mirror of https://github.com/zcash/halo2.git
321 lines
11 KiB
Rust
321 lines
11 KiB
Rust
use super::super::{util::*, AssignedBits, Bits, SpreadVar, SpreadWord, Table16Assignment};
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use super::{schedule_util::*, MessageScheduleConfig, MessageWord};
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use halo2_proofs::{
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circuit::{Region, Value},
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pasta::pallas,
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plonk::Error,
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};
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use std::convert::TryInto;
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// A word in subregion 3
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// (10, 7, 2, 13)-bit chunks
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pub struct Subregion3Word {
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index: usize,
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#[allow(dead_code)]
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a: AssignedBits<10>,
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b: AssignedBits<7>,
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c: AssignedBits<2>,
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#[allow(dead_code)]
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d: AssignedBits<13>,
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spread_a: AssignedBits<20>,
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spread_d: AssignedBits<26>,
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}
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impl Subregion3Word {
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fn spread_a(&self) -> Value<[bool; 20]> {
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self.spread_a.value().map(|v| v.0)
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}
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fn spread_b(&self) -> Value<[bool; 14]> {
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self.b.value().map(|v| v.spread())
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}
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fn spread_c(&self) -> Value<[bool; 4]> {
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self.c.value().map(|v| v.spread())
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}
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fn spread_d(&self) -> Value<[bool; 26]> {
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self.spread_d.value().map(|v| v.0)
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}
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fn xor_lower_sigma_1(&self) -> Value<[bool; 64]> {
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self.spread_a()
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.zip(self.spread_b())
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.zip(self.spread_c())
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.zip(self.spread_d())
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.map(|(((a, b), c), d)| {
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let xor_0 = b
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.iter()
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.chain(c.iter())
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.chain(d.iter())
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.chain(std::iter::repeat(&false).take(20))
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.copied()
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.collect::<Vec<_>>();
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let xor_1 = c
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.iter()
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.chain(d.iter())
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.chain(a.iter())
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.chain(b.iter())
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.copied()
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.collect::<Vec<_>>();
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let xor_2 = d
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.iter()
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.chain(a.iter())
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.chain(b.iter())
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.chain(c.iter())
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.copied()
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.collect::<Vec<_>>();
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let xor_0 = lebs2ip::<64>(&xor_0.try_into().unwrap());
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let xor_1 = lebs2ip::<64>(&xor_1.try_into().unwrap());
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let xor_2 = lebs2ip::<64>(&xor_2.try_into().unwrap());
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i2lebsp(xor_0 + xor_1 + xor_2)
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})
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}
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}
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impl MessageScheduleConfig {
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// W_[49..62]
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pub fn assign_subregion3(
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&self,
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region: &mut Region<'_, pallas::Base>,
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lower_sigma_0_v2_output: Vec<(AssignedBits<16>, AssignedBits<16>)>,
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w: &mut Vec<MessageWord>,
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w_halves: &mut Vec<(AssignedBits<16>, AssignedBits<16>)>,
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) -> Result<(), Error> {
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let a_5 = self.message_schedule;
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let a_6 = self.extras[2];
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let a_7 = self.extras[3];
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let a_8 = self.extras[4];
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let a_9 = self.extras[5];
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// Closure to compose new word
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// W_i = sigma_1(W_{i - 2}) + W_{i - 7} + sigma_0(W_{i - 15}) + W_{i - 16}
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// e.g. W_51 = sigma_1(W_49) + W_44 + sigma_0(W_36) + W_35
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// sigma_0_v2(W_[36..49]) will be used to get the new W_[51..64]
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// sigma_1(W_[49..62]) will also be used to get the W_[51..64]
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// The lowest-index words involved will be W_[35..58]
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let mut new_word = |idx: usize| -> Result<(), Error> {
