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[chore] Expose Keccak Packing #180

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Oct 10, 2023
Merged

[chore] Expose Keccak Packing #180

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38 changes: 22 additions & 16 deletions hashes/zkevm/src/keccak/component/encode.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,27 @@ use super::param::*;

/// Encode a native input bytes into its corresponding lookup key. This function can be considered as the spec of the encoding.
pub fn encode_native_input<F: Field>(bytes: &[u8]) -> F {
let witnesses_per_keccak_f = pack_native_input(bytes);
// Absorb witnesses keccak_f by keccak_f.
let mut native_poseidon_sponge =
snark_verifier::util::hash::Poseidon::<F, F, POSEIDON_T, POSEIDON_RATE>::new::<
POSEIDON_R_F,
POSEIDON_R_P,
POSEIDON_SECURE_MDS,
>(&NativeLoader);
for witnesses in witnesses_per_keccak_f {
for absorbing in witnesses.chunks(POSEIDON_RATE) {
// To avoid absorbing witnesses crossing keccak_fs together, pad 0s to make sure absorb.len() == RATE.
let mut padded_absorb = [F::ZERO; POSEIDON_RATE];
padded_absorb[..absorbing.len()].copy_from_slice(absorbing);
native_poseidon_sponge.update(&padded_absorb);
}
}
native_poseidon_sponge.squeeze()
}

/// Pack native input bytes into num_word_per_witness field elements which are more poseidon friendly.
pub fn pack_native_input<F: Field>(bytes: &[u8]) -> Vec<Vec<F>> {
assert!(NUM_BITS_PER_WORD <= u128::BITS as usize);
let multipliers: Vec<F> = get_words_to_witness_multipliers::<F>();
let num_word_per_witness = num_word_per_witness::<F>();
Expand Down Expand Up @@ -68,22 +89,7 @@ pub fn encode_native_input<F: Field>(bytes: &[u8]) -> F {
.collect_vec()
})
.collect_vec();
// Absorb witnesses keccak_f by keccak_f.
let mut native_poseidon_sponge =
snark_verifier::util::hash::Poseidon::<F, F, POSEIDON_T, POSEIDON_RATE>::new::<
POSEIDON_R_F,
POSEIDON_R_P,
POSEIDON_SECURE_MDS,
>(&NativeLoader);
for witnesses in witnesses_per_keccak_f {
for absorbing in witnesses.chunks(POSEIDON_RATE) {
// To avoid absorbing witnesses crossing keccak_fs together, pad 0s to make sure absorb.len() == RATE.
let mut padded_absorb = [F::ZERO; POSEIDON_RATE];
padded_absorb[..absorbing.len()].copy_from_slice(absorbing);
native_poseidon_sponge.update(&padded_absorb);
}
}
native_poseidon_sponge.squeeze()
witnesses_per_keccak_f
}

/// Encode a VarLenBytesVec into its corresponding lookup key.
Expand Down