DAbeLQ0p

1import javax.crypto.Cipher;
2import javax.crypto.spec.IvParameterSpec;
3import javax.crypto.spec.SecretKeySpec;
4//import java.util.Base64;
5import java.security.InvalidKeyException;
6import javax.crypto.NoSuchPaddingException;
7import java.security.NoSuchAlgorithmException;
8import javax.crypto.BadPaddingException;
9import javax.crypto.IllegalBlockSizeException;
10import org.apache.commons.codec.binary.Base64;
11public class ECBEncryption
12{
13    public void main() throws Exception {
14
15        String encryptionKeyString =  "thisisa128bitkey";
16        String originalMessage = "secret message";
17        byte[] encryptionKeyBytes = encryptionKeyString.getBytes("UTF-8");
18        byte[] messageBytes = originalMessage.getBytes("UTF-8");
19
20        byte[] encryptedMessageBytes = encryptMessage(messageBytes, encryptionKeyBytes);
21
22        String out = Base64.encodeBase64String(encryptedMessageBytes);
23        System.out.println(out);
24
25        byte[] decryptedMessageBytes = decryptMessage(encryptedMessageBytes,encryptionKeyBytes);
26
27        String de = Base64.encodeBase64String(decryptedMessageBytes);
28        System.out.println(de);
29        //cipher.init(Cipher.DECRYPT_MODE, secretKey);
30
31        //byte[] decryptedMessageBytes = cipher.doFinal(encryptedMessageBytes);
32        //assertThat(originalMessage).isEqualTo(new String(decryptedMessageBytes));
33
34    }
35
36    public byte[] encryptMessage(byte[] message, byte[] keyBytes)
37    throws InvalidKeyException, NoSuchPaddingException, NoSuchAlgorithmException, 
38    BadPaddingException, IllegalBlockSizeException {
39        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
40        SecretKeySpec Key = new SecretKeySpec(keyBytes, "AES");
41        cipher.init(Cipher.ENCRYPT_MODE, Key);
42        return cipher.doFinal(message);
43    }
44
45    public byte[] decryptMessage(byte[] message, byte[] keyBytes)
46    throws InvalidKeyException, NoSuchPaddingException, NoSuchAlgorithmException, 
47    BadPaddingException, IllegalBlockSizeException {
48        Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
49        SecretKeySpec Key = new SecretKeySpec(keyBytes, "AES");
50        cipher.init(Cipher.DECRYPT_MODE, Key);
51        return cipher.doFinal(message);
52    }
53}