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// Decompose word into (10, 7, 2, 13)-bit chunks
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let subregion3_word = self.decompose_subregion3_word(region, w[idx].value(), idx)?;
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// sigma_1 on subregion3_word
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let (r_0_even, r_1_even) = self.lower_sigma_1(region, subregion3_word)?;
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let new_word_idx = idx + 2;
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// Copy sigma_0_v2(W_{i - 15}) output from Subregion 2
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lower_sigma_0_v2_output[idx - 49].0.copy_advice(
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|| format!("sigma_0(W_{})_lo", new_word_idx - 15),
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region,
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a_6,
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get_word_row(new_word_idx - 16),
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)?;
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lower_sigma_0_v2_output[idx - 49].1.copy_advice(
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|| format!("sigma_0(W_{})_hi", new_word_idx - 15),
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region,
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a_6,
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get_word_row(new_word_idx - 16) + 1,
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)?;
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// Copy sigma_1(W_{i - 2})
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r_0_even.copy_advice(
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|| format!("sigma_1(W_{})_lo", new_word_idx - 2),
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region,
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a_7,
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get_word_row(new_word_idx - 16),
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)?;
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r_1_even.copy_advice(
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|| format!("sigma_1(W_{})_hi", new_word_idx - 2),
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region,
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a_7,
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get_word_row(new_word_idx - 16) + 1,
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)?;
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// Copy W_{i - 7}
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w_halves[new_word_idx - 7].0.copy_advice(
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|| format!("W_{}_lo", new_word_idx - 7),
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region,
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a_8,
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get_word_row(new_word_idx - 16),
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)?;
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w_halves[new_word_idx - 7].1.copy_advice(
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|| format!("W_{}_hi", new_word_idx - 7),
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region,
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a_8,
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get_word_row(new_word_idx - 16) + 1,
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)?;
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// Calculate W_i, carry_i
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let (word, carry) = sum_with_carry(vec![
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(r_0_even.value_u16(), r_1_even.value_u16()),
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(
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w_halves[new_word_idx - 7].0.value_u16(),
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w_halves[new_word_idx - 7].1.value_u16(),
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),
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(
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lower_sigma_0_v2_output[idx - 49].0.value_u16(),
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lower_sigma_0_v2_output[idx - 49].1.value_u16(),
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),
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(
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w_halves[new_word_idx - 16].0.value_u16(),
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w_halves[new_word_idx - 16].1.value_u16(),
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),
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]);
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// Assign W_i, carry_i
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region.assign_advice(
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|| format!("W_{}", new_word_idx),
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a_5,
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get_word_row(new_word_idx - 16) + 1,
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|| word.map(|word| pallas::Base::from(word as u64)),
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)?;
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region.assign_advice(
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|| format!("carry_{}", new_word_idx),
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a_9,
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get_word_row(new_word_idx - 16) + 1,
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|| carry.map(pallas::Base::from),
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)?;
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let (word, halves) = self.assign_word_and_halves(region, word, new_word_idx)?;
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w.push(MessageWord(word));
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w_halves.push(halves);
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Ok(())
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};
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for i in 49..62 {
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new_word(i)?;
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}
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Ok(())
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}
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/// Pieces of length [10, 7, 2, 13]
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fn decompose_subregion3_word(
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&self,
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region: &mut Region<'_, pallas::Base>,
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word: Value<&Bits<32>>,
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index: usize,
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) -> Result<Subregion3Word, Error> {
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let row = get_word_row(index);
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// Rename these here for ease of matching the gates to the specification.
