Block cipher mode of operation information. More...

#include <modes.h>

Inheritance diagram for CipherModeBase:

Collaboration diagram for CipherModeBase:

Public Member Functions
virtual	~CipherModeBase ()

size_t	MinKeyLength () const
	Returns smallest valid key length. More...

size_t	MaxKeyLength () const
	Returns largest valid key length. More...

size_t	DefaultKeyLength () const
	Returns default key length. More...

size_t	GetValidKeyLength (size_t n) const
	Returns a valid key length for the algorithm. More...

bool	IsValidKeyLength (size_t n) const
	Returns whether keylength is a valid key length. More...

unsigned int	OptimalDataAlignment () const
	Provides input and output data alignment for optimal performance. More...

unsigned int	IVSize () const
	Returns length of the IV accepted by this object. More...

virtual IV_Requirement	IVRequirement () const =0
	Minimal requirement for secure IVs. More...

void	SetCipher (BlockCipher &cipher)

void	SetCipherWithIV (BlockCipher &cipher, const byte *iv, int feedbackSize=0)

Public Member Functions inherited from SimpleKeyingInterface
virtual	~SimpleKeyingInterface ()

virtual void	SetKey (const byte *key, size_t length, const NameValuePairs &params=g_nullNameValuePairs)
	Sets or reset the key of this object. More...

void	SetKeyWithRounds (const byte *key, size_t length, int rounds)
	Sets or reset the key of this object. More...

void	SetKeyWithIV (const byte key, size_t length, const byte iv, size_t ivLength)
	Sets or reset the key of this object. More...

void	SetKeyWithIV (const byte key, size_t length, const byte iv)
	Sets or reset the key of this object. More...

bool	IsResynchronizable () const
	Determines if the object can be resynchronized. More...

bool	CanUseRandomIVs () const
	Determines if the object can use random IVs. More...

bool	CanUsePredictableIVs () const
	Determines if the object can use random but possibly predictable IVs. More...

bool	CanUseStructuredIVs () const
	Determines if the object can use structured IVs. More...

unsigned int	DefaultIVLength () const
	Provides the default size of an IV. More...

virtual unsigned int	MinIVLength () const
	Provides the minimum size of an IV. More...

virtual unsigned int	MaxIVLength () const
	Provides the maximum size of an IV. More...

virtual void	Resynchronize (const byte *iv, int ivLength=-1)
	Resynchronize with an IV. More...

virtual void	GetNextIV (RandomNumberGenerator &rng, byte *iv)
	Retrieves a secure IV for the next message. More...

Public Member Functions inherited from StreamTransformation
virtual	~StreamTransformation ()

StreamTransformation &	Ref ()
	Provides a reference to this object. More...

virtual unsigned int	MandatoryBlockSize () const
	Provides the mandatory block size of the cipher. More...

virtual unsigned int	OptimalBlockSize () const
	Provides the input block size most efficient for this cipher. More...

virtual unsigned int	GetOptimalBlockSizeUsed () const
	Provides the number of bytes used in the current block when processing at optimal block size. More...

virtual void	ProcessData (byte outString, const byte inString, size_t length)=0
	Encrypt or decrypt an array of bytes. More...

virtual void	ProcessLastBlock (byte outString, const byte inString, size_t length)
	Encrypt or decrypt the last block of data. More...

virtual unsigned int	MinLastBlockSize () const
	Provides the size of the last block. More...

void	ProcessString (byte *inoutString, size_t length)
	Encrypt or decrypt a string of bytes. More...

void	ProcessString (byte outString, const byte inString, size_t length)
	Encrypt or decrypt a string of bytes. More...

byte	ProcessByte (byte input)
	Encrypt or decrypt a byte. More...

virtual bool	IsRandomAccess () const =0
	Determines whether the cipher supports random access. More...

virtual void	Seek (lword pos)
	Seek to an absolute position. More...

virtual bool	IsSelfInverting () const =0
	Determines whether the cipher is self-inverting. More...

virtual bool	IsForwardTransformation () const =0
	Determines if the cipher is being operated in its forward direction. 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 Member Functions
	CipherModeBase ()

unsigned int	BlockSize () const

virtual void	SetFeedbackSize (unsigned int feedbackSize)

virtual void	ResizeBuffers ()

Protected Member Functions inherited from SymmetricCipher
const Algorithm &	GetAlgorithm () const
	Returns the base class Algorithm. More...

Protected Member Functions inherited from SimpleKeyingInterface
virtual void	UncheckedSetKey (const byte *key, unsigned int length, const NameValuePairs &params)=0
	Sets the key for this object without performing parameter validation. More...

void	ThrowIfInvalidKeyLength (size_t length)
	Validates the key length. More...

void	ThrowIfResynchronizable ()
	Validates the object. More...

void	ThrowIfInvalidIV (const byte *iv)
	Validates the IV. More...

size_t	ThrowIfInvalidIVLength (int length)
	Validates the IV length. More...

const byte *	GetIVAndThrowIfInvalid (const NameValuePairs &params, size_t &size)
	Retrieves and validates the IV. More...

void	AssertValidKeyLength (size_t length) const
	Validates the key length. More...

