Reversible hash function?

I need a reversible hash function (obviously the input will be much smaller in size than the output) that maps the input to the output in a random-looking way. Basically, I want a way to transform a number like “123” to a larger number like “9874362483910978”, but not in a way that will preserve comparisons, so it must not be always true that, if x1 > x2, f(x1) > f(x2) (but neither must it be always false).

OpenCV 3.0 LineIterator

I want to use the LineIterator in OpenCV 3.0 using Python, is it still available with OpenCV 3.0 built for Python? It seems that the answers on the internet are all pointing to cv.InitLineIterator which is part of the cv module. I’ve tried importing this module but it seems like it is not included with the current build. Has it been renamed or strictly just removed?