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

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

    success = FALSE;

    mime = CkMimeW_Create();
    success = CkMimeW_LoadMimeFile(mime,L"qa_data/encrypted.eml");
    if (success == FALSE) {
        wprintf(L"%s\n",CkMimeW_lastErrorText(mime));
        CkMimeW_Dispose(mime);
        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.
    pfxPassword = L"myPfxPassword";
    cert = CkCertW_Create();
    success = CkCertW_LoadPfxFile(cert,L"qa_data/recipient.pfx",pfxPassword);
    if (success == FALSE) {
        wprintf(L"%s\n",CkCertW_lastErrorText(cert));
        CkMimeW_Dispose(mime);
        CkCertW_Dispose(cert);
        return;
    }

    success = CkMimeW_DecryptUsingCert(mime,cert);
    if (success == FALSE) {
        wprintf(L"%s\n",CkMimeW_lastErrorText(mime));
        CkMimeW_Dispose(mime);
        CkCertW_Dispose(cert);
        return;
    }

    body = CkMimeW_getBodyDecoded(mime);
    if (CkMimeW_getLastMethodSuccess(mime) == FALSE) {
        wprintf(L"%s\n",CkMimeW_lastErrorText(mime));
        CkMimeW_Dispose(mime);
        CkCertW_Dispose(cert);
        return;
    }

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


    CkMimeW_Dispose(mime);
    CkCertW_Dispose(cert);

    }