code: package mubench.examples.jca;
  
  import javax.crypto.spec.SecretKeySpec;
  import javax.crypto.Cipher;
  
  public class Encrypting {
  	public static byte[] encryptWithKey(byte[] content) throws Exception {
  		// using a constant key is unsafe
  		SecretKeySpec keySpec = new SecretKeySpec("RAS".getBytes("UTF-8"), "AES/CBC/PKCS5Padding");
  		Cipher c = Cipher.getInstance("AES");
  		c.init(Cipher.ENCRYPT_MODE, keySpec);
  		return c.doFinal(content);
  	}
  	
  	private static byte[] encrypt(byte[] key, byte[] content) throws Exception {
  		// "AES" has an unsafe default configuration of "AES/ECB/PKCS5Padding"
  		SecretKeySpec keySpec = new SecretKeySpec(key, "AES");
  		Cipher c = Cipher.getInstance("AES");
  		c.init(Cipher.ENCRYPT_MODE, keySpec);
  		return c.doFinal(content);
  	}
  }
  