Salsa20 stream cipher operation. More...

#include <salsa.h>

Inheritance diagram for Salsa20_Policy:

Collaboration diagram for Salsa20_Policy:

Protected Member Functions
void	CipherSetKey (const NameValuePairs &params, const byte *key, size_t length)
	Key the cipher. More...

void	OperateKeystream (KeystreamOperation operation, byte output, const byte input, size_t iterationCount)
	Operates the keystream. More...

void	CipherResynchronize (byte keystreamBuffer, const byte IV, size_t length)
	Resynchronize the cipher. More...

bool	CipherIsRandomAccess () const
	Flag indicating random access. More...

void	SeekToIteration (lword iterationCount)
	Seeks to a random position in the stream. More...

Protected Attributes
FixedSizeAlignedSecBlock< word32, 16 >	m_state

int	m_rounds

Additional Inherited Members
Public Types inherited from AdditiveCipherConcretePolicy< word32, 16 >
typedef word32	WordType

Public Member Functions inherited from AdditiveCipherConcretePolicy< word32, 16 >
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...

Public Member Functions inherited from AdditiveCipherAbstractPolicy
virtual	~AdditiveCipherAbstractPolicy ()

virtual unsigned int	GetOptimalBlockSize () const
	Provides number of ideal bytes to process. More...

virtual void	WriteKeystream (byte *keystream, size_t iterationCount)
	Generate the keystream. More...

Detailed Description

Salsa20 stream cipher operation.

Definition at line 30 of file salsa.h.

Member Function Documentation

bool Salsa20_Policy::CipherIsRandomAccess ( ) const

inlineprotectedvirtual

Flag indicating random access.

Definition at line 36 of file salsa.h.

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void Salsa20_Policy::CipherResynchronize	(	byte *	keystreamBuffer,
		const byte *	iv,
		size_t	length
	)

protectedvirtual

Resynchronize the cipher.

Parameters

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

Reimplemented in XSalsa20_Policy.

Definition at line 63 of file salsa.cpp.

void Salsa20_Policy::CipherSetKey	(	const NameValuePairs &	params,
		const byte *	key,
		size_t	length
	)

protectedvirtual

Key the cipher.

Parameters

params	set of NameValuePairs use to initialize this object
key	a byte array used to key the cipher
length	the size of the key array

Reimplemented in XSalsa20_Policy.

Definition at line 43 of file salsa.cpp.

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void Salsa20_Policy::OperateKeystream	(	KeystreamOperation	operation,
		byte *	output,
		const byte *	input,
		size_t	iterationCount
	)

protectedvirtual

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().