package engine

import (
	"crypto/ecdh"
	"crypto/rand"
	"fmt"
)

type Engine struct {
	curve ecdh.Curve
}

func NewEngine() *Engine {
	return &Engine{
		curve: ecdh.X25519(),
	}
}

func (e *Engine) GenerateKeyPair() (*KeyPair, error) {
	priv, err := e.curve.GenerateKey(rand.Reader)
	if err != nil {
		return nil, fmt.Errorf("failed to generate private key: %w", err)
	}
	return &KeyPair{
		PrivateKey: priv,
		PublicKey:  priv.PublicKey(),
	}, nil
}