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let a_3 = self.extras[0];
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let a_4 = self.extras[1];
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let pieces = word.map(|word| {
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vec![
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word[0..10].to_vec(),
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word[10..17].to_vec(),
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word[17..19].to_vec(),
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word[19..32].to_vec(),
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]
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});
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let pieces = pieces.transpose_vec(4);
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// Assign `a` (10-bit piece)
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let spread_a = pieces[0].clone().map(SpreadWord::try_new);
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let spread_a = SpreadVar::with_lookup(region, &self.lookup, row + 1, spread_a)?;
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// Assign `b` (7-bit piece)
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let b = AssignedBits::<7>::assign_bits(region, || "b", a_4, row + 1, pieces[1].clone())?;
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// Assign `c` (2-bit piece)
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let c = AssignedBits::<2>::assign_bits(region, || "c", a_3, row + 1, pieces[2].clone())?;
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// Assign `d` (13-bit piece) lookup
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let spread_d = pieces[3].clone().map(SpreadWord::try_new);
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let spread_d = SpreadVar::with_lookup(region, &self.lookup, row, spread_d)?;
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Ok(Subregion3Word {
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index,
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a: spread_a.dense,
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b,
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c,
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d: spread_d.dense,
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spread_a: spread_a.spread,
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spread_d: spread_d.spread,
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})
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}
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fn lower_sigma_1(
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&self,
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region: &mut Region<'_, pallas::Base>,
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word: Subregion3Word,
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) -> Result<(AssignedBits<16>, AssignedBits<16>), Error> {
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let a_3 = self.extras[0];
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let a_4 = self.extras[1];
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let a_5 = self.message_schedule;
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let a_6 = self.extras[2];
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let row = get_word_row(word.index) + 3;
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// Assign `spread_a` and copy constraint
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word.spread_a.copy_advice(|| "spread_a", region, a_4, row)?;
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// Split `b` (7-bit chunk) into (2, 2, 3)-bit `b_lo`, `b_mid` and `b_hi`.
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// Assign `b_lo`, `spread_b_lo`, `b_mid`, `spread_b_mid`, `b_hi`, `spread_b_hi`.
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// b_lo (2-bit chunk)
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{
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let b_lo: Value<[bool; 2]> = word.b.value().map(|v| v[0..2].try_into().unwrap());
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let b_lo = b_lo.map(SpreadWord::<2, 4>::new);
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SpreadVar::without_lookup(region, a_3, row - 1, a_4, row - 1, b_lo)?;
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}
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// b_mid (2-bit chunk)
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{
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let b_mid: Value<[bool; 2]> = word.b.value().map(|v| v[2..4].try_into().unwrap());
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let b_mid = b_mid.map(SpreadWord::<2, 4>::new);
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SpreadVar::without_lookup(region, a_5, row - 1, a_6, row - 1, b_mid)?;
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}
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// b_hi (3-bit chunk)
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{
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let b_hi: Value<[bool; 3]> = word.b.value().map(|v| v[4..7].try_into().unwrap());
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let b_hi = b_hi.map(SpreadWord::<3, 6>::new);
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SpreadVar::without_lookup(region, a_5, row + 1, a_6, row + 1, b_hi)?;
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}
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// Assign `b` and copy constraint
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word.b.copy_advice(|| "b", region, a_6, row)?;
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// Assign `c` and copy constraint
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word.c.copy_advice(|| "c", region, a_3, row + 1)?;
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// Witness `spread_c`
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{
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let spread_c = word.c.value().map(spread_bits);
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AssignedBits::<4>::assign_bits(region, || "spread_c", a_4, row + 1, spread_c)?;
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}
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// Assign `spread_d` and copy constraint
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word.spread_d.copy_advice(|| "spread_d", region, a_5, row)?;
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// (10, 7, 2, 13)
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// Calculate R_0^{even}, R_0^{odd}, R_1^{even}, R_1^{odd}
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let r = word.xor_lower_sigma_1();
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let r_0: Value<[bool; 32]> = r.map(|r| r[..32].try_into().unwrap());
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let r_0_even = r_0.map(even_bits);
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let r_0_odd = r_0.map(odd_bits);
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let r_1: Value<[bool; 32]> = r.map(|r| r[32..].try_into().unwrap());
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let r_1_even = r_1.map(even_bits);
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let r_1_odd = r_1.map(odd_bits);
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self.assign_sigma_outputs(
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region,
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&self.lookup,
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a_3,
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row,
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r_0_even,
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r_0_odd,
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r_1_even,
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r_1_odd,
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)
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}
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}
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