@Override
public PwDatabaseV4 openDatabase(
InputStream inStream, String password, String keyfile, UpdateStatus status)
throws IOException, InvalidDBException {
db = createDB();
PwDbHeaderV4 header = new PwDbHeaderV4(db);
hashOfHeader = header.loadFromFile(inStream);
db.setMasterKey(password, keyfile);
db.makeFinalKey(header.masterSeed, header.transformSeed, (int) db.numKeyEncRounds);
// Attach decryptor
Cipher cipher;
try {
cipher =
CipherFactory.getInstance(
db.dataCipher, Cipher.DECRYPT_MODE, db.finalKey, header.encryptionIV);
} catch (NoSuchAlgorithmException e) {
throw new IOException("Invalid algorithm.");
} catch (NoSuchPaddingException e) {
throw new IOException("Invalid algorithm.");
} catch (InvalidKeyException e) {
throw new IOException("Invalid algorithm.");
} catch (InvalidAlgorithmParameterException e) {
throw new IOException("Invalid algorithm.");
}
InputStream decrypted = new BetterCipherInputStream(inStream, cipher, 50 * 1024);
LEDataInputStream dataDecrypted = new LEDataInputStream(decrypted);
byte[] storedStartBytes = null;
try {
storedStartBytes = dataDecrypted.readBytes(32);
if (storedStartBytes == null || storedStartBytes.length != 32) {
throw new InvalidPasswordException();
}
} catch (IOException e) {
throw new InvalidPasswordException();
}
if (!Arrays.equals(storedStartBytes, header.streamStartBytes)) {
throw new InvalidPasswordException();
}
HashedBlockInputStream hashed = new HashedBlockInputStream(dataDecrypted);
InputStream decompressed;
if (db.compressionAlgorithm == PwCompressionAlgorithm.Gzip) {
decompressed = new GZIPInputStream(hashed);
} else {
decompressed = hashed;
}
if (header.protectedStreamKey == null) {
assert (false);
throw new IOException("Invalid stream key.");
}
randomStream =
PwStreamCipherFactory.getInstance(header.innerRandomStream, header.protectedStreamKey);
if (randomStream == null) {
throw new ArcFourException();
}
ReadXmlStreamed(decompressed);
return db;
}
