(C) PKCS11 Sign PDF using Certificate and Private Key on Smart Card / USB Token

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Sample code showing how to use PKCS11 to sign a PDF with a certificate and private key stored on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.96 or later.

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#include <C_CkPkcs11.h>
#include <C_CkCert.h>
#include <C_CkPdf.h>
#include <C_CkJsonObject.h>

void ChilkatSample(void)
    {
    HCkPkcs11 pkcs11;
    const char *pin;
    int userType;
    BOOL success;
    HCkCert cert;
    HCkPdf pdf;
    HCkJsonObject json;
    int i;

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

    // Note: Chilkat's PKCS11 implementation runs on Windows, Linux, Mac OS X, and other supported operating systems.

    pkcs11 = CkPkcs11_Create();

    CkPkcs11_putSharedLibPath(pkcs11,"C:/Program Files (x86)/Gemalto/IDGo 800 PKCS#11/IDPrimePKCS1164.dll");
    pin = "0000";
    userType = 1;

    // Establish a PKCS11 logged-on session using the driver (.so, .dylib, or .dll) as specified in the SharedLibPath above.
    success = CkPkcs11_QuickSession(pkcs11,userType,pin);
    if (success == FALSE) {
        printf("%s\n",CkPkcs11_lastErrorText(pkcs11));
        CkPkcs11_Dispose(pkcs11);
        return;
    }

    // Get the certificate (on the smart card) that has a private key.
    // There are other ways to locate a certificate on the HSM.
    // This example assumes there is a single certificate w/ private key.
    cert = CkCert_Create();
    success = CkPkcs11_FindCert(pkcs11,"privateKey","",cert);
    if (success == TRUE) {
        printf("Cert with private key: %s\n",CkCert_subjectCN(cert));
    }
    else {
        printf("No certificates having a private key were found.\n");
        success = CkPkcs11_CloseSession(pkcs11);
        CkPkcs11_Dispose(pkcs11);
        CkCert_Dispose(cert);
        return;
    }

    // --------------------------------------------------------------------------
    // At this point, we have the cert to be used for signing.
    // Our PDF signing code is the same as for a cert obtained from any other source..

    pdf = CkPdf_Create();

    // Load a PDF to be signed.
    success = CkPdf_LoadFile(pdf,"qa_data/pdf/hello.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        success = CkPkcs11_CloseSession(pkcs11);
        CkPkcs11_Dispose(pkcs11);
        CkCert_Dispose(cert);
        CkPdf_Dispose(pdf);
        return;
    }

    json = CkJsonObject_Create();

    CkJsonObject_UpdateInt(json,"page",1);
    CkJsonObject_UpdateString(json,"appearance.y","top");
    CkJsonObject_UpdateString(json,"appearance.x","left");
    CkJsonObject_UpdateString(json,"appearance.fontScale","10.0");
    CkJsonObject_UpdateString(json,"signingAlgorithm","pss");
    CkJsonObject_UpdateString(json,"hashAlgorithm","sha256");

    i = 0;
    CkJsonObject_putI(json,i);
    CkJsonObject_UpdateString(json,"appearance.text[i]","Digitaly signed by: Xyz Widgets, Inc.");
    i = i + 1;
    CkJsonObject_putI(json,i);
    CkJsonObject_UpdateString(json,"appearance.text[i]","current_dt");
    i = i + 1;
    CkJsonObject_putI(json,i);
    CkJsonObject_UpdateString(json,"appearance.text[i]","blah blah blah");

    // The certificate is internally linked to the Pkcs11 object, which is currently in an authenticated session.
    success = CkPdf_SetSigningCert(pdf,cert);

    success = CkPdf_SignPdf(pdf,json,"qa_output/out.pdf");
    if (success == FALSE) {
        printf("%s\n",CkPdf_lastErrorText(pdf));
        success = CkPkcs11_CloseSession(pkcs11);
        CkPkcs11_Dispose(pkcs11);
        CkCert_Dispose(cert);
        CkPdf_Dispose(pdf);
        CkJsonObject_Dispose(json);
        return;
    }

    // --------------------------------------------------------------------------

    // Revert to an unauthenticated session by calling Logout.
    success = CkPkcs11_Logout(pkcs11);
    if (success == FALSE) {
        printf("%s\n",CkPkcs11_lastErrorText(pkcs11));
        success = CkPkcs11_CloseSession(pkcs11);
        CkPkcs11_Dispose(pkcs11);
        CkCert_Dispose(cert);
        CkPdf_Dispose(pdf);
        CkJsonObject_Dispose(json);
        return;
    }

    // When finished, close the session.
    // It is important to close the session (memory leaks will occur if the session is not properly closed).
    success = CkPkcs11_CloseSession(pkcs11);
    if (success == FALSE) {
        printf("%s\n",CkPkcs11_lastErrorText(pkcs11));
        CkPkcs11_Dispose(pkcs11);
        CkCert_Dispose(cert);
        CkPdf_Dispose(pdf);
        CkJsonObject_Dispose(json);
        return;
    }

    printf("Success.\n");


    CkPkcs11_Dispose(pkcs11);
    CkCert_Dispose(cert);
    CkPdf_Dispose(pdf);
    CkJsonObject_Dispose(json);

    }