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use std::convert::TryInto;
use std::fmt;
use std::marker::PhantomData;
use group::ff::Field;
use halo2_proofs::{
arithmetic::FieldExt,
circuit::{AssignedCell, Chip, Layouter},
plonk::Error,
};
mod pow5;
pub use pow5::{Pow5Chip, Pow5Config, StateWord};
pub mod primitives;
use primitives::{Absorbing, ConstantLength, Domain, Spec, SpongeMode, Squeezing, State};
#[derive(Clone, Debug)]
pub enum PaddedWord<F: Field> {
Message(AssignedCell<F, F>),
Padding(F),
}
pub trait PoseidonInstructions<F: FieldExt, S: Spec<F, T, RATE>, const T: usize, const RATE: usize>:
Chip<F>
{
type Word: Clone + fmt::Debug + From<AssignedCell<F, F>> + Into<AssignedCell<F, F>>;
fn permute(
&self,
layouter: &mut impl Layouter<F>,
initial_state: &State<Self::Word, T>,
) -> Result<State<Self::Word, T>, Error>;
}
pub trait PoseidonSpongeInstructions<
F: FieldExt,
S: Spec<F, T, RATE>,
D: Domain<F, RATE>,
const T: usize,
const RATE: usize,
>: PoseidonInstructions<F, S, T, RATE>
{
fn initial_state(&self, layouter: &mut impl Layouter<F>)
-> Result<State<Self::Word, T>, Error>;
fn add_input(
&self,
layouter: &mut impl Layouter<F>,
initial_state: &State<Self::Word, T>,
input: &Absorbing<PaddedWord<F>, RATE>,
) -> Result<State<Self::Word, T>, Error>;
fn get_output(state: &State<Self::Word, T>) -> Squeezing<Self::Word, RATE>;
}
#[derive(Debug)]
pub struct Word<
F: FieldExt,
PoseidonChip: PoseidonInstructions<F, S, T, RATE>,
S: Spec<F, T, RATE>,
const T: usize,
const RATE: usize,
> {
inner: PoseidonChip::Word,
}
impl<
F: FieldExt,
PoseidonChip: PoseidonInstructions<F, S, T, RATE>,
S: Spec<F, T, RATE>,
const T: usize,
const RATE: usize,
> Word<F, PoseidonChip, S, T, RATE>
{
pub fn inner(&self) -> PoseidonChip::Word {
self.inner.clone()
}
pub fn from_inner(inner: PoseidonChip::Word) -> Self {
Self { inner }
}
}
fn poseidon_sponge<
F: FieldExt,
PoseidonChip: PoseidonSpongeInstructions<F, S, D, T, RATE>,
S: Spec<F, T, RATE>,
D: Domain<F, RATE>,
const T: usize,
const RATE: usize,
>(
chip: &PoseidonChip,
mut layouter: impl Layouter<F>,
state: &mut State<PoseidonChip::Word, T>,
input: Option<&Absorbing<PaddedWord<F>, RATE>>,
) -> Result<Squeezing<PoseidonChip::Word, RATE>, Error> {
if let Some(input) = input {
*state = chip.add_input(&mut layouter, state, input)?;
}
*state = chip.permute(&mut layouter, state)?;
Ok(PoseidonChip::get_output(state))
}
#[derive(Debug)]
pub struct Sponge<
F: FieldExt,
PoseidonChip: PoseidonSpongeInstructions<F, S, D, T, RATE>,
S: Spec<F, T, RATE>,
M: SpongeMode,
D: Domain<F, RATE>,
const T: usize,
const RATE: usize,
> {
chip: PoseidonChip,
mode: M,
state: State<PoseidonChip::Word, T>,
_marker: PhantomData<D>,
}
impl<
F: FieldExt,
PoseidonChip: PoseidonSpongeInstructions<F, S, D, T, RATE>,
S: Spec<F, T, RATE>,
D: Domain<F, RATE>,
const T: usize,
const RATE: usize,
> Sponge<F, PoseidonChip, S, Absorbing<PaddedWord<F>, RATE>, D, T, RATE>
{
