Java

Duplicate OpensSSL to Create Signature using Cert and Key Files

See more OpenSSL Examples

This example duplicates the following:

openssl smime –sign -in something.xml -out something.der -signer mycert.crt -inkey cert.key -outform der –nodetach

Note: Although "smime" is the OpenSSL command, it's not actually producing S/MIME. The arguments "-outform der -binary" indicates that the output is binary DER (i.e. the PKCS7 binary signature). The input can be any type of file: XML, PDF, JPG, ... *anything*...

Chilkat2 Java

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

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();

        // Load the cert and private key from separate files.
        Cert cert = new Cert();
        try {
            cert.loadFromFile("myCert.crt");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        BinData bd = new BinData();
        bd.loadFile("cert.key");
        PrivateKey privkey = new PrivateKey();
        // Load from any format private key.
        // If the file does not need a password, the 2nd arg is ignored.
        try {
            privkey.loadAnyFormat(bd, "password_if_needed");

            crypt.setSigningCert2(cert, privkey);

            // Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
            crypt.createP7M("qa_data/infile.anything", "qa_output/outfile.der");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

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