ank/avarus
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used encryption to mix the bag

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This commit is contained in:
Andy Killorin 2023-12-16 12:11:53 -06:00
parent a657d2754e
commit 092e878db6
Signed by: ank
GPG key ID: B6241CA3B552BCA4
1 changed files with 20 additions and 13 deletions
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33
server/src/names.rs
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@ -1,5 +1,6 @@
use anyhow::Context;
use bit_struct::*;
use feistel_rs::{feistel_encrypt, feistel_decrypt};
bit_struct! {
pub struct Name(u32) {
@ -10,6 +11,10 @@ bit_struct! {
}
}
// used as a aesthetic hash, not crypto
const FEISTEL_KEY: [u8; 2] = [242, 199];
const FEISTEL_ROUNDS: u32 = 42;
const FIRST_NAMES: &str = include_str!("../names.txt");
const LAST_NAMES: &str = include_str!("../surnames.txt");
const ORDER: &str = include_str!("../order.txt");
@ -18,7 +23,9 @@ const PRONOUNS: &str = include_str!("../pronouns.txt");
impl Name {
pub fn from_str(name: &str) -> anyhow::Result<Self> {
let parts: Vec<&str> = name.splitn(4, ' ').collect();
let (first, last, order, pronouns) = (parts[0], parts[1], parts[2], parts[3]);
let (first, last, order, mut pronouns) = (parts[0], parts[1], parts[2], parts[3]);
pronouns = &pronouns[1..pronouns.len()-1];
let first = FIRST_NAMES.lines().position(|x| *x == *first).map(|n| u13::new(n as u16)).context("unknown first name")?;
let last = LAST_NAMES.lines().position(|x| *x == *last).map(|n| u14::new(n as u16)).context("unknown last name")?;
@ -36,14 +43,22 @@ impl Name {
}
pub fn from_num(name: u32) -> Self {
// This is ok because every possible value is valid
let encrypted = u32::from_le_bytes(
feistel_encrypt(&name.to_le_bytes(), &FEISTEL_KEY, FEISTEL_ROUNDS).try_into().unwrap()
);
// This is ok because every possible value is valid (see tests)
unsafe {
Name(UnsafeStorage::new_unsafe(name))
Name(UnsafeStorage::new_unsafe(encrypted))
}
}
pub fn to_num(self) -> u32 {
self.raw()
let num = self.raw();
u32::from_le_bytes(
feistel_decrypt(&num.to_le_bytes(), &FEISTEL_KEY, FEISTEL_ROUNDS).try_into().unwrap()
)
}
pub fn to_str(&mut self) -> String {
@ -52,15 +67,7 @@ impl Name {
let order = ORDER.lines().nth(self.order().get().value() as usize).unwrap();
let pronouns = PRONOUNS.lines().nth(self.pronouns().get().value() as usize).unwrap();
let mut name = String::new();
name.push_str(first);
name.push(' ');
name.push_str(last);
name.push(' ');
name.push_str(order);
name.push(' ');
name.push_str(pronouns);
name
format!("{first} {last} {order} ({pronouns})")
}
}