From 889bcbc42c816d60bac8571e7512cb01553a4553 Mon Sep 17 00:00:00 2001 From: Transaction Science Date: Wed, 21 Oct 2026 12:46:31 -0400 Subject: [PATCH 1/5] wai.media.contribution: sessions, steps, the authorship map and its checks (extension, wai-rs module, corpus) The extension text (extensions/contribution.md), the reference module behind the contribution feature, its corpus generator and test, and the generated corpus. Co-Authored-By: Claude Opus 5.5 --- wai/extensions/contribution.md | 760 +++++ .../contribution/vectors.json | 2919 +++++++++++++++++ wai/wai-rs/Cargo.toml | 19 + .../src/bin/wai_contribution_vectors.rs | 74 + wai/wai-rs/src/contribution.rs | 2002 +++++++++++ wai/wai-rs/src/contribution/corpus.rs | 822 +++++ wai/wai-rs/src/lib.rs | 8 + wai/wai-rs/tests/contribution.rs | 61 + 8 files changed, 6665 insertions(+) create mode 100644 wai/extensions/contribution.md create mode 100644 wai/live-conformance/contribution/vectors.json create mode 100644 wai/wai-rs/src/bin/wai_contribution_vectors.rs create mode 100644 wai/wai-rs/src/contribution.rs create mode 100644 wai/wai-rs/src/contribution/corpus.rs create mode 100644 wai/wai-rs/tests/contribution.rs diff --git a/wai/extensions/contribution.md b/wai/extensions/contribution.md new file mode 100644 index 000000000..4fe560260 --- /dev/null +++ b/wai/extensions/contribution.md @@ -0,0 +1,760 @@ +# WAI Extension: Contribution Records + +> Status: Draft. Registers the record `wai.media.contribution`: who contributed what to a piece +> of media made by people and models together, and how much, computed from the process that +> made it. A tool signs a **session** naming its parties: people, each by a key and each +> countersigning its own membership, and models, each by its digest. Every act in the session +> is a signed **step** in a hash chain: a person authors or edits samples, a model generates, +> proposes candidates or inpaints a marked region, a party selects one candidate, transforms a +> state with a pinned derivation, composes layers, or rejects an output. Each act has a +> **dependency rule**, and re-executing the steps gives, for every sample of the output, the +> parties whose act produced its value (`made_by`) and the parties whose choices conditioned it +> (`directed_by`): the **authorship map**, computed rather than declared. A verifier checks +> what the steps say: that an edit or an inpainting changed no sample outside its region, that a +> selected output is a member of the set it was chosen from and that each candidate regenerates +> from its seed, that a transform recomputes, that the map recomputes, and that the output's +> origin claim ([synthesis](synthesis.md)) is at least what the map implies. The steps are the +> leaves of a Merkle tree, so a creator can disclose some of them with inclusion proofs; a +> prompt is a salted commitment until its creator opens it; and the outcome says which **tier** +> the disclosure reaches: `recomputed`, `checked` or `stated`. A sample whose label no disclosed, +> pinned rule fixes is **unknown** or **undisclosed**, never attributed to anyone, and the +> shares are sample counts per party, never one blended figure. No new transport. The reference +> implementation is the `contribution` module of `wai-rs` (feature `contribution`); the corpus +> is [`live-conformance/contribution/`](../live-conformance/contribution/), and its second +> implementation is `live-conformance/contribution_verify.py`. +> Keywords **MUST**, **MUST NOT**, **SHOULD**, **MAY** are RFC 2119/8174. +> +> Texts read for this revision, each pinned to the version named: the C2PA Technical +> Specification, version 2.4 (April 2026), §10.2.3.2, §18.2, §18.15.1, §18.15.2 and §18.15.4; +> the Creator Assertions Working Group's Identity Assertion, version 1.2 (ratified 15 December +> 2025), §5.1, §5.1.2, §6.1 and §8; the IPTC Digital Source Type vocabulary as released on +> 2024-10-23; arXiv 2609.07711, §3.4; arXiv 2601.10236; and *Copyright and Artificial +> Intelligence, Part 2: Copyrightability*, a report of the United States Copyright Office +> (January 2025), Parts II.C to II.F and V. A section number of one of those texts in this +> extension is that version's. + +## 1. Scope + +In scope: the records (§2) and the session with its parties (§3); the steps, the acts and their +pinned operations (§4); the chain of steps and its Merkle tree (§5); the contribution record +(§6); the authorship map, its dependency rules, its encoding and its shares (§7); disclosure +and the privacy of process (§8); agreement with an origin claim and the mappings onto C2PA +actions, identity assertions and live tracks (§9); verification (§10). + +This revision maps still images of `RGB8` samples in full. Audio maps by sample interval and +video maps by frame are not part of it: a session's `media` is `image` (§3.1), and a later +revision registers the other media with their canonical buffers. + +Out of scope, each a slot a later revision fills: + +- **Legal questions.** WAI decides none. A registration authority, a collective or a court + applies its own rule, case by case, to facts. The cited report treats as relevant the uses of + a system as a tool (Part II.C), prompts (II.D), a person's expressive inputs (II.E), and the + selection, arrangement and modification of generated material (II.F), and concludes that a + work may be protected where a person was able to determine the expressive elements it + contains (Part V). A contribution record states, sample by sample, which party's act produced + each value and which parties' choices conditioned it, and how much of that a verifier + recomputed. It does not say which of those facts make anyone an author anywhere. Registering + a work, and contacting any authority about it, are its owner's decisions. +- **Tooling and presentation** of the map (later revisions' tools). +- **Aggregating an audience's choices** into one act: an `audience` party may act alone in this + revision (§3.1), and a step on behalf of many is a later revision's. +- **Direction tracks**: the act `direct` is reserved (§4.2) and refused until registered. +- **Attribution through conditioning**: a generation conditioned on an earlier state, and what + an inpainting reads outside its region, attribute nothing here. `generate` and `candidates` + take no input in this revision (§4.2). + +Relationship to the core spec: `wai.media.contribution` is a **record** ([SPEC](../SPEC.md) +§5): signed records a WAI tool emits and verifies. It names no payload format and is not +dispatchable. + +Relationship to [synthesis](synthesis.md): an origin claim says what an object is; a +contribution record says how it was made and by whom, sample by sample. The record names the +output's origin claim, and a verifier holds the two to each other (§9.1). This extension takes +synthesis §2's encodings and its two integer derivations by name. + +Relationship to [deriving-edge](deriving-edge.md): a transform or a composition of this +extension evaluates one of that extension's operations (§4.2 there) by its name, its parameters +and its arithmetic, over states of a session rather than over delivered objects, with no +envelope written. A deriving edge's record chains published objects; a session's steps chain the +states of one piece of work. + +## 2. Records + +Every record of this extension is a JSON object (RFC 8259) under the encodings of +[jwp-receipts](jwp-receipts.md) §2.4.3, read as synthesis §2 reads a record: strict JSON, no +member named twice, at most 32 levels of nesting, byte strings in lowercase hexadecimal, +integers unsigned and at most 2^53 − 1, no other number, no boolean, **terms** and +**date-times** as defined there. Each record has exactly the members its section lists, no +member missing and none added, at any level, and a `kind` naming it; one that does not is +`record_malformed`. So is a member outside the values or ranges its section gives. + +A signed record carries `signer_pubkey` (32 bytes, an Ed25519 key of RFC 8032) and `sig` +(64 bytes): + +``` +sig = Ed25519(signer_key, "wai:contribution\x01" || JCS(record without "sig")) +link_hash = BLAKE3("wai:contribution-link\x01" || JCS(record)) +``` + +JCS is RFC 8785. The signature is verified strictly ([SPEC](../SPEC.md) §7 *Signatures*): a key +that fails step 1 or 2 is `bad_key`, and a signature that fails a later step `bad_signature`. A +record is named by its link hash wherever another names it. `issued_at` holds the instant its +signer signed it, self-asserted. + +A **state** is a picture a step produces: `width` × `height` pixels as the `RGB8` buffer of +[reconstruction-binding](reconstruction-binding.md) §2 (row-major, three bytes a pixel, no row +padding), each side at least 1 and the buffer at most 2^26 bytes. Its **samples digest** is +SHA-256 (FIPS 180-4) over the buffer, and a state is named by it and by the step that produced +it. A pixel is addressed (*x*, *y*), *x* to the right and *y* down from the top-left. A +**sample** of the map is a pixel. + +## 3. The session + +### 3.1 The session record + +The tool a session runs in signs a **session** record, `kind` `"wai-session"`: + +| member | type | meaning | +|---|---|---| +| `kind` | string | `"wai-session"` | +| `session` | 32 B hex | fresh random bytes naming the session | +| `tool` | term | the tool, as a C2PA `softwareAgent` names it (§9.2) | +| `media` | string | `image` | +| `parties` | array | 1 to 64 parties, each named by its position from 0 | +| `issued_at` | date-time | when the tool signed it | +| `signer_pubkey`, `sig` | | §2: the **tool's key** | + +A party is one of: + +- `{"role": "human", "key"}`: a person, by the Ed25519 key it signs with (32 bytes; as a + `did:key` it is the same key); +- `{"role": "audience", "key"}`: a person in an audience, by its key; +- `{"role": "model", "digest", "type"}`: a model, by its prior's digest (SPEC §3.1), or, for + a generator that reads one model file and names it by SHA-256 (SPEC §5 *Payload of + `wai.generate.spectral`*), by that file's SHA-256; and `type`, `trained` or `algorithmic` + as synthesis §3.1 has a model's type. + +A human or an audience party is a **keyed** party. No key appears twice, no digest twice, and +no keyed party's key is the tool's (`record_malformed`): a person's act is signed by the +person's key, which the tool holds no copy of. + +### 3.2 Membership + +A keyed party **countersigns** its membership: it signs a **membership** record, `kind` +`"wai-membership"`, over the session as the tool signed it: + +| member | type | meaning | +|---|---|---| +| `kind` | string | `"wai-membership"` | +| `session` | 32 B hex | the link hash of the session record | +| `party` | integer | its own position among the parties | +| `issued_at` | date-time | when it signed it | +| `signer_pubkey`, `sig` | | §2: the party's key | + +A membership whose `session` is not the session's link hash, whose `party` is not a keyed +party, or whose signer is not that party's key is `membership_invalid`. A