(MFC) Add S/MIME Signature using PFX

Add a digital signature to a MIME message using the certificate + private key from a PFX file.

Chilkat C/C++ Library Downloads MS Visual C/C++ Libs

See Also: Using MFC CString in Chilkat

#include <CkMime.h>
#include <CkCert.h>

void ChilkatSample(void)
    {
    CkString strOut;

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

    CkMime mime;

    // Load a PFX file into a certificate object.
    CkCert cert;
    const char *pfxFilepath = "pfxFiles/something.pfx";
    const char *pfxPassword = "secret";
    bool success = cert.LoadPfxFile(pfxFilepath,pfxPassword);
    if (success == false) {
        strOut.append(cert.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    success = mime.SetBodyFromPlainText("This is the plain-text MIME body.");

    mime.put_Charset("utf-8");
    mime.put_Encoding("quoted-printable");

    // Sign the MIME (adds a PKCS7 detached signature)
    success = mime.AddDetachedSignature(cert);
    if (success == false) {
        strOut.append(mime.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    // Save the S/MIME to a file.
    success = mime.SaveMime("/temp/signedMime.txt");
    if (success == false) {
        strOut.append(mime.lastErrorText());
        strOut.append("\r\n");
        SetDlgItemText(IDC_EDIT1,strOut.getUnicode());
        return;
    }

    strOut.append("success!");
    strOut.append("\r\n");


    SetDlgItemText(IDC_EDIT1,strOut.getUnicode());

    }