/*

  * 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.shiro.crypto.hash;

 import org.apache.shiro.codec.Base64;

 import org.apache.shiro.codec.Hex;

 /**

  * Generates an SHA-256 Hash from a given input <tt>source</tt> with an optional <tt>salt</tt> and hash iterations.

  * <p/>

  * See the {@link SimpleHash SimpleHash} parent class JavaDoc for a detailed explanation of Hashing

  * techniques and how the overloaded constructors function.

  * <p/>

  * <b>JDK Version Note</b> - Attempting to instantiate this class on JREs prior to version 1.4.0 will throw

  * an {@link IllegalStateException IllegalStateException}

  *

  * @since 0.9

  */

 public class Sha256Hash extends SimpleHash {

     //TODO - complete JavaDoc

     public static final String ALGORITHM_NAME = "SHA-256";

     public Sha256Hash() {

         super(ALGORITHM_NAME);

     }

     public Sha256Hash(Object source) {

         super(ALGORITHM_NAME, source);

     }

     public Sha256Hash(Object source, Object salt) {

         super(ALGORITHM_NAME, source, salt);

     }

     public Sha256Hash(Object source, Object salt, int hashIterations) {

         super(ALGORITHM_NAME, source, salt, hashIterations);

     }

     public static Sha256Hash fromHexString(String hex) {

         Sha256Hash hash = new Sha256Hash();

         hash.setBytes(Hex.decode(hex));

         return hash;

     }

     public static Sha256Hash fromBase64String(String base64) {

         Sha256Hash hash = new Sha256Hash();

         hash.setBytes(Base64.decode(base64));

         return hash;

     }

 }