keyed party with no +membership is `party_not_countersigned`: no person is enrolled as a party of a session, and so +as a maker or a director of any sample (§7), without its own signature over the session's +parties. A model party signs nothing; the tool signs its acts (§4.1). + +## 4. Steps + +### 4.1 The step record + +Each act is a **step**, `kind` `"wai-step"`: + +| member | type | meaning | +|---|---|---| +| `kind` | string | `"wai-step"` | +| `session` | 32 B hex | the link hash of the session record | +| `seq` | integer | the step's position in the session, from 0 | +| `prev` | 32 B hex or `null` | the link hash of step `seq` − 1; `null` for step 0 | +| `party` | integer | the party that performed the act (the **performer**) | +| `act` | string | §4.2 | +| `inputs` | array | 0 to 16 states, each `{"step", "samples"}`: the `seq` of the step that produced it, below this step's `seq`, and its samples digest; none twice | +| `output` | object or `null` | what the act produced (§4.2) | +| `region` | array or `null` | for `edit` and `inpaint`, 1 to 256 rectangles `{"x", "y", "w", "h"}`, `w` and `h` at least 1, each within the output (`x` + `w` ≤ `width`, `y` + `h` ≤ `height`); the **region** is their union. `null` for every other act | +| `params` | object | §4.3 | +| `check` | string | `replicate` or `attest` (§4.4) | +| `issued_at` | date-time | when it was signed | +| `signer_pubkey`, `sig` | | §2: the performer's key for a keyed performer, the tool's key for a model | + +An `output` is `{"samples", "width", "height"}`, one state; for `candidates` it is `{"set", +"width", "height"}`, a set of 2 to 16 states of one size by their samples digests, none twice; +for `reject` it is `null`. + +A step whose `session` is not the session's link hash is `session_mismatch`; whose `party`, or a +party its `params` name, is not a party of the session, `party_unknown`; whose performer's role +is not one its act admits (§4.2), `party_role_mismatch`; and whose signer is not the one this +section names, `signer_mismatch`. + +### 4.2 Acts + +| act | performer | inputs | output | region | what it introduces | +|---|---|---|---|---|---| +| `author` | `human` | none | one state | none | every sample: the person's own | +| `generate` | `model` | none | one state | none | every sample | +| `candidates` | `model` | none | a set | none | every sample of every member | +| `select` | any party | one: a member of a `candidates` step's set | one state: the input | none | nothing | +| `edit` | `human` | one | one state of the input's size | required | the region's samples: the person's own | +| `inpaint` | `model` | one | one state of the input's size | required | the region's samples | +| `transform` | any party | one | one state | none | nothing | +| `compose` | any party | 1 to 16 | one state | none | the canvas fill (§4.5) | +| `reject` | any party | one | none | none | nothing | +| `direct` | reserved | | | | | + +- **author**: samples a person made enter the session: a drawing, a recording, typed text set + as an image. +- **generate**: a model produces a state. +- **candidates**: a model produces a set of states, committed by their digests and, where the + generator is pinned, by their seeds. +- **select**: a party picks one member of a committed set. Its output is that member. +- **edit**: a person replaces samples inside the region with samples it made. +- **inpaint**: a model fills the region a party marked. +- **transform**: a derivation, with parameters a party chose, maps one state to another. +- **compose**: a party places layers on a canvas, or tiles them in a grid. +- **reject**: a party discards a state. The state stays committed, so a verifier sees what was + discarded as well as what was kept. +- **direct**: reserved for direction tracks. A step whose `act` is `direct` is `act_reserved`. + +A step that breaks the table's inputs, output or region is `record_malformed`; an input of a +`select` that is not a member of a `candidates` step's set, or a `select` whose output is not its +input, is `selection_not_in_set` (§10.2 step 6). + +### 4.3 Parameters + +A step's `params` has exactly these members: + +| act | `params` | +|---|---| +| `author` | `{"source"}`: what the person made, as synthesis §3.2 has a capture state it: `digitalCapture`, `computationalCapture`, `screenCapture` or `digitalCreation` | +| `generate` | `{"generator", "prompt", "prompt_by", "seed", "steps"}` | +| `candidates` | `{"generator", "prompt", "prompt_by", "seeds", "steps"}` | +| `inpaint` | `{"generator", "prompt", "prompt_by", "mask_by", "seed", "steps"}` | +| `select`, `edit`, `reject` | `{}` | +| `transform`, `compose` | `{"derivation", "params"}`: a term naming the derivation, and an object, its parameters | + +- `generator`: a term naming what generated: `wai.generate.spectral` (§4.5) or another. +- `prompt`: the salted commitment to the prompt (§8.1), 32 bytes, or `null` for none. +- `prompt_by`: the party that wrote the prompt; `null` exactly when `prompt` is. +- `mask_by`: the party that marked the region. +- `seed`, `steps`: integers or `null`; `seeds`: an array of one integer per member of the set, + in the set's order, or `null`. + +### 4.4 The check + +A step's `check` says whether every sample it carries forward is fixed by a pinned rule: + +- `replicate`: every sample the act carries from its inputs recomputes from them under an + operation this revision pins (§4.5), and every sample a model introduces regenerates under a + pinned generator. Samples a person introduces (`author`, an `edit`'s region) are that person's + own, the source the chain starts from, as a capture is in synthesis §3.2: there is nothing to + recompute, and the signature says who made them. +- `attest`: a step that is not `replicate`: what it produced rests on its signer's statement. + +| act | `check` | +|---|---| +| `author`, `edit`, `select`, `reject` | `replicate` | +| `generate`, `candidates`, `inpaint` | `replicate` when `generator` is `wai.generate.spectral`; `attest` otherwise | +| `transform` | `replicate` when `derivation` is one §4.5 pins for it; `attest` otherwise | +| `compose` | `replicate` when `derivation` is `wai.derive.overlay_composition` or `wai.derive.grid_composition`; `attest` otherwise | + +A step whose `check` is not its act's is `check_mismatch`. A `replicate` step's parameters are +those §4.5 gives its operation; a `generate`, `candidates` or `inpaint` step of +`wai.generate.spectral` has a `seed` (each of its `seeds`) from 0 to 2^32 − 1 and `steps` from 1 +to 64, and its output's sides are each at most 4096 with `width` · `height` at most 2^23, the +ranges SPEC §5 *Payload of `wai.generate.spectral`* gives an instruction object. Otherwise +`params_invalid`. An `attest` step's `params` under `derivation` is any object. + +### 4.5 The pinned operations + +Each operation computes its output from its inputs' samples and its parameters, and defines, +for each output pixel, the input pixels it reads: its **sample mapping**, which the map follows +(§7.2). + +Transforms: + +- `wai.derive.crop` `{"x", "y", "w", "h"}`, `wai.derive.rotation` `{"quarter_turns"}` and + `wai.derive.mirror` `{"flip"}`: deriving-edge §4.2's, its parameters and its arithmetic + exactly. Each output pixel reads the one input pixel that section copies to it. +- `wai-synthesis:upscale2` and `wai-synthesis:denoise3`, `{}`: synthesis §4.1 and §4.2. Output + pixel (2*x*, 2*y*) of the upscale reads in(*x*, *y*); (2*x* + 1, 2*y*) reads it and + in(*x*₁, *y*); (2*x*, 2*y* + 1) reads it and in(*x*, *y*₁); (2*x* + 1, 2*y* + 1) reads those + and in(*x*₁, *y*₁), with *x*₁ and *y*₁ as there. Each output pixel of the denoise reads the nine + clamped pixels of its neighbourhood. +- `wai-contribution:lut` `{"table"}`, `table` 768 bytes: out(*x*, *y*) byte *c* = `table`[256 · + *c* + in(*x*, *y*) byte *c*], for *c* 0, 1, 2. Each output pixel reads the input pixel at its + own position. It is a value transform: a colour grade, a tone curve, a levels adjustment. No + other WAI text pins a per-sample colour mapping, so this extension pins this one. + +Compositions, over the step's inputs in its order: + +- `wai.derive.overlay_composition` `{"width", "height", "fill", "at"}` and + `wai.derive.grid_composition` `{"columns", "rows"}`: deriving-edge §4.2's. A pixel an input + covers reads the pixel of the last input that covers it; a pixel of an overlay's canvas that no + input covers reads nothing and holds the `fill`. + +Generation, for `generate`, `candidates` and `inpaint`: + +- `wai.generate.spectral`: the reference generator SPEC §5 *Payload of `wai.generate.spectral`* + names, `generate(model, prompt, seed, steps, h, w)`, with the performer's model file (whose + SHA-256 is the party's `digest`), the opened prompt's text (§8.1), the empty string where + `prompt` is `null`, and `h` and `w` the output's. A `candidates` member at position *k* of the + set is made with `seeds`[*k*]. An `inpaint` makes the picture at the input's size and copies its + samples inside the region; outside the region, the output is the input. + +A parameter the inputs cannot satisfy (a crop outside its input, grid inputs of different +sizes, an `at` entry missing) is `params_invalid` when the inputs' sizes are known (§10.2 step +6). + +## 5. The chain and its tree + +### 5.1 The chain + +A session's steps are numbered from 0 by `seq`, and each names the link hash of the one before +it in `prev`: a hash chain, so no step can be removed, inserted or reordered without breaking +every link after it. A step whose `seq` is not below the record's `steps` (§6), a `seq` given +twice, a step 0 whose `prev` is not `null`, a later step whose `prev` is `null`, or a `prev` +that is not the link hash of step `seq` − 1 where the verifier holds that step, is +`chain_broken`. + +### 5.2 The tree + +The steps are the leaves of a binary Merkle tree, built as jwp-receipts §2.2 builds a group's, +over the steps' link hashes in `seq` order, with domains of this extension's own so that the +root of a session's steps can never be read as a group's: + +``` +leaf(step) = BLAKE3("wai:contribution-leaf\x01" || link_hash(step)) +node(left, right) = BLAKE3("wai:contribution-node\x01" || left || right) +``` + +At each level with an odd number of nodes the last is duplicated; the root is the single node +left. The record states the number of leaves, `steps`, so the duplicated node can stand for no +other step. + +A disclosed step carries an **inclusion proof**: its siblings from the leaf level upward, +exactly ⌈log₂ `steps`⌉ of them (none for one step). It is walked as jwp-receipts §3 step 5 +walks an object's proof, with the leaf index the step's `seq` and the direction bits the bits of +`seq`: at level *i*, bit *i* of `seq` set means the current node is the right child. A proof of +another length, or one that does not reach the record's `root`, is `inclusion_failed`. + +## 6. The contribution record + +The tool signs the **contribution** record, `kind` `"wai-contribution"`: + +| member | type | meaning | +|---|---|---| +| `kind` | string | `"wai-contribution"` | +| `session` | 32 B hex | the link hash of the session record | +| `steps` | integer | the number of steps, at least 1 | +| `root` | 32 B hex | the root of the steps' tree (§5.2) | +| `output` | object | the final output: `{"step", "samples", "width", "height", "content_hash"}`, the `seq` of the step that produced it (below `steps`), its samples digest and size, and the content hash (jwp-receipts §2.1) of the object it was published as, or `null` | +| `map` | 32 B hex | the digest of the authorship map (§7.3) | +| `origin` | 32 B hex or `null` | the link hash of the output's origin claim (synthesis §3.1); `null` only with `content_hash` `null` too, or where the tool signs none | +| `estimates` | array | 0 to 16 estimated shares (below) | +| `issued_at` | date-time | when the tool signed it | +| `signer_pubkey`, `sig` | | §2: the tool's key | + +A record that is not the session's is `session_mismatch`; one not signed by the tool's key, +`signer_mismatch`; one whose `origin` is not `null` while `content_hash` is, `record_malformed`. + +An **estimate** is `{"estimator", "class", "party", "basis", "share_ppm"}`: a term naming the +method, a term naming its class (the family of methods it belongs to, such as an +information-theoretic one), a party (`party_unknown` otherwise), `made_by` or `directed_by`, and +the share it estimates in parts per million, at most 1 000 000. An estimate is the tool's +statement with its class, as an energy figure carries its class: a verifier reports it as +stated, beside the counts of §7.4 and never in place of them, and never adds it to them. + +## 7. The authorship map + +### 7.1 Labels + +Every sample of the output has a **label**: two sets, `made_by`, the parties whose act produced +the sample's value, and `directed_by`, the parties whose choices conditioned it (a prompt, a +mask, a selection, a transform's parameters, an arrangement). A set holds parties, and may hold +one of two markers: + +- `unknown`: no pinned rule fixes where the sample's value came from, even with every step + disclosed: an `attest` transform or composition does not pin its sample mapping; +- `undisclosed` (in a verifier's computed map only, never in a stated one): the sample comes + from a state whose step the verifier does not hold. + +A marker is never a party and is never counted as one: **unknown is never zero**. A sample a +rule cannot attribute is reported as such, not credited to anyone. + +### 7.2 Dependency rules + +The map of a state is computed from its step and its inputs' maps. The map of an input whose +step the verifier does not hold has every sample `({undisclosed}, {undisclosed})`. For a step +performed by party *a*: + +| act | label of each sample of the output | +|---|---| +| `author` | `({a}, {})` | +| `generate`; each member of `candidates` | `({a}, P)`, *P* the set of `prompt_by`, where it is not `null` | +| `edit` | inside the region `({a}, {})`; outside it, the input's label at the same pixel | +| `inpaint` | inside the region `({a}, P ∪ {mask_by})`; outside it, the input's label at the same pixel | +| `select` | the input's label at the same pixel, with *a* added to `directed_by` | +| `transform`, `replicate` | the union, over the input pixels its sample mapping reads (§4.5), of their `made_by`, and of their `directed_by` with *a* added | +| `compose`, `replicate` | at a pixel an input covers, that input pixel's label with *a* added to `directed_by`; at a canvas pixel no input covers, `({a}, {a})`: the fill is the arranger's | +| `transform` or `compose`, `attest` | `({unknown}, {unknown})` | +| `reject` | no output | + +So a geometric transform carries each label through its exact sample mapping; a filter that +mixes pixels takes the union of what it mixes; a value transform keeps `made_by` and adds its +chooser to `directed_by`; a selection keeps the chosen candidate's map and adds the selector +everywhere; a composition takes each layer's map where the layer is visible. A model's samples, +generated or inpainted, are `made_by` that model whether or not its generator is pinned: the act +places them, and the step's status (§10.3) says whether they were regenerated. An `edit`'s or an +`inpaint`'s region takes nothing from the samples it replaced: they no longer condition it. + +Where the verifier does not know an input's size (its step is not held), the sample mapping +cannot be followed; a `transform` or `compose` then gives every output sample `({undisclosed}, +{undisclosed, a})`, and a `select` gives the input's label as above. The output's map is the map +of the state the record's `output` names: the one its `step` produced. + +### 7.3 Encoding + +The map is a JSON object under §2's encodings, `kind` `"wai-authorship-map"`, unsigned and +bound by its digest: + +| member | type | meaning | +|---|---|---| +| `kind` | string | `"wai-authorship-map"` | +| `output` | 32 B hex | the samples digest of the output | +| `width`, `height` | integer | the output's size | +| `palette` | array | the distinct labels, each `{"made_by", "directed_by"}`, in the order each first occurs in row-major order | +| `rows` | array | `height` rows, each an array of runs `[i, n]`: `n` ≥ 1 pixels with palette label `i`, left to right, summing to `width`; adjacent runs never share a label | + +A set is an array of party positions in ascending order, then `"unknown"` where it holds that +marker; a stated map holds no `"undisclosed"`. Every party is a party of the session. A map +that breaks any of these rules is `map_malformed`: each map has one encoding. + +``` +map digest = BLAKE3("wai:contribution-map\x01" || JCS(map)) +``` + +The record names the map by its digest, and the map names the output's samples digest and +size, so the map is bound to the samples it describes. A map whose digest is not the record's +`map`, or whose `output`, `width` or `height` is not the record's output's, is `map_unbound`. + +### 7.4 Shares + +The **shares** of a map are exact sample counts: the number of samples; for each party, the +number of samples whose `made_by` holds it, and separately the number whose `directed_by` holds +it; and, for each of the two sets, the number of samples holding `unknown` and the number holding +`undisclosed`. A sample counts once for each party its set holds, so a sample two parties made +counts for both. The counts are never combined into one figure: what `made_by` and +`directed_by` mean is a reader's to weigh under its own rule. + +## 8. Disclosure + +### 8.1 Salted commitments + +A prompt, and any other text a party gives a step, is carried as a salted commitment: + +``` +commitment = SHA-256(salt || UTF-8(text)) +``` + +with `salt` 32 fresh random bytes for each commitment. A short or guessable prompt cannot be +recovered by hashing candidates: the salt is not disclosed with the step. An **opening** +`{"commitment", "salt", "text"}` discloses one: the salt (32 bytes) and the text (a string). +An opening whose salt and text do not hash to its commitment is `opening_mismatch`. + +### 8.2 What each disclosure gives + +A creator discloses some or all of the steps, each with its inclusion proof, and some or all of +the states, the openings of the prompts and the model files a pinned generator reads. The tier +of the outcome (§10.3) follows from what is disclosed: + +| disclosed | tier | +|---|---| +| every step behind the output, every state they read and write, the openings of their prompts and the model files of their pinned generators, no `attest` step behind the output | `recomputed` | +| as above with an `attest` step behind the output, or with a state, an opening or a model file withheld | `checked`: what was held was checked, the rest is committed | +| some steps, with their proofs: the others committed by the root | `checked`, and the samples from undisclosed steps `undisclosed` | +| the record and the map, no step | `stated`: the signed map is held, nothing recomputed | + +A withheld prompt stays private: its commitment binds the step to it, and the step's map does +not depend on its text. A withheld step stays private too: its leaf is in the root, so it cannot +be replaced later, and the samples it produced are `undisclosed`, never credited to anyone. + +## 9. Agreement and mappings + +### 9.1 The origin claim + +Where the record names an origin claim (synthesis §3.1) the verifier holds, read by synthesis +§2 and §3.1: + +- its subject is the object `output.content_hash` (`origin_mismatch`); +- where any sample of the map is `made_by` a model party, its `class` is `synthesized` + (`origin_understated`): an object any part of which a model generated or inpainted is not + captured, reconstructed or assistive, as synthesis §3.2's lattice has it. + +### 9.2 The C2PA actions + +Where every step is disclosed, the record gives one C2PA statement, `{"actions": A}`, written +in JCS: `A` is the actions of the output's manifest (C2PA 2.4 §18.15.1), one per step behind the +output, in `seq` order, after a first `c2pa.created` action: + +- first: `{"action": "c2pa.created", "digitalSourceType": + "http://c2pa.org/digitalsourcetype/empty", "softwareAgent": {"name": T}}`, `T` the session's + `tool`: a session is begun on an empty canvas in a tool, and C2PA 2.4 §18.15.2 asks for + `c2pa.created` first with that source type; +- then, for each step, the action below with `"softwareAgent": {"name": N}`, `N` the tool for a + keyed performer and `tag:transaction.science,2026:wai/model/` followed by the digest in + lowercase hexadecimal for a model (synthesis §6's model identifier), a generator-info map + (C2PA 2.4 §10.2.3.2) with its `name`: + +| step | action | `digitalSourceType` (the IPTC term of) | `changes` | +|---|---|---|---| +| `author` | `c2pa.edited` | its `source` | none | +| `generate`, `candidates` | `c2pa.edited` | `trainedAlgorithmicMedia` for a trained model, `algorithmicMedia` otherwise | none | +| `inpaint` | `c2pa.edited` | `compositeWithTrainedAlgorithmicMedia` for a trained model, `algorithmicMedia` otherwise | the region | +| `edit` | `c2pa.drawing` | `digitalCreation` | the region | +| `transform`: crop | `c2pa.cropped` | none | none | +| `transform`: rotation, mirror | `c2pa.orientation` | none | none | +| `transform`: upscale2 | `c2pa.resized` | `algorithmicallyEnhanced` | none | +| `transform`: denoise3 | `c2pa.enhanced` | `algorithmicallyEnhanced` | none | +| `transform`: lut | `c2pa.adjustedColor` | none | none | +| `transform`: `wai.derive.scaling` | `c2pa.resized` | none | none | +| another `transform`, a `compose` | `c2pa.edited` | none | none | +| `select` | none: it changes no sample | | | + +An action's members are written in the order JCS gives them. `changes` (C2PA 2.4 §18.15.4.6) is +one region map (§18.2): `[{"region": R}]`, `R` one spatial range for each rectangle, in the +step's order, `{"type": "spatial", "shape": {"type": "rectangle", "unit": "pixel", "origin": +{"x": X, "y": Y}, "width": W, "height": H}}`, the