feat(signature): prototype cryptographic signature renderer

package.json

@@ -30,6 +30,7 @@
     "type-check:presets": "pnpm --filter './packages/presets/**' type-check",
     "test:i18n": "node apps/viewer-demo/scripts/verify-japanese-i18n.mjs",
     "test:spreadsheet-github-178": "pnpm --filter @file-viewer/renderer-spreadsheet verify:github-178",
+    "test:signature-github-206": "pnpm --filter @file-viewer/renderer-signature verify:github-206",
     "test:thumbnail": "pnpm --filter @file-viewer/thumbnail test",
     "test": "pnpm test:i18n && pnpm test:thumbnail",
     "type-check:components": "pnpm --filter @file-viewer/web type-check && pnpm --filter @file-viewer/react type-check && pnpm --filter @file-viewer/react-legacy type-check && pnpm --filter @file-viewer/vue3 type-check && pnpm --filter @file-viewer/vue2.7 type-check && pnpm --filter @file-viewer/vue2.6 type-check && pnpm --filter @file-viewer/jquery type-check && pnpm --filter @file-viewer/svelte type-check",

packages/components/web-full/package.json

@@ -81,6 +81,7 @@
     "@file-viewer/renderer-ofd": "workspace:2.4.0",
     "@file-viewer/renderer-pdf": "workspace:2.4.0",
     "@file-viewer/renderer-presentation": "workspace:2.4.0",
+    "@file-viewer/renderer-signature": "workspace:2.4.0",
     "@file-viewer/renderer-spreadsheet": "workspace:2.4.0",
     "@file-viewer/renderer-text": "workspace:2.4.0",
     "@file-viewer/renderer-typst": "workspace:2.4.0",

packages/presets/all/package.json

@@ -72,6 +72,7 @@
     "@file-viewer/renderer-ofd": "workspace:2.4.0",
     "@file-viewer/renderer-pdf": "workspace:2.4.0",
     "@file-viewer/renderer-presentation": "workspace:2.4.0",
+    "@file-viewer/renderer-signature": "workspace:2.4.0",
     "@file-viewer/renderer-spreadsheet": "workspace:2.4.0",
     "@file-viewer/renderer-text": "workspace:2.4.0",
     "@file-viewer/renderer-typst": "workspace:2.4.0",

packages/presets/all/src/index.ts

@@ -24,6 +24,7 @@ import { modelRenderer } from '@file-viewer/renderer-3d';
 import { ofdRenderer } from '@file-viewer/renderer-ofd';
 import { pdfRenderer } from '@file-viewer/renderer-pdf';
 import { presentationRenderer } from '@file-viewer/renderer-presentation';
+import { signatureRenderer } from '@file-viewer/renderer-signature';
 import { spreadsheetRenderer } from '@file-viewer/renderer-spreadsheet';
 import { textRenderer } from '@file-viewer/renderer-text';
 import { typstRenderer } from '@file-viewer/renderer-typst';
@@ -61,7 +62,7 @@ export const fileViewerAllRendererPlugin: FileViewerRendererPlugin<BrowserRender
 export const allRenderers: FileViewerRendererPreset<BrowserRendererHandler> = {
   id: 'file-viewer-preset-all',
   label: 'Flyfish File Viewer full renderer preset',
-  renderers: [wordRenderer, wordPerfectRenderer, hangulRenderer, iworkRenderer, pdfRenderer, ofdRenderer, presentationRenderer, spreadsheetRenderer, cadRenderer, typstRenderer, drawingRenderer, modelRenderer, archiveRenderer, emailRenderer, ebookRenderer, textRenderer, imageRenderer, mediaRenderer, mindmapRenderer, geoRenderer, dataRenderer, edaRenderer, fileViewerAllRendererPlugin],
+  renderers: [wordRenderer, wordPerfectRenderer, hangulRenderer, iworkRenderer, pdfRenderer, ofdRenderer, presentationRenderer, spreadsheetRenderer, signatureRenderer, cadRenderer, typstRenderer, drawingRenderer, modelRenderer, archiveRenderer, emailRenderer, ebookRenderer, textRenderer, imageRenderer, mediaRenderer, mindmapRenderer, geoRenderer, dataRenderer, edaRenderer, fileViewerAllRendererPlugin],
 };
 
 export const fileViewerPresetAll = allRenderers;

packages/renderers/signature/LICENSE

@@ -0,0 +1,160 @@
+Apache License
+Version 2.0, January 2004
+http://www.apache.org/licenses/
+
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+Copyright 2026 Flyfish Viewer

