Validates strings and computes check digits using the Luhn algorithm.
This is a fast, allocation and panic free crate for computing and validating Luhn checksum for decimal and alpha numeric sequences. This is my crate. There are many like it, but this one is mine.
It's not a great checksum, but it's used in a bunch of places: - credit card numbers - International Securities Identification Number (ISIN) codes - International Mobile Equipment Identity (IMEI) codes - Canadian Social Insurance Numbers
More information is available on wikipedia.
Add luhn3 under [dependencies] in your Cargo.toml:
toml
[dependencies]
luhn3 = "1.0"
Most of the CC numbers use Luhn checksum:
```rust // Visa luhn3::valid(b"4111111111111111"); // true
// MasterCard luhn3::valid(b"5555555555554444"); // true
// Invalid Visa luhn3::valid(b"4111111111111121"); // false ```
Library also allows to calculate a checksum if missing:
rust
// Take off the checksum from American Express card number
let (&check, body) = b"378282246310005".split_last().unwrap();
// and recalculate it
luhn3::checksum(body); // Some(b'5')
This library provides two sets of operation: [decimal] and [alphanum].
- decimal operates on sequences composed of decimal numbers only, such
as credit card numbers or IMEI codes
- alphanum operates on sequences composed of decimal numbers and capital latin letters, such
as ISIN or NSIN