Function openssl_sys::PEM_write_bio_PKCS8PrivateKey

pub unsafe extern fn PEM_write_bio_PKCS8PrivateKey(bio: *mut BIO,
                                                   pkey: *mut EVP_PKEY,
                                                   cipher: *const EVP_CIPHER,
                                                   kstr: *mut c_char,
                                                   klen: c_int,
                                                   callback: Option<PasswordCallback>,
                                                   user_data: *mut c_void)
                                                   -> c_int