(Java) Get the Server Certificate, Certificate Chain, and Root CA Certificate

Demonstrates how to get the HTTP server certificate, its certificate chain, and the root CA certificate.

Note: This example requires Chilkat v11.0.0 or greater.

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import com.chilkatsoft.*;

public class ChilkatExample {

  static {
    try {
        System.loadLibrary("chilkat");
    } catch (UnsatisfiedLinkError e) {
      System.err.println("Native code library failed to load.\n" + e);
      System.exit(1);
    }
  }

  public static void main(String argv[])
  {
    boolean success = false;

    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    CkHttp http = new CkHttp();

    // We're getting the SSL/TLS certificate, so make sure to connect to the SSL/TLS port (443).
    CkCert sslCert = new CkCert();
    success = http.GetServerCert("apple.com",443,sslCert);
    if (success == false) {
        System.out.println(http.lastErrorText());
        return;
        }

    CkCertChain certChain = new CkCertChain();
    success = sslCert.BuildCertChain(certChain);
    if (success == false) {
        System.out.println(sslCert.lastErrorText());
        return;
        }

    CkCert cert = new CkCert();
    int i = 0;
    int numCerts = certChain.get_NumCerts();
    while (i < numCerts) {
        certChain.CertAt(i,cert);
        System.out.println("SubjectDN " + i + ": " + cert.subjectDN());
        System.out.println("IssuerDN " + i + ": " + cert.issuerDN());
        i = i+1;
        }

    // If the certificate chain reaches the root CA cert, then the last cert in the chain
    // is the root CA cert.
    if (certChain.get_ReachesRoot() == true) {
        CkCert caCert = new CkCert();
        certChain.CertAt(numCerts - 1,caCert);
        System.out.println("CA Root Cert: " + caCert.subjectDN());
        }
  }
}