Controller for the Paillier cryptosystem applied to PGM images. More...

#include <PaillierControllerPGM.hpp>

Inheritance diagram for PaillierControllerPGM:

Collaboration diagram for PaillierControllerPGM:

Public Member Functions
	PaillierControllerPGM ()
	Default constructor.

	~PaillierControllerPGM ()
	Destructor.

void	init ()
	Initializes the controller.

const char *	getCFile () const
	Getter for the c_file attribute.

void	setCFile (char *newCFile)
	Setter for the c_file attribute.

void	checkParameters (char *arg_in[], int size_arg, bool param[])
	Check the parameters passed to the program.

void	printHelp ()
	Print the man page message.

uint8_t	histogramExpansion (OCTET ImgPixel, bool recropPixels)
	Perform histogram expansion on an image pixel.

template<typename T_in , typename T_out >
void	encrypt (bool distributeOnTwo, bool recropPixels, Paillier< T_in, T_out > paillier)
	Encrypt an image using the Paillier cryptosystem.

template<typename T_in , typename T_out >
void	decrypt (bool distributeOnTwo, Paillier< T_in, T_out > paillier)
	Decrypt an image using the Paillier cryptosystem.

template<typename T_in , typename T_out >
void	encryptCompression (bool recropPixels, Paillier< T_in, T_out > paillier)
	Encrypt an image using the Paillier cryptosystem with compression.

uint16_t *	compressBits (uint16_t *ImgInEnc, int nb_lignes, int nb_colonnes)
	This function compresses the encrypted bits of an image.

uint16_t *	decompressBits (uint16_t *ImgInEnc, int nb_lignes, int nb_colonnes, int nTailleOriginale)
	Method to decompress an encrypted 8-bit PGM image.

pair< int, int >	decomposeDimension (int n)
	Method to decompose the dimensions of a compressed image.

template<typename T_in , typename T_out >
void	decryptCompression (Paillier< T_in, T_out > paillier)
	Method to decrypt an 8-bit PGM image with compression.

Public Member Functions inherited from PaillierController
PaillierModel *	getModel ()
	Gets the model.

commandLineInterface *	getView ()
	Gets the view.

const char *	getCKeyFile () const
	Gets the key file.

void	setCKeyFile (char *newCKeyFile)
	Sets the key file.

void	generateAndSaveKeyPair ()
	Generates and saves the key pair.

void	readKeyFile (bool isEncryption)
	Reads the key file.

Additional Inherited Members
Protected Member Functions inherited from PaillierController
bool	endsWith (const std::string &str, const std::string &suffix)
	Checks if the given string ends with the specified suffix.

void	convertToLower (char *arg_in[], int size_arg_in)
	Converts the given arguments to lower case.

bool	isPrime (uint64_t n, uint64_t i=2)
	Checks if the given number is prime.

uint64_t	check_p_q_arg (char *arg)
	Checks if the given argument is a prime number.

	PaillierController ()
	Constructor for PaillierController.

	~PaillierController ()
	Destructor for PaillierController.

Protected Attributes inherited from PaillierController
char *	c_key_file
	Pointer to the key file.

PaillierModel *	model = PaillierModel::getInstance()
	Instance of PaillierModel.

commandLineInterface *	view = commandLineInterface::getInstance()
	Instance of commandLineInterface.

Detailed Description

Controller for the Paillier cryptosystem applied to PGM images.

This class is responsible for controlling the Paillier cryptosystem applied to PGM images. It inherits from the PaillierController class and provides additional functionalities specific to PGM images.

Author: Katia Auxilien

Date: 29 May 2024, 13:55:00

Constructor & Destructor Documentation

◆ PaillierControllerPGM()

PaillierControllerPGM::PaillierControllerPGM ( )

Default constructor.

This constructor initializes the PaillierControllerPGM object with default values.

Author: Katia Auxilien

Date: 29 May 2024, 13:55:00

◆ ~PaillierControllerPGM()

PaillierControllerPGM::~PaillierControllerPGM ( )

Destructor.

This destructor frees the memory allocated by the PaillierControllerPGM object.

Author: Katia Auxilien

Date: 29 May 2024, 13:55:00

Member Function Documentation

◆ checkParameters()

void PaillierControllerPGM::checkParameters	(	char *	arg_in[],
		int	size_arg,
		bool	param[] )

Check the parameters passed to the program.

This method checks the parameters passed to the program and sets the corresponding attributes of the PaillierControllerPGM object.

Parameters

arg_in	An array of char pointers containing the arguments passed to the program.
size_arg	The size of the arg_in array.
bool	param[] array of flags to be set based on the command line arguments. 0 bool isEncryption = false ; 1 bool useKeys = false; 2 bool distributeOnTwo = false; 3 bool recropPixels = false; 4 bool optimisationLSB = false;

Authors: Katia Auxilien

Date: 29 May 2024, 13:55:00

◆ compressBits()

uint16_t * PaillierControllerPGM::compressBits	(	uint16_t *	ImgInEnc,
		int	nb_lignes,
		int	nb_colonnes )

This function compresses the encrypted bits of an image.

The function takes an encrypted image represented as a 2D array of 16-bit unsigned integers, and its dimensions (number of rows and columns). It compresses the encrypted bits of the image using a bit-packing technique, where each 16-bit integer is packed into 11 bits, and returns the compressed image as a new 2D array of 16-bit unsigned integers. The function also updates the number of columns of the compressed image to reflect the new size.

Parameters

ImgInEnc	A 2D array of 16-bit unsigned integers representing the encrypted image to be compressed.
nb_lignes	An integer representing the number of rows of the encrypted image.
nb_colonnes	An integer representing the number of columns of the encrypted image.

Returns: A 2D array of 16-bit unsigned integers representing the compressed encrypted image.

