(MFC) Create ICP-Brasil Compliant CMS Signature

Demonstrates how to create a .p7s signature that contains a data file, which in this case is a PDF. The .p7s will be compliant with the ICP-Brazil Digital Signature Standard.

The .p7s file created by this example can be verified at ICP-Brasil Online Verifier

Important: This example requires Chilkat v9.5.0.83 or later.

For more information, see http://www.iti.gov.br/images/repositorio/consulta-publica/encerradas/DOC-ICP-15_-_Versao_2.2_VISAO_GERAL_SOBRE_ASSIN_DIG_NA_ICP-BRASIL_xx-xx-2015.pdf

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkCrypt2.h>
#include <CkBinData.h>
#include <CkCert.h>
#include <CkJsonObject.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    // ------------------------------------------------------------------------------------------------------
    // Note: This example creates a CMS signature (.p7s) that contains the PDF.
    // It is different than signing a PDF.  To sign a PDF where the resulting PDF contains the CMS signature,
    // see this example:  Sign PDF for ICP-Brasil
    // ------------------------------------------------------------------------------------------------------
    CkCrypt2 crypt;

    // Any type of file can be signed.  It doesn't have to be a PDF.
    const char *inFile = "qa_data/pdf/helloWorld.pdf";

    CkBinData bd;
    bool success = bd.LoadFile(inFile);
    if (success == false) {
        strOut.append("Failed to load ");
        strOut.append(inFile);
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // We'll be using a certificate w/ private key stored on a smartcard for signing.
    CkCert cert;

    // If the smartcard or token requires a PIN, we can set it here to avoid the dialog...
    cert.put_SmartCardPin("000000");

    success = cert.LoadFromSmartcard("");
    if (success != true) {
        strOut.append(cert.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Tell the crypt component to use this cert.
    success = crypt.SetSigningCert(cert);
    if (success != true) {
        strOut.append(crypt.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Set properties for signing...
    crypt.put_HashAlgorithm("sha1");

    CkJsonObject jsonSigningAttrs;
    jsonSigningAttrs.UpdateInt("contentType",1);
    jsonSigningAttrs.UpdateInt("signingTime",1);
    jsonSigningAttrs.UpdateInt("messageDigest",1);

    crypt.put_SigningAttributes(jsonSigningAttrs.emit());

    // The Brazil government validator requires the ASN.1 data to be in "constructed octets" form..
    crypt.put_UncommonOptions("UseConstructedOctets,OmitAlgorithmIdNull");
    crypt.put_IncludeCertChain(false);

    // Sign. 
    success = crypt.OpaqueSignBd(bd);
    if (success == false) {
        strOut.append(crypt.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Save to a .p7s
    success = bd.WriteFile("qa_output/helloWorld.pdf.p7s");

    strOut.append("Success");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }