Decrypt S/MIME using a Certificate with Private Key Access

See more MIME Examples

Loads a CMS/PKCS #7 encrypted S/MIME message and decrypts it back to the original MIME content.

DecryptUsingCert takes a single certificate that already has access to its associated private key, for example a certificate loaded from a PFX.

The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

#include <CkMimeW.h>
#include <CkCertW.h>

void ChilkatSample(void)
    {
    bool success = false;

    CkMimeW mime;
    success = mime.LoadMimeFile(L"qa_data/encrypted.eml");
    if (success == false) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    //  Decrypt using a certificate that already provides access to its private key (for example loaded
    //  from a PFX).  The only argument is the certificate.
    const wchar_t *pfxPassword = L"myPfxPassword";
    CkCertW cert;
    success = cert.LoadPfxFile(L"qa_data/recipient.pfx",pfxPassword);
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    success = mime.DecryptUsingCert(cert);
    if (success == false) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    const wchar_t *body = mime.getBodyDecoded();
    if (mime.get_LastMethodSuccess() == false) {
        wprintf(L"%s\n",mime.lastErrorText());
        return;
    }

    wprintf(L"%s\n",body);
    }