Package enc provides a simple interface for encrypting and decrypting data to a useful format.

First, the data item is encoded to as a gob. Next, the encoding is compressed to the gzip format. This is encrypted with AES-256 in Galois/Counter mode. The input password is derived with argon2i and the hash is used as the key to AES. The output data is in the following format.

[enc version][argon2 salt][AES nonce][encrypted data]

This format aims for minimal data size (from gzip), data integrity (from GCM), and data confidentiality (from AES).