luhn

Documentation

Overview

Package luhn generates and validates Luhn mod N check digits.

Index

• type Alphabet
  • func (a Alphabet) Generate(s string) (rune, error)
  • func (a Alphabet) Validate(s string) bool

Types

type Alphabet

type Alphabet string

An alphabet is a string of N characters, representing the digits of a given base N.

var (
	Base32 Alphabet = "ABCDEFGHIJKLMNOPQRSTUVWXYZ234567"
)

func (Alphabet) Generate

func (a Alphabet) Generate(s string) (rune, error)

Generate returns a check digit for the string s, which should be composed of characters from the Alphabet a.

func (Alphabet) Validate

func (a Alphabet) Validate(s string) bool

Validate returns true if the last character of the string s is correct, for a string s composed of characters in the alphabet a.