Java

Sign String to create a CAdES-T Signature

See more CAdES Examples

This example will sign a string to create a CAdEST-T signature.

Note: This example requires Chilkat v9.5.0.78 or greater.

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.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();

        // This example will use the certificate + private key currently inserted into a smartcard reader.
        Cert cert = new Cert();

        // If we wish to provide the smartcard PIN (otherwise the user will be prompted by the operating system).
        cert.setSmartCardPin("000000");
        try {
            cert.loadFromSmartcard("");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Note: It is also possible to use certs from .pfx/.p12, .pem, or other sources such as
        // pre-installed Windows certificates.

        crypt.setSigningCert(cert);

        // Use SHA-256 rather than the default of SHA-1
        crypt.setHashAlgorithm("sha256");

        // Create JSON that tells Chilkat what signing attributes to include:
        JsonObject attrs = new JsonObject();
        attrs.updateBool("contentType", true);
        attrs.updateBool("signingTime", true);
        attrs.updateBool("messageDigest", true);
        attrs.updateBool("signingCertificateV2", true);

        // A CAdES-T signature is one that includes a timestampToken created by an online TSA (time stamping authority).
        // We must include the TSA's URL, as well as a few options to indicate what is desired.
        // Except for the TSA URL, the options shown here are typically what you would need.
        attrs.updateBool("timestampToken.enabled", true);
        attrs.updateString("timestampToken.tsaUrl", "https://freetsa.org/tsr");
        attrs.updateBool("timestampToken.addNonce", false);
        attrs.updateBool("timestampToken.requestTsaCert", true);
        attrs.updateString("timestampToken.hashAlg", "sha256");

        crypt.setSigningAttributes(attrs.emit());

        String strToSign = "THIS IS MY ID";

        BinData bd = new BinData();
        bd.appendString(strToSign, "utf-8");

        // This creates the CAdES-T signature.  During the signature creation, it
        // communicates with the TSA to get a timestampToken.
        // The contents of bd are signed and replaced with the CAdES-T signature (which embeds the original content).
        try {
            crypt.opaqueSignBd(bd);
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Get the signature in base64 format:
        System.out.println(bd.getEncoded("base64_mime"));

        // Or save the signature to a file.
        bd.writeFile("qa_output/cades-t_sample.p7m");

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