
software.amazon.awssdk.authcrt.signer.internal.chunkedencoding.AwsS3V4aChunkSigner Maven / Gradle / Ivy
/*
* Copyright 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 software.amazon.awssdk.authcrt.signer.internal.chunkedencoding;
import java.nio.charset.StandardCharsets;
import java.util.Collections;
import software.amazon.awssdk.annotations.SdkInternalApi;
import software.amazon.awssdk.auth.signer.internal.chunkedencoding.AwsChunkSigner;
import software.amazon.awssdk.authcrt.signer.internal.AwsCrt4aSigningAdapter;
import software.amazon.awssdk.crt.auth.signing.AwsSigningConfig;
import software.amazon.awssdk.crt.auth.signing.AwsSigningResult;
import software.amazon.awssdk.utils.BinaryUtils;
/**
* An implementation of AwsChunkSigner that can calculate a Sigv4a compatible chunk signature.
*/
@SdkInternalApi
public class AwsS3V4aChunkSigner implements AwsChunkSigner {
private static final int SIGNATURE_LENGTH = 144;
private final AwsCrt4aSigningAdapter aws4aSigner;
private final AwsSigningConfig signingConfig;
public AwsS3V4aChunkSigner(AwsCrt4aSigningAdapter aws4aSigner, AwsSigningConfig signingConfig) {
this.aws4aSigner = aws4aSigner;
this.signingConfig = signingConfig;
}
@Override
public String signChunk(byte[] chunkData, String previousSignature) {
byte[] chunkSignature = aws4aSigner.signChunk(chunkData,
previousSignature.getBytes(StandardCharsets.UTF_8),
signingConfig);
return new String(chunkSignature, StandardCharsets.UTF_8);
}
@Override
public String signChecksumChunk(byte[] calculatedChecksum, String previousSignature, String checksumHeaderForTrailer) {
AwsSigningResult awsSigningResult =
aws4aSigner.signTrailerHeaders(
Collections.singletonMap(checksumHeaderForTrailer,
Collections.singletonList(BinaryUtils.toBase64(calculatedChecksum))),
previousSignature.getBytes(StandardCharsets.UTF_8),
signingConfig);
return awsSigningResult != null ? new String(awsSigningResult.getSignature(), StandardCharsets.UTF_8) : null;
}
public static int getSignatureLength() {
return SIGNATURE_LENGTH;
}
}
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