finance_tokenizer 0.1.0

A finacne tokenization library
Documentation 
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use std::iter;
use rand::{Rng, thread_rng};
use rand::distributions::Alphanumeric;
use credit_card::CreditCard;

pub struct Tokenizer;
impl Tokenizer {
    /// creates a random salt with given length
    /// # Arguments
    /// * `length` - the length of string to return
    fn generate_salt(length: usize) -> String {
        let mut rng = thread_rng();
        iter::repeat(())
            .map(|()| rng.sample(Alphanumeric))
            .take(length)
            .collect()
    }

    /// creates a token for a given credit card
    /// # Arguments
    /// * `credit_card` - a credit card object to hash
    pub fn generate(credit_card: &CreditCard) -> String {
        let salt = Self::generate_salt(32);

        let security_code = credit_card.security_code.clone();


        let mut hasher = blake3::Hasher::new();
        hasher.update(credit_card.number.as_bytes());
        hasher.update(credit_card.cardholder_name.as_bytes());
        hasher.update(credit_card.expiration_month.as_bytes());
        hasher.update(credit_card.expiration_year.as_bytes());
        hasher.update(security_code.unwrap_or_default().as_bytes());
        hasher.update(salt.as_bytes());

        let digest = hasher.finalize();
        let hex_digest = digest.to_hex();
        hex_digest.to_string()
    }
}