how to generate PMK?

I would like to kn开发者_C百科ow how can I generate a random pre-master key PMK in java? (related in key exchange and authentication) Is it similar with other randam key generating? What particularly is a pre master key?

Thanks, Sebby.

It looks to me like you are trying to make your own crypto. If that's the case, please don't do it. That's the #1 crypto advice anyone will give you.

If you want to re-implement TLS or something similar, I suggest that you forget your attempt and use a well-tested library. If you MUST implement it, then please take the time to read the specs carefully. They will explain what each step is and how to compute it.

If the only thing you want to a a good bunch of random bytes, SecureRandom is the API to use.