DateKeys-App/testdata

DateKeys test data

Official vectors, fixtures and corpora of the DateKeys Protocol Specification v0.10, generated by the reference implementation. Another implementation consumes them as they are: this file documents every format, so that no Go code has to be read. The rules that decide each verdict are in the specification; this file points to them, and states only what belongs to the files themselves.

go run ./internal/testkit/genfixtures -out testdata

regenerates everything except the .dkc and .dkk fixtures, which are generated once and frozen (spec §67). The records of each fixture (<name>.json, <name>.dkk.json, <name>.inspect.json) are recomputed from its frozen bytes, so the fixtures of v0.8.2 and v0.9 carry "spec": "0.10" and the fields added since. The local gate (scripts/check.sh) and CI run it and fail if any committed file changes: every file below is exactly what the implementation computes today.

Conventions for every file:

• JSON in UTF-8, with LF line endings. Binary values are lowercase hex strings.
• error, result and similar fields hold the normative codes of spec §69, such as ERR_NON_CANONICAL_CBOR.
• step is a step of the reading flow of spec §63, 1 to 18. Steps 1 to 8 are the pre-unlock checks (datekeys inspect, capsule.Inspect): no network, no secret.
• The spec field names the version of the specification.
• format is a capsule format, the VERSION of the PRELUDE (spec §22): 1, 2 or 3. A writer produces format 3 only; formats 1 and 2, those of v0.8.2 and v0.9, are still read (spec §70).

File	Content	Spec
vectors/profile_quicknet.json	Quicknet Provider Profile: its canonical CBOR and profile_hash	§11, §12
vectors/quicknet_rounds.json	date → round resolution	§15, §16, §65
vectors/dk1.json	canonical dk1_ strings, and rejected encodings with their code	§18, §19, §66
vectors/cbor.json	the CBOR profile, and one block of vectors per schema, CONTROL_CBOR in the three formats	§58, CDDL
vectors/tlock_ibe.json	H2 of the tlock IBE: the serialization of an element of GT	§63 step 11
vectors/padding.json	the padding of formats 2 and 3: P for each content length L, and the length of PAYLOAD_AGE	§29.1
vectors/paths.json	the paths of a format 3 head: the rules of one entry, and those of the paths of a head	§29.5
vectors/path_fold.json	the key of R7 of segments, and their NFD	§29.5, §29.5.1
vectors/head_schema.json	heads of format 3 and the result of decoding them	§29.4 to §29.6, §69.1
vectors/security.json	security areas of format 3 and their verdicts	§29.3, §29.7
vectors/mutations.json	the mutation corpus: the 169 mutations of §64 and further cases	§63, §64
vectors/inspect_differential.json	5110 mutations of fourteen fixtures with the verdict of steps 1 to 8	§63
fixtures/<name>.dkc, <name>.json	official capsules and every intermediate value	§67
fixtures/<name>.dkk, <name>.dkk.json	official access keys	§68
fixtures/<name>.plaintext	the content of each capsule: what the reader delivers in formats 1 and 2, without the padding of format 2, and in format 3 BODY, whose files its record lays out	§67
fixtures/<name>.inspect.json	the exact output of datekeys inspect -json for each .dkc	§63

There are twenty-one official capsules. Five are in format 1, the fixtures of v0.8.2, kept for compatibility: time_only, time_only_extensions, time_and_key_portable, time_and_key_recipients and empty_payload. Seven are in format 2, the fixtures of v0.9, kept for compatibility too:

Fixture	Policy	Credentials	L	Padding code	P
format2_time_only	time_only	—	78000	2, reforzado	79872
format2_time_only_bloque256	time_only	—	78000, the same content	1, bloque256	78080
format2_empty_payload	time_only	—	0	2	256
format2_time_only_extensions	time_only	—	34	2	256
format2_time_and_key_portable	time_and_key	a portable .dkk; 15 dummies	46	2	256
format2_time_and_key_recipients	time_and_key	a portable .dkk and three X25519 identities; 12 dummies	41	2	256
format2_time_and_key_sixteen	time_and_key	sixteen X25519 identities; no dummy	41	2	256

The first two have a P above 64 KiB, so their PAYLOAD_AGE has two STREAM chunks. format2_time_only_extensions carries a noncritical PUBLIC_HEADER extension and a noncritical CONTROL_CBOR extension. The release that opens each capsule, a published Quicknet signature, is in its <name>.json, so they all decrypt offline.

Nine are in format 3. Their plaintext file is BODY, L bytes: the frame, the security area, the head and the files (spec §29.2).

