EVM Signature#

// signOrderRFQ.js
import { Wallet, ethers } from "ethers";

/**
 * Sign an OrderRFQ-typed struct and return the signature string
 *
 * @param {string} privateKey - Signer's private key (EOA)
 * @param {string} verifyingContract - Address of the contract used for signature verification
 * @param {number} chainId - Current chain ID
 * @param {object} order - Order object containing fields like rfqId, expiration, etc.
 * @returns {Promise<string>} - EIP-712 signature string
 */
export async function signOrderRFQ({ privateKey, verifyingContract, chainId, order }) {
  const wallet = new Wallet(privateKey);

  const domain = {
    name: "OKX Lab PMM Protocol",
    version: "1.0",
    chainId,
    verifyingContract,
  };

  const types = {
    OrderRFQ: [
      { name: "rfqId", type: "uint256" },
      { name: "expiry", type: "uint256" },
      { name: "makerAsset", type: "address" },
      { name: "takerAsset", type: "address" },
      { name: "makerAddress", type: "address" },
      { name: "makerAmount", type: "uint256" },
      { name: "takerAmount", type: "uint256" },
      { name: "usePermit2", type: "bool" },
    ],
  };

  const signature = await wallet.signTypedData(domain, types, order);
  return signature;
}

import { signOrderRFQ } from "./signOrderRFQ.js";
import { ethers } from "ethers";

const currentTime = Math.floor(Date.now() / 1000);
const expiry = currentTime + 90;
const sig = await signOrderRFQ({
    // foundry local public test account
    privateKey: "0xac0974bec39a17e36ba4a6b4d238ff944bacb478cbed5efcae784d7bf4f2ff80",
    // PMM settlement contract (`pool` as adapter's perspective)
    verifyingContract: "0xa513E6E4b8f2a923D98304ec87F64353C4D5C853",
    chainId: 31337,
    order: {
        rfqId: 1,
        expiry: expiry,
        makerAsset: "0x111111111117dC0aa78b770fA6A738034120C302",
        takerAsset: "0xEeeeeEeeeEeEeeEeEeEeeEEEeeeeEeeeeeeeEEeE",
        makerAddress: "0xf39Fd6e51aad88F6F4ce6aB8827279cffFb92266",
        // 100000000000000000000
        makerAmount: ethers.parseUnits("100", 18),
        // 500000000000000000
        takerAmount: ethers.parseUnits("0.5", 18),
        usePermit2: false,
    },
});

console.log("Signature:", sig);