(C# UWP/WinRT) 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 Universal Windows Platform (UWP) / WinRT Downloads Chilkat for the Universal Windows Platform (UWP)

// 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
// ------------------------------------------------------------------------------------------------------
Chilkat.Crypt2 crypt = new Chilkat.Crypt2();

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

Chilkat.BinData bd = new Chilkat.BinData();
bool success = bd.LoadFile(inFile);
if (success == false) {
    Debug.WriteLine("Failed to load " + inFile);
    return;
}

// We'll be using a certificate w/ private key stored on a smartcard for signing.
Chilkat.Cert cert = new Chilkat.Cert();

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

success = cert.LoadFromSmartcard("");
if (success != true) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

// Tell the crypt component to use this cert.
success = crypt.SetSigningCert(cert);
if (success != true) {
    Debug.WriteLine(crypt.LastErrorText);
    return;
}

// Set properties for signing...
crypt.HashAlgorithm = "sha1";

Chilkat.JsonObject jsonSigningAttrs = new Chilkat.JsonObject();
jsonSigningAttrs.UpdateInt("contentType",1);
jsonSigningAttrs.UpdateInt("signingTime",1);
jsonSigningAttrs.UpdateInt("messageDigest",1);

crypt.SigningAttributes = jsonSigningAttrs.Emit();

// The Brazil government validator requires the ASN.1 data to be in "constructed octets" form..
crypt.UncommonOptions = "UseConstructedOctets,OmitAlgorithmIdNull";
crypt.IncludeCertChain = false;

// Sign. 
success = await crypt.OpaqueSignBdAsync(bd);
if (success == false) {
    Debug.WriteLine(crypt.LastErrorText);
    return;
}

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

Debug.WriteLine("Success");