keccak_constraint.cpp

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// === AUDIT STATUS ===
// internal:    { status: not started, auditors: [], date: YYYY-MM-DD }
// external_1:  { status: not started, auditors: [], date: YYYY-MM-DD }
// external_2:  { status: not started, auditors: [], date: YYYY-MM-DD }
// =====================
 
#include "keccak_constraint.hpp"
#include "barretenberg/stdlib/hash/keccak/keccak.hpp"
#include "barretenberg/stdlib/primitives/circuit_builders/circuit_builders_fwd.hpp"
#include "round.hpp"
 
namespace acir_format {
 
template <typename Builder> void create_keccak_permutations_constraints(Builder& builder, const Keccakf1600& constraint)
{
    using field_ct = bb::stdlib::field_t<Builder>;
 
    // Create the array containing the permuted state
    std::array<field_ct, bb::stdlib::keccak<Builder>::NUM_KECCAK_LANES> state;
 
    // Get the witness assignment for each witness index
    // Write the witness assignment to the byte array
    for (size_t i = 0; i < constraint.state.size(); ++i) {
        state[i] = to_field_ct(constraint.state[i], builder);
    }
 
    std::array<field_ct, 25> output_state = bb::stdlib::keccak<Builder>::permutation_opcode(state, &builder);
 
    for (size_t i = 0; i < output_state.size(); ++i) {
        output_state[i].assert_equal(field_ct::from_witness_index(&builder, constraint.result[i]));
    }
}
 
template void create_keccak_permutations_constraints<bb::UltraCircuitBuilder>(bb::UltraCircuitBuilder& builder,
                                                                              const Keccakf1600& constraint);
 
template void create_keccak_permutations_constraints<bb::MegaCircuitBuilder>(bb::MegaCircuitBuilder& builder,
                                                                             const Keccakf1600& constraint);
 
} // namespace acir_format