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

Given: input i in the range of 0 to 1,000.

const MaxInt which is the maximum value that cna be contained in a 64 bit int. (you did not say if it is signed or unsigned; 2^64 = 18446744073709551616 )

and a function rand() that returns a value between 0 and 1 (most languages have such a function)

compute hashvalue = i * rand() * ( MaxInt / 1000 )