obfidx v1.0.0

obfidx

Obfuscator for 32 bit integer.

Based on a sample script from Pseudo encrypt - Postgresql wiki, by Daniel Vérité and Jaka Jancar.

This function guarantees following property, within given range:

• output is uniquely associated to its integer input
• looks random
• zero collision

Additionally,

• it returns a signed integer (postgres doesn't have unsigned integers anyway).
• it's a self-inverse, that is: pseudo_encrypt(pseudo_encrypt(X)) = X
• the output may be customized by changing this function of r1

Usage

include/require obfidx js and:

obfidx = obfidx a, b, c
obfuscated-number = obfidx original-number

where a, b and c are some casual numbers used in following function:

f = ((a * R1 + b ) % c ) / c

which guarantee a output value of f(v) in 0 ~ 1, and for any x = y, f(x) = f(y).

License

MIT