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| 1 | +use core::borrow::Borrow; |
| 2 | + |
| 3 | +use p3_air::{Air, AirBuilder, BaseAir}; |
| 4 | +use p3_field::PrimeCharacteristicRing; |
| 5 | +use p3_matrix::Matrix; |
| 6 | +use p3_poseidon2::GenericPoseidon2LinearLayers; |
| 7 | +use p3_poseidon2_air::{Poseidon2Air, RoundConstants}; |
| 8 | + |
| 9 | +use crate::{Poseidon2CompressCols, num_cols}; |
| 10 | + |
| 11 | +/// Extends the Poseidon2 AIR with recursion circuit-specific columns and constraints. |
| 12 | +/// Assumes the field size is at least 16 bits. |
| 13 | +/// |
| 14 | +/// It compresses `N` chunks of size 'CHUNK' of degree-`D` extension field elements into one chunk. |
| 15 | +#[derive(Debug)] |
| 16 | +pub struct Poseidon2CompressAir< |
| 17 | + F: PrimeCharacteristicRing, |
| 18 | + LinearLayers, |
| 19 | + const D: usize, |
| 20 | + const N: usize, |
| 21 | + const WIDTH: usize, |
| 22 | + const CHUNK: usize, |
| 23 | + const INPUT_EXTF: usize, |
| 24 | + const SBOX_DEGREE: u64, |
| 25 | + const SBOX_REGISTERS: usize, |
| 26 | + const HALF_FULL_ROUNDS: usize, |
| 27 | + const PARTIAL_ROUNDS: usize, |
| 28 | +> { |
| 29 | + p3_poseidon2: Poseidon2Air< |
| 30 | + F, |
| 31 | + LinearLayers, |
| 32 | + WIDTH, |
| 33 | + SBOX_DEGREE, |
| 34 | + SBOX_REGISTERS, |
| 35 | + HALF_FULL_ROUNDS, |
| 36 | + PARTIAL_ROUNDS, |
| 37 | + >, |
| 38 | +} |
| 39 | + |
| 40 | +impl< |
| 41 | + F: PrimeCharacteristicRing, |
| 42 | + LinearLayers, |
| 43 | + const D: usize, |
| 44 | + const N: usize, |
| 45 | + const WIDTH: usize, |
| 46 | + const CHUNK: usize, |
| 47 | + const INPUT_EXTF: usize, |
| 48 | + const SBOX_DEGREE: u64, |
| 49 | + const SBOX_REGISTERS: usize, |
| 50 | + const HALF_FULL_ROUNDS: usize, |
| 51 | + const PARTIAL_ROUNDS: usize, |
| 52 | +> |
| 53 | + Poseidon2CompressAir< |
| 54 | + F, |
| 55 | + LinearLayers, |
| 56 | + D, |
| 57 | + N, |
| 58 | + WIDTH, |
| 59 | + CHUNK, |
| 60 | + INPUT_EXTF, |
| 61 | + SBOX_DEGREE, |
| 62 | + SBOX_REGISTERS, |
| 63 | + HALF_FULL_ROUNDS, |
| 64 | + PARTIAL_ROUNDS, |
| 65 | + > |
| 66 | +{ |
| 67 | + pub const fn new( |
| 68 | + constants: RoundConstants<F, WIDTH, HALF_FULL_ROUNDS, PARTIAL_ROUNDS>, |
| 69 | + ) -> Self { |
| 70 | + assert!(CHUNK * N == INPUT_EXTF); |
| 71 | + assert!(D * INPUT_EXTF == WIDTH); |
| 72 | + |
| 73 | + Self { |
| 74 | + p3_poseidon2: Poseidon2Air::new(constants), |
| 75 | + } |
| 76 | + } |
| 77 | +} |
| 78 | + |
| 79 | +impl< |
| 80 | + F: PrimeCharacteristicRing + Sync, |
| 81 | + LinearLayers: Sync, |
| 82 | + const D: usize, |
| 83 | + const N: usize, |
| 84 | + const WIDTH: usize, |
| 85 | + const CHUNK: usize, |
| 86 | + const INPUT_EXTF: usize, |
| 87 | + const SBOX_DEGREE: u64, |
| 88 | + const SBOX_REGISTERS: usize, |
| 89 | + const HALF_FULL_ROUNDS: usize, |
| 90 | + const PARTIAL_ROUNDS: usize, |
| 91 | +> BaseAir<F> |
| 92 | + for Poseidon2CompressAir< |
| 93 | + F, |
| 94 | + LinearLayers, |
| 95 | + D, |
| 96 | + N, |
| 97 | + WIDTH, |
| 98 | + CHUNK, |
| 99 | + INPUT_EXTF, |
| 100 | + SBOX_DEGREE, |
