* ```
 *
 * In this example the HTTP client already knows and trusts the last certificate, "Entrust Root
 * Certification Authority - G2". That certificate is used to verify the signature of the
 * intermediate certificate, "Entrust Certification Authority - L1M". The intermediate certificate
 * is used to verify the signature of the "www.squareup.com" certificate.
 *

    NVOFBkpdn627G190
    -----END CERTIFICATE-----
    """.trimIndent().decodeCertificatePem()

  // CN=Entrust Root Certification Authority, OU="(c) 2006 Entrust, Inc.", OU=www.entrust.net/CPS is incorporated by reference, O="Entrust, Inc.", C=US
  val entrustRootCertificateAuthority =
    """
    -----BEGIN CERTIFICATE-----
    MIIEkTCCA3mgAwIBAgIERWtQVDANBgkqhkiG9w0BAQUFADCBsDELMAkGA1UEBhMC

                  AttributeTypeAndValue(
                    type = organizationName,
                    value = "Entrust, Inc.",
                  ),
                ),
                listOf(
                  AttributeTypeAndValue(
                    type = ORGANIZATIONAL_UNIT_NAME,
                    value = "www.entrust.net/CPS is incorporated by reference",
                  ),
                ),
                listOf(

        "DigiCert",
        "Let's Encrypt",
        "ISRG", // Internet Security Research Group (Let's Encrypt parent)
        "GlobalSign",
        "Comodo",
        "Sectigo",
        "GeoTrust",
        "Entrust",
      )
    assertThat(names).matchesPredicate { strings ->
      strings.any { name -> majorIssuers.any { issuer -> name.contains(issuer, ignoreCase = true) } }
    }
  }

MockWebServer server = new MockWebServer();
server.useHttps(serverCertificates.sslSocketFactory(), false);
```

`HandshakeCertificates` also works for clients where its job is to define which root certificates
to trust. In this simplified example we trust the server's self-signed certificate:

```java
HandshakeCertificates clientCertificates = new HandshakeCertificates.Builder()
    .addTrustedCertificate(localhostCertificate.certificate())
    .build();

    assertThat(actual).isNotNull()
  }

  private fun enableTls() {
    // Generate a self-signed cert for the server to serve and the client to trust.
    // can't use TlsUtil.localhost with a non OpenJSSE trust manager
    val heldCertificate =
      HeldCertificate
        .Builder()
        .commonName("localhost")
        .addSubjectAlternativeName("localhost")
        .build()

object TlsUtil {
  val password = "password".toCharArray()

  private val localhost: HandshakeCertificates by lazy {
    // Generate a self-signed cert for the server to serve and the client to trust.
    val heldCertificate =
      HeldCertificate
        .Builder()
        .commonName("localhost")
        .addSubjectAlternativeName("localhost")
        .addSubjectAlternativeName("localhost.localdomain")

  private val sslExcludeFilter =
    Regex(
      buildString {
        append("^(?:")
        append(
          listOf(
            "Inaccessible trust store",
            "trustStore is",
            "Reload the trust store",
            "Reload trust certs",
            "Reloaded",
            "adding as trusted certificates",
            "Ignore disabled cipher suite",
            "Ignore unsupported cipher suite",

    level: Int,
    t: Throwable?,
  ) {
    if (level == WARN) {
      Log.w(Tag, message, t)
    } else {
      Log.i(Tag, message, t)
    }
  }

  /**
   * A trust manager for Android applications that customize the trust manager.
   *
   * This class exploits knowledge of Android implementation details. This class is potentially

import okhttp3.internal.toImmutableList
import okhttp3.tls.internal.TlsUtil.newKeyManager
import okhttp3.tls.internal.TlsUtil.newTrustManager

/**
 * Certificates to identify which peers to trust and also to earn the trust of those peers in kind.
 * Client and server exchange these certificates during the handshake phase of a TLS connection.
 *
 * ### Server Authentication
 *