EVP_MD_CTX mdctx;
EVP_MD_CTX_init(&mdctx)

import ctypes
import ctypes.util
import platform
from os import linesep

libraries = {}

libraries["c"] = ctypes.CDLL(ctypes.util.find_library("c"))

if platform.system() != "Windows":
    libraries["ssl"] = ctypes.CDLL(ctypes.util.find_library("ssl"))
else:
    libraries["ssl"] = ctypes.CDLL(ctypes.util.find_library("libeay32"))

EVP_MD_CTX_init = libraries['ssl'].EVP_MD_CTX_init
EVP_MD_CTX_init.restype = ctypes.c_void_p
EVP_MD_CTX_init.argtypes = [ctypes.c_void_p]