function reboot() {
  var msg = document.querySelector('#pwd1').value;
alert(msg);
  digestMsg(msg).then(result=>{
    var opt = document.querySelector('[name="opt"]');
    var chk = document.querySelector('[name="chk1"]');
    opt.value = 3;
    chk.value = digToHex(result);
//    document.querySelector('form').submit();

console.log(opt.value);
console.log(chk.value);

  });
//  form.submit();
}

function digToHex(buf) {
  const bytes = new Uint8Array(buf);
  const hexCodes = [...bytes].map(value => {
    const hexCode = value.toString(16);
    const padHexCode = hexCode.padStart(2, '0');
    return padHexCode;
  });
  return hexCodes.join('');
}

function digestMsg(msg) {
  const enc = new TextEncoder();
  const data = enc.encode(msg);
  return window.crypto.subtle.digest('SHA-1', data);
}