Calculates the md5 hash of a given string
        :example 'cfcd208495d565ef66e7dff9f98764da'

def md5(self, raw_output=False):
        """
        Calculates the md5 hash of a given string
        :example 'cfcd208495d565ef66e7dff9f98764da'
        """
        res = hashlib.md5(str(self.generator.random.random()).encode('utf-8'))
        if raw_output:
            return res.digest()
        return res.hexdigest()