Ed25519 signature algorithm. More...

#include <xed25519.h>

Inheritance diagram for ed25519Signer:

Public Types
typedef Integer	Element

Public Member Functions
	ed25519Signer ()
	Create an ed25519Signer object.

	ed25519Signer (const byte y[PUBLIC_KEYLENGTH], const byte x[SECRET_KEYLENGTH])
	Create an ed25519Signer object.

	ed25519Signer (const byte x[SECRET_KEYLENGTH])
	Create an ed25519Signer object.

	ed25519Signer (const Integer &y, const Integer &x)
	Create an ed25519Signer object.

	ed25519Signer (const Integer &x)
	Create an ed25519Signer object.

	ed25519Signer (const PKCS8PrivateKey &key)
	Create an ed25519Signer object.

	ed25519Signer (RandomNumberGenerator &rng)
	Create an ed25519Signer object.

	ed25519Signer (BufferedTransformation &params)
	Create an ed25519Signer object.

PrivateKey &	AccessKey ()
	Retrieves a reference to a Private Key.

PrivateKey &	AccessPrivateKey ()
	Retrieves a reference to a Private Key.

const PrivateKey &	GetKey () const
	Retrieves a reference to a Private Key.

const PrivateKey &	GetPrivateKey () const
	Retrieves a reference to a Private Key.

size_t	SignatureLength () const
	Provides the signature length if it only depends on the key.

size_t	MaxRecoverableLength () const
	Provides the length of longest message that can be recovered.

size_t	MaxRecoverableLengthFromSignatureLength (size_t signatureLength) const
	Provides the length of longest message that can be recovered from a signature of given length.

bool	IsProbabilistic () const
	Determines whether a signature scheme requires a random number generator.

bool	AllowNonrecoverablePart () const
	Determines whether the non-recoverable message part can be signed.

bool	RecoverablePartFirst () const
	Determines whether the recoverable part must be input before the non-recoverable part.

PK_MessageAccumulator *	NewSignatureAccumulator (RandomNumberGenerator &rng) const
	Create a new HashTransformation to accumulate the message to be signed.

void	InputRecoverableMessage (PK_MessageAccumulator &messageAccumulator, const byte *recoverableMessage, size_t recoverableMessageLength) const
	Input a recoverable message to an accumulator.

size_t	SignAndRestart (RandomNumberGenerator &rng, PK_MessageAccumulator &messageAccumulator, byte *signature, bool restart) const
	Sign and restart messageAccumulator.

size_t	SignStream (RandomNumberGenerator &rng, std::istream &stream, byte *signature) const
	Sign a stream.

Public Member Functions inherited from PK_Signer
virtual size_t	Sign (RandomNumberGenerator &rng, PK_MessageAccumulator messageAccumulator, byte signature) const
	Sign and delete the messageAccumulator.

virtual size_t	SignMessage (RandomNumberGenerator &rng, const byte message, size_t messageLen, byte signature) const
	Sign a message.

virtual size_t	SignMessageWithRecovery (RandomNumberGenerator &rng, const byte recoverableMessage, size_t recoverableMessageLength, const byte nonrecoverableMessage, size_t nonrecoverableMessageLength, byte *signature) const
	Sign a recoverable message.

Public Member Functions inherited from PK_SignatureScheme
virtual size_t	MaxSignatureLength (size_t recoverablePartLength=0) const
	Provides the maximum signature length produced given the length of the recoverable message part.

virtual bool	SignatureUpfront () const
	Determines whether the signature must be input before the message.

Public Member Functions inherited from PrivateKeyAlgorithm
CryptoMaterial &	AccessMaterial ()
	Retrieves a reference to a Private Key.

const CryptoMaterial &	GetMaterial () const
	Retrieves a reference to a Private Key.

Public Member Functions inherited from Algorithm
	Algorithm (bool checkSelfTestStatus=true)
	Interface for all crypto algorithms.

