Example of AES encryption and decryption in Java

AESenc.java

/**
 * Code written by P. Gajland
 * https://github.com/GaPhil
 */

import java.security.Key;
import javax.crypto.Cipher;
import sun.misc.BASE64Encoder;
import sun.misc.BASE64Decoder;
import javax.crypto.spec.SecretKeySpec;

public class AESenc {

    private static final String ALGO = "AES";
    private static final byte[] keyValue =
            new byte[]{'T', 'h', 'e', 'B', 'e', 's', 't', 'S', 'e', 'c', 'r', 'e', 't', 'K', 'e', 'y'};

    /**
     * Encrypt a string with AES algorithm.
     *
     * @param data is a string
     * @return the encrypted string
     */
    public static String encrypt(String data) throws Exception {
        Key key = generateKey();
        Cipher c = Cipher.getInstance(ALGO);
        c.init(Cipher.ENCRYPT_MODE, key);
        byte[] encVal = c.doFinal(data.getBytes());
        return new BASE64Encoder().encode(encVal);
    }

    /**
     * Decrypt a string with AES algorithm.
     *
     * @param encryptedData is a string
     * @return the decrypted string
     */
    public static String decrypt(String encryptedData) throws Exception {
        Key key = generateKey();
        Cipher c = Cipher.getInstance(ALGO);
        c.init(Cipher.DECRYPT_MODE, key);
        byte[] decordedValue = new BASE64Decoder().decodeBuffer(encryptedData);
        byte[] decValue = c.doFinal(decordedValue);
        return new String(decValue);
    }

    /**
     * Generate a new encryption key.
     */
    private static Key generateKey() throws Exception {
        return new SecretKeySpec(keyValue, ALGO);
    }
}