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HTML

              
                <body>
  <div class="container">
    <div class="row justify-content-md-center">
      <div class="col">
        <h1>Verificador de Contraseñas Comprometidas</h1>
        <p>Verifica las contraseñas contra la base de datos de <a href="https://haveibeenpwned.com/Passwords" target="_blank">Have I Been Pwned's</a> que contiene la mayor colección de contraseñas reveladas por filtraciones de datos. </p>
      </div>

      <form action="#" onsubmit="return false;">
      <!--    only code needed    -->
      <div class="input-group mb-3">
        <label for="password" class="sr-only">Password</label>
        <input id="password" type="password" class="form-control" placeholder="Contraseña">
        <div class="input-group-append">
          <button class="btn btn-outline-secondary" type="button" id="checkpass">Verificá la Contraseña</button>
        </div>
      </div>

      <small class="form-text text-muted">La contraseña real no es enviada a un servidor externo, solamente los primeros 5 caracteres del hash encriptado.<br><br></small>
      </form>
    </div>

    <div id="alert" class="alert invisible" role="alert"></div>
  </div>
<p class="collection">
<a href="https://cibersergei.com/hacks-productividad/" target="_blank">CiberSergei Hacks <br>  de Productividad</a>
</p>

  
  
</body>
              
            
!

CSS

              
                
.collection {
  position: fixed;
  z-index: 1000;
  width: auto;
  bottom: 0;
  justify-content: right;
  right: 0;
  margin: 15px;
  padding: 0;
  font-family: 'Montserrat', sans-serif;
  font-size: 16px;
  
}

.collection a {
  display: inline-block;
  background: #000;
  opacity: 0.4;
  transition: opacity 0.7s;
  margin-left: 5px;
  padding: 5px;
  text-decoration: none;
  font-weight: bold;
  color: #fff;
}

.collection a:hover {
  opacity: 1;
}

              
            
!

JS

              
                async function sha1(message) {
  // encode as UTF-8
  const msgBuffer = new TextEncoder('utf-8').encode(message);

  // hash the message
  const hashBuffer = await crypto.subtle.digest('SHA-1', msgBuffer);

  // convert ArrayBuffer to Array
  const hashArray = Array.from(new Uint8Array(hashBuffer));

  // convert bytes to hex string
  const hashHex = hashArray.map(b => ('00' + b.toString(16)).slice(-2)).join('');
  return hashHex;
}


function checkPass() {
	var password = document.getElementById('password');
  var hashed;

	// update input with generated hash
	if (password.value !='') {
    sha1(password.value).then(function(hash) {
      hashed = hash.toUpperCase();

      // get the first few characters
      var first = hashed.substring(0, 5);
      // output remaining characters
      var last = hashed.substring(5);

      // make the request passing over the 5 chars
      apiRequest(first, function(output){
        var arr = output.split('\r\n');
        var count = 0;
        
        var alertBox = document.getElementById('alert');
        var alertDanger = 'No recomendado! La Contraseña fue encontrada en bases de datos comprometidas. Se contaron: ';
        var alertSuccess = 'Muy bien! La contraseña no fue encontrada en bases de datos comprometidas.';
        var alertWarning = 'Parece que algo dio errado. Intenta nuevamente.';

        
        arr.forEach(function(element) {
        	// match orig hash against return blob
          if(element.slice(0,35) == last.toString()) {
          	// get count after returned hashes format (hash:count)
            count = element.slice(36);
          }
        });

        // update alert with info about count
        alertBox.classList.remove("invisible");
        
        if (count > 0) {
          // found
          alertBox.classList.add("alert-danger");
	        alertBox.innerHTML = alertDanger + count + " casos.";
	      } else if (count == 0) {
          // not found
          alertBox.classList.remove("alert-danger");
          alertBox.classList.add("alert-success");
	        alertBox.innerHTML = alertSuccess;
        } else {
          // something went wrong
          alertBox.classList.remove("alert-danger");
          alertBox.classList.add("alert-warning");
	        alertBox.innerHTML = alertWarning;
        }
    	});
    });
  }
}

// GET method for cacheing HIBP API
function apiRequest(request, handleData) {
  var hibp_request = 'https://api.pwnedpasswords.com/range/' + request;
  var xhr = new XMLHttpRequest();
  xhr.open('GET', hibp_request);
  xhr.send(null);

  xhr.onreadystatechange = function () {
    var DONE = 4; // readyState 4 means the request is done.
    var OK = 200; // status 200 is a successful return.
    if (xhr.readyState === DONE) {
      if (xhr.status === OK) {
        // next steps
        handleData(xhr.responseText);
      } else {
        // An error occurred during the request.
        console.log('Error: ' + xhr.status);
      }
    }
  };
}

var checkPassBtn = document.getElementById('checkpass');
checkPassBtn.addEventListener('click', checkPass);

              
            
!
999px

Console