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/*
 * Copyright 2013-2014 Amazon.com, Inc. or its affiliates. All Rights Reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License").
 * You may not use this file except in compliance with the License.
 * A copy of the License is located at
 *
 *  http://aws.amazon.com/apache2.0
 *
 * or in the "license" file accompanying this file. This file 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.amazonaws.services.s3.model;

/**
 * Denotes the different cryptographic modes available for securing an S3 object
 * via client-side encryption. Crypto mode can be configured via
 * {@link CryptoConfiguration} when the S3 encryption client is constructed.
 */
public enum CryptoMode {
    /** Encryption-only mode using AES/CBC. */
    EncryptionOnly,
    /**
     * Authenticated encryption mode using AES/GCM, AESWrap, etc. Please
     * note the limitation on the maximum message size in bytes that can be
     * encrypted under this mode is 2^36-32, or ~64G, due to the security
     * limitation of AES/GCM as recommended by NIST.
     */
    AuthenticatedEncryption,
    /**
     * Strictly enforce the use of authenticated encryption via AES/GCM,
     * AESWrap, etc., and will throw security exception if an S3 object
     * retrieved is found to be not protected using authenticated encryption.
     * This means range-get operation is not supported in this mode, since
     * range-get is not authenticated.
     * 
     * Please note the limitation on the maximum message size in bytes that can
     * be encrypted under this mode is 2^36-32, or ~64G, due to the security
     * limitation of AES/GCM as recommended by NIST.
     */
    StrictAuthenticatedEncryption, ;
}