coordinates as integers (a manifest in CBOR +writes them as the floats §18.2.3 types them). The IPTC term is +`http://cv.iptc.org/newscodes/digitalsourcetype/` followed by the code. The trained models' +`c2pa.ai-disclosure` assertions are the origin claim's (synthesis §6). A rejected state, and a +branch of the session the output does not come from, give no action: they did not make the +asset. Embedding the statement in a manifest, and signing it, is C2PA's. + +### 9.3 Identity assertions (informative) + +A keyed party may give the output's manifest an identity assertion (Identity Assertion 1.2 +§5.1, label `cawg.identity`) whose referenced assertions include the actions assertion of §9.2, +as §6.1 there recommends for an actor who performed those actions, under a credential of §8 +there. The roles of §5.1.2 there (`cawg.creator`, `cawg.contributor`, `cawg.editor`, …) are the +party's own statement of its relationship to the asset; this extension does not derive one +from the shares. The party's key in the session is an Ed25519 key, not a credential type of §8 +there, and the relation between the two is the party's to state. + +### 9.4 Live tracks (informative) + +A record covers one still. Over [live-provenance](live-provenance.md), a still a room carries, +or a frame of a track whose segment manifests are written under that extension, is tied to its +record by naming the record's link hash in an entity-specific assertion beside §5 there's, and +the record, its session, its memberships, its disclosed steps and its map are offered by the +carriage that offers the track's receipts, as deriving-edge §6 offers a chain's records. Per-frame +maps of a track are a later revision's. + +## 10. Verification + +### 10.1 Inputs + +A verifier is given: the session record; its memberships, in a list; the contribution record; +the disclosed steps, in a list, each with its inclusion proof; the authorship map; the openings +it holds, in a list; the states it holds, each a buffer, named by its samples digest; the model +files it holds, each named by its SHA-256; the origin claims it holds, in a list; and a +**policy** of one member: + +| member | values | default | meaning | +|---|---|---|---| +| `tier` | `stated`, `checked`, `recomputed` | `stated` | the lowest tier it accepts (`tier_not_met`) | + +### 10.2 Steps of verification + +The verifier runs these steps and stops at the first refusal, which it reports with its reason +and its place: `["session"]`, `["session", "party", i]`, `["membership", i]`, `["record"]`, +`["step", i]`, `["map"]`, `["map", x, y]`, `["opening", i]`, `["origin", i]` or `["policy"]`, +each *i* a position in its list (a party's among the parties) and (*x*, *y*) a pixel. + +1. **Reading** (§2, §3, §4.1–§4.3, §6, §7.3, §8.1): the session, the memberships, the record, + the steps, the map and the openings, each in order, read and their signatures verify; the + origin claims read and verify by synthesis §2 and §3.1. `record_malformed`, `bad_key`, + `bad_signature`, `act_reserved`, `map_malformed`. A step whose `act` is `direct` is + `act_reserved` once its members are read, whatever they hold. A proof that is not an array + of 32-byte strings is `record_malformed`. +2. **Openings** (§8.1): `opening_mismatch`. +3. **Membership** (§3.2): each membership in order (`membership_invalid`), then each keyed + party in order (`party_not_countersigned`). +4. **The record** (§6): `session_mismatch`, `signer_mismatch`, and each estimate's party + (`party_unknown`). +5. **Each step**, in the order given: `session_mismatch`, `party_unknown`, + `party_role_mismatch`, `signer_mismatch` (§4.1); `check_mismatch` and `params_invalid` + (§4.4); `chain_broken` (§5.1); `inclusion_failed` (§5.2). +6. **Each step against the states**, in `seq` order, each by these checks in order: + 1. each state its output names that the verifier holds is `width` · `height` · 3 bytes + (`samples_mismatch`); + 2. each input whose step the verifier holds is that step's output, or a member of its set + (`input_unknown`); for a `select`, instead: its output is its input, and where the + verifier holds the input's step, that step is a `candidates` step and the input is a + member of its set (`selection_not_in_set`); + 3. for an `edit` or an `inpaint` whose input's step is held, that step's output has this + step's output's size (`region_invalid`); + 4. for a `replicate` `transform` or `compose` whose inputs' sizes are known, its parameters + hold over them (§4.5, `params_invalid`); + 5. the act's own check, where the verifier holds what it reads: + - `edit`, `inpaint`: the input's and the output's samples held, every pixel outside the + region is the input's, byte for byte (`outside_region_changed`); + - `generate`, `candidates`, `inpaint`, `replicate`: the model file and the prompt's + opening (where `prompt` is not `null`) held, each state regenerates (§4.5), the inpainted + region pixel for pixel (`regeneration_mismatch`); + - `transform`, `compose`, `replicate`: every input's and the output's samples held, the + operation evaluated over the inputs gives the output's size and samples + (`recompute_mismatch`). +7. **The output** (§6): where the verifier holds the step `output.step`, that step's output is + one state with the record's samples digest and size (`output_mismatch`); a held buffer of the + output's digest is `width` · `height` · 3 bytes (`samples_mismatch`). +8. **The map** (§7): the map is bound (`map_unbound`). The verifier computes the output's map by + §7.2 from the steps it holds and compares it with the stated map, pixel by pixel in row-major + order, `made_by` then `directed_by`. Where the computed set holds `undisclosed`, the parties + and the `unknown` it holds besides are in the stated set; otherwise the two sets are equal. + At the first pixel where that fails: `unknown_attributed` where the computed set holds + `unknown` and the stated set does not (a sample no pinned rule fixes, credited to a party); + otherwise `map_mismatch`. +9. **The origin claim** (§9.1): `origin_mismatch`, `origin_understated`, at the claim's place. +10. **Policy**: an outcome below the policy's `tier` is `tier_not_met`. + +### 10.3 Statuses and tiers + +Each step the verifier holds has a **status**: + +- `attested`: its `check` is `attest`; +- `checked`: its `check` is `replicate`, the verifier holds the step of each of its inputs, and + each check of step 6.5 its act has ran (an `author` and a `reject` have none, a `select`'s is + step 6.2's against the held `candidates` step); +- `not-checked`: otherwise. + +The steps **behind the output** are the step `output.step` and, recursively, the step of each +input of a step behind the output. The outcome's **tier**: + +- `recomputed`: every step behind the output is held, and `checked`; +- `stated`: the verifier holds no step; +- `checked`: otherwise. + +### 10.4 What an accepted case states + +- `tier` (§10.3); +- `session` and `record`: the link hashes of the session record and the contribution record; +- `steps`: each held step in `seq` order, its `seq`, `act`, `party`, `check` and `status`; +- `committed`: the number of steps not held; +- `computed` and `stated`: the shares (§7.4) of the computed map and of the stated map, each + `samples`; `made_by` and `directed_by`, each a list of `{"party", "samples"}` for the parties + with a count above zero, in ascending order of party; and `made_by_unknown`, + `made_by_undisclosed`, `directed_by_unknown` and `directed_by_undisclosed`; +- `estimates`: the record's, as stated; +- `origin`: `agree` where the claim the record names was held and checked, `not-checked` where + it was not held, `null` where the record names none; +- `c2pa`: the statement of §9.2 as its JCS text, where every step is held; otherwise `null`. + +## 11. Reasons + +The codes this extension adds, each with where it is raised: + +| reason | raised at | +|---|---| +| `record_malformed` | §2, §3.1, §4.1, §4.2, §4.3, §6, §8.1, §10.2 step 1 | +| `bad_key` | §2 | +| `bad_signature` | §2 | +| `act_reserved` | §4.2 | +| `map_malformed` | §7.3 | +| `opening_mismatch` | §8.1 | +| `membership_invalid` | §3.2 | +| `party_not_countersigned` | §3.2 | +| `session_mismatch` | §4.1, §6 | +| `party_unknown` | §4.1, §6 | +| `party_role_mismatch` | §4.1 | +| `signer_mismatch` | §4.1, §6 | +| `check_mismatch` | §4.4 | +| `params_invalid` | §4.4, §4.5, §10.2 step 6 | +| `chain_broken` | §5.1 | +| `inclusion_failed` | §5.2 | +| `samples_mismatch` | §10.2 steps 6 and 7 | +| `input_unknown` | §10.2 step 6 | +| `selection_not_in_set` | §4.2, §10.2 step 6 | +| `region_invalid` | §10.2 step 6 | +| `outside_region_changed` | §10.2 step 6 | +| `regeneration_mismatch` | §4.5, §10.2 step 6 | +| `recompute_mismatch` | §4.5, §10.2 step 6 | +| `output_mismatch` | §10.2 step 7 | +| `map_unbound` | §7.3 | +| `map_mismatch` | §10.2 step 8 | +| `unknown_attributed` | §7.1, §10.2 step 8 | +| `origin_mismatch` | §9.1 | +| `origin_understated` | §9.1 | +| `tier_not_met` | §10.1 | + +## 12. Conformance + +[`live-conformance/contribution/`](../live-conformance/contribution/) holds the corpus, in one +file, `vectors.json`, written from fixed seeds by `wai_contribution_vectors gen`. It holds the +model file of `wai.generate.spectral` its sessions generate with, and the **vectors**: each a +case of §10.1, its outcome and, accepted, everything §10.4 states; refused, its reason and its +place. The exact generator of the corpus is `wai.generate.spectral`, with the model file of its +conformance vector (`wai-rs/tests/vectors/generate/generate_spectral_model.json`). It has: + +- **Accepted, `recomputed`**: a person's drawing, a collaborator's brush edit inside a region, + and a crop; an inpainting by the pinned generator inside a region one person marked, from a + prompt another wrote, regenerated; three candidates, each regenerated from its seed, one + selected by an audience member, one rejected, then a colour table applied; a generated layer + composed over a drawing and a fill; and a chain of transforms (rotation, mirror, upscale, + denoise, crop), each recomputed, with an origin claim that agrees. +- **Accepted, `checked`**: an inpainting by a trained model the tool attests, its outside + region checked; an attested scaling whose output is `unknown`; the candidates session with its + generating step undisclosed, its samples `undisclosed`; and the same with every step disclosed + but the prompts withheld, so no candidate is regenerated. +- **Accepted, `stated`**: the record and the map, no step; and a record that attaches an + estimate with its class. +- **Refused**: each reason of §11 at least once, each a control of one defect: among them a + sample outside an edit's region changed, a selected output not in its set, a candidate that + does not regenerate, a map that does not recompute, a gap in the chain, a step by a party the + session does not have, a person enrolled without countersigning, an attested region credited + to a person instead of `unknown`, an origin claim of a lower class than the map implies, and a + prompt commitment that does not open. + +A conforming verifier gives every vector the outcome, the reason, the place and the statements +the corpus states. `wai_contribution_vectors verify` and the test `tests/contribution.rs` check +that the file regenerates byte for byte, that `wai-rs` gives every vector its outcome, and that +§11 lists exactly the reference's codes. `live-conformance/contribution_verify.py` is the second +implementation, written from this text: it shares no code with `wai-rs`; it computes every map +itself, evaluates every pinned operation and runs the generator in its own arithmetic, checking +that arithmetic first against the generator's conformance vector +(`wai-rs/tests/vectors/generate/sha256.json`); it reads origin claims with the synthesis +corpus's second implementation (`synthesis_verify.py`), verifies every signature with WAI's +strict rule (`claim-conformance/_ed25519.py`) and every link hash with BLAKE3 written from its +specification (`claim-conformance/_blake3.py`); and it mutates copies of the corpus and requires +every copy to fail. + +## 13. Security and privacy considerations + +- **What is checked and what is stated.