Derive Macro signature_derive::Signer

#[derive(Signer)]

Derive the [Signer] trait for a type which impls DigestSigner.

When implementing the DigestSigner trait for a signature type which itself impl’s the PrehashSignature trait (which marks signature algorithms which are computed using a Digest), signature providers can automatically derive the [Signer] trait when the digest algorithm is PrehashSignature::Digest (i.e. the “standard” digest algorithm for a given signature type)

This automates all of the digest computation otherwise needed for a complete signature algorithm implementation.