我正在尝试实现基于密码的加密算法，但出现此异常：
javax.crypto.BadPaddingException：给定最终块，未正确填充
可能是什么问题？（我是Java新手。）
这是我的代码：
public class PasswordCrypter {
private Key key;
public PasswordCrypter(String password) {
try{
KeyGenerator generator;
generator = KeyGenerator.getInstance("DES");
SecureRandom sec = new SecureRandom(password.getBytes());
generator.init(sec);
key = generator.generateKey();
} catch (Exception e) {
e.printStackTrace();
}
}
public byte[] encrypt(byte[] array) throws CrypterException {
try{
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.ENCRYPT_MODE, key);
return cipher.doFinal(array);
} catch (Exception e) {
e.printStackTrace();
}
return null;
}
public byte[] decrypt(byte[] array) throws CrypterException{
try{
Cipher cipher = Cipher.getInstance("DES/ECB/PKCS5Padding");
cipher.init(Cipher.DECRYPT_MODE, key);
return cipher.doFinal(array);
} catch(Exception e ){
e.printStackTrace();
}
return null;
}
}
（JUnit测试）
public class PasswordCrypterTest {
private static final byte[] MESSAGE = "Alpacas are awesome!".getBytes();
private PasswordCrypter[] passwordCrypters;
private byte[][] encryptedMessages;
@Before
public void setUp() {
passwordCrypters = new PasswordCrypter[] {
new PasswordCrypter("passwd"),
new PasswordCrypter("passwd"),
new PasswordCrypter("otherPasswd")
};
encryptedMessages = new byte[passwordCrypters.length][];
for (int i = 0; i < passwordCrypters.length; i++) {
encryptedMessages[i] = passwordCrypters[i].encrypt(MESSAGE);
}
}