(C++) Sign PDF for ICP-Brasil

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Sign a PDF to create a signed PDF compliant with the ICP-Brasil Digital Signature Standard Conformity Checker. (Verificador de Conformidade do Padrão de Assinatura Digital ICP-Brasil)

For more information, see https://verificador.iti.gov.br/verifier-2.6.2/

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#include <CkPdf.h>
#include <CkJsonObject.h>
#include <CkCert.h>

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

    // The signed PDF produced by this example should be verifiable at https://validar.iti.gov.br/
    CkPdf pdf;

    // Load a PDF to be signed.
    // The "hello.pdf" is available at https://chilkatsoft.com/hello.pdf
    bool success = pdf.LoadFile("qa_data/pdf/hello.pdf");
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    CkJsonObject json;

    // Define the appearance and location of the signature.
    json.UpdateInt("page",1);
    json.UpdateString("appearance.y","bottom");
    json.UpdateString("appearance.x","middle");
    json.UpdateString("appearance.fontScale","9.0");
    json.UpdateString("appearance.text[0]","Digitally signed by: cert_cn");
    json.UpdateString("appearance.text[1]","current_dt");
    json.UpdateString("appearance.image","document-accepted");
    json.UpdateString("appearance.imagePlacement","left");
    json.UpdateString("appearance.imageOpacity","100");

    // Add the CMS options required for ICP-Brasil
    json.UpdateInt("contentType",1);
    json.UpdateInt("messageDigest",1);
    json.UpdateInt("signingCertificateV2",1);
    json.UpdateBool("ltvOcsp",true);

    // Listed here are the currently existing profiles. (Chilkat will add additional ICP Brasil policy profiles in future versions as new ones are created.)
    // See https://www.gov.br/iti/pt-br/assuntos/repositorio/artefatos-de-assinatura-digital for more information.
    // 
    // PA_AD_RA_v1_1 --> 2.16.76.1.7.1.5.1.1
    // PA_AD_RA_v1_2 --> 2.16.76.1.7.1.5.1.2
    // PA_AD_RA_v2_0 --> 2.16.76.1.7.1.5.2
    // PA_AD_RA_v2_1 --> 2.16.76.1.7.1.5.2.1
    // PA_AD_RA_v2_2 --> 2.16.76.1.7.1.5.2.2
    // PA_AD_RA_v2_3 --> 2.16.76.1.7.1.5.2.3
    // PA_AD_RA_v2_4 --> 2.16.76.1.7.1.5.2.4

    // PA_AD_RB_v1_1 --> 2.16.76.1.7.1.1.1.1
    // PA_AD_RB_v2_0 --> 2.16.76.1.7.1.1.2
    // PA_AD_RB_v2_1 --> 2.16.76.1.7.1.1.2.1
    // PA_AD_RB_v2_2 --> 2.16.76.1.7.1.1.2.2
    // PA_AD_RB_v2_3 --> 2.16.76.1.7.1.1.2.3

    // PA_AD_RC_v1_1 --> 2.16.76.1.7.1.4.1.1
    // PA_AD_RC_v2_0 --> 2.16.76.1.7.1.4.2
    // PA_AD_RC_v2_1 --> 2.16.76.1.7.1.4.2.1
    // PA_AD_RC_v2_2 --> 2.16.76.1.7.1.4.2.2
    // PA_AD_RC_v2_3 --> 2.16.76.1.7.1.4.2.3

    // PA_AD_RT_v1_1 --> 2.16.76.1.7.1.2.1.1
    // PA_AD_RT_v2_0 --> 2.16.76.1.7.1.2.2
    // PA_AD_RT_v2_1 --> 2.16.76.1.7.1.2.2.1
    // PA_AD_RT_v2_2 --> 2.16.76.1.7.1.2.2.2
    // PA_AD_RT_v2_3 --> 2.16.76.1.7.1.2.2.3

    // PA_AD_RV_v1_1 --> 2.16.76.1.7.1.3.1.1
    // PA_AD_RV_v2_0 --> 2.16.76.1.7.1.3.2
    // PA_AD_RV_v2_1 --> 2.16.76.1.7.1.3.2.1
    // PA_AD_RV_v2_2 --> 2.16.76.1.7.1.3.2.2
    // PA_AD_RV_v2_3 --> 2.16.76.1.7.1.3.2.3

    // PA_PAdES_AD_RA_v1_0 --> 2.16.76.1.7.1.14.1
    // PA_PAdES_AD_RA_v1_1 --> 2.16.76.1.7.1.14.1.1
    // PA_PAdES_AD_RA_v1_2 --> 2.16.76.1.7.1.14.1.2
    // PA_PAdES_AD_RB_v1_0 --> 2.16.76.1.7.1.11.1
    // PA_PAdES_AD_RB_v1_1 --> 2.16.76.1.7.1.11.1.1
    // PA_PAdES_AD_RC_v1_0 --> 2.16.76.1.7.1.13.1
    // PA_PAdES_AD_RC_v1_1 --> 2.16.76.1.7.1.13.1.1
    // PA_PAdES_AD_RC_v1_2 --> 2.16.76.1.7.1.13.1.2
    // PA_PAdES_AD_RT_v1_0 --> 2.16.76.1.7.1.12.1
    // PA_PAdES_AD_RT_v1_1 --> 2.16.76.1.7.1.12.1.1

    // Set the policy profile name
    // ---------------------------------------------------
    // Note: On 24-May-2024, I was informed that adding the "policyId.profile"
    // causes the PDF signature to fail validation at https://validar.iti.gov.br/
    // Perhaps something changed in the years since this example was originally written and tested to be working.
    // You may need to omit the "policyId.profile".
    // ---------------------------------------------------
    json.UpdateString("policyId.profile","PA_PAdES_AD_RB_v1_1");

    // Load the signing certificate. (Use your own certificate.)
    // Note: If loading from a smart card, call LoadFromSmartcard instead, and make sure to use Chilkat v9.5.0.88 or later.
    CkCert cert;
    success = cert.LoadPfxFile("qa_data/pfx/myPdfSigningCert.pfx","pfx_password");
    if (success == false) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    // Tell the pdf object to use the certificate for signing.
    success = pdf.SetSigningCert(cert);
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    success = pdf.SignPdf(json,"qa_output/hello_signed.pdf");
    if (success == false) {
        std::cout << pdf.lastErrorText() << "\r\n";
        return;
    }

    std::cout << "The PDF has been successfully cryptographically signed." << "\r\n";
    }