| /* |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you under the Apache License, Version 2.0 (the |
| * "License"); you may not use this file except in compliance |
| * with the License. You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| package org.apache.storm.security.auth.workertoken; |
| |
| import java.security.InvalidKeyException; |
| import java.security.NoSuchAlgorithmException; |
| import javax.crypto.Mac; |
| import javax.crypto.SecretKey; |
| |
| /** |
| * Provides everything needed to sign a worker token with a secret key. |
| */ |
| class WorkerTokenSigner { |
| /** |
| * The name of the hashing algorithm. |
| */ |
| static final String DEFAULT_HMAC_ALGORITHM = "HmacSHA256"; |
| |
| /** |
| * A thread local store for the Macs. |
| */ |
| private static final ThreadLocal<Mac> threadLocalMac = |
| ThreadLocal.withInitial(() -> { |
| try { |
| return Mac.getInstance(DEFAULT_HMAC_ALGORITHM); |
| } catch (NoSuchAlgorithmException nsa) { |
| throw new IllegalArgumentException("Can't find " + DEFAULT_HMAC_ALGORITHM + " algorithm."); |
| } |
| }); |
| |
| /** |
| * Compute HMAC of the identifier using the secret key and return the output as password. |
| * |
| * @param identifier the bytes of the identifier |
| * @param key the secret key |
| * @return the bytes of the generated password |
| */ |
| static byte[] createPassword(byte[] identifier, SecretKey key) { |
| Mac mac = threadLocalMac.get(); |
| try { |
| mac.init(key); |
| } catch (InvalidKeyException ike) { |
| throw new IllegalArgumentException("Invalid key to HMAC computation", ike); |
| } |
| return mac.doFinal(identifier); |
| } |
| } |