stuff.rs

extern mod std;
use std::base64::ToBase64;
use core::str::Clone;

fn hex_to_base64(source: &str) -> ~str {
  let bytes = str::to_bytes(source);
  let mut nums: ~[u8] = ~[];

  for uint::range_step(0, bytes.len(), 2) |i| {
    let num = u8::parse_bytes(bytes.slice(i, i+2), 16);
    match num { Some(n) => nums.push(n), None => () }
  }

  nums.to_base64()
}


fn xor_sum(message: &str, cypher: &str) -> ~str {

  let bytes  = str::to_bytes(message);
  let bytes2 = str::to_bytes(cypher);

  let hex : @mut ~str = @mut ~"";

  for uint::range_step(0, bytes.len(), 2) |i| {
    let num  = u8::parse_bytes( bytes.slice(i, i+2), 16);
    let num2 = u8::parse_bytes(bytes2.slice(i, i+2), 16);
    chain(num, |a| {
    chain(num2, |b| {
      hex.push_str(u8::to_str_radix((a ^ b), 16));
      Some(a) 
    }) })
  }

  (*hex).clone()
}


#[test]
fn test_xor_sum() {
  let input1 = ~"1c0111001f010100061a024b53535009181c";
  let input2 = ~"686974207468652062756c6c277320657965";

  let expected = ~"746865206b696420646f6e277420706c6179";

  assert_eq!(xor_sum(input1, input2), expected);
}

#[test]
fn test_hex_to_base64() {
  let input = ~"49276d206b696c6c696e6720796f757220627261696e206c696b65206120706f69736f6e6f7573206d757368726f6f6d";
  let expected = ~"SSdtIGtpbGxpbmcgeW91ciBicmFpbiBsaWtlIGEgcG9pc29ub3VzIG11c2hyb29t";
  let outcome = hex_to_base64(input);

  assert_eq!(outcome, expected);
}

fn main() {
}