Java Requires Chilkat v11.0.0+

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. Chilkat2 Java

import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.CertStore;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.PrivateKey;
import com.chilkatsoft.chilkat2.Rsa;

public class ChilkatExample {

    public static void main(String[] args) {
        // 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.)
        CertStore certStore = new CertStore();

        // The 1st argument is the filename, the 2nd arg is the
        // PFX file's password:
        try {
            certStore.loadPfxFile("chilkat.pfx", "test");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Find the certificate by the subject common name:
        JsonObject jsonCN = new JsonObject();
        jsonCN.updateString("CN", "cert common name");

        Cert cert = new Cert();
        try {
            certStore.findCert(jsonCN, cert);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        PrivateKey privKey = new PrivateKey();
        try {
            cert.getPrivateKey(privKey);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        Rsa rsa = new Rsa();

        try {
            rsa.usePrivateKey(privKey);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Encode the signature as a hex string
        rsa.setEncodingMode("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!");
    }
}