Class RingGSWEvalKeyImpl

• Defined in File rgsw-evalkey.h

Inheritance Relationships

Base Type

• public lbcrypto::Serializable (Class Serializable)

Class Documentation

class lbcrypto::RingGSWEvalKeyImpl : public lbcrypto::Serializable

Inheritence diagram for lbcrypto::RingGSWEvalKeyImpl:

Collaboration diagram for lbcrypto::RingGSWEvalKeyImpl:

Class that stores a RingGSW ciphertext; a two-dimensional vector of ring elements.

Public Functions

RingGSWEvalKeyImpl() = default

inline RingGSWEvalKeyImpl(uint32_t rowSize, uint32_t colSize) noexcept

Allocates a rowSize x colSize matrix of default-constructed ring elements

Every row of a RingGSW ciphertext is an RLWE pair (a, b) stored as columns 0 and 1, so colSize is 2. An RGSW encryption of a monomial has 2 * (digitsG - 1) rows: row 2t adds the gadget power baseG^(t + 1) times the monomial to “a” and row 2t + 1 adds it to “b” (the first gadget digit is dropped by the approximate gadget decomposition). An LMKCDEY automorphism key has digitsG - 1 rows.

Parameters

• rowSize – the number of rows (RLWE pairs)

• colSize – the number of ring elements per row

inline explicit RingGSWEvalKeyImpl(const std::vector<std::vector<NativePoly>> &elements)

Constructs a RingGSW ciphertext from its matrix of ring elements

Parameters

elements – the ring elements indexed [row][column]; each row is an RLWE pair (a, b) in columns 0 and 1

inline explicit RingGSWEvalKeyImpl(std::vector<std::vector<NativePoly>> &&elements) noexcept

Constructs a RingGSW ciphertext from its matrix of ring elements, moving it

Parameters

elements – the ring elements indexed [row][column]; each row is an RLWE pair (a, b) in columns 0 and 1

inline RingGSWEvalKeyImpl(const RingGSWEvalKeyImpl &rhs)

inline RingGSWEvalKeyImpl(RingGSWEvalKeyImpl &&rhs) noexcept

inline RingGSWEvalKeyImpl &operator=(const RingGSWEvalKeyImpl &rhs)

inline RingGSWEvalKeyImpl &operator=(RingGSWEvalKeyImpl &&rhs) noexcept

inline const std::vector<std::vector<NativePoly>> &GetElements() const

inline void SetElements(const std::vector<std::vector<NativePoly>> &elements)

inline void SetElements(std::vector<std::vector<NativePoly>> &&elements) noexcept

inline void SetFormat(const Format format)

Switches between COEFFICIENT and Format::EVALUATION polynomial representations using NTT

Parameters

format – the representation to switch all ring elements to

inline std::vector<NativePoly> &operator[](uint32_t i)

Parameters

i – the row index

Returns

the row i (an RLWE pair)

inline const std::vector<NativePoly> &operator[](uint32_t i) const

Parameters

i – the row index

Returns

the row i (an RLWE pair)

inline bool operator==(const RingGSWEvalKeyImpl &other) const

Compares the two matrices element by element

Parameters

other – the RingGSW ciphertext to compare with

Returns

true if both have the same dimensions and equal ring elements

inline bool operator!=(const RingGSWEvalKeyImpl &other) const

Parameters

other – the RingGSW ciphertext to compare with

Returns

true if the dimensions or any ring element differ

template<class Archive>
inline void save(Archive &ar, std::uint32_t const version) const

template<class Archive>
inline void load(Archive &ar, std::uint32_t const version)

inline virtual std::string SerializedObjectName() const override

Returns the name identifying the derived class in serialized form; every serializable class provides it.

Returns

the serialized object name

Public Static Functions

static inline uint32_t SerializedVersion()