fix(sdk): emit spec-compliant key access in experimental/tdf and delegate Writer - #3944
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📝 WalkthroughWalkthroughThe experimental TDF writer now delegates to ChangesExperimental TDF writer
Estimated code review effort: 4 (Complex) | ~45 minutes Sequence Diagram(s)sequenceDiagram
participant Caller
participant TDFWriter
participant ChunkedWriter
participant XORSplitter
Caller->>TDFWriter: WriteSegment or Finalize
TDFWriter->>ChunkedWriter: Delegate operation
ChunkedWriter->>XORSplitter: Split attributes for key access
XORSplitter-->>ChunkedWriter: Return SDK split results
ChunkedWriter-->>Caller: Return segment or finalize result
Suggested reviewers: Merge Risk: 🔵 Low · up to The change is mergeable with bounded follow-up: test EC key access through the experimental writer and correct the misleading integrity-error documentation. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
✨ Finishing Touches 💡 1🛠️ Fix failing CI checks 💡
📝 Generate docstrings
🧪 Generate unit tests (beta)
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@sdk/experimental/tdf/doc.go`:
- Around line 142-143: Update the Finalize documentation to distinguish
outcomes: success is terminal; a refusal before archive changes, such as
ErrChunkedWriteInFlight, leaves the writer usable and retryable; archive failure
after mutation or close failure leaves it unusable. Preserve the note that
Finalize takes an exclusive lock and cannot overlap with WriteSegment.
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sdk/experimental/tdf/doc.gosdk/experimental/tdf/options.gosdk/experimental/tdf/writer.gosdk/experimental/tdf/writer_test.go
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Pushed a round of fixes from a deeper review pass (agent-assisted, findings verified against the actual code): Fixes
Cleanup
Test coverage
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- 🪄 Fix CodeRabbit comments on this PR
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Inline comments:
In `@sdk/experimental/tdf/keysplit_adapter_test.go`:
- Around line 51-61: Add an EC round-trip test through the experimental Writer
alongside the RSA-only test, using the existing EC test setup and unwrapping
flow where applicable. Use one EC KAS for adapter coverage, or multiple EC KAS
keys to exercise every XOR share.
In `@sdk/experimental/tdf/manifest.go`:
- Line 113: Update the segment-algorithm comment in the manifest documentation
to state that construction rejects algorithms other than GMAC, matching
NewWriter’s accepted algorithm.
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`sdk/experimental/tdf` carried its own copies of the manifest and assertion types -- `Manifest`, `Segment`, `KeyAccess`, `Assertion`, `Statement`, `AssertionKey` and the rest -- structurally identical to the ones in `sdk` but distinct to the type system, so anything crossing the boundary needed conversion. Two copies of the JWT signing and verification logic also had to be kept in step by hand. Replaces both files' definitions with type aliases. `sdk` owns the definitions; this package re-exports them. Every exported name and every method survives: `Assertion.Sign` / `Verify` / `GetHash`, `Statement.UnmarshalJSON`, `AssertionKey.IsEmpty` / `Algorithm`, `AssertionVerificationKeys.Get` / `IsEmpty` and the five `String()` methods all come along with the aliased types, so importers compile unchanged. A manifest produced here can now be handed to the stable SDK without conversion, which is what the follow-up delegation needs. Two deliberate non-aliases: `Policy`, `PolicyBody` and `PolicyAttribute` stay local. `sdk.PolicyObject` is itself exported and could be aliased, but it declares `Body` as an anonymous struct over the unexported `attributeObject`, so `PolicyBody` and `PolicyAttribute` have no sdk names to alias to, and the local ones are not assignable to `Body`. Aliasing `Policy` alone would break every caller that names the other two. For the alias to become possible `sdk` would have to both export the attribute type and give `Body` a named one; that is a separate change. `IntegrityAlgorithm` stays a distinct `int` type. `sdk.IntegrityAlgorithm` is itself `= int`, so no method can be attached to it, and aliasing would silently drop `String()` from this package's public API. The underlying values match, so the two convert freely. `kSplitKeyType`, `kPolicyBindingAlg` and `kGMACPayloadLength` are retained verbatim: this package still builds its own manifests and they have callers in `writer.go` and `key_access.go`. The change that removes those callers must delete these constants too, or they are left unused. (`calculateSignature` was part of this set until #4030 removed it; the integrity helpers here are now `hmacIntegrity`, `segmentIntegrity` and `rootIntegrity`.) No behavior change. The package's existing tests pass unmodified. Signed-off-by: Dave Mihalcik <dmihalcik@virtru.com>
…gate Writer
The experimental writer built its own key access objects, and for EC KAS
keys it built them wrong in three ways at once. It set keyType
`"eccWrapped"`, but `service/kas/access/rewrap.go` dispatches on the exact
string `"ec-wrapped"` and has no case for the other spelling. It derived
the wrapping key with HKDF and then XORed the DEK, where the spec and every
KAS expect AES-GCM under that derived key. And it omitted `schemaVersion`
from the KAO entirely. Any TDF this package produced against an EC KAS was
undecryptable, and nothing in the repo caught it because the package tested
its own output against its own expectations.
