(Unicode C++) Sign a File to Create a .p7m File (using a PFX)

Unicode C++ example to sign a file creating a .p7m file as output. The .p7m contains the signed contents of the original file. It can be verified and restored by calling VerifyP7M.

Note: This example requires Chilkat v10.1.2 or greater.

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

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

    CkCrypt2W crypt;

    // Use a digital certificate and private key from a PFX file (.pfx or .p12).
    const wchar_t *signingCertSubject = L"Acme Inc";
    const wchar_t *pfxFilename = L"/Users/chilkat/testData/pfx/acme.pfx";
    const wchar_t *pfxPassword = L"test123";

    CkCertStoreW certStore;
    bool success = certStore.LoadPfxFile(pfxFilename,pfxPassword);
    if (success != true) {
        wprintf(L"%s\n",certStore.lastErrorText());
        return;
    }

    CkJsonObjectW jsonCN;
    jsonCN.UpdateString(L"CN",signingCertSubject);

    CkCertW cert;
    success = certStore.FindCert(jsonCN,cert);
    if (success == false) {
        wprintf(L"Failed to find certificate by subject common name.\n");
        return;
    }

    // Tell the crypt component to use this cert.
    success = crypt.SetSigningCert(cert);

    // We can sign any type of file, creating a .p7m as output:
    const wchar_t *inFile = L"/Users/chilkat/testData/pdf/sample.pdf";
    const wchar_t *outputFile = L"/Users/chilkat/testData/p7m/sample.pdf.p7m";
    success = crypt.CreateP7M(inFile,outputFile);
    if (success == false) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    // Verify and restore the original file:
    success = crypt.SetVerifyCert(cert);

    inFile = outputFile;
    outputFile = L"/Users/chilkat/testData/pdf/restored.pdf";

    success = crypt.VerifyP7M(inFile,outputFile);
    if (success == false) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

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