𓂃🖊 Schnorr256

Introduction

This library provides functionality for Schnorr signature verification over any 256-bit curve.

Functions

To use the Schnorr256 library, you need to import it.

import "@solarity/solidity-lib/libs/crypto/Schnorr256.sol";

And optionally bind it to the type with the using statement.

using Schnorr256 for *;

verify

function verify(
    EC256.Curve memory ec,
    bytes32 hashedMessage_,
    bytes memory signature_,
    bytes memory pubKey_
) internal view returns (bool);

Description

The function to verify the Schnorr signature.

Parameters:

Name	Type	Description
ec	struct EC256.Curve	The 256-bit curve parameters
hashedMessage	bytes32	The already hashed message to be verified
signature	bytes	The Schnorr signature. Equals to bytes(R) + bytes(e)
pubKey	bytes	The full public key of a signer. Equals to bytes(x) + bytes(y)

Example

function verifySECP256k1(
    bytes32 hashedMessage_,
    bytes memory signature_,
    bytes memory pubKey_
) external view returns (bool isVerified_) {
    EC256.Curve memory _secp256k1CurveParams =
        EC256.Curve({
            a: 0x0000000000000000000000000000000000000000000000000000000000000000,
            b: 0x0000000000000000000000000000000000000000000000000000000000000007,
            gx: 0x79be667ef9dcbbac55a06295ce870b07029bfcdb2dce28d959f2815b16f81798,
            gy: 0x483ada7726a3c4655da4fbfc0e1108a8fd17b448a68554199c47d08ffb10d4b8,
            p: 0xfffffffffffffffffffffffffffffffffffffffffffffffffffffffefffffc2f,
            n: 0xfffffffffffffffffffffffffffffffebaaedce6af48a03bbfd25e8cd0364141
        });

    return _secp256k1CurveParams.verify(hashedMessage_, signature_, pubKey_);
}