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opaque-wasm

License npm (client) npm (server)

Wrapper for opaque-ke to implement the OPAQUE protocol in JavaScript/WASM.

This repo contains 2 packages: a client package and a server package. This allows an application to use this library in a browser without shipping useless server code (and vice-versa). It also allows the use of different compilation profiles: the client is optimized for size (-Os) and uses lol_alloc as the allocator, while the server binary is optimized for performance (-O3) and uses the default Rust allocator.

This library uses the following OPAQUE configuration, based on the recommendations of the OPAQUE draft and the Argon2 RFC:

  • OPRF: ristretto255-SHA512
  • KDF: HKDF-SHA-512
  • MAC: HMAC-SHA-512
  • Hash: SHA-512
  • KSF: Argon2id(S = zeroes(16), p = 4, T = Nh, m = 2^16, t = 3, v = 0x13, K = nil, X = nil, y = 2)
  • Group: ristretto255

If you use different implementations for the client and server side, make sure to match the configurations accordingly.

Installation and usage

See the client and server folders for more information about the bits you need.

A complete example (client + server) is available in the example folder, with a lot of comments to guide you through.

Credits where due

This wrapper is inspired from prior work at marucjmar/opaque-wasm. The implementation differs in multiple ways, especially regarding the split client/server packages. The API is also very different.