A simple tool to convert serial numbers into another number that looks like random number.
It uses modular multiplicative inverse to build a bijection function and its inverse function. The domain and codomain of both functions are n-digit integer (0 ~ 10^n-1, inclusive).
Usage
// integer
a := fakerng.MustRawConverter(4, 9529)
a.Enc(9991) // returns 4720
a.Dec(4720) // returns 9991
// string
str, err := a.Encode("9991") // returns "4720"
str, err := a.Decode("4720") // returns "9991"
// more digits (12 digits
b := fakerng.New(
fakerng.MustRawConverter(6, 910110),
fakerng.MustRawConverter(6, 977691),
)
str, err := b.Encode("000000002278") // returns "910110177871"
str, err := b.Decode("910110177871") // returns "000000002278"
// multiple pass to increase randomness (5 pass)
c := fakerng.NewNPass(
fakerng.New(
fakerng.MustRawConverter(4, 9566),
),
fakerng.New(
fakerng.MustRawConverter(4, 9456),
),
fakerng.New(
fakerng.MustRawConverter(4, 9247),
),
fakerng.New(
fakerng.MustRawConverter(4, 9953),
),
fakerng.New(
fakerng.MustRawConverter(4, 9683),
),
)
str, err := c.Encode("9991") // returns "5373"
str, err := c.Decode("5373") // returns "9991"
There's a tool to generate codes above for you.
go get -u github.com/raohwork/fakerng
fakerng -h
License
This software is subject to the terms of the Mozilla Public License, v. 2.0. If a copy of the MPL was not distributed with this file, You can obtain one at Mozilla MPL.