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.

bool success = false;

Chilkat.Mime mime = new Chilkat.Mime();
success = mime.LoadMimeFile("qa_data/encrypted.eml");
if (success == false) {
    Debug.WriteLine(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.
string pfxPassword = "myPfxPassword";
Chilkat.Cert cert = new Chilkat.Cert();
success = cert.LoadPfxFile("qa_data/recipient.pfx",pfxPassword);
if (success == false) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

success = mime.DecryptUsingCert(cert);
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

string body = mime.GetBodyDecoded();
if (mime.LastMethodSuccess == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

Debug.WriteLine(body);