** A step is signed by the party that performed it, or by + the tool for a model. The samples a person introduces are that person's statement: WAI checks + everything that happened to them afterwards, not whether the person made them without a model. + An `author` step's `source` says what the person made, as a capture's claim does. A model's + samples from an `attest` generator are the tool's statement; from a pinned generator they are + regenerated, so the step proves exactly what was generated, and that no person painted it. +- **The region.** An edit or an inpainting is checked, not claimed, to have changed nothing + outside its region: a verifier holding the two states compares every pixel. What a model's + fill read from outside the region conditions it, and is not attributed in this revision. +- **Taste as evidence.** A `candidates` step commits every candidate by digest and seed, and a + `reject` keeps what was discarded committed, so a verifier that regenerates the set sees what + was chosen over what. +- **Withholding.** A creator who discloses part of a session cannot change the rest later: the + record's root commits to every step. A withheld step's samples are `undisclosed` and a + withheld prompt is a salted commitment; neither is ever credited to a party. A creator who + withholds can only lower the tier the outcome reaches. +- **Enrolment.** A person is a party only by countersigning the session, so a tool cannot credit + a person, or blame one, without that person's signature over the whole list of parties. A + model party signs nothing; its acts are the tool's statements about it. +- **Not a judgment.** A record states facts sample by sample; it ranks no contribution, and its + counts are exact where a rule fixes them and marked where none does. An estimate is the tool's, + with its class, and is never mixed into the counts. What any of it means for authorship is + decided elsewhere, by others, under their own rules. +- **Privacy of process.** Prompts are committed with a salt; a session names parties by keys and + digests, never by name; the states are digests unless disclosed. A disclosed state is a + picture, and a creator discloses what it chooses. diff --git a/wai/live-conformance/contribution/vectors.json b/wai/live-conformance/contribution/vectors.json new file mode 100644 index 000000000..14a48c08c --- /dev/null +++ b/wai/live-conformance/contribution/vectors.json @@ -0,0 +1,2919 @@ +{ + "about": "the conformance corpus of extensions/contribution.md §12, written by wai_contribution_vectors gen", + "models": [ + { + "sha256": "963ee634db1a964d14004618b139fd7e32598f627c023faf9526b14611504f9e", + "file": 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+ "proof": [ + "7a3bae482938ec69e7e298613f59351d3f7d7621a1eedefcc89872d3762df903", + "4852389a733b52d6c0be74c466c1e5d4c9f378eecfe8712bf287320954609582" + ] + } + ], + "map": "{\"height\":6,\"kind\":\"wai-authorship-map\",\"output\":\"cbb50f401f7143171133c6dc51bd20697f25e6645ddd9e83f1792de79f1e2176\",\"palette\":[{\"directed_by\":[0,4],\"made_by\":[2]}],\"rows\":[[[0,8]],[[0,8]],[[0,8]],[[0,8]],[[0,8]],[[0,8]]],\"width\":8}", + "openings": [ + "{\"commitment\":\"426086c64da7c1c19c02055132da0ae84a7b3a45b804db95bbe263f5734b3413\",\"salt\":\"a3b062613d3ff73f4d8607aa9b8bedc0a589a6b50ac9d93829f2d59752ea427c\",\"text\":\"a bright spiral of fire\"}" + ], + "states": [], + "models": [ + "963ee634db1a964d14004618b139fd7e32598f627c023faf9526b14611504f9e" + ], + "origins": [], + "outcome": "refuse", + "reason": "tier_not_met", + "at": [ + "policy" + ] + } + ] +} diff --git a/wai/wai-rs/Cargo.toml b/wai/wai-rs/Cargo.toml index 1aef829b2..a347eea9e 100644 --- a/wai/wai-rs/Cargo.toml +++ b/wai/wai-rs/Cargo.toml @@ -298,6 +298,15 @@ derive_edge = ["key_discovery", "video_int", "png_still", "dep:jpeg-encoder"] # the review's tier, and the label obligations of a player's signed log. SHA-256, BLAKE3, # Ed25519 and the key log only; no new dependency. synthesis = ["live_room"] +# Contribution records (extensions/contribution): `wai.media.contribution` — a tool's session of +# parties (people by key, each countersigning its membership; models by digest), the signed hash +# chain of steps (author, generate, candidates, select, edit, inpaint, transform, compose, reject) +# in a Merkle tree for selective disclosure, the authorship map computed by re-executing each +# act's dependency rule (made_by and directed_by per sample, unknown and undisclosed never +# credited), the checks a verifier makes (regions, selections, regeneration, recomputation), and +# the agreement with the output's origin claim. Reuses synthesis (its records and derivations) +# and generate (the pinned generator its exact steps regenerate with); no new dependency. +contribution = ["synthesis", "generate"] # AI usage preferences and consumption claims (extensions/ai-usage): `wai.ai.usage` — the usage # statement (draft-ietf-aipref-vocab-08's Structured Field form, the TDM Reservation Protocol's # properties and the Training and Data Mining Assertion's entries, verbatim) in an envelope's @@ -765,6 +774,11 @@ name = "wai_synthesis_vectors" path = "src/bin/wai_synthesis_vectors.rs" required-features = ["synthesis"] +[[bin]] +name = "wai_contribution_vectors" +path = "src/bin/wai_contribution_vectors.rs" +required-features = ["contribution"] + [[bin]] name = "wai_live_watermark_vectors" path = "src/bin/wai_live_watermark_vectors.rs" @@ -1493,6 +1507,11 @@ name = "synthesis" path = "tests/synthesis.rs" required-features = ["synthesis"] +[[test]] +name = "contribution" +path = "tests/contribution.rs" +required-features = ["contribution"] + [[test]] name = "live_watermark" path = "tests/live_watermark.rs" diff --git a/wai/wai-rs/src/bin/wai_contribution_vectors.rs b/wai/wai-rs/src/bin/wai_contribution_vectors.rs new file mode 100644 index 000000000..6f8163e01 --- /dev/null +++ b/wai/wai-rs/src/bin/wai_contribution_vectors.rs @@ -0,0 +1,74 @@ +//! Conformance corpus for contribution records (`live-conformance/contribution/`, extensions/contribution.md §12). +//! +//! wai_contribution_vectors gen write vectors.json from fixed seeds +//! wai_contribution_vectors verify every file regenerates byte for byte, no other +//! file but README.md is there, and every case +//! gets the outcome it states +//! +//! The generator and this verifier are one implementation. The corpus's second +//! implementation is `live-conformance/contribution_verify.py`, written from the extension's +//! text and sharing no code with this binary. + +use std::collections::BTreeMap; +use std::path::Path; +use wai::contribution::corpus; + +fn main() { + let a: Vec = std::env::args().collect(); + match (a.get(1).map(String::as_str), a.get(2)) { + (Some("gen"), Some(d)) => { + if let Err(e) = std::fs::create_dir_all(d) { + eprintln!("create {d}: {e}"); + std::process::exit(1); + } + for (name, body) in corpus::generate() { + let p = Path::new(d).join(&name); + if let Err(e) = std::fs::write(&p, body) { + eprintln!("write {}: {e}", p.display()); + std::process::exit(1); + } + } + println!("wrote {d}"); + } + (Some("verify"), Some(d)) => std::process::exit(verify(Path::new(d))), + _ => { + eprintln!("usage: wai_contribution_vectors gen|verify "); + std::process::exit(2); + } + } +} + +fn verify(dir: &Path) -> i32 { + let mut files = BTreeMap::new(); + let entries = match std::fs::read_dir(dir) { + Ok(e) => e, + Err(e) => { + eprintln!("read {}: {e}", dir.display()); + return 1; + } + }; + for e in entries.flatten() { + let name = e.file_name().to_string_lossy().into_owned(); + if name == "README.md" { + continue; + } + match std::fs::read_to_string(e.path()) { + Ok(s) => { + files.insert(name, s); + } + Err(err) => { + eprintln!("read {name}: {err}"); + return 1; + } + } + } + let generated: BTreeMap = corpus::generate().into_iter().collect(); + let same = files == generated; + println!("{} every file regenerates byte for byte from its seeds, and no other file is there", if same { "PASS" } else { "FAIL" }); + let fails = corpus::verify(&files); + for f in &fails { + println!("FAIL {f}"); + } + println!