SAFER block cipher decryption operation. More...

#include <safer.h>

Inheritance diagram for SAFER::Dec:

Collaboration diagram for SAFER::Dec:

Public Member Functions
void	ProcessAndXorBlock (const byte inBlock, const byte xorBlock, byte *outBlock) const
	Encrypt or decrypt a block. More...

Public Member Functions inherited from SAFER::Base
unsigned int	OptimalDataAlignment () const
	Provides input and output data alignment for optimal performance. More...

void	UncheckedSetKey (const byte *userkey, unsigned int length, const NameValuePairs &params)
	Sets the key for this object without performing parameter validation. More...

Public Member Functions inherited from SimpleKeyingInterface
virtual	~SimpleKeyingInterface ()

virtual size_t	MinKeyLength () const =0
	Returns smallest valid key length. More...

virtual size_t	MaxKeyLength () const =0
	Returns largest valid key length. More...

virtual size_t	DefaultKeyLength () const =0
	Returns default key length. More...

virtual size_t	GetValidKeyLength (size_t keylength) const =0
	Returns a valid key length for the algorithm. More...

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

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...

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

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

void	ProcessBlock (const byte inBlock, byte outBlock) const
	Encrypt or decrypt a block. More...

void	ProcessBlock (byte *inoutBlock) const
	Encrypt or decrypt a block in place. More...

virtual unsigned int	BlockSize () const =0
	Provides the block size of the cipher. More...

virtual bool	IsPermutation () const
	returns true if this is a permutation (i.e. there is an inverse transformation) More...

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

virtual unsigned int	OptimalNumberOfParallelBlocks () const
	Determines the number of blocks that can be processed in parallel. More...

virtual size_t	AdvancedProcessBlocks (const byte inBlocks, const byte xorBlocks, byte *outBlocks, size_t length, word32 flags) const
	Encrypt and xor multiple blocks using additional flags. More...

CipherDir	GetCipherDirection () const
	Provides the direction of the cipher. 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...

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...

Public Types inherited from BlockTransformation
enum	FlagsForAdvancedProcessBlocks { BT_InBlockIsCounter =1, BT_DontIncrementInOutPointers =2, BT_XorInput =4, BT_ReverseDirection =8, BT_AllowParallel =16 }
	Bit flags that control AdvancedProcessBlocks() behavior. More...

Protected Member Functions inherited from SAFER::Base
virtual bool	Strengthened () const =0

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

Protected Member Functions inherited from SimpleKeyingInterface
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 inherited from SAFER::Base
SecByteBlock	keySchedule

Static Protected Attributes inherited from SAFER::Base
static const byte	exp_tab [256]

static const byte	log_tab [256]

Detailed Description

SAFER block cipher decryption operation.

Definition at line 45 of file safer.h.

Member Function Documentation

void SAFER::Dec::ProcessAndXorBlock	(	const byte *	inBlock,
		const byte *	xorBlock,
		byte *	outBlock
	)		const

virtual

Encrypt or decrypt a block.

Parameters

inBlock	the input message before processing
outBlock	the output message after processing
xorBlock	an optional XOR mask

ProcessAndXorBlock encrypts or decrypts inBlock, xor with xorBlock, and write to outBlock.

The size of the block is determined by the block cipher and its documentation. Use BLOCKSIZE at compile time, or BlockSize() at runtime.

Note: The message can be transformed in-place, or the buffers must not overlap

See also: FixedBlockSize, BlockCipherFinal from seckey.h and BlockSize()

Implements BlockTransformation.

Definition at line 131 of file safer.cpp.

Here is the call graph for this function:

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

src/cryptopp/safer.h
src/cryptopp/safer.cpp

Public Member Functions

Additional Inherited Members

Detailed Description

Member Function Documentation