(Java) RSA Sign Using Private Key from .pfx/.p12 to Base64 Signature

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Demonstrates how to RSA sign something using a private key loaded from a .pfx/.p12. The RSA signature is returned in Base64 encoded format.

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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.

    CkRsa rsa = new CkRsa();

    // Load the .pfx/.p12
    CkPfx pfx = new CkPfx();
    boolean success = pfx.LoadPfxFile("qa_data/pfx/myKey.p12","myPassword");
    if (success != true) {
        System.out.println(pfx.lastErrorText());
        return;
        }

    // Get the default private key.
    CkPrivateKey privKey = pfx.GetPrivateKey(0);
    if (pfx.get_LastMethodSuccess() != true) {
        System.out.println(pfx.lastErrorText());
        return;
        }

    // Import the private key into the RSA component:
    success = rsa.ImportPrivateKeyObj(privKey);
    if (success != true) {
        System.out.println(rsa.lastErrorText());

        return;
        }

    // Get the signature in base64
    rsa.put_EncodingMode("base64");

    String strData = "This is the string to be signed.";

    // Sign the string using the sha256 hash algorithm.
    // Other valid choices are "sha384", "sha512", "sha-1", "md2" and "md5".
    String base64Sig = rsa.signStringENC(strData,"sha256");

    System.out.println(base64Sig);

    System.out.println("Success!");
  }
}