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

virtual std::string	AlgorithmProvider () const
	Retrieve the provider of this algorithm.

Public Member Functions inherited from Clonable
virtual Clonable *	Clone () const
	Copies this object.

Static Public Attributes
static const int	SECRET_KEYLENGTH = 32
	Size of the private key.

static const int	PUBLIC_KEYLENGTH = 32
	Size of the public key.

static const int	SIGNATURE_LENGTH = 64
	Size of the signature.

Detailed Description

Ed25519 signature algorithm.

Since: Crypto++ 8.0

Definition at line 498 of file xed25519.h.

Member Typedef Documentation

◆ Element

typedef Integer ed25519Signer::Element

Definition at line 511 of file xed25519.h.

Constructor & Destructor Documentation

◆ ~ed25519Signer()

virtual ed25519Signer::~ed25519Signer ( )

inlinevirtual

Definition at line 513 of file xed25519.h.

◆ ed25519Signer() [1/8]

ed25519Signer::ed25519Signer ( )

inline

Create an ed25519Signer object.

Definition at line 516 of file xed25519.h.

◆ ed25519Signer() [2/8]

ed25519Signer::ed25519Signer	(	const byte	y[PUBLIC_KEYLENGTH],
		const byte	x[SECRET_KEYLENGTH]
	)

Create an ed25519Signer object.

Parameters

y	public key
x	private key

This constructor creates an ed25519Signer object using existing parameters.

Note: The public key is not validated.

Definition at line 626 of file xed25519.cpp.

◆ ed25519Signer() [3/8]

ed25519Signer::ed25519Signer ( const byte x[SECRET_KEYLENGTH] )

Create an ed25519Signer object.

Parameters

x	private key

This constructor creates an ed25519Signer object using existing parameters. The public key is calculated from the private key.

Definition at line 633 of file xed25519.cpp.

◆ ed25519Signer() [4/8]

ed25519Signer::ed25519Signer	(	const Integer &	y,
		const Integer &	x
	)

Create an ed25519Signer object.

Parameters

y	public key
x	private key

This constructor creates an ed25519Signer object using existing parameters.

Note: The public key is not validated.

Definition at line 640 of file xed25519.cpp.

◆ ed25519Signer() [5/8]

ed25519Signer::ed25519Signer ( const Integer & x )

Create an ed25519Signer object.

Parameters

x	private key

This constructor creates an ed25519Signer object using existing parameters. The public key is calculated from the private key.

Definition at line 654 of file xed25519.cpp.

◆ ed25519Signer() [6/8]

ed25519Signer::ed25519Signer ( const PKCS8PrivateKey & key )

Create an ed25519Signer object.

Parameters

key	PKCS8 private key

This constructor creates an ed25519Signer object using existing private key.

Note: The keys are not validated.

Since: Crypto++ 8.6

Definition at line 666 of file xed25519.cpp.

◆ ed25519Signer() [7/8]

ed25519Signer::ed25519Signer ( RandomNumberGenerator & rng )

Create an ed25519Signer object.

Parameters

rng	RandomNumberGenerator derived class

This constructor creates a new ed25519Signer using the random number generator.

Definition at line 674 of file xed25519.cpp.

◆ ed25519Signer() [8/8]

ed25519Signer::ed25519Signer ( BufferedTransformation & params )

Create an ed25519Signer object.

Parameters

params public and private key

This constructor creates an ed25519Signer object using existing parameters. The params can be created with Save.

Note: The public key is not validated.

Definition at line 679 of file xed25519.cpp.

Member Function Documentation

◆ AccessKey()

PrivateKey & ed25519Signer::AccessKey ( )

inline

Retrieves a reference to a Private Key.

AccessKey() retrieves a non-const reference to a private key.

Definition at line 566 of file xed25519.h.

◆ AccessPrivateKey()

PrivateKey & ed25519Signer::AccessPrivateKey ( )

inlinevirtual

Retrieves a reference to a Private Key.

