EdDSA on Baby JubJub Elliptic Curve using Poseidon hash

eddsa.js

const { buildEddsa } = require("circomlibjs"); // ^0.1.7
const { Scalar } = require("ffjavascript"); // ^0.2.57

async function main() {
  const eddsa = await buildEddsa();
  
  // EdDSA for KYC
  const poseidonHash = eddsa.poseidon([
    BigInt("0x830a030549a7E18db3FffE449ECd44A2D51436D2"), // EoA
    BigInt(631040090), // KYC rules
    BigInt(1678258616460), // Timestamp
    BigInt(56), // Chain ID
  ]);
  
  // EdDSA for KYT 
  // const poseidonHash = eddsa.poseidon([
  //   BigInt("0x44448c9bb6805d7c44602854c352f718de389c16"), // Sender
  //   BigInt("0xad585afee404a055b41e0927d475a744da3ec791"), // Receiver
  //   BigInt("0x056bc75e2d63100000"), // Amount
  //   BigInt("0xe3a59d5e33c6540e18aaa46bf98917ac3158db0d"), // Token ID
  //   BigInt("631050090"), // Rule ID
  //   BigInt(56), // Chain ID
  // ]);
  const msg = eddsa.babyJub.F.e(Scalar.fromRprLE(poseidonHash, 0));
  const prvKey = Buffer.from(
    "0001020304050607080900010203040506070809000102030405060708090001",
    "hex"
  );

  const pubKey = eddsa.prv2pub(prvKey);
  const signature = eddsa.signPoseidon(prvKey, msg);

  const pSignature = eddsa.packSignature(signature);
  const uSignature = eddsa.unpackSignature(pSignature);
  const isValidSig = eddsa.verifyPoseidon(msg, uSignature, pubKey);
  console.log({ isValidSig }); // { isValidSig: true }
}

main()
  .then(() => {
    process.exit(0);
  })
  .catch((err) => {
    console.log(err);
    process.exit(1);
  });