Java tutorial
/* * Copyright (C) 2015 Square, Inc. * * Licensed 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 keywhiz.testing; import com.google.common.base.Throwables; import com.google.common.io.Resources; import com.sun.crypto.provider.SunJCE; import java.io.IOException; import java.io.InputStream; import java.security.KeyStore; import java.security.KeyStoreException; import java.security.NoSuchAlgorithmException; import java.security.Provider; import java.security.Security; import java.security.UnrecoverableKeyException; import java.security.cert.CertificateException; import javax.crypto.SecretKey; public class ContentCryptographers { private static SecretKey derivationKey; private ContentCryptographers() { } public static SecretKey derivationKey() { if (derivationKey != null) { return derivationKey; } char[] password = "CHANGE".toCharArray(); try (InputStream in = Resources.getResource("derivation.jceks").openStream()) { KeyStore keyStore = KeyStore.getInstance("JCEKS"); keyStore.load(in, password); derivationKey = (SecretKey) keyStore.getKey("basekey", password); } catch (CertificateException | UnrecoverableKeyException | KeyStoreException | NoSuchAlgorithmException | IOException e) { throw Throwables.propagate(e); } return derivationKey; } public static Provider provider() { Provider provider = new SunJCE(); if (Security.getProvider(provider.getName()) == null) { Security.addProvider(provider); } return provider; } }