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metamask_ic

Example project to explore signing Internet Computer calls with Metamask.

You need to have the MetaMask browser extension installed, and you need to have Toggle eth_sign requests activated. You can find this setting in settings > advanced to the bottom.

How to run?

cd metamask_ic/
npm install
npm run patch-agent
dfx start --background --clean
dfx deploy metamask_ic_backend
npm run start

Point your browser to http://localhost:8080 and check the console.

What's happening

  • When clicking on "Login with Metamask", we ask MetaMask for a signature on some message. We use the signature to recover the ECDSA public key of the MetaMask account.
  • We use @dfinity/identity-secp256k1 to convert the public to DER format and to compute the principal.
  • When clicking on "Click me!", we prepare a call to the backend canister using a patched version of @dfinity/agent.
  • We then calculate the requestId and let MetaMask sign sha256(concat(domainSeparator, requestId))
  • We remove the last byte from the signature, as the Internet Computer expects a 64-byte signature without the recovery byte.
  • We set sender_pubkey to the DER public key and sender_sig to the signature (after transforming it to a byte array)
  • Then we use the patched @dfinity/agent to submit the request.

Issue

Currently, the ingress validator doesn't accept the signature, e.g

  Code: 403 (Forbidden)
  Body: Failed to authenticate request 0xd37d3bb9cd4319cb8adb8d31e5cdfce455dd4ba6a8b98b447c26262a79f8ca9b due to: Invalid signature: Invalid basic signature: EcdsaSecp256k1 signature could not be verified: public key 046c0d2f36e02d0a146c23c542108c2d584b1fb5b8b4cbda2f6673b97622438267af48ec70019c533be54a49c2c3cf7befbd094d3af799a35c2e31dcb350983ab5, signature a7d8bd1fa0e67fcf27aa952b8cc27febda6419c18706aef6970b1b22f62678923a4857d1f4d62ea606b829192c6dbbd03607713413b1b51b59df509d0f4db586, error: verification failed
  Retrying request.
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