de.alpharogroup.crypto.sha.Hasher.java Source code

Introduction

Here is the source code for de.alpharogroup.crypto.sha.Hasher.java

Source

/**
 * Copyright (C) 2007 Asterios Raptis
 *
 * 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 de.alpharogroup.crypto.sha;

import java.io.UnsupportedEncodingException;
import java.nio.charset.Charset;
import java.security.InvalidKeyException;
import java.security.MessageDigest;
import java.security.NoSuchAlgorithmException;

import javax.crypto.BadPaddingException;
import javax.crypto.Cipher;
import javax.crypto.IllegalBlockSizeException;
import javax.crypto.NoSuchPaddingException;

import org.apache.commons.codec.binary.Base64;

import de.alpharogroup.crypto.aes.HexEncryptor;
import de.alpharogroup.crypto.algorithm.HashAlgorithm;
import de.alpharogroup.random.Constants;
import de.alpharogroup.random.RandomExtensions;

/**
 * The Class Hasher.
 *
 * @author Asterios Raptis
 */
public class Hasher {

    /**
     * Gets the random salt.
     *
     * @param length
     *            the length
     * @param charset
     *            the charset
     * @return the random salt
     */
    public static byte[] getRandomSalt(final int length, final Charset charset) {
        return RandomExtensions.getRandomString(Constants.LCUCCHARSWN, length).getBytes(charset);
    }

    /**
     * Hash.
     *
     * @param hashIt
     *            the hash it
     * @param salt
     *            the salt
     * @param hashAlgorithm
     *            the hash algorithm
     * @param charset
     *            the charset
     * @return the string
     * @throws NoSuchAlgorithmException
     *             is thrown if instantiation of the MessageDigest object fails.
     */
    public static String hash(final String hashIt, final String salt, final HashAlgorithm hashAlgorithm,
            final Charset charset) throws NoSuchAlgorithmException {
        final MessageDigest messageDigest = MessageDigest.getInstance(hashAlgorithm.getAlgorithm());
        messageDigest.reset();
        messageDigest.update(salt.getBytes(charset));
        return new String(messageDigest.digest(hashIt.getBytes(charset)), charset);
    }

    public static String hashAndBase64(final String hashIt, final String salt, final HashAlgorithm hashAlgorithm,
            final Charset charset) throws NoSuchAlgorithmException {
        final String hashedAndBase64 = new Base64()
                .encodeToString(hash(hashIt, salt, hashAlgorithm, charset).getBytes(charset));
        return hashedAndBase64;
    }

    /**
     * Hash and hex.
     *
     * @param hashIt
     *            the hash it
     * @param salt
     *            the salt
     * @param hashAlgorithm
     *            the hash algorithm
     * @param charset
     *            the charset
     * @return the string
     * @throws NoSuchAlgorithmException
     *             is thrown if instantiation of the MessageDigest object fails.
     * @throws UnsupportedEncodingException
     *             is thrown by get the byte array of the private key String object fails.
     * @throws NoSuchPaddingException
     *             is thrown if instantiation of the cypher object fails.
     * @throws InvalidKeyException
     *             the invalid key exception is thrown if initialization of the cypher object fails.
     * @throws BadPaddingException
     *             is thrown if {@link Cipher#doFinal(byte[])} fails.
     * @throws IllegalBlockSizeException
     *             is thrown if {@link Cipher#doFinal(byte[])} fails.
     */
    public static String hashAndHex(final String hashIt, final String salt, final HashAlgorithm hashAlgorithm,
            final Charset charset) throws NoSuchAlgorithmException, InvalidKeyException,
            UnsupportedEncodingException, NoSuchPaddingException, IllegalBlockSizeException, BadPaddingException {
        final HexEncryptor hexEncryptor = new HexEncryptor();
        return hexEncryptor.encrypt(hash(hashIt, salt, hashAlgorithm, charset));
    }

}