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use io;
use rand::Rng;
pub struct OsRng {
state: [u64; 2]
}
impl OsRng {
pub fn new() -> io::Result<OsRng> {
Ok(OsRng {
state: [0xBADF00D1, 0xDEADBEEF]
})
}
}
impl Rng for OsRng {
fn next_u32(&mut self) -> u32 {
self.next_u64() as u32
}
fn next_u64(&mut self) -> u64 {
let mut x = self.state[0];
let y = self.state[1];
self.state[0] = y;
x ^= x << 23;
self.state[1] = x ^ y ^ (x >> 17) ^ (y >> 26);
self.state[1].wrapping_add(y)
}
fn fill_bytes(&mut self, buf: &mut [u8]) {
for chunk in buf.chunks_mut(8) {
let mut rand: u64 = self.next_u64();
for b in chunk.iter_mut() {
*b = rand as u8;
rand = rand >> 8;
}
}
}
}