i = ord(os.urandom(1))

            if i < len(alphabet):

                l.append(alphabet[i])

        return ''.join(l)

class KallitheaCrypto(object):

    @classmethod

    def hash_string(cls, str_):

        """

        Cryptographic function used for password hashing based on pybcrypt

        :param password: password to hash

        """

        if is_windows:

            return hashlib.sha256(str_).hexdigest()

        elif is_unix:

            import bcrypt

            return bcrypt.hashpw(str_, bcrypt.gensalt(10))

        else:

            raise Exception('Unknown or unsupported platform %s' \

                            % __platform__)

    "WebHelpers==1.3",

    "formencode>=1.2.4,<=1.2.6",

    "SQLAlchemy==0.7.10",

    "Mako>=0.9.0,<=1.0.0",

    "pygments>=1.5",

    "whoosh>=2.4.0,<=2.5.7",

    "celery>=2.2.5,<2.3",

    "babel>=0.9.6,<=1.3",

    "python-dateutil>=1.5.0,<2.0.0",

    "markdown==2.2.1",

    "docutils>=0.8.1,<=0.11",

    "mock",

    "URLObject==2.3.4",

    "Routes==1.13",

    "dulwich>=0.9.9,<=0.9.9",

    "mercurial>=2.9,<3.6",

]

if sys.version_info < (2, 7):

    requirements.append("importlib==1.0.1")

    requirements.append("unittest2")

    requirements.append("argparse")

if not is_windows: