Bypassing rar passwords?

*sigh*

Have you even tried searching for the answer to this on your own..?

You're a programmer, right? So, why don't you just take a look at the UnRAR sourcecode and answer your own question: hxxp://www.win-rar.com/index.php?aid=extras What could be easier?

Look for yourself to see how the password check is implemented instead of waiting on someone here to do the work for you and explain it to you, and maybe you will learn something in the process.