Fixture	Policy	Files	Comment	L	Padding code	P	Area	Verdicts
format3_single	time_only	1, nota.txt, with mtime	—	659	2	768	512	F0, S0
format3_tree	time_only	5 in three folders, one of 80000 bytes, one without mtime	two lines, and a declared author	84078	2	86016	512	F0, S0
format3_comment_only	time_only	—	two lines, the second with a TAB, and a declared author	636	2	768	512	F0, S0
format3_bloque256	time_only	1 of 20000 bytes	—	20644	1	20736	512	F0, S0
format3_time_and_key_portable	time_and_key, a portable .dkk and 15 dummies	1	—	688	2	768	512	F0, S0
format3_area_1024	time_only	1	—	1171	2	1280	1024	F0, S0
format3_security_v2	time_only	1	—	659	2	768	512	X
format3_signature_unsupported	time_only	1	—	659	2	768	512	F1, S0
format3_seal_unsupported	time_only	1	—	659	2	768	512	F1, S1

The first five are what capsule.EncryptFiles writes. The other four only a generator of test vectors may write (spec §62.1 rule 13): an area larger than the 512 bytes of this version, which a reader accepts, a security map of version 2, which a reader of this version cannot read, an author signature of alg 1 with a random key of 32 bytes and a random signature of 64, and that with a seal of seal_type 1 and a random token of 32 bytes. None of them has a verdict that stops the opening. The BODY of format3_tree is over two STREAM chunks, with its head in the first.

Edited files

mutations.json and inspect_differential.json give each mutated .dkc as edits of a base file, not as its full bytes:

{ "base": "time_only.dkc", "edits": [[4, 1, "04"]] }

• base is a file of testdata/fixtures. In mutations.json it may be absent: the base is then the empty file, and the single edit holds the whole capsule.
• An edit is [at, delete, insert]: the delete bytes at offset at of the base are replaced by the bytes of the hex string insert.
• The edits of one file refer to offsets of the unmodified base, are sorted by at and do not overlap. The result is therefore built in one pass: copy the base up to at, append insert, skip delete bytes of the base, go on with the next edit, and copy the rest of the base.
• [0, 78799, ""] on time_only.dkc is the empty file; "edits": [] is the base unchanged.

vectors/cbor.json

{
  "spec": "0.10",
  "walk": { "max_depth": 3, "max_len": 64 },
  "accept": [ { "name": "uint 2^53 eight bytes", "hex": "1b0020000000000000", "value": "9007199254740992" } ],
  "reject": [ { "name": "tag", "hex": "c101", "error": "ERR_NON_CANONICAL_CBOR" } ],
  "schemas": [ { "block": "extension", "schema": "public_header", "name": "65 extensions", "hex": "a600…", "result": "ERR_NON_CANONICAL_CBOR" } ]
}

Generic vectors: accept and reject

Each hex is checked as exactly one data item of the CBOR profile of spec §58: major types 0, 2, 3, 4 and 5 only; integers and lengths in their shortest form; definite lengths; map keys that are unsigned integers in strictly ascending order; valid UTF-8 text; nothing after the item. accept holds the inputs that pass, reject those that fail, all with ERR_NON_CANONICAL_CBOR.

The walk limits apply as well, as in the reference codec.Walk: containers nest at most max_depth deep (a scalar has depth 0, 81818100 has depth 3), and every byte string and text string has at most max_len bytes, every array at most max_len items and every map at most max_len entries. The vectors named "above max_len" or "above max_depth" fail on these limits only.

value is present for an accepted unsigned integer: a JSON number up to 2^53 − 1, and a decimal string above, so that no reader loses precision.

Among them: shortest-form boundaries, a200010101 (the two-key map {0: 1, 1: 1}), a text with a leading BOM, keys out of order or repeated, non-integer keys, indefinite lengths, tags, floats, simple values, negative integers, truncation, lengths beyond the input, trailing bytes, overlong UTF-8 and surrogates.

