fix(sdk): DSPX-4590 default per-segment sizes when a writer omits them - #3979
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📝 WalkthroughWalkthroughThe SDK now resolves omitted segment sizes from manifest defaults. Payload sizing, streaming, and ChangesTDF segment sizing
Priority: ⬇️ Low — Defer the SDK segment-size compatibility change because it is limited to manifest parsing, streaming, and variable-segment reads. Estimated code review effort: 4 (Complex) | ~45 minutes Merge Risk: 🟠 High · up to Omitted segment sizes are handled across read paths, but malformed size declarations can still crash streaming reads or produce incorrect plaintext. The shared size validation should be fixed before merge. Sequence Diagram(s)sequenceDiagram
participant Reader
participant IntegrityInformation
participant SegmentDecryptor
Reader->>IntegrityInformation: resolveSegmentSizes(segment)
IntegrityInformation-->>Reader: plaintext and ciphertext sizes
Reader->>SegmentDecryptor: decrypt intersecting ciphertext
SegmentDecryptor-->>Reader: plaintext segment data
Reader-->>Reader: copy requested plaintext range
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In `@sdk/tdf.go`:
- Around line 994-1001: Update resolveSegmentSizes to validate that each
segment’s declared Size equals EncryptedSize minus the GCM IV and AES block
overhead before returning resolved sizes. Remove the duplicate invariant check
from ReadAt, while preserving existing error propagation and allowing WriteTo
and LoadTDF to rely on the shared resolver.
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sdk/manifest.gosdk/tdf.gosdk/tdf_readat_test.gosdk/tdf_segment_defaults_test.gosdk/tdferrors.go
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segmentSize and encryptedSegmentSize are optional per-segment overrides: manifest.schema.json requires only the integrityInformation defaults, and web-sdk omits the per-segment keys whenever they equal the default, so every web-sdk container over one segment failed to decrypt in go-sdk. Fall back to the manifest defaults in the payload-size computation, WriteTo and ReadAt. Rebased onto #3933 (map ReadAt plaintext offsets from cumulative segment sizes), which rewrote ReadAt's segment lookup from a uniform DefaultSegmentSize stride to a walk over each segment's actual plaintext/ciphertext size -- necessary for the non-uniform segments sdk/experimental/tdf can emit. Reconciling the two surfaced a further bug: resolveSegmentSizes treated a per-segment size of 0 as "omitted, use the default" independently for Size and EncryptedSize, but JSON can't distinguish an omitted key from an explicit 0, and go-sdk's own CreateTDF already writes segmentSize: 0 for the sole segment of an empty-payload TDF (no omitempty on the field). That made an empty TDF round-trip to the wrong payloadSize. resolveSegmentSizes now resolves EncryptedSize first -- its zero value is never ambiguous, since ciphertext can never legitimately be zero bytes -- and disambiguates a zero Size by comparing the resolved EncryptedSize against DefaultEncryptedSegSize rather than assuming Size and EncryptedSize are only ever omitted together. Checking go-sdk, java-sdk and web-sdk's actual manifest-writing source confirmed go-sdk and java-sdk always set both fields together (so a joint-zero assumption happened to hold for them), but web-sdk's lib/tdf3/src/tdf.ts decides whether to omit segmentSize and encryptedSegmentSize with two independent equals-the-default comparisons, not one joint check -- so a joint-zero- only version would have mis-resolved a segment where only one of the two happened to be omitted. The corrected comparison needs no assumption about the cipher's per-segment overhead (nonce/tag size stays out of manifest.go entirely): the overhead is constant across every segment in one manifest, so if the resolved EncryptedSize equals its default, the plaintext size must too, regardless of what that overhead number actually is. Also gives calculateSignature's too-short-ciphertext-for-GMAC error (previously a bare, unclassified error) a proper ErrTampered-wrapped sentinel, consistent with the rest of this file's integrity failures. Verified against opentdf/tests' DSPX-4592-java-underflow