internal data class PrivateKeyInfo(
  // v1(0), v2(1).
  val version: Long,
  val algorithmIdentifier: AlgorithmIdentifier,
  val privateKey: ByteString,
) {
  // Avoid Long.hashCode(long) which isn't available on Android 5.
  override fun hashCode(): Int {
    var result = 0
    result = 31 * result + version.toInt()
    result = 31 * result + algorithmIdentifier.hashCode()
    result = 31 * result + privateKey.hashCode()
    return result

		privKey.Algo = pkix.AlgorithmIdentifier{
			Algorithm: oidPublicKeyEd25519,
		}
		curvePrivateKey, err := asn1.Marshal(k.Seed())
		if err != nil {
			return nil, fmt.Errorf("x509: failed to marshal private key: %v", err)
		}
		privKey.PrivateKey = curvePrivateKey

	case *ecdh.PrivateKey:
		if k.Curve() == ecdh.X25519() {
			privKey.Algo = pkix.AlgorithmIdentifier{
				Algorithm: oidPublicKeyX25519,

package pkix

import (
	"encoding/asn1"
	"encoding/hex"
	"fmt"
	"math/big"
	"time"
)

// AlgorithmIdentifier represents the ASN.1 structure of the same name. See RFC
// 5280, section 4.1.1.2.
type AlgorithmIdentifier struct {
	Algorithm  asn1.ObjectIdentifier
	Parameters asn1.RawValue `asn1:"optional"`
}

type RDNSequence []RelativeDistinguishedNameSET