se.rapid.security.BCryptPasswordEncoder.java Source code

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Here is the source code for se.rapid.security.BCryptPasswordEncoder.java

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package se.rapid.security;

/*
 * Copyright 2002-2011 the original author or authors.
 *
 * 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.
 */

import java.security.SecureRandom;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.springframework.dao.DataAccessException;
import org.springframework.security.crypto.password.PasswordEncoder;

/**
 * Implementation of PasswordEncoder that uses the BCrypt strong hashing function. Clients can optionally supply a
 * "strength" (a.k.a. log rounds in BCrypt) and a SecureRandom instance. The larger the strength parameter the more work
 * will have to be done (exponentially) to hash the passwords.  The default value is 10.
 *
 * @author Dave Syer
 *
 */
public class BCryptPasswordEncoder implements PasswordEncoder {

    private static final Logger logger = LoggerFactory.getLogger(BCryptPasswordEncoder.class);
    private final int strength;
    private final SecureRandom random;

    public BCryptPasswordEncoder() {
        this(-1);
    }

    /**
     * @param strength the log rounds to use
     */
    public BCryptPasswordEncoder(int strength) {
        this(strength, null);
    }

    /**
     * @param strength the log rounds to use
     * @param random the secure random instance to use
     *
     */
    public BCryptPasswordEncoder(int strength, SecureRandom random) {
        this.strength = strength;
        this.random = random;
    }

    public String encode(CharSequence rawPassword) {
        String salt;
        if (strength > 0) {
            if (random != null) {
                salt = BCrypt.gensalt(strength, random);
            } else {
                salt = BCrypt.gensalt(strength);
            }
        } else {
            salt = BCrypt.gensalt();
        }
        return BCrypt.hashpw(rawPassword.toString(), salt);
    }

    public boolean matches(CharSequence rawPassword, String encodedPassword) {
        return BCrypt.checkpw(rawPassword.toString(), encodedPassword);
    }

    public String encodePassword(String rawPass, Object salt) throws DataAccessException {
        logger.debug("Encoding password.");
        return BCrypt.hashpw(rawPass, BCrypt.gensalt());
    }

    public boolean isPasswordValid(String encPass, String rawPass, Object salt) throws DataAccessException {
        logger.debug("Validating password.");
        return BCrypt.checkpw(rawPass, encPass);
    }

}