feat(interop): interop/v2 compressed-values profile RFC (LAB-1135) - #53
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Opt-in successor mode restoring the 2025-11-14 RFC's descoped compressed+encrypted cross-SDK values, as a versioned additive profile. interop/v1 is byte-for-byte untouched; its vectors and tools run unchanged beside the new ones. - spec/interop-v2.md: 0xC1 0x02 + msgpack [method, original_size, payload:bin] container inside AES-256-GCM; constant four-component AAD reusing the frozen "True" token; mode discrimination by configuration (no sniff-and-retry); bounds reuse wire-format constants (512 MB / 1000:1, enforced before decompression); CRIME/BREACH verdict recorded; per-SDK LZ4-block dependency bill; array-of-ints leniency explicitly rejected. - tools/interop-v2-reference.py: stdlib-only generator incl. pure-Python LZ4 block codec; optional lz4/cryptography conformance deepening. - tools/interop-v2-crosscheck.mjs: zero-dep independent container parser, LZ4 decoder, WebCrypto HKDF/AES-GCM verifier. - test-vectors/interop-v2.json: 3 container, 1 AAD, 1 encryption, 13 structural reject, 2 cryptographic cross-mode reject vectors. - CI: v2 verify steps added alongside the existing v1 steps. Design discussion: protocol#52
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WalkthroughThe pull request adds a draft Interop v2 profile for compressed and encrypted values. It defines a versioned MessagePack container, raw LZ4 support, AES-256-GCM separation from v1, strict validation, reference tooling, test vectors, and CI checks. ChangesInterop v2 compressed-values profile
Estimated code review effort: 4 (Complex) | ~60 minutes Merge Risk: ⚪ Minimal · up to This PR adds an opt-in interop/v2 specification and validation tooling without changing existing v1 behavior or SDK runtime code; no actionable merge-blocking risk remains beyond normal checks and review. Sequence Diagram(s)sequenceDiagram
participant VerifyWorkflow as .github/workflows/verify.yml
participant PythonReference as tools/interop-v2-reference.py
participant VectorFile as test-vectors/interop-v2.json
participant JavaScriptCrosscheck as tools/interop-v2-crosscheck.mjs
VerifyWorkflow->>PythonReference: run stdlib and optional-dependency verification
PythonReference->>VectorFile: generate or verify v2 vectors
VerifyWorkflow->>JavaScriptCrosscheck: run independent cross-check
JavaScriptCrosscheck->>VectorFile: validate container, compression, AAD, and encryption vectors
JavaScriptCrosscheck-->>VerifyWorkflow: report success or exit non-zero
🚥 Pre-merge checks | ✅ 3 | ❌ 2❌ Failed checks (2 warnings)
✅ Passed checks (3 passed)
Full details: Linked Issues checkExplanation The PR meets issue Full details: Out of Scope Changes checkExplanation The interop/v2 specification, vectors, tools, documentation links, and CI checks are in scope for issue ✨ Finishing Touches 💡 1📝 Generate docstrings 💡
🧪 Generate unit tests (beta)
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Inline comments:
In `@spec/interop-v2.md`:
- Around line 184-187: Rewrite the method-registry rule in spec/interop-v2.md to
clearly state the required action when adding methods, removing the
contradictory “and” construction and distinguishing spec-registry revision from
container-version-byte requirements. Preserve the rules that readers reject
unknown method values and writers must not emit unregistered methods.
- Around line 221-223: Update the size-limit terminology in the interop-v2
specification tables and corresponding wire-format documentation to use 512 MiB
(536870912 bytes) instead of 512 MB, consistently for both original_size and
payload limits.
In `@tools/interop-v2-crosscheck.mjs`:
- Line 245: Update the hex decoding in the cross-check flow to validate every
JSON-provided hex field with one strict decoder that rejects invalid characters
and odd-length input before calling Buffer.from. Apply it to the reject-vector
path before its expected-rejection try block, including the container_hex value
used by decodeContainer, while preserving the existing rejection handling for
validly decoded malformed containers.
