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- #pragma once
- #include "seal/seal.h"
- #include "seal/util/polyarithsmallmod.h"
- #include <cassert>
- #include <cmath>
- #include <string>
- #include <vector>
- typedef std::vector<seal::Plaintext> Database;
- typedef std::vector<std::vector<seal::Ciphertext>> PirQuery;
- typedef std::vector<seal::Ciphertext> PirReply;
- struct PirParams {
- bool enable_symmetric;
- bool enable_batching;
- bool enable_mswitching;
- std::uint64_t ele_num;
- std::uint64_t ele_size;
- std::uint64_t elements_per_plaintext;
- std::uint64_t num_of_plaintexts; // number of plaintexts in database
- std::uint32_t d; // number of dimensions for the database
- std::uint32_t expansion_ratio; // ratio of ciphertext to plaintext
- std::vector<std::uint64_t> nvec; // size of each of the d dimensions
- std::uint32_t slot_count;
- };
- void gen_encryption_params(std::uint32_t N, // degree of polynomial
- std::uint32_t logt, // bits of plaintext coefficient
- seal::EncryptionParameters &enc_params);
- void gen_pir_params(uint64_t ele_num,
- uint64_t ele_size,
- uint32_t d,
- const seal::EncryptionParameters &enc_params,
- PirParams &pir_params,
- bool enable_symmetric = false,
- bool enable_batching = true,
- bool enable_mswitching = true);
- void gen_params(uint64_t ele_num,
- uint64_t ele_size,
- uint32_t N,
- uint32_t logt,
- uint32_t d,
- seal::EncryptionParameters ¶ms,
- PirParams &pir_params);
- void verify_encryption_params(const seal::EncryptionParameters &enc_params);
- void print_pir_params(const PirParams &pir_params);
- void print_seal_params(const seal::EncryptionParameters &enc_params);
- // returns the number of plaintexts that the database can hold
- std::uint64_t plaintexts_per_db(std::uint32_t logt, std::uint64_t N, std::uint64_t ele_num,
- std::uint64_t ele_size);
- // returns the number of elements that a single FV plaintext can hold
- std::uint64_t elements_per_ptxt(std::uint32_t logt, std::uint64_t N, std::uint64_t ele_size);
- // returns the number of coefficients needed to store one element
- std::uint64_t coefficients_per_element(std::uint32_t logt, std::uint64_t ele_size);
- // Converts an array of bytes to a vector of coefficients, each of which is less
- // than the plaintext modulus
- std::vector<std::uint64_t> bytes_to_coeffs(std::uint32_t limit, const std::uint8_t *bytes,
- std::uint64_t size);
- // Converts an array of coefficients into an array of bytes
- void coeffs_to_bytes(std::uint32_t limit, const std::vector<std::uint64_t> &coeffs, std::uint8_t *output,
- std::uint32_t size_out, std::uint32_t ele_size);
- // Takes a vector of coefficients and returns the corresponding FV plaintext
- void vector_to_plaintext(const std::vector<std::uint64_t> &coeffs, seal::Plaintext &plain);
- // Since the database has d dimensions, and an item is a particular cell
- // in the d-dimensional hypercube, this function computes the corresponding
- // index for each of the d dimensions
- std::vector<std::uint64_t> compute_indices(std::uint64_t desiredIndex,
- std::vector<std::uint64_t> nvec);
- uint64_t invert_mod(uint64_t m, const seal::Modulus& mod);
- uint32_t compute_expansion_ratio(seal::EncryptionParameters params);
- std::vector<seal::Plaintext> decompose_to_plaintexts(seal::EncryptionParameters params,
- const seal::Ciphertext& ct);
- //We need the returned ciphertext to be initialized by Context so the caller will pass it in
- void compose_to_ciphertext(seal::EncryptionParameters params,
- const std::vector<seal::Plaintext>& pts, seal::Ciphertext& ct);
- void compose_to_ciphertext(seal::EncryptionParameters params,
- std::vector<seal::Plaintext>::const_iterator pt_iter, seal::Ciphertext& ct);
- // Serialize and deserialize galois keys to send them over the network
- std::string serialize_galoiskeys(seal::Serializable<seal::GaloisKeys> g);
- seal::GaloisKeys *deserialize_galoiskeys(std::string s, std::shared_ptr<seal::SEALContext> context);
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