ecdsa: extract hazmat::{sign_prehashed, verify_prehashed}
#731
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Extracts generic, reusable functions from the
SignPrimitive
andVerifyPrimitive
traits.The main motivation for this is to make it possible for the
*Primitive
trait impls to be composed in terms of a generic implementation, in order to add support for low-S normalization in thek256
crate.