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Get a native string type representing of the given CFFI ``char*`` object.
:param charp: A C-style string represented using CFFI.
:return: :class:`str`
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Convert an OpenSSL library failure into a Python exception.
When a call to the native OpenSSL library fails, this is usually signalled
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associated with the current thread. The err library provides functions to
obtain these error codes and textual error messages.
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Create an assert function that uses :func:`exception_from_error_queue` to
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If *ok* is not True, retrieve the error from OpenSSL and raise it.
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Convert :py:class:`bytes` or :py:class:`unicode` to the native
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Convert a Python string to a :py:class:`bytes` string identifying the same
path and which can be passed into an OpenSSL API accepting a filename.
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:return: An instance of :py:class:`bytes`.
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If ``obj`` is text, emit a warning that it should be bytes instead and try
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