@rhino.fi/client-js/src/api/sign/sign.js

/**
 * Signs toSign asyncronously
 *
 * For more information, check:
 * https://web3js.readthedocs.io/en/1.0/web3-eth.html#sign
 */
module.exports = async (dvf, toSign, signWithStarkProvider) => {
  // metamask will take care of the 3rd parameter, "password"
  if (
    dvf.web3.currentProvider.isMetaMask
    || dvf.web3.currentProvider.isWalletConnect
    || dvf.web3.currentProvider.isCoinbaseWallet
  ) {
    return dvf.web3.eth.personal.sign(toSign, dvf.get('account'))
  } else if (dvf.web3.currentProvider.connector) {
    return dvf.web3.currentProvider.connector.signPersonalMessage([
      toSign,
      dvf.get('account'),
    ])
  } else if (signWithStarkProvider) { // Smart-wallet (Authereum) case
    return dvf.web3.eth.personal.sign(toSign, dvf.get('account'))
  } else {
    return dvf.web3.eth.sign(toSign, dvf.get('account'))
  }
}