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Ahome-Tooling-Common is common integfaces and utility classes for Ahome Tooling Projects.

There is a newer version: 2.0.7-RELEASE

/*
   Copyright (c) 2014,2015,2016 Ahome' Innovation Technologies. All rights reserved.

   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 com.ait.tooling.common.api.hash;

import java.io.Serializable;
import java.util.Objects;
import java.util.Random;

import com.ait.tooling.common.api.java.util.StringOps;

public final class Hasher implements IHasher, Serializable
{
    private static final long serialVersionUID = -2752202273489654010L;

    private final Random      m_rand           = new Random();

    private final IHash512    m_hash;

    public Hasher(final IHash512 hash)
    {
        m_hash = Objects.requireNonNull(hash);
    }

    @Override
    public String sha512(final String text)
    {
        return m_hash.sha512(Objects.requireNonNull(text));
    }

    @Override
    public String sha512(final String text, final String salt)
    {
        return sha512(Objects.requireNonNull(text), Objects.requireNonNull(salt), m_rand.nextInt((salt.length() + 1) * 2));
    }

    @Override
    public String sha512(String text, String salt, int iter)
    {
        Objects.requireNonNull(text);

        Objects.requireNonNull(salt);

        if (iter < 2)
        {
            return sha512(text + salt);
        }
        if ((iter < 5) || (iter > 25))
        {
            iter = 13;
        }
        for (int i = 0; i < iter; i++)
        {
            if ((i % 2) == 0)
            {
                text = text + salt;
            }
            else
            {
                text = salt + text;
            }
            text = StringOps.reverse(sha512(text));
        }
        return text;
    }
}