fiat_shamir.hpp

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//---------------------------------------------------------------------------//
// Copyright (c) 2021 Mikhail Komarov <nemo@nil.foundation>
// Copyright (c) 2021 Nikita Kaskov <nbering@nil.foundation>
//
// MIT License
//
// Permission is hereby granted, free of charge, to any person obtaining a copy
// of this software and associated documentation files (the "Software"), to deal
// in the Software without restriction, including without limitation the rights
// to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
// copies of the Software, and to permit persons to whom the Software is
// furnished to do so, subject to the following conditions:
//
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
// FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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//---------------------------------------------------------------------------//
 
#ifndef CRYPTO3_ZK_TRANSCRIPT_FIAT_SHAMIR_HEURISTIC_HPP
#define CRYPTO3_ZK_TRANSCRIPT_FIAT_SHAMIR_HEURISTIC_HPP
 
namespace nil {
    namespace crypto3 {
        namespace zk {
            namespace snark {
 
                template<enum TChallenges, typename Hash = hashes::sha2>
                class fiat_shamir_heuristic {
 
                    accumulators::accumulator_set<Hash> acc;
                public:
                    
                    fiat_shamir_heuristic() {
                        acc();
                    }
 
                    template <typename TAny>
                    operator (TAny data){
                        acc(data);
                    }
 
                    template <challenges_ids ChallengeId>
                    typename Hash::digest_type get_challenge(){
                        acc(ChallengeId);
                        return extract::hash<hash_t>(acc);
                    }
 
                    template <challenges_ids ChallengeId, std::size_t Index>
                    typename Hash::digest_type get_challenge(){
                        acc(ChallengeId + Index);
                        return extract::hash<hash_t>(acc);
                    }
                };
            }    // namespace snark
        }        // namespace zk
    }            // namespace crypto3
}    // namespace nil
 
#endif    // CRYPTO3_ZK_TRANSCRIPT_FIAT_SHAMIR_HEURISTIC_HPP