branch (adds test_tdfs.py::test_chunky_roundtrip, a 5 MiB round-trip that forces a full-default-sized segment): with platform-ref and otdfctl-ref both pointed at this branch and XT_FORCE_SUPPORTS=chunky, js-encrypt -> go-decrypt passes (js omits per-segment sizes on the full-sized segment; go now defaults them back). The one remaining failure in that run, js-encrypt -> java-decrypt, is java-sdk's own pre-existing GMAC-on-empty- segment bug (DSPX-4589), unrelated to this change. Note on #3933 standalone: without this fix, #3933's cumulative-walk ReadAt uses seg.Size directly, so an omitted (0) per-segment size stalls the plaintext cursor and desyncs the ciphertext offset for every segment after it. Reading a web-sdk multi-segment file then fails with a misleading "tamper detected: failed integrity check on segment hash" instead of main's current (also broken, but at least consistent) "fail to create gmac signature". #3933 should not be merged or relied on standalone for real multi-segment interop until this lands on top of it. The zip64/ZIP64-conformance findings originally bundled with this change (findings 1-6 of the DSPX-4590 investigation) now live in a separate PR stacked on top of this one, since they are independent of the segment- size defaulting fixed here. Signed-off-by: Dave Mihalcik <dmihalcik@virtru.com>
Signed-off-by: Dave Mihalcik <dmihalcik@virtru.com>
WriteTo trusted resolveSegmentSizes' declared Size without checking it against EncryptedSize, unlike ReadAt's existing guard. A manifest with a Size that disagrees with EncryptedSize could let decryptedDataOffset run ahead of the actual decrypted length, panicking on writeBuf[offset:] once a later segment landed mid-request. Add the same invariant check ReadAt already performs, and move it into resolveSegmentSizes itself so all three call sites (the payload-size sum in LoadTDF, WriteTo, and ReadAt) enforce it identically instead of duplicating the same four-line check twice. This closes a gap where LoadTDF's payload-size computation did not validate the invariant at all -- a manifest inconsistent enough for ReadAt/WriteTo to reject could still "successfully" load with a wrong payloadSize, only failing later at read time. Manifest-level defaults are now checked the same way as explicit per-segment fields, so tampering with the defaults themselves (reachable once per-segment fields are omitted) is caught too. Also: - Fixes resolveSegmentSizes' doc comment, which cited a bogus example default (128 bytes, matching neither go-sdk's nor web-sdk's actual segment-size defaults) and had a grammar error. - Fixes the Segment doc comment, which claimed "EncryptedSize is never 0" while the code three lines below explicitly checks for that case; reworded to clarify it means the wire-level value is never legitimately zero, not that the Go field itself never reads as 0. - Reworks ErrSegSizeUnresolved's message, which said "missing from manifest" but also fires for a present, negative size. - Adds WriteTo coverage to TestReaderReadAtDeclaredSizeMismatch: the invariant check added here had no test exercising it via WriteTo. - Adds Test_TamperedManifestDefaultsRejected, an end-to-end test tampering the manifest-level defaults (rather than any per-segment field) on a TDF with omitted per-segment sizes. - Adds TestCalculateSignatureGMACShortCiphertext, covering the ErrGMACSignatureFailed path introduced two commits back, which had no test. - Adds two more resolveSegmentSizes table cases covering inconsistent explicit sizes and inconsistent manifest-level defaults. Signed-off-by: Dave Mihalcik <dmihalcik@virtru.com>
