utils.py

# -*- coding: utf-8 -*-
#
# utils.py
#
# Copyright (C) 2006-2022 wolfSSL Inc.
#
# This file is part of wolfSSL. (formerly known as CyaSSL)
#
# wolfSSL is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# wolfSSL is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with this program; if not, write to the Free Software
# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA

# pylint: disable=missing-docstring, unused-import, undefined-variable

import sys
from binascii import hexlify as b2h, unhexlify as h2b  # noqa: F401

_PY3 = sys.version_info[0] == 3
_TEXT_TYPE = str if _PY3 else unicode  # noqa: F821
_BINARY_TYPE = bytes if _PY3 else str


class _FFIPlaceholder:
    def __init__(self, cause=None):
        object.__setattr__(self, '_cause', cause)

    def __getattr__(self, name):
        raise ImportError(
            "wolfssl._ffi is not available. The CFFI bindings have not been "
            "compiled. If you installed wolfssl via pip, the build may have "
            "failed silently. Try reinstalling with: "
            "pip install --no-binary wolfssl wolfssl"
        ) from self._cause


def t2b(string):
    """
    Converts text to binary.
    """
    if isinstance(string, _BINARY_TYPE):
        return string
    return _TEXT_TYPE(string).encode("utf-8")