elGamal::ArrayOfCiphers Class Reference

Implements an array containing several ciphers. More...

#include <arrayofciphers.hpp>

Collaboration diagram for elGamal::ArrayOfCiphers:

Public Member Functions
	ArrayOfCiphers (verifierUtils::ByteTree *bt, CipherGroup c)
	Builds an array from the content of a bytetree and the group in which the ciphers are.
	ArrayOfCiphers (arithm::ArrayOfElmts left, arithm::ArrayOfElmts right)
	Builds an array by setting directly its two attributes.
verifierUtils::ByteTree *	toByteTree ()
	Returns a node containing the bytetree representations of the ciphertexts stored in this instance.
arithm::ArrayOfElmts	getUarray ()
	Returns the u attribute.
arithm::ArrayOfElmts	getVarray ()
	Returns the v attribute.
CipherText	getCipherText (unsigned int index)
	Returns the ciphertext at index.
unsigned int	size ()
	Returns the size of the array.

Private Attributes
arithm::ArrayOfElmts	u
	The "u" part of every ciphertext, i.e. their left hand side.
arithm::ArrayOfElmts	v
	The "v" part of every ciphertext, i.e. their right hand side.

Detailed Description

Implements an array containing several ciphers.

Actually, we cheat to in order to make use of the ArrayOfElmts class: the ciphertexts are not stored as CipherText instances. Instead, we have a first ArrayOfElmts containing the values of their u attribute and another for their v. CipherTexts are then built just before the output.

Definition at line 34 of file arrayofciphers.hpp.

Constructor & Destructor Documentation

ArrayOfCiphers::ArrayOfCiphers	(	verifierUtils::ByteTree *	bt,
		CipherGroup	c
	)

Builds an array from the content of a bytetree and the group in which the ciphers are.

The bytetree has to be a node containing the bytetree representations of the ciphertexts, NOT a Node containing the bytetree representation of two ArrayOfElmts's.

Definition at line 20 of file arrayofciphers.cpp.

{
        if ( (!bt->isNode()) || (bt->size() != 2) )
        {
                std::cout<<"ERROR: in ArrayOfCiphers(bt,c): bt is not a"
                         <<"Node or is not of size 2.\nbt=";
                bt->prettyPrint("");
                std::cout<<std::endl;
                exit(1);
        }
        arithm::ArrayOfElmts uPrime(bt->getChild(0),c.getGrp());
        arithm::ArrayOfElmts vPrime(bt->getChild(1),c.getGrp());
        u = uPrime;
        v = vPrime;
}

ArrayOfCiphers::ArrayOfCiphers	(	arithm::ArrayOfElmts	left,
		arithm::ArrayOfElmts	right
	)

Builds an array by setting directly its two attributes.

Definition at line 37 of file arrayofciphers.cpp.

                                                           :
        u(left), v(right)
{
        if (u.size() != v.size())
        {
                std::cout<<"ERROR: in ArrayOfCiphers(left,right), left"
                         <<"and right are not of the same size."
                         <<"\nleft.size()="<<left.size()
                         <<"\right.size()="<<right.size()
                         <<std::endl;
                exit(1);
        }