goluhn: A luhn number generator, validator and calculator in Go

The Luhn algorithm or Luhn formula, also known as the "modulus 10" or "mod 10" algorithm, named after its creator, IBM scientist Hans Peter Luhn, is a simple checksum formula used to validate a variety of identification numbers.

goluhn is a package that is able to:

• Validate a number to see if it is valid according to the luhn algorithm
• Calculate luhn check digits for a given number
• Generate random luhn numbers of any size

How to use goluhn

Validation

err := goluhn.Validate("1111222233334444")
if err != nil {
  return err
}

Calculation

The Calculate function returns the luhnCheckDigit, the luhnNumber (input number + check digit) or an error

cd, n, err := goluhn.Calculate("111122223333444")
if err != nil {
  return err
}

fmt.Printf("Check digit: %s\n", cd)
fmt.Printf("Luhn number: %s\n", n)

Generation

The Generate function returns a random luhn number of a provided size.

n, err := goluhn.Generate(9)
if err != nil {
  return err
}

fmt.Printf("Luhn number: %s\n", n)

References

Luhn algorithm on wikipedia