code: @Nullable
    public static X509Certificate convertByteArrayToCertficate (@Nullable final byte [] aCertBytes) throws CertificateException
    {
      if (ArrayHelper.isEmpty (aCertBytes))
        return null;
  
      // Certificate is always ISO-8859-1 encoded
      return convertStringToCertficate (new String (aCertBytes, CERT_CHARSET));
    }
docs: Convert the passed byte array to an X.509 certificate object.
  
  @param aCertBytes
  The original certificate bytes. May be <code>null</code> or empty.
  @return <code>null</code> if the passed byte array is <code>null</code> or
  empty
  @throws CertificateException
  In case the passed string cannot be converted to an X.509
  certificate.