("{} every case gets the outcome the corpus states", if fails.is_empty() { "PASS" } else { "FAIL" }); + (!same || !fails.is_empty()) as i32 +} diff --git a/wai/wai-rs/src/contribution.rs b/wai/wai-rs/src/contribution.rs new file mode 100644 index 000000000..bd1cc0c04 --- /dev/null +++ b/wai/wai-rs/src/contribution.rs @@ -0,0 +1,2002 @@ +//! Contribution records (`extensions/contribution.md`): the record `wai.media.contribution`. +//! +//! A tool signs a **session** naming its parties (people by key, each countersigning its own +//! membership; models by digest), and every act in it is a signed **step** in a hash chain: +//! `author`, `generate`, `candidates`, `select`, `edit`, `inpaint`, `transform`, `compose` and +//! `reject` (§4). Each act has a dependency rule, and re-executing the steps gives every sample +//! of the output two sets of parties: `made_by`, whose act produced its value, and +//! `directed_by`, whose choices conditioned it. That **authorship map** is computed, not +//! declared (§7). A verifier checks that an edit or an inpainting changed nothing outside its +//! region, that a selection is a member of its set and that every candidate regenerates, that a +//! transform recomputes, that the map recomputes, and that the output's origin claim +//! (`extensions/synthesis.md`) is at least what the map implies (§9.1). The steps are the leaves +//! of a Merkle tree, so a creator can disclose some of them; prompts are salted commitments; +//! and the outcome's tier says what the disclosure reached: `recomputed`, `checked` or `stated` +//! (§10.3). A sample no disclosed, pinned rule fixes is `unknown` or `undisclosed`, never +//! credited to anyone. +//! +//! The corpus is `live-conformance/contribution/` ([`corpus`]); its second implementation is +//! `live-conformance/contribution_verify.py`. + +use std::collections::{BTreeMap, BTreeSet}; + +use ed25519_dalek::{Signer, SigningKey}; +use serde_json::{json, Map, Value}; +use sha2::{Digest, Sha256}; + +use crate::claim_receipt::{rfc3339, term_ok}; +use crate::jcs::{jcs, MAX_INTEGER}; +use crate::synthesis::{self as syn, Class}; + +pub mod corpus; + +/// The domain every signed record of this extension is signed under (§2). +pub const SIGN_DOMAIN: &[u8] = b"wai:contribution\x01"; +/// The domain of a record's link hash (§2). +pub const LINK_DOMAIN: &[u8] = b"wai:contribution-link\x01"; +/// The domains of the steps' tree (§5.2). +pub const LEAF_DOMAIN: &[u8] = b"wai:contribution-leaf\x01"; +pub const NODE_DOMAIN: &[u8] = b"wai:contribution-node\x01"; +/// The domain of the authorship map's digest (§7.3). +pub const MAP_DOMAIN: &[u8] = b"wai:contribution-map\x01"; +/// The pinned generator (§4.5). +pub const SPECTRAL: &str = "wai.generate.spectral"; +/// The per-sample colour table this extension pins (§4.5). +pub const LUT: &str = "wai-contribution:lut"; +pub const CROP: &str = "wai.derive.crop"; +pub const ROTATION: &str = "wai.derive.rotation"; +pub const MIRROR: &str = "wai.derive.mirror"; +pub const SCALING: &str = "wai.derive.scaling"; +pub const OVERLAY: &str = "wai.derive.overlay_composition"; +pub const GRID: &str = "wai.derive.grid_composition"; +/// C2PA 2.4 §18.15.2's source type of an asset created with no content. +pub const EMPTY: &str = "http://c2pa.org/digitalsourcetype/empty"; +/// The most bytes a state holds (§2). +pub const MAX_SAMPLES: u64 = 1 << 26; +/// The most parties a session names (§3.1). +pub const MAX_PARTIES: usize = 64; + +/// Why a case is refused (§11). +#[derive(Clone, Copy, Debug, PartialEq, Eq, Hash, PartialOrd, Ord)] +pub enum Reason { + RecordMalformed, + BadKey, + BadSignature, + ActReserved, + MapMalformed, + OpeningMismatch, + MembershipInvalid, + PartyNotCountersigned, + SessionMismatch, + PartyUnknown, + PartyRoleMismatch, + SignerMismatch, + CheckMismatch, + ParamsInvalid, + ChainBroken, + InclusionFailed, + SamplesMismatch, + InputUnknown, + SelectionNotInSet, + RegionInvalid, + OutsideRegionChanged, + RegenerationMismatch, + RecomputeMismatch, + OutputMismatch, + MapUnbound, + MapMismatch, + UnknownAttributed, + OriginMismatch, + OriginUnderstated, + TierNotMet, +} + +impl Reason { + /// The codes, in §11's order. + pub const ALL: [Reason; 30] = [ + Reason::RecordMalformed, + Reason::BadKey, + Reason::BadSignature, + Reason::ActReserved, + Reason::MapMalformed, + Reason::OpeningMismatch, + Reason::MembershipInvalid, + Reason::PartyNotCountersigned, + Reason::SessionMismatch, + Reason::PartyUnknown, + Reason::PartyRoleMismatch, + Reason::SignerMismatch, + Reason::CheckMismatch, + Reason::ParamsInvalid, + Reason::ChainBroken, + Reason::InclusionFailed, + Reason::SamplesMismatch, + Reason::InputUnknown, + Reason::SelectionNotInSet, + Reason::RegionInvalid, + Reason::OutsideRegionChanged, + Reason::RegenerationMismatch, + Reason::RecomputeMismatch, + Reason::OutputMismatch, + Reason::MapUnbound, + Reason::MapMismatch, + Reason::UnknownAttributed, + Reason::OriginMismatch, + Reason::OriginUnderstated, + Reason::TierNotMet, + ]; + + /// The conformance code. + pub fn code(self) -> &'static str { + match self { + Reason::RecordMalformed => "record_malformed", + Reason::BadKey => "bad_key", + Reason::BadSignature => "bad_signature", + Reason::ActReserved => "act_reserved", + Reason::MapMalformed => "map_malformed", + Reason::OpeningMismatch => "opening_mismatch", + Reason::MembershipInvalid => "membership_invalid", + Reason::PartyNotCountersigned => "party_not_countersigned", + Reason::SessionMismatch => "session_mismatch", + Reason::PartyUnknown => "party_unknown", + Reason::PartyRoleMismatch => "party_role_mismatch", + Reason::SignerMismatch => "signer_mismatch", + Reason::CheckMismatch => "check_mismatch", + Reason::ParamsInvalid => "params_invalid", + Reason::ChainBroken => "chain_broken", + Reason::InclusionFailed => "inclusion_failed", + Reason::SamplesMismatch => "samples_mismatch", + Reason::InputUnknown => "input_unknown", + Reason::SelectionNotInSet => "selection_not_in_set", + Reason::RegionInvalid => "region_invalid", + Reason::OutsideRegionChanged => "outside_region_changed", + Reason::RegenerationMismatch => "regeneration_mismatch", + Reason::RecomputeMismatch => "recompute_mismatch", + Reason::OutputMismatch => "output_mismatch", + Reason::MapUnbound => "map_unbound", + Reason::MapMismatch => "map_mismatch", + Reason::UnknownAttributed => "unknown_attributed", + Reason::OriginMismatch => "origin_mismatch", + Reason::OriginUnderstated => "origin_understated", + Reason::TierNotMet => "tier_not_met", + } + } +} + +impl std::fmt::Display for Reason { + fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result { + f.write_str(self.code()) + } +} + +impl std::error::Error for Reason {} + +// --------------------------------------------------------------------------------------- +// §2 Records: encodings, signature, identity +// --------------------------------------------------------------------------------------- + +pub fn sha256(parts: &[&[u8]]) -> [u8; 32] { + let mut h = Sha256::new(); + for p in parts { + h.update(p); + } + h.finalize().into() +} + +fn blake3(parts: &[&[u8]]) -> [u8; 32] { + let mut h = blake3::Hasher::new(); + for p in parts { + h.update(p); + } + *h.finalize().as_bytes() +} + +pub fn hex(b: &[u8]) -> String { + b.iter().map(|x| format!("{x:02x}")).collect() +} + +pub fn unhex(s: &str) -> Option> { + if !s.len().is_multiple_of(2) || !s.bytes().all(|c| c.is_ascii_digit() || (b'a'..=b'f').contains(&c)) { + return None; + } + (0..s.len()).step_by(2).map(|i| u8::from_str_radix(&s[i..i + 2], 16).ok()).collect() +} + +fn hexn(v: &Value) -> Option<[u8; N]> { + unhex(v.as_str()?)?.try_into().ok() +} + +fn int(v: &Value) -> Option { + v.as_u64().filter(|&n| n <= MAX_INTEGER) +} + +fn term(v: &Value) -> Option { + let s = v.as_str()?; + term_ok(s).ok()?; + Some(s.to_string()) +} + +fn one_of(v: &Value, set: &[&str]) -> Option { + let s = v.as_str()?; + set.contains(&s).then(|| s.to_string()) +} + +fn subset_ok(v: &Value) -> bool { + match v { + Value::Null | Value::String(_) => true, + Value::Number(_) => int(v).is_some(), + Value::Bool(_) => false, + Value::Array(a) => a.iter().all(subset_ok), + Value::Object(o) => o.values().all(subset_ok), + } +} + +fn exact<'a>(v: &'a Value, members: &[&str]) -> Option<&'a Map> { + let o = v.as_object()?; + (o.len() == members.len() && members.iter().all(|m| o.contains_key(*m))).then_some(o) +} + +fn nullable(v: &Value, f: impl Fn(&Value) -> Option) -> Option> { + if v.is_null() { Some(None) } else { f(v).map(Some) } +} + +/// The bytes a record is signed over (§2). +pub fn signing_bytes(record: &Value) -> Vec { + let mut r = record.clone(); + if let Some(o) = r.as_object_mut() { + o.remove("sig"); + } + let mut m = SIGN_DOMAIN.to_vec(); + m.extend_from_slice(jcs(&r).expect("a record in the subset").as_bytes()); + m +} + +/// A record's link hash (§2). +pub fn link_hash(record: &Value) -> [u8; 32] { + blake3(&[LINK_DOMAIN, jcs(record).expect("a record in the subset").as_bytes()]) +} + +/// Sign a record body: adds `signer_pubkey` and `sig` (§2). +pub fn sign(mut body: Value, key: &SigningKey) -> Value { + let o = body.as_object_mut().expect("a record is an object"); + o.insert("signer_pubkey".into(), json!(hex(&key.verifying_key().to_bytes()))); + o.remove("sig"); + let sig = key.sign(&signing_bytes(&body)); + body.as_object_mut().expect("an object").insert("sig".into(), json!(hex(&sig.to_bytes()))); + body +} + +/// Read a signed record's members (§2) and return its value and its signer; the signature is +/// checked by [`check_signature`] once the kind's own members have read. +fn read_signed(text: &str, kind: &str, members: &[&str]) -> Result<(Value, [u8; 32]), Reason> { + let v = crate::claim_text::read(text).map_err(|_| Reason::RecordMalformed)?; + let o = exact(&v, members).ok_or(Reason::RecordMalformed)?; + if o.get("kind").and_then(Value::as_str) != Some(kind) || !subset_ok(&v) { + return Err(Reason::RecordMalformed); + } + let signer: [u8; 32] = hexn(&o["signer_pubkey"]).ok_or(Reason::RecordMalformed)?; + if hexn::<64>(&o["sig"]).is_none() || !o["issued_at"].as_str().is_some_and(rfc3339) { + return Err(Reason::RecordMalformed); + } + Ok((v, signer)) +} + +fn check_signature(v: &Value, signer: &[u8; 32]) -> Result<(), Reason> { + let sig: [u8; 64] = hexn(&v["sig"]).ok_or(Reason::RecordMalformed)?; + crate::sig::verify_strict(signer, &signing_bytes(v), &sig).map_err(|e| match e { + crate::sig::SigError::BadKey => Reason::BadKey, + crate::sig::SigError::BadSignature => Reason::BadSignature, + }) +} + +/// A size of a state (§2): each side at least 1, the buffer at most 2^26 bytes. +fn size_ok(w: u64, h: u64) -> bool { + w >= 1 && h >= 1 && w.checked_mul(h).and_then(|n| n.checked_mul(3)).is_some_and(|n| n <= MAX_SAMPLES) +} + +// --------------------------------------------------------------------------------------- +// §3 The session +// --------------------------------------------------------------------------------------- + +#[derive(Clone, Copy, Debug, PartialEq, Eq)] +pub enum Role { + Human, + Audience, + Model, +} + +#[derive(Clone, Debug, PartialEq, Eq)] +pub struct Party { + pub role: Role, + /// A keyed party's key. + pub key: Option<[u8; 32]>, + /// A model's digest, and whether it is trained. + pub digest: Option<[u8; 32]>, + pub trained: bool, +} + +#[derive(Clone, Debug)] +pub struct Session { + pub link: [u8; 32], + pub tool_key: [u8; 32], + pub tool: String, + pub parties: Vec, +} + +pub const SESSION_MEMBERS: [&str; 8] = ["kind", "session", "tool", "media", "parties", "issued_at", "signer_pubkey", "sig"]; +pub const MEMBERSHIP_MEMBERS: [&str; 6] = ["kind", "session", "party", "issued_at", "signer_pubkey", "sig"]; + +fn read_party(v: &Value) -> Option { + match v.get("role")?.as_str()? { + r @ ("human" | "audience") => { + let o = exact(v, &["role", "key"])?; + let role = if r == "human" { Role::Human } else { Role::Audience }; + Some(Party { role, key: Some(hexn(&o["key"])?), digest: None, trained: false }) + } + "model" => { + let o = exact(v, &["role", "digest", "type"])?; + let trained = one_of(&o["type"], &["trained", "algorithmic"])? == "trained"; + Some(Party { role: Role::Model, key: None, digest: Some(hexn(&o["digest"])?), trained }) + } + _ => None, + } +} + +/// Read the session record (§3.1). +pub fn read_session(text: &str) -> Result { + let (v, signer) = read_signed(text, "wai-session", &SESSION_MEMBERS)?; + let f = || { + hexn::<32>(&v["session"])?; + let tool = term(&v["tool"])?; + one_of(&v["media"], &["image"])?; + let parties: Vec = v["parties"].as_array()?.iter().map(read_party).collect::>()?; + let keys: Vec<[u8; 32]> = parties.iter().filter_map(|p| p.key).collect(); + let digests: Vec<[u8; 32]> = parties.iter().filter_map(|p| p.digest).collect(); + let distinct = keys.iter().collect::>().len() == keys.len() && digests.iter().collect::>().len() == digests.len(); + let ok = (1..