how to verify goby signature

verify-goby-signature.js

const loadBls = require("bls-signatures");
const crypto = require("crypto");

(async () => {

  const BLS = await loadBls();
  const encoder = new TextEncoder('utf-8')

  function formatMessage(message) {
    const prefix = `\u0018Chia Signed Message:\n${message.length}`;
    const hash = crypto.createHash('sha256');
    hash.update(encoder.encode(prefix))
    hash.update(message)

    return hash.digest('hex')
  }

  function hexToBytes(hex) {
    if (hex.startsWith("0x")) {
      hex = hex.slice(2);
    }
    const bytes = Uint8Array.from(hex.match(/.{1,2}/g).map((byte) => parseInt(byte, 16)));

    return bytes
  }

  function verify(message, publicKey, signature) {
    const syntheticMessage = formatMessage(message);
    publicKey = BLS.G1Element.from_bytes(hexToBytes(publicKey));
    signature = BLS.G2Element.from_bytes(hexToBytes(signature));
    console.log("verified: ", BLS.AugSchemeMPL.verify(publicKey, hexToBytes(syntheticMessage), signature));
  }

  verify(encoder.encode("hello chia"), "0x858024f64b04a9abc6622a61e2c823b78a43d219c502719d12a78fd6cad5daa31f80254b1803689a9433960c609f9b92", "0x8ee997eb62ad11a9b781d123862d3fe9cfb65a7862c1e0a86618c739119d636a85722e87bdbc3da4cd5a1676dc3836c617a2b176e91dd7b8f8d126fbec509d751e2f811db009a01d0a4438b3c2eaf99b51b76d805700405564b9fc7b52a29625");
})();

// L16 Uint8Array concat error
hash.update(encoder.encode(prefix))
hash.update(message)


//L39 syntheticMessage should be Uint8Array
console.log("verified: ", BLS.AugSchemeMPL.verify(publicKey, hexToBytes(syntheticMessage), signature));

@roseiliend Ah I see, this totally works now. Thanks!

I updated the gist to a working version.