Fix bug #653830 - Cannot sign data with embedded NULs.
Fix bug #653830 - Cannot sign data with embedded NULs.

The length od the data passed to the corresponding C functions should not be
determined by strlen(), but directly taken from Python using '#' format
specifier to PyArg_ParseTuple.


harnesscloud/remyroy-pyopenssl-shutdown-fix,harnesscloud/remyroy-pyopenssl-shutdown-fix