Schema vectors: schemas

Each vector is one encoded object:

• schema names the object and the decoder to run on hex:
  • provider_profile: a Provider Profile (§11), decoded and then validated as a profile to pin, by rules 1 to 3 of spec §12.1 in their order: the CDDL with the period limit of the reference, the field rules (ERR_UNKNOWN_PROFILE) and the chain-hash self-check (ERR_PROFILE_MISMATCH), whose formula §12.1 gives. No profile_hash is expected (rule 4). A vector that changes a hashed key recomputes chain_hash, unless its name says that the chain hash no longer matches.
  • public_header: PUBLIC_HEADER (§24). No profile registry is consulted and no extension is known: a header naming an unpinned profile is valid here (ERR_UNKNOWN_PROFILE comes from the registry at step 4), and critical extensions are not checked here.
  • control_cbor: CONTROL_CBOR (§31), decoded for the capsule format given by format, 1 when the field is absent: the schema version must equal it (another is ERR_UNSUPPORTED_VERSION, layer 2), and keys 6, payload_length, and 7, padding, are required in formats 2 and 3 and not defined in format 1. The names of the vectors of formats 2 and 3 start with "format 2: " and "format 3: ".
  • dkk_body: BODY_CBOR of a .dkk (§41), without the 12-byte DKK1 prelude.
• block names the schema the vector exercises: the same as schema, or verification_metadata (the .dkk body's key 6 varies) or extension (the PUBLIC_HEADER's key 6, noncritical_extensions, varies).
• result is ok or the error code.

When bytes break several rules, the code is the one of the first failing layer of spec §69.1: the type tag and the schema version, read first from keys 0 and 1 (layer 2), then the CDDL, the implementation limits included, and the re-encoding (layer 3), and only then the fields with codes of their own in ascending key order (layer 4). The objects of these vectors have no frame, so layer 1 does not apply, and their critical extensions are not checked (see above).

Each block has a minimal valid object, an unknown key, a missing required key, a wrong type and values out of size or range. The extension block has, besides: data 40 (empty) and 5801xx (length not in its shortest form), data of every other type (text, null, integer, map, array, tag, indefinite length), 64 and 65 extensions, an extension_id starting with a BOM, the pair U+FF61 and U+10000 in UTF-8 byte order (valid) and in UTF-16 order (invalid), and extension_version 2^32 − 1 (valid), 2^32 and 2^53 (invalid).

The control_cbor block has, besides, a key 6 in format 1, where it is not defined, and in format 2: the minimal control of 103 bytes (L = 0), payload_length 78000, 2^32 + 1 and L_MAX = 2^53 − 2^46 (valid), L_MAX + 1, 2^53 and 2^64 − 1 (invalid), a payload_length of 7 or 9 bytes, as an unsigned integer or with a length not in its shortest form, padding 1 (valid), 0, 3, 257 and as a byte string, a missing key 6 or 7, keys 6 and 7 out of order, an unknown key 8, and schema versions 1 and 3 (ERR_UNSUPPORTED_VERSION); and in format 3: the minimal control, both extension arrays, payload_length 84078 with padding 1 (valid), payload_length L_MAX + 1, a missing key 6 or 7, schema version 3 without keys 6 and 7, and schema versions 1, 2 and 4 (ERR_UNSUPPORTED_VERSION).

Implementation limits

The vectors apply the implementation limits of the reference that spec §74 lists: the maximum extension_id length, the Provider Profile period of one day, the maximum name lengths and the public_key length. The vectors named "the implementation limit" sit at a limit and are valid; those named "above the implementation limit" go one past it and are otherwise valid, so that an implementation without the limit accepts them. The name alphabets, the genesis_time range and the drand rules of the provider_profile validation are not limits: they are rules of spec §12.1. Neither is the minimum of one byte of extension_id (spec §31).

vectors/tlock_ibe.json

H2, the hash of an element of GT in the IBE-CCA with which tlock wraps FK_TIME: spec §63 step 11, and the paragraph "Serialización de GT en H2" after the flow.

{
  "spec": "0.10",
  "description": "…",
  "vectors": [
    { "name": "H2(e(G1, G2)), the generators of G1 and G2", "g1": "97f1…", "g2": "93e0…", "gt": "0f41…", "h2": "cb87319f24560b5231579a09ad79f12e" }
  ]
}

• g1, g2: a point of G1 and one of G2 in the canonical compressed encoding of spec §12.2, 48 and 96 bytes; the vector uses the generators.
• gt: e(g1, g2), the pairing of G1 × G2 of step 11, in 576 bytes. Over the tower Fp2 = Fp[u]/(u² + 1), Fp6 = Fp2[v]/(v³ − (u + 1)) and Fp12 = Fp6[w]/(w² − v), every element is written with its coefficients from the highest degree to the lowest: c1 then c0 for Fp12, c2, c1 and c0 for Fp6, c1 then c0 for Fp2, and each element of Fp in 48 bytes big-endian. It is the order of kilic/bls12-381, which drand/kyber and tlock use.
• h2: SHA-256 of the ASCII bytes IBE-H2 followed by gt, truncated to its first 16 bytes, the length of V.

