(.NET Core C#) AddDetachedSignaturePk

Demonstrates how to add a detached signature using a certifcate and it's corresponding private key. The easiest way of doing it is when both the certificate and private key are contained together within a PFX (.pfx or .p12) file. This example demonstrates how to use the certificate and its corresponding private key when they are stored in separate files -- a .cer for the certificate, and a .pem for the private key.

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

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

// Load the certificate from a .cer file.
Chilkat.Cert cert = new Chilkat.Cert();
bool success = cert.LoadFromFile("aaworkarea/myCert.cer");
if (success == false) {
    Debug.WriteLine(cert.LastErrorText);
    return;
}

// Load the private key from an encrypted PEM file.
// (A private key can be loaded from other file formats also..)
Chilkat.PrivateKey privKey = new Chilkat.PrivateKey();
success = privKey.LoadEncryptedPemFile("aaworkarea/myPrivateKey.pem","myPassword");
if (success == false) {
    Debug.WriteLine(privKey.LastErrorText);
    return;
}

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

// Sign the MIME (adds a PKCS7 detached signature)
success = mime.AddDetachedSignaturePk(cert,privKey);
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

// Save the S/MIME to a file.
success = mime.SaveMime("aaworkarea/signedMime.txt");
if (success == false) {
    Debug.WriteLine(mime.LastErrorText);
    return;
}

Debug.WriteLine("success!");