I have a Google Spreadsheet and would like to encrypt the content of a few cells (I do not care which encryption method is being used as long as there is an equivalent decryption method for iOS).
Unfortunately there are no built-in encryption functions in Google Apps Script.
For this reason I would like to use a open source Javascript library like Crypto-JS and sjcl.
How can I use one of these libraries with Google Apps Script?
In the Google Apps Script documentation, I have not found any clue on how to use external JavaScript libraries with my Google Apps Script.