(C++) Decrypt a govtalk.gov.uk SOAP GovTalkMessage

Demonstrates how to decrypt the content contained in the XML of a GovTalkMessage SOAP response.

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#include <CkXml.h>
#include <CkCert.h>
#include <CkCrypt2.h>
#include <CkBinData.h>

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

    // The GovTalkMessage response looks something like this:

    // <?xml version="1.0" encoding="utf-8"?>
    // <GovTalkMessage xmlns="http://www.govtalk.gov.uk/CM/envelope">
    //   <EnvelopeVersion>3.1</EnvelopeVersion>
    //   <Header>
    //     <MessageDetails>
    //       <Class>CSSZ_DZDPN</Class>
    //       <Qualifier>request</Qualifier>
    //       <Function>submit</Function>
    //       <TransactionID />
    //       <AuditID />
    //       <CorrelationID>aaaaa</CorrelationID>
    //       <ResponseEndPoint PollInterval="0" />
    //       <Transformation>XML</Transformation>
    //       <GatewayTest />
    //       <GatewayTimestamp />
    //     </MessageDetails>
    //     <SenderDetails>
    //       <IDAuthentication>
    //         <SenderID />
    //         <Authentication>
    //           <Method>clear</Method>
    //           <Role />
    //           <Value />
    //         </Authentication>
    //       </IDAuthentication>
    //       <X509Certificate />
    //       <EmailAddress>somebody@example.com</EmailAddress>
    //     </SenderDetails>
    //   </Header>
    //   <GovTalkDetails>
    //     <Keys>
    //       <Key Type="vars">9999999999</Key>
    //     </Keys>
    //     <GatewayAdditions>
    //       <Source>VREP</Source>
    //     </GatewayAdditions>
    //   </GovTalkDetails>
    //   <Body>
    //     <Message xmlns="http://www.cssz.cz/XMLSchema/envelope" version="1.2" eType="DZDPN20">
    //       <Header>
    //         <Signature xmlns:dt="urn:schemas-microsoft-com:datatypes" dt:dt="bin.base64">MIIJ0A ... UMw=
    // </Signature>
    //         <Vendor productName="some product name" version="2019" />
    //       </Header>
    //       <Body xmlns:dt="urn:schemas-microsoft-com:datatypes" encrypted="yes" contentEncoding="gzip" dt:dt="bin.base64">MIIF2w ... N2vW</Body>
    //     </Message>
    //   </Body>
    // </GovTalkMessage>

    // We want to get the content of the Body and decrypt it.

    // First, let's get the content of the Body XML element, which is a base64 string starting with MIIF2w...

    CkXml xml;
    bool success = xml.LoadXmlFile("qa_data/xml/govTalkMessageResponse.xml");
    if (success == false) {
        std::cout << xml.lastErrorText() << "\r\n";
        return;
    }

    const char *Body = xml.getChildContent("Body|Message|Body");
    std::cout << Body << "\r\n";

    CkCert cert;
    success = cert.LoadPfxFile("qa_data/pfx/govTalkMessage_aaa.pfx","aaa");
    if (success == false) {
        std::cout << cert.lastErrorText() << "\r\n";
        return;
    }

    CkCrypt2 crypt;
    crypt.put_CryptAlgorithm("pki");
    success = crypt.SetDecryptCert(cert);
    if (success == false) {
        std::cout << crypt.lastErrorText() << "\r\n";
        return;
    }

    CkBinData bd;
    // Append the bytes to bd.
    success = bd.AppendEncoded(Body,"base64");

    // Decrypt in-place.
    success = crypt.DecryptBd(bd);
    if (success == false) {
        std::cout << crypt.lastErrorText() << "\r\n";
        return;
    }

    // Save the decrypted data to a file.
    success = bd.WriteFile("qa_output/out.dat");

    // If the decrypted data is non-text (binary) then we can examine it in an encoding, such as hex:
    std::cout << "Decrypted bytes as hex: " << bd.getEncoded("hex") << "\r\n";
    }