Commits on Jun 6, 2019

1. Have DigestSigner/DigestVerifier take Digest instance …

   This is needed forcompatibility with ed25519-dalek's Ed25519ph:
   
   https://docs.rs/ed25519-dalek/1.0.0-pre.1/ed25519_dalek/struct.Keypair.html#method.sign_prehashed
   
   Until const generics land, this API feels a lot cleaner to me. It gets
   all the `GenericArray` crap out of the way.
   
   It's also misuse resistant in that it ensures the prehashing is done by
   the relevant hash function, as opposed to the user being able to pass in
   arbitrary values. There's a potential attack if a verifier accidentally
   accepts a raw value which isn't the output of a hash function which
   could allow an attacker to forge signatures:
   
   https://twitter.com/pwuille/status/1063582706288586752

   

   tarcieri committed Jun 6, 2019
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