A reader checks that its pairing of g1 and g2 serializes to gt and that its H2 of those bytes is h2; the vector fixes the pairing and the serialization at once. The same 576 bytes with the twelve coordinates of Fp in reverse order, c0 first at every level as Fp12.toBytes of @noble/curves writes them, give 0118eea9d5971745f71e3c94926f1717 and another FK_TIME.

vectors/padding.json

The padding of the payload of a capsule of format 2 or 3, spec §29.1, where L is the length of BODY in format 3: for each content length L, the length P of the plaintext of PAYLOAD_AGE with each code, and the length of PAYLOAD_AGE.

{
  "spec": "0.10",
  "l_max": 8936830510563328,
  "vectors": [
    { "l": 78000, "bloque256": 78080, "reforzado": 79872, "payload_age_bloque256": 78296, "payload_age_reforzado": 80088, "e": 16, "s": 5, "last_bits": 11 }
  ],
  "rejected": [8936830510563329, 9007199254740992]
}

• l: L, the length of the content.
• bloque256: P with code 1, 256 · ⌈L / 256⌉, at least 256. reforzado: P with code 2, the larger of that and Padmé.
• payload_age_bloque256, payload_age_reforzado: the length of PAYLOAD_AGE for each P, 184 + P + 16 · max(1, ⌈P / 65536⌉): an age header of one X25519 stanza (168 bytes), the 16-byte nonce, and the P bytes in STREAM chunks of 64 KiB with a 16-byte tag each.
• e, s, last_bits: the intermediate values of Padmé, E = bitlen(L) − 1, S = bitlen(E) and E − S; only for L > 256, and informative.
• l_max: L_MAX = 2^53 − 2^46, the largest L.
• rejected: lengths above L_MAX, which a writer rejects and which, as key 6 of a control, are ERR_NON_CANONICAL_CBOR.

Every number is below 2^53, so a JSON number holds it exactly. The lengths include both sides of the boundaries where 32-bit arithmetic breaks (2^31 − 2^25, 2^32 − 2^26, 2^32) and 2^49 − 1, the first L for which a floating-point logarithm gives an E one too large (P does not change).

vectors/paths.json and vectors/path_fold.json

The rules of the paths of a format 3 head, spec §29.5, with the tables of §29.5.1. Both files name the tables they were computed with: "unicode_version": "18.0.0" and tables_digest, the SHA-256 of the canonical text of the generated tables, which a second implementation that generates them from the same files can recompute.

{
  "paths": [ { "name": "TAB", "path": "a\tb", "result": "R4: segment 1: control U+0009" } ],
  "trees": [ { "name": "A.txt and a.txt", "paths": ["A.txt", "a.txt"], "result": "ERR_HEAD_INVALID", "detail": "R7: path 2 collides with path 1 in segment 1" } ]
}

• paths: one path and the rules of one entry, R2, R3, R4, R4b, R5, R6, R6b, R6c and R10, in that order; result is ok or the violation of the first rule that fails, as every implementation must word it: the rule, the segment when it is about one, and the character as U+ and at least four upper-case hexadecimal digits, never the text itself.
• trees: the paths of a head, each a file of 0 bytes, in the order given, and the result of decoding that head (see head_schema.json): R1 and R8 in layer 3 (ERR_NON_CANONICAL_CBOR), then each entry and R7 and R9 over the tree in layer 4 (ERR_HEAD_INVALID, with its detail).

Among them: U+00A0, accepted, and U+3000, refused by R6c, at both ends of a segment; the best-fit projections, the full-width forms of '/', '', ':' and '.', and CON.txt in full-width forms; 8.3 aliases, ~1 alone included; unassigned code points and noncharacters; U+206A to U+206F, the tags and other ignorables outside the whitelist; a dot followed by ZWJ and a segment of ZWJ alone; 127 and 85 times U+0390; U+F03A; .datekeys-x at the first level and at another; U+FF5E and U+1F600 in both orders; ab with and without ZWNJ; U+00BF, U+00A7 and U+2665, accepted; VS16 after U+2764 and after a; ZWJ at the start, at the end and twice; the rainbow flag, accepted, and the flag of Scotland, refused; and ["b/..", "a"], an error of R8 before R3.

path_fold.json gives, for each segment, its nfd and its key of R7, NFD(fold(NFD(s'))) with s' the segment without ZWNJ, ZWJ, VS15 and VS16: among them the entries F of CaseFolding, the dotless i, the Kelvin and Angstrom signs, Cherokee, Hangul, the canonical order of two marks, and the whitelist dropped before NFD.

vectors/head_schema.json

Heads of format 3, HEAD_CBOR, and the result of decoding them with no extension known (spec §29.4 to §29.6): ok, or the code of the first failing layer of §69.1. A head is decoded alone: the frame of BODY that bounds it and the files it lays out are not checked here (spec §63 steps 17.2 and 17.5).

