Open reads format 3 (spec 29.2 to 29.7, 63 steps 17 and 18): the
PRELUDE accepts VERSION 3, and the files go to a Sink.
- Sink: Begin with the validated head, Create for each file in the
order of the head, and Commit only after every check of step 17;
after any failure that follows a successful Begin, Abort, once. A
format 3 capsule without a Sink fails right after step 2 with
ErrSinkRequired, a caller error with no code, no failed step and no
request; a capsule of format 1 or 2 without dst fails there too.
- Step 17 in its substeps: the frame and the area, security and its
verdicts, which never fail, the head, the files filling CONTENT, the
SHA-256 of each file and the padding. A failure of age or a
plaintext whose length is not P prevails; otherwise the first
substep that fails decides, and a code other than ERR_INTEGRITY is
reported only after reading PAYLOAD_AGE to its end.
- The reads of BODY grow with the bytes received, never with AREA_LEN,
HEAD_LEN or a declared size (spec 57); a test measures it.
- A failure of the Sink is the caller's own error with ERR_INTEGRITY,
as one of dst is in formats 1 and 2.
- Opened gains Head, Verdicts, AreaLen and UnusableHeadExtensions.
- Test data: "version changed" sets VERSION 4, and the format 2 list
gains "format 2 time_only relabeled format 3", which fails at step
14, as section 64 of spec v0.10 lists: 126 cases, 89 of the spec.
The randomly built capsules keep their recorded bytes.
- testkit: Build writes format 3 and can edit the padded plaintext;
Head3, Body3, DiscardSink and MemorySink build and open BODY.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- Format3 and the control of schema version 3, with the keys of
version 2 (spec 31). The PRELUDE still rejects VERSION 3 until the
reader opens format 3, in step 3, with the test data that expect it.
- The frame of BODY (spec 29.2): AREA_LEN, SECURITY_LEN and HEAD_LEN,
their limits against L and the zeros of the area, all ERR_INTEGRITY.
- security (spec 29.3, 29.7): the outer map, with the signature and
the seal as separately encoded byte strings, and its verdicts X, F0,
F1, S0, S1 and S2, which never fail. The first row that holds
decides, so a seal that breaks its schema is S2 before its type is
read. Writers of this version write it empty, 22 bytes.
- The head (spec 29.4): layer 2 with its type tag and version 1;
layer 3 with the CDDL, R1 and R8; layer 4 in key order, the comment
and the declared author, each file with R2 to R6c, R10 and its
layout, R7 and R9 over the tree, all ERR_HEAD_INVALID, and then the
critical extensions of the new extension.Head object.
- ERR_HEAD_INVALID is declared; All lists it once SpecVersion moves to
0.10 with the test data, in step 6.
- The control tests take format 4 as the caller error that format 3
was, as section 76 of the spec anticipated.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The reference moves to the DateKeys Protocol Specification v0.9, approved
by its author on 29 September 2026. Encrypt writes capsule format 2 only;
Open and Inspect read formats 1 and 2, and a format 1 capsule keeps the
verdict v0.8.2 gave it.
Format 2 (spec §22, §29.1, §31, §39):
- VERSION in the PRELUDE is the capsule format, capsule.Format; any other
value is ERR_UNSUPPORTED_VERSION at step 2.
- CONTROL_CBOR has the schema version of its format. Version 2 adds key 6,
payload_length (8 bytes, big-endian, at most L_MAX = 2^53 - 2^46), and
key 7, padding (1 bloque256, 2 reforzado); it is 103 bytes without
extensions, whatever L.
- The payload is the content padded with zeros to P = rule(L). Step 17
checks the length and the zeros, and Open writes only the first L bytes.
- INNER_ACCESS_AGE holds exactly 16 X25519 stanzas: 1 to 16 credentials,
and a dummy in each slot left, in a uniformly random order.
Writer rules (spec §62.1): EncryptOptions.Length is required and the
source must deliver exactly that many bytes; recipients that are not
canonical or of low order are rejected (agewrap.CheckX25519Recipient);
self-checks of the header, the control, INNER_ACCESS_AGE and PAYLOAD_AGE.
The CLI measures its input, takes -padding and reports the format.
