Template Class ILDCRTParams

Defined in File ildcrtparams.h

Page Contents

Inheritance Relationships
- Base Type
Template Parameter Order
Class Documentation

Inheritance Relationships

Base Type

public lbcrypto::ElemParams< IntType > (Template Class ElemParams)

Template Parameter Order

typename IntType

Class Documentation

template<typename IntType> class lbcrypto::ILDCRTParams : public lbcrypto::ElemParams<IntType>

Inheritence diagram for lbcrypto::ILDCRTParams:

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Collaboration diagram for lbcrypto::ILDCRTParams:

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Parameters for array of ideal lattices (used for Double-CRT).

The double-CRT representation of polynomials is a common optimization for lattice encryption operations. Basically, it allows large-modulus polynamials to be represented as multiple smaller-modulus polynomials. The double-CRT representations are discussed theoretically here:

Gentry C., Halevi S., Smart N.P. (2012) Homomorphic Evaluation of the AES Circuit. In: Safavi-Naini R., Canetti R. (eds) Advances in Cryptology - CRYPTO 2012. Lecture Notes in Computer Science, vol 7417. Springer, Berlin, Heidelberg

Public Types

using Integer = IntType 

using ILNativeParams = ILParamsImpl<NativeInteger>

Public Functions

inline ILDCRTParams(uint32_t corder, const IntType &modulus, const IntType &rootOfUnity = IntType(0))

inline explicit ILDCRTParams(uint32_t corder = 0, uint32_t depth = 1, uint32_t bits = MAX_MODULUS_SIZE)

Constructor with basic parameter set. q is selected as LastPrime(bits, order)

Parameters

corder – the order of the ciphertext.
depth – is the size of the tower.
bits – is the number of bits of each tower’s moduli.

inline ILDCRTParams(uint32_t corder, const std::vector<NativeInteger> &moduli, const std::vector<NativeInteger> &rootsOfUnity)

Constructor with some pre-computed parameters provided as input.

Parameters

corder – the order of the ciphertext
moduli – the list of the smaller moduli of the component polynomials.
rootsOfUnity – the list of the smaller roots of unity of the component polynomials.
moduliBig – the list of the big moduli of the component polynomials (arbitrary cyclotomics).
rootsOfUnityBig – the list of the roots of unity of the component polynomials for big moduli (arbitrary cyclotomics).

Returns

inline ILDCRTParams(uint32_t corder, const std::vector<NativeInteger> &moduli, const std::vector<NativeInteger> &rootsOfUnity, const std::vector<NativeInteger> &moduliBig, const std::vector<NativeInteger> &rootsOfUnityBig, const IntType &inputOriginalModulus = IntType(0))

inline ILDCRTParams(uint32_t corder, const std::vector<NativeInteger> &moduli, const IntType &inputOriginalModulus = IntType(0))

Constructor with only cylotomic order and chain of moduli. Multiplied values of the chain of moduli is automatically calculated. Root of unity of the modulus is also calculated.

Parameters

corder – the order of the ciphertext
&moduli – is the tower of moduli

inline ILDCRTParams(uint32_t corder, const std::vector<std::shared_ptr<ILNativeParams>> &params, const IntType &inputOriginalModulus = IntType(0))

Constructor that takes in the cyclotomic order and the component parameters of the component moduli.

Parameters

corder – the primary cyclotomic order. This is not checked against the component moduli.
params – the componet parameters.

Returns

inline ILDCRTParams(const ILDCRTParams &rhs)

inline ILDCRTParams(ILDCRTParams &&rhs) noexcept

inline ILDCRTParams &operator=(const ILDCRTParams &rhs)

Assignment Operator.

Parameters: &rhs – the copied ILDCRTParams.
Returns: the resulting ILDCRTParams.

inline ILDCRTParams &operator=(ILDCRTParams &&rhs) noexcept

inline const std::vector<std::shared_ptr<ILNativeParams>> &GetParams() const

Getter method for the component parameters.

Returns: A vector of the component polynomial parameters.

inline std::vector<std::shared_ptr<ILNativeParams>> GetParamPartition(uint32_t start, uint32_t end) const

Getter method that returns a subset of the component parameters.

Parameters

start – The index of the first tower to include in the result.
end – The index of the last tower to include.

Returns

A vector of the component polynomial parameters.

inline const IntType &GetOriginalModulus() const

Simple getter method for the original modulus, not the ciphertex modulus.

Returns: The original modulus, not the big ciphertext modulus.

inline void SetOriginalModulus(const IntType &inputOriginalModulus)

Simple setter method for the original modulus, not the ciphertex modulus.

Returns: void

inline std::shared_ptr<ILNativeParams> &operator[](size_t i)

Getter method for the component parameters of a specific index.

Parameters: i – the index of the parameters to return. Note this this call is unguarded if the index is out of bounds.
Returns: the parameters at index i.

inline const std::shared_ptr<ILNativeParams> &operator[](size_t i) const

inline void PopLastParam(): Removes the last parameter set and adjust the multiplied moduli.

inline void PopFirstParam(): Removes the first parameter set and adjust the multiplied moduli.

~ILDCRTParams() override = default: Destructor.

inline virtual bool operator==(const ElemParams<IntType> &other) const override

Equality operator checks if the ElemParams are the same.

Parameters: &other – ElemParams to compare against.
Returns: the equality check results.

inline void RecalculateModulus(): Method to recalculate the composite modulus from the component moduli.

inline void RecalculateBigModulus(): Method to recalculate the big composite modulus from the component moduli.

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

Public Static Functions

static inline uint32_t SerializedVersion()