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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 2010-2014 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;

import java.security.KeyPair;
import java.util.HashMap;
import java.util.Map;

import javax.crypto.SecretKey;

/**
 * The "key encrypting key" materials used in encrypt/decryption. These
 * materials may be either an asymmetric key pair or a symmetric key but not
 * both.
 */
public class EncryptionMaterials {
    private final KeyPair keyPair;
    private final SecretKey symmetricKey;

    /**
     * Constructs a new EncryptionMaterials object, storing an asymmetric key pair.
     * 
     * @param keyPair
     *      The asymmetric key pair to be stored in this EncryptionMaterials object.
     */
    public EncryptionMaterials(KeyPair keyPair) {
        this(keyPair, null);
    }

    /**
     * Constructs a new EncryptionMaterials object, storing a symmetric key.
     * 
     * @param symmetricKey
     *      The symmetric key to be stored in this EncryptionMaterials object.
     */
    public EncryptionMaterials(SecretKey symmetricKey) {
        this(null, symmetricKey);
    }

    /**
     * Base constructor for the EncryptionMaterials object.  This is not publicly visible since
     * it should not be possible to create an EncryptionMaterials object that contains both an
     * asymmetric key pair and a symmetric key.
     */
    protected EncryptionMaterials(KeyPair keyPair, SecretKey symmetricKey) {
        this.keyPair = keyPair;        
        this.symmetricKey = symmetricKey;
    }

    /**
     * Returns the key pair stored in this EncryptionMaterials object.
     * 
     * @return the key pair stored in this EncryptionMaterials object.
     *      
     */
    public KeyPair getKeyPair() {
        return this.keyPair;
    }    

    /**
     * Returns the symmetric key stored in this EncryptionMaterials object.
     * 
     * @return the symmetric key stored in this EncryptionMaterials object.
     */
    public SecretKey getSymmetricKey() {
        return this.symmetricKey;
    }

    /**
     * Returns an empty map since the EncryptionMaterials base class does not have extra materials information.
     * Subclasses may override this method.
     * 
     * @return an empty  map
     */
    public Map getMaterialsDescription() {
        return new HashMap();
    }

    /**
     * Returns null since the EncryptionMaterials base class does not have a materials accessor.
     * Subclasses may override this method.
     * 
     * @return null
     */
    public EncryptionMaterialsAccessor getAccessor() {
        return null;
    }
}