{ "name": "a comment with U+202E", "hex": "a4006d…", "result": "ERR_HEAD_INVALID", "detail": "comment: text: bidirectional control U+202E" }

• Layer 2: the type tag and version 1; another type tag is ERR_NON_CANONICAL_CBOR, another version ERR_UNSUPPORTED_VERSION.
• Layer 3: the CDDL with its sizes and ranges, R1 and R8, and the equality with the re-encoding: ERR_NON_CANONICAL_CBOR.
• Layer 4, in key order: the comment and the declared author (§29.6), then each file with R2 to R6c, R4b and R10 and its layout, then R7 and R9 over the tree, all ERR_HEAD_INVALID, and then the critical extensions, ERR_EXTENSION_CRITICAL_UNKNOWN with no extension known.
• detail, for ERR_HEAD_INVALID only: the violation as every implementation must word it, comment: text: …, declared author: text: …, file N: … for an entry, counted from 1, or the violation of the tree.

Besides the cases of each layer, it has a comment with tags that spell a text, one with VS16 after a letter and one with a run of variation selectors, one with VS17, one with CR LF, and the precedence of a comment and a path that both break, and of a path that breaks and an unknown critical extension.

vectors/security.json

Security areas of format 3, SECURITY_CBOR exactly as its SECURITY_LEN bytes, and their verdicts (spec §29.3, §29.7), which never stop the opening. This version implements no alg and no seal_type, so a reader of it reaches X, F0, F1, S0, S1 and S2 only.

{ "name": "a signature of alg 0, and the seal intact", "hex": "a4006f…", "signature": "F1", "seal": "S1" }

X stands for both, when the outer map fails its layer 2 or 3: key 2 that is not a byte string, or an empty one, an unknown key 4, a byte more after the map, version 2, another type tag, keys out of order, an array. Otherwise the signature and the seal are evaluated apart, and the first row of the table of §29.7 that holds decides: alg 0, an empty key or content that is not CBOR give F1 with the seal intact, and a seal that breaks its schema gives S2 even with an unknown seal_type, which is read only from a seal that meets it.

vectors/mutations.json

The mutation corpus of spec §64, as frozen data. Each case is a .dkc, what the reader is given to open it, and the exact error and step at which the full reading flow (capsule.Open, §63) must fail.

{
  "name": "version changed",
  "spec": true,
  "dkc": { "base": "time_only.dkc", "edits": [[4, 1, "04"]] },
  "release": { "round": 1000, "signature": "b446…" },
  "now": "2023-08-23T15:59:24Z",
  "registry": "default",
  "network": false,
  "frozen": false,
  "error": "ERR_UNSUPPORTED_VERSION",
  "step": 2
}

