org.springframework.security.crypto.password.PasswordEncoder.java Source code

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Here is the source code for org.springframework.security.crypto.password.PasswordEncoder.java

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/*
 * Copyright 2011-2016 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
 *
 *      https://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.password;

/**
 * Service interface for encoding passwords.
 *
 * The preferred implementation is {@code BCryptPasswordEncoder}.
 *
 * @author Keith Donald
 */
public interface PasswordEncoder {

    /**
     * Encode the raw password. Generally, a good encoding algorithm applies a SHA-1 or
     * greater hash combined with an 8-byte or greater randomly generated salt.
     */
    String encode(CharSequence rawPassword);

    /**
     * Verify the encoded password obtained from storage matches the submitted raw
     * password after it too is encoded. Returns true if the passwords match, false if
     * they do not. The stored password itself is never decoded.
     *
     * @param rawPassword the raw password to encode and match
     * @param encodedPassword the encoded password from storage to compare with
     * @return true if the raw password, after encoding, matches the encoded password from
     * storage
     */
    boolean matches(CharSequence rawPassword, String encodedPassword);

    /**
     * Returns true if the encoded password should be encoded again for better security,
     * else false. The default implementation always returns false.
     * @param encodedPassword the encoded password to check
     * @return true if the encoded password should be encoded again for better security,
     * else false.
     */
    default boolean upgradeEncoding(String encodedPassword) {
        return false;
    }
}