Hello Mark,
Various things to consider here: maybe the first one is that I am not an expert in encryption/decryption. Maybe we can try to use the Cordova plugin that you mentioned, however, what about to use a JavaScript library like CryptoJS?
You can try it by downloading the latest release from here: https://github.com/brix/crypto-js/releases. Once download, look for a "crypto-js.js" file, which is what you must include in the app using the Files manager. Once you do that, the below code can be run and apparently works like a charm:
Maybe it's enough to use the referred library? On the other hand, what is the purpose of the encryption / decryption? For example, thinking to send some data over HTTP, the best is probably to use HTTPS instead, so we no need to encrypt / decrypt.
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