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Closes [DSPX-4592](https://virtru.atlassian.net/browse/DSPX-4592). ## Why ZIP central-directory offsets and sizes are 32-bit **unsigned** on the wire. A reader that widens one with a signed read sees anything `>= 2**31` as negative; at or above `2**32` the format mandates the ZIP64 sentinel, so the 32-bit field never holds a real value. That leaves exactly one broken window, `[2**31, 2**32)`, and nothing in this suite reached it — `--large` is 5 GiB, which steps straight over. ## What lands - `xtest/sizes.py` — adds `medium` (2 254 857 830 B, ~102 MiB inside the low edge of the window — shrinking it doesn't make the test cheaper, it makes it vacuous) and the window predicates (`in_zip64_window`, `exercises_zip64_window`). - `xtest/zipinspect.py` — a raw ZIP central-directory reader that keeps the 32-bit fields alongside the resolved values. `zipfile` normalises ZIP64 away, which is exactly the encoding under test. Lets a failure name the SDK at fault instead of reporting "decrypt failed" after an hour and 6 GiB of IO. - `xtest/test_zip64.py` — the roundtrip cell, marked `zip64` and **deselected** (not skipped) unless the session's sizes reach `2**31`. Asserts an offset actually landed in the window, so a mis-sized payload fails rather than passes vacuously. Writer conformance is checked *before* the reader xfail is applied, so a writer regression can't hide behind a known reader bug. Reuses `tdfs.skip_chunky_skew` (from [#590](#590)) to keep the independent segment-defaulting defect out of the ZIP64 result. - `tdfs.zip64_reader_xfail` — `xfail(strict=True)` keyed on semver for java decryptors predating java-sdk#393. Strict, so the cell must flip to a hard failure when the fix ships and somebody deletes the predicate. - A nightly-only `zip64` job in `xtest.yml`: own 90 m timeout, matrixed over the encrypting SDK, no `--skip-released-pairs` (a released java decryptor is the point). Parses its own junit XML and fails if no cell executed. Also pins the `bench` job's platform ref through the same resolved main SHA the zip64 job uses, so both share one commit instead of resolving "main" independently. - `xtest/test_zip64_units.py` (20 tests) on the offline PR gate, since the nightly's verdict is only as good as this parser. - `spec/DSPX-4592.md` — spec and live-run findings. ## Sibling PRs | Repo | PR | Covers | |---|---|---| | java-sdk | opentdf/java-sdk#396 | DSPX-4589 — `readUnsignedInt`, `needsZip64`, segment-size defaulting | | platform (go) | opentdf/platform#3979 | DSPX-4590 — `resolveSegmentSizes`, `LoadTDF` payload size | | web-sdk | opentdf/web-sdk#1017 | DSPX-4591 — ZIP64 writer conformance | Stacked on [#590](#590) (chunky segment-defaulting), which stacks on [#589](#589) (configurable payload sizes), which stacks on [#588](#588) (XT_FORCE_SUPPORTS). This PR is scoped to ZIP64 conformance only — chunky segment-defaulting coverage split out to #590 since it's an orthogonal, independently-mergeable concern found along the way. ## Follow-ups (not in this PR) - Once the go and java fixes release, replace the `exit 1` in the `chunky)` case of `xtest/sdk/{go,java}/cli.sh` with real version gates. - Consider widening `zip64_reader_xfail` once the first nightly reports which cells actually fail. ## Verification `ruff check` / `ruff format` / `pyright` clean from `xtest/`. Full offline harness suite (177 tests) passes. `actionlint` on `xtest.yml`/`check.yml` reports the same 15 pre-existing shellcheck info findings as `main`, no new ones. Draft: the `zip64` job has not had a live `workflow_dispatch` run yet. Doing that against this branch is the last gate before marking ready. [DSPX-4592]: https://virtru.atlassian.net/browse/DSPX-4592?atlOrigin=eyJpIjoiNWRkNTljNzYxNjVmNDY3MDlhMDU5Y2ZhYzA5YTRkZjUiLCJwIjoiZ2l0aHViLWNvbS1KU1cifQ <!-- This is an auto-generated comment: release notes by coderabbit.ai --> ## Summary by CodeRabbit - **New Features** - Added configurable payload-size testing for small, medium, chunky, and large scenarios. - Added optional controls for forcing feature support and running ZIP64 validation workflows. - Added cross-SDK ZIP64 boundary coverage for large files and multi-segment containers. - **Bug Fixes** - Improved detection and reporting of malformed ZIP64 structures and unexpected test-support errors. - **Documentation** - Documented test-size options, environment settings, and ZIP64 validation coverage. - Documented the deprecated `--large` option alias. <!-- end of auto-generated comment: release notes by coderabbit.ai -->
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Jira: https://virtru.atlassian.net/browse/DSPX-4590
Part 2 of a 3-PR stack: #3933 (base) <- this PR <- #3981 (zip64 conformance, stacked on top).
