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POGiven final block not properly padded
 

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    <p>I am trying to implement password based encryption algorithm, but I get this exception:</p> <blockquote> <p>javax.crypto.BadPaddingException: Given final block not properly padded</p> </blockquote> <p>What might be the problem? (I am new to Java.)</p> <p>Here is my code:</p> <pre><code>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; } } </code></pre> <p>(The JUnit Test)</p> <pre><code>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 &lt; passwordCrypters.length; i++) { encryptedMessages[i] = passwordCrypters[i].encrypt(MESSAGE); } } @Test public void testEncrypt() { for (byte[] encryptedMessage : encryptedMessages) { assertFalse(Arrays.equals(MESSAGE, encryptedMessage)); } assertFalse(Arrays.equals(encryptedMessages[0], encryptedMessages[2])); assertFalse(Arrays.equals(encryptedMessages[1], encryptedMessages[2])); } @Test public void testDecrypt() { for (int i = 0; i &lt; passwordCrypters.length; i++) { assertArrayEquals(MESSAGE, passwordCrypters[i].decrypt(encryptedMessages[i])); } assertArrayEquals(MESSAGE, passwordCrypters[0].decrypt(encryptedMessages[1])); assertArrayEquals(MESSAGE, passwordCrypters[1].decrypt(encryptedMessages[0])); try { assertFalse(Arrays.equals(MESSAGE, passwordCrypters[0].decrypt(encryptedMessages[2]))); } catch (CrypterException e) { // Anything goes as long as the above statement is not true. } try { assertFalse(Arrays.equals(MESSAGE, passwordCrypters[2].decrypt(encryptedMessages[1]))); } catch (CrypterException e) { // Anything goes as long as the above statement is not true. } } } </code></pre>
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