(Swift 3,4,5...) RSA Encrypt with Modulus and Exponent

Demonstrates how to RSA encrypt with a given modulus and exponent.

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func chilkatTest() {
    // This example assumes the Chilkat API to have been previously unlocked.
    // See Global Unlock Sample for sample code.

    let rsa = CkoRsa()!

    // Assuming you already have a base64 modulus and exponent,
    // wrap it in XML like this:
    var modulus: String? = "qMBRpdYrAy5aMmo31NErUizh5sbweguSmh4wlK6uJEIDl+kwTlROnE34KOFExeTbJSX0WygPi+vWl0yNq7buIMUKpytossAAWut5khO3CQJxTk7G2gnEPNUUXHiExGgNrLzcSLv8YIlfVALhoRWyC67KOL+a+3taNq3h+BHeWhM="
    var exponent: String? = "AQAB"

    let xml = CkoXml()!
    xml.tag = "RSAPublicKey"
    xml.newChild2("Modulus", content: modulus)
    xml.newChild2("Exponent", content: exponent)

    // Encrypt with the public key.
    var publicKey: String? = xml.getXml()
    var success: Bool = rsa.importPublicKey(publicKey)

    var usePrivateKey: Bool = false
    var plainText: String? = "message in a bottle"

    rsa.encodingMode = "base64"
    var encryptedStrBase64: String? = rsa.encryptStringENC(plainText, bUsePrivateKey: usePrivateKey)
    print("\(encryptedStrBase64!)")

}