Signature entropy? #9
Description
In the readme, it's stated:
"Random data is required for key generation, but not for signing. All signatures are deterministic, based on the message and secret key."
The problem with this is, some of the signature operations accept additional entropy. I'd like to identify them and maybe offer an optional argument for accepting this entropy. The problem with this is that it alters the simplified interface for this, and leads to additional development decisions for "modified BIP-32" (BIP-32 sans xpub).