Unified Diffie-Hellman in GF(p) More...

#include <dh2.h>

Inheritance diagram for DH2:

Collaboration diagram for DH2:

Public Member Functions
virtual	~DH2 ()

	DH2 (SimpleKeyAgreementDomain &domain)
	Construct a DH2. More...

	DH2 (SimpleKeyAgreementDomain &staticDomain, SimpleKeyAgreementDomain &ephemeralDomain)
	Construct a DH2. More...

CryptoParameters &	AccessCryptoParameters ()
	Retrieves a reference to Crypto Parameters. More...

unsigned int	AgreedValueLength () const
	Provides the size of the agreed value. More...

unsigned int	StaticPrivateKeyLength () const
	Provides the size of the static private key. More...

unsigned int	StaticPublicKeyLength () const
	Provides the size of the static public key. More...

void	GenerateStaticPrivateKey (RandomNumberGenerator &rng, byte *privateKey) const
	Generate static private key in this domain. More...

void	GenerateStaticPublicKey (RandomNumberGenerator &rng, const byte privateKey, byte publicKey) const
	Generate a static public key from a private key in this domain. More...

void	GenerateStaticKeyPair (RandomNumberGenerator &rng, byte privateKey, byte publicKey) const
	Generate a static private/public key pair. More...

unsigned int	EphemeralPrivateKeyLength () const
	Provides the size of ephemeral private key. More...

unsigned int	EphemeralPublicKeyLength () const
	Provides the size of ephemeral public key. More...

void	GenerateEphemeralPrivateKey (RandomNumberGenerator &rng, byte *privateKey) const
	Generate ephemeral private key. More...

void	GenerateEphemeralPublicKey (RandomNumberGenerator &rng, const byte privateKey, byte publicKey) const
	Generate ephemeral public key. More...

void	GenerateEphemeralKeyPair (RandomNumberGenerator &rng, byte privateKey, byte publicKey) const
	Generate private/public key pair. More...

bool	Agree (byte agreedValue, const byte staticPrivateKey, const byte ephemeralPrivateKey, const byte staticOtherPublicKey, const byte *ephemeralOtherPublicKey, bool validateStaticOtherPublicKey=true) const
	Derive agreed value. More...

Public Member Functions inherited from AuthenticatedKeyAgreementDomain
virtual	~AuthenticatedKeyAgreementDomain ()

Public Member Functions inherited from KeyAgreementAlgorithm
virtual	~KeyAgreementAlgorithm ()

CryptoMaterial &	AccessMaterial ()
	Retrieves a reference to Crypto Parameters. More...

const CryptoMaterial &	GetMaterial () const
	Retrieves a reference to Crypto Parameters. More...

virtual const CryptoParameters &	GetCryptoParameters () const
	Retrieves a reference to Crypto Parameters. More...

Public Member Functions inherited from AsymmetricAlgorithm
virtual	~AsymmetricAlgorithm ()

void	BERDecode (BufferedTransformation &bt)
	Loads this object from a BufferedTransformation. More...

void	DEREncode (BufferedTransformation &bt) const
	Saves this object to a BufferedTransformation. More...

Public Member Functions inherited from Algorithm
virtual	~Algorithm ()

	Algorithm (bool checkSelfTestStatus=true)
	Interface for all crypto algorithms. More...

virtual std::string	AlgorithmName () const
	Provides the name of this algorithm. More...

Public Member Functions inherited from Clonable
virtual	~Clonable ()

virtual Clonable *	Clone () const
	Copies this object. More...

Protected Attributes
SimpleKeyAgreementDomain &	d1

SimpleKeyAgreementDomain &	d2

Detailed Description

Unified Diffie-Hellman in GF(p)

A Diffie-Hellman domain is a set of parameters that must be shared by two parties in a key agreement protocol, along with the algorithms for generating key pairs and deriving agreed values.

See also: AuthenticatedKeyAgreementDomain, Unified Diffie-Hellman

Since: Crypto++ 1.0

Definition at line 20 of file dh2.h.

Constructor & Destructor Documentation

virtual DH2::~DH2 ( )

inlinevirtual

Definition at line 23 of file dh2.h.

DH2::DH2 ( SimpleKeyAgreementDomain & domain )

inline

Construct a DH2.

Definition at line 26 of file dh2.h.

DH2::DH2	(	SimpleKeyAgreementDomain &	staticDomain,
		SimpleKeyAgreementDomain &	ephemeralDomain
	)

inline

Construct a DH2.

Definition at line 29 of file dh2.h.

Member Function Documentation

CryptoParameters& DH2::AccessCryptoParameters ( )

inlinevirtual

Retrieves a reference to Crypto Parameters.

Returns: a reference the crypto parameters

Implements KeyAgreementAlgorithm.

Definition at line 32 of file dh2.h.

bool DH2::Agree	(	byte *	agreedValue,
		const byte *	staticPrivateKey,
		const byte *	ephemeralPrivateKey,
		const byte *	staticOtherPublicKey,
		const byte *	ephemeralOtherPublicKey,
		bool	validateStaticOtherPublicKey = `true`
	)		const

virtual

Derive agreed value.

