Signature Validation

contract ERC1271 {

  // bytes4(keccak256("isValidSignature(bytes32,bytes)"))
  bytes4 constant internal MAGICVALUE = 0x1626ba7e;

  /**
   * @dev Should return whether the signature provided is valid for the provided hash
   * @param _hash      Hash of the data to be signed
   * @param _signature Signature byte array associated with _hash
   *
   * MUST return the bytes4 magic value 0x1626ba7e when function passes.
   * MUST NOT modify state (using STATICCALL for solc < 0.5, view modifier for solc > 0.5)
   * MUST allow external calls
   */ 
  function isValidSignature(
    bytes32 _hash, 
    bytes memory _signature)
    public
    view 
    returns (bytes4 magicValue);
}

npm install @openzeppelin/contracts

import {IAccount, ACCOUNT_VALIDATION_SUCCESS_MAGIC} from "./interfaces/IAccount.sol";
import { SignatureChecker } from "@openzeppelin/contracts/utils/cryptography/SignatureChecker.sol";

contract MyAccount is IAccount {
    using SignatureChecker for address;

    function isValidSignature(
        address _address,
        bytes32 _hash,
        bytes memory _signature
    ) public pure returns (bool) {
        return _address.isValidSignatureNow(_hash, _signature);
    }
}

export async function isMessageSignatureCorrect(address: string, message: ethers.Bytes | string, signature: SignatureLike): Promise<boolean>;

export async function isTypedDataSignatureCorrect(
  address: string,
  domain: TypedDataDomain,
  types: Record<string, Array<TypedDataField>>,
  value: Record<string, any>,
  signature: SignatureLike
): Promise<boolean>;