chore(sdk): extract integrityAlgorithmString, createPolicyBinding, signAssertions - #3934
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📝 WalkthroughWalkthroughThe SDK adds shared helpers for assertion signing, integrity algorithm naming, and policy binding creation. TDF generation now uses these helpers. Tests cover algorithm mapping and policy binding variation. ChangesTDF helper consolidation
Estimated code review effort: 3 (Moderate) | ~20 minutes Merge Risk: 🔵 Low · up to The helper consolidation preserves the existing TDF construction flow, but policy-binding tests do not yet verify the exact interoperable binding value. This is a low merge-readiness risk and should be strengthened to prevent future format regressions. Suggested reviewers: Poem
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…gnAssertions
CreateTDFContext inlines three self-contained pieces of manifest
construction. Lifting them into named helpers shortens the function and
gives the chunked writer work later in the DSPX-2604 stack something to
call instead of copying.
Pure relocation -- no new callers and no behavior change on any input
CreateTDF can produce -- with one thing a reviewer should see rather
than find:
integrityAlgorithmString inverts the default. The old code read
"str = GMAC; if a == HS256 { str = HMAC }", so an unrecognized value
mapped to GMAC. The new switch is "case GMAC: GMAC; default: HMAC", so
an unrecognized value maps to HMAC. IntegrityAlgorithm is `= int`
(tdf_config.go) with HS256=0 and GMAC=1, so both legal values behave
exactly as before and only an out-of-range int changes. The new default
is the safer of the two, since HS256 is what the format itself defaults
to, but it is a change, and the new test asserts it.
createPolicyBinding also swaps the literal "HS256" for the existing
hmacIntegrityAlgorithm constant, which is defined as "HS256".
Signed-off-by: David Mihalcik <dmihalcik@virtru.com>
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Inline comments:
In `@sdk/tdf_helpers_test.go`:
- Around line 30-35: Update the test around createPolicyBinding to compute the
expected HMAC over the base64-encoded policy value, then assert binding.Hash
exactly matches that expected value while retaining the algorithm assertion and
valid-encoding check. Ensure the expectation distinguishes hashing the encoded
policy bytes from hashing the raw JSON.
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sdk/assertion.gosdk/tdf.gosdk/tdf_helpers_test.go
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Proposed Changes
CreateTDFContext inlines three self-contained pieces of manifest
construction. Lifting them into named helpers shortens the function and
gives the chunked writer work later in the DSPX-2604 stack something to
call instead of copying.
Checklist
Testing Instructions
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.
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
New Features
Bug Fixes
Tests