Decrypt decrypts data using 256-bit AES-GCM. This both hides the content of
the data and provides a check that it hasn't been altered. Expects input
form nonce|ciphertext|tag where '|' indicates concatenation.
Encrypt encrypts data using 256-bit AES-GCM. This both hides the content of
the data and provides a check that it hasn't been altered. Output takes the
form nonce|ciphertext|tag where '|' indicates concatenation.