PKCS7 Decrypt Using .pfx or .p12 File

Demonstrates how to decrypt MIME using a specifc PFX file (.pfx or .p12) for the source of certificate(s) and private key(s).

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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;
}

//  Load the MIME
success = mime.LoadMimeFile("encrypted.mim");
if (success == false) {
    textBox1.Text += mime.LastErrorText + "\r\n";
    return;
}

//  Decrypt using a specific PFX file:
string pfxPassword;
pfxPassword = "myPassword";
success = mime.DecryptUsingPfxFile("c:/myPfxFiles/myCertAndPrivateKey.pfx",pfxPassword);
if (success == false) {
    textBox1.Text += mime.LastErrorText + "\r\n";
    return;
}

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

//  Note: The MIME to be decrypted should look something like this
//  when viewed in a text editor:
//  (Note that the Content-Type is application/x-pkcs7-mime)
//  
Content-Disposition: attachment; filename="smime.p7m"
Content-Transfer-Encoding: base64
Content-Type: application/x-pkcs7-mime;
 name="smime.p7m"

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