(Java) Iterate Keys and Certs in PEM

Demonstrates how to access each of the private keys and certs contained within a PEM.

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.

    CkPem pem = new CkPem();

    // Load the PEM from a file.
    // If the PEM is encrypted, provide a password.  Otherwise pass an empty string for the password.
    String password = "myPassword";
    success = pem.LoadPemFile("../myPemFiles/myPem.pem",password);
    if (success == false) {
        System.out.println(pem.lastErrorText());
        return;
        }

    // Note: If the app already has the PEM pre-loaded in a string variable, then load it 
    // by calling LoadPem instead.  
    String pemContent = "... the PEM contents ...";
    success = pem.LoadPem(pemContent,password);
    // Check for success as before..

    // Iterate over the private keys.
    int numPrivateKeys = pem.get_NumPrivateKeys();
    int i = 0;

    CkPrivateKey privKey = new CkPrivateKey();
    while (i < numPrivateKeys) {
        pem.PrivateKeyAt(i,privKey);
        System.out.println("Private Key " + i + " is " + privKey.get_BitLength() + " in length");
        i = i+1;
        }

    // Iterate over the certificates.
    CkCert cert = new CkCert();
    int numCerts = pem.get_NumCerts();
    i = 0;
    while (i < numCerts) {
        pem.CertAt(i,cert);
        System.out.println("Certificate " + i + " : " + cert.subjectDN());
        i = i+1;
        }
  }
}