Returns: a reference the private key

Implements PrivateKeyAlgorithm.

Definition at line 567 of file xed25519.h.

◆ GetKey()

const PrivateKey & ed25519Signer::GetKey ( ) const

inline

Retrieves a reference to a Private Key.

AccessKey() retrieves a const reference to a private key.

Definition at line 571 of file xed25519.h.

◆ GetPrivateKey()

const PrivateKey & ed25519Signer::GetPrivateKey ( ) const

inlinevirtual

Retrieves a reference to a Private Key.

Returns: a const reference the private key

Reimplemented from PrivateKeyAlgorithm.

Definition at line 572 of file xed25519.h.

◆ SignatureLength()

size_t ed25519Signer::SignatureLength ( ) const

inlinevirtual

Provides the signature length if it only depends on the key.

Returns: the signature length if it only depends on the key, in bytes

SignatureLength() returns the signature length if it only depends on the key, otherwise 0.

Implements PK_SignatureScheme.

Definition at line 575 of file xed25519.h.

◆ MaxRecoverableLength()

size_t ed25519Signer::MaxRecoverableLength ( ) const

inlinevirtual

Provides the length of longest message that can be recovered.

Returns: the length of longest message that can be recovered, in bytes

MaxRecoverableLength() returns the length of longest message that can be recovered, or 0 if this signature scheme does not support message recovery.

Implements PK_SignatureScheme.

Definition at line 576 of file xed25519.h.

◆ MaxRecoverableLengthFromSignatureLength()

size_t ed25519Signer::MaxRecoverableLengthFromSignatureLength ( size_t signatureLength ) const

inlinevirtual

Provides the length of longest message that can be recovered from a signature of given length.

Parameters

signatureLength the length of the signature, in bytes

Returns: the length of longest message that can be recovered from a signature of given length, in bytes

MaxRecoverableLengthFromSignatureLength() returns the length of longest message that can be recovered from a signature of given length, or 0 if this signature scheme does not support message recovery.

Implements PK_SignatureScheme.

Definition at line 577 of file xed25519.h.

◆ IsProbabilistic()

bool ed25519Signer::IsProbabilistic ( ) const

inlinevirtual

Determines whether a signature scheme requires a random number generator.

Returns: true if the signature scheme requires a RandomNumberGenerator() to sign

if IsProbabilistic() returns false, then NullRNG() can be passed to functions that take RandomNumberGenerator().

Implements PK_SignatureScheme.

Definition at line 581 of file xed25519.h.

◆ AllowNonrecoverablePart()

bool ed25519Signer::AllowNonrecoverablePart ( ) const

inlinevirtual

Determines whether the non-recoverable message part can be signed.

Returns: true if the non-recoverable message part can be signed

Implements PK_SignatureScheme.

Definition at line 582 of file xed25519.h.

◆ RecoverablePartFirst()

bool ed25519Signer::RecoverablePartFirst ( ) const

inlinevirtual

Determines whether the recoverable part must be input before the non-recoverable part.

Returns: true if the recoverable part must be input before the non-recoverable part during signing

RecoverablePartFirst() determines whether you must input the recoverable part before the non-recoverable part during signing

Implements PK_SignatureScheme.

Definition at line 583 of file xed25519.h.

◆ NewSignatureAccumulator()

PK_MessageAccumulator * ed25519Signer::NewSignatureAccumulator ( RandomNumberGenerator & rng ) const

inlinevirtual

Create a new HashTransformation to accumulate the message to be signed.

Parameters

rng	a RandomNumberGenerator derived class

Returns: a pointer to a PK_MessageAccumulator

NewSignatureAccumulator() can be used with all signing methods. Sign() will automatically delete the accumulator pointer. The caller is responsible for deletion if a method is called that takes a reference.

Implements PK_Signer.

Definition at line 585 of file xed25519.h.