The fix is not a patch to that code but its deletion. `key_access.go` (-266)
goes away and `Writer` delegates to `sdk.NewChunkedWriter`, so key access
objects come from `sdk.createKeyAccess` -- the same code path
`SDK.CreateTDF` has always used and that the cross-SDK tests exercise. RSA,
EC, ML-KEM and hybrid wrapping now have exactly one implementation.
`key_access_test.go` (-652) goes with it; equivalent coverage against the
sdk functions landed earlier in this stack, so nothing is lost.
`writer.go` drops from 680 lines to ~292: `Writer` becomes its config plus
an inner `sdk.ChunkedWriter` and a `finalized` flag. Manifest assembly,
segment encryption, integrity hashing and assertion signing all move to the
one implementation. `manifest.go` sheds the `calculateSignature` copy and
the three constants that only its callers needed.
`keysplit_adapter.go` (+60) is why this is a delegation rather than a
rename. `sdk.DefaultKeySplitter` is single-KAS and ignores attributes;
`keysplit.XORSplitter` evaluates the full ABAC boolean expression and
XOR-splits the DEK across every KAS the resulting clauses require. The two
result shapes are field-identical, so the adapter is a straight copy. The
one structural mismatch is where the default KAS enters -- sdk passes it per
`Split` call, keysplit takes it at construction -- so the splitter is built
inside `Split`.
API changes callers will notice
`Finalize` now returns a single `*FinalizeResult` instead of
`(finalBytes, manifest, error)`. Error values are aliases of their sdk
counterparts rather than copies, so `errors.Is` matches under either name.
`ErrUnsupportedRootIntegrityAlgorithm` and `ErrUnsupportedSegmentIntegrityAlgorithm`
are sdk aliases too, for the same reason as the four above: a caller
matching on either name gets the same error.
`WithSegments` no longer requires a contiguous prefix starting at 0.
Indices may be sparse -- a caller mapping fixed index blocks onto S3
multipart uploads writes gaps by construction -- but must still name written
segments in ascending order and may only drop from the end, because that is
the order the payload is laid out in. Dropping a segment from the manifest
does not shrink the archive: every written segment's bytes, including ones
a caller excludes from the manifest, must still be appended when assembling
the final file.
`WithExcludeVersionFromManifest` is deprecated. It was always a no-op: the
manifest builder never read the flag. Omitting `schemaVersion` is how a
reader is told the TDF predates 4.3.0, and such a reader then expects
hex-then-base64 signatures, which are decided per segment at write time,
long before Finalize sees the option. `WithTargetMode` sets both together
and is the replacement.
This package's `"application/octet-stream"` MIME default is preserved
independently of the sdk default. `examples/cmd/benchmark_experimental.go`,
the only non-test consumer in the repo, asked for `SegmentHS256`; updated to
the default `SegmentGMAC` now that `NewWriter` refuses an algorithm it can't
produce instead of silently substituting one.
`manifest.go`'s pre-delegation integrity helpers (`hmacIntegrity`,
`readAEADTag`, `segmentIntegrity`, `rootIntegrity`) are unreachable now that
`Finalize` moved to `sdk.ChunkedWriter`; removed along with the two tests
that only exercised them. Added `TestXORSplitterAdapterRoundTrip`, which
decrypts a 3-KAS ABAC split with real KAS keys to verify the adapter's
`Split` -> `KeyAccess` pipeline end-to-end, since the existing multi-KAS
tests only checked shape.
Because this changes the KAS wire format for EC keys, it wants a cross-SDK
run before merge:
gh workflow run xtest.yml --repo opentdf/tests --ref main \
-f platform-ref=<branch> -f otdfctl-ref=main -f java-ref=main -f js-ref=main
Signed-off-by: Dave Mihalcik <dmihalcik@virtru.com>
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strantalis
dismissed
their stale review
September 24, 2026 18:10
Synced with Dave and we will revisit restructuring in the future
sujankota
approved these changes
Sep 24, 2026
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Proposed Changes
Deletes
experimental/tdfTDF building logic, in favor of existing, more compliantlogic found in root
sdkpackage.The experimental writer built its own key access objects, and for EC KAS
keys it built them wrong in three ways at once. It set keyType
"eccWrapped", butservice/kas/access/rewrap.godispatches on the exactstring
"ec-wrapped"and has no case for the other spelling. It derivedthe wrapping key with HKDF and then XORed the DEK, where the spec and every
KAS expect AES-GCM under that derived key. And it omitted
schemaVersionfrom the KAO entirely. Any TDF this package produced against an EC KAS was
undecryptable, and nothing in the repo caught it because the package tested
its own output against its own expectations.
