signer.go

// Package signer holds EOA private keys to can sign regular Ethereum transactions.
package signer

import (
	"crypto/ecdsa"
	"errors"

	"github.com/ethereum/go-ethereum/common"
	"github.com/ethereum/go-ethereum/crypto"
)

// EOA is an instance of a ECDSA private key, public key, and address.
type EOA struct {
	PrivateKey *ecdsa.PrivateKey
	PublicKey  *ecdsa.PublicKey
	Address    common.Address
}

// New returns an EOA from a hex string of a ECDSA private key.
func New(pk string) (*EOA, error) {
	privateKey, err := crypto.HexToECDSA(pk)
	if err != nil {
		return nil, err
	}
	publicKey, ok := privateKey.Public().(*ecdsa.PublicKey)
	if !ok {
		return nil, errors.New("cannot assert type: publicKey is not of type *ecdsa.PublicKey")
	}
	address := crypto.PubkeyToAddress(*publicKey)

	return &EOA{
		PrivateKey: privateKey,
		PublicKey:  publicKey,
		Address:    address,
	}, nil
}