// Copyright (c) 2013-2014 Conformal Systems LLC.
// Use of this source code is governed by an ISC
// license that can be found in the LICENSE file.

package btcec

import (
	"crypto/ecdsa"
	"math/big"
)

// PrivKeyFromBytes returns a private and public key for `curve' based on the
// private key passed as an argument as a byte slice.
func PrivKeyFromBytes(curve *KoblitzCurve, pk []byte) (*ecdsa.PrivateKey,
	*PublicKey) {
	x, y := curve.ScalarBaseMult(pk)

	priv := &ecdsa.PrivateKey{
		PublicKey: ecdsa.PublicKey{
			Curve: curve,
			X:     x,
			Y:     y,
		},
		D: new(big.Int).SetBytes(pk),
	}

	return priv, (*PublicKey)(&priv.PublicKey)
}