Function signatory::verify_sha256

pub fn verify_sha256<S>(
    verifier: &dyn Sha256Verifier<S>, 
    msg: &[u8], 
    signature: &S
) -> Result<(), Error> where
    S: Signature, 

Verify SHA-256 of the given message and then sign the resulting digest. This can be used to avoid importing the Verifier and Signature traits