(Java) Examine SSL/TLS Server Certificate

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Demonstrates how an application can examine and check a server's SSL/TLS certificate.

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

    CkSocket socket = new CkSocket();

    // Connect to a server.
    boolean useTls = true;
    int maxWaitMs = 2000;
    boolean success = socket.Connect("www.intel.com",443,useTls,maxWaitMs);
    if (success == false) {
        System.out.println(socket.lastErrorText());
        return;
        }

    // If we get here, the TLS connection ws made..
    // In any SSL/TLS handshake, the server sends its certificate in a TLS handshake message.
    // Chilkat will keep it cached within the object that made the connection.
    // Get the server's cert and examine a few things.
    CkCert cert = socket.GetSslServerCert();
    if (socket.get_LastMethodSuccess() == false) {
        // This is unexpected..
        System.out.println(socket.lastErrorText());
        return;
        }

    System.out.println("Distinguished Name: " + cert.subjectDN());
    System.out.println("Common Name: " + cert.subjectCN());
    System.out.println("Issuer Distinguished Name: " + cert.issuerDN());
    System.out.println("Issuer Common Name: " + cert.issuerCN());

    System.out.println("Expired: " + cert.get_Expired());
    System.out.println("Revoked: " + cert.get_Revoked());
    System.out.println("Signature Verified: " + cert.get_SignatureVerified());
    System.out.println("Trusted Root: " + cert.get_TrustedRoot());

    // Sample output:

    // Distinguished Name: C=US, ST=California, O=Intel Corporation, CN=*.intel.com
    // Common Name: *.intel.com
    // Issuer Distinguished Name: C=GB, ST=Greater Manchester, L=Salford, O=Sectigo Limited, CN=Sectigo RSA Organization Validation Secure Server CA
    // Issuer Common Name: Sectigo RSA Organization Validation Secure Server CA
    // Expired: False
    // Revoked: False
    // Signature Verified: True
    // Trusted Root: True
  }
}