Tiny Encryption Algorithm. More...

#include <cypher.h>

Inheritance diagram for PTEACypher:

Collaboration diagram for PTEACypher:

Classes
struct	Key

Public Member Functions
	PTEACypher (BlockChainMode chainMode=ElectronicCodebook)
	Create a new TEA encryption object instance. More...

	PTEACypher (const Key &keyData, BlockChainMode chainMode=ElectronicCodebook)

void	SetKey (const Key &newKey)
	Set the key used by this encryption method. More...

void	GetKey (Key &newKey) const
	Get the key used by this encryption method. More...

Public Member Functions inherited from PCypher
PString	Encode (const PString &str)
	Encode the data. More...

PString	Encode (const PBYTEArray &clear)
	Encode the data. More...

PString	Encode (const void *data, PINDEX length)
	Encode the data. More...

void	Encode (const PBYTEArray &clear, PBYTEArray &coded)
	Encode the data. More...

void	Encode (const void *data, PINDEX length, PBYTEArray &coded)
	Encode the data. More...

PString	Decode (const PString &cypher)
	Decode the data. More...

PBoolean	Decode (const PString &cypher, PString &clear)
	Decode the data. More...

PBoolean	Decode (const PString &cypher, PBYTEArray &clear)
	Decode the data. More...

PINDEX	Decode (const PString &cypher, void *data, PINDEX length)
	Decode the data. More...

PINDEX	Decode (const PBYTEArray &coded, void *data, PINDEX length)
	Decode the data. More...

PBoolean	Decode (const PBYTEArray &coded, PBYTEArray &clear)
	Decode the data. More...

Public Member Functions inherited from PObject
unsigned	GetTraceContextIdentifier () const
	Get PTRACE context identifier. More...

void	SetTraceContextIdentifier (unsigned id)

void	GetTraceContextIdentifier (PObject &obj)

void	GetTraceContextIdentifier (PObject *obj)

void	SetTraceContextIdentifier (const PObject &obj)

void	SetTraceContextIdentifier (const PObject *obj)

virtual	~PObject ()

virtual PObject *	Clone () const
	Create a copy of the class on the heap. More...

template<class CLS >
CLS *	CloneAs () const
	As for Clone() but converts to specified type. More...

virtual PINDEX	HashFunction () const
	This function yields a hash value required by the `PDictionary` class. More...

virtual const char *	GetClass (unsigned ancestor=0) const
	Get the current dynamic type of the object instance. More...

PBoolean	IsClass (const char *cls) const

virtual PBoolean	InternalIsDescendant (const char *clsName) const
	Determine if the dynamic type of the current instance is a descendent of the specified class. More...

__inline const PObject *	PTraceObjectInstance () const

virtual Comparison	Compare (const PObject &obj) const
	Compare the two objects and return their relative rank. More...

virtual Comparison	CompareObjectMemoryDirect (const PObject &obj) const
	Determine the byte wise comparison of two objects. More...

bool	operator== (const PObject &obj) const
	Compare the two objects. More...

bool	operator!= (const PObject &obj) const
	Compare the two objects. More...

bool	operator< (const PObject &obj) const
	Compare the two objects. More...

bool	operator> (const PObject &obj) const
	Compare the two objects. More...

bool	operator<= (const PObject &obj) const
	Compare the two objects. More...

bool	operator>= (const PObject &obj) const
	Compare the two objects. More...

virtual void	PrintOn (ostream &strm) const
	Output the contents of the object to the stream. More...

virtual void	ReadFrom (istream &strm)
	Input the contents of the object from the stream. More...

Static Public Member Functions
static void	GenerateKey (Key &newKey)
	Generate a new key suitable for use for encryption using random data. More...

Protected Member Functions
virtual void	Initialise (PBoolean encoding)
	Initialise the encoding/decoding sequence. More...

virtual void	EncodeBlock (const void in, void out)
	Encode an n bit block of memory according to the encryption algorithm. More...

virtual void	DecodeBlock (const void in, void out)
	Decode an n bit block of memory according to the encryption algorithm. More...

Protected Member Functions inherited from PCypher
	PCypher (PINDEX blockSize, BlockChainMode chainMode)
	Create a new encryption object instance. More...

	PCypher (const void *keyData, PINDEX keyLength, PINDEX blockSize, BlockChainMode chainMode)

Protected Member Functions inherited from PObject
	PObject ()
	Constructor for PObject, made protected so cannot ever create one on its own. More...

Additional Inherited Members
Public Types inherited from PCypher
enum	BlockChainMode { ElectronicCodebook, ECB = ElectronicCodebook, CypherBlockChaining, CBC = CypherBlockChaining, OutputFeedback, OFB = OutputFeedback, CypherFeedback, CFB = CypherFeedback, NumBlockChainModes }
	Mechanism by which sequential blocks are linked. More...

Protected Attributes inherited from PCypher
PBYTEArray	key
	Key for the encryption/decryption. More...

PINDEX	blockSize
	Size of each encryption block in bytes. More...

BlockChainMode	chainMode
	Mode for sequential encryption each block. More...

Friends inherited from PObject

Detailed Description

Tiny Encryption Algorithm.

This class implements the Tiny Encryption Algorithm by David Wheeler and Roger Needham at Cambridge University.

This is a simple algorithm using a 128 bit binary key and encrypts data in 64 bit blocks.

Constructor & Destructor Documentation

PTEACypher::PTEACypher ( BlockChainMode chainMode = ElectronicCodebook )

Create a new TEA encryption object instance.

The parameterless version automatically generates a new, random, key.

Parameters

chainMode Block chain mode

PTEACypher::PTEACypher	(	const Key &	keyData,
		BlockChainMode	chainMode = `ElectronicCodebook`
	)

Parameters

keyData	Key for the encryption/decryption algorithm.
chainMode	Block chain mode

Member Function Documentation

virtual void PTEACypher::DecodeBlock	(	const void *	in,
		void *	out
	)

protectedvirtual

Decode an n bit block of memory according to the encryption algorithm.

Parameters

in	Pointer to coded n bit block.
out	Pointer to clear n bit block.

Implements PCypher.

virtual void PTEACypher::EncodeBlock	(	const void *	in,
		void *	out
	)

protectedvirtual

Encode an n bit block of memory according to the encryption algorithm.

Parameters

in	Pointer to clear n bit block.
out	Pointer to coded n bit block.

Implements PCypher.

static void PTEACypher::GenerateKey ( Key & newKey )

static

Generate a new key suitable for use for encryption using random data.

Parameters

newKey Variable to take the newly generated key.

void PTEACypher::GetKey ( Key & newKey ) const

Get the key used by this encryption method.

Parameters

newKey Variable to take the key used by cypher.

virtual void PTEACypher::Initialise ( PBoolean encoding )

protectedvirtual

Initialise the encoding/decoding sequence.

Parameters

encoding Flag for encoding/decoding sequence about to start.

Implements PCypher.

void PTEACypher::SetKey ( const Key & newKey )

Set the key used by this encryption method.

Parameters

newKey Variable to take the key used by cypher.

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

cypher.h

Classes

Public Member Functions

Static Public Member Functions

Protected Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

Member Function Documentation