Test data: seven format 2 fixtures, padding vectors checked against
math/big, format 2 CBOR vectors, and the mutation corpus in both formats
with the 22 cases of the third list of spec §64, built without randomness
by sealing the fixtures again with their known keys and nonces. The
format 1 fixtures are kept byte for byte and never regenerated; the
differential corpus keeps its 1825 cases and adds a block per format 2
fixture. The spec copy loses its "to be implemented" markers, and the
READMEs, CHANGELOG, traceability and testdata/README.md follow v0.9.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Approved refinements, each recorded with its reproducible case in the
§76 v0.8.2 subsection:
- §69.1: layered error model with normative precedence (frame, type tag
and version, CBOR profile and CDDL, then fields with their own code in
ascending key order; across steps the §63 order decides), with a scope
paragraph for the optional steps 5, 6 and 8.
- §55.1: normative trust table per section (who can write it, from which
step it is bound, what it never proves); §72: security-relevant claims
go in CONTROL_CBOR or under a signature, .dkk data is advisory.
- §31/§54: extension arrays in strictly ascending unsigned byte order of
extension_id (one rule for order and uniqueness).
- Gaps a second implementation needed: §28.1 malformed age headers,
§15/§19 latest unlock time and dk1_ reading rules, §22/§23/§57 length
lower bounds, §63 step 8 tlock argument comparison and step 9 order,
§12.1 profile validation with the drand chain-hash formula, §74 table
of implementation limits.
Reference alignment: .dkk errors only at step 9.a (new
OpenOptions.AccessKeyFile, used by the CLI), CR/LF in dk1_ is
ERR_DATEKEY_INVALID, BODY_LEN 0 is ERR_INTEGRITY, nil identities are not
credentials, and AccessIdentity tries every identity on every stanza so
its verdict does not depend on their order. dk1.json gains three
vectors; every other testdata file is byte-identical.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Step 2b: package codec is rewritten without reflection or struct tags. A
strict Decoder accepts only the spec §58 profile, Unmarshal decodes,
re-encodes and compares, Peek reads the type tag and version, and Walk is a
bounded iterative helper for vectors and fuzzing. Every schema has its own
hand-written encoder and decoder that checks all CDDL rules before the
fields with their own error codes. github.com/fxamacker/cbor/v2 and
github.com/x448/float16 are gone; nothing replaces them. Valid objects
encode and decode exactly as before (1.34 million differential verdicts);
the invalid-input differences are documented in CHANGELOG and
traceability decision 12. A review found and fixed an access_policy check
that truncated to uint8.
Step 3: testdata gains vectors/cbor.json (generic and per-schema CBOR
vectors), vectors/mutations.json (the 55-case mutation corpus, replayable
offline), vectors/inspect_differential.json (1,825 fixed-seed mutations
with the Go verdict) and one inspect -json golden per fixture, all
regenerated byte-identically by genfixtures and documented in
testdata/README.md for second implementations.
Gate green with 90 s of fuzzing per target on all 15 targets; codec at
100 % coverage; pre-existing testdata byte-identical.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
- extension: data is an opaque []byte; New takes []byte and rejects empty
data; key 2 must be a non-empty shortest-form bstr; at most 64 extensions
per array; extension_version <= 2^32-1; CheckDisjoint is a linear merge;
optional DataValidator with ERR_EXTENSION_DATA_INVALID for known critical
extensions and Unusable reports for known noncritical ones.
- capsule, accesskey: frame limits on encode and decode with ERR_INTEGRITY;
Encrypt and MarshalBody decode their own output before sealing or
returning it; unusable extensions are reported.
- profile: period and genesis_time bounded to 2^53-1, genesis decoded as
unsigned.
- codec: Valid removed; empty values never encode as null.
- Regression tests for the nested-data seal/open asymmetry, the
nondeterministic verdict on NaN-keyed data and the quadratic disjointness
check; three new §64 mutations and five more.
- Fixtures: time_only_extensions regenerated with opaque data, new
time_and_key_portable_extension.dkk; genfixtures gains -only.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
The module is imported as g.activething.com/go/DateKeys, the path the
project's Gitea advertises. The .github directory is gone: workflows
now live in .gitea/workflows, use the gitea.com action mirrors and
install every tool from its Go module; releases go to this Gitea with
goreleaser and a key-based cosign signature; Dependabot is replaced by
a nightly report of available updates. scripts/check.sh runs the same
checks on any machine and is the gate while the server has no runner.
SECURITY.md, README and CONTRIBUTING no longer refer to GitHub.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
Reference implementation in Go, built from the implementation plan
(milestones M0 to M5): datekey, profile, provider, codec, agewrap,
extension, capsule, accesskey, the datekeys CLI, official vectors and
fixtures, the mutation corpus, fuzz targets, interop and live tests,
CI workflows, traceability and policy documents.
Co-Authored-By: Claude Fable 5.1 <noreply@anthropic.com>
dev