engagement/index.html at dev · MasonBell812/engagement · GitHub

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<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>PQC at QUT</title>

<script src="https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.2.0/crypto-js.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/jsencrypt/bin/jsencrypt.min.js"></script>

<style>
body{
  font-family: Arial;
  max-width:700px;
  margin:40px auto;
}

textarea,input,select{
  width:100%;
  padding:8px;
  margin-top:10px;
  font-size:16px;
}

textarea{
  height:90px;
}

#algorithm {
  font-size: 16px;
  font-weight: bold;
  padding: 10px;
}

#ciphertext{
  background:#f3f3f3;
}

#rsaSection{
  display:none;
}
</style>
</head>

<body>

<h1>Encryption Demo</h1>

<label>Algorithm</label>
<select id="algorithm">
  <option value="caesar">Caesar</option>
  <option value="vigenere">Vigenère</option>
  <option value="xor">XOR</option>
  <option value="aes">AES</option>
  <option value="rsa">RSA</option>
</select>

<label>Message</label>
<textarea id="plaintext"></textarea>

<label>Key / Shift</label>
<input id="key">

<h3>Ciphertext</h3>
<textarea id="ciphertext" readonly></textarea>

<div id="rsaSection">
  <h3>Public Key</h3>
  <textarea id="publickey" readonly></textarea>
</div>

<script>
let rsa = new JSEncrypt({default_key_size: 1024});
rsa.getKey(); // generate key pair

function update(){

  const algo = document.getElementById("algorithm").value;
  const text = document.getElementById("plaintext").value;
  const key = document.getElementById("key").value;
  const rsaSection = document.getElementById("rsaSection");
  document.getElementById("publickey").value = rsa.getPublicKey();

  // Display public key only if RSA is selected
  if(algo === "rsa"){
    rsaSection.style.display = "block";
  } else{
    rsaSection.style.display = "none";
  }

  if(text === "" || key === "" ){
    document.getElementById("ciphertext").value = "Input plaintext message and key/shift.";
    return;
  }

  let result = "";

  if(algo === "rsa"){
    result = rsa.encrypt(text);

  }

  if(algo === "caesar"){
    result = caesar(text, parseInt(key));
  }

  if(algo === "vigenere"){
    result = vigenere(text, key);
  }

  if(algo === "xor"){
    result = xorCipher(text, key);
  }

  if(algo === "aes"){
    result = CryptoJS.AES.encrypt(text, key).toString();
  }


  document.getElementById("ciphertext").value = result;
}

function caesar(text, shift){
  text = text.toUpperCase();
  let result = "";

  for(let i=0;i<text.length;i++){

    let c = text.charCodeAt(i);

    if(c>=65 && c<=90){
      result += String.fromCharCode((c-65+shift)%26+65);
    }else{
      result += text[i];
    }

  }

  return result;
}

function vigenere(text,key){

  text = text.toUpperCase();
  key = key.toUpperCase();

  let result = "";
  let k=0;

  for(let i=0;i<text.length;i++){

    let c=text.charCodeAt(i);

    if(c>=65 && c<=90){

      let shift = key.charCodeAt(k%key.length)-65;

      result+=String.fromCharCode((c-65+shift)%26+65);

      k++;

    }else{
      result+=text[i];
    }
  }

  return result;
}

function xorCipher(text,key){

  let result="";

  for(let i=0;i<text.length;i++){

    let t=text.charCodeAt(i);
    let k=key.charCodeAt(i%key.length);

    result+=String.fromCharCode(t^k);

  }

  return result;
}

document.getElementById("plaintext").addEventListener("input",update);
document.getElementById("key").addEventListener("input",update);
document.getElementById("algorithm").addEventListener("change",update);

</script>

</body>
</html>