On Fri, Jan 15, 2016 at 10:05 AM, Philippe Levesque <p_levesque555 at hotmail.com> wrote: > Hi > > I wanted some input on a problem. I need to use bn_exp for some big > calculation but I hit a limit where it take age to get a result (after two > day I stopped the process). Pure exponentiations without a modular reduction can quickly spill into the page file. It brings a machine to its knees because of memory growth, > I tried for fun to run a bn_mod_exp and it took > 2 seconds. Yes, usually a much better choice. > Is there a tip there to get the exp result from bn_mod_exp ? or to optimize > bn_exp ? bn_mod_exp computes r = a^p mod n. You already have the exponent (p) and you get the result (r). What are you trying to accomplish? Can you sketch the pseudo-code? Jeff
