(Unicode C) Create PKCS7 Attached/Opaque Signature (S/MIME)

Create an S/MIME message with a PKCS7 attached/opaque signature.

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#include <C_CkMimeW.h>
#include <C_CkCertW.h>

void ChilkatSample(void)
    {
    HCkMimeW mime;
    HCkCertW cert;
    const wchar_t *pfxFilepath;
    const wchar_t *pfxPassword;
    BOOL success;

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

    mime = CkMimeW_Create();

    // Load a certificate w/ private key for signing.
    // There are many ways of getting a certificate object:
    // from a pfx file, from .cer and private-key files, from the
    // Windows registry-based certificate stores, etc.
    // Load a PFX file into a certificate object.
    cert = CkCertW_Create();
    pfxFilepath = L"pfxFiles/something.pfx";
    pfxPassword = L"secret";
    success = CkCertW_LoadPfxFile(cert,pfxFilepath,pfxPassword);
    if (success == FALSE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkMimeW_Dispose(mime);
        CkCertW_Dispose(cert);
        return;
    }

    // Create a very simple MIME message to be signed:
    success = CkMimeW_AddHeaderField(mime,L"Subject",L"This is a test");
    success = CkMimeW_AddHeaderField(mime,L"MyCustomHeader",L"abc123");
    CkMimeW_putContentType(mime,L"text/plain");
    CkMimeW_SetBody(mime,L"This is a plain-text body.");

    // Examine the MIME prior to signing:
    wprintf(L"--- MIME prior to signing ---\n");
    wprintf(L"%s\n",CkMimeW_getMime(mime));

    // The MIME prior to signing looks like this:
    // -------------------------------------------------------------------------------

    // Subject: This is a test
    // MyCustomHeader: abc123
    // Content-Type: text/plain
    // 
    // This is a plain-text body.

    // -------------------------------------------------------------------------------

    // The default hash algorithm used in the signing process is "SHA1".
    // To change it, set the SigningHashAlg property:
    CkMimeW_putSigningHashAlg(mime,L"SHA256");

    // Convert the MIME to PKCS7 signed-data.
    success = CkMimeW_ConvertToSigned(mime,cert);
    if (success == FALSE) {
        wprintf(L"%s\n",CkMimeW_lastErrorText(mime));
        CkMimeW_Dispose(mime);
        CkCertW_Dispose(cert);
        return;
    }

    // Examine the signed MIME
    wprintf(L"--- MIME converted to PKCS7 signed-data ---\n");
    wprintf(L"%s\n",CkMimeW_getMime(mime));

    // The MIME after signing looks like this:
    // -------------------------------------------------------------------------------

    // Subject: This is a test
    // MyCustomHeader: abc123
    // Content-Disposition: attachment; filename="smime.p7m"
    // Content-Transfer-Encoding: base64
    // Content-Type: application/x-pkcs7-mime;
    //  name="smime.p7m"; smime-type="signed-data"
    // 
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    // aQRnU3ViamVjdDogVGhpcyBpcyBhIHRlc3QNCk15Q3VzdG9tSGVhZGVyOiBhYmMxMjMNCkNvbnRl
    // bnQtVHlwZTogdGV4dC9wbGFpbg0KDQpUaGlzIGlzIGEgcGxhaW4tdGV4dCBib2R5LqCCCaAwggRm
    // MIIDTqADAgECAhBEvgyLUAAktBHTNi3gs18bMA0GCSqGSIb3DQEBBQUAMIGVMQswCQYDVQQGEwJV
    // UzELMAkGA1UECBMCVVQxFzAVBgNVBAcTDlNhbHQgTGFrZSBDaXR5MR4wHAYDVQQKExVUaGUgVVNF
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    // 

    // ------------------------------------------------------------------------------


    CkMimeW_Dispose(mime);
    CkCertW_Dispose(cert);

    }