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The AWS Java SDK for Amazon S3 module holds the client classes that are used for communicating with Amazon Simple Storage Service
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/*
* Copyright 2020-2024 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;
/**
* Static utility methods to assist with cryptographic tasks
*/
public final class CryptoUtils {
private static final String AES_GCM_CIPHER_ALGORITHM = "AES/GCM/NoPadding";
private static final String AES_CTR_CIPHER_ALGORITHM = "AES/CTR/NoPadding";
private CryptoUtils() {
}
/**
* Normalizes the value of a content algorithm for the purposes of authentication. Currently only maps AES/CTR
* to AES/GCM to enable ranged gets to pass validation for those modes.
*/
public static String normalizeContentAlgorithmForValidation(String contentAlgorithm) {
if (AES_CTR_CIPHER_ALGORITHM.equals(contentAlgorithm)) {
return AES_GCM_CIPHER_ALGORITHM;
}
return contentAlgorithm;
}
}
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