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Prerequisites

Lit Login Server & Lit Auth Server URLs. Please refer to Auth Services section.
1

Sign in with Google

To sign in with Google, you can use the authenticate function provided by the GoogleAuthenticator.
import { GoogleAuthenticator } from "@lit-protocol/auth";

const authData = await GoogleAuthenticator.authenticate(
  "https://login.litgateway.com"
);
2

Get or Mint a PKP

You can select an existing PKP associated with your account or mint a new one.
const res = await litClient.authService.mintWithAuth({
  authData: authData,
});
3

Generate Auth Context

Use your PKP’s public key to create an AuthContext. This method will cache two things:
  1. session key pair - a temporary cryptographic key pair generated on the client side that acts as a temporary identity for the client application. It consists of:
    • A public key - shared with the Lit nodes
    • A secret key (private key) - kept securely on the client
  2. Delegation AuthSig aka. the inner auth sig - a cryptographic attestation from the Lit Protocol nodes that authorises your session key to act on behalf of your PKP.

const authContext = await authManager.createPkpAuthContext({
  authData: authData, // <-- Retrieved earlier
  pkpPublicKey: pkpInfo.pubkey,
  authConfig: {
    resources: [
      ["pkp-signing", "*"],
      ["lit-action-execution", "*"],
    ],
    expiration: new Date(Date.now() + 1000 * 60 * 60 * 24).toISOString(),
    statement: "",
    domain: window.location.origin,
  },
  litClient: litClient,
});