Rust

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

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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// 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.

let imap = chilkat::Imap::new();

imap.set_ssl(true);
imap.set_port(993);

if imap.connect("imap.example.com").is_err() {
    println!("{}", imap.last_error_text());
    return;
}

if imap.login("user@example.com", "myPassword").is_err() {
    println!("{}", imap.last_error_text());
    return;
}

// Load the PFX data into a BinData.
let bd_pfx = chilkat::BinData::new();
if bd_pfx.load_file("qa_data/smime.pfx").is_err() {
    println!("{}", bd_pfx.last_error_text());
    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.
let pfx_password = String::new();

// Add the PFX as a source for S/MIME certificates and private keys.  Call once per source.
if imap.add_pfx_source_bd(&bd_pfx, &pfx_password).is_err() {
    println!("{}", imap.last_error_text());
    return;
}

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

if imap.disconnect().is_err() {
    println!("{}", imap.last_error_text());
    return;
}