ethereum.go

/*

 */

package hdwallet

import (
	"crypto/elliptic"
	"github.com/btcsuite/btcd/btcec"
)

func (w *Wallet) GetETHKeyPair(i uint32) (*btcec.PrivateKey, *btcec.PublicKey, error) {
	key, err := w.ethPrivKey(i)
	if err != nil {
		return nil, nil, err
	}

	privKey, pubkey := btcec.PrivKeyFromBytes(elliptic.P256(), key.key)
	return privKey, pubkey, nil
}

func (w *Wallet) ethPrivKey(i uint32) (*ExtendedKey, error) {

	gen := &Secp256K1{}

	master := MasterKeyGenerate(w.Seed, Secp256k1CurvePhrase)

	purposeKey, err := gen.Child(*master, hardenIndex(purposeBIP44))
	if err != nil {
		return nil, err
	}

	btcKey, err := gen.Child(*purposeKey, hardenIndex(coinTypeETH))
	if err != nil {
		return nil, err
	}

	accountKey, err := gen.Child(*btcKey, hardenIndex(0))
	if err != nil {
		return nil, err
	}

	changeKey, err := gen.Child(*accountKey, uint32(externalChain))
	if err != nil {
		return nil, err
	}

	indexKey, err := gen.Child(*changeKey, i)
	if err != nil {
		return nil, err
	}

	return indexKey, nil
}