eth-crypto/dist/es/vrs.js

Cryptographic functions for ethereum and how to use them with web3 and solidity

import { utils as ethersUtils } from 'ethers';
/**
 * split signature-hex into parts
 * @param  {string} hexString
 * @return {{v: string, r: string, s: string}}
 */
export function fromString(hexString) {
  var arr = ethersUtils.splitSignature(hexString);
  return {
    // convert "v" to hex
    v: "0x".concat(arr.v.toString(16)),
    r: arr.r,
    s: arr.s
  };
}

/**
 * merge signature-parts to one string
 * @param  {{v: string, r: string, s: string}} sig
 * @return {string} hexString
 */
export function toString(sig) {
  return ethersUtils.joinSignature(sig);
}