Tord Ingolf Reistad <to...@stud.ntnu.no> writes: Hi Tord
> I have a simple question: After completing a VIFF program I have > opened the shares and gotten the results, but the results are field > elements (probably elements of class GFElement), how do I turn them > back into integers? You just access the value attribute of your GFElement: x.value. If you update to the very latest version of VIFF you can now also use int(x) to do the same. > The documentation says nothing about how to turn them back into > integers, which should be essencial if I am going to use these > shares in other applications. There seems to be some code __repr__ > in GFElements, but I cannot see how I can use it. That method is called when x is a field element and you do "foo %r bar" % x or repr(x) It just produces a string with the value. > As an additional problem, the integers should not be integers in the > set form 0 to p-1, but integers from -(p-1)/2 to +(p-1)/2. How > should one do that efficiently? That should be as simple as x.value - (x.modulus - 1) // 2 -- Martin Geisler VIFF (Virtual Ideal Functionality Framework) brings easy and efficient SMPC (Secure Multiparty Computation) to Python. See: http://viff.dk/. _______________________________________________ viff-devel mailing list (http://viff.dk/) viff-devel@viff.dk http://lists.viff.dk/listinfo.cgi/viff-devel-viff.dk
