code: public void setBytes(String key, byte[] bytes) {
  		String encoded = new String(Base64.encodeBase64(bytes));
  		setStringInternal(key, encoded);
  	}
docs: Adds the given byte array to the configuration object. If key is <code>null</code> then nothing is added.
  
  @param key
  The key under which the bytes are added.
  @param bytes
  The bytes to be added.