Java

PDF Signatures with Built-in SVG Graphics

See more PDF Signatures Examples

This example demonstrates the built-in SVG graphics that can be applied to the appearance when signing a PDF.

Note: This example requires Chilkat v9.5.0.85 or greater.

Chilkat2 Java

import com.chilkatsoft.chilkat2.Cert;
import com.chilkatsoft.chilkat2.ChilkatException;
import com.chilkatsoft.chilkat2.JsonObject;
import com.chilkatsoft.chilkat2.Pdf;

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.

        Pdf pdf = new Pdf();

        // Load a PDF to be signed.
        // The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
        try {
            pdf.loadFile("qa_data/pdf/hello.pdf");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        // Options for signing are specified in JSON.
        JsonObject json = new JsonObject();

        // In most cases, the signingCertificateV2 and signingTime attributes are required.
        json.updateInt("signingCertificateV2", 1);
        json.updateInt("signingTime", 1);

        // Specify the location/position, scale, and content of the signature's appearance.
        json.updateInt("page", 1);
        json.updateString("appearance.y", "top");
        json.updateString("appearance.x", "left");
        json.updateString("appearance.fontScale", "10.0");
        json.updateString("appearance.text[0]", "Digitally signed by: cert_cn");
        json.updateString("appearance.text[1]", "current_dt");
        json.updateString("appearance.text[2]", "The crazy brown fox jumps over the lazy dog.");

        // In addition to the above, this example adds a built-in SVG graphic to the appearance.
        // The built-in SVG graphic is specified by a name, such as "green-check-grey-circle".
        // The full list of graphic names and images are shown below.
        json.updateString("appearance.image", "green-check-grey-circle");

        // The graphic can be placed "left", "center", or "right".
        // If "center", then the graphic is displayed behind the text.
        json.updateString("appearance.imagePlacement", "left");

        // The graphic's opacity can range from 1 to 100.
        // Centered graphics look best with less opacity (50 or less).
        // In this example, we'll keep the opacity at 100.
        json.updateString("appearance.imageOpacity", "100");

        // Here's an example of the signature's appearance if we centered the SVG graphic with an opacity of 40%
        // 

        // Load the signing certificate. (Use your own certificate.)
        Cert cert = new Cert();
        try {
            cert.loadPfxFile("qa_data/pfx/myPdfSigningCert.pfx", "secret");

            // Tell the pdf object to use the certificate for signing.
            pdf.setSigningCert(cert);

            pdf.signPdf(json, "qa_output/hello_signed.pdf");
        } catch (ChilkatException e) {
            System.out.println(e.getLastErrorText());
            return;
        }

        System.out.println("The PDF has been successfully cryptographically signed.");

        // The appearance of the signature appears in Adobe Acrobat as shown here:

        // 

        // The SVG icon graphics are embedded within the Chilkat library,
        // and were graciously provided by uxwing - Free SVG Icons
        //
        // The uxwing licensing terms are reproduced here and can be verified at uxwing licensing

        // Icons from uxwing.com are free (see https://uxwing.com/license/)
        //     - All icons on UXWing free to download, and use personal, commercial projects.
        //     - Attribution and Credit is NOT required, however, any credit will be much appreciated.
        //     - There is no limit to the number of times you can use.
        //     - You may modify the resources according to your requirements.

        // The set of SVG names and the corresponding graphics are shown below.
        //
        // For example, if we specify "green-check-green-circle"
        json.updateString("appearance.image", "green-check-green-circle");
        // We get:
        // 

        // "application-approved"
        // 

        // "application-rejected"
        // 

        // "document-accepted"
        // 

        // "approved"
        // 

        // "blue-check-mark"
        // 

        // "green-check-mark"
        // 

        // "green-check-grey-circle"
        // 

        // "red-x-red-circle"
        // 

        // "rejected"
        // 

        // "result-failure"
        // 

        // "result-pass"
        // 

        // "signature"
        // 

        // "document-check"
        // 

        // "document-x"
        // 

        // "red-x-grey-circle"
        // 
    }
}