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use bs58;
use itertools::Itertools;
use sha3::{digest::*, Shake256};
pub struct KeyGenerator {
password_digest: String,
hasher: Shake256,
}
impl KeyGenerator {
pub fn new(password: String) -> Self {
let mut hasher = Shake256::default();
hasher.update(password);
let password_digest = hasher.finalize_boxed_reset(64);
Self {
password_digest: bs58::encode(password_digest.into_vec()).into_string(),
hasher,
}
}
pub fn gen(
&mut self,
nickname: String,
key_length: usize,
additional_characters: Vec<char>,
) -> String {
let password_digest = &self.password_digest;
let source = key_length.to_string() + password_digest + &nickname;
self.hasher.update(source);
let result = self.hasher.finalize_boxed_reset(64);
let mut encoded = bs58::encode(result.into_vec()).into_string();
encoded.truncate(key_length);
let char_counts = encoded.chars().counts();
for (from, to) in char_counts
.into_iter()
.sorted()
.zip(additional_characters.into_iter())
{
encoded = encoded.replace(&String::from(from.0), &String::from(to));
}
encoded
}
}
#[cfg(test)]
mod test {
use crate::*;
#[test]
fn test_hasher() {
let mut key_gen =
KeyGenerator::new(String::from("My very very long rememberable password!!!!!"));
let key_length = 16;
let key = key_gen.gen(
String::from("nickname of a service or something that I can remember"),
key_length,
vec!['!', '#'],
);
assert_eq!(key, "!X#Lbepf8fUz9Sa#");
}
}