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