Policy object for additive stream ciphers. More...

#include <strciphr.h>

Inheritance diagram for AdditiveCipherAbstractPolicy:

Public Member Functions
virtual	~AdditiveCipherAbstractPolicy ()

virtual unsigned int	GetAlignment () const
	Provides data alignment requirements. More...

virtual unsigned int	GetBytesPerIteration () const =0
	Provides number of bytes operated upon during an iteration. More...

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

virtual unsigned int	GetIterationsToBuffer () const =0
	Provides buffer size based on iterations. More...

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

virtual bool	CanOperateKeystream () const
	Flag indicating. More...

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

virtual void	CipherSetKey (const NameValuePairs &params, const byte *key, size_t length)=0
	Key the cipher. More...

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

virtual bool	CipherIsRandomAccess () const =0
	Flag indicating random access. More...

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

Detailed Description

Policy object for additive stream ciphers.

Definition at line 106 of file strciphr.h.

Constructor & Destructor Documentation

virtual AdditiveCipherAbstractPolicy::~AdditiveCipherAbstractPolicy ( )

inlinevirtual

Definition at line 108 of file strciphr.h.

Member Function Documentation

virtual bool AdditiveCipherAbstractPolicy::CanOperateKeystream ( ) const

inlinevirtual

Flag indicating.

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

See also: CanOperateKeystream(), OperateKeystream(), WriteKeystream()

Reimplemented in AdditiveCipherConcretePolicy< word32, 20 >, AdditiveCipherConcretePolicy< word32, 8 >, AdditiveCipherConcretePolicy< word32, 256 >, AdditiveCipherConcretePolicy< word32, 16 >, AdditiveCipherConcretePolicy< word32, 1, 64 >, and CTR_ModePolicy.

Definition at line 141 of file strciphr.h.

virtual bool AdditiveCipherAbstractPolicy::CipherIsRandomAccess ( ) const

pure virtual

Flag indicating random access.

Returns: true if the cipher is seekable, false otherwise

See also: SeekToIteration()

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

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

inlinevirtual

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 CTR_ModePolicy, OFB_ModePolicy, PanamaCipherPolicy, XSalsa20_Policy, ChaCha_Policy< R >, SosemanukPolicy, Salsa20_Policy, and SEAL_Policy.

Definition at line 164 of file strciphr.h.

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

pure virtual

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

Implemented in PanamaCipherPolicy, ModePolicyCommonTemplate< AdditiveCipherAbstractPolicy >, XSalsa20_Policy, WAKE_Policy, ChaCha_Policy< R >, SosemanukPolicy, Salsa20_Policy, and SEAL_Policy.

virtual unsigned int AdditiveCipherAbstractPolicy::GetAlignment ( ) const

inlinevirtual

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.

Reimplemented in AdditiveCipherConcretePolicy< word32, 20 >, AdditiveCipherConcretePolicy< word32, 8 >, AdditiveCipherConcretePolicy< word32, 256 >, AdditiveCipherConcretePolicy< word32, 16 >, AdditiveCipherConcretePolicy< word32, 1, 64 >, CTR_ModePolicy, PanamaCipherPolicy, ModePolicyCommonTemplate< AdditiveCipherAbstractPolicy >, and ChaCha_Policy< R >.

Definition at line 114 of file strciphr.h.

virtual unsigned int AdditiveCipherAbstractPolicy::GetBytesPerIteration ( ) const

pure virtual

Provides number of bytes operated upon during an iteration.

Returns: bytes operated upon during an iteration, in bytes

See also: GetOptimalBlockSize()

Implemented in AdditiveCipherConcretePolicy< word32, 20 >, AdditiveCipherConcretePolicy< word32, 8 >, AdditiveCipherConcretePolicy< word32, 256 >, AdditiveCipherConcretePolicy< word32, 16 >, AdditiveCipherConcretePolicy< word32, 1, 64 >, CTR_ModePolicy, and OFB_ModePolicy.

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virtual unsigned int AdditiveCipherAbstractPolicy::GetIterationsToBuffer ( ) const

pure virtual

Provides buffer size based on iterations.

Returns: the buffer size based on iterations, in bytes

Implemented in AdditiveCipherConcretePolicy< word32, 20 >, AdditiveCipherConcretePolicy< word32, 8 >, AdditiveCipherConcretePolicy< word32, 256 >, AdditiveCipherConcretePolicy< word32, 16 >, AdditiveCipherConcretePolicy< word32, 1, 64 >, CTR_ModePolicy, and OFB_ModePolicy.

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virtual unsigned int AdditiveCipherAbstractPolicy::GetOptimalBlockSize ( ) const

inlinevirtual

Provides number of ideal bytes to process.

Returns: the ideal number of bytes to process

Internally, the default implementation returns GetBytesPerIteration()

See also: GetBytesPerIteration()

Reimplemented in ChaCha_Policy< R >.

Definition at line 125 of file strciphr.h.

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

inlinevirtual

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().