/*
 * 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.
 */
package org.springframework.security.crypto.bcrypt;

import java.security.SecureRandom;
import java.util.regex.Pattern;

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 Pattern BCRYPT_PATTERN = Pattern.compile("\\A\\$2a?\\$\\d\\d\\$[./0-9A-Za-z]{53}");

    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) {
        if (encodedPassword == null || encodedPassword.length() == 0) {
            throw new IllegalArgumentException("Encoded password cannot be null or empty");
        }

        if (!BCRYPT_PATTERN.matcher(encodedPassword).matches()) {
            throw new IllegalArgumentException("Encoded password does not look like BCrypt");
        }

        return BCrypt.checkpw(rawPassword.toString(), encodedPassword);
    }
}
