'Generate info line for GNTP Message
:return string:'

def _format_info(self):

    info = ('GNTP/%s    %s' % (self.info.get('version'), self.info.get('messagetype')))
    if self.info.get('encryptionAlgorithmID', None):
        info += ('    %s:%s' % (self.info.get('encryptionAlgorithmID'), self.info.get('ivValue')))
    else:
        info += '    NONE'
    if self.info.get('keyHashAlgorithmID', None):
        info += ('    %s:%s.%s' % (self.info.get('keyHashAlgorithmID'), self.info.get('keyHash'), self.info.get('salt')))
    return info