• name: unique, stable.
• spec: true for the 169 mutations listed in spec §64, false for the further cases of the reference. The cases come in this order: the 33 mutations of the first two lists of §64 on the format 1 fixtures (cases 1 to 33), 32 further cases (34 to 65), the same 33 mutations on the format 2 fixtures, named "format 2: …" (66 to 98), the 23 of the list of format 2 (99 to 121), 5 further cases (122 to 126), the same 33 on the format 3 fixtures, named "format 3: …" (127 to 159), the 47 of the list of format 3 (160 to 206), and 3 further cases (207 to 209). A line of the lists of §64 with several values, such as "AREA_LEN 0, 511, 513 o 66048", is one case for each.
• dkc: the capsule, as edits of a fixture (see above). The reader gets it as a seekable file, so that the capsule_digest of an offered .dkk is checked before any release request (spec §63 step 9.a).
• dkk: the hex of a complete .dkk file (prelude and body) offered as the access credential; absent when none is offered.
• identities: age X25519 identities (AGE-SECRET-KEY-1…) offered as access credentials; absent when none.
• release: what the release source answers to every request, whatever round is asked for. The reader must verify it (§51): a case may serve a release of another round, a round with the signature of another, or a signature that is not the canonical encoding of a point (§12.2). null means that no release is available (ERR_RELEASE_UNAVAILABLE). The release is supplied directly, as the caller's own, so one that breaks the rules of step 10 gets the code of step 10; a source that fetched it over a network would have discarded it, and the code would be ERR_RELEASE_UNAVAILABLE at step 9 (spec §63 steps 9 and 10).
• now: the reader's clock, RFC 3339. No release is requested before the round time of the DateKey.
• registry: default pins exactly the Quicknet profile of profile_quicknet.json; empty pins none.
• extensions: the extensions the application implements. Each entry is known at (id, version), and its data is valid only when it equals the bytes of valid_data. Each entry is registered in both arrays of every object (§72), as a Go extension.Registry that does not implement extension.Placement: an extension outside its registration counts as unknown there (§54), so the cases "known critical PUBLIC_HEADER extension with invalid data", "known critical CONTROL_CBOR extension with invalid data" and "known critical .dkk extension with invalid data", at steps 4, 14 and 9, depend on it. Absent: the application knows no extension, the state of the base protocol V1.
• network: whether the failure may come after a release request. When false, the reader must fail without requesting any release (§27, §63): every failure of steps 1 to 8 and of step 9 before the request (9.a to 9.c).
• frozen: the capsule was built once with age randomness; its bytes are kept and never regenerated. These cases have no base.
• error, step: the expected code and the step of §63 that fails. For a capsule that opens, error is ok, step is 0 and verdicts holds the verdicts of its security area, signature and seal, with the lines that show them (spec §29.7): the three cases of security of the list of format 3.

Every case reproduces offline: the recorded release stands in for the network. A reader that implements only steps 1 to 8 can replay every case whose step is at most 8: 57 cases, 39 of them from §64. Steps 1 to 8 are summarised in "The checks of steps 1 to 8" below.

Credentials and the release: step 9

What happens between step 8 and the release request is spec §63 step 9: for time_and_key only, an offered .dkk is checked as an object and then bound to the capsule (9.a), at least one credential must be offered (9.b), and for either policy a now before the round time of the DateKey fails without a request (9.c); only then is the release requested. For time_only the credentials play no part: the §64 case "access_policy=time_only with time_and_key structure" offers a .dkk whose capsule_digest is that of the unmutated capsule, and fails at step 12, not at step 9. The codes after the request, for the release (step 10) and for the identities that open each age file (steps 11, 13 and 17), are those of spec §63 as well. In this corpus:

• identities are not examined before the release (spec §63 step 13);
• a release of null is ERR_RELEASE_UNAVAILABLE at step 9;
• every release is supplied directly, so an invalid one fails at step 10: the source is not a network source, which would discard it at step 9;
• every .dkk offered decodes: the corpus checks step 9.a, not the decoding of a .dkk, whose errors spec §63 also places at step 9.a.

Point encodings: steps 10 and 11

Ten cases of §64, in each format, test the canonical point encoding of spec §12.2 and the tlock stanza body U || V || W of spec §63 step 11:

• five edit the tlock stanza body of time_only.dkc: U with c0 + p, U the point at infinity (the byte 0xc0, then zeros), U with the infinity flag over its own coordinate bits, and bodies of 127 and 129 bytes. Each recomputes the header MAC of OUTER_TIME_AGE with FK_TIME, so the age header stays authentic and only the rules of step 11 reject the capsule (ERR_INTEGRITY); a reader whose decoder reduces coordinates modulo p opens the first one;
• three serve the release of time_only.dkc with its signature edited: the point at infinity, the infinity flag over its own coordinate bits, and the negated signature (the sort flag flipped: a canonical point that does not verify); a fourth serves the published signature of round 1004 re-encoded as x + p, over a frozen capsule for round 1004, because no fixture round has a signature whose x + p fits in 381 bits. All four fail at step 10 (ERR_RELEASE_INVALID);
• the last one serves the negated signature with U with c0 + p: step 10 comes first.

In format 2 the same ten edit format2_time_only.dkc and its release, and the x + p case has a frozen format 2 capsule for round 1004.

Format 2: its list of §64

The 23 cases of the list of format 2 of §64 test what format 2 adds:

• the format against the rest of the capsule, with another VERSION, a public byte (§22, §76): a format 1 time_and_key capsule of one stanza relabeled format 2 fails at step 12, and the other relabelings, format 2 as 1 or 3 and format 1 as 2, at step 14, where the schema version of the control is not the format;
• the 16 stanzas of INNER_ACCESS_AGE: 15, 17, two for one recipient, and an identity that opens none of them, at steps 12 and 13;
• keys 6 and 7 of CONTROL_CBOR, at step 14;
• the plaintext of PAYLOAD_AGE, at step 17: a padding byte that is not zero, a plaintext of P − 1 or P + 256 bytes or without its padding, and a control that declares another code or another L.

