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The AWS SDK for Java with support for OSGi. The AWS 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 2013-2016 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.internal.crypto;

import static com.amazonaws.services.s3.model.CryptoMode.StrictAuthenticatedEncryption;

import com.amazonaws.auth.AWSCredentialsProvider;
import com.amazonaws.services.kms.AWSKMSClient;
import com.amazonaws.services.s3.internal.S3Direct;
import com.amazonaws.services.s3.model.CryptoConfiguration;
import com.amazonaws.services.s3.model.EncryptionMaterialsProvider;

/**
 * Strict Authenticated encryption (AE) cryptographic module for the S3
 * encryption client.
 */
class S3CryptoModuleAEStrict extends S3CryptoModuleAE {
    /**
     * @param cryptoConfig a read-only copy of the crypto configuration.
     */
    S3CryptoModuleAEStrict(AWSKMSClient kms, S3Direct s3,
            AWSCredentialsProvider credentialsProvider,
            EncryptionMaterialsProvider encryptionMaterialsProvider,
            CryptoConfiguration cryptoConfig) {
        super(kms, s3, credentialsProvider, encryptionMaterialsProvider,
                cryptoConfig);
        if (cryptoConfig.getCryptoMode() != StrictAuthenticatedEncryption)
            throw new IllegalArgumentException();
    }

    protected final boolean isStrict() {
        return true;
    }

    protected void securityCheck(ContentCryptoMaterial cekMaterial,
            S3ObjectWrapper retrieved) {
        if (!ContentCryptoScheme.AES_GCM.equals(cekMaterial.getContentCryptoScheme())) {
            throw new SecurityException("S3 object [bucket: "
                    + retrieved.getBucketName() + ", key: "
                    + retrieved.getKey()
                    + "] not encrypted using authenticated encryption");
        }
    }
}