[meta] Element Web's requirements for crypto-js

[Hywan]

Address element-hq/element-web#21972.

This is not a secret that Element Web will use matrix-sdk-crypto-js in a near future. This meta issue provides a list of additional features we want to see in matrix-sdk-crypto-js that are required for Element Web. This list is inspired by Element Web R: Internal Plan, and by various wishes I've heard here and there.

Each new feature respects the Rust team' standards: It is highly tested, well-documented, reviewed, and will improve the underlying layers if needed.

Foundational

• Build pipeline for producing a NPM-compatible Wasm package:
  • chore(crypto-js): Add a release workflow for crypto-js #966
  • chore(crypto-js): Add npm run pack #981

Basic encryption/decryption

• Storage implementation
  • feat(crypto-js): Add store configuration to the OlmMachine constructor #971
• Bindings for the minimal interface to support basic encryption/decryption
  • feat(crypto-js): Implement OlmMachine.sign and .cross_signing_status #955
  • feat(crypto-js): Implement the Attachment API #958
  • OlmMachine.encryptRoomEvent, ….decryptRoomEvent and ….shareRoomKey are already implemented #1040
• Fix bugs from community testing session

Table-stakes Functionality

• Cross-signing bindings (Key Verification with Emojis, QR code, or manually, identity and bootstrapping)
  • feat(crypto-js): Implement key verification #788
• Cross-signing shields/verification status
  • OlmMachine.cross_signing_status is implemented, not sure if it validates this item
  • feat(crypto-js): Implement OlmMachine.get_identity #1039
• Key backup bindings
  • feat(sdk): Rename (export|import)_keys to (export|import)_room_keys #1058
  • feat(crypto-js): Implement OlmMachine.export_room_keys and .import_room_keys #1059
• Room key forwarding/key sharing
  • feat(crypto): Port to Wasm (in a JS host) and to NodeJS #675
  • feat: Rename OlmMachine.share_group_session to OlmMachine.share_room_key #723
• Historical room key sharing
  • Not implemented in matrix_sdk_crypto yet.
• Custom to-device message bindings (for MSC3401 VoIP)
• Bindings to reset/replace key backup & cross-signing (and/or SSSS)
  • Not implemented in matrix_sdk_crypto yet.
• Fix bugs from community testing session

Ship It

• Test and address performance concerns if any
• Fix bugs from community testing session

[Hywan]

It's shipped, forgot to close this issue!