replaceWith = ReplaceWith(expression = "peerCertificates"),
    level = DeprecationLevel.ERROR,
  )
  fun peerCertificates(): List<Certificate> = peerCertificates

  /** Returns the remote peer's principle, or null if that peer is anonymous. */
  @get:JvmName("peerPrincipal")
  val peerPrincipal: Principal?
    get() = (peerCertificates.firstOrNull() as? X509Certificate)?.subjectX500Principal