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b/src/main.rs @@ -0,0 +1,68 @@ +use rand::Rng; +use rand::rngs::OsRng; +use std::fs; + +// enum variant (i keep forgetting the terminology) +// enum PasswordType { +// RandomChars(usize), +// Passphrase(usize, usize), +// } + +// non-CTRL chars +fn random_ascii() -> u8 { + // we definitely want to use the OS for randomness + // doesn't require seeding because it is backed by CSPRNG, backed by OS + // the OS maintains it's own entropy from mouse movement, hardware noise,etc + let mut rng = OsRng; + + // NOT IDEAL FOR CRYPTO/password generation + // let range_max = 122; // 125 - 33 + // let n = rng.next_u32() % range_max; // slightly modulo biased + // (n + 33) as u8 + + // this function under the hood creates a zone that divides evenly + // into the range so we don't encounter modulo bias + rng.gen_range(33..125) as u8 +} + +fn generate_random_chars(len: usize) -> String { + // String is a thin wrapper around Vec so we can expect re-allocation + // and copy only when we exceed the capacity of the vector + let mut res = String::new(); + for _ in 0..len { + res.push(random_ascii() as char); + } + res +} + +fn generate_passphrase(phrases: usize, len: usize, words: &Vec<&str>) -> String { + let mut res = String::new(); + let mut count = 0; + while count < phrases { + let word = random_word(words); + if word.is_ascii() { // only add ascii words + res.push_str(random_word(words)); + count += 1; + } + } + res.truncate(len); // only works on ascii + res +} + +fn random_word<'a>(words: &'a Vec<&'a str>) -> &'a str { + let mut rng = OsRng; + words[rng.gen_range(0..words.len())] +} + + +fn main() { + let content = fs::read_to_string("/usr/share/dict/words") + .expect("could not read dictionary"); + let words: Vec<&str> = content.lines().collect(); + + let chars = generate_random_chars(20); + println!("generated random chars: {}", chars.as_str()); + + let phrase = generate_passphrase(3, 20, &words); + println!("generated passphrase: {}", phrase.as_str()); +}