verify.go

// Verify verifies that a byte slice was signed by a given public key.
func Verify(publicKey *ecdsa.PublicKey, signature, data []byte) (bool, error) {
	hasher := sha3.New256()
	_, err := hasher.Write(data)
	if err != nil {
		return false, err
	}

	pluginHash := hasher.Sum(nil)
	r := new(big.Int).SetBytes(signature[0:32])
	s := new(big.Int).SetBytes(signature[32:64])
	return ecdsa.Verify(publicKey, pluginHash, r, s), nil
}