Create cryptographic signatures for files and verify them.
This is based on signify, the OpenBSD tool to sign and verify signatures on files. It is based on the Ed25519 public-key signature system by Bernstein et al.
libsignify can verify and create signatures that are interoperable with BSD signify.
You can read more about the ideas and concepts behind signify in Securing OpenBSD From Us To You.
This crate is #![no_std] by default, but still relies on liballoc so your platform must
provide an allocator to use libsignify.
To enable support for std::error::Error, enable the std feature.