.serialNumber(2L)
        .certificateAuthority(1)
        .signedBy(root)
        .build()
    val certB =
      HeldCertificate.Builder()
        .serialNumber(3L)
        .certificateAuthority(0)
        .signedBy(certA)
        .build()
    val certC =
      HeldCertificate.Builder()
        .serialNumber(4L)
        .signedBy(certB)
        .build()
    val cleaner = get(root.certificate)

    }

    /**
     * Set the certificate that will issue this certificate. If unset the certificate will be
     * self-signed.
     */
    fun signedBy(signedBy: HeldCertificate?) =
      apply {
        this.signedBy = signedBy
      }

    /**
     * Set this certificate to be a signing certificate, with up to `maxIntermediateCas`
     * intermediate signing certificates beneath it.

        .commonName("root")
        .build()
    val intermediateCa =
      HeldCertificate.Builder()
        .signedBy(rootCa)
        .certificateAuthority(0)
        .serialNumber(2L)
        .commonName("intermediate_ca")
        .build()
    val certificate =
      HeldCertificate.Builder()
        .signedBy(intermediateCa)
        .serialNumber(3L)
        .commonName(server.hostName)
        .build()

        .certificateAuthority(1)
        .build()
    val clientIntermediate =
      HeldCertificate.Builder()
        .certificateAuthority(0)
        .signedBy(clientRoot)
        .build()
    val clientCertificate =
      HeldCertificate.Builder()
        .signedBy(clientIntermediate)
        .build()
    val serverRoot =
      HeldCertificate.Builder()
        .certificateAuthority(1)
        .build()

    .build();

HeldCertificate intermediateCertificate = new HeldCertificate.Builder()
    .certificateAuthority(0)
    .signedBy(rootCertificate)
    .build();

HeldCertificate serverCertificate = new HeldCertificate.Builder()
    .addSubjectAlternativeName("localhost")
    .signedBy(intermediateCertificate)
    .build();
```

To serve this configuration the server needs to provide its clients with a chain of certificates

        .build()
    serverIntermediateCa =
      HeldCertificate.Builder()
        .signedBy(serverRootCa)
        .certificateAuthority(0)
        .serialNumber(2L)
        .commonName("intermediate_ca")
        .addSubjectAlternativeName("intermediate_ca.com")
        .build()
    serverCert =
      HeldCertificate.Builder()
        .signedBy(serverIntermediateCa)
        .serialNumber(3L)
        .commonName("Local Host")

      .certificateAuthority(1)
      .build()
  val serverIntermediate =
    HeldCertificate.Builder()
      .certificateAuthority(0)
      .signedBy(serverRoot)
      .build()
  val serverCertificate =
    HeldCertificate.Builder()
      .signedBy(serverIntermediate)
      .build()

  @Test
  fun createFromParts() {
    val handshake =
      Handshake.get(
        tlsVersion = TlsVersion.TLS_1_3,

        .certificateAuthority(0)
        .rsa2048()
        .build()
    val leaf =
      HeldCertificate.Builder()
        .certificateAuthority(0)
        .ecdsa256()
        .signedBy(root)
        .build()
    assertThat(root.certificate.sigAlgName).isEqualTo("SHA256WITHRSA", ignoreCase = true)
    assertThat(leaf.certificate.sigAlgName).isEqualTo("SHA256WITHRSA", ignoreCase = true)
  }

    val root =
      HeldCertificate.Builder()
        .certificateAuthority(0)
        .rsa2048()
        .build()
    val certificate =
      HeldCertificate.Builder()
        .signedBy(root)
        .rsa2048()
        .build()

    val certificateByteString = certificate.certificate.encoded.toByteString()

    // Valid signature.
    val okHttpCertificate =

        .build()
    val serverCa =
      HeldCertificate.Builder()
        .certificateAuthority(0)
        .build()
    val serverCertificate =
      HeldCertificate.Builder()
        .signedBy(serverCa)
        .addSubjectAlternativeName(server.hostName)
        .build()
    val serverHandshakeCertificates =
      HandshakeCertificates.Builder()
        .addTrustedCertificate(clientCa.certificate)