/// The AESNI instructions implement a little-endian version of AES, but
/// Catacomb's internal interface presents as big-endian so as to work better
/// with things like GCM. We therefore maintain the round keys in
/// The AESNI instructions implement a little-endian version of AES, but
/// Catacomb's internal interface presents as big-endian so as to work better
/// with things like GCM. We therefore maintain the round keys in