Web Encrypt API (Encrypt)

(async () => {
	let ciphertext;
	let counter;
  
    const message = "esto es prueba";
	let enc = new TextEncoder();
	let encoded = enc.encode(message);
  const key = await window.crypto.subtle.generateKey(
    {
        name: "AES-CTR",
        length: 256
    },
    true,
    ["encrypt", "decrypt"]
  );
    
	counter = window.crypto.getRandomValues(new Uint8Array(16));
  
	ciphertext = await window.crypto.subtle.encrypt(
    {
      name: "AES-CTR",
      counter,
      length: 64
    },
    key,
    encoded
  );
})();

(async () => {
  let ciphertext;
  let iv;
  
  const message = "esto es prueba";
  let enc = new TextEncoder();
  const key = await window.crypto.subtle.generateKey(
    {
        name: "AES-GCM",
        length: 256,
    },
    true,
    ["encrypt", "decrypt"]
  );
  
  
  let encoded = enc.encode(message);
  iv = window.crypto.getRandomValues(new Uint8Array(12));
  ciphertext = await window.crypto.subtle.encrypt(
    {
      name: "AES-GCM",
      iv: iv
    },
    key,
    encoded
  );
})();

(async () => {
  let ciphertext;
  let iv;

  const message = "esto es prueba";
  let enc = new TextEncoder();
  const key = await window.crypto.subtle.generateKey(
    {
        name: "AES-CBC",
        length: 256
    },
    true,
    ["encrypt", "decrypt"]
  );

  let encoded = enc.encode(message);

  iv = window.crypto.getRandomValues(new Uint8Array(16));
  ciphertext = await window.crypto.subtle.encrypt(
    {
      name: "AES-CBC",
      iv
    },
    key,
    encoded
  );
})();