(Swift 3,4,5...) Duplicate PHP RSA Encryption

Demonstrates how to duplicate the following PHP function.

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

    // Duplicate the following PHP code:
    // 
    //    public function encryptRSA($plainText,$rsaMOD,$pubKEY){
    //         $rsa  = new RSA();
    //         $rsa->setEncryptionMode(RSA::ENCRYPTION_PKCS1);
    //         $publicKey = [
    //             'e' => new BigInteger($pubKEY,16),
    //             'n' => new BigInteger($rsaMOD,16)
    //         ];
    // 		
    //         $rsa->loadKey($publicKey);
    //         $ciphertext = $rsa->encrypt($plainText);
    //         return bin2hex($ciphertext);
    //     }
    // 
    //     $plainText="key=abcdefghijkmnopq&iv=abcdefghijkmnopq&h=12345678&s=12345678"
    //     $rsaMOD="F0946D8F05604809E24B8CFFD30349CEA9E5F4D320BFD9E9AA1B088863F02C43E7997D37A3E27B4F8F359F1744DB6B20A437067C0D325A80660D12FF56A57673"
    //     $pubKEY="010001"

    // We have the RSA modulus in hex
    var rsaMOD: String? = "F0946D8F05604809E24B8CFFD30349CEA9E5F4D320BFD9E9AA1B088863F02C43E7997D37A3E27B4F8F359F1744DB6B20A437067C0D325A80660D12FF56A57673"

    // The RSA exponent in hex is "010001", which is 65537 in decimal.  It's typically the exponent that is always used.
    var rsaEXP: String? = "010001"

    // Get the RSA modulus and exponent in base64.
    let bdMod = CkoBinData()!
    let bdExp = CkoBinData()!
    var success: Bool = bdMod.appendEncoded(rsaMOD, encoding: "hex")
    success = bdExp.appendEncoded(rsaEXP, encoding: "hex")

    // Build the XML representation of the RSA public key
    let xml = CkoXml()!
    xml.tag = "RSAPublicKey"
    xml.updateChildContent("Modulus", value: bdMod.getEncoded("base64"))
    xml.updateChildContent("Exponent", value: bdExp.getEncoded("base64"))

    // Load the RSA public key into a Chilkat public key object.
    let pubkey = CkoPublicKey()!
    success = pubkey.load(from: xml.getXml())

    // Setup the RSA object for encryption and do it..
    let rsa = CkoRsa()!
    rsa.verboseLogging = true
    success = rsa.importPublicKeyObj(pubkey)

    // Use PKCSv1.5 padding
    rsa.oaepPadding = false

    // Encrypt and return the string as hex.
    rsa.encodingMode = "hex"
    var plainText: String? = "key=abcdefghijkmnopq&iv=abcdefghijkmnopq&h=12345678&s=12345678"
    var cipherText: String? = rsa.encryptStringENC(plainText, bUsePrivateKey: false)
    if rsa.lastMethodSuccess == false {
        print("\(rsa.lastErrorText!)")
        return
    }

    // Note: The PKCSv1_5 padding incorporates random bytes.  Therefore, the RSA encryption will produce different results each time -- all of which are valid 
    // and decrypt correctly to the same original text.
    print("\(cipherText!)")

}