> Node-JS code to generate header:

[pawan2004may]

Node-JS code to generate header:

You're using an external library. Why? Node has native libraries for this. And all this array magic can be abstracted away using Buffers:

function encrypt({password, publicKey, publicKeyId}) {
    const time = Date.now().toString();
    const key = crypto.pseudoRandomBytes(32);
    const iv = Buffer.alloc(12, 0);
    const cipher = crypto.createCipheriv('aes-256-gcm', key, iv).setAAD(Buffer.from(time));
    const aesEncrypted = Buffer.concat([cipher.update(Buffer.from(password)), cipher.final()]);
    const authTag = cipher.getAuthTag();
    const encryptedKey = seal(key, Buffer.from(publicKey, 'hex'));
    return {
      encrypted: Buffer.concat([
        Buffer.from([
          1,
          Number(publicKeyId),
          encryptedKey.byteLength & 255,
          (encryptedKey.byteLength >> 8) & 255,
        ]),
        encryptedKey,
        authTag,
        aesEncrypted,
      ]).toString('base64'),
      time,
    };
  }
function generateEncPassword({password, publicKey, publicKeyId, encryptionVersion}) {
  const  { encrypted, time } = encrypt({password, publicKey, publicKeyId});
  return `#PWD_INSTAGRAM_BROWSER:${encryptionVersion}:${time}:${encrypted}`;
}

seal() is a function from tweetnacl-sealed-box.

Originally posted by @Nerixyz in #140 (comment)