macro_rules! impl_state {
($state:ident, $rate:ident, $buffer:ty, $padding:ty) => {
#[allow(non_camel_case_types)]
#[derive(Clone, Default)]
pub struct $state {
state: Sha3State,
buffer: $buffer,
}
impl $state {
fn absorb(&mut self, input: &[u8]) {
let self_state = &mut self.state;
self.buffer.input(input, |b| self_state.absorb_block(b));
}
fn apply_padding(&mut self) {
let buf = self.buffer.pad_with::<$padding>();
self.state.absorb_block(buf);
}
}
}
}
macro_rules! sha3_impl {
(
$state:ident, $output_size:ident, $rate:ident,
$buffer:ty, $padding:ty
) => {
impl_state!($state, $rate, $buffer, $padding);
impl digest::BlockInput for $state {
type BlockSize = $rate;
}
impl digest::Input for $state {
fn process(&mut self, data: &[u8]) {
self.absorb(data)
}
}
impl digest::FixedOutput for $state {
type OutputSize = $output_size;
fn fixed_result(mut self) -> GenericArray<u8, Self::OutputSize> {
self.apply_padding();
let mut out = GenericArray::default();
let n = out.len();
self.state.as_bytes(|state| {
out.copy_from_slice(&state[..n]);
});
out
}
}
impl_opaque_debug!($state);
}
}
macro_rules! shake_impl {
($state:ident, $rate:ident, $buffer:ty, $padding:ty) => {
impl_state!($state, $rate, $buffer, $padding);
impl digest::Input for $state {
fn process(&mut self, data: &[u8]) {
self.absorb(data)
}
}
impl digest::ExtendableOutput for $state {
type Reader = Sha3XofReader;
fn xof_result(mut self) -> Sha3XofReader
{
self.apply_padding();
Sha3XofReader::new(self.state, $rate::to_usize())
}
}
impl_opaque_debug!($state);
}
}