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 {
    let mut digits: Vec<u8> = (0..8).map(|_| rng.gen_range(0..=9)).collect();
    let mut checksum = 10;
    for &d in &digits {
        checksum = (checksum + d as u32) % 10;
        if checksum == 0 {
            checksum = 10;
        }
        checksum = (checksum * 2) % 11;
    }
    let check = (11 - checksum) % 10;
    digits.push(check as u8);
    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() != 9 {
        return false;
    }
    let digits: Vec<u8> = clean.bytes().map(|b| b - b'0').collect();
    let mut checksum = 10;
    for &d in &digits[..8] {
        checksum = (checksum + d as u32) % 10;
        if checksum == 0 {
            checksum = 10;
        }
        checksum = (checksum * 2) % 11;
    }
    let expected = (11 - checksum) % 10;
    expected == digits[8] as u32
}