Add a PFX Source (BinData) for S/MIME Decryption

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Demonstrates the Chilkat Imap.AddPfxSourceBd method, which adds PFX data held in a BinData as a source of certificates and private keys for S/MIME processing. The first argument is the BinData and the second is the PFX password. Call it once for each additional source.

Note: The certificate path is relative to the application's current working directory. Supply the path to your own certificate file.

Background: When downloading encrypted (S/MIME) email, Chilkat needs the recipient's private key to decrypt it. Adding one or more PFX sources gives Chilkat a pool of keys to search; the matching key is used automatically as messages are fetched. The BinData form is handy when the PFX comes from memory — a database blob or a downloaded buffer — rather than a file on disk. On Windows and macOS the system certificate stores are also searched automatically.

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bool success = false;

//  Demonstrates the Imap.AddPfxSourceBd method, which adds PFX data (from a BinData) as a
//  source of certificates and private keys for S/MIME decryption.  The 1st argument is the
//  BinData containing the PFX, and the 2nd is the PFX password.

Chilkat.Imap imap = new Chilkat.Imap();

imap.Ssl = true;
imap.Port = 993;

success = imap.Connect("imap.example.com");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

success = imap.Login("user@example.com","myPassword");
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

//  Load the PFX data into a BinData.
Chilkat.BinData bdPfx = new Chilkat.BinData();
success = bdPfx.LoadFile("qa_data/smime.pfx");
if (success == false) {
    Debug.WriteLine(bdPfx.LastErrorText);
    return;
}

//  The PFX password is not hard-coded in source.  Insert code here to obtain it from an
//  interactive prompt, environment variable, or a secrets vault.
string pfxPassword;

//  Add the PFX as a source for S/MIME certificates and private keys.  Call once per source.
success = imap.AddPfxSourceBd(bdPfx,pfxPassword);
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}

//  Messages downloaded after this are automatically decrypted when a matching key is found.

success = imap.Disconnect();
if (success == false) {
    Debug.WriteLine(imap.LastErrorText);
    return;
}