[padraigk]

Nice util. Just a suggestion for the encryption: You should consider using a password-based key derivation function (PBKDF) rather than just hashing the key once with SHA256. This could help deter brute-force attacks particularly if the chosen hashing function is computationally intensive; e.g. scrypt

[maebert]

You're absolutely right, and honestly I have no idea why I used SHA256, I should know better. Will fix.