Swift

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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func chilkatTest() {
    var success: Bool = 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.

    let imap = CkoImap()!

    imap.ssl = true
    imap.port = 993

    success = imap.connect(hostname: "imap.example.com")
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    success = imap.login(login: "user@example.com", password: "myPassword")
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

    //  Load the PFX data into a BinData.
    let bdPfx = CkoBinData()!
    success = bdPfx.loadFile(path: "qa_data/smime.pfx")
    if success == false {
        print("\(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.
    var pfxPassword: String?

    //  Add the PFX as a source for S/MIME certificates and private keys.  Call once per source.
    success = imap.addPfxSourceBd(bd: bdPfx, password: pfxPassword)
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }

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

    success = imap.disconnect()
    if success == false {
        print("\(imap.lastErrorText!)")
        return
    }


}