Encrypt and decrypt buffers in nodejs

crypto-buffer.js

// Part of https://github.com/chris-rock/node-crypto-examples

var crypto = require('crypto'),
    algorithm = 'aes-256-ctr',
    password = 'd6F3Efeq';

function encrypt(buffer){
  var cipher = crypto.createCipher(algorithm,password)
  var crypted = Buffer.concat([cipher.update(buffer),cipher.final()]);
  return crypted;
}
 
function decrypt(buffer){
  var decipher = crypto.createDecipher(algorithm,password)
  var dec = Buffer.concat([decipher.update(buffer) , decipher.final()]);
  return dec;
}
 
var hw = encrypt(new Buffer("hello world", "utf8"))
// outputs hello world
console.log(decrypt(hw).toString('utf8'));

Yes, I download encrypted buffer with a rest api like content-type application/pdf and attachments headers. What I'm looking for is to protect the pdf with a password, so I can open it only with this password.

@hdiaz-nectia That's totally out of the scope of this example, sorry. Anything encrypted with this method would have to be decrypted the same way. You'd be better of archiving the pdf & using any kind of password protection that archive gives you. Or maybe PDF has some built-in password protection?

Thanks!!

Yes, I download encrypted buffer with a rest api like content-type application/pdf and attachments headers. What I'm looking for is to protect the pdf with a password, so I can open it only with this password.

@hdiaz-nectia Have you got the solution for this case? I wanted to implement this same case