code: function certBlob() {
  	var self = {
  		cbCert : new type.UInt32Le(function() {
  			return self.abCert.size();
  		}),
          abCert : new type.BinaryString(null, { readLength : new type.CallableValue(function() {
          	return self.cbCert.value;
          }) })
  	};
  	
  	return new type.Component(self);
  }
docs: For x509 certificate
  @see http://msdn.microsoft.com/en-us/library/cc241911.aspx
  @returns {type.Component}