In `@tools/interop-v2-reference.py`:
- Around line 43-46: Update _load_v1 to return ModuleType, importing ModuleType
from types, and replace the assert validating spec and spec.loader with an
explicit guard that raises a clear exception when either is unavailable;
preserve the existing module-loading behavior otherwise.
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Panel verdict FIX-FIRST; all surviving findings applied: - CRIT: marker-level int enforcement — method/original_size MUST use unsigned-family markers; signed family rejected even for non-negative values, making negative original_size structurally unrepresentable (closes the signed-size bounds-bypass class). New vectors: reject_method_signed_marker, reject_negative_original_size. - MAJ: ratio product MUST be computed in >=64-bit integers (overflows 32-bit usize on wasm32, a target the dependency bill mandates). - MAJ: new reject_forged_bin32_length vector pins the validate-length-before-allocating rule (4 GiB forged header). - MAJ: corrected the 0xC1 claim to the leading byte only (0xC1 can appear inside payload/int bodies; only byte 0 is load-bearing). - MAJ: new method0_noncanonical_widths accept-vector pins the readers-accept-any-unsigned-width MUST. - MIN: vector table uses real JSON key names; deleted dead wrap_value; generate now hard-requires cryptography (reseal guard against compressor drift); self-check asserts inner bytes against the PUBLISHED v1 issue_example_object vector cross-file; truncation vs bad-magic diagnostics split in both readers. - Deferred with justification: CI hash-pinning gap is pre-existing and repo-wide, filed as protocol#54. Vectors regenerated: 4 container, 1 AAD, 1 encryption, 16 reject, 2 crypto-reject. Full suite green (stdlib, lz4+cryptography, mjs, v1).
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Expert-panel review (mandatory crypto/protocol gate) — verdict FIX-FIRST, all surviving findings applied in cd182c8:
Security specialist confirmed clean on the load-bearing questions: AAD injectivity + v1/v2 domain separation (incl. the native-SDK Vectors regenerated: 4 container / 1 AAD / 1 encryption / 16 reject / 2 crypto-reject; full suite green locally (stdlib, lz4+cryptography deepening, zero-dep mjs cross-check, all v1 tools unchanged). |
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Inline comments:
In `@spec/interop-v2.md`:
- Line 466: Update the container grammar and reader rules to explicitly permit
array16(3) alongside the canonical fixarray(3), and align the reference tools
and non-canonical-widths vector with this accepted-header rule. Keep the
existing integer and bin header allowances unchanged.
In `@tools/interop-v2-reference.py`:
- Line 262: Update the V2Error handling at the raise sites around the
unsigned-family marker validation and the corresponding line near 288 to remove
Ruff TRY003 violations: move static message text into V2Error or a dedicated
helper while preserving each marker’s dynamic hexadecimal detail.
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CHANGELOG.mdspec/interop-v2.mdtest-vectors/interop-v2.jsontools/interop-v2-crosscheck.mjstools/interop-v2-reference.py
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Spec: reword the method-registry rule (contradictory conjunction); state 512 MiB (536,870,912 B) explicitly everywhere the constant appears (interop-v2, wire-format, saas-api cross-ref, CHANGELOG) — the tools enforce 512*1024*1024 and 'MB' invited a 512e6 misread; permit fixarray/array16/array32 body headers explicitly in the reader rules (the grammar said fixarray(3) while the noncanonical vector requires array16 acceptance). Reference tool: _load_v1 typed + guard-raise; self-check asserts converted to _require/SelfCheckError so 'python -O' can no longer silently skip the verification gate; v1-vector read wrapped with a clear error; prints -> logging (file-backend-reference.py precedent); marker rejections built by a _bad_marker helper (TRY003). Cross-check: strict even-length hex decoding for every JSON-provided hex field (Buffer.from(hex) silently truncates at the first invalid char — a corrupt vector file could pass against its valid prefix); reject-vector hex parsed outside the expected-rejection try; empty catches now assert the rejection type (plain Error for structural, OperationError for AES-GCM auth failure). Vectors regenerated (one description string); all v1+v2 suites green, including verify under python -O.
