(Java) RSA Signature with Certificate's Private Key from PFX

See more RSA Examples

Demonstrates how to use a certificate's private key from a PFX file to create an RSA signature.

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

    // Create an instance of a certificate store object, load a PFX file,
    // locate the certificate we need, and use it for signing.
    // (a PFX file may contain more than one certificate.)
    CkCertStore certStore = new CkCertStore();

    // The 1st argument is the filename, the 2nd arg is the 
    // PFX file's password:
    boolean success = certStore.LoadPfxFile("chilkat.pfx","test");
    if (success != true) {
        System.out.println(certStore.lastErrorText());
        return;
        }

    CkCert cert = certStore.FindCertBySubject("Chilkat Software, Inc.");
    if (certStore.get_LastMethodSuccess() == false) {
        System.out.println(certStore.lastErrorText());
        return;
        }

    CkPrivateKey pkey = cert.ExportPrivateKey();
    if (cert.get_LastMethodSuccess() == false) {
        System.out.println(cert.lastErrorText());

        return;
        }

    // Get the private key in XML format:
    String pkeyXml = pkey.getXml();

    CkRsa rsa = new CkRsa();

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

        return;
        }

    // Encode the signature as a hex string
    rsa.put_EncodingMode("hex");

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

    // Sign the string using the sha-1 hash algorithm.
    // Other valid choices are "sha-256", "md2" and "md5".
    String hexSig = rsa.signStringENC(strData,"sha-1");

    System.out.println(hexSig);

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