pub unsafe extern "C" fn ECDH_compute_key( out: *mut c_void, outlen: usize, pub_key: *const EC_POINT, priv_key: *const EC_KEY, kdf: Option<unsafe extern "C" fn(in_: *const c_void, inlen: usize, out: *mut c_void, outlen: *mut usize) -> *mut c_void>) -> c_int
