#NEWLINE# def _create_symmetric_key( self , value ) : #NEWLINE# #INDENT# if ( value is None ) : #NEWLINE# #INDENT# return SymmetricKey ( ) #NEWLINE# #UNINDENT# else : #NEWLINE# #INDENT# key_block = self . _build_key_block ( value ) #NEWLINE# return SymmetricKey ( key_block )