(C#) Load .eml and Decrypt (smime.p7m)

Loads an encrypted email from a .eml file and decrypts using certificate w/ private key found in a .p12 (or .pfx) file.

The Content-Type and Content-Disposition email headers of the email to be decrypted look similar to this:

Content-Type: application/x-pkcs7-mime; smime-type=enveloped-data;
	name="smime.p7m"
Content-Disposition: attachment; filename="smime.p7m"

Download: Chilkat .NET Assemblies

Chilkat.Email email = new Chilkat.Email();

bool success;

//  Add a PFX (or .p12) to be used for decryption
success = email.AddPfxSourceFile("myCert.p12","passwordForP12");
if (success != true) {
    textBox1.Text += email.LastErrorText + "\r\n";
    return;
}

//  Loading the .eml automatically decrypts.
success = email.LoadEml("encrypted.eml");
if (success != true) {
    textBox1.Text += email.LastErrorText + "\r\n";
    return;
}

//  The email now exists as it was prior to encryption.
//  Your app may access the email's subject, body, attachments,
//  etc. using the Chilkat Email API...

//  Save the decrypted email:
success = email.SaveEml("decrypted.eml");
if (success != true) {
    textBox1.Text += email.LastErrorText + "\r\n";
    return;
}

textBox1.Text += "Success." + "\r\n";