com.hypersocket.auth.PasswordEncryptionService.java Source code

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Here is the source code for com.hypersocket.auth.PasswordEncryptionService.java

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/*******************************************************************************
 * Copyright (c) 2013 Hypersocket Limited.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the GNU Public License v3.0
 * which accompanies this distribution, and is available at
 * http://www.gnu.org/licenses/gpl.html
 ******************************************************************************/
package com.hypersocket.auth;

import java.security.NoSuchAlgorithmException;
import java.security.SecureRandom;
import java.security.spec.InvalidKeySpecException;
import java.security.spec.KeySpec;
import java.util.Arrays;

import javax.crypto.SecretKeyFactory;
import javax.crypto.spec.PBEKeySpec;

import org.springframework.stereotype.Service;

@Service
public class PasswordEncryptionService {

    public boolean authenticate(char[] attemptedPassword, byte[] encryptedPassword, byte[] salt,
            PasswordEncryptionType type) throws NoSuchAlgorithmException, InvalidKeySpecException {
        // Encrypt the clear-text password using the same salt that was used to
        // encrypt the original password
        byte[] encryptedAttemptedPassword = getEncryptedPassword(attemptedPassword, salt, type);

        // Authentication succeeds if encrypted password that the user entered
        // is equal to the stored hash
        return Arrays.equals(encryptedPassword, encryptedAttemptedPassword);
    }

    public byte[] getEncryptedPassword(char[] password, byte[] salt, PasswordEncryptionType type)
            throws NoSuchAlgorithmException, InvalidKeySpecException {

        KeySpec spec = new PBEKeySpec(password, salt, type.getIterations(), type.getKeyLength());

        SecretKeyFactory f = SecretKeyFactory.getInstance(type.toString());

        return f.generateSecret(spec).getEncoded();
    }

    public byte[] generateSalt() throws NoSuchAlgorithmException {
        // VERY important to use SecureRandom instead of just Random
        SecureRandom random = SecureRandom.getInstance("SHA1PRNG");

        // Generate a 8 byte (64 bit) salt as recommended by RSA PKCS5
        byte[] salt = new byte[8];
        random.nextBytes(salt);

        return salt;
    }

}