=MAX_PARTIES).contains(&parties.len()) && distinct && !keys.contains(&signer); + ok.then(|| Session { link: link_hash(&v), tool_key: signer, tool, parties }) + }; + let s = f().ok_or(Reason::RecordMalformed)?; + check_signature(&v, &signer)?; + Ok(s) +} + +#[derive(Clone, Debug)] +pub struct Membership { + pub signer: [u8; 32], + pub session: [u8; 32], + pub party: u64, +} + +/// Read a membership (§3.2). +pub fn read_membership(text: &str) -> Result { + let (v, signer) = read_signed(text, "wai-membership", &MEMBERSHIP_MEMBERS)?; + let f = || Some(Membership { signer, session: hexn(&v["session"])?, party: int(&v["party"])? }); + let m = f().ok_or(Reason::RecordMalformed)?; + check_signature(&v, &signer)?; + Ok(m) +} + +// --------------------------------------------------------------------------------------- +// §4 Steps +// --------------------------------------------------------------------------------------- + +#[derive(Clone, Copy, Debug, PartialEq, Eq)] +pub enum Act { + Author, + Generate, + Candidates, + Select, + Edit, + Inpaint, + Transform, + Compose, + Reject, +} + +impl Act { + pub const ALL: [Act; 9] = [Act::Author, Act::Generate, Act::Candidates, Act::Select, Act::Edit, Act::Inpaint, Act::Transform, Act::Compose, Act::Reject]; + + pub fn name(self) -> &'static str { + match self { + Act::Author => "author", + Act::Generate => "generate", + Act::Candidates => "candidates", + Act::Select => "select", + Act::Edit => "edit", + Act::Inpaint => "inpaint", + Act::Transform => "transform", + Act::Compose => "compose", + Act::Reject => "reject", + } + } + + pub fn from_name(s: &str) -> Option { + Act::ALL.into_iter().find(|a| a.name() == s) + } + + fn generative(self) -> bool { + matches!(self, Act::Generate | Act::Candidates | Act::Inpaint) + } +} + +/// A state a step reads (§4.1). +#[derive(Clone, Copy, Debug, PartialEq, Eq, PartialOrd, Ord)] +pub struct Input { + pub step: u64, + pub samples: [u8; 32], +} + +/// What a step produced (§4.1). +#[derive(Clone, Debug, PartialEq, Eq)] +pub enum Output { + None, + One { samples: [u8; 32], w: u64, h: u64 }, + Set { set: Vec<[u8; 32]>, w: u64, h: u64 }, +} + +impl Output { + pub fn size(&self) -> Option<(u64, u64)> { + match self { + Output::None => None, + Output::One { w, h, .. } | Output::Set { w, h, .. } => Some((*w, *h)), + } + } + + /// Whether this output holds the state of that digest. + pub fn holds(&self, d: &[u8; 32]) -> bool { + match self { + Output::None => false, + Output::One { samples, .. } => samples == d, + Output::Set { set, .. } => set.contains(d), + } + } + + pub fn states(&self) -> Vec<[u8; 32]> { + match self { + Output::None => vec![], + Output::One { samples, .. } => vec![*samples], + Output::Set { set, .. } => set.clone(), + } + } +} + +#[derive(Clone, Copy, Debug, PartialEq, Eq)] +pub struct Rect { + pub x: u64, + pub y: u64, + pub w: u64, + pub h: u64, +} + +impl Rect { + fn contains(&self, x: u64, y: u64) -> bool { + self.x <= x && x < self.x + self.w && self.y <= y && y < self.y + self.h + } +} + +/// A step's parameters (§4.3). +#[derive(Clone, Debug, PartialEq, Eq)] +pub enum Params { + Author { source: String }, + Gen { generator: String, prompt: Option<[u8; 32]>, prompt_by: Option, mask_by: Option, seed: Option, seeds: Option>, steps: Option }, + Empty, + Derive { derivation: String, params: Value }, +} + +#[derive(Clone, Debug)] +pub struct Step { + pub link: [u8; 32], + pub signer: [u8; 32], + pub session: [u8; 32], + pub seq: u64, + pub prev: Option<[u8; 32]>, + pub party: u64, + pub act: Act, + pub inputs: Vec, + pub output: Output, + pub region: Option>, + pub params: Params, + pub replicate: bool, +} + +pub const STEP_MEMBERS: [&str; 14] = + ["kind", "session", "seq", "prev", "party", "act", "inputs", "output", "region", "params", "check", "issued_at", "signer_pubkey", "sig"]; + +fn read_output(v: &Value, act: Act) -> Option { + let size = |o: &Map| { + let (w, h) = (int(&o["width"])?, int(&o["height"])?); + size_ok(w, h).then_some((w, h)) + }; + match act { + Act::Reject => v.is_null().then_some(Output::None), + Act::Candidates => { + let o = exact(v, &["set", "width", "height"])?; + let set: Vec<[u8; 32]> = o["set"].as_array()?.iter().map(hexn).collect::>()?; + let distinct = set.iter().collect::>().len() == set.len(); + let (w, h) = size(o)?; + ((2..=16).contains(&set.len()) && distinct).then_some(Output::Set { set, w, h }) + } + _ => { + let o = exact(v, &["samples", "width", "height"])?; + let (w, h) = size(o)?; + Some(Output::One { samples: hexn(&o["samples"])?, w, h }) + } + } +} + +fn read_params(v: &Value, act: Act, members: usize) -> Option { + let generative = |names: &[&str]| -> Option { + let o = exact(v, names)?; + let prompt = nullable(&o["prompt"], hexn)?; + let prompt_by = nullable(&o["prompt_by"], int)?; + if prompt.is_some() != prompt_by.is_some() { + return None; + } + let seeds = match o.get("seeds") { + Some(s) => { + let s = nullable(s, |a| a.as_array()?.iter().map(int).collect::>>())?; + if s.as_ref().is_some_and(|s| s.len() != members) { + return None; + } + s + } + None => None, + }; + Some(Params::Gen { + generator: term(&o["generator"])?, + prompt, + prompt_by, + mask_by: match o.get("mask_by") { + Some(m) => Some(int(m)?), + None => None, + }, + seed: match o.get("seed") { + Some(s) => nullable(s, int)?, + None => None, + }, + seeds, + steps: nullable(&o["steps"], int)?, + }) + }; + match act { + Act::Author => { + let o = exact(v, &["source"])?; + Some(Params::Author { source: one_of(&o["source"], &syn::CAPTURE_SOURCES)? }) + } + Act::Generate => generative(&["generator", "prompt", "prompt_by", "seed", "steps"]), + Act::Candidates => generative(&["generator", "prompt", "prompt_by", "seeds", "steps"]), + Act::Inpaint => generative(&["generator", "prompt", "prompt_by", "mask_by", "seed", "steps"]), + Act::Select | Act::Edit | Act::Reject => exact(v, &[]).map(|_| Params::Empty), + Act::Transform | Act::Compose => { + let o = exact(v, &["derivation", "params"])?; + o["params"].is_object().then_some(())?; + Some(Params::Derive { derivation: term(&o["derivation"])?, params: o["params"].clone() }) + } + } +} + +fn read_step_fields(v: &Value, act: Act, link: [u8; 32], signer: [u8; 32]) -> Option { + let seq = int(&v["seq"])?; + let mut inputs = Vec::new(); + for i in v["inputs"].as_array()? { + let o = exact(i, &["step", "samples"])?; + let input = Input { step: int(&o["step"])?, samples: hexn(&o["samples"])? }; + if input.step >= seq || inputs.contains(&input) { + return None; + } + inputs.push(input); + } + let output = read_output(&v["output"], act)?; + let n_inputs = match act { + Act::Author | Act::Generate | Act::Candidates => 0..=0, + Act::Compose => 1..=16, + _ => 1..=1, + }; + if !n_inputs.contains(&inputs.len()) { + return None; + } + let region = match act { + Act::Edit | Act::Inpaint => { + let (w, h) = output.size()?; + let rects: Vec = v["region"] + .as_array()? + .iter() + .map(|r| { + let o = exact(r, &["x", "y", "w", "h"])?; + let r = Rect { x: int(&o["x"])?, y: int(&o["y"])?, w: int(&o["w"])?, h: int(&o["h"])? }; + (r.w >= 1 && r.h >= 1 && r.x.checked_add(r.w)? <= w && r.y.checked_add(r.h)? <= h).then_some(r) + }) + .collect::>()?; + if !(1..=256).contains(&rects.len()) { + return None; + } + Some(rects) + } + _ => { + if !v["region"].is_null() { + return None; + } + None + } + }; + let members = match &output { + Output::Set { set, .. } => set.len(), + _ => 0, + }; + let replicate = one_of(&v["check"], &["replicate", "attest"])? == "replicate"; + Some(Step { + link, + signer, + session: hexn(&v["session"])?, + seq, + prev: nullable(&v["prev"], hexn)?, + party: int(&v["party"])?, + act, + inputs, + output, + region, + params: read_params(&v["params"], act, members)?, + replicate, + }) +} + +/// Read a step (§4.1–§4.3). +pub fn read_step(text: &str) -> Result { + let (v, signer) = read_signed(text, "wai-step", &STEP_MEMBERS)?; + let act_name = v["act"].as_str().ok_or(Reason::RecordMalformed)?; + if act_name == "direct" { + return Err(Reason::ActReserved); + } + let act = Act::from_name(act_name).ok_or(Reason::RecordMalformed)?; + let s = read_step_fields(&v, act, link_hash(&v), signer).ok_or(Reason::RecordMalformed)?; + check_signature(&v, &signer)?; + Ok(s) +} + +// --------------------------------------------------------------------------------------- +// §4.5 The pinned operations +// --------------------------------------------------------------------------------------- + +/// A pinned operation of a transform or a composition (§4.5), with its parameters. +#[derive(Clone, Debug, PartialEq, Eq)] +pub enum Op { + Crop { x: u64, y: u64, w: u64, h: u64 }, + Rotation(u64), + Mirror { left_right: bool }, + Upscale2, + Denoise3, + Lut(Vec), + Overlay { width: u64, height: u64, fill: [u8; 3], at: Vec<(u64, u64)> }, + Grid { columns: u64, rows: u64 }, +} + +/// The derivations §4.5 pins for a transform and for a composition. +pub const PINNED_TRANSFORMS: [&str; 6] = [CROP, ROTATION, MIRROR, syn::UPSCALE2, syn::DENOISE3, LUT]; +pub const PINNED_COMPOSITIONS: [&str; 2] = [OVERLAY, GRID]; + +/// Read a pinned derivation's parameters, exactly (§4.5; deriving-edge §4.2). `None` where +/// they are not that derivation's (`params_invalid`). +pub fn parse_op(derivation: &str, p: &Value) -> Option { + let pos = |v: &Value| int(v).filter(|&n| n >= 1); + match derivation { + CROP => { + let o = exact(p, &["x", "y", "w", "h"])?; + Some(Op::Crop { x: int(&o["x"])?, y: int(&o["y"])?, w: pos(&o["w"])?, h: pos(&o["h"])? }) + } + ROTATION => { + let o = exact(p, &["quarter_turns"])?; + int(&o["quarter_turns"]).filter(|q| (1..=3).contains(q)).map(Op::Rotation) + } + MIRROR => { + let o = exact(p, &["flip"])?; + Some(Op::Mirror { left_right: one_of(&o["flip"], &["left-right", "top-bottom"])? == "left-right" }) + } + syn::UPSCALE2 => exact(p, &[]).map(|_| Op::Upscale2), + syn::DENOISE3 => exact(p, &[]).map(|_| Op::Denoise3), + LUT => { + let o = exact(p, &["table"])?; + let t = unhex(o["table"].as_str()?)