(Swift 3,4,5...) RSA Signature SHA256withRSA, iso-8859-1, base64

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RSA sign the iso-8859-1 byte representation of a string with SHA256withRSA, and return the signature in the base64 encoding.

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

    // This example will duplicate the following Java code:
    // 
    // Signature sign = Signature.getInstance("SHA256withRSA");
    // sign.initSign(privateKey);
    // sign.update(original.getBytes(Charset.forName("ISO-8859-1")));
    // 
    // ...
    // byte[] resultado = sign.sign();
    // sello = encodeByteArrayToBase64(resultado);
    // 

    // Load an RSA private key for signing.
    // You can load any format file.  This example loads a .pem, but you can provide path to any type of file holding a private key.
    let privKey = CkoPrivateKey()!
    var success: Bool = privKey.loadAnyFormatFile("qa_data/pem/rsa_passwd.pem", password: "passwd")
    if success != true {
        print("\(privKey.lastErrorText!)")
        return
    }

    let rsa = CkoRsa()!
    rsa.importPrivateKeyObj(privKey)

    var originalData: String? = "This is the string to be hashed an RSA signed."

    // Indicate that we want the iso-8859-1 byte representation of the string to be signed
    rsa.charset = "iso-8859-1"

    // We want the RSA signature in base64 format
    rsa.encodingMode = "base64"

    var sigBase64: String? = rsa.signStringENC(originalData, hashAlg: "sha256")
    print("\(sigBase64!)")

}