Protected Attributes
BlockCipher *	m_cipher

AlignedSecByteBlock	m_register

Additional Inherited Members
Public Types inherited from SimpleKeyingInterface
enum	IV_Requirement { UNIQUE_IV = 0, RANDOM_IV, UNPREDICTABLE_RANDOM_IV, INTERNALLY_GENERATED_IV, NOT_RESYNCHRONIZABLE }
	Secure IVs requirements as enumerated values. More...

Detailed Description

Block cipher mode of operation information.

Definition at line 43 of file modes.h.

Constructor & Destructor Documentation

virtual CipherModeBase::~CipherModeBase ( )

inlinevirtual

Definition at line 46 of file modes.h.

CipherModeBase::CipherModeBase ( )

inlineprotected

Definition at line 76 of file modes.h.

Member Function Documentation

unsigned int CipherModeBase::BlockSize ( ) const

inlineprotected

Definition at line 77 of file modes.h.

Here is the caller graph for this function:

size_t CipherModeBase::DefaultKeyLength ( ) const

inlinevirtual

Returns default key length.

Returns: the default (recommended) key length, in bytes

Implements SimpleKeyingInterface.

Definition at line 49 of file modes.h.

size_t CipherModeBase::GetValidKeyLength ( size_t keylength ) const

inlinevirtual

Returns a valid key length for the algorithm.

Parameters

keylength the size of the key, in bytes

Returns: the valid key length, in bytes

keylength is provided in bytes, not bits. If keylength is less than MIN_KEYLENGTH, then the function returns MIN_KEYLENGTH. If keylength is greater than MAX_KEYLENGTH, then the function returns MAX_KEYLENGTH. if If keylength is a multiple of KEYLENGTH_MULTIPLE, then keylength is returned. Otherwise, the function returns a lower multiple of KEYLENGTH_MULTIPLE.

Implements SimpleKeyingInterface.

Definition at line 50 of file modes.h.

bool CipherModeBase::IsValidKeyLength ( size_t keylength ) const

inlinevirtual

Returns whether keylength is a valid key length.

Parameters

keylength the requested keylength

Returns: true if keylength is valid, false otherwise

Internally the function calls GetValidKeyLength()

Reimplemented from SimpleKeyingInterface.

Definition at line 51 of file modes.h.

virtual IV_Requirement CipherModeBase::IVRequirement ( ) const

pure virtual

Minimal requirement for secure IVs.

Returns: the secure IV requirement of the algorithm

Implements SimpleKeyingInterface.

Implemented in CBC_ModeBase, ECB_OneWay, CTR_ModePolicy, OFB_ModePolicy, and CFB_ModePolicy.

unsigned int CipherModeBase::IVSize ( ) const

inlinevirtual

Returns length of the IV accepted by this object.

Returns: the size of an IV, in bytes

Exceptions

NotImplemented() if the object does not support resynchronization

The default implementation throws NotImplemented

Reimplemented from SimpleKeyingInterface.

Definition at line 55 of file modes.h.

Here is the call graph for this function:

size_t CipherModeBase::MaxKeyLength ( ) const

inlinevirtual

Returns largest valid key length.

Returns: the maximum key length, in bytes

Implements SimpleKeyingInterface.

Definition at line 48 of file modes.h.

size_t CipherModeBase::MinKeyLength ( ) const

inlinevirtual

Returns smallest valid key length.

Returns: the minimum key length, in bytes

Implements SimpleKeyingInterface.

Definition at line 47 of file modes.h.

unsigned int CipherModeBase::OptimalDataAlignment ( ) const

inlinevirtual

Provides input and output data alignment for optimal performance.

Returns: the input data alignment that provides optimal performance

Reimplemented from StreamTransformation.

Reimplemented in AdditiveCipherTemplate< AbstractPolicyHolder< AdditiveCipherAbstractPolicy, CTR_ModePolicy > >.

Definition at line 53 of file modes.h.

void CipherModeBase::ResizeBuffers ( )

protectedvirtual

Reimplemented in CBC_Decryption, BlockOrientedCipherModeBase, and CFB_ModePolicy.

Definition at line 28 of file modes.cpp.

Here is the call graph for this function:

Here is the caller graph for this function:

void CipherModeBase::SetCipher ( BlockCipher & cipher )

inline

Definition at line 58 of file modes.h.

Here is the call graph for this function:

void CipherModeBase::SetCipherWithIV	(	BlockCipher &	cipher,
		const byte *	iv,
		int	feedbackSize = `0`
	)

inline

Definition at line 65 of file modes.h.

Here is the call graph for this function:

Here is the caller graph for this function:

virtual void CipherModeBase::SetFeedbackSize ( unsigned int feedbackSize )

inlineprotectedvirtual

Reimplemented in CFB_ModePolicy.

Definition at line 78 of file modes.h.

Member Data Documentation

BlockCipher* CipherModeBase::m_cipher

protected

Definition at line 86 of file modes.h.

AlignedSecByteBlock CipherModeBase::m_register

protected

Definition at line 87 of file modes.h.

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

src/cryptopp/modes.h
src/cryptopp/modes.cpp

Public Member Functions

Protected Member Functions

Protected Attributes

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation

Member Data Documentation