Merge feature/master/checksum-reuse #6452
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* Reuse computed checksums across retries This commit adds the ability to reuse previously computed checksums for a request across retries. This ensures that if a request data stream is modified between attempts that the server will reject the request. As part of this change, the `http-auth-spi` package has been updated to expose a new interface: `PayloadChecksumStore`. This is a simple storage interface that allows signers to store and retrieve computed checksums. Additionally, a new `SignerProperty` is introduced, `SdkInternalHttpSignerProperty.CHECKSUM_CACHE` so that signers and their callers can access this cache. Note that both the interface and associated signer property are `@SdkProtectedApi` and not intended to be used by non-SDK consumers of `http-auth-spi`. Finally, this adds a dependency on `checksums-spi` for `http-auth-spi`. * Update core/sdk-core/src/main/java/software/amazon/awssdk/core/internal/http/pipeline/stages/SigningStage.java Co-authored-by: David Ho <[email protected]> * Review comments --------- Co-authored-by: David Ho <[email protected]>
* Reuse computed checkums for async payloads This is a continuation of #6413 that adds support for checksum reuse on async payloads. Additionally, this commit renames references to "ChecksumCache" to "ChecksumStore". * Fix cross module issue
* Reuse checksums in legacy signing codepath This commit adds support for reusing calculated payload checksums over retries in the legacy (i.e. non-SRA) signing codepaths. * S3 testing with non-SRA
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S-Saranya1
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Sep 29, 2025
This doesn't correspond to a flexible checksum value, so this is not required.
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Motivation and Context
This update enables reusing the initially computed payload checksum of a request across all request attempts. This ensures that even if the content is changed from one attempt to the next, the checksum included in the request will remain the same and the request will be rejected by the service.
This PR merges the feature branch which contains previously reviewed commits:
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Testing
Screenshots (if appropriate)
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mvn installsucceedsscripts/new-changescript and following the instructions. Commit the new file created by the script in.changes/next-releasewith your changes.License