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Special Java 1.8+ Library with security related functionality

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/**
 * Copyright (C) 2014-2019 Philip Helger (www.helger.com)
 * philip[at]helger[dot]com
 *
 * 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 com.helger.security.password.hash;

import java.io.Serializable;

import javax.annotation.Nonnull;

import com.helger.commons.annotation.Nonempty;
import com.helger.security.password.salt.IPasswordSalt;

/**
 * Interface for a password hash creator.
 *
 * @author Philip Helger
 */
public interface IPasswordHashCreator extends Serializable
{
  /**
   * @return The name of the algorithm used in this creator. May neither be
   *         null nor empty.
   */
  @Nonnull
  @Nonempty
  String getAlgorithmName ();

  /**
   * @return true if this hash creator requires a salt,
   *         false if not.
   */
  boolean requiresSalt ();

  /**
   * The method to create a message digest hash from a password.
   *
   * @param aSalt
   *        Optional salt to be used. This parameter is only null
   *        for backwards compatibility reasons.
   * @param sPlainTextPassword
   *        Plain text password. May not be null.
   * @return The String representation of the password hash. Must be valid to
   *         encode in UTF-8.
   */
  @Nonnull
  String createPasswordHash (IPasswordSalt aSalt, @Nonnull String sPlainTextPassword);
}