crypto: clean-up impossible errors from blake2b
and PublicKeyWithHash
#63
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Since we're doing the spring clean-up in #62, might as well do this.
This PR removes impossible errors from return types in
blake2b_*
functions with fixed hash size,merkle_tree
, and conversion from public key to public key hashes.Doesn't touchPublicKeyWithHash
interface, which includes anError
, now essentially unused, in the interest of compatibility.