3box/lib/3id/utils.js

Interact with user data

"use strict";

var nacl = require('tweetnacl');

nacl.util = require('tweetnacl-util');

var randomNonce = function randomNonce() {
  return nacl.randomBytes(24);
};

var symEncryptBase = function symEncryptBase(msg, symKey, nonce) {
  nonce = nonce || randomNonce();

  if (typeof msg === 'string') {
    msg = nacl.util.decodeUTF8(msg);
  }

  var ciphertext = nacl.secretbox(msg, nonce, symKey);
  return {
    nonce: nacl.util.encodeBase64(nonce),
    ciphertext: nacl.util.encodeBase64(ciphertext)
  };
};

var symDecryptBase = function symDecryptBase(ciphertext, symKey, nonce, toBuffer) {
  ciphertext = nacl.util.decodeBase64(ciphertext);
  nonce = nacl.util.decodeBase64(nonce);
  var cleartext = nacl.secretbox.open(ciphertext, nonce, symKey);

  if (toBuffer) {
    return cleartext ? Buffer.from(cleartext) : null;
  }

  return cleartext ? nacl.util.encodeUTF8(cleartext) : null;
};

var newSymKey = function newSymKey() {
  return nacl.randomBytes(32);
};

module.exports = {
  randomNonce: randomNonce,
  symEncryptBase: symEncryptBase,
  symDecryptBase: symDecryptBase,
  newSymKey: newSymKey
};