93 lines
2.5 KiB
Svelte
93 lines
2.5 KiB
Svelte
<!-- SignVerifyMessage.svelte -->
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<script lang="ts">
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import { ethers } from "ethers";
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import { createEventDispatcher } from "svelte";
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export let litNodeClient;
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export let currentPKP;
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export let sessionSigs;
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export let messageToSign = { user: "Sam", loggedIn: true };
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let status = "";
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let jsonObjectToVerify = null;
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const dispatch = createEventDispatcher();
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async function signMessageWithPKP() {
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const userConfirmed = window.confirm(
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"Do you want to sign the following message?\n\n" +
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JSON.stringify(messageToSign, null, 2)
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);
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if (!userConfirmed) {
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status = "User did not allow to sign the message.";
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dispatch("status", status);
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return;
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}
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try {
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// Create a specific JSON object
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const jsonString = JSON.stringify(messageToSign);
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// Convert the JSON string to an array of character codes
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const toSign = ethers.getBytes(ethers.hashMessage(jsonString));
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const litActionCode = `
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const go = async () => {
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const sigShare = await LitActions.signEcdsa({ toSign, publicKey, sigName });
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};
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go();
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`;
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// Sign message
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const results = await litNodeClient.executeJs({
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code: litActionCode,
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sessionSigs: sessionSigs,
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jsParams: {
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toSign: toSign,
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publicKey: currentPKP.publicKey,
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sigName: "sig1",
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},
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});
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// Get signature
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const result = results.signatures["sig1"];
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const signature = ethers.Signature.from({
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r: "0x" + result.r,
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s: "0x" + result.s,
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v: result.recid,
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});
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// Add the signature to the JSON object
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messageToSign.signature = signature;
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jsonObjectToVerify = { ...messageToSign };
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// Display the signed JSON
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status = JSON.stringify(messageToSign, null, 2);
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// Verify the signature
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const recoveredAddr = ethers.verifyMessage(jsonString, signature);
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// Check if the address associated with the signature is the same as the current PKP
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const verified =
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currentPKP.ethAddress.toLowerCase() === recoveredAddr.toLowerCase();
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if (verified) {
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status = "The signature is valid.";
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} else {
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status = "The signature is invalid.";
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}
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dispatch("status", status);
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} catch (err) {
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console.error(err);
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dispatch("error", err);
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}
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}
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</script>
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<button on:click={signMessageWithPKP}>Sign Message</button>
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{#if messageToSign}
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<pre>{JSON.stringify(messageToSign)}</pre>
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{/if}
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