CFB block cipher mode of operation. More...

#include <modes.h>

Inheritance diagram for CFB_ModePolicy:

Collaboration diagram for CFB_ModePolicy:

Public Member Functions
CRYPTOPP_STATIC_CONSTEXPR const char *CRYPTOPP_API	StaticAlgorithmName ()

virtual	~CFB_ModePolicy ()

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

Public Member Functions inherited from CipherModeBase
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...

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...

Public Member Functions inherited from CFB_CipherAbstractPolicy
virtual	~CFB_CipherAbstractPolicy ()

Protected Member Functions
unsigned int	GetBytesPerIteration () const
	Provides number of bytes operated upon during an iteration. More...

byte *	GetRegisterBegin ()
	Access the feedback register. More...

bool	CanIterate () const
	Flag indicating iteration support. More...

void	Iterate (byte output, const byte input, CipherDir dir, size_t iterationCount)
	Iterate the cipher. More...

void	TransformRegister ()
	TODO. More...

void	CipherResynchronize (const byte *iv, size_t length)
	Resynchronize the cipher. More...

void	SetFeedbackSize (unsigned int feedbackSize)

void	ResizeBuffers ()

Protected Member Functions inherited from CipherModeBase
	CipherModeBase ()

unsigned int	BlockSize () const

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
SecByteBlock	m_temp

unsigned int	m_feedbackSize

Protected Attributes inherited from CipherModeBase
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

CFB block cipher mode of operation.

Definition at line 111 of file modes.h.

Constructor & Destructor Documentation

virtual CFB_ModePolicy::~CFB_ModePolicy ( )

inlinevirtual

Definition at line 116 of file modes.h.

Member Function Documentation

bool CFB_ModePolicy::CanIterate ( ) const

inlineprotectedvirtual

Flag indicating iteration support.

Returns: true if the cipher supports iteration, false otherwise

Reimplemented from CFB_CipherAbstractPolicy.

Definition at line 122 of file modes.h.

void CFB_ModePolicy::CipherResynchronize	(	const byte *	iv,
		size_t	length
	)

protectedvirtual

Resynchronize the cipher.

Parameters

iv	a byte array used to resynchronize the cipher
length	the size of the IV array

Reimplemented from CFB_CipherAbstractPolicy.

Definition at line 67 of file modes.cpp.

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unsigned int CFB_ModePolicy::GetBytesPerIteration ( ) const

inlineprotectedvirtual

Provides number of bytes operated upon during an iteration.

Returns: bytes operated upon during an iteration, in bytes

See also: GetOptimalBlockSize()

Implements CFB_CipherAbstractPolicy.

Definition at line 120 of file modes.h.

byte* CFB_ModePolicy::GetRegisterBegin ( )

inlineprotectedvirtual

Access the feedback register.

Returns: pointer to the first byte of the feedback register

Implements CFB_CipherAbstractPolicy.

Definition at line 121 of file modes.h.

void CFB_ModePolicy::Iterate	(	byte *	output,
		const byte *	input,
		CipherDir	dir,
		size_t	iterationCount
	)

protectedvirtual

Iterate the cipher.

Parameters

output	the output buffer
input	the input buffer
dir	the direction of the cipher
iterationCount	the number of iterations to perform on the input

See also: IsSelfInverting() and IsForwardTransformation()

Reimplemented from CFB_CipherAbstractPolicy.

Definition at line 33 of file modes.cpp.

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IV_Requirement CFB_ModePolicy::IVRequirement ( ) const

inlinevirtual

Minimal requirement for secure IVs.

Returns: the secure IV requirement of the algorithm

Implements CipherModeBase.

Definition at line 117 of file modes.h.

void CFB_ModePolicy::ResizeBuffers ( )

protectedvirtual

Reimplemented from CipherModeBase.

Definition at line 81 of file modes.cpp.

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void CFB_ModePolicy::SetFeedbackSize ( unsigned int feedbackSize )

protectedvirtual

Reimplemented from CipherModeBase.

Definition at line 74 of file modes.cpp.

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CRYPTOPP_STATIC_CONSTEXPR const char* CRYPTOPP_API CFB_ModePolicy::StaticAlgorithmName ( )

inline

Definition at line 114 of file modes.h.

void CFB_ModePolicy::TransformRegister ( )

protectedvirtual

TODO.

Implements CFB_CipherAbstractPolicy.

Definition at line 58 of file modes.cpp.

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Member Data Documentation

unsigned int CFB_ModePolicy::m_feedbackSize

protected

Definition at line 130 of file modes.h.

SecByteBlock CFB_ModePolicy::m_temp

protected

Definition at line 129 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