godot-secp256k1

A godot proxy into the high-performance high-assurance C library for digital signatures and other cryptographic primitives on the secp256k1 elliptic curve.

NOTE: This currently only supports the Schnorr signature methods, and not the full secp256k1 library. The current state of the library was to support Nostr relay's in this repository: Feel free to contribute and expand the API surface.

Features

• Schnorr signatures according to BIP-340.

Installation

1. Copy everything under addons/ into your Godot project.

Usage

Example scenes are available under project/examples.

Schnorr signing

See projects/examples/schnorr.gd for further examples.

# Generate a new Secp256k1 instance
var _secp256k1 := Secp256k1.new()
# Generate the private / public keys. Returns the public key.
var pubkey = _secp256k1.get_public_key()

var message = "Sign me"
# NOTE: the parameter must be a sha256_buffer as schnorr signatures take in a 32 byte hash of the message text
var signed_bytes = _secp256k1.schnorr_sign(message.sha256_buffer())

# Verify an existing signature:
var err = _secp256k1.schnorrsig_verify(message.sha256_buffer(), signed_bytes.hex_decode())