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CODEX_VSS::ShareLabel< _ShareType, _OneWay > Class Template Reference

Sharings are labelled as a means to distinguish different sharings of the same secret. More...

#include <ShareLabel.h>

Inheritance diagram for CODEX_VSS::ShareLabel< _ShareType, _OneWay >:

[legend]Collaboration diagram for CODEX_VSS::ShareLabel< _ShareType, _OneWay >:

[legend]List of all members.

Public Types
typedef _ShareType	ShareType
	Export the type of sharing.
typedef _OneWay	OneWay
	Export the type of one-way function used to construct the validity checks.
typedef VRecon< ShareType, OneWay >	VType
	Convenient short name for the verification reconstruction class.
Public Methods
	ShareLabel ()
	Default constructor.
	ShareLabel (int num, int version, int id, const ShareSet< ShareType > &shareSet, const OneWay &func)
	Constructor taking a share set and one-way function.
	ShareLabel (int num, int version, int id, const typename VType::ValueType vc[NumShares])
	Constructor taking a set of verification shares.
	ShareLabel (const ShareLabel< _ShareType, _OneWay > &aOther)
	Copy constructor.
virtual	~ShareLabel ()
	Virtual destructor.
void	operator= (const ShareLabel< _ShareType, _OneWay > &aOther)
	Assignment operator.
int	cmp (const ShareLabel< _ShareType, _OneWay > &aOther) const
	Generic comparator method.
bool	operator< (const ShareLabel< _ShareType, _OneWay > &aOther) const
	Less-than comparator.
bool	operator> (const ShareLabel< _ShareType, _OneWay > &aOther) const
	Greater-than comparator.
bool	operator== (const ShareLabel< _ShareType, _OneWay > &aOther) const
	Equality comparator.
bool	operator!= (const ShareLabel< _ShareType, _OneWay > &aOther) const
	Inequality comparator.
bool	operator<= (const ShareLabel< _ShareType, _OneWay > &aOther) const
	At-most (<=) comparator (equivalent to !>).
bool	operator>= (const ShareLabel< _ShareType, _OneWay > &aOther) const
	At-least (>=) comparator (equivalent to !<).
const CODEX_ASN1::Integer &	num () const
	Returns: The ID number of the shared secret.
const CODEX_ASN1::Integer &	version () const
	Returns: The version number of the corresponding sharing.
const CODEX_ASN1::Integer &	id () const
	Returns: The origin identifier for the corresponding sharing.
const VType::ValueType *	vc () const
	Returns: The validity checks for the corresponding sharing.
const VType::ValueType &	vc (unsigned int i) const
	Returns: A particular validity check for the corresponding sharing.
bool	verify (const typename VType::ValueType &vcs, const OneWay &func) const
	Check the consistency of the verification data.
bool	check (const ShareType &share, const OneWay &func) const
	Test a share against its validity information.
int	marshal (unsigned char **pp) const
	This function creates a serialized representation of the object, which is returned through the argument pp.
void *	unmarshal (void *bogus, unsigned char **pp, long length)
	This function takes a serialized representation of the object and recreates the object representation.
Static Public Attributes
const unsigned int	NumShares = ShareType::NumShares
	Number of shares.

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Detailed Description

template<class _ShareType, class _OneWay>
class CODEX_VSS::ShareLabel< _ShareType, _OneWay >

Sharings are labelled as a means to distinguish different sharings of the same secret.

This includes version and origin information as well as the public verification information. Because the verification data is included in the label, this is a natural place to test its validity, making the label both an indicator of a specific version and the proof that it corresponds to a valid sharing. The template parameters uniquely determine the type of sharing and the verification scheme, and these are then used to obtain the appropriate verification reconstruction class.

Definition at line 44 of file ShareLabel.h.

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Member Typedef Documentation

template<class _ShareType, class _OneWay> typedef VRecon< ShareType , OneWay > CODEX_VSS::ShareLabel< _ShareType, _OneWay >::VType

Convenient short name for the verification reconstruction class. Explicit specialization of the template determines the precise behavior of VRecon. Definition at line 59 of file ShareLabel.h.

