Java Salt Value Create generateSaltedPassword(final String password, byte[] salt, int iterationsCount, String hmacName)

Description

Generates salted password.

License

Open Source License

Parameter

Parameter	Description
password	Clear form password, i.e. what user typed
salt	Salt to be used
iterationsCount	Iterations for 'salting'
hmacName	HMAC to be used

Exception

Parameter	Description
InvalidKeyException	if internal error occur while working with SecretKeySpec
NoSuchAlgorithmException	if hmacName is not supported by the java

Return

salted password

Declaration

public static byte[] generateSaltedPassword(final String password,
        byte[] salt, int iterationsCount, String hmacName)
        throws InvalidKeyException, NoSuchAlgorithmException 

Method Source Code

//package com.java2s;
/*/*  www .  ja va 2s . c o  m*/
 * Copyright 2016 Ognyan Bankov
 * <p>
 * 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
 * <p>
 * http://www.apache.org/licenses/LICENSE-2.0
 * <p>
 * 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.
 */

import javax.crypto.Mac;
import javax.crypto.spec.SecretKeySpec;
import java.nio.charset.StandardCharsets;
import java.security.InvalidKeyException;

import java.security.NoSuchAlgorithmException;

public class Main {
    private static final byte[] INT_1 = new byte[] { 0, 0, 0, 1 };

    /**
     * Generates salted password.
     *
     * @param password        Clear form password, i.e. what user typed
     * @param salt            Salt to be used
     * @param iterationsCount Iterations for 'salting'
     * @param hmacName        HMAC to be used
     * @return salted password
     * @throws InvalidKeyException      if internal error occur while working with SecretKeySpec
     * @throws NoSuchAlgorithmException if hmacName is not supported by the java
     */
    public static byte[] generateSaltedPassword(final String password,
            byte[] salt, int iterationsCount, String hmacName)
            throws InvalidKeyException, NoSuchAlgorithmException {

        Mac mac = createHmac(password.getBytes(StandardCharsets.US_ASCII),
                hmacName);

        mac.update(salt);
        mac.update(INT_1);
        byte[] result = mac.doFinal();

        byte[] previous = null;
        for (int i = 1; i < iterationsCount; i++) {
            mac.update(previous != null ? previous : result);
            previous = mac.doFinal();
            for (int x = 0; x < result.length; x++) {
                result[x] ^= previous[x];
            }
        }

        return result;
    }

    /**
     * Creates HMAC
     *
     * @param keyBytes key
     * @param hmacName HMAC name
     * @return Mac
     * @throws InvalidKeyException      if internal error occur while working with SecretKeySpec
     * @throws NoSuchAlgorithmException if hmacName is not supported by the java
     */
    public static Mac createHmac(final byte[] keyBytes, String hmacName)
            throws NoSuchAlgorithmException, InvalidKeyException {

        SecretKeySpec key = new SecretKeySpec(keyBytes, hmacName);
        Mac mac = Mac.getInstance(hmacName);
        mac.init(key);
        return mac;
    }
}

Related

1. generateSalt(int byteSize)
2. generateSalt(int length)
3. generateSalt(int numberOfBytes)
4. generateSalt(int numBytes)
5. generateSaltAESPBKDF2()
6. generateSaltedSHAHash(String algorithm, String input, String salt)
7. generateSaltOfLength(int length)
8. getMd5Salt()
9. getNewSalt()