Unicode C++

Sign String to create a CAdES-T Signature

See more CAdES Examples

This example will sign a string to create a CAdEST-T signature.

Note: This example requires Chilkat v9.5.0.78 or greater.

Unicode C++

#include <CkCrypt2W.h>
#include <CkCertW.h>
#include <CkJsonObjectW.h>
#include <CkBinDataW.h>

void ChilkatSample(void)
    {
    bool success = false;

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

    CkCrypt2W crypt;

    // This example will use the certificate + private key currently inserted into a smartcard reader.
    CkCertW cert;

    // If we wish to provide the smartcard PIN (otherwise the user will be prompted by the operating system).
    cert.put_SmartCardPin(L"000000");
    success = cert.LoadFromSmartcard(L"");
    if (success != true) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    // Note: It is also possible to use certs from .pfx/.p12, .pem, or other sources such as 
    // pre-installed Windows certificates.

    success = crypt.SetSigningCert(cert);

    // Use SHA-256 rather than the default of SHA-1
    crypt.put_HashAlgorithm(L"sha256");

    // Create JSON that tells Chilkat what signing attributes to include:
    CkJsonObjectW attrs;
    attrs.UpdateBool(L"contentType",true);
    attrs.UpdateBool(L"signingTime",true);
    attrs.UpdateBool(L"messageDigest",true);
    attrs.UpdateBool(L"signingCertificateV2",true);

    // A CAdES-T signature is one that includes a timestampToken created by an online TSA (time stamping authority).
    // We must include the TSA's URL, as well as a few options to indicate what is desired.
    // Except for the TSA URL, the options shown here are typically what you would need.
    attrs.UpdateBool(L"timestampToken.enabled",true);
    attrs.UpdateString(L"timestampToken.tsaUrl",L"https://freetsa.org/tsr");
    attrs.UpdateBool(L"timestampToken.addNonce",false);
    attrs.UpdateBool(L"timestampToken.requestTsaCert",true);
    attrs.UpdateString(L"timestampToken.hashAlg",L"sha256");

    crypt.put_SigningAttributes(attrs.emit());

    const wchar_t *strToSign = L"THIS IS MY ID";

    CkBinDataW bd;
    bd.AppendString(strToSign,L"utf-8");

    // This creates the CAdES-T signature.  During the signature creation, it
    // communicates with the TSA to get a timestampToken.
    // The contents of bd are signed and replaced with the CAdES-T signature (which embeds the original content).
    success = crypt.OpaqueSignBd(bd);
    if (success != true) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    // Get the signature in base64 format:
    wprintf(L"%s\n",bd.getEncoded(L"base64_mime"));

    // Or save the signature to a file.
    bd.WriteFile(L"qa_output/cades-t_sample.p7m");

    wprintf(L"Success.\n");
    }