hashing a small number to a random looking 64 bit integer

Question

I am looking for a hash-function which operates on a small integer (say in the range 0...1000) and outputs a 64 bit int.

The result-set should look like a random dis

Answer 1

Why not use an existing hash function, such as MurmurHash3 with a 64-bit finalizer? According to the author, the function takes tens of CPU cycles per key on current Intel hardware.