idsmith 0.5.4

Validate and generate checksum-correct IBANs, personal IDs, bank accounts, credit cards, SWIFT/BIC, company IDs, driver's licenses, tax IDs, and passports.
Documentation 
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use rand::Rng;

pub fn generate(rng: &mut rand::rngs::ThreadRng) -> String {
    loop {
        let digits: Vec<u8> = (0..8).map(|_| rng.gen_range(0..=9)).collect();
        let weights = [1, 2, 1, 2, 1, 2, 4, 1];
        let sum: u32 = digits
            .iter()
            .zip(weights.iter())
            .map(|(&d, &w)| {
                let p = d as u32 * w as u32;
                p / 10 + p % 10
            })
            .sum();
        if sum.is_multiple_of(10) || (sum % 10 == 9 && digits[6] == 7) {
            return digits.iter().map(|d| (b'0' + d) as char).collect();
        }
    }
}

pub fn validate(code: &str) -> bool {
    let clean: String = code.chars().filter(|c| c.is_ascii_digit()).collect();
    if clean.len() != 8 {
        return false;
    }
    let digits: Vec<u8> = clean.bytes().map(|b| b - b'0').collect();
    let weights = [1, 2, 1, 2, 1, 2, 4, 1];
    let sum: u32 = digits
        .iter()
        .zip(weights.iter())
        .map(|(&d, &w)| {
            let p = d as u32 * w as u32;
            p / 10 + p % 10
        })
        .sum();
    sum.is_multiple_of(10) || (sum % 10 == 9 && digits[6] == 7)
}