packages/renderers/signature/README.en.md

@@ -0,0 +1,137 @@
+# @file-viewer/renderer-signature
+
+Optional, browser-local renderer for cryptographic signatures and timestamp containers. It keeps CMS/CAdES/RFC 3161/RFC 5544 support in TypeScript/Web Crypto and adds OpenPGP inspection through an optional rPGP WebAssembly backend.
+
+## Supported formats
+
+- CMS / PKCS#7 / CAdES-adjacent containers: `.p7m`, `.p7s`, `.p7b`, `.p7c`, `.pkcs7`, `.cms`, `.cmsc`
+- RFC 3161 timestamp requests, responses and tokens: `.tsq`, `.tsr`, `.tst`
+- RFC 5544 `TimeStampedData`: `.tsd`
+- OpenPGP routing and inspection: `.asc`, `.sig`, `.pgp`, `.gpg`
+
+The renderer uses content detection as well as extensions. An `.asc` file can therefore be classified as a message, detached signature, cleartext-signed message, public key or private key instead of being treated as a single fixed format.
+
+ASiC, ERS, PAdES, XMLDSig/XAdES and JWS/JAdES remain outside the current implementation.
+
+## Optional registration
+
+```ts
+import { signatureRenderer } from '@file-viewer/renderer-signature';
+
+const options = {
+  rendererMode: 'replace',
+  renderers: [signatureRenderer],
+};
+```
+
+To preview extracted PDF or literal data, compose the signature renderer with the relevant optional renderer:
+
+```ts
+import { pdfRenderer } from '@file-viewer/renderer-pdf';
+import { signatureRenderer } from '@file-viewer/renderer-signature';
+
+const options = {
+  rendererMode: 'replace',
+  renderers: [signatureRenderer, pdfRenderer],
+};
+```
+
+`@file-viewer/preset-all` includes this renderer explicitly, but `@file-viewer/core` does not import it.
+
+## OpenPGP backend
+
+OpenPGP is implemented with rPGP (`pgp` crate `0.20.0`) compiled to WebAssembly. The renderer therefore uses the Rust rPGP backend directly; no additional JavaScript cryptography dependency, GnuPG executable, keyserver integration or server-side conversion is required.
+
+The loading path is deliberately lazy:
+
+```text
+File Viewer starts
+→ no rPGP Worker or WASM is loaded
+→ an OpenPGP file is routed to renderer-signature
+→ ./openpgp/client.js is dynamically imported
+→ signature.worker.js is created
+→ the Worker dynamically imports rpgp_wrapper.js
+→ rpgp_wrapper_bg.wasm is initialized inside the Worker
+```
+
+The Rust wrapper intentionally exposes only three operations:
+
+```text
+classify_openpgp
+inspect_openpgp
+verify_detached_signature
+```
+
+It does not expose the low-level rPGP object model to JavaScript.
+
+### OpenPGP scope
+
+The current backend supports classification and bounded inspection of armored or binary OpenPGP messages, detached signatures, public keys, private-key blocks and unencrypted literal-data messages. Detached signatures can be verified with host/user-supplied public keys. Safely bounded unencrypted literal data can be passed to File Viewer's nested renderer mechanism.
+
+Encrypted messages are inspection-only. Compressed messages are not recursively expanded unless a future implementation can enforce strict decompressed-output limits. Private-key blocks expose only public metadata derived from the key; secret MPIs, private scalars, passphrases and session keys are never returned to TypeScript.
+
+Signing, key generation, private-key unlocking and message decryption are intentionally not exposed in this phase.
+
+Host applications may supply public keys with `options.signature.openPgpPublicKeys`. Detached original content continues to use `options.signature.originalContent`.
+
+## Default OpenPGP resource limits
+
+The browser client applies conservative defaults before sending work to WASM:
+
+| Limit | Default |
+| --- | ---: |
+| input | 32 MiB |
+| extracted output | 16 MiB |
+| packet count | 4096 |
+| nesting depth | 16 |
+| user IDs | 128 |
+| subkeys | 128 |
+| signatures | 256 |
+
+They can be overridden with `options.signature.openPgpLimits`. The Rust boundary revalidates input size and bounds returned literal data. No untrusted input is intentionally processed on the main UI thread beyond lightweight routing hints.
+
+## CMS and timestamp behavior
+
+The existing browser-local CMS/timestamp implementation can inspect CMS `SignedData`, certificate-only containers and CRLs, parse DER and CMS PEM, recognize CAdES `signingCertificateV2`, verify supported RSA/ECDSA signatures using Web Crypto, compare detached `messageDigest` values, inspect RFC 3161 requests/responses/tokens, and inspect RFC 5544 `TimeStampedData` with embedded or external content.
+
+External RFC 5544 `dataUri` values are displayed as untrusted metadata and are never fetched automatically.
+
+## Security and validation boundary
+
+Successful parsing is not signature verification. Successful cryptographic verification is not certificate/key trust, policy compliance, identity assurance, qualified-signature status or legal validity. The issue #206 CMS/timestamp fixture CA is synthetic and deliberately untrusted.
+
+The OpenPGP Worker never persists keys or file contents, never performs automatic network lookup and can be terminated through the renderer client cleanup path. The first rPGP phase avoids private-key cryptographic operations; this also avoids depending on private-key RSA operations for which upstream RustCrypto/rPGP documentation requires additional side-channel consideration.
+
+## Building the rPGP WASM backend
+
+A Rust toolchain is required only when building the optional OpenPGP backend:
+
+```bash
+rustup target add wasm32-unknown-unknown
+cargo install wasm-bindgen-cli
+pnpm --filter @file-viewer/renderer-signature build:wasm
+```
+
+`wasm-opt` is optional; when installed, the build script applies `-Oz`. The script generates `rust/Cargo.lock` if it does not exist, then performs a locked release build and reports raw and Brotli WASM size.
+
+The regular TypeScript type-check does not require Rust:
+
+```bash
+pnpm --filter @file-viewer/renderer-signature type-check
+```
+
+## Verification
+
+The repository contains the contributed non-secret CMS/timestamp fixture corpus under `test/fixtures/github-206-contributed`.
+
+```bash
+pnpm --filter @file-viewer/renderer-signature verify:github-206
+pnpm --filter @file-viewer/renderer-signature verify:fixtures
+pnpm --filter @file-viewer/renderer-signature verify:openpgp
+```
+
+`verify:openpgp` checks the lazy Worker/WASM boundary, pinned rPGP configuration, absence of GnuPG invocation, restricted wrapper API and TypeScript content-detection behavior. Runtime rPGP fixture tests require the WASM backend to be built first.
+
+## Third-party licensing
+
+The Rust backend uses the permissively licensed rPGP `pgp` crate. See `THIRD_PARTY_NOTICES.md`.