/// Encrypted random-access file I/O built on top of the AEGIS ciphers.
/// AEGIS-128L.
/// AEGIS-128X2, the 2-lane variant of AEGIS-128L.
/// AEGIS-128X4, the 4-lane variant of AEGIS-128L.
/// AEGIS-256.
/// AEGIS-256X2, the 2-lane variant of AEGIS-256.
/// AEGIS-256X4, the 4-lane variant of AEGIS-256.