`reallyme-crypto-sha2` provides SHA-384 and SHA-512 digest wrappers for the
ReallyMe Crypto workspace. SHA-256 remains in `reallyme-crypto-sha2-256` so
callers that only need SHA-256 can keep a smaller dependency surface.
The crate owns fixed-size digest types, zeroizes digest buffers on drop, and
leaves algorithm dispatch, FFI, and platform package bindings to adapter
crates.
```sh
cargo test -p reallyme-crypto-sha2 --features native
```