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1import javax.crypto.Cipher;
2import javax.crypto.spec.IvParameterSpec;
3import javax.crypto.spec.SecretKeySpec;
4import java.util.Base64;
5import java.security.InvalidKeyException;
6import javax.crypto.NoSuchPaddingException;
7import java.security.NoSuchAlgorithmException;
8import javax.crypto.BadPaddingException;
9import javax.crypto.IllegalBlockSizeException;
10public class test
11{
12public byte[] main() 
13  throws Exception {
14  
15    String encryptionKeyString =  "zxcvbnmiyjljgetu";
16    String originalMessage = "secret message";
17    byte[] encryptionKeyBytes = encryptionKeyString.getBytes();
18    byte[] messageBytes = originalMessage.getBytes();
19    
20    byte[] encryptedMessageBytes = encryptMessage(messageBytes, encryptionKeyBytes);
21    return encryptedMessageBytes;
22    //cipher.init(Cipher.DECRYPT_MODE, secretKey);
23 
24    //byte[] decryptedMessageBytes = cipher.doFinal(encryptedMessageBytes);
25    //assertThat(originalMessage).isEqualTo(new String(decryptedMessageBytes));
26
27}
28public byte[] encryptMessage(byte[] message, byte[] keyBytes)
29  throws InvalidKeyException, NoSuchPaddingException, NoSuchAlgorithmException, 
30    BadPaddingException, IllegalBlockSizeException {
31  
32    Cipher cipher = Cipher.getInstance("AES/ECB/PKCS5Padding");
33    SecretKeySpec Key = new SecretKeySpec(keyBytes, "AES");
34    cipher.init(Cipher.ENCRYPT_MODE, Key);
35    return cipher.doFinal(message);
36}
37}