◆ InputRecoverableMessage()

void ed25519Signer::InputRecoverableMessage	(	PK_MessageAccumulator &	messageAccumulator,
		const byte *	recoverableMessage,
		size_t	recoverableMessageLength
	)		const

inlinevirtual

Input a recoverable message to an accumulator.

Parameters

messageAccumulator	a reference to a PK_MessageAccumulator
recoverableMessage	a pointer to the recoverable message part to be signed
recoverableMessageLength	the size of the recoverable message part

Implements PK_Signer.

Definition at line 589 of file xed25519.h.

◆ SignAndRestart()

size_t ed25519Signer::SignAndRestart	(	RandomNumberGenerator &	rng,
		PK_MessageAccumulator &	messageAccumulator,
		byte *	signature,
		bool	restart
	)		const

virtual

Sign and restart messageAccumulator.

Parameters

rng	a RandomNumberGenerator derived class
messageAccumulator	a pointer to a PK_MessageAccumulator derived class
signature	a block of bytes for the signature
restart	flag indicating whether the messageAccumulator should be restarted

Returns: actual signature length

Precondition: COUNTOF(signature) == MaxSignatureLength()

Implements PK_Signer.

Definition at line 684 of file xed25519.cpp.

◆ SignStream()

size_t ed25519Signer::SignStream	(	RandomNumberGenerator &	rng,
		std::istream &	stream,
		byte *	signature
	)		const

Sign a stream.

Parameters

rng	a RandomNumberGenerator derived class
stream	an std::istream derived class
signature	a block of bytes for the signature

Returns: actual signature length

SignStream() handles large streams. The Stream functions were added to ed25519 for signing and verifying files that are too large for a memory allocation. The functions are not present in other library signers and verifiers.

ed25519 is a deterministic signature scheme. IsProbabilistic() returns false and the random number generator can be NullRNG().

Precondition: COUNTOF(signature) == MaxSignatureLength()

Since: Crypto++ 8.1

Definition at line 699 of file xed25519.cpp.

Member Data Documentation

◆ SECRET_KEYLENGTH

const int ed25519Signer::SECRET_KEYLENGTH = 32

static

Size of the private key.

SECRET_KEYLENGTH is the size of the private key, in bytes.

Definition at line 502 of file xed25519.h.

◆ PUBLIC_KEYLENGTH

const int ed25519Signer::PUBLIC_KEYLENGTH = 32

static

Size of the public key.

PUBLIC_KEYLENGTH is the size of the public key, in bytes.

Definition at line 505 of file xed25519.h.

◆ SIGNATURE_LENGTH

const int ed25519Signer::SIGNATURE_LENGTH = 64

static

Size of the signature.

SIGNATURE_LENGTH is the size of the signature, in bytes. ed25519 is a DL-based signature scheme. The signature is the concatenation of r || s.

Definition at line 510 of file xed25519.h.

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

Public Types

Public Member Functions

Static Public Attributes

Detailed Description

Member Typedef Documentation

◆ Element

Constructor & Destructor Documentation

◆ ~ed25519Signer()

◆ ed25519Signer() [1/8]

◆ ed25519Signer() [2/8]

◆ ed25519Signer() [3/8]

◆ ed25519Signer() [4/8]

◆ ed25519Signer() [5/8]

◆ ed25519Signer() [6/8]

◆ ed25519Signer() [7/8]

◆ ed25519Signer() [8/8]

Member Function Documentation

◆ AccessKey()

◆ AccessPrivateKey()

◆ GetKey()

◆ GetPrivateKey()

◆ SignatureLength()

◆ MaxRecoverableLength()

◆ MaxRecoverableLengthFromSignatureLength()

◆ IsProbabilistic()

◆ AllowNonrecoverablePart()

◆ RecoverablePartFirst()

◆ NewSignatureAccumulator()

◆ InputRecoverableMessage()

◆ SignAndRestart()

◆ SignStream()

Member Data Documentation

◆ SECRET_KEYLENGTH

◆ PUBLIC_KEYLENGTH

◆ SIGNATURE_LENGTH