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CODEX_VSS::SubshareLabel< _ShareLabel > Class Template Reference

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

#include <SubshareLabel.h>

Inheritance diagram for CODEX_VSS::SubshareLabel< _ShareLabel >:

[legend]Collaboration diagram for CODEX_VSS::SubshareLabel< _ShareLabel >:

[legend]List of all members.

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

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Detailed Description

template<class _ShareLabel>
class CODEX_VSS::SubshareLabel< _ShareLabel >

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 38 of file SubshareLabel.h.

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Member Typedef Documentation

template<class _ShareLabel> typedef ShareLabel::VType CODEX_VSS::SubshareLabel< _ShareLabel >::VType

Convenient short name for the verification reconstruction class. Explicit specialization of the template determines the precise behavior of VRecon. Definition at line 49 of file SubshareLabel.h. Referenced by CODEX_VSS::SubshareLabel< LabelType >::check(), and CODEX_VSS::SubshareLabel< LabelType >::verify().

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Member Function Documentation

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

Test a subshare against its validity information. This should be specialized for the type of share and function. Parameters: share  The subshare to test. func  The one-way function to apply to share. Definition at line 252 of file SubshareLabel.h.

template<class _ShareLabel> int CODEX_VSS::SubshareLabel< _ShareLabel >::cmp (  const SubshareLabel< _ShareLabel > &    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 SubshareLabel 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 146 of file SubshareLabel.h. Referenced by CODEX_VSS::SubshareLabel< LabelType >::operator!=(), CODEX_VSS::SubshareLabel< LabelType >::operator<(), CODEX_VSS::SubshareLabel< LabelType >::operator<=(), CODEX_VSS::SubshareLabel< LabelType >::operator==(), CODEX_VSS::SubshareLabel< LabelType >::operator>(), and CODEX_VSS::SubshareLabel< LabelType >::operator>=().

template<class _ShareLabel> virtual int CODEX_VSS::SubshareLabel< _ShareLabel >::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 258 of file SubshareLabel.h.

template<class _ShareLabel> virtual void* CODEX_VSS::SubshareLabel< _ShareLabel >::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 287 of file SubshareLabel.h. Referenced by CODEX_VSS::SubshareLabel< LabelType >::unmarshal().

template<class _ShareLabel> bool CODEX_VSS::SubshareLabel< _ShareLabel >::verify (  const OneWay &    func )  const [inline]

Check the consistency of the verification data. Parameters: func  The one-way function that can transform the shares into the validity checks. This is needed by VRecon. Returns: Whether or not VRecon returns a VType::ValueType equal to the corresponding element of the share label. Definition at line 236 of file SubshareLabel.h.

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

• SubshareLabel.h

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