PrivPointUtil Class Reference

#include <PrivPointUtil.h>

Public Member Functions
std::vector< long >	encodePoint (int, int, int)
helib::Ctxt	secureLT (Encryptor &, int, int, helib::Ctxt, helib::Ptxt< helib::BGV >)
helib::Ctxt	secureGT (Encryptor &, int, int, helib::Ctxt, helib::Ptxt< helib::BGV >)
helib::Ctxt	secureLT (Encryptor &, int, int, helib::Ctxt, helib::Ctxt)
helib::Ctxt	secureGT (Encryptor &, int, int, helib::Ctxt, helib::Ctxt)
helib::Ctxt	binaryAdd (Encryptor &, int, int, helib::Ctxt, helib::Ptxt< helib::BGV >)
helib::Ctxt	binaryMult (Encryptor &, int, int, helib::Ctxt, helib::Ptxt< helib::BGV >, int)
int	processResult (Encryptor &, helib::Ctxt, int, int)

Detailed Description

Authored by Adam Caulfield (ac7717). November 3 2021.

Member Function Documentation

binaryAdd()

helib::Ctxt PrivPointUtil::binaryAdd	(	Encryptor &	encryptor,
		int	maxBits,
		int	nSlots,
		helib::Ctxt	a,
		helib::Ptxt< helib::BGV >	b
	)

Conducts binary addition (full adder) between binary integers in a ciphertext and plaintext

Parameters

Encryptor	&encryptor - encryptor object
int	maxBits - bit-length
int	nSlots - ciphertext slots
helib::Ctxt	- binary value A, encrypted as a ciphertext
helib::Ctxt	- binary value B, encoded as a plaintext vector, specifying the BGV scheme

Returns

helib::Ctxt - returns the binary value of A + B

binaryMult()

helib::Ctxt PrivPointUtil::binaryMult	(	Encryptor &	encryptor,
		int	maxBits,
		int	nSlots,
		helib::Ctxt	a,
		helib::Ptxt< helib::BGV >	b,
		int	y
	)

Conducts binary multiplier between binary integers in a ciphertext and plaintext

Parameters

Encryptor	&encryptor - encryptor object
int	maxBits - bit-length
int	nSlots - ciphertext slots
helib::Ctxt	- binary value A, encrypted as a ciphertext
helib::Ctxt	- binary value B, encoded as a plaintext vector, specifying the BGV scheme
int	y - multiplying the y (1) or x (0) value of the point.

Returns

helib::Ctxt - returns the binary value of A * B

encodePoint()

std::vector< long > PrivPointUtil::encodePoint	(	int	maxBits,
		int	p,
		int	nSlots
	)

Given the integer, the max number of bits, and the number of ciphertext slots, encodes the integer into a vector of binary. It is encoded such that the ith index has the ith bit.

Parameters

int	value: the integer
int	maxBits: bit-length
int	nSlots: ciphertext slots

Returns

std::vector<long>

processResult()

int PrivPointUtil::processResult	(	Encryptor &	encryptor,
		helib::Ctxt	resultCtxt,
		int	nSlots,
		int	total
	)

Takes a ciphertext expected to contain the result. Decrypts it and converts the binary number into a decimal integer.

Parameters

Encryptor	&encryptor - encryptor object
helib::Ctxt	- result ciphertext
int	nSlots - ciphertext slots
int	total - total bits to print

Returns

int - returns the decimal integer of the result

secureGT() [1/2]

helib::Ctxt PrivPointUtil::secureGT	(	Encryptor &	encryptor,
		int	maxBits,
		int	nSlots,
		helib::Ctxt	a,
		helib::Ptxt< helib::BGV >	b
	)

Conducts greater than operation between a ciphertext and a plaintext vector (for X-Node). Implements the secure comparison by Aloufi et. al.

Parameters

Encryptor	&encryptor - encryptor object
int	maxBits - bit-length
int	nSlots - ciphertext slots
helib::Ctxt	- binary value A, encrypted as a ciphertext
helib::Ptxt<helib::BGV>	- binary value B, encoded as a plaintext vector, specifying the BGV scheme

Returns

helib::Ctxt - ciphertext representing A > B

secureGT() [2/2]

helib::Ctxt PrivPointUtil::secureGT	(	Encryptor &	encryptor,
		int	maxBits,
		int	nSlots,
		helib::Ctxt	a,
		helib::Ctxt	b
	)

Conducts secure greater than operation between two ciphertexts (for Y-Node). Implements the secure comparison by Aloufi et. al.

Parameters

Encryptor	&encryptor - encryptor object
int	maxBits - bit-length
int	nSlots - ciphertext slots
helib::Ctxt	- binary value A, encrypted as a ciphertext
helib::Ctxt	- binary value B, encrypted as a ciphertext

Returns

helib::Ctxt - ciphertext representing A > B

secureLT() [1/2]

helib::Ctxt PrivPointUtil::secureLT	(	Encryptor &	encryptor,
		int	maxBits,
		int	nSlots,
		helib::Ctxt	a,
		helib::Ptxt< helib::BGV >	b
	)

Conducts secure less than or equal to operation between a ciphertext and a plaintext vector (for X-Node). Implements the secure comparison by Aloufi et. al.

Parameters

Encryptor	&encryptor - encryptor object
int	maxBits - bit-length
int	nSlots - ciphertext slots
helib::Ctxt	- binary value A, encrypted as a ciphertext
helib::Ptxt<helib::BGV>	- binary value B, encoded as a plaintext vector, specifying the BGV scheme

Returns

helib::Ctxt - ciphertext representing A <= B

secureLT() [2/2]

helib::Ctxt PrivPointUtil::secureLT	(	Encryptor &	encryptor,
		int	maxBits,
		int	nSlots,
		helib::Ctxt	a,
		helib::Ctxt	b
	)

Conducts secure less than or equal to operation between two ciphertexts (for Y-Node). Implements the secure comparison by Aloufi et. al.

Parameters

Encryptor	&encryptor - encryptor object
int	maxBits - bit-length
int	nSlots - ciphertext slots
helib::Ctxt	- binary value A, encrypted as a ciphertext
helib::Ctxt	- binary value B, encrypted as a ciphertext

Returns

helib::Ctxt - ciphertext representing A <= B

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The documentation for this class was generated from the following files:

• include/PrivPointUtil.h
• src/PrivPointUtil.cpp