// SPDX-License-Identifier: MIT
pragma solidity ^0.6.12;

import "./StringsLib.sol";


/**
 * @title ECDSA extended library
 */
library ECDSAExtendedLib {
  using StringsLib for uint;

  function toEthereumSignedMessageHash(
    bytes memory message
  )
    internal
    pure
    returns (bytes32)
  {
    return keccak256(abi.encodePacked(
      "\x19Ethereum Signed Message:\n",
      message.length.toString(),
      abi.encodePacked(message)
    ));
  }
}