docs(core): admit S5-B3 chunked large-object envelope - #582
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Reviewer's GuideThis documentation-only PR admits the S5-B3 per-chunk-authenticated envelope for protected records over 64 MiB, integrates its format and status into the parent R-15 contract, and updates the migration ledger; no production implementation, authority switch, or existing whole-record behavior is changed. Sequence diagram for reading a chunked large-object envelopesequenceDiagram
participant Caller
participant Storage
participant Marker
participant Chunks
participant Digest
Caller->>Storage: read record
Storage->>Marker: authenticate marker
Marker-->>Storage: is_chunked and chunk_count
Storage->>Chunks: read chunk envelopes 0..chunk_count-1
Chunks-->>Storage: authenticate each chunk with AEAD and AAD
Storage->>Digest: recompute chunk_set_digest
Digest-->>Storage: verify marker content_digest
alt all chunks authenticate and digest matches
Storage-->>Caller: concatenate plaintext in chunk_index order
else missing, tampered, or mismatched chunk set
Storage-->>Caller: typed parse/authentication failure
end
Flow diagram for chunked large-object envelope selectionflowchart LR
Record[Protected record] --> Limit{ciphertext_len exceeds 64 MiB?}
Limit -->|No| Whole[Ordinary whole-record WSR1 envelope]
Limit -->|Yes| Split[Split into 16 MiB plaintext chunks]
Split --> Encrypt[Create one AEAD envelope per chunk]
Encrypt --> Bind[Bind record identity, chunk_index, and chunk_count in AAD]
Bind --> Digest[Compute chunk_set_digest]
Digest --> Commit[Commit marker with is_chunked and chunk_count]
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This PR successfully admits the S5-B3 Chunked Large-Object Envelope child contract, closing the last explicit blocker in the S5-A baseline. All three updated documents maintain internal consistency, follow established patterns from S5-B1/S5-B2, and properly integrate the chunked envelope mechanism into the existing R-15 contract framework.
The documentation correctly:
- Updates status flags across all affected documents to reflect S5-B3 admission
- Adds proper bidirectional cross-references between parent and child contracts
- Defines a chunked envelope format that reuses already-admitted primitives (AES-256-GCM, digest-set pattern)
- Maintains the fail-closed security posture throughout
- Clarifies that production implementation has not started
No blocking defects identified. The changes are documentation-only and do not modify any executable code.
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Code Review Summary
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Hey - I've found 3 issues
Prompt for AI Agents
Please address the comments from this code review:
## Individual Comments
### Comment 1
<location path="docs/native/r15/CHUNKED-LARGE-OBJECT-ENVELOPE.md" line_range="52-58" />
<code_context>
+
+## 4. Marker body extension
+
+The single-record `ACTIVE`/`PENDING` marker bodies (§5.4) gain one new field, present for every record regardless of chunking status, to keep exactly one normative body shape rather than two divergent ones:
+
+```text
+is_chunked u8; 0 = whole-record envelope, content_digest below is that envelope's
+ §5.4 content_digest; 1 = chunked envelope, content_digest below is this
+ record's chunk_set_digest (§3, above) and chunk_count (u32be) follows
+chunk_count u32be, present only when is_chunked = 1
+```
+
</code_context>
<issue_to_address>
**issue (bug_risk):** The child contract changes the normative ACTIVE/PENDING marker body, but the parent contract's §5.4 marker layouts remain unchanged and still define the exact body fields without `is_chunked` or `chunk_count`. An implementation following the parent schema therefore produces markers that the chunked read path cannot parse, while an implementation following this child schema produces markers that existing parent-schema readers reject.
**Triggers:** When the parent and child documents are implemented or reviewed independently.
**Suggested fix:** Update the parent §5.4 marker schemas and all marker digest/size/AAD rules to include the new fields and define their exact placement and presence semantics.
</issue_to_address>
### Comment 2
<location path="docs/native/r15/CHUNKED-LARGE-OBJECT-ENVELOPE.md" line_range="21-22" />
<code_context>
+
+**Chunk sizing.** Fixed chunk size of `16 MiB` plaintext per chunk (a versioned constant — `CHUNK_PLAINTEXT_SIZE_V1`), except the final chunk, which holds the remainder and MAY be smaller. A record's chunk count is `ceil(plaintext_byte_length / CHUNK_PLAINTEXT_SIZE_V1)`, always at least `1` (a record only reaches this format because it exceeds the whole-record limit, so `chunk_count >= 1` always holds in practice, but the formula itself does not special-case zero-length input beyond what §6.1.2 already requires for any record).