Parameters

agreedValue	a byte buffer for the shared secret
staticPrivateKey	a byte buffer with your static private key in this domain
ephemeralPrivateKey	a byte buffer with your ephemeral private key in this domain
staticOtherPublicKey	a byte buffer with the other party's static public key in this domain
ephemeralOtherPublicKey	a byte buffer with the other party's ephemeral public key in this domain
validateStaticOtherPublicKey	a flag indicating if the other party's public key should be validated

Returns: true upon success, false in case of failure

Agree() derives an agreed value from your private keys and couterparty's public keys.

The other party's ephemeral public key is validated by default. If you have previously validated the static public key, use validateStaticOtherPublicKey=false to save time.

Precondition: COUNTOF(agreedValue) == AgreedValueLength(); COUNTOF(staticPrivateKey) == StaticPrivateKeyLength(); COUNTOF(ephemeralPrivateKey) == EphemeralPrivateKeyLength(); COUNTOF(staticOtherPublicKey) == StaticPublicKeyLength(); COUNTOF(ephemeralOtherPublicKey) == EphemeralPublicKeyLength()

Implements AuthenticatedKeyAgreementDomain.

Definition at line 15 of file dh2.cpp.

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unsigned int DH2::AgreedValueLength ( ) const

inlinevirtual

Provides the size of the agreed value.

Returns: size of agreed value produced in this domain

Implements AuthenticatedKeyAgreementDomain.

Definition at line 34 of file dh2.h.

unsigned int DH2::EphemeralPrivateKeyLength ( ) const

inlinevirtual

Provides the size of ephemeral private key.

Returns: the size of ephemeral private key in this domain

Implements AuthenticatedKeyAgreementDomain.

Definition at line 48 of file dh2.h.

unsigned int DH2::EphemeralPublicKeyLength ( ) const

inlinevirtual

Provides the size of ephemeral public key.

Returns: the size of ephemeral public key in this domain

Implements AuthenticatedKeyAgreementDomain.

Definition at line 50 of file dh2.h.

void DH2::GenerateEphemeralKeyPair	(	RandomNumberGenerator &	rng,
		byte *	privateKey,
		byte *	publicKey
	)		const

inlinevirtual

Generate private/public key pair.

Parameters

rng	a RandomNumberGenerator derived class
privateKey	a byte buffer for the generated private key in this domain
publicKey	a byte buffer for the generated public key in this domain

GenerateEphemeralKeyPair() is equivalent to calling GenerateEphemeralPrivateKey() and then GenerateEphemeralPublicKey()

Reimplemented from AuthenticatedKeyAgreementDomain.

Definition at line 56 of file dh2.h.

void DH2::GenerateEphemeralPrivateKey	(	RandomNumberGenerator &	rng,
		byte *	privateKey
	)		const

inlinevirtual

Generate ephemeral private key.

Parameters

rng	a RandomNumberGenerator derived class
privateKey	a byte buffer for the generated private key in this domain

Precondition: COUNTOF(privateKey) == PrivateEphemeralKeyLength()

Implements AuthenticatedKeyAgreementDomain.

Definition at line 52 of file dh2.h.

void DH2::GenerateEphemeralPublicKey	(	RandomNumberGenerator &	rng,
		const byte *	privateKey,
		byte *	publicKey
	)		const

inlinevirtual

Generate ephemeral public key.

Parameters

rng	a RandomNumberGenerator derived class
privateKey	a byte buffer for the generated private key in this domain
publicKey	a byte buffer for the generated public key in this domain

Precondition: COUNTOF(publicKey) == PublicEphemeralKeyLength()

Implements AuthenticatedKeyAgreementDomain.

Definition at line 54 of file dh2.h.

void DH2::GenerateStaticKeyPair	(	RandomNumberGenerator &	rng,
		byte *	privateKey,
		byte *	publicKey
	)		const

inlinevirtual

Generate a static private/public key pair.

Parameters

rng	a RandomNumberGenerator derived class
privateKey	a byte buffer for the generated private key in this domain
publicKey	a byte buffer for the generated public key in this domain

GenerateStaticKeyPair() is equivalent to calling GenerateStaticPrivateKey() and then GenerateStaticPublicKey().

Precondition: COUNTOF(privateKey) == PrivateStaticKeyLength(); COUNTOF(publicKey) == PublicStaticKeyLength()

Reimplemented from AuthenticatedKeyAgreementDomain.

Definition at line 45 of file dh2.h.

void DH2::GenerateStaticPrivateKey	(	RandomNumberGenerator &	rng,
		byte *	privateKey
	)		const

inlinevirtual

Generate static private key in this domain.

Parameters

rng	a RandomNumberGenerator derived class
privateKey	a byte buffer for the generated private key in this domain

Precondition: COUNTOF(privateKey) == PrivateStaticKeyLength()

Implements AuthenticatedKeyAgreementDomain.

Definition at line 41 of file dh2.h.

void DH2::GenerateStaticPublicKey	(	RandomNumberGenerator &	rng,
		const byte *	privateKey,
		byte *	publicKey
	)		const

inlinevirtual

Generate a static public key from a private key in this domain.

Parameters

rng	a RandomNumberGenerator derived class
privateKey	a byte buffer with the previously generated private key
publicKey	a byte buffer for the generated public key in this domain