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Member Function Documentation

template<class _ShareType, class _OneWay> bool CODEX_VSS::ShareLabel< _ShareType, _OneWay >::check (  const ShareType &    share, const OneWay &    func )  const [inline]

Test a share against its validity information. This should be specialized for the type of share and function. Parameters: share  The share to test. func  The one-way function to apply to share. Definition at line 274 of file ShareLabel.h. References CODEX_VSS::ShareLabel< _ShareType, _OneWay >::OneWay, and CODEX_VSS::ShareLabel< _ShareType, _OneWay >::ShareType.

template<class _ShareType, class _OneWay> int CODEX_VSS::ShareLabel< _ShareType, _OneWay >::cmp (  const ShareLabel< _ShareType, _OneWay > &    aOther )  const [inline]

Generic comparator method. The ordering is arbitrary, but deterministic. Since it's only used for sorting and finding purposes, this does not really matter. Parameters: aOther  A ShareLabel with which to compare this one. The assumed calling syntax for a and b is a.cmp(b) Return values: -1  a < b 0  a == b 1  a > b Definition at line 156 of file ShareLabel.h. References CODEX_VSS::ShareLabel< _ShareType, _OneWay >::m_id, CODEX_VSS::ShareLabel< _ShareType, _OneWay >::m_num, CODEX_VSS::ShareLabel< _ShareType, _OneWay >::m_vc, CODEX_VSS::ShareLabel< _ShareType, _OneWay >::m_version, CODEX_VSS::ShareLabel< _ShareType, _OneWay >::NumShares, and CODEX_ASN1::Integer::value(). Referenced by CODEX_VSS::SubshareLabel< LabelType >::cmp(), CODEX_VSS::ShareLabel< _ShareType, _OneWay >::operator!=(), CODEX_VSS::ShareLabel< _ShareType, _OneWay >::operator<(), CODEX_VSS::ShareLabel< _ShareType, _OneWay >::operator<=(), CODEX_VSS::ShareLabel< _ShareType, _OneWay >::operator==(), CODEX_VSS::ShareLabel< _ShareType, _OneWay >::operator>(), and CODEX_VSS::ShareLabel< _ShareType, _OneWay >::operator>=().

template<class _ShareType, class _OneWay> int CODEX_VSS::ShareLabel< _ShareType, _OneWay >::marshal (  unsigned char **    pp )  const [inline, virtual]

This function creates a serialized representation of the object, which is returned through the argument pp. This must be overridden by the concrete derived class. Parameters: pp  Serialized form of the object Returns: Length of the marshalled data Implements CODEX_ASN1::Base. Definition at line 280 of file ShareLabel.h. References CODEX_ASN1::Base::initialized(), CODEX_ASN1::Integer::marshal(), and CODEX_VSS::ShareLabel< _ShareType, _OneWay >::NumShares. Referenced by CODEX_VSS::SubshareLabel< LabelType >::marshal().

template<class _ShareType, class _OneWay> void* CODEX_VSS::ShareLabel< _ShareType, _OneWay >::unmarshal (  void *    bogus, unsigned char **    pp, long    length )  [inline, virtual]

This function takes a serialized representation of the object and recreates the object representation. This must be overridden by the concrete derived class. Parameters: bogus  Included for compatibility with OpenSSL ASN.1 macros pp  Serialized form of the data length  Number of bytes of pp to unmarshal Returns: success or failure of the unmarshalling Implements CODEX_ASN1::Base. Definition at line 312 of file ShareLabel.h. References CODEX_ASN1::Base::m_initialized, CODEX_VSS::ShareLabel< _ShareType, _OneWay >::NumShares, CODEX_VSS::ShareLabel< _ShareType, _OneWay >::unmarshal(), and CODEX_ASN1::Integer::unmarshal(). Referenced by CODEX_VSS::SubshareLabel< LabelType >::unmarshal(), and CODEX_VSS::ShareLabel< _ShareType, _OneWay >::unmarshal().

template<class _ShareType, class _OneWay> bool CODEX_VSS::ShareLabel< _ShareType, _OneWay >::verify (  const typename VType::ValueType &    vcs, const OneWay &    func )  const [inline]

Check the consistency of the verification data. Parameters: vcs  The validity check for the secret, which is publicly known. func  The one-way function that can transform the secret or the shares into vcs or the validity checks. This is needed by VRecon. Returns: Whether or not VRecon returns a VType::ValueType equal to vcs. Definition at line 258 of file ShareLabel.h. References CODEX_VSS::ShareLabel< _ShareType, _OneWay >::OneWay.

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

• ShareLabel.h

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