RFC adding third party Ed25519, HPKE, and CBOR libs

rfcs/additional_cypto_cbor_libs.md

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+# RFC 208: additional crypto and CBOR libraries
+
+## Summary
+
+Several new web APIs require additional cryptography and CBOR libraries to
+properly test. These libraries are to support cryptography and the CBOR
+protocols not otherwise supported in JavaScript or Python, namely Ed25519,
+HPKE, and CBOR. There are open source libraries commonly available that
+implement these protocols and have compatible licenses. This RFC proposes
+adding such libraries to the tools/ directory so that web-platform-tests may
+exercise and verify proper compatible implementations of these new web APIs.
+
+## Details
+
+We're proposing adding these libraries (or some very similar ones) to the
+tools/ directory:
+
+An Ed25519 Python implementation:
+https://github.com/pyca/ed25519/blob/main/ed25519.py
+
+An HPKE JavaScript implementation:
+https://github.com/dajiaji/hpke-js
+
+A CBOR JavaScript implementation:
+https://github.com/paroga/cbor-js/blob/master/cbor.js
+
+## Risks
+
+Users of these libraries may need to update them from time to time if new
+functionality or fixes are required. This is likely not a big risk.
+
+The HPKE library proposed may require inclusion of some other dependent
+libraries and uses deno to build into a single JavaScript file. Perhaps
+it's simplest to commit the single transpiled JavaScript file.