| /** |
| * 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.atlas.utils; |
| |
| |
| import java.security.MessageDigest; |
| import java.security.NoSuchAlgorithmException; |
| |
| public class SHA256Utils{ |
| |
| |
| private static final ThreadLocal<MessageDigest> DIGESTER_FACTORY = |
| new ThreadLocal<MessageDigest>() { |
| @Override |
| protected MessageDigest initialValue() { |
| try { |
| return MessageDigest.getInstance("SHA-256"); |
| } catch (NoSuchAlgorithmException e) { |
| throw new RuntimeException(e); |
| } |
| } |
| }; |
| |
| /** |
| * Create a thread local SHA256 digester. |
| */ |
| |
| public static MessageDigest getDigester() { |
| MessageDigest digester = DIGESTER_FACTORY.get(); |
| digester.reset(); |
| return digester; |
| } |
| |
| public static String toString(byte[] hash) { |
| try{ |
| StringBuffer hexString = new StringBuffer(); |
| |
| for (int i = 0; i < hash.length; i++) { |
| String hex = Integer.toHexString(0xff & hash[i]); |
| if(hex.length() == 1) hexString.append('0'); |
| hexString.append(hex); |
| } |
| |
| return hexString.toString(); |
| } catch(Exception ex){ |
| throw new RuntimeException(ex); |
| } |
| } |
| |
| |
| |
| } |