Sha256: 29be34618a99698b543abf2ea4cea0ac14d0b937e39f880ee6e45f071ec0dc6d
Contents?: true
Size: 1.01 KB
Versions: 29
Compression:
Stored size: 1.01 KB
Contents
extern crate rand;
use rand::Rng;
pub fn encode_random(s: &str) -> (String, String) {
let mut r = rand::thread_rng();
let mut key = String::new();
for _ in 0..100 {
key.push(char::from('a' as u8 + r.gen_range(0, 26)));
}
let encoded = encode(&key, s);
(key, encoded.unwrap())
}
pub fn encode(key: &str, s: &str) -> Option<String> {
shift(key, s, 1)
}
pub fn decode(key: &str, s: &str) -> Option<String> {
shift(key, s, -1)
}
fn shift(key: &str, s: &str, dir: i8) -> Option<String> {
if key.is_empty() {
return None;
}
let mut o = String::new();
let mut i = 0;
let mut key_arr = Vec::new();
for c in key.chars() {
if !c.is_ascii_lowercase() {
return None;
}
key_arr.push(c);
}
for c in s.chars() {
let shift = key_arr[i % key_arr.len()] as i8 - 'a' as i8;
let n = ((c as i8 - 'a' as i8 + dir * shift) % 26 + 26) % 26;
o.push(char::from('a' as u8 + n as u8));
i += 1;
}
Some(o)
}
Version data entries
29 entries across 29 versions & 1 rubygems