encryption and decryption by AES-CBC (Java)

CryptAES128.java

import java.security.spec.AlgorithmParameterSpec;
import javax.crypto.Cipher;
import javax.crypto.spec.SecretKeySpec;
import javax.crypto.spec.IvParameterSpec;

class CryptAES {
  static final String cipher_type = "AES/CBC/PKCS5Padding";

  public static void main(String[] args) {
    String key  = args[0];
    String iv   = args[1];
    String data = args[2];

    byte[] enc = encode(key, iv, data.getBytes());
    byte[] dec = decode(key, iv, enc);

    for (int i = 0; i < enc.length; i++) {
      System.out.printf("%02x", enc[i]);
    }
    System.out.println();
        
    System.out.println(new String(dec));
  }

  public static byte[] encode(String skey, String iv, byte[] data) {
    return process(Cipher.ENCRYPT_MODE, skey, iv, data);
  }

  public static byte[] decode(String skey, String iv, byte[] data) {
    return process(Cipher.DECRYPT_MODE, skey, iv, data);
  }

  private static byte[] process(int mode, String skey, String iv, byte[] data) {
    SecretKeySpec key = new SecretKeySpec(skey.getBytes(), "AES");
    AlgorithmParameterSpec param = new IvParameterSpec(iv.getBytes());
    try {
      Cipher cipher = Cipher.getInstance(cipher_type);
      cipher.init(mode, key, param);
      return cipher.doFinal(data);
    } catch (Exception e) {
      System.err.println(e.getMessage());
      throw new RuntimeException(e);
    }
  }

}