libcrypto.sk_set.argtypes = (c_void_p, c_int, c_void_p)
libcrypto.sk_set.restype = c_void_p
libcrypto.sk_value.argtypes = (c_void_p, c_int)
libcrypto.sk_value.restype = c_void_p
libcrypto.sk_set.argtypes = (c_void_p, c_int, c_void_p)
libcrypto.sk_set.restype = c_void_p
libcrypto.sk_value.argtypes = (c_void_p, c_int)
libcrypto.sk_value.restype = c_void_p