luhn-rs

This project allows generating and verifying Luhn check digits and using arbitrary alphabets.

Example

Add this to your Cargo.toml:

[dependencies] luhn-rs = "0.0.1"

Then, in your crate:

```rust extern crate luhn;

use luhn::Luhn; ```

Generating a check digit:

```rust // The alphabet given dictates what input characters are allowed. let l = Luhn::new("abcdef").expect("invalid alphabet given");

let ch = l.generate("abcdef") { Ok(ch) => ch, Err(e) => panic!("unexpected generate error: {:?}", e), };

println!("the luhn check digit is: {}", ch); ```

Verifying a check digit (this uses the last character in the string as the check digit):

```rust let l = Luhn::new("abcdef").expect("invalid alphabet given");

println!("validating 'abcdefe': {}", l.validate("abcdefe").unwrap()); println!("validating 'abcdefa': {}", l.validate("abcdefe").unwrap()); ```

MIT