ecdsa_constraints.hpp

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// === AUDIT STATUS ===
// internal:    { status: completed, auditors: [Federico], date: 2025-10-24 }
// external_1:  { status: not started, auditors: [], date: YYYY-MM-DD }
// external_2:  { status: not started, auditors: [], date: YYYY-MM-DD }
// =====================
 
#pragma once
#include "barretenberg/crypto/ecdsa/ecdsa.hpp"
#include "barretenberg/dsl/acir_format/witness_constant.hpp"
#include "barretenberg/serialize/msgpack.hpp"
#include "barretenberg/stdlib/primitives/byte_array/byte_array.hpp"
#include <vector>
 
namespace acir_format {
 
using namespace bb;
 
struct EcdsaConstraint {
    bb::CurveType type;
 
    // The byte representation of the hashed message.
    std::array<uint32_t, 32> hashed_message;
 
    // The signature
    std::array<uint32_t, 64> signature;
 
    // The public key against which the signature must be verified.
    // Since Fr does not have enough bits to represent the prime field in
    // secp256k1 or secp256r1, a byte array is used.
    std::array<uint32_t, 32> pub_x_indices;
    std::array<uint32_t, 32> pub_y_indices;
 
    // Predicate indicating whether the constraint should be disabled:
    // - true: the constraint is valid
    // - false: the constraint is disabled, i.e it must not fail and can return whatever.
    WitnessOrConstant<bb::fr> predicate;
 
    // Expected result of signature verification
    uint32_t result;
 
    // For serialization, update with any new fields
    MSGPACK_FIELDS(hashed_message, signature, pub_x_indices, pub_y_indices, predicate, result);
    friend bool operator==(EcdsaConstraint const& lhs, EcdsaConstraint const& rhs) = default;
};
 
template <typename Curve>
void create_ecdsa_verify_constraints(typename Curve::Builder& builder, const EcdsaConstraint& input);
 
template <typename Curve>
void create_dummy_ecdsa_constraint(typename Curve::Builder& builder,
                                   const std::vector<stdlib::field_t<typename Curve::Builder>>& hashed_message_fields,
                                   const std::vector<stdlib::field_t<typename Curve::Builder>>& r_fields,
                                   const std::vector<stdlib::field_t<typename Curve::Builder>>& s_fields,
                                   const std::vector<stdlib::field_t<typename Curve::Builder>>& pub_x_fields,
                                   const std::vector<stdlib::field_t<typename Curve::Builder>>& pub_y_fields,
                                   const stdlib::field_t<typename Curve::Builder>& result_field);
 
} // namespace acir_format