(Unicode C++) Duplicate OpensSSL to Create Signature using Cert and Key Files

This example duplicates the following:

openssl smime –sign -in something.xml -out something.der -signer mycert.crt -inkey cert.key -outform der –nodetach

Note: Although "smime" is the OpenSSL command, it's not actually producing S/MIME. The arguments "-outform der -binary" indicates that the output is binary DER (i.e. the PKCS7 binary signature). The input can be any type of file: XML, PDF, JPG, ... *anything*...

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

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

    CkCrypt2W crypt;

    // Load the cert and private key from separate files.
    CkCertW cert;
    bool success = cert.LoadFromFile(L"myCert.crt");
    if (success != true) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    CkBinDataW bd;
    success = bd.LoadFile(L"cert.key");
    CkPrivateKeyW privkey;
    // Load from any format private key.
    // If the file does not need a password, the 2nd arg is ignored.
    success = privkey.LoadAnyFormat(bd,L"password_if_needed");
    if (success != true) {
        wprintf(L"%s\n",privkey.lastErrorText());
        return;
    }

    success = crypt.SetSigningCert2(cert,privkey);
    if (success != true) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

    // Create the opaque signature (PKCS7 binary DER that contains both the signature and original file data).
    success = crypt.CreateP7M(L"qa_data/infile.anything",L"qa_output/outfile.der");
    if (success != true) {
        wprintf(L"%s\n",crypt.lastErrorText());
        return;
    }

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