AdditiveCipherConcretePolicy< WT, W, X, BASE > Class Template Reference

Base class for additive stream ciphers. More...

#include <strciphr.h>

Inheritance diagram for AdditiveCipherConcretePolicy< WT, W, X, BASE >:

Collaboration diagram for AdditiveCipherConcretePolicy< WT, W, X, BASE >:

Public Types
typedef WT	WordType

Public Member Functions
unsigned int	GetAlignment () const
	Provides data alignment requirements. More...
unsigned int	GetBytesPerIteration () const
	Provides number of bytes operated upon during an iteration. More...
unsigned int	GetIterationsToBuffer () const
	Provides buffer size based on iterations. More...
bool	CanOperateKeystream () const
	Flag indicating. More...
virtual void	OperateKeystream (KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount)=0
	Operates the keystream. More...

Detailed Description

template<typename WT, unsigned int W, unsigned int X = 1, class BASE = AdditiveCipherAbstractPolicy>
class AdditiveCipherConcretePolicy< WT, W, X, BASE >

Base class for additive stream ciphers.

Template Parameters

WT	word type
W	count of words
X	bytes per iteration count
BASE	AdditiveCipherAbstractPolicy derived base class

Definition at line 186 of file strciphr.h.

Member Typedef Documentation

template<typename WT, unsigned int W, unsigned int X = 1, class BASE = AdditiveCipherAbstractPolicy>

typedef WT AdditiveCipherConcretePolicy< WT, W, X, BASE >::WordType

Definition at line 188 of file strciphr.h.

Member Function Documentation

template<typename WT, unsigned int W, unsigned int X = 1, class BASE = AdditiveCipherAbstractPolicy>

bool AdditiveCipherConcretePolicy< WT, W, X, BASE >::CanOperateKeystream ( ) const

inline

Flag indicating.

Returns

true if the stream can be generated independent of the transformation input, false otherwise

See also

CanOperateKeystream(), OperateKeystream(), WriteKeystream()

Definition at line 211 of file strciphr.h.

template<typename WT, unsigned int W, unsigned int X = 1, class BASE = AdditiveCipherAbstractPolicy>

unsigned int AdditiveCipherConcretePolicy< WT, W, X, BASE >::GetAlignment ( ) const

inline

Provides data alignment requirements.

Returns

data alignment requirements, in bytes

Internally, the default implementation returns 1. If the stream cipher is implemented using an SSE2 ASM or intrinsics, then the value returned is usually 16.

Definition at line 196 of file strciphr.h.

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template<typename WT, unsigned int W, unsigned int X = 1, class BASE = AdditiveCipherAbstractPolicy>

unsigned int AdditiveCipherConcretePolicy< WT, W, X, BASE >::GetBytesPerIteration ( ) const

inline

Provides number of bytes operated upon during an iteration.

Returns

bytes operated upon during an iteration, in bytes

See also

GetOptimalBlockSize()

Definition at line 202 of file strciphr.h.

template<typename WT, unsigned int W, unsigned int X = 1, class BASE = AdditiveCipherAbstractPolicy>

unsigned int AdditiveCipherConcretePolicy< WT, W, X, BASE >::GetIterationsToBuffer ( ) const

inline

Provides buffer size based on iterations.

Returns

the buffer size based on iterations, in bytes

Definition at line 206 of file strciphr.h.

template<typename WT, unsigned int W, unsigned int X = 1, class BASE = AdditiveCipherAbstractPolicy>

virtual void AdditiveCipherConcretePolicy< WT, W, X, BASE >::OperateKeystream ( KeystreamOperation  operation, byte *  output, const byte *  input, size_t  iterationCount  )

pure virtual

Operates the keystream.

Parameters

operation	the operation with additional flags
output	the output buffer
input	the input buffer
iterationCount	the number of iterations to perform on the input

OperateKeystream() will attempt to operate upon GetOptimalBlockSize() buffer, which will be derived from GetBytesPerIteration().

See also

CanOperateKeystream(), OperateKeystream(), WriteKeystream(), KeystreamOperation()

Implemented in PanamaCipherPolicy< B >, WAKE_Policy< B >, ChaCha_Policy< R >, SosemanukPolicy, Salsa20_Policy, and SEAL_Policy< B >.

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

• src/cryptopp/strciphr.h