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…tion diff (LAB-1135) Panel (4 agents, high stakes) on ebc0b4f: bug-hunter and security both clean — verification chain confirmed strictly fail-closed, no normative drift, MiB wording matches the frozen 536870912 constant everywhere. Surviving craftsman/catchphrase findings applied: - logging.basicConfig(stream=sys.stdout): the print->logging conversion had silently moved OK/wrote lines to stderr, diverging from the twin JS cross-check. - skipped-conformance notes upgraded to logging.warning so they surface even when the module is imported without a configured handler. - _bad_marker takes the full clause, restoring the original message phrasing ('payload must be msgpack bin', 'container body must be a msgpack array') that the vector error notes echo. - reject/crypto-reject self-check loops use try/except/else instead of flag variables; single-use _ERR_TRUNCATED_HEADER constant inlined; redundant instanceof clause dropped in the JS structural-reject catch. All suites re-verified green (py, py -O, py+lz4+cryptography, mjs, v1).
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Actionable comments posted: 1
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Inline comments:
In `@tools/interop-v2-reference.py`:
- Around line 745-746: Resolve the Ruff PERF203 diagnostic in the
rejection-vector loop by extracting the V2Error-handling check into a helper, or
add a narrowly scoped PERF203 suppression with an explanation that each vector
must run independently; preserve the existing behavior of ignoring V2Error for
individual vectors.
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…ERF203) (LAB-1135) Extract the structural-reject try/except into _expect_structural_reject, resolving Ruff PERF203 on the self-check loop. Behaviour identical: only V2Error counts as an expected rejection; corrupt hex and any other exception still propagate, and a vector that fails to raise still fails the self-check.
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Closes #52 · Workspace ticket LAB-1135
What
The interop/v2 compressed-values profile RFC: spec text, generated test vectors, and independent cross-check tooling for opt-in LZ4-compressed (and optionally AES-256-GCM-encrypted) cross-SDK cache values — restoring the 2025-11-14 RFC's descoped vision as a versioned additive profile. interop/v1 is byte-for-byte untouched; its vectors and tools run unchanged beside the new ones in this PR's CI.
Design core
nonce‖ct‖tagblob whose first byte is unconstrained, so any magic misclassifies 1-in-256 legitimate v1 entries.0xC1 0x02+ msgpack[method, original_size, payload:bin].0xC1is MessagePack's reserved never-used byte, so a container can never silently decode as a v1 value. AAD stays a constant four components with the frozen"True"token (protocol#12) — deterministic pre-AAD, no sniff-and-retry, and cross-mode reads fail AES-GCM authentication (pinned both directions by vectors).binnormative from birth (protocol 1.1); the legacy array-of-ints leniency is explicitly rejected (pinned by vector).method 0escape hatch, application guidance; padding considered and rejected).lz4(store_size=False), rslz4_flex(already in tree), ts via existing cachekit-core NAPI/wasm bindings (zero new npm deps); PHP remains the priced cautionary case.Verification (all run locally, green)
python3 tools/interop-v2-reference.py verify— stdlib-only, incl. a pure-Python LZ4 block codeclz4+cryptographyinstalled: bidirectional conformance with the C LZ4 implementation, AES-GCM seal, both cross-mode AAD rejectionsnode tools/interop-v2-crosscheck.mjs— zero-dep independent container parser + LZ4 decoder + WebCrypto HKDF/AES-GCMStatus
Spec status is DRAFT (PROPOSED) — it leaves DRAFT when the vectors run in cachekit-py/ts/rs CI (follow-up SDK work, gated on ratification). No SDK code changes in this PR.
Summary by CodeRabbit
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