Unicode C++

Set Cert and Private Key for S/MIME Decryption

Demonstrates the Chilkat Imap.SetDecryptCert2 method, which specifies a certificate together with a separately supplied private key for decrypting S/MIME messages. The first argument is the Cert and the second is the PrivateKey. This example loads the certificate and key from separate files.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: Sometimes the certificate (the public part) and the private key are stored separately — a .cer alongside a PEM key file, for instance. This method pairs them explicitly, whereas SetDecryptCert expects a single Cert that already provides its private key. After the pairing, subsequently downloaded S/MIME messages are decrypted automatically.

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#include <CkImapW.h>
#include <CkCertW.h>
#include <CkPrivateKeyW.h>

void ChilkatSample(void)
    {
    bool success = false;

    //  Demonstrates the Imap.SetDecryptCert2 method, which specifies a certificate together with a
    //  separately supplied private key for decrypting S/MIME messages.  The 1st argument is the
    //  Cert and the 2nd is the PrivateKey.

    CkImapW imap;

    imap.put_Ssl(true);
    imap.put_Port(993);

    success = imap.Connect(L"imap.example.com");
    if (success == false) {
        wprintf(L"%s\n",imap.lastErrorText());
        return;
    }

    success = imap.Login(L"user@example.com",L"myPassword");
    if (success == false) {
        wprintf(L"%s\n",imap.lastErrorText());
        return;
    }

    //  Load the certificate and its private key from separate files.
    CkCertW cert;
    success = cert.LoadFromFile(L"qa_data/smime.cer");
    if (success == false) {
        wprintf(L"%s\n",cert.lastErrorText());
        return;
    }

    CkPrivateKeyW privKey;
    success = privKey.LoadPemFile(L"qa_data/smime_privkey.pem");
    if (success == false) {
        wprintf(L"%s\n",privKey.lastErrorText());
        return;
    }

    //  Use the cert and key to automatically decrypt subsequently downloaded S/MIME messages.
    success = imap.SetDecryptCert2(cert,privKey);
    if (success == false) {
        wprintf(L"%s\n",imap.lastErrorText());
        return;
    }

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