Java

CoSign PKCS7/CMS Signed Data

See more Digital Signatures Examples

Demonstrates how to add a 2nd signature to a CMS SignedData. This is to add an additional signature, SignerInfo and certificate(s) to an existing CMS signed data.

In this example, we cosign an existing pdf.p7s

Note: The CoSign method is added in Chilkat v9.5.0.89.

Chilkat2 Java

import com.chilkatsoft.chilkat2.BinData;
import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.Crypt2;

public class ChilkatExample {

    public static void main(String[] args) {
        // This example assumes the Chilkat API to have been previously unlocked.
        // See Global Unlock Sample for sample code.

        Crypt2 crypt = new Crypt2();
        Cert cert = new Cert();

        // If loading from a smart card, set the smartcard PIN.
        cert.setSmartCardPin("0000");

        // Load a certificate in some way, such as from a smart card.
        // Chilkat provides other methods to load from a .pfx, .pem, or from the Windows certificate stores..
        try {
            cert.loadFromSmartcard("");

            crypt.setSigningCert(cert);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Load the file to be co-signed.
        // NOTE:  This is to cosign a PDF file contained within a CMS (PKCS7) message.
        // (In other words, the PDF is contained within the CMS SignedData, rather than the other way around
        // where a CMS signature is contained within a PDF.  Use Chilkat's PDF class to sign a PDF, which is
        // to embed a CMS signature within the PDF.)
        BinData bd = new BinData();
        try {
            bd.loadFile("qa_data/p7s/cosign/sample.pdf.p7s");
        } catch (ChilkatException e) {
            System.out.println("Failed to load pdf.p7s input file.");
            return;
        }

        // bd2 will contain the co-signed result.
        BinData bd2 = new BinData();
        try {
            crypt.coSign(bd, cert, bd2);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        try {
            bd.writeFile("qa_output/cosigned.pdf.p7s");
        } catch (ChilkatException e) {
            System.out.println("Failed to save pdf.p7s output file.");
            return;
        }

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