Authors: Katia Auxilien

Date: 29 May 2024, 13:55:00

◆ decomposeDimension()

pair< int, int > PaillierControllerPGM::decomposeDimension ( int n )

Method to decompose the dimensions of a compressed image.

This method decomposes the dimensions of a compressed image into its height and width components.

Parameters

int	n size of the compressed image in pixels.

Returns: pair<int, int> pair containing the height and width of the decomposed image.

Author: Katia Auxilien

Date: 29 mai 2024, 13:55:00

◆ decompressBits()

uint16_t * PaillierControllerPGM::decompressBits	(	uint16_t *	ImgInEnc,
		int	nb_lignes,
		int	nb_colonnes,
		int	nTailleOriginale )

Method to decompress an encrypted 8-bit PGM image.

This method decompresses an encrypted 8-bit PGM image that was previously compressed using the encryptCompression method.

Parameters

uint16_t	*ImgInEnc pointer to the encrypted and compressed image data.
int	nb_lignes number of rows in the image.
int	nb_colonnes number of columns in the image.

Returns: uint16_t* pointer to the decompressed image data.

Author: Katia Auxilien

Date: 29 mai 2024, 13:55:00

◆ decrypt()

template<typename T_in , typename T_out >

void PaillierControllerPGM::decrypt	(	bool	distributeOnTwo,
		Paillier< T_in, T_out >	paillier )

Decrypt an image using the Paillier cryptosystem.

This method decrypts an image using the Paillier cryptosystem and writes the decrypted image to a file.

Template Parameters

T_in	The input integer type.
T_out	The output integer type.

Parameters

distributeOnTwo	A bool value indicating whether the encrypted pixels were distributed over two bytes.
paillier	A Paillier object used for decryption.

Author: Katia Auxilien

Date: 29 May 2024, 13:55:00

◆ decryptCompression()

template<typename T_in , typename T_out >

void PaillierControllerPGM::decryptCompression ( Paillier< T_in, T_out > paillier )

Method to decrypt an 8-bit PGM image with compression.

This method decrypts an 8-bit PGM image that was previously encrypted using the encryptCompression method and performs decompression on the decrypted image before writing it to a file.

Template Parameters

T_in	input integer type for Paillier cryptosystem.
T_out	output integer type for Paillier cryptosystem.

Parameters

Paillier<T_in,T_out> paillier instance of the Paillier cryptosystem.

Author: Katia Auxilien

Date: 29 mai 2024, 13:55:00

◆ encrypt()

template<typename T_in , typename T_out >

void PaillierControllerPGM::encrypt	(	bool	distributeOnTwo,
		bool	recropPixels,
		Paillier< T_in, T_out >	paillier )

Encrypt an image using the Paillier cryptosystem.

This method encrypts an image using the Paillier cryptosystem and writes the encrypted image to a file.

Template Parameters

T_in	The input integer type.
T_out	The output integer type.

Parameters

distributeOnTwo	A bool value indicating whether to distribute the encrypted pixels over two bytes.
recropPixels	A bool value indicating whether to recrop the pixels.
paillier	A Paillier object used for encryption.

Author: Katia Auxilien

Date: 29 May 2024, 13:55:00

◆ encryptCompression()

template<typename T_in , typename T_out >

void PaillierControllerPGM::encryptCompression	(	bool	recropPixels,
		Paillier< T_in, T_out >	paillier )

Encrypt an image using the Paillier cryptosystem with compression.

This method encrypts an image using the Paillier cryptosystem with compression and writes the encrypted image to a file.

Template Parameters

T_in	The input integer type.
T_out	The output integer type.

Parameters

recropPixels	A bool value indicating whether to recrop the pixels.
paillier	A Paillier object used for encryption.

Author: Katia Auxilien

Date: 29 May 2024, 13:55:00

◆ getCFile()

const char * PaillierControllerPGM::getCFile ( ) const

Getter for the c_file attribute.

This method returns the value of the c_file attribute.

Returns: A constant pointer to the char array containing the file name.

Author: Katia Auxilien

Date: 29 May 2024, 13:55:00

◆ histogramExpansion()

uint8_t PaillierControllerPGM::histogramExpansion	(	OCTET	ImgPixel,
		bool	recropPixels )

Perform histogram expansion on an image pixel.

This method performs histogram expansion on an image pixel to increase the dynamic range of the image.

Parameters

ImgPixel	The input image pixel.
recropPixels	A bool value indicating whether to recrop the pixels.

Returns: The histogram-expanded image pixel.

Author: Katia Auxilien

Date: 29 May 2024, 13:55:00

◆ init()

void PaillierControllerPGM::init ( )

virtual

Initializes the controller.

This is a virtual function that can be overridden in derived classes to perform specific initialization tasks.

Author: Katia Auxilien

Date: 30 April 2024

Reimplemented from PaillierController.

◆ printHelp()

void PaillierControllerPGM::printHelp ( )

Print the man page message.

This method prints the help message for the program.

Author: Katia Auxilien

Date: 29 May 2024, 13:55:00

◆ setCFile()

void PaillierControllerPGM::setCFile ( char * newCFile )

Setter for the c_file attribute.

This method sets the value of the c_file attribute.

Parameters

newCFile A pointer to the char array containing the new file name.

Author: Katia Auxilien

Date: 29 May 2024, 13:55:00

Public Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ PaillierControllerPGM()

◆ ~PaillierControllerPGM()

Member Function Documentation

◆ checkParameters()

◆ compressBits()

◆ decomposeDimension()

◆ decompressBits()

◆ decrypt()

◆ decryptCompression()

◆ encrypt()

◆ encryptCompression()

◆ getCFile()

◆ histogramExpansion()

◆ init()

◆ printHelp()

◆ setCFile()