(Swift 3,4,5...) Generate an RSA Key and Get as Base64 DER

Demonstrates how to generate a 2048-bit RSA key and return the public and private parts as unencrypted Base64 encoded DER.

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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()!

    // Generate a 2048-bit key.  Chilkat RSA supports
    var success: Bool = rsa.generateKey(2048)
    if success != true {
        print("\(rsa.lastErrorText!)")
        return
    }

    // Get the public part of the key.
    var pubKey: CkoPublicKey? = rsa.exportPublicKeyObj()

    // There are two possible formats for representing the RSA public key 
    // in ASN.1 (DER).  The possible formats are PKCS1 and PKCS8.
    // We can get either by setting bChoosePkcs1 to true or false.
    var bChoosePkcs1: Bool = true
    var pubKeyBase64Der: String? = pubKey!.getEncoded(bChoosePkcs1, encoding: "base64")
    print("Public Key Base64 DER:")
    print("\(pubKeyBase64Der!)")

    pubKey = nil

    // Now get the private key as Base64 DER:
    // Get the private part of the key.
    // (Note: A public key is actually just a subset of the private key.  
    //  If you have the private key, you also have the public key.
    //  Thus Chilkat provides a method to get the public key from the private key.)
    var privKey: CkoPrivateKey? = rsa.exportPrivateKeyObj()

    // Again, we can get PKCS1 or PKCS8, but with different methods:
    var privKeyPkcs1: String? = privKey!.getPkcs1ENC("base64")
    print("Private Key PKCS1 Base64 DER:")
    print("\(privKeyPkcs1!)")

    var privKeyPkcs8: String? = privKey!.getPkcs8ENC("base64")
    print("Private Key PKCS8 Base64 DER:")
    print("\(privKeyPkcs8!)")

    privKey = nil

}