Trait impl’d by concrete types that represent digital signatures.
Signature types must (as mandated by the
AsRef<[u8]> bound) be a thin
wrapper around the “bag-of-bytes” serialized form of a signature which can
be directly parsed from or written to the “wire”.
Inspiration for this approach comes from the Ed25519 signature system, which adopted it based on the observation that past signature systems were not prescriptive about how signatures should be represented on-the-wire, and that lead to a proliferation of different wire formats and confusion about which ones should be used.
Signature trait aims to provide similar simplicity by minimizing
the number of steps involved to obtain a serializable signature and
ideally ensuring there is one signature type for any given signature system
shared by all “provider” crates.
For signature systems which require a more advanced internal representation
(e.g. involving decoded scalars or decompressed elliptic curve points) it’s
recommended that “provider” libraries maintain their own internal signature
type and use
From bounds to provide automatic conversions.
Parse a signature from its byte representation
Borrow a byte slice representing the serialized form of this signature