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+# Vendored third-party assets
+
+The SPA is served under a CSP that forbids every external host, so anything it
+uses has to live here. Each entry records exactly what was taken and from where,
+so it can be checked or rebuilt without guesswork.
+
+## argon2.min.js
+
+| | |
+|---|---|
+| Package | `argon2-browser` 1.18.0 (npm) |
+| Source | https://registry.npmjs.org/argon2-browser/-/argon2-browser-1.18.0.tgz |
+| Tarball sha256 | `cdb11795a4971bde095fe6b836aa424de50c4558ed4b9505bc74111eee7f6d35` |
+| Tarball sha1 (npm dist.shasum) | `f35820211e0a431aed7f82b9348477234be69bec` |
+| File taken | `package/dist/argon2-bundled.min.js` |
+| File sha256 | `77c64b946baf1a5116dc591f4b9965d636b1b455f75edd2d4a587cb75e01687b` |
+
+The bundled build carries the WebAssembly inline as base64, so there is no second
+request and nothing to locate at runtime.
+
+**Why it is here at all:** WebCrypto has no memory-hard KDF. The encrypted
+keypair bundle is protected by the passphrase alone and rests on every node whose
+group its owner joins (finding C4), so PBKDF2 — compute-only, and therefore cheap
+on a GPU — was the wrong tool for it. Measured through this build on the dev
+machine: Argon2id 128 MB / t=3 / p=1 takes ~640 ms, against ~240 ms for
+PBKDF2-SHA512 at 600k, for a memory cost a GPU cannot ignore.
+
+### argon2.wasm
+
+The same build's standalone WebAssembly, sha256
+`0c2149886c13e4eae4a6ca25ee71d47423c5c8740a874cf04ff816d1b2c901d7`.
+
+The browser never requests it — `argon2.min.js` carries the same bytes inline as
+a data URL. It is kept because the cross-language parity test drives the vendored
+library under node, where the emscripten loader takes its file path instead of the
+inline copy, and a test that cannot run is a test that stops being true.