CreateToken creates a JWT token with the specified TTL (time to live), payload, and RSA private key.

Decrypt decrypts a base64 URL encoded AES-GCM encrypted string.

DecryptFile decrypts a base64 URL encoded AES-GCM encrypted file and writes the result to a new file.

Encrypt encrypts a string using AES-GCM with a key derived from keyString.

EncryptFile encrypts the contents of a file using AES-GCM and writes the result to a new file.

HashPassword generates a bcrypt hash of the given password.

SaveUploadedFile saves an uploaded file to a specified destination.

ValidToken checks the validity of the token and returns the subject of the token if it is valid.

VerifyPassword - password verification.