Invalid encryption

[danielgindi]

This code always appends a length int to the encrypted data, which is not part of the spec.
This makes it impossible to get valid XXTEA results.
Could you add an option for avoiding that?

[Berrysoft]

This code is, originally, a translation of JS version, with some optimization. If you find any inconsistency, fell free to point out. If you would like more features, I'm afraid I don't have enough time at present. You can fork the repo, or even copy the code to your project, along with the MIT license. Then you can add any features you'd like. It would be better for me if you would like to open a pull request for that.

[danielgindi]

Thank you, I'll try to make a PR for this soon.

I was actually trying to see what's on Nuget to migrate from an old .NET Framework lib of mine, but I had to migrate that piece of code to Standard when I found that this lib adda extra logic over the XXTEA.