Signing Complete

[vivekteega]

No description provided.

[vivekteega]

Pulling Tanishk changes into branch "standard-operations" for further revision

The sign_message functions now verifies with standard operations.
Things to note:
The function now takes 2 parameters -

Message in string ( not hex-encoded string)
Private key in wif (not bytes etc.)
the hex parameter has been removed as we are always returning hex in standard ops
New libraries used - hashlib
The elliptical curve folder, holds the code taken from starkbank ecdsa (MIT License)
no other additional dependencies