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

Base class for additive stream ciphers. More...

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

Public Types
typedef WT	WordType
	Word type for the cipher.

Public Member Functions
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...

Static Public Attributes
static const int	BYTES_PER_ITERATION = sizeof(WordType) * W
	Number of bytes for an iteration. More...

Detailed Description

template<typename WT, unsigned int W, unsigned int X = 1, class BASE = AdditiveCipherAbstractPolicy>
struct 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 201 of file strciphr.h.

Member Function Documentation

GetBytesPerIteration()

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 227 of file strciphr.h.

GetIterationsToBuffer()

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 231 of file strciphr.h.

CanOperateKeystream()

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 237 of file strciphr.h.

OperateKeystream()

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()

Member Data Documentation

BYTES_PER_ITERATION

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

const int AdditiveCipherConcretePolicy< WT, W, X, BASE >::BYTES_PER_ITERATION = sizeof(WordType) * W

static

Number of bytes for an iteration.

BYTES_PER_ITERATION is the product sizeof(WordType) * W. For example, ChaCha uses 16 each word32, and the value of BYTES_PER_ITERATION is 64. Each invocation of the ChaCha block function produces 64 bytes of keystream.

Definition at line 211 of file strciphr.h.

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

• strciphr.h