Each derives from a fixture without randomness. What it changes is sealed again with the file keys that the release and the credentials of the fixture open, FK_TIME and FK_ACCESS, or that its I_PAYLOAD unwraps, FK_PAYLOAD, and with the nonces of the fixture; a stanza it adds takes its ephemeral scalar from a fixed seed. So each case is a base with edits, and regenerates byte for byte. A case that changes a time_and_key capsule offers the identity of its .dkk, because the .dkk itself would fail at step 9.a: its capsule_digest no longer matches. Five further cases, 122 to 126, offer the .dkk and show that.

Format 3: its list of §64

The 47 cases of the list of format 3 of §64 test what format 3 adds, all at step 17 but the first:

• VERSION 2 on a format 3 capsule, at step 14 (VERSION 4 is "format 3: version changed", as in format 2);
• the frame of BODY and the area (§29.2): each value of AREA_LEN, SECURITY_LEN and HEAD_LEN that §64 lists, a frame that does not fit in L, L < 12, a byte of the area that is not zero, all ERR_INTEGRITY;
• the head (§29.4 to §29.6): its version and type tag, a byte more within HEAD_LEN, R8 and R1 in layer 3, and in layer 4 the paths, the comment, the declared author, the layout and the tree, 65536 implicit folders included;
• the files: the end of the last file that is not C, and a byte of a file changed, ERR_INTEGRITY;
• the precedence of the end of step 17: a path .. with a padding byte that is not zero is ERR_HEAD_INVALID, but with the next STREAM chunk corrupt, or with PAYLOAD_AGE cut right after the chunk that holds the head, it is ERR_INTEGRITY;
• three cases of security that open, without a code, with the verdicts X, F1 and S1.

They derive from format3_single, and the two that need a head followed by another chunk from format3_tree. What a case changes in BODY is sealed again with FK_PAYLOAD and the nonce of its fixture, followed by the zeros of the padding up to the P of its L, and when L changes the control is sealed again with the new L, as anyone can seal the control of a time_only capsule (spec §36.1). The case of 65536 implicit folders carries a head of 235 KB, 2115 paths, all but the last of 32 segments; it is most of the size of the file. The three further cases relabel format 3 as 1, and a time_and_key capsule as 2 with its identity and with its .dkk.

The checks of steps 1 to 8

mutations.json and inspect_differential.json follow the rules of the specification for steps 1 to 8, with the default registry (Quicknet pinned), no extension known unless a case lists some, and no secret. The first failure ends the flow, and within one object the first failing layer decides the code (spec §69.1):

Step	Rules	Spec
1, 2	magic, truncated prelude, VERSION 1, 2 or 3 (the format), FLAGS and RESERVED, PUBLIC_HEADER_LEN in 1 to 1048576 and SEALED_CONTROL_LEN in 1 to 67108864	§22, §23
3	the PUBLIC_HEADER bytes are present	§23
4	PUBLIC_HEADER: layers 2 to 4, the public_header decoder of the schema vectors, then the pinned profile of the DateKey and the critical extensions; with no extension known, every critical_extensions array fails	§63, §69.1
5	the SEALED_CONTROL bytes are present, then its age header, parsed within SEALED_CONTROL_LEN bytes: malformed is ERR_INTEGRITY, one tlock stanza is required	§28.1
6	the age header of PAYLOAD_AGE, from its offset to the end of the file: malformed is ERR_INTEGRITY, one X25519 stanza is required	§22, §28.1
7	the round time of the DateKey is at most 9999-12-31T23:59:59Z (Quicknet: round 83903165811 at most); a dk1_ round above it passes step 4 and fails here	§15
8	the tlock stanza has exactly two arguments, the canonical decimal round and the lowercase hex chain hash, compared as strings	§63 step 8

The reference parses age headers with filippo.io/age v1.3.2, whose parser limits (1024 stanzas, 128 arguments after the type, 2 MiB) spec §74 lists as implementation limits. No case of these corpora depends on them.

vectors/inspect_differential.json

A differential corpus of the pre-unlock checks: 5110 deterministic mutations of fourteen official .dkc fixtures, 365 of each, with the verdict of steps 1 to 8 of §63 as the reference computes it (capsule.Inspect with the default registry, no extension known, no network, no secret), by the rules that "The checks of steps 1 to 8" above points to. The first 1825, those of the five format 1 fixtures, are the corpus of v0.8.2 unchanged; the seven format 2 fixtures follow, and then two of format 3, format3_single and format3_time_and_key_portable, one for each policy: steps 1 to 8 see nothing of format 3 that format 2 does not have, but VERSION. The format field of the file describes the layout below in words; it is not a capsule format.