+
+**Per-chunk envelope.** Each chunk is its own complete AEAD-protected envelope, structurally identical to the whole-record `WSR1` envelope (§6.1.2's header, ciphertext, tag) with one addition to AAD:
+
+```text
+chunk AAD = the containing record's own final-record AAD (§6.2: domain, record_class,
</code_context>
<issue_to_address>
**issue (bug_risk):** The admitted chunk format is not separately versioned as required by the parent §6.3: every chunk is declared to be structurally identical to the ordinary `WSR1` envelope, with only an AAD change. There is no chunk-envelope version or format discriminator in the chunk bytes, so the format cannot negotiate or reject chunk-format revisions independently of the record marker and cannot be dispatched from an envelope alone.
**Triggers:** When a chunk is inspected, recovered, or handled by a component that does not already have the record marker's `is_chunked` context.
**Suggested fix:** Define a distinct chunk-envelope version/type in the chunk header or otherwise make the versioned chunk format an authenticated, normative part of the envelope routing metadata.
</issue_to_address>
### Comment 3
<location path="docs/native/r15/CHUNKED-LARGE-OBJECT-ENVELOPE.md" line_range="80-83" />
<code_context>
+ chunk_index order to reconstruct the record's plaintext
+```
+
+## 6. Write path
+
+Chunked writes follow §9's existing ordinary-write contract with one extension between steps 3 and 4 (staging): the record is split into chunks per §2's sizing rule, each chunk is independently serialized/authenticated/staged as its own envelope (§9 step 3-5, applied per chunk), and `chunk_set_digest` is computed over the complete staged chunk set before promotion. Promotion (§9 step 7) promotes every chunk's staging file together as one atomic set — a partial promotion (some chunks promoted, others not) is never reported as durable success; §9's existing crash-recovery table applies per chunk exactly as it already applies to a single whole-record staging file, with the record-level durable-success boundary requiring *every* chunk's promotion plus the marker's `chunk_set_digest` commit to be durable together, never independently.
+
</code_context>
<issue_to_address>
**issue (bug_risk):** The write path requires all chunk staging files to be promoted as one atomic set, but ordinary filesystem file replacement cannot atomically rename multiple files. A crash between two per-file promotions leaves a partial chunk set; the cited per-file §9 recovery rules do not define a record-level manifest, transaction, or cleanup protocol that distinguishes and repairs that partial set before success is reported.
**Triggers:** When a crash or process termination occurs during promotion of a multi-chunk record.
**Suggested fix:** Specify a single atomically replaced generation container/manifest, or add an explicit durable set-commit and recovery protocol that tracks every chunk and removes or resumes partial promotions before publishing the marker.
</issue_to_address>Sourcery assessment
Needs a human reviewer. 3 findings to address first, and this changes the admitted cryptographic storage contract by defining chunk authentication, manifest integrity, and marker semantics that a future implementation will rely on. No production code, authority switch, or user data is changed yet, so reverting the documents removes the decision; the main residual risk is bounded rework or migration-vector repair if the contract proves inconsistent or insecure.
Blocking findings: docs/native/r15/CHUNKED-LARGE-OBJECT-ENVELOPE.md:58, docs/native/r15/CHUNKED-LARGE-OBJECT-ENVELOPE.md:22, docs/native/r15/CHUNKED-LARGE-OBJECT-ENVELOPE.md:83
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📝 WalkthroughWalkthroughThe PR adds the S5-B3 chunked large-object envelope specification and records its admission in the R-15 contract and migration ledger. Implementation remains unstarted, and terminal closure still requires a cross-contract consistency audit. ChangesS5-B3 Storage Contract
Estimated code review effort: 1 (Trivial) | ~5 minutes Merge Risk: 🟡 Moderate · up to The PR admits a chunked large-object format, but key security, compatibility, digest, and atomic-publication rules remain undefined or contradictory; an implementation could misbind chunks, reject valid records, or expose incomplete data. Merge should wait until these contract details are made normative. 🚥 Pre-merge checks | ✅ 5✅ Passed checks (5 passed)
Full details: Docstring CoverageExplanation No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 0 files. (3 skipped: 3 unsupported.) ✨ Finishing Touches🧪 Generate unit tests (beta)
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Actionable comments posted: 5
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Inline comments:
In `@docs/native/R15-SECURE-STORAGE-CONTRACT.md`:
- Around line 1467-1469: Update the large-record guidance in the secure-storage
contract to state that domain separation is provided by per-chunk AAD, while
each chunk nonce is independently generated using a CSPRNG; do not imply nonce
derivation from chunk_index, and preserve the existing bounded chunked-record
requirement.
In `@docs/native/r15/CHUNKED-LARGE-OBJECT-ENVELOPE.md`:
- Around line 24-28: Define a canonical record-level header for chunked records
and specify its exact byte encoding for use in the final-record AAD, replacing
the ambiguous per-chunk header reference. Update the chunk AAD formula and the
chunk identity definition so the canonical chunk locator is either explicitly
included and authenticated or explicitly designated only as a storage locator,
ensuring writers and readers use the same normative inputs.
