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use ffi;
use std::mem;
pub fn auth(message: &[u8], key: [u8; 32]) -> [u8; 16] {
unsafe {
let mut mac: [u8; 16] = mem::uninitialized();
ffi::crypto_poly1305(
mac.as_mut_ptr(),
message.as_ptr(),
message.len(),
key.as_ptr(),
);
mac
}
}
pub struct Context(ffi::crypto_poly1305_ctx);
impl Context {
#[inline]
pub fn new(key: [u8; 32]) -> Context {
unsafe {
let mut ctx = mem::uninitialized();
ffi::crypto_poly1305_init(&mut ctx, key.as_ptr());
Context(ctx)
}
}
#[inline]
pub fn update(&mut self, message: &[u8]) {
unsafe {
ffi::crypto_poly1305_update(&mut self.0, message.as_ptr(), message.len());
}
}
#[inline]
pub fn finalize(&mut self) -> [u8; 16] {
unsafe {
let mut mac: [u8; 16] = mem::uninitialized();
ffi::crypto_poly1305_final(&mut self.0, mac.as_mut_ptr());
mac
}
}
}
#[cfg(test)]
mod test {
use super::*;
#[test]
fn auth() {
let key = [1u8; 32];
let mac = ::poly1305::auth("test".as_bytes(), key);
assert_eq!(mac, [20, 62, 33, 196, 79, 94, 80, 79, 78, 94, 80, 79, 78, 94, 80, 79])
}
#[test]
fn ctx() {
let key = [2u8; 32];
let mut ctx = Context::new(key);
ctx.update("test".as_bytes());
let mac = ctx.finalize();
assert_eq!(mac,
[40, 124, 66, 136, 159, 188, 160, 158, 156, 188, 160, 158, 156, 188, 160, 158])
}
}