InvertibleRWFunction Class Reference

#include <rw.h>

Inheritance diagram for InvertibleRWFunction:

List of all members.

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Detailed Description

_

Definition at line 41 of file rw.h.

Public Member Functions
void	Initialize (const Integer &n, const Integer &p, const Integer &q, const Integer &u)
void	Initialize (RandomNumberGenerator &rng, unsigned int modulusBits)
void	BERDecode (BufferedTransformation &bt)
void	DEREncode (BufferedTransformation &bt) const
Integer	CalculateInverse (RandomNumberGenerator &rng, const Integer &x) const
bool	Validate (RandomNumberGenerator &rng, unsigned int level) const
	check this object for errors
bool	GetVoidValue (const char *name, const std::type_info &valueType, void *pValue) const
	to be implemented by derived classes, users should use one of the above functions instead
void	AssignFrom (const NameValuePairs &source)
	assign values from source to this object
void	GenerateRandom (RandomNumberGenerator &rng, const NameValuePairs &alg)
const Integer &	GetPrime1 () const
const Integer &	GetPrime2 () const
const Integer &	GetMultiplicativeInverseOfPrime2ModPrime1 () const
void	SetPrime1 (const Integer &p)
void	SetPrime2 (const Integer &q)
void	SetMultiplicativeInverseOfPrime2ModPrime1 (const Integer &u)
void	Initialize (const Integer &n)
Integer	ApplyFunction (const Integer &x) const
Integer	PreimageBound () const
Integer	ImageBound () const
const Integer &	GetModulus () const
void	SetModulus (const Integer &n)
Integer	ApplyRandomizedFunction (RandomNumberGenerator &rng, const Integer &x) const
bool	IsRandomized () const
virtual Integer	MaxPreimage () const
virtual Integer	MaxImage () const
virtual void	ThrowIfInvalid (RandomNumberGenerator &rng, unsigned int level) const
	throws InvalidMaterial if this object fails Validate() test
virtual void	Save (BufferedTransformation &bt) const
	save key into a BufferedTransformation
virtual void	Load (BufferedTransformation &bt)
	load key from a BufferedTransformation
virtual bool	SupportsPrecomputation () const
	Returns: whether this object supports precomputation
virtual void	Precompute (unsigned int n)
	do precomputation
virtual void	LoadPrecomputation (BufferedTransformation &storedPrecomputation)
	retrieve previously saved precomputation
virtual void	SavePrecomputation (BufferedTransformation &storedPrecomputation) const
	save precomputation for later use
void	DoQuickSanityCheck () const
template<class T>
bool	GetThisObject (T &object) const
	get a copy of this object or a subobject of it
template<class T>
bool	GetThisPointer (T *&p) const
	get a pointer to this object, as a pointer to T
template<class T>
bool	GetValue (const char *name, T &value) const
	get a named value, returns true if the name exists
template<class T>
T	GetValueWithDefault (const char *name, T defaultValue) const
	get a named value, returns the default if the name doesn't exist
std::string	GetValueNames () const
	get a list of value names that can be retrieved
bool	GetIntValue (const char *name, int &value) const
	get a named value with type int
int	GetIntValueWithDefault (const char *name, int defaultValue) const
	get a named value with type int, with default
template<class T>
void	GetRequiredParameter (const char *className, const char *name, T &value) const
void	GetRequiredIntParameter (const char *className, const char *name, int &value) const
Integer	CalculateRandomizedInverse (RandomNumberGenerator &rng, const Integer &x) const
bool	IsRandomized () const
void	GenerateRandomWithKeySize (RandomNumberGenerator &rng, unsigned int keySize)
	calls the above function with a NameValuePairs object that just specifies "KeySize"
Static Public Member Functions
static void __cdecl	ThrowIfTypeMismatch (const char *name, const std::type_info &stored, const std::type_info &retrieving)
	used by derived classes to check for type mismatch
Protected Attributes
Integer	m_p
Integer	m_q
Integer	m_u
Integer	m_n

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Member Function Documentation

bool InvertibleRWFunction::Validate	(	RandomNumberGenerator &	rng,
		unsigned int	level
	)			const [virtual]

check this object for errors

Parameters:

level

denotes the level of thoroughness: 0 - using this object won't cause a crash or exception (rng is ignored) 1 - this object will probably function (encrypt, sign, etc.) correctly (but may not check for weak keys and such) 2 - make sure this object will function correctly, and do reasonable security checks 3 - do checks that may take a long time

Returns:

true if the tests pass

Reimplemented from RWFunction.

Definition at line 160 of file rw.cpp.

References Integer::IsPositive(), RWFunction::m_n, m_p, m_q, m_u, Integer::One(), and RWFunction::Validate().

void InvertibleRWFunction::AssignFrom

(

const NameValuePairs &

source

)

[virtual]

assign values from source to this object

Note:

This function can be used to create a public key from a private key.

Reimplemented from RWFunction.

Definition at line 185 of file rw.cpp.

void InvertibleRWFunction::GenerateRandom	(	RandomNumberGenerator &	rng,
		const NameValuePairs &	alg
	)			[virtual]

parameters: (ModulusSize)

Reimplemented from GeneratableCryptoMaterial.

Definition at line 88 of file rw.cpp.

References Integer::GenerateRandom(), NameValuePairs::GetIntValue(), Integer::InverseMod(), RWFunction::m_n, m_p, m_q, and m_u.

virtual void CryptoMaterial::Load

(

BufferedTransformation &

bt

)

[inline, virtual, inherited]

load key from a BufferedTransformation

Exceptions:

KeyingErr

if decode fails

Note:

Generally does not check that the key is valid. Call ValidateKey() or ThrowIfInvalidKey() to check that.

Reimplemented in InvertibleRSAFunction, ASN1CryptoMaterial< PrivateKey >, ASN1CryptoMaterial< DL_GroupParameters< Integer > >, and ASN1CryptoMaterial< PublicKey >.

Definition at line 1025 of file cryptlib.h.

virtual void CryptoMaterial::Precompute

(

unsigned int

n

)

[inline, virtual, inherited]

do precomputation

The exact semantics of Precompute() is varies, but typically it means calculate a table of n objects that can be used later to speed up computation.

Reimplemented in DL_GroupParameters< T >, DL_PrivateKeyImpl< GP >, DL_PublicKeyImpl< GP >, DL_GroupParameters< Integer >, DL_GroupParameters< typenameEcPrecomputation< EC >::Element >, DL_PrivateKeyImpl< DL_GroupParameters_EC< EC > >, and DL_PublicKeyImpl< DL_GroupParameters_EC< EC > >.

Definition at line 1034 of file cryptlib.h.

bool NameValuePairs::GetIntValue	(	const char *	name,
		int &	value
	)			const [inline, inherited]

get a named value with type int

used to ensure we don't accidentally try to get an unsigned int or some other type when we mean int (which is the most common case)

Definition at line 280 of file cryptlib.h.

Referenced by GenerateRandom(), InvertibleRSAFunction::GenerateRandom(), InvertibleRabinFunction::GenerateRandom(), InvertibleLUCFunction::GenerateRandom(), DL_GroupParameters_IntegerBased::GenerateRandom(), DL_GroupParameters_DSA::GenerateRandom(), InvertibleESIGNFunction::GenerateRandom(), and Integer::GenerateRandomNoThrow().

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

• rw.h
• rw.cpp

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