The fix is not a patch to that code but its deletion.
key_access.go(-266)goes away and
Writerdelegates tosdk.NewChunkedWriter, so key accessobjects come from
sdk.createKeyAccess-- the same code pathSDK.CreateTDFhas always used and that the cross-SDK tests exercise. RSA,EC, ML-KEM and hybrid wrapping now have exactly one implementation.
key_access_test.go(-652) goes with it; equivalent coverage against thesdk functions landed earlier in this stack, so nothing is lost.
writer.godrops from 680 lines to ~292:Writerbecomes its config plusan inner
sdk.ChunkedWriterand afinalizedflag. Manifest assembly,segment encryption, integrity hashing and assertion signing all move to the
one implementation.
manifest.gosheds thecalculateSignaturecopy andthe three constants that only its callers needed.
keysplit_adapter.go(+60) is why this is a delegation rather than arename.
sdk.DefaultKeySplitteris single-KAS and ignores attributes;keysplit.XORSplitterevaluates the full ABAC boolean expression andXOR-splits the DEK across every KAS the resulting clauses require. The two
result shapes are field-identical, so the adapter is a straight copy. The
one structural mismatch is where the default KAS enters -- sdk passes it per
Splitcall, keysplit takes it at construction -- so the splitter is builtinside
Split.API changes callers will notice
Finalizeerror values are aliases of their sdkcounterparts rather than copies, so
errors.Ismatches under either name.WithSegmentsno longer requires a contiguous prefix starting at 0.Indices may be sparse -- a caller mapping fixed index blocks onto S3
multipart uploads writes gaps by construction -- but must still name written
segments in ascending order and may only drop from the end, because that is
the order the payload is laid out in.
WithExcludeVersionFromManifestis deprecated. It was always a no-op: themanifest builder never read the flag. Omitting
schemaVersionis how areader is told the TDF predates 4.3.0, and such a reader then expects
hex-then-base64 signatures, which are decided per segment at write time,
long before Finalize sees the option.
WithTargetModesets both togetherand is the replacement.
WithIntegrityAlgorithmandWithSegmentIntegrityAlgorithmno longer takeeffect, and asking for anything but the default is now an error from
NewWriterrather than a silent substitution. The other variants were unsupportedand resulted in incompatible TDFs/
Checklist
Testing Instructions
This changes the KAS wire format for EC keys, so it wants a cross-SDK run
before merge. Pin it to #3946, not to this branch — that is the first point
where
CreateTDFgoes through the changed code, andotdfctlis the onlyGo consumer xtest drives:
otdfctl-refmust name the branch too: it defaults tomain, which buildsthe CLI against main's
sdk/and makes the run vacuous. Check the job labelreads
go@<branch>rather thango@main.The full DSPX-2604 stack — 20 PRs
mainmainmainmainmainmainmaindspx-2604-base-11= #3932 + #3934 + #3935dspx-2604-base-17= #3944 + #3945dspx-2604-base-19= #3947 + #3939Reviewable in parallel right now, since they sit directly on
mainand depend onnothing else: 01, 02, 04, 05, 06, 07, 08.
Why three PRs have a
dspx-2604-base-*base. A GitHub PR takes one base branch,but 11, 17 and 19 each build on more than one parent. The
base-*branches are emptymerge commits that exist only to join those parents so the PR diff shows exactly its
own change and nothing else. They contain no code, have no PR of their own, and go
away once their parents land — retarget the child onto
mainat that point.Wants a cross-SDK xtest run before merge: 15, 17 (and therefore 20). They touch
the KAS wire format. Dispatch it against 17 or 20, never 15 on its own: xtest drives
the Go side through
otdfctl->SDK.CreateTDF, and 17 is the first commit wherethat call reaches the rewritten writer. Set
otdfctl-refto the same branch asplatform-ref-- it defaults tomain, which builds the CLI against main'ssdk/and makes the run vacuous.
Red checks you may see are network flakes, not this stack. Four distinct ones hit
this batch and all clear on re-run:
golangci-lint config verifytiming out onhttps://golangci-lint.run/.../golangci.v2.8.jsonschema.json(fails the wholego (<module>)job and fail-fast cancels its siblings), the bats installer getting a 403,Docker Hub timing out on
keycloak/keycloak:26.4, andbufreporting "the serverhosted at that remote is unavailable" while the Java SDK generates sources. The
govulncheckstep also emits##[error]annotations against the go1.25.11 stdlib, butit is
continue-on-error: trueand never fails a job — 01 bumps the toolchain andclears those annotations.
Summary by CodeRabbit
WithExcludeVersionFromManifestis deprecated and has no effect.