Add a Detached Signature (Separate Key, Header Control)

See more MIME Examples

Demonstrates the Chilkat Mime.AddDetachedSignaturePk2 method, which creates a detached signature with a separately supplied certificate and private key, and a third argument controlling transfer of the existing message header fields to the new outer entity.

Note: The file paths are relative to the application's current working directory. Absolute paths may also be used. Supply the paths appropriate to your own environment.

func chilkatTest() {
    var success: Bool = false

    let mime = CkoMime()!
    success = mime.setBody(fromPlainText: "This message will be signed.")
    if success == false {
        print("\(mime.lastErrorText!)")
        return
    }

    //  Load the certificate and its private key separately.
    let cert = CkoCert()!
    success = cert.load(fromFile: "qa_data/signer.cer")
    if success == false {
        print("\(cert.lastErrorText!)")
        return
    }

    let privKey = CkoPrivateKey()!
    success = privKey.loadPemFile(path: "qa_data/signer_privkey.pem")
    if success == false {
        print("\(privKey.lastErrorText!)")
        return
    }

    //  Create a detached signature with separately supplied cert and private key, where the 3rd
    //  argument controls whether the existing message header fields are transferred to the new outer
    //  multipart/signed entity.
    var transferHeaderFields: Bool = true
    success = mime.addDetachedSignaturePk2(cert: cert, privateKey: privKey, transferHeaderFields: transferHeaderFields)
    if success == false {
        print("\(mime.lastErrorText!)")
        return
    }

    success = mime.save(path: "qa_output/signed.eml")
    if success == false {
        print("\(mime.lastErrorText!)")
        return
    }

    print("Detached signature added (headers transferred).")

}