{
  "seed": 20260925,
  "bases": [ { "file": "time_only.dkc", "sha256": "99e9…" } ],
  "mutations": [
    {"base":0,"kind":"flip","edits":[[121,1,"b3"]],"result":"ERR_NON_CANONICAL_CBOR","step":4},
    {"base":0,"kind":"flip","edits":[[725,1,"4d"]],"result":"ok"}
  ]
}

• bases: the fixtures, with the SHA-256 of their exact bytes. base in a mutation is an index into this list.
• edits: see "Edited files".
• result: ok when steps 1 to 8 pass, or the error code; step is the step that failed, absent when ok.
• kind names the generator and is informative: flip (one bit), byte (one byte replaced), truncate, insert and delete (one to four bytes), length (PUBLIC_HEADER_LEN and SEALED_CONTROL_LEN), header (PUBLIC_HEADER re-encoded with one CBOR-aware change: a key removed, added or retyped, the type tag, version, capsule_id, DateKey or access_policy changed, an extension array added, a head not in its shortest form, keys out of order or repeated, the whole item tagged, wrapped, made indefinite, truncated or followed by bytes), datekey (the DateKey string alone), age (the age header of SEALED_CONTROL or PAYLOAD_AGE edited: intro line, stanza type, arguments, stanzas added or removed, body lines, MAC line, line endings). Most header, datekey and SEALED_CONTROL age mutations also rewrite the prelude lengths to match; some keep the old ones on purpose.
• seed seeds the generator of the reference and is informative too: every mutation is stored explicitly.

fixtures/<name>.inspect.json

For each official .dkc, the exact bytes that datekeys inspect -json -in <name>.dkc prints when run in testdata/fixtures: JSON indented with two spaces, fields in this order, and a final newline. The pre-unlock checks use the default registry.

Field	Content
file	the -in argument, <name>.dkc
format	the capsule format, once step 2 has passed
capsule_id	hex, once step 4 has decoded the header
datekey, profile, round	the canonical dk1_ string, its profile and round
unlock_at	the round time of the DateKey, RFC 3339 in UTC, once step 7 passes
access_policy	time_only or time_and_key
valid	true when steps 1 to 8 pass
error	the code of the failure, absent when valid
checks	one entry per step run: step, name, ok, detail (free text) and, for a failed step, error

detail is informative text of the reference; a second implementation compares at least step, name, ok and error, and every other field.

Existing vectors and fixtures

• vectors/profile_quicknet.json: the Quicknet profile fields, canonical_cbor (hex) and profile_hash.
• vectors/quicknet_rounds.json: vectors of requested instants (RFC 3339 with nanoseconds) and the resolved round and effective time, or error.
• vectors/dk1.json: valid vectors with network, round, canonical_json, base64url and dk1; invalid ones with input and the error code (accepted would mean the input decodes).
• fixtures/<name>.json: for each .dkc, its format, its SHA-256, the release that opens it, the hex of the prelude, PUBLIC_HEADER and CONTROL_CBOR, the DateKey, capsule_id, header_binding, payload_identity (I_PAYLOAD, a test secret), the visible stanzas of each age file, the identities or .dkk that open it, payload_length (L), the exact extension data, and the result of every step of §63. In format 2 it adds padding (the code) and padded_length (P) and, for time_and_key, access_key_stanza and identity_stanzas: the index, from 0, in inner_stanzas of the stanza that the .dkk and each identity of identities, in order, open. The other stanzas are dummies; the official vectors are the only place where that is recorded (spec §39). In format 3, as in format 2, with payload_length the length of BODY, it adds area_len, security_cbor, head_cbor, salt, comment, declared_author, head_extensions, content_offset, the offset of the files in BODY, 12 + AREA_LEN + HEAD_LEN, files, each with its path, size, start, end, sha256 and mtime when it has one, its bytes being those of BODY from content_offset + start to content_offset + end, and verdicts, with signature, seal and the lines that show them.
• fixtures/<name>.dkk.json: for each .dkk, its SHA-256, credential_id, capsule_id, access_type, access_material (a test secret), capsule_digest, extensions and the capsule it opens.