feat: support EIP-7524 PLUME signatures

[chiefbiiko]

Explanation

This PR adds a new eth_getPlumeSignature RPC method that implements a novel ECDSA nullifier scheme as described in EIP-7524.

The eth_getPlumeSignature method takes in two parameters, a message and an address, then generates a deterministic signature (PLUME) and several other inputs. The plume can be used as a nullifier to prevent double-spending in an anonymity set. This capability unlocks novel on-chain behavior, such as private DAO voting, fair, non-doxxing airdrops, and more.

Screenshot

Manual Testing Steps

After building and running Rabby locally, enter this into the browser console:

await window.ethereum.request({
  "method": "eth_requestAccounts",
  "params": []
});

accountAddress = (await window.ethereum.request({
  "method": "eth_accounts",
  "params": []
}))[0];

await window.ethereum.request({
  "method": "eth_getPlumeSignature",
  "params": [
    "this is a test message",
    accountAddress
  ]
});

A confirmation screen should open up. After clicking "Sign", you will see the plume and other signals outputted into the console.

Needs RabbyHub/eth-simple-keyring#3

[socket-security]

New dependencies detected. Learn more about Socket for GitHub ↗︎

Package	New capabilities	Transitives	Size	Publisher
npm/@colors/colors@1.5.0	environment	0	39.5 kB	dabh
npm/amcl-js@3.1.0	Transitive: environment, filesystem	+14	3.35 MB
npm/js-sha256@0.10.1	None	0	38.9 kB	emn178
npm/plume-sig@2.0.3	Transitive: environment, filesystem	+17	3.5 MB

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