com.amazonaws.services.s3.model.EncryptionMaterialsProvider Maven / Gradle / Ivy

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The Amazon Web Services SDK for Java provides Java APIs for building software on AWS' cost-effective, scalable, and reliable infrastructure products. The AWS Java SDK allows developers to code against APIs for all of Amazon's infrastructure web services (Amazon S3, Amazon EC2, Amazon SQS, Amazon Relational Database Service, Amazon AutoScaling, etc).

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/*
 * Copyright 2012-2014 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;

/**
 * Interface for providing encryption materials.
 * Implementations are free to use any strategy for providing encryption
 * materials, such as simply providing static material that doesn't change,
 * or more complicated implementations, such as integrating with existing
 * key management systems.
 */
public interface EncryptionMaterialsProvider extends EncryptionMaterialsAccessor {
    
    /**
     * Returns EncryptionMaterials which the caller can use for encryption.
     * Each implementation of EncryptionMaterialsProvider can choose its own
     * strategy for loading encryption material.  For example, an
     * implementation might load encryption material from an existing key
     * management system, or load new encryption material when keys are
     * rotated.
     *
     * @return EncryptionMaterials which the caller can use to encrypt or
     * decrypt data.
     */
    public EncryptionMaterials getEncryptionMaterials();

    /**
     * Forces this encryption materials provider to refresh its encryption
     * material.  For many implementations of encryption materials provider,
     * this may simply be a no-op, such as any encryption materials provider
     * implementation that vends static/non-changing encryption material.
     * For other implementations that vend different encryption material
     * throughout their lifetime, this method should force the encryption
     * materials provider to refresh its encryption material.
     */
    public void refresh();
}