function_prime.h

// Copyright 2011-2024 Google LLC
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     https://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

#ifndef MATCH_FUNCTION_PRIME_H_
#define MATCH_FUNCTION_PRIME_H_

#include "third_party/zynamics/bindiff/match/call_graph.h"

namespace security::bindiff {

// Matches functions based on their instruction prime products. Each mnemonic
// gets assigned a unique small prime number. These primes are multiplied for
// all instructions of the function. This yields a structurally invariant,
// instruction order independent, product to be subsequently used as a matching
// attribute.
class MatchingStepPrime : public MatchingStep {
 public:
  MatchingStepPrime()
      : MatchingStep("function: prime signature matching",
                     "Function: Prime Signature") {}

  bool FindFixedPoints(const FlowGraph* primary_parent,
                       const FlowGraph* secondary_parent,
                       FlowGraphs& flow_graphs_1, FlowGraphs& flow_graphs_2,
                       MatchingContext& context, MatchingSteps& matching_steps,
                       const MatchingStepsFlowGraph& default_steps) override;

 private:
  void GetUnmatchedFlowGraphsByPrimeSignature(const FlowGraphs& flow_graphs,
                                              FlowGraphIntMap& flow_graphs_map);
};

}  // namespace security::bindiff

#endif  // MATCH_FUNCTION_PRIME_H_