| 101 | + SBOX_REGISTERS, |
| 102 | + HALF_FULL_ROUNDS, |
| 103 | + PARTIAL_ROUNDS, |
| 104 | + > |
| 105 | +{ |
| 106 | + fn width(&self) -> usize { |
| 107 | + num_cols::< |
| 108 | + WIDTH, |
| 109 | + CHUNK, |
| 110 | + INPUT_EXTF, |
| 111 | + SBOX_DEGREE, |
| 112 | + SBOX_REGISTERS, |
| 113 | + HALF_FULL_ROUNDS, |
| 114 | + PARTIAL_ROUNDS, |
| 115 | + >() |
| 116 | + } |
| 117 | +} |
| 118 | + |
| 119 | +pub(crate) fn eval< |
| 120 | + AB: AirBuilder, |
| 121 | + LinearLayers: GenericPoseidon2LinearLayers<WIDTH>, |
| 122 | + const D: usize, |
| 123 | + const N: usize, |
| 124 | + const WIDTH: usize, |
| 125 | + const CHUNK: usize, |
| 126 | + const INPUT_EXTF: usize, |
| 127 | + const SBOX_DEGREE: u64, |
| 128 | + const SBOX_REGISTERS: usize, |
| 129 | + const HALF_FULL_ROUNDS: usize, |
| 130 | + const PARTIAL_ROUNDS: usize, |
| 131 | +>( |
| 132 | + air: &Poseidon2CompressAir< |
| 133 | + AB::F, |
| 134 | + LinearLayers, |
| 135 | + D, |
| 136 | + N, |
| 137 | + WIDTH, |
| 138 | + CHUNK, |
| 139 | + INPUT_EXTF, |
| 140 | + SBOX_DEGREE, |
| 141 | + SBOX_REGISTERS, |
| 142 | + HALF_FULL_ROUNDS, |
| 143 | + PARTIAL_ROUNDS, |
| 144 | + >, |
| 145 | + builder: &mut AB, |
| 146 | + _local: &Poseidon2CompressCols< |
| 147 | + AB::Var, |
| 148 | + WIDTH, |
| 149 | + CHUNK, |
| 150 | + INPUT_EXTF, |
| 151 | + SBOX_DEGREE, |
| 152 | + SBOX_REGISTERS, |
| 153 | + HALF_FULL_ROUNDS, |
| 154 | + PARTIAL_ROUNDS, |
| 155 | + >, |
| 156 | +) { |
| 157 | + air.p3_poseidon2.eval(builder); |
| 158 | + |
| 159 | + // TODO: Add all lookups: |
| 160 | + // - Receive input columns from witness table. |
| 161 | + // - Send output columns to witness table. |
| 162 | +} |
| 163 | + |
| 164 | +impl< |
| 165 | + AB: AirBuilder, |
| 166 | + LinearLayers: GenericPoseidon2LinearLayers<WIDTH>, |
| 167 | + const D: usize, |
| 168 | + const N: usize, |
| 169 | + const WIDTH: usize, |
| 170 | + const CHUNK: usize, |
| 171 | + const INPUT_EXTF: usize, |
| 172 | + const SBOX_DEGREE: u64, |
| 173 | + const SBOX_REGISTERS: usize, |
| 174 | + const HALF_FULL_ROUNDS: usize, |
| 175 | + const PARTIAL_ROUNDS: usize, |
| 176 | +> Air<AB> |
| 177 | + for Poseidon2CompressAir< |
| 178 | + AB::F, |
| 179 | + LinearLayers, |
| 180 | + D, |
| 181 | + N, |
| 182 | + WIDTH, |
| 183 | + CHUNK, |
| 184 | + INPUT_EXTF, |
| 185 | + SBOX_DEGREE, |
| 186 | + SBOX_REGISTERS, |
| 187 | + HALF_FULL_ROUNDS, |
| 188 | + PARTIAL_ROUNDS, |
| 189 | + > |
| 190 | +{ |
| 191 | + #[inline] |
| 192 | + fn eval(&self, builder: &mut AB) { |
| 193 | + let main = builder.main(); |
| 194 | + let local = main.row_slice(0).expect("The matrix is empty?"); |
| 195 | + let local = (*local).borrow(); |
| 196 | + |
| 197 | + eval::< |
| 198 | + _, |
| 199 | + _, |
| 200 | + D, |
| 201 | + N, |
| 202 | + WIDTH, |
| 203 | + CHUNK, |
| 204 | + INPUT_EXTF, |
| 205 | + SBOX_DEGREE, |
| 206 | + SBOX_REGISTERS, |
| 207 | + HALF_FULL_ROUNDS, |
| 208 | + PARTIAL_ROUNDS, |
| 209 | + >(self, builder, local); |
| 210 | + } |
| 211 | +} |
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