?; + (t.len() == 768).then_some(Op::Lut(t)) + } + OVERLAY => { + let o = exact(p, &["width", "height", "fill", "at"])?; + let fill: [u8; 3] = hexn(&o["fill"])?; + let at = o["at"] + .as_array()? + .iter() + .map(|a| { + let a = exact(a, &["x", "y"])?; + Some((int(&a["x"])?, int(&a["y"])?)) + }) + .collect::>>()?; + let (width, height) = (pos(&o["width"])?, pos(&o["height"])?); + size_ok(width, height).then_some(Op::Overlay { width, height, fill, at }) + } + GRID => { + let o = exact(p, &["columns", "rows"])?; + Some(Op::Grid { columns: pos(&o["columns"])?, rows: pos(&o["rows"])? }) + } + _ => None, + } +} + +impl Op { + /// The output size over inputs of these sizes, or `None` where the parameters do not hold + /// over them (`params_invalid`). + pub fn out_size(&self, sizes: &[(u64, u64)]) -> Option<(u64, u64)> { + let one = || (sizes.len() == 1).then(|| sizes[0]); + let (w, h) = match self { + Op::Crop { x, y, w, h } => { + let (iw, ih) = one()?; + (x.checked_add(*w)? <= iw && y.checked_add(*h)? <= ih).then_some((*w, *h))? + } + Op::Rotation(q) => { + let (iw, ih) = one()?; + if *q == 2 { (iw, ih) } else { (ih, iw) } + } + Op::Mirror { .. } | Op::Denoise3 | Op::Lut(_) => one()?, + Op::Upscale2 => { + let (iw, ih) = one()?; + (2 * iw, 2 * ih) + } + Op::Overlay { width, height, at, .. } => { + if at.len() != sizes.len() || sizes.is_empty() { + return None; + } + (*width, *height) + } + Op::Grid { columns, rows } => { + let first = *sizes.first()?; + if sizes.len() as u64 != columns.checked_mul(*rows)? || sizes.iter().any(|s| *s != first) { + return None; + } + (columns.checked_mul(first.0)?, rows.checked_mul(first.1)?) + } + }; + size_ok(w, h).then_some((w, h)) + } + + /// The input pixels output pixel (x, y) reads (§4.5): `(input, x, y)`. Empty for a canvas + /// pixel of an overlay that no input covers. + pub fn sources(&self, sizes: &[(u64, u64)], x: u64, y: u64, out: &mut Vec<(usize, u64, u64)>) { + out.clear(); + match self { + Op::Crop { x: cx, y: cy, .. } => out.push((0, cx + x, cy + y)), + Op::Rotation(q) => { + let (iw, ih) = sizes[0]; + let p = match q { + 1 => (y, ih - 1 - x), + 2 => (iw - 1 - x, ih - 1 - y), + _ => (iw - 1 - y, x), + }; + out.push((0, p.0, p.1)); + } + Op::Mirror { left_right } => { + let (iw, ih) = sizes[0]; + out.push((0, if *left_right { iw - 1 - x } else { x }, if *left_right { y } else { ih - 1 - y })); + } + Op::Lut(_) => out.push((0, x, y)), + Op::Upscale2 => { + let (iw, ih) = sizes[0]; + let (sx, sy) = (x / 2, y / 2); + let (x1, y1) = ((sx + 1).min(iw - 1), (sy + 1).min(ih - 1)); + let mut add = |p: (u64, u64)| { + if !out.contains(&(0, p.0, p.1)) { + out.push((0, p.0, p.1)); + } + }; + add((sx, sy)); + if x % 2 == 1 { + add((x1, sy)); + } + if y % 2 == 1 { + add((sx, y1)); + } + if x % 2 == 1 && y % 2 == 1 { + add((x1, y1)); + } + } + Op::Denoise3 => { + let (iw, ih) = sizes[0]; + for j in [-1i64, 0, 1] { + for i in [-1i64, 0, 1] { + let sx = (x as i64 + i).clamp(0, iw as i64 - 1) as u64; + let sy = (y as i64 + j).clamp(0, ih as i64 - 1) as u64; + if !out.contains(&(0, sx, sy)) { + out.push((0, sx, sy)); + } + } + } + } + Op::Overlay { at, .. } => { + for (k, ((ax, ay), (iw, ih))) in at.iter().zip(sizes).enumerate().rev() { + if *ax <= x && x < ax + iw && *ay <= y && y < ay + ih { + out.push((k, x - ax, y - ay)); + break; + } + } + } + Op::Grid { columns, .. } => { + let (cw, ch) = sizes[0]; + let k = (y / ch) * columns + x / cw; + out.push((k as usize, x % cw, y % ch)); + } + } + } + + /// Evaluate the operation over its inputs' samples (§4.5). + pub fn eval(&self, inputs: &[(u64, u64, &[u8])]) -> Option<(u64, u64, Vec)> { + let sizes: Vec<(u64, u64)> = inputs.iter().map(|(w, h, _)| (*w, *h)).collect(); + let (w, h) = self.out_size(&sizes)?; + let buf = match self { + Op::Upscale2 => syn::upscale2(inputs[0].2, sizes[0].0 as usize, sizes[0].1 as usize), + Op::Denoise3 => syn::denoise3(inputs[0].2, sizes[0].0 as usize, sizes[0].1 as usize), + Op::Lut(t) => inputs[0].2.chunks_exact(3).flat_map(|p| [t[p[0] as usize], t[256 + p[1] as usize], t[512 + p[2] as usize]]).collect(), + _ => { + let fill = match self { + Op::Overlay { fill, .. } => *fill, + _ => [0; 3], + }; + let mut out = Vec::with_capacity((w * h * 3) as usize); + let mut src = Vec::new(); + for y in 0..h { + for x in 0..w { + self.sources(&sizes, x, y, &mut src); + match src.first() { + Some(&(k, sx, sy)) => { + let i = ((sy * sizes[k].0 + sx) * 3) as usize; + out.extend_from_slice(&inputs[k].2[i..i + 3]); + } + None => out.extend_from_slice(&fill), + } + } + } + out + } + }; + Some((w, h, buf)) + } +} + +/// The spectral generator's model file, read where it has the members the reference generator +/// reads, each in a range it can compute with. +pub fn spectral_model(bytes: &[u8]) -> Option { + let v: Value = serde_json::from_slice(bytes).ok()?; + let lut = v.get("sine_lut")?.as_array()?; + let lut_size = v.get("lut_size")?.as_i64()?; + let small = |k: &str, max: u64| v.get(k).and_then(Value::as_u64).filter(|&n| n <= max).is_some(); + let ok = v.get("version")?.is_string() + && lut_size >= 1 + && lut.len() as i64 == lut_size + && lut.iter().all(|n| n.as_i64().is_some_and(|n| n.abs() <= 1 << 20)) + && small("freq_max", 1 << 12) + && small("amp_bits", 16) + && small("base_components", 1024) + && small("step_components", 1024) + && v.get("lut_bits").is_none_or(|b| b.as_u64().is_some_and(|b| b <= 20)) + && v.get("color_offsets")?.as_array().is_some_and(|c| c.len() == 3 && c.iter().all(|n| n.as_i64().is_some_and(|n| n.abs() <= 1 << 20))); + ok.then(|| crate::generate::SpectralModel::from_value(&v)) +} + +/// Whether a prompt's text is one an instruction object of `wai.generate.spectral` admits +/// (SPEC §5): 0 to 256 bytes from 0x20 to 0x7E, none `"` or `\`. +pub fn spectral_prompt_ok(text: &str) -> bool { + text.len() <= 256 && text.bytes().all(|b| (0x20..=0x7e).contains(&b) && b != b'"' && b != b'\\') +} + +// --------------------------------------------------------------------------------------- +// §5 The tree +// --------------------------------------------------------------------------------------- + +pub fn leaf(link: &[u8; 32]) -> [u8; 32] { + blake3(&[LEAF_DOMAIN, link]) +} + +pub fn node(l: &[u8; 32], r: &[u8; 32]) -> [u8; 32] { + blake3(&[NODE_DOMAIN, l, r]) +} + +/// The root over the steps' link hashes in `seq` order (§5.2). +pub fn root(links: &[[u8; 32]]) -> [u8; 32] { + let mut level: Vec<[u8; 32]> = links.iter().map(leaf).collect(); + while level.len() > 1 { + if level.len() % 2 == 1 { + level.push(*level.last().expect("non-empty")); + } + level = level.chunks_exact(2).map(|p| node(&p[0], &p[1])).collect(); + } + level.first().copied().unwrap_or([0; 32]) +} + +/// The inclusion proof of step `index` (§5.2): its siblings from the leaf level upward. +pub fn proof(links: &[[u8; 32]], index: usize) -> Vec<[u8; 32]> { + let mut level: Vec<[u8; 32]> = links.iter().map(leaf).collect(); + let mut i = index; + let mut out = Vec::new(); + while level.len() > 1 { + if level.len() % 2 == 1 { + level.push(*level.last().expect("non-empty")); + } + out.push(level[i ^ 1]); + level = level.chunks_exact(2).map(|p| node(&p[0], &p[1])).collect(); + i /= 2; + } + out +} + +/// ⌈log₂ n⌉, and 0 for one leaf. +pub fn proof_len(n: u64) -> usize { + if n <= 1 { 0 } else { (64 - (n - 1).leading_zeros()) as usize } +} + +/// Walk a proof from a step's leaf to a root (§5.2). +pub fn walk(link: &[u8; 32], seq: u64, siblings: &[[u8; 32]]) -> [u8; 32] { + let mut h = leaf(link); + for (i, s) in siblings.iter().enumerate() { + h = if (seq >> i) & 1 == 1 { node(s, &h) } else { node(&h, s) }; + } + h +} + +// --------------------------------------------------------------------------------------- +// §6 The contribution record +// --------------------------------------------------------------------------------------- + +#[derive(Clone, Debug)] +pub struct Record { + pub link: [u8; 32], + pub signer: [u8; 32], + pub session: [u8; 32], + pub steps: u64, + pub root: [u8; 32], + pub out_step: u64, + pub out_samples: [u8; 32], + pub w: u64, + pub h: u64, + pub content_hash: Option<[u8; 32]>, + pub map: [u8; 32], + pub origin: Option<[u8; 32]>, + pub estimates: Vec, +} + +pub const RECORD_MEMBERS: [&str; 11] = ["kind", "session", "steps", "root", "output", "map", "origin", "estimates", "issued_at", "signer_pubkey", "sig"]; + +/// Read the contribution record (§6). +pub fn read_record(text: &str) -> Result { + let (v, signer) = read_signed(text, "wai-contribution", &RECORD_MEMBERS)?; + let f = || { + let steps = int(&v["steps"]).filter(|&n| n >= 1)?; + let o = exact(&v["output"], &["step", "samples", "width", "height", "content_hash"])?; + let (w, h) = (int(&o["width"])?, int(&o["height"])?); + let out_step = int(&o["step"]).filter(|&s| s < steps)?; + let content_hash = nullable(&o["content_hash"], hexn)?; + let origin = nullable(&v["origin"], hexn)?; + let estimates = v["estimates"].as_array()?; + let est_ok = estimates.len() <= 16 + && estimates.iter().all(|e| { + exact(e, &["estimator", "class", "party", "basis", "share_ppm"]).is_some_and(|o| { + term(&o["estimator"]).is_some() + && term(&o["class"]).is_some() + && int(&o["party"]).is_some() + && one_of(&o["basis"], &["made_by", "directed_by"]).is_some() + && int(&o["share_ppm"]).is_some_and(|n| n <= 1_000_000) + }) + }); + (size_ok(w, h) && est_ok && (origin.is_none() || content_hash.is_some())).then_some(())?; + Some(Record { + link: link_hash(&v), + signer, + session: hexn(&v["session"])?, + steps, + root: hexn(&v["root"])?, + out_step, + out_samples: hexn(&o["samples"])?, + w, + h, + content_hash, + map: hexn(&v["map"])?, + origin, + estimates: estimates.clone(), + }) + }; + let r = f().ok_or(Reason::RecordMalformed)?; + check_signature(&v, &signer)?; + Ok(r) +} + +// --------------------------------------------------------------------------------------- +// §7 The authorship map +// --------------------------------------------------------------------------------------- + +/// A set of a label (§7.1): parties, and the two markers. +#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Hash, PartialOrd, Ord)] +pub struct Set { + pub parties: u64, + pub unknown: bool, + pub undisclosed: bool, +} + +impl Set { + pub const EMPTY: Set = Set { parties: 0, unknown: false, undisclosed: false }; + pub const UNKNOWN: Set = Set { parties: 0, unknown: true, undisclosed: false }; + pub const UNDISCLOSED: Set = Set { parties: 0, unknown: false, undisclosed: true }; + + pub fn party(p: u64) -> Set { + Set { parties: 1 << p, ..Set::EMPTY } + } + + pub fn with(self, p: u64) -> Set { + Set { parties: self.parties | 1 << p, ..self } + } + + pub fn union(self, o: Set) -> Set { + Set { parties: self.parties | o.parties, unknown: self.unknown || o.unknown, undisclosed: self.undisclosed || o.undisclosed } + } + + pub fn has(&self, p: u64) -> bool { + self.parties >> p & 1 == 1 + } + + /// The set as §7.3 writes it. + pub fn to_json(self) -> Value { + let mut a: Vec = (0..64).filter(|p| self.has(*p)).map(|p| json!(p)).collect(); + if self.unknown { + a.push(json!("unknown")); + } + if self.undisclosed { + a.push(json!("undisclosed")); + } + Value::Array(a) + } +} + +/// A sample's label (§7.1). +#[derive(Clone, Copy, Debug, Default, PartialEq, Eq, Hash, PartialOrd, Ord)] +pub struct Label { + pub made_by: Set, + pub directed_by: Set, +} + +impl Label { + pub const UNKNOWN: Label = Label { made_by: Set::UNKNOWN, directed_by: Set::UNKNOWN }; + pub const UNDISCLOSED: Label = Label { made_by: Set::UNDISCLOSED, directed_by: Set::UNDISCLOSED }; + + fn directed(self, p: u64) -> Label { + Label { directed_by: self.directed_by.with(p), ..self } + } +} + +/// The map of a state: one label everywhere, or one label for each pixel. +#[derive(Clone, Debug, PartialEq, Eq)] +pub enum StateMap { + Const(Label), + Pixels { w: u64, labels: Vec