PKCS7 Encrypt MIME

Encrypt MIME using a digital certificate to create PKCS7 encrypted S/MIME.

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Chilkat.Mime mime = new Chilkat.Mime();

bool success;
success = mime.UnlockComponent("Anything for 30-day trial.");
if (success == false) {
    textBox1.Text += mime.LastErrorText + "\r\n";
    return;
}

//  Build a simple MIME message to be encrypted:
mime.AddHeaderField("Content-Type","text/plain");
mime.AddHeaderField("abc","123");
mime.SetBody("This is a test");

//  A digital certificate is required to create PKCS7 encrypted MIME.
//  It can come from a variety of sources: .cer file, .pfx file, PEM files,
//  an in-memory representation, or directly from a Windows
//  registry-based certificate store.

//  This example will load a certificate object from a .cer file.
//  Note: Only the public-key is required to encrypt.  (Decryption
//  requires a private key.)

Chilkat.Cert cert = new Chilkat.Cert();
success = cert.LoadFromFile("myCert.cer");
if (success == false) {
    textBox1.Text += cert.LastErrorText + "\r\n";
    return;
}

//  Encrypt the MIME:
success = mime.Encrypt(cert);
if (success == false) {
    textBox1.Text += mime.LastErrorText + "\r\n";
    return;
}

//  Display the MIME:
textBox1.Text += mime.GetMime() + "\r\n";

//  The resulting S/MIME looks something like this:
//  
abc: 123
Content-Disposition: attachment; filename="smime.p7m"
Content-Transfer-Encoding: base64
Content-Type: application/x-pkcs7-mime;
 name="smime.p7m"

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