#include <arc4.h>

Inheritance diagram for Weak::ARC4_Base:

Public Types
typedef SymmetricCipherFinal< ARC4_Base >	Encryption

typedef SymmetricCipherFinal< ARC4_Base >	Decryption

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 SymmetricCipherDocumentation
typedef SymmetricCipher	Encryption
	implements the SymmetricCipher interface

typedef SymmetricCipher	Decryption
	implements the SymmetricCipher interface

Public Member Functions
void	GenerateBlock (byte *output, size_t size)
	Generate random array of bytes.

void	DiscardBytes (size_t n)
	Generate and discard n bytes.

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

bool	IsRandomAccess () const
	Determines whether the cipher supports random access.

bool	IsSelfInverting () const
	Determines whether the cipher is self-inverting.

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

Public Member Functions inherited from RandomNumberGenerator
virtual void	IncorporateEntropy (const byte *input, size_t length)
	Update RNG state with additional unpredictable values.

virtual bool	CanIncorporateEntropy () const
	Determines if a generator can accept additional entropy.

virtual byte	GenerateByte ()
	Generate new random byte and return it.

virtual unsigned int	GenerateBit ()
	Generate new random bit and return it.

virtual word32	GenerateWord32 (word32 min=0, word32 max=0xffffffffUL)
	Generate a random 32 bit word in the range min to max, inclusive.

virtual void	GenerateIntoBufferedTransformation (BufferedTransformation &target, const std::string &channel, lword length)
	Generate random bytes into a BufferedTransformation.

template<class IT >
void	Shuffle (IT begin, IT end)
	Randomly shuffle the specified array.

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.

Public Member Functions inherited from SimpleKeyingInterface
virtual size_t	MinKeyLength () const =0
	Returns smallest valid key length.

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

Public Member Functions inherited from StreamTransformation
StreamTransformation &	Ref ()
	Provides a reference to this object.

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

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

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

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

virtual size_t	ProcessLastBlock (byte outString, size_t outLength, const byte inString, size_t inLength)
	Encrypt or decrypt the last block of data.

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

virtual bool	IsLastBlockSpecial () const
	Determines if the last block receives special processing.

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

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

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

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

Static Public Member Functions
static const char *	StaticAlgorithmName ()

Static Public Member Functions inherited from VariableKeyLength< 16, 1, 256 >
static size_t	StaticGetValidKeyLength (size_t keylength)
	Provides a valid key length for the algorithm provided by a static function.

Additional Inherited Members
Static Public Attributes inherited from VariableKeyLength< 16, 1, 256 >
static const int	MIN_KEYLENGTH
	The minimum key length used by the algorithm provided as a constant.

static const int	MAX_KEYLENGTH
	The maximum key length used by the algorithm provided as a constant.

static const int	DEFAULT_KEYLENGTH
	The default key length used by the algorithm provided as a constant.

static const int	KEYLENGTH_MULTIPLE
	The key length multiple used by the algorithm provided as a constant.

static const int	IV_REQUIREMENT
	The default IV requirements for the algorithm provided as a constant.

static const int	IV_LENGTH
	The default initialization vector length for the algorithm provided as a constant.

Detailed Description

ARC4 base class.

Implementations and overrides in Base apply to both ENCRYPTION and DECRYPTION directions

Since: Crypto++ 3.1

Definition at line 22 of file arc4.h.

Member Typedef Documentation

◆ Encryption

typedef SymmetricCipherFinal<ARC4_Base> Weak::ARC4_Base::Encryption

Definition at line 38 of file arc4.h.

◆ Decryption

typedef SymmetricCipherFinal<ARC4_Base> Weak::ARC4_Base::Decryption

Definition at line 39 of file arc4.h.

Constructor & Destructor Documentation

◆ ~ARC4_Base()

ARC4_Base::~ARC4_Base ( )

Definition at line 23 of file arc4.cpp.

Member Function Documentation

◆ StaticAlgorithmName()

static const char * Weak::ARC4_Base::StaticAlgorithmName ( )

inlinestatic

Definition at line 27 of file arc4.h.

◆ GenerateBlock()

void ARC4_Base::GenerateBlock	(	byte *	output,
		size_t	size
	)

virtual

Generate random array of bytes.

Parameters

output	the byte buffer
size	the length of the buffer, in bytes

All generated values are uniformly distributed over the range specified within the the constraints of a particular generator.

Note: A derived generator must override either GenerateBlock() or GenerateIntoBufferedTransformation(). They can override both, or have one call the other.

Reimplemented from RandomNumberGenerator.

Definition at line 67 of file arc4.cpp.

◆ DiscardBytes()

void ARC4_Base::DiscardBytes ( size_t n )

virtual

Generate and discard n bytes.

Parameters

n	the number of bytes to generate and discard

Reimplemented from RandomNumberGenerator.

Definition at line 102 of file arc4.cpp.

◆ ProcessData()

void ARC4_Base::ProcessData	(	byte *	outString,
		const byte *	inString,
		size_t	length
	)

virtual

Encrypt or decrypt an array of bytes.

Parameters

outString	the output byte buffer
inString	the input byte buffer
length	the size of the input and output byte buffers, in bytes

ProcessData is called with a string of bytes whose size depends on MandatoryBlockSize. Either inString == outString, or they must not overlap.

See also: ProcessData, ProcessLastBlock, MandatoryBlockSize, MinLastBlockSize, BlockPaddingSchemeDef, IsLastBlockSpecial

Implements StreamTransformation.

Definition at line 73 of file arc4.cpp.

◆ IsRandomAccess()

bool Weak::ARC4_Base::IsRandomAccess ( ) const

inlinevirtual

Determines whether the cipher supports random access.

Returns: true if the cipher supports random access, false otherwise

Implements StreamTransformation.

Definition at line 34 of file arc4.h.

◆ IsSelfInverting()

bool Weak::ARC4_Base::IsSelfInverting ( ) const

inlinevirtual

Determines whether the cipher is self-inverting.

Returns: true if the cipher is self-inverting, false otherwise

IsSelfInverting determines whether this transformation is self-inverting (e.g. xor with a keystream).

Implements StreamTransformation.

Definition at line 35 of file arc4.h.

◆ IsForwardTransformation()

bool Weak::ARC4_Base::IsForwardTransformation ( ) const

inlinevirtual

Determines if the cipher is being operated in its forward direction.

Returns: true if DIR is ENCRYPTION, false otherwise

See also: IsForwardTransformation(), IsPermutation(), GetCipherDirection()

Implements StreamTransformation.

Definition at line 36 of file arc4.h.

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

Public Types

Public Member Functions

Static Public Member Functions

Additional Inherited Members

Detailed Description

Member Typedef Documentation

◆ Encryption

◆ Decryption

Constructor & Destructor Documentation

◆ ~ARC4_Base()

Member Function Documentation

◆ StaticAlgorithmName()

◆ GenerateBlock()

◆ DiscardBytes()

◆ ProcessData()

◆ IsRandomAccess()

◆ IsSelfInverting()

◆ IsForwardTransformation()