Controlling PayloadLength

[scopedog]

I need to make PayloadLength to pass to CxPlatEncrypt divisible by 256 or 128.
What is the best way to do that?
Thank you.

[nibanks]

We don't have a way to control that. Why do you need to do that?

[scopedog]

Thank you for your reply.
I have implemented a new encryption algorithm and the best payload size is 256 (or 128) * N.