com.jingtum.core.utils.Sha512 Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of sdk Show documentation
Jingtum SDK
The newest version!
/*
 * Copyright www.jingtum.com Inc. 
 * 
 * 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 com.jingtum.core.utils;

import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

public class Sha512 {
    MessageDigest messageDigest;

    public Sha512() {
        try {
        	messageDigest = MessageDigest.getInstance("SHA-512");
        } catch (NoSuchAlgorithmException e) {
            throw new RuntimeException(e);
        }
    }

    public Sha512(byte[] start) {
        this();
        add(start);
    }

    public Sha512 add(byte[] bytes) {
        messageDigest.update(bytes);
        return this;
    }

    public Sha512 add32(int i) {
        messageDigest.update((byte) ((i >>> 24) & 0xFF));
        messageDigest.update((byte) ((i >>> 16) & 0xFF));
        messageDigest.update((byte) ((i >>> 8)  & 0xFF));
        messageDigest.update((byte) ((i)        & 0xFF));
        return this;
    }

    private byte[] finishTaking(int size) {
        byte[] hash = new byte[size];
        System.arraycopy(messageDigest.digest(), 0, hash, 0, size);
        return hash;
    }

    public byte[] finish128() {
        return finishTaking(16);
    }

    public byte[] finish256() {
        return finishTaking(32);
    }

    public byte[] finish() {
        return messageDigest.digest();
    }
}