C

Add a Document Timestamp Signature to an already-signed PDF

See more PDF Signatures Examples

Demonstrates how to add a document timestamp signature to an already-signed PDF.

Note: This example requires Chilkat v9.5.0.99 or greater.

C

#include <C_CkPdf.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    BOOL success;
    HCkPdf pdf;
    HCkJsonObject json;

    success = FALSE;

    // This example requires the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    pdf = CkPdf_Create();

    // Load the PDF that has already been signed.
    success = CkPdf_LoadFile(pdf,"qa_data/pdf/helloWorld_signed.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        CkPdf_Dispose(pdf);
        return;
    }

    json = CkJsonObject_Create();

    CkJsonObject_UpdateBool(json,"invisibleSignature",TRUE);
    CkJsonObject_UpdateString(json,"subFilter","/ETSI.RFC3161");

    CkJsonObject_UpdateBool(json,"timestampToken.enabled",TRUE);

    // In this example, we'll use a free TSA server (timestamp.digicert.com), but you may want to use your own timestamp authority server.
    CkJsonObject_UpdateString(json,"timestampToken.tsaUrl","http://timestamp.digicert.com");

    // If the timestamp server requires a username/password, do the following.  Otherwise omit the following few lines of code.
    CkJsonObject_UpdateString(json,"timestampToken.tsaUsername","the_tsa_username");
    CkJsonObject_UpdateString(json,"timestampToken.tsaPassword","the_tsa_password");

    // When requesting the timestamp token, ask the server to include its certificate in the timestamp token response.
    // This allows for the timestamp server's certificate to be included in the LTV validation (i.e. if the timestamp server
    // has an OCSP URL, then Chilkat will also do the OCSP request for the timestamp server's certificate.)
    CkJsonObject_UpdateBool(json,"timestampToken.requestTsaCert",TRUE);

    success = CkPdf_SignPdf(pdf,json,"c:/temp/qa_output/helloWorld_signed_2.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        CkPdf_Dispose(pdf);
        CkJsonObject_Dispose(json);
        return;
    }

    printf("Successfully added a Document Timestamp Signature to the PDF\n");


    CkPdf_Dispose(pdf);
    CkJsonObject_Dispose(json);

    }