Java Requires Chilkat v10.1.2+

Sign a File to Create a .p7s (Detached Signature)

See more Encryption Examples

_LANGUAGE_ example to create a detached signature file (.p7s) for any type file. The signature can be verified by calling VerifyP7S and passing the original filename and the .p7s filename. Chilkat2 Java

import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.CertStore;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Crypt2;
import com.chilkatsoft.chilkat2.JsonObject;

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.

        Crypt2 crypt = new Crypt2();

        // Use a digital certificate and private key from a PFX file (.pfx or .p12).
        String signingCertSubject = "Acme Inc";
        String pfxFilename = "/Users/chilkat/testData/pfx/acme.pfx";
        String pfxPassword = "test123";

        CertStore certStore = new CertStore();
        try {
            certStore.loadPfxFile(pfxFilename, pfxPassword);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        JsonObject jsonCN = new JsonObject();
        jsonCN.updateString("CN", signingCertSubject);

        Cert cert = new Cert();
        try {
            certStore.findCert(jsonCN, cert);
        } catch (ChilkatException e) {
            System.out.println("Failed to find certificate by subject common name.");
            return;
        }

        // Tell the crypt component to use this cert.
        crypt.setSigningCert(cert);

        // We can sign any type of file, creating a .p7s as output:
        String inFile = "/Users/chilkat/testData/pdf/sample.pdf";
        String sigFile = "/Users/chilkat/testData/p7s/sample.p7s";

        try {
            crypt.createP7S(inFile, sigFile);

            crypt.verifyP7S(inFile, sigFile);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

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