Based on #3933 (fix(sdk): map ReadAt plaintext offsets from cumulative
segment sizes) rather than
main, since both PRs rewroteReader.ReadAtfor independent reasons and needed to be reconciled rather than merged
separately.
Relationship to #3933
#3933 replaced
ReadAt's uniform-stride segment lookup(
offset / DefaultSegmentSize) with a cumulative walk over each segment'sactual declared size, so non-uniform segments (which
sdk/experimental/tdfcan emit) map to the correct plaintext offsets.
This PR fixes finding 7 of the DSPX-4590 investigation on top of that:
manifest.schema.jsonmakes per-segmentsegmentSize/encryptedSegmentSizeoptional (a writer may omit them whenever they equal the manifest-level
default), and web-sdk does exactly that. go-sdk's reader didn't default
them back, so every web-sdk container over one segment failed to decrypt.
IntegrityInformation.resolveSegmentSizesnow substitutes the manifestdefaults, wired into
LoadTDF'spayloadSizecomputation,WriteTo, andReadAt(using #3933's cumulative-walk structure, callingresolveSegmentSizesper segment instead of trustingseg.Size/seg.EncryptedSizedirectly).The empty/omitted per-segment size ambiguity
JSON can't distinguish an omitted key from an explicit
0. go-sdk's ownCreateTDFwritessegmentSize: 0(noomitempty) for the sole segment ofan empty-payload TDF, so an early version of this fix that treated any
0as "omitted" mis-resolved that case. Checking go-sdk, java-sdk and web-sdk's
actual manifest-writing source found:
Size/EncryptedSizetogether (neverindependently zero).
lib/tdf3/src/tdf.ts) decides whether to omit each field withtwo independent equals-the-default comparisons, not one joint check.
resolveSegmentSizesnow resolvesEncryptedSizefirst -- its zero valueis never ambiguous, since ciphertext can never legitimately be zero bytes --
and disambiguates a zero
Sizeby comparing the resolvedEncryptedSizeagainst
DefaultEncryptedSegSize, rather than assuming the two fields areonly ever omitted together. This needs no assumption about the cipher's
per-segment overhead (nonce/tag size stays out of
manifest.goentirely):the overhead is constant across every segment in one manifest, so if the
resolved
EncryptedSizeequals its default, the plaintext size must too,regardless of what that overhead number actually is.
GMAC failure classification
calculateSignature's too-short-ciphertext-for-GMAC path returned a bare,unclassified
errors.New(...), unlike every other integrity failure in thisfile. It now returns a new
ErrGMACSignatureFailed, wrapped inErrTamperedlike
ErrSegSizeMismatch/ErrSegSigValidation.A note on #3933 standalone
Without this fix, #3933's cumulative-walk
ReadAtusesseg.Sizedirectly,so an omitted (
0) per-segment size stalls the plaintext cursor and desyncsthe ciphertext offset for every segment after it. Reading a web-sdk
multi-segment file then fails with a misleading
tamper detected: failed integrity check on segment hashinstead ofmain's current (also broken,but at least consistent)
fail to create gmac signature. #3933 should notbe merged or relied on standalone for real multi-segment interop until
this lands on top of it.
Testing
cd sdk && go test ./... -racemake fmt,make lint(0 new issues)cd sdk && go test -run TestREADMECodeBlocksopentdf/tests'DSPX-4592-java-underflowbranch(
test_tdfs.py::test_chunky_roundtrip, a 5 MiB round-trip that forces afull-default-sized segment): with
platform-ref/otdfctl-refpointed atthis branch and
XT_FORCE_SUPPORTS=chunky, js-encrypt -> go-decryptpasses. The one remaining failure in that run, js-encrypt -> java-decrypt,
is java-sdk's own pre-existing GMAC-on-empty-segment bug (DSPX-4589),
unrelated to this change.
Supersedes #3967, which is left open, unmodified, for reference.
Summary by CodeRabbit
New Features
Bug Fixes