(C++) Sign String to create a CAdES-T Signature, using HTTP Proxy to Access Timestamp Server

This example will sign a string to create a CAdEST-T signature. It will use an HTTP proxy to access the timestamp server.

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

void ChilkatSample(void)
    {
    CkCrypt2 crypt;

    CkCert cert;
    cert.put_SmartCardPin("123456");
    bool success = cert.LoadFromSmartcard("");
    if (success != true) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    success = crypt.SetSigningCert(cert);

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

    // Create JSON that tells Chilkat what signing attributes to include:
    CkJsonObject attrs;
    attrs.UpdateBool("contentType",true);
    attrs.UpdateBool("signingTime",true);
    attrs.UpdateBool("messageDigest",true);
    attrs.UpdateBool("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("timestampToken.enabled",true);
    attrs.UpdateString("timestampToken.tsaUrl","https://freetsa.org/tsr");
    attrs.UpdateBool("timestampToken.addNonce",false);
    attrs.UpdateBool("timestampToken.requestTsaCert",true);
    attrs.UpdateString("timestampToken.hashAlg","sha256");

    crypt.put_SigningAttributes(attrs.emit());

    const char *strToSign = "Hello World!";

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

    // -------------------------------------------------------------------------
    // The purpose of this example is to show how an HTTP object with custom
    // settings can be used to access the Internet when signing.
    // Access to the Internet is needed to communicate with the timestamp server.
    CkHttp http;
    // This can be a domain name, hostname, or IP address.
    http.put_ProxyDomain("172.16.16.56");
    http.put_ProxyPort(808);
    http.put_ProxyLogin("myProxyLogin");
    http.put_ProxyPassword("myProxyPassword");
    crypt.SetTsaHttpObj(http);
    // -------------------------------------------------------------------------

    // 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) {
        std::cout << crypt.lastErrorText() << "\r\n";
        return;
    }

    // Get the signature in base64 format:
    std::cout << bd.getEncoded("base64_mime") << "\r\n";

    std::cout << "Success." << "\r\n";
    }