pub fn new(chip: PoseidonChip, mut layouter: impl Layouter<F>) -> Result<Self, Error> {
chip.initial_state(&mut layouter).map(|state| Sponge {
chip,
mode: Absorbing(
(0..RATE)
.map(|_| None)
.collect::<Vec<_>>()
.try_into()
.unwrap(),
),
state,
_marker: PhantomData::default(),
})
}
pub fn absorb(
&mut self,
mut layouter: impl Layouter<F>,
value: PaddedWord<F>,
) -> Result<(), Error> {
for entry in self.mode.0.iter_mut() {
if entry.is_none() {
*entry = Some(value);
return Ok(());
}
}
let _ = poseidon_sponge(
&self.chip,
layouter.namespace(|| "PoseidonSponge"),
&mut self.state,
Some(&self.mode),
)?;
self.mode = Absorbing::init_with(value);
Ok(())
}
#[allow(clippy::type_complexity)]
pub fn finish_absorbing(
mut self,
mut layouter: impl Layouter<F>,
) -> Result<Sponge<F, PoseidonChip, S, Squeezing<PoseidonChip::Word, RATE>, D, T, RATE>, Error>
{
let mode = poseidon_sponge(
&self.chip,
layouter.namespace(|| "PoseidonSponge"),
&mut self.state,
Some(&self.mode),
)?;
Ok(Sponge {
chip: self.chip,
mode,
state: self.state,
_marker: PhantomData::default(),
})
}
}
impl<
F: FieldExt,
PoseidonChip: PoseidonSpongeInstructions<F, S, D, T, RATE>,
S: Spec<F, T, RATE>,
D: Domain<F, RATE>,
const T: usize,
const RATE: usize,
> Sponge<F, PoseidonChip, S, Squeezing<PoseidonChip::Word, RATE>, D, T, RATE>
{
pub fn squeeze(&mut self, mut layouter: impl Layouter<F>) -> Result<AssignedCell<F, F>, Error> {
loop {
for entry in self.mode.0.iter_mut() {
if let Some(inner) = entry.take() {
return Ok(inner.into());
}
}
self.mode = poseidon_sponge(
&self.chip,
layouter.namespace(|| "PoseidonSponge"),
&mut self.state,
None,
)?;
}
}
}
#[derive(Debug)]
pub struct Hash<
F: FieldExt,
PoseidonChip: PoseidonSpongeInstructions<F, S, D, T, RATE>,
S: Spec<F, T, RATE>,
D: Domain<F, RATE>,
const T: usize,
const RATE: usize,
> {
sponge: Sponge<F, PoseidonChip, S, Absorbing<PaddedWord<F>, RATE>, D, T, RATE>,
}
impl<
F: FieldExt,
PoseidonChip: PoseidonSpongeInstructions<F, S, D, T, RATE>,
S: Spec<F, T, RATE>,
D: Domain<F, RATE>,
const T: usize,
const RATE: usize,
> Hash<F, PoseidonChip, S, D, T, RATE>
{
pub fn init(chip: PoseidonChip, layouter: impl Layouter<F>) -> Result<Self, Error> {
Sponge::new(chip, layouter).map(|sponge| Hash { sponge })
}
}
impl<
F: FieldExt,
PoseidonChip: PoseidonSpongeInstructions<F, S, ConstantLength<L>, T, RATE>,
S: Spec<F, T, RATE>,
const T: usize,
const RATE: usize,
const L: usize,
> Hash<F, PoseidonChip, S, ConstantLength<L>, T, RATE>
{
pub fn hash(
mut self,
mut layouter: impl Layouter<F>,
message: [AssignedCell<F, F>; L],
) -> Result<AssignedCell<F, F>, Error> {
for (i, value) in message
.into_iter()
.map(PaddedWord::Message)
.chain(<ConstantLength<L> as Domain<F, RATE>>::padding(L).map(PaddedWord::Padding))
.enumerate()
{
self.sponge
.absorb(layouter.namespace(|| format!("absorb_{}", i)), value)?;
}
self.sponge
.finish_absorbing(layouter.namespace(|| "finish absorbing"))?
.squeeze(layouter.namespace(|| "squeeze"))
}
}