You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: ethschnorr.go
    path of file: ./repos/chainlink/core/services/signatures/ethschnorr
    
    the code of the file until where you have to start completion: // Package ethschnorr implements a version of the Schnorr signature which is
// //////////////////////////////////////////////////////////////////////////////
//
//	XXX: Do not use in production until this code has been audited.
//
// //////////////////////////////////////////////////////////////////////////////
// cheap to verify on-chain.
//
// See https://en.wikipedia.org/wiki/Schnorr_signature For vanilla Schnorr.
//
// Since we are targeting ethereum specifically, there is no need to abstract
// away the group operations, as original kyber Schnorr code does. Thus, these
// functions only work with secp256k1 objects, even though they are expressed in
// terms of the abstract kyber Group interfaces.
//
// This code is largely based on EPFL-DEDIS's go.dedis.ch/kyber/sign/schnorr
package ethschnorr

import (
	"b
    
func Verify(public kyber.Point, msg *big.Int, s Signature) error {
	var err error
	if !ValidSignature(s) {
		err = fmt.Errorf("s is not a valid signature")
	}
	if err == nil && !secp256k1.IsSecp256k1Point(public) {
		err = fmt.Errorf("public key is not a secp256k1 point")
	}
	if err == nil && !secp256k1.ValidPublicKey(public) {
		err = fmt.Errorf("`public` is not a valid public key")
	}
	if err == nil && (msg.Cmp(zero) == -1 || msg.Cmp(maxUint256) == 1) {
		err = fmt.Errorf("msg is not a uint256")
	}
	var challenge kyber.Scalar
	var herr error
	if err == nil {
		challenge, herr = ChallengeHash(public, s.CommitmentPublicAddress, msg)
		if herr != nil {
			err = herr
		}
	}
	if err != nil {
		return err
	}
	sigScalar := secp256k1.IntToScalar(s.Signature)
	// s*g + challenge*public = s*g + challenge*(secretKey*g) =
	// commitmentSecretKey*g = commitmentPublicKey
	maybeCommitmentPublicKey := secp256k1Group.Point().Add(
		secp256k1Group.Point().Mul(sigScalar, nil),
		secp256k1Group.Point().Mul(challenge, public))
	maybeCommitmentPublicAddress := secp256k1.EthereumAddress(maybeCommitmentPublicKey)
	if !bytes.Equal(s.CommitmentPublicAddress[:],
		maybeCommitmentPublicAddress[:]) {
		return fmt.Errorf("signature mismatch")
	}
	return nil
}