- Around line 52-59: Version the §5.4 marker-body extension or define an
append-only compatibility rule so legacy readers retain the original layout,
including for whole-record records. Update marker parsing and serialization to
distinguish the legacy and extended forms without shifting the existing
content_digest offset, and add a complete compatibility vector covering a
non-chunked marker body.
- Around line 45-46: Define the per-chunk content_digest contract in the chunk
envelope documentation: specify its canonical input bytes, digest algorithm,
encoded representation and length, and whether it is stored in the envelope or
deterministically derived. Align the definition with the §5.4 content_digest
requirements and ensure verification can be performed without relying on an
undefined parent WSR1 field.
- Line 82: Revise the chunked-write protocol around the staging and promotion
steps to define one durable commit point for the complete chunk set, using an
atomic manifest or directory publication primitive rather than claiming
independent file promotions are atomic. Specify the required fsync ordering,
marker and set publication sequence, rollback behavior on partial failure, and
recovery reconciliation for orphaned or incomplete chunks, while preserving the
record-level requirement that success is reported only after the complete set
and chunk_set_digest are durable.
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Closes the fail-closed blocker PR #564's S5-A baseline left for records above the 64 MiB whole-record ciphertext_len limit, per issue #579. Verified real source first: importBinderFileThunk accepts binder attachments of any size with no client-side cap, so this is a reachable gap for a writing-research tool, not a theoretical one. Admits the format S6.3 already anticipated: fixed 16 MiB plaintext chunks (final chunk may be shorter), each its own complete WSR1 envelope reusing the existing version marker (chunk-vs-whole-record dispatch always comes from the marker's is_chunked flag, never from inspecting envelope bytes alone), with mandatory independent CSPRNG nonces and identity-plus-chunk-index-bound AAD. Chunk-set integrity reuses the exact catalog_set_digest/journal_page_set_digest pattern already proven twice in this contract family. Updates the parent contract's actual S5.4 ACTIVE/PENDING marker body field lists directly (not just prose) to append is_chunked/chunk_count as trailing fields after every existing field, so no prior field's byte offset shifts - closing a real inconsistency where the child document's marker assumptions diverged from the parent's own un-updated canonical definition. Corrects the write path to make no false atomic-multi-file-promotion claim: exactly one thing is atomic (the existing marker commit, S9 step 9); chunks are merely durably staged before it, with recovery re-deriving partial-set state per chunk rather than assuming any cross-file transaction, and an orphaned staged chunk from a discarded attempt reconciled via S5-B1's existing atomic-write-temporary mechanism. Makes the chunk AAD/header composition and per-chunk content_digest formula explicit rather than implicit, and corrects the parent's S6.3 nonce wording to remove the implication that domain separation could come from nonce derivation. Updates the parent's S6.1.2/S6.3/S13 blocker language, header status flags, and section 21 to record S5_B3_ADMITTED = YES, and the migration ledger's row 10 accordingly. All three S5 child contracts are now admitted; S5_TERMINAL still requires the final cross-contract consistency audit before it may be declared.
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Summary
importBinderFileThunkaccepts binder attachments of any size, no UI-level size validation exists — this is a reachable gap, not theoretical.docs/native/r15/CHUNKED-LARGE-OBJECT-ENVELOPE.mdadmits the format §6.3 already anticipated: fixed 16 MiB plaintext chunks, each its own AEAD envelope with mandatory independent CSPRNG nonces and record-identity-plus-chunk-index-bound AAD, integrity viachunk_set_digest— reusing the exactcatalog_set_digest/journal_page_set_digestpattern already proven twice in this contract family, not a new mechanism.S5_B3_ADMITTED = YES; updatesCORE-MIGRATION-LEDGER.mdrow 10 accordingly.S5_TERMINALstill requires a final cross-contract consistency audit before it may be declared — not claimed by this PR.Design only — no implementation, no production authority switch, no change to the whole-record envelope or any S5-A/S5-B1/S5-B2 mechanism.
Test plan
pnpm run docs:check/pnpm run ci:prepushgreenSummary by Sourcery
Admit the S5-B3 secure chunked-envelope contract for oversized protected records while keeping implementation and the final S5 consistency audit pending.
New Features:
Enhancements:
Documentation:
Tests:
CodeAnt-AI Description
Admit a secure chunked format for protected records larger than 64 MiB
What Changed
Impact
✅ Oversized attachments have an admitted secure storage format✅ No partial payloads after missing or corrupted chunks✅ Existing whole-record storage remains unchanged💡 Usage Guide
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