Java tutorial
/** * Copyright (C) 2012-2015 the original author or authors. * * 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 ninja.utils; import javax.crypto.Mac; import javax.crypto.spec.SecretKeySpec; import org.apache.commons.codec.binary.Hex; import com.google.inject.Inject; import com.google.inject.Singleton; @Singleton public class Crypto { private final String applicationSecret; /** * Secret is a secret key. Usually something like: * "Fxu6U5BTGIJZ06c8bD1xkhHc3Ct5JZXlst8tJ1K5uJJPaLdceDo6CUz0iWpjjQUY". * * @param applicationSecret * the secret to use for signing. * @param random * the random generator to be used for generating the secret * => usually new Random(), but can also be set to e.g. new Random(1) to * test the function. */ @Inject public Crypto(NinjaProperties ninjaProperties) { this.applicationSecret = ninjaProperties.getOrDie(NinjaConstant.applicationSecret); } public String signHmacSha1(String message) { return signHmacSha1(message, applicationSecret); } private String signHmacSha1(String value, String key) { try { // Get an hmac_sha1 key from the raw key bytes byte[] keyBytes = key.getBytes(); SecretKeySpec signingKey = new SecretKeySpec(keyBytes, "HmacSHA1"); // Get an hmac_sha1 Mac instance and initialize with the signing key Mac mac = Mac.getInstance("HmacSHA1"); mac.init(signingKey); // Compute the hmac on input data bytes byte[] rawHmac = mac.doFinal(value.getBytes()); // Convert raw bytes to Hex byte[] hexBytes = new Hex().encode(rawHmac); // Covert array of Hex bytes to a String return new String(hexBytes, "UTF-8"); } catch (Exception e) { throw new RuntimeException(e); } } }