}

	cert, ok := clientKey.(*ssh.Certificate)
	if !ok {
		return errSftpPublicKeyWithoutCert
	}

	// ssh.CheckCert called by ssh.Authenticate accepts certificates
	// with empty principles list so we block those in here.
	if len(cert.ValidPrincipals) == 0 {
		return errSftpCertWithoutPrincipals
	}

	// Verify that certificate provided by user is issued by trusted CA,

hmac-sha2-512
hmac-sha1
hmac-sha1-96
```

### Certificate-based authentication

`--sftp=trusted-user-ca-key=...` specifies a file containing public key of certificate authority that is trusted
to sign user certificates for authentication.

Implementation is identical with "TrustedUserCAKeys" setting in OpenSSH server with exception that only one CA
key can be defined.

      val keyManager =
        newKeyManager(
          null,
          serverCert,
          serverIntermediateCa.certificate,
        )
      val trustManager =
        newTrustManager(
          null,
          Arrays.asList(serverRootCa.certificate, clientRootCa.certificate),
          emptyList(),
        )
      val sslContext = SSLContext.getInstance("TLS")
      sslContext.init(

  @get:JvmName("localCertificates") val localCertificates: List<Certificate>,
  // Delayed provider of peerCertificates, to allow lazy cleaning.
  peerCertificatesFn: () -> List<Certificate>,
) {
  /** Returns a possibly-empty list of certificates that identify the remote peer. */
  @get:JvmName("peerCertificates")
  val peerCertificates: List<Certificate> by lazy {
    try {
      peerCertificatesFn()

    assertTrue(pin.matchesCertificate(certA1.certificate))
    assertFalse(pin.matchesCertificate(certB1.certificate))
  }

  @Test fun testMatchesSha1() {
    val pin = Pin("example.com", certC1Sha1Pin)
    assertTrue(pin.matchesCertificate(certC1.certificate))
    assertFalse(pin.matchesCertificate(certB1.certificate))
  }

  @Test fun pinList() {
    val builder =

      8V0vxo1pHXnbBrnxhS/Z3TBerw8RyQqcaWOdp+pBXyIWmR+jHk9cHZCqQveTIBsY
      jaA9VEhgdaVhxBsT2qzUNDsXlOzGsliznDfoqETb
      -----END CERTIFICATE-----
      
      """.trimIndent()
    val certificate = certificateString.decodeCertificatePem()
    assertEquals(certificateString, certificate.certificatePem())
  }

    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

import okhttp3.mockwebserver.MockResponse;
import okhttp3.mockwebserver.MockWebServer;
import okhttp3.tls.HandshakeCertificates;
import okhttp3.tls.HeldCertificate;

/**
 * Create an HTTPS server with a self-signed certificate that OkHttp trusts.
 */
public class HttpsServer {
  public void run() throws Exception {
    HeldCertificate localhostCertificate = new HeldCertificate.Builder()
        .addSubjectAlternativeName("localhost")

      + "jaA9VEhgdaVhxBsT2qzUNDsXlOzGsliznDfoqETb\n"
      + "-----END CERTIFICATE-----\n";

    X509Certificate certificate =
        Certificates.decodeCertificatePem(certificateString);

    assertEquals(certificateString, Certificates.certificatePem(certificate));
  }

import java.util.Map;

import javax.security.auth.kerberos.KerberosKey;

import jcifs.pac.PACDecodingException;
import jcifs.pac.Pac;

/**
 * Kerberos authorization data containing PAC (Privilege Attribute Certificate) information.
 */
public class KerberosPacAuthData extends KerberosAuthData {

    private Pac pac;

    /**
     * Constructs KerberosPacAuthData from token bytes.
     *