-			privkeyPem: forge.pki.privateKeyToPem(privateKey)
+			pubkeyPem: forge.pki.publicKeyToPem(keypair.publicKey),
+			privkeyPem: forge.pki.privateKeyToPem(keypair.privateKey)
 		};
 	};
 
@@ -61,7 +63,7 @@ app.crypto.RSA = function(forge) {
 	 */
 	this.encrypt = function(plaintext) {
 		// encode plaintext to utf8 and encrypt
-		var ct = publicKey.encrypt(utl.encodeUtf8(plaintext));
+		var ct = keypair.publicKey.encrypt(utl.encodeUtf8(plaintext));
 		// encode ciphtext to base64
 		return utl.encode64(ct);
 	};
@@ -75,7 +77,7 @@ app.crypto.RSA = function(forge) {
 		// decode base64 ciphertext to utf8
 		var ctUtf8 = utl.decode64(ciphertext);
 		// decrypt and decode to utf16
-		return utl.decodeUtf8(privateKey.decrypt(ctUtf8));
+		return utl.decodeUtf8(keypair.privateKey.decrypt(ctUtf8));
 	};
 
 	/**
@@ -91,7 +93,7 @@ app.crypto.RSA = function(forge) {
 		});
 
 		// encode signature to base64
-		return utl.encode64(privateKey.sign(sha));
+		return utl.encode64(keypair.privateKey.sign(sha));
 	};
 
 	/**
@@ -110,7 +112,7 @@ app.crypto.RSA = function(forge) {
 			sha.update(utl.decode64(i));
 		});
 
-		return publicKey.verify(sha.digest().getBytes(), sigUtf8);
+		return keypair.publicKey.verify(sha.digest().getBytes(), sigUtf8);
 	};
 
 };

test/unit/crypto-test.js

@@ -13,7 +13,11 @@ asyncTest("Init", 2, function() {
 	crypto_test.crypto = new app.crypto.Crypto(window, crypto_test.util);
 	ok(crypto_test.crypto, 'Crypto');
 
-	crypto_test.crypto.init(crypto_test.user, crypto_test.password, crypto_test.keySize, crypto_test.ivSize, function() {
+	crypto_test.crypto.init({
+		emailAddress: crypto_test.user,
+		password: crypto_test.password,
+		keySize: crypto_test.keySize
+	}, function() {
 		ok(true, 'Init crypto');
 
 		start();

test/unit/rsa-test.js

@@ -2,7 +2,7 @@ module("RSA Crypto");
 
 var rsa_test = {
 	keySize: 1024,
-	rsa: new app.crypto.RSA(forge),
+	rsa: new app.crypto.RSA(forge, new app.crypto.Util(window, uuid)),
 	test_message: '06a9214036b8a15b512e03d534120006'
 };