.NET Core C#

Create CAdES-BES .p7m using Smart Card or USB Token

See more Digital Signatures Examples

Demonstrates how to create a CAdES BES invoice.xml.p7m using a certificate stored on a smart card or USB token.

Note: This example requires Chilkat v9.5.0.77 and at the time of this writing is restricted to the Windows operating system.

.NET Core C#

bool success = false;

// Note: Requires Chilkat v9.5.0.77 or greater.

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

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

// Use a certificate on a smartcard or USB token.
Chilkat.Cert cert = new Chilkat.Cert();
// Load the certificate on the smartcard currently in the reader (or on the USB token).
// Pass an empty string to allow Chilkat to automatically choose the CSP (Cryptographi Service Provider).
// See Load Certificate on Smartcard for information about explicitly selecting a particular CSP.
success = cert.LoadFromSmartcard("");
if (success != true) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

// Provide the smartcard PIN.
// If the PIN is not explicitly provided here, the Windows OS should
// display a dialog for the PIN.
cert.SmartCardPin = "000000";

// Provide the certificate for signing.
success = crypt.SetSigningCert(cert);
if (success != true) {
    Debug.WriteLine(crypt.LastErrorText);
    return;
}

// Indicate that SHA-256 should be used.
crypt.HashAlgorithm = "sha256";

// Specify the signed attributes to be included.
// (This is what makes it CAdES-BES compliant.)
Chilkat.JsonObject jsonSignedAttrs = new Chilkat.JsonObject();
jsonSignedAttrs.UpdateInt("contentType",1);
jsonSignedAttrs.UpdateInt("signingTime",1);
jsonSignedAttrs.UpdateInt("messageDigest",1);
jsonSignedAttrs.UpdateInt("signingCertificateV2",1);
crypt.SigningAttributes = jsonSignedAttrs.Emit();

string inFile = "qa_data/xml/IT01234567890_11002.xml";
string sigFile = "qa_output/IT01234567890_11002.xml.p7m";

// Create the CAdES-BES signature, which contains the original data.
success = crypt.CreateP7M(inFile,sigFile);
if (success == false) {
    Debug.WriteLine(crypt.LastErrorText);
    return;
}

Debug.WriteLine("Success.");