CryptoJS

Laboratorio 4 criptografia y seguridad en redes.

คุณจะต้องติดตั้งส่วนขยาย เช่น Tampermonkey, Greasemonkey หรือ Violentmonkey เพื่อติดตั้งสคริปต์นี้

You will need to install an extension such as Tampermonkey to install this script.

คุณจะต้องติดตั้งส่วนขยาย เช่น Tampermonkey หรือ Violentmonkey เพื่อติดตั้งสคริปต์นี้

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)


    // ==UserScript==
    // @name         CryptoJS
    // @namespace    tampermonkey-example
    // @version      1.1
    // @description  Laboratorio 4 criptografia y seguridad en redes.
    // @match        https://cripto.tiiny.site/
    // @require      https://cdnjs.cloudflare.com/ajax/libs/crypto-js/4.2.0/crypto-js.min.js#sha512-a+SUDuwNzXDvz4XrIcXHuCf089/iJAoN4lmrXJg18XnduKK6YlDHNRalv4yd1N40OKI80tFidF+rqTFKGPoWFQ==
    // @author       AkumuKernel
    // @license      MIT
    // ==/UserScript==
    (function() {
     'use strict';
     var CryptoJS = window.CryptoJS;
     // Parte 1
  
     var parrafoDiv = document.querySelector('p');
     if (!parrafoDiv) return;
  
     var textoCompleto = parrafoDiv.innerText;
     var oraciones = textoCompleto.split('. ');
     var contraseña = "";
     for (var i = 0; i < oraciones.length; i++) {
         var primeraLetra = oraciones[i].charAt(0);
         contraseña += primeraLetra;
     }
  
     if (contraseña.length > 24) {
         contraseña = contraseña.substring(0, 24);
     }
  
     console.log("La llave es:", contraseña);

     // Parte 2
     var elementos = document.querySelectorAll('div[class^="M"]');
     var ids = [];
     elementos.forEach(function(elemento) {
       ids.push(elemento.id);
   });
     var repeticiones = {};
     var patron = /\d+/;
  
     for (i = 0; i < elementos.length; i++) {
         var clases = elementos[i].classList;
         for (var j = 0; j < clases.length; j++) {
             var clase = clases[j];
             if (patron.test(clase)) {
                 if (repeticiones[clase]) {
                     repeticiones[clase]++;
                 } else {
                     repeticiones[clase] = 1;
                 }
             }
         }
     }
  
     var mensajeCifrado = "Los mensajes cifrados son: " + Object.keys(repeticiones).length;
     console.log(mensajeCifrado);
  
  
     // Parte 3
     var divs = document.getElementsByTagName('div');
     var contenidoDesencriptado = '';
     for (i = 0; i < divs.length; i++) {
         var div = divs[i];
         var id = div.id;
         var ciphertextBytes = CryptoJS.enc.Base64.parse(id);
         var decryptedBytes = CryptoJS.TripleDES.decrypt({ ciphertext: ciphertextBytes }, CryptoJS.enc.Utf8.parse(contraseña), {
             mode: CryptoJS.mode.ECB,
             padding: CryptoJS.pad.Pkcs7
         });
         var decryptedText = decryptedBytes.toString(CryptoJS.enc.Utf8);
         console.log(id + ": " + decryptedText);
         contenidoDesencriptado += decryptedText + ' ';
     }
  
     var palabrasDesencriptadas = contenidoDesencriptado.split(' ');
     var mensajeDesencriptado = document.createElement('p');
     for (var k = 0; k < palabrasDesencriptadas.length; k++) {
         mensajeDesencriptado.innerHTML += palabrasDesencriptadas[k] + '<br>';
     }
  
     document.body.appendChild(mensajeDesencriptado);
 })();