CryptoUtil.java

import android.util.Base64;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

public class CryptoUtil {
    private static final String key = "SKs9uZKvZU2VOFjQISEg4tJQyAeqX3Mm";
    private static final String initVector = "53og3sqCcKdQl5Ud";

    public static String encrypt(String value)
    {
        try
        {
            IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
            SecretKeySpec sKeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");

            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.ENCRYPT_MODE, sKeySpec, iv);

            byte[] encrypted = cipher.doFinal(value.getBytes());
            return Base64.encodeToString(encrypted, Base64.NO_WRAP);
        }
        catch (Exception ex)
        {
            System.out.println("encrypt ex: " + ex);
        }
        return null;
    }

    public static String decrypt(String encrypted) {
        try {
            IvParameterSpec iv = new IvParameterSpec(initVector.getBytes("UTF-8"));
            SecretKeySpec skeySpec = new SecretKeySpec(key.getBytes("UTF-8"), "AES");

            Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5PADDING");
            cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);
            byte[] original = cipher.doFinal(Base64.decode(encrypted.getBytes("UTF-8"), Base64.NO_WRAP));

            return new String(original);
        } catch (Exception ex) {
            System.out.println("decrypt ex: " + ex);
        }

        return null;
    }
}