Function openssl_sys::PEM_write_bio_ECPrivateKey

pub unsafe extern fn PEM_write_bio_ECPrivateKey(bio: *mut BIO,
                                                key: *mut EC_KEY,
                                                cipher: *const EVP_CIPHER,
                                                kstr: *mut c_uchar,
                                                klen: c_int,
                                                callback: Option<PasswordCallback>,
                                                user_data: *mut c_void)
                                                -> c_int