(Unicode C++) SII Chile - FRMT Signature Computation and Add to XML

Compute the FRMT signature and add to the XML. This is the RSA signature of the SHA-1 digest of the "flattened" DD element.

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#include <CkXmlW.h>
#include <CkStringBuilderW.h>
#include <CkPrivateKeyW.h>
#include <CkRsaW.h>

void ChilkatSample(void)
    {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    // Also see:  Compute the FRMA Signature and Add to XML

    CkXmlW xml;

    // Load the unsigned XML that contains the following:

    // <DTE version="1.0">
    //   <Documento ID="F60T33">
    //         <TED version="1.0">
    //             <DD>
    // 		...
    //                 <CAF version="1.0">
    //                     <DA>
    // 			...
    //                     </DA>
    //                     <FRMA algoritmo="SHA1withRSA">...</FRMA>
    //                 </CAF>
    //                 ...
    //             </DD>
    //             ... The FRMT will be added here in another example ...
    //         </TED>
    //   </Documento>
    // </DTE>

    bool success = xml.LoadXmlFile(L"qa_data/xml_dsig/sii_cl/test_1.xml");
    if (success == false) {
        wprintf(L"Failed to load initial XML file.\n");
        return;
    }

    // Get a reference to the "DD" element
    CkXmlW *ddXml = xml.FindChild(L"Documento|TED|DD");
    if (xml.get_LastMethodSuccess() == false) {
        wprintf(L"Failed to find DD element\n");
        return;
    }

    //  We need to get the "flattened" DD XML where:
    //    - No whitespace between elements.
    //    - The 5 pre-defined entities are converted.
    //    - The text is encoded in the ISO-8859-1 character set (Latin-1), 
    CkStringBuilderW sbFlattened;
    ddXml->put_EmitCompact(true);
    ddXml->put_EmitXmlDecl(false);
    ddXml->GetXmlSb(sbFlattened);

    // Compute the SHA-1 message digest of the iso-8859-1 byte representation, 
    // and sign it with our RSA private key, getting the result in base64 format.

    CkPrivateKeyW privKey;
    success = privKey.LoadAnyFormatFile(L"qa_data/rsa/rsaPrivKey_pkcs8.pem",L"");
    if (success == false) {
        wprintf(L"%s\n",privKey.lastErrorText());
        return;
    }

    CkRsaW rsa;
    rsa.ImportPrivateKeyObj(privKey);

    rsa.put_EncodingMode(L"base64");
    rsa.put_Charset(L"iso-8859-1");
    const wchar_t *sig = rsa.signStringENC(sbFlattened.getAsString(),L"sha1");

    // Add the FRMT signature element to the XML.
    xml.UpdateChildContent(L"Documento|TED|FRMT",sig);
    xml.UpdateAttrAt(L"Documento|TED|FRMT",true,L"algoritmo",L"SHA1withRSA");

    delete ddXml;

    // See what we have:
    xml.put_EmitCompact(false);
    xml.put_EmitXmlDecl(true);
    wprintf(L"%s\n",xml.getXml());
    }