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use crypto::sha3::Sha3;
use crypto::digest::Digest;
pub fn to_bytes(n: u64) -> Vec<u8> {
let mut n = n;
let mut v = Vec::new();
for _i in 0..4{
v.push((n & 255) as u8);
n = n >> 8;
}
v
}
pub fn hex_to_bytes(string: &str) -> Vec<u8> {
let mut bytes = Vec::with_capacity(string.len()/2);
for i in 0..(string.len() / 2) {
match u8::from_str_radix(&string[2 * i.. 2 * i + 2], 16) {
Ok(n) => bytes.push(n),
Err(_) => panic!("Error in hex conversion"),
}
}
bytes
}
pub fn xor(s1: &[u8], s2: &[u8]) -> Vec<u8> {
s1.iter().zip(s2).map(|(x, y)| x ^ y).collect()
}
pub fn swap(block: &[u8]) -> Vec<u8> {
let l = &block[0..32];
let mut r = (&block[32..]).to_vec();
r.extend_from_slice(l);
r
}
pub fn hash(block: &[u8], key: &[u8]) -> Vec<u8> {
let mut hasher = Sha3::sha3_256();
let mut round_block = block.to_vec();
round_block.extend_from_slice(key);
hasher.input(&round_block);
hex_to_bytes(&hasher.result_str())
}
#[cfg(test)]
mod test{
use super::*;
#[test]
fn test_to_bytes(){
assert_eq!(vec![1,0,0,0], to_bytes(1));
assert_eq!(vec![0,1,0,0], to_bytes(256), "{:?}, {:?}", vec![1,1,0,0], to_bytes(256));
assert_eq!(vec![0,0,2,1], to_bytes(16908288), "{:?}, {:?}", vec![1,1,0,0], to_bytes(256));
assert_eq!(vec![255,255,255,255], to_bytes(4294967295), "{:?}, {:?}", vec![1,1,0,0], to_bytes(256));
}
}