Make some methods public in Cryptor

[jeyries]

This will open the cryptolib-swift library, for example for providing external Streams support

[tobihagemann]

I'm very sorry that I'm nitpicky about this but I wouldn't want to introduce breaking changes to the API if I'd have to revert this after the refactoring mentioned in #11. I don't have the full picture yet but I believe that the consumer of this API doesn't have to worry about the file header or even encrypting/decrypting single chunks. The changes have to be cohesive with the rest.

Since you have a very explicit use case and you already have a working solution, which is absolutely fine for you for now, you can just use your fork. We're actually doing this a lot and it's very straightforward with SPM. I understand that you'd prefer to have your changes upstream and I'm thankful for your contribution. If you want, I can give you a ping when I've implemented something that might be useful to you. I still think that your idea makes sense, it's just a question of API design that fits with the rest.

[jeyries]

Hi Tobias, sure I am currently using my own fork of cryptolib-swift .

This was just a matter of contributing to this open source library .

Let's keep in touch if you add support for Streams in cryptolib-swift ...