Java AES chiffrement et le déchiffrement

Je tiens à chiffrer et de déchiffrer un mot de passe à l'aide de 128 bits de cryptage AES avec une clé 16 octets. Je suis javax.crypto.BadPaddingException erreur lors du déchiffrement de la valeur. Ai-je raté quelque chose lors du déchiffrement?

public static void main(String args[]) {
Test t = new Test();
String encrypt = new String(t.encrypt("mypassword"));
System.out.println("decrypted value:" + t.decrypt("ThisIsASecretKey", encrypt));
}
public String encrypt(String value) {
try {
byte[] raw = new byte[]{'T', 'h', 'i', 's', 'I', 's', 'A', 'S', 'e', 'c', 'r', 'e', 't', 'K', 'e', 'y'};
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
byte[] encrypted = cipher.doFinal(value.getBytes());
System.out.println("encrypted string:" + (new String(encrypted)));
return new String(skeySpec.getEncoded());
} catch (NoSuchAlgorithmException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (IllegalBlockSizeException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (BadPaddingException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (InvalidKeyException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (NoSuchPaddingException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
}
return null;
}
public String decrypt(String key, String encrypted) {
try {
SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes(), "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.DECRYPT_MODE, new SecretKeySpec(skeySpec.getEncoded(), "AES"));
//getting error here
byte[] original = cipher.doFinal(encrypted.getBytes());
return new String(original);
} catch (IllegalBlockSizeException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (BadPaddingException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (InvalidKeyException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (NoSuchAlgorithmException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (NoSuchPaddingException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
}
return null;
}  

Message d'erreur

encrypted string:�Bj�.�Ntk�F�`�
encrypted key:ThisIsASecretKey
decrypted value:null
May 25, 2012 12:54:02 PM bean.Test decrypt
SEVERE: null
javax.crypto.BadPaddingException: Given final block not properly padded
at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
at com.sun.crypto.provider.SunJCE_f.b(DashoA13*..)
at com.sun.crypto.provider.AESCipher.engineDoFinal(DashoA13*..)
at javax.crypto.Cipher.doFinal(DashoA13*..)
at bean.Test.decrypt(Test.java:55)
at bean.Test.main(Test.java:24)

Enfin, je suis en utilisant la Solution suivante basée sur @QuantumMechanic réponse

public class Test {
public String encryptionKey;
public static void main(String args[]) {
Test t = new Test();
String encrypt = t.encrypt("mypassword");
System.out.println("decrypted value:" + t.decrypt(t.encryptionKey, encrypt));
}
public String encrypt(String value) {
try {
//Get the KeyGenerator
KeyGenerator kgen = KeyGenerator.getInstance("AES");
kgen.init(256);
//Generate the secret key specs.
SecretKey skey = kgen.generateKey();
byte[] raw = skey.getEncoded();
String key = new Base64().encodeAsString(raw);
this.encryptionKey = key;
System.out.println("------------------Key------------------");
System.out.println(key);
System.out.println("--------------End of Key---------------");
SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");
Cipher cipher = Cipher.getInstance("AES");
cipher.init(Cipher.ENCRYPT_MODE, skeySpec);
String encrypt = (new Base64()).encodeAsString(cipher.doFinal(value.getBytes()));
System.out.println("encrypted string:" + encrypt);
return encrypt;
} catch (NoSuchAlgorithmException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (IllegalBlockSizeException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (BadPaddingException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (InvalidKeyException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (NoSuchPaddingException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
}
return null;
}
public String decrypt(String key, String encrypted) {
try {
Key k = new SecretKeySpec(Base64.getDecoder().decode(key), "AES");
Cipher c = Cipher.getInstance("AES");
c.init(Cipher.DECRYPT_MODE, k);
byte[] decodedValue = Base64.getDecoder().decode(encrypted);
byte[] decValue = c.doFinal(decodedValue);
String decryptedValue = new String(decValue);
return decryptedValue;
} catch (IllegalBlockSizeException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (BadPaddingException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (InvalidKeyException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (NoSuchAlgorithmException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
} catch (NoSuchPaddingException ex) {
Logger.getLogger(Test.class.getName()).log(Level.SEVERE, null, ex);
}
return null;
}

}