/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.apache.accumulo.core.spi.crypto;

import java.util.Map;

/**
 * A self-contained cryptographic service. All on disk encryption and decryption will take place
 * through this interface. Each implementation must implement a {@link FileEncrypter} for encryption
 * and a {@link FileDecrypter} for decryption.
 *
 * @since 2.0.0
 * @see org.apache.accumulo.core.spi
 */
public interface CryptoService {

  /**
   * Initialize CryptoService. This should only be called once.
   */
  void init(Map<String,String> conf) throws CryptoException;

  /**
   * Initialize the FileEncrypter for the environment and return. This will get called once per
   * R-File or Write Ahead Log. FileEncrypter implementation is not expected be called by multiple
   * threads.
   */
  FileEncrypter getFileEncrypter(CryptoEnvironment environment);

  /**
   * Initialize the FileDecrypter for the environment and return. This will get called once per
   * R-File or Write Ahead Log. FileDecrypter implementation must be thread safe.
   */
  FileDecrypter getFileDecrypter(CryptoEnvironment environment);

  /**
   * Runtime Crypto exception
   */
  class CryptoException extends RuntimeException {

    private static final long serialVersionUID = -7588781060677839664L;

    public CryptoException() {}

    public CryptoException(String message) {
      super(message);
    }

    public CryptoException(String message, Throwable cause) {
      super(message, cause);
    }

    public CryptoException(Throwable cause) {
      super(cause);
    }
  }
}
