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plonk: added dummy transcript hasher specialized for all curves; adde…
…d unit tests for the simple quadratic residue circuit for all curves (addresses issue #103)
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Vesselin Velichkov
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Jan 25, 2023
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libsnark/zk_proof_systems/plonk/tests/dummy_transcript_hasher.hpp
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| /** @file | ||
| ***************************************************************************** | ||
| * @author This file is part of libff, developed by Clearmatics Ltd | ||
| * (originally developed by SCIPR Lab) and contributors | ||
| * (see AUTHORS). | ||
| * @copyright MIT license (see LICENSE file) | ||
| *****************************************************************************/ | ||
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| #ifndef LIBSNARK_ZK_PROOF_SYSTEMS_PLONK_TESTS_DUMMY_TRANSCRIPT_HASHER_HPP_ | ||
| #define LIBSNARK_ZK_PROOF_SYSTEMS_PLONK_TESTS_DUMMY_TRANSCRIPT_HASHER_HPP_ | ||
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| #include "libsnark/zk_proof_systems/plonk/utils.hpp" | ||
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| #include <array> | ||
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| namespace libsnark | ||
| { | ||
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| /// Implementation of a dummy transcript hasher interface (see | ||
| /// transcript_hasher.hpp). It returns the number of the elemnts in | ||
| /// the hash buffer as an Fr element. Specialized over the curve | ||
| /// field. See also class bls12_381_test_vector_transcript_hasher, | ||
| /// which is specific to the BLS12_381 curve. | ||
| template<typename ppT> class dummy_transcript_hasher | ||
| { | ||
| private: | ||
| // buffer accumulating data to be hashed | ||
| std::vector<uint8_t> buffer; | ||
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| public: | ||
| dummy_transcript_hasher(); | ||
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| // Add an Fr element to the transcript buffer for hashing. | ||
| void add_element(const libff::Fr<ppT> &element); | ||
| // Add the coordinates of a G1 curve point to the transcript buffer for | ||
| // hashing. | ||
| void add_element(const libff::G1<ppT> &element); | ||
| // Add the coordinates of a G2 curve point to the transcript buffer for | ||
| // hashing. | ||
| void add_element(const libff::G2<ppT> &element); | ||
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| // Dummy implementation of get_hash that simply returns the number | ||
| // of elements in the buffer as an Fr value for the purposes of | ||
| // unit testing. TODO: to be replaced by a call to a proper hash | ||
| // function e.g. SHA2, BLAKE, etc. | ||
| libff::Fr<ppT> get_hash(); | ||
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| // clear the buffer (for now only for testing) | ||
| void buffer_clear(); | ||
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| // get buffer size | ||
| size_t buffer_size(); | ||
| }; | ||
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| } // namespace libsnark | ||
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| #include "libsnark/zk_proof_systems/plonk/tests/dummy_transcript_hasher.tcc" | ||
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| #endif // LIBSNARK_ZK_PROOF_SYSTEMS_PLONK_DUMMY_TRANSCRIPT_HASHER_HPP_ |
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libsnark/zk_proof_systems/plonk/tests/dummy_transcript_hasher.tcc
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| /** @file | ||
| ***************************************************************************** | ||
| * @author This file is part of libff, developed by Clearmatics Ltd | ||
| * (originally developed by SCIPR Lab) and contributors | ||
| * (see AUTHORS). | ||
| * @copyright MIT license (see LICENSE file) | ||
| *****************************************************************************/ | ||
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| #ifndef LIBSNARK_ZK_PROOF_SYSTEMS_PLONK_TESTS_DUMMY_TRANSCRIPT_HASHER_CPP_ | ||
| #define LIBSNARK_ZK_PROOF_SYSTEMS_PLONK_TESTS_DUMMY_TRANSCRIPT_HASHER_CPP_ | ||
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| #include "libsnark/zk_proof_systems/plonk/tests/dummy_transcript_hasher.hpp" | ||
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| // Implementation of the dummy transcript hasher interface. See | ||
| // dummy_transcript_hasher.hpp. | ||
| namespace libsnark | ||
| { | ||
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| template<typename ppT> dummy_transcript_hasher<ppT>::dummy_transcript_hasher() | ||
| { | ||
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| } | ||
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| template<typename ppT> void dummy_transcript_hasher<ppT>::buffer_clear() | ||
| { | ||
| this->buffer.clear(); | ||
| } | ||
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| template<typename ppT> size_t dummy_transcript_hasher<ppT>::buffer_size() | ||
| { | ||
| return this->buffer.size(); | ||
| } | ||
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| template<typename ppT> | ||
| void dummy_transcript_hasher<ppT>::add_element(const libff::Fr<ppT> &element) | ||
| { | ||
| // convert the Fr element into a string | ||
| std::string str; | ||
| { | ||
| std::ostringstream ss; | ||
| libff::field_write<libff::encoding_binary, libff::form_plain>( | ||
| element, ss); | ||
| str = ss.str(); | ||
| } | ||
| // copy the string as a sequence of uint8_t elements at the end of | ||
| // the buffer | ||
| std::copy(str.begin(), str.end(), std::back_inserter(this->buffer)); | ||
| } | ||
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| template<typename ppT> | ||
| void dummy_transcript_hasher<ppT>::add_element(const libff::G1<ppT> &element) | ||
| { | ||
| libff::G1<ppT> element_aff(element); | ||
| element_aff.to_affine_coordinates(); | ||
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| // convert the affine coordinates of the curve point into a string | ||
| std::string str; | ||
| { | ||
| std::ostringstream ss; | ||
| libff::group_write< | ||
| libff::encoding_binary, | ||
| libff::form_plain, | ||
| libff::compression_off>(element_aff, ss); | ||
| str = ss.str(); | ||
| } | ||
| // copy the string as a sequence of uint8_t elements at the end of | ||
| // the buffer | ||
| std::copy(str.begin(), str.end(), std::back_inserter(this->buffer)); | ||
| } | ||
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| template<typename ppT> | ||
| void dummy_transcript_hasher<ppT>::add_element(const libff::G2<ppT> &element) | ||
| { | ||
| libff::G2<ppT> element_aff(element); | ||
| element_aff.to_affine_coordinates(); | ||
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| // convert the affine coordinates of the curve point into a string | ||
| std::string str; | ||
| { | ||
| std::ostringstream ss; | ||
| libff::group_write< | ||
| libff::encoding_binary, | ||
| libff::form_plain, | ||
| libff::compression_off>(element_aff, ss); | ||
| str = ss.str(); | ||
| } | ||
| // copy the string as a sequence of uint8_t elements at the end of | ||
| // the buffer | ||
| std::copy(str.begin(), str.end(), std::back_inserter(this->buffer)); | ||
| } | ||
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| template<typename ppT> libff::Fr<ppT> dummy_transcript_hasher<ppT>::get_hash() | ||
| { | ||
| libff::Fr<ppT> buffer_len = libff::Fr<ppT>(this->buffer.size()); | ||
| return buffer_len; | ||
| } | ||
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| } // namespace libsnark | ||
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| #endif // LIBSNARK_ZK_PROOF_SYSTEMS_PLONK_TESTS_DUMMY_TRANSCRIPT_HASHER_CPP_ |
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