add es256k (secp256k1 curve) support #643
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Fix #222
I'm using
github.com/decred/dcrd/dcrec/secp256k1/v4
which is go-native implementation for secp256k1 curve.My first attempt to add the support into current code. Not super clean so looking for feedbacks to fit better into the current design.
Feel free to contribute into this PR as needed. I will try to find time to update as feedbacks coming in and complete the TODO.
TODO:
step crypto key sign
andstep crypto key verify
step crypto keypair
Example: