DataDecryptorWithMAC< BC, H, MAC, Info > Class Template Reference

Password-based decryptor with MAC. More...

#include <default.h>

Inheritance diagram for DataDecryptorWithMAC< BC, H, MAC, Info >:

Public Member Functions
	CRYPTOPP_CONSTANT (BLOCKSIZE=Info::BLOCKSIZE)
	CRYPTOPP_CONSTANT (KEYLENGTH=Info::KEYLENGTH)
	CRYPTOPP_CONSTANT (SALTLENGTH=Info::SALTLENGTH)
	CRYPTOPP_CONSTANT (DIGESTSIZE=Info::DIGESTSIZE)
	CRYPTOPP_CONSTANT (ITERATIONS=Info::ITERATIONS)
	DataDecryptorWithMAC (const char *passphrase, BufferedTransformation *attachment=NULLPTR, bool throwException=true)
	Constructs a DataDecryptor.
	DataDecryptorWithMAC (const byte *passphrase, size_t passphraseLength, BufferedTransformation *attachment=NULLPTR, bool throwException=true)
	Constructs a DataDecryptor.
DataDecryptor< BC, H, Info >::State	CurrentState () const
bool	CheckLastMAC () const
Public Member Functions inherited from ProxyFilter
	ProxyFilter (BufferedTransformation *filter, size_t firstSize, size_t lastSize, BufferedTransformation *attachment)
	Construct a ProxyFilter.
bool	IsolatedFlush (bool hardFlush, bool blocking)
	Flushes data buffered by this object, without signal propagation.
void	SetFilter (Filter *filter)
	Sets the OutputProxy filter.
void	NextPutMultiple (const byte *s, size_t len)
void	NextPutModifiable (byte *inString, size_t length)
Public Member Functions inherited from FilterWithBufferedInput
	FilterWithBufferedInput (BufferedTransformation *attachment)
	Construct a FilterWithBufferedInput with an attached transformation.
	FilterWithBufferedInput (size_t firstSize, size_t blockSize, size_t lastSize, BufferedTransformation *attachment)
	Construct a FilterWithBufferedInput with an attached transformation.
void	IsolatedInitialize (const NameValuePairs &parameters)
	Initialize or reinitialize this object, without signal propagation.
size_t	Put2 (const byte *inString, size_t length, int messageEnd, bool blocking)
	Input multiple bytes for processing.
size_t	PutModifiable2 (byte *inString, size_t length, int messageEnd, bool blocking)
	Input multiple bytes that may be modified by callee.
void	ForceNextPut ()
	Flushes data buffered by this object.
Public Member Functions inherited from Filter
	Filter (BufferedTransformation *attachment=NULLPTR)
	Construct a Filter.
bool	Attachable ()
	Determine if attachable.
BufferedTransformation *	AttachedTransformation ()
	Retrieve attached transformation.
const BufferedTransformation *	AttachedTransformation () const
	Retrieve attached transformation.
void	Detach (BufferedTransformation *newAttachment=NULLPTR)
	Replace an attached transformation.
size_t	TransferTo2 (BufferedTransformation &target, lword &transferBytes, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true)
	Transfer bytes from this object to another BufferedTransformation.
size_t	CopyRangeTo2 (BufferedTransformation &target, lword &begin, lword end=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true) const
	Copy bytes from this object to another BufferedTransformation.
void	Initialize (const NameValuePairs &parameters=g_nullNameValuePairs, int propagation=-1)
	Initialize or reinitialize this object, with signal propagation.
bool	Flush (bool hardFlush, int propagation=-1, bool blocking=true)
	Flush buffered input and/or output, with signal propagation.
bool	MessageSeriesEnd (int propagation=-1, bool blocking=true)
	Marks the end of a series of messages, with signal propagation.
Public Member Functions inherited from BufferedTransformation
	BufferedTransformation ()
	Construct a BufferedTransformation.
BufferedTransformation &	Ref ()
	Provides a reference to this object.
virtual void	Attach (BufferedTransformation *newAttachment)
	Add newAttachment to the end of attachment chain.
size_t	Put (byte inByte, bool blocking=true)
	Input a byte for processing.
size_t	Put (const byte *inString, size_t length, bool blocking=true)
	Input a byte buffer for processing.
size_t	PutWord16 (word16 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true)
size_t	PutWord32 (word32 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true)
size_t	PutWord64 (word64 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true)
virtual byte *	CreatePutSpace (size_t &size)
	Request space which can be written into by the caller.
virtual bool	CanModifyInput () const
	Determines whether input can be modified by the callee.
size_t	PutModifiable (byte *inString, size_t length, bool blocking=true)
	Input multiple bytes that may be modified by callee.
bool	MessageEnd (int propagation=-1, bool blocking=true)
	Signals the end of messages to the object.
size_t	PutMessageEnd (const byte *inString, size_t length, int propagation=-1, bool blocking=true)
	Input multiple bytes for processing and signal the end of a message.
unsigned int	GetMaxWaitObjectCount () const
	Retrieves the maximum number of waitable objects.
void	GetWaitObjects (WaitObjectContainer &container, CallStack const &callStack)
	Retrieves waitable objects.
virtual bool	IsolatedMessageSeriesEnd (bool blocking)
	Marks the end of a series of messages, without signal propagation.
virtual void	SetAutoSignalPropagation (int propagation)
	Set propagation of automatically generated and transferred signals.
virtual int	GetAutoSignalPropagation () const
	Retrieve automatic signal propagation value.
virtual lword	MaxRetrievable () const
	Provides the number of bytes ready for retrieval.
virtual bool	AnyRetrievable () const
	Determines whether bytes are ready for retrieval.
virtual size_t	Get (byte &outByte)
	Retrieve a 8-bit byte.
virtual size_t	Get (byte *outString, size_t getMax)
	Retrieve a block of bytes.
virtual size_t	Peek (byte &outByte) const
	Peek a 8-bit byte.
virtual size_t	Peek (byte *outString, size_t peekMax) const
	Peek a block of bytes.
size_t	GetWord16 (word16 &value, ByteOrder order=BIG_ENDIAN_ORDER)
	Retrieve a 16-bit word.
size_t	GetWord32 (word32 &value, ByteOrder order=BIG_ENDIAN_ORDER)
	Retrieve a 32-bit word.
size_t	GetWord64 (word64 &value, ByteOrder order=BIG_ENDIAN_ORDER)
	Retrieve a 64-bit word.
size_t	PeekWord16 (word16 &value, ByteOrder order=BIG_ENDIAN_ORDER) const
	Peek a 16-bit word.
size_t	PeekWord32 (word32 &value, ByteOrder order=BIG_ENDIAN_ORDER) const
	Peek a 32-bit word.
size_t	PeekWord64 (word64 &value, ByteOrder order=BIG_ENDIAN_ORDER) const
	Peek a 64-bit word.
lword	TransferTo (BufferedTransformation &target, lword transferMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL)
	move transferMax bytes of the buffered output to target as input
virtual lword	Skip (lword skipMax=LWORD_MAX)
	Discard skipMax bytes from the output buffer.
lword	CopyTo (BufferedTransformation &target, lword copyMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL) const
	Copy bytes from this object to another BufferedTransformation.
lword	CopyRangeTo (BufferedTransformation &target, lword position, lword copyMax=LWORD_MAX, const std::string &channel=DEFAULT_CHANNEL) const
	Copy bytes from this object using an index to another BufferedTransformation.
virtual lword	TotalBytesRetrievable () const
	Provides the number of bytes ready for retrieval.
virtual unsigned int	NumberOfMessages () const
	Provides the number of meesages processed by this object.
virtual bool	AnyMessages () const
	Determines if any messages are available for retrieval.
virtual bool	GetNextMessage ()
	Start retrieving the next message.
virtual unsigned int	SkipMessages (unsigned int count=UINT_MAX)
	Skip a number of meessages.
unsigned int	TransferMessagesTo (BufferedTransformation &target, unsigned int count=UINT_MAX, const std::string &channel=DEFAULT_CHANNEL)
	Transfer messages from this object to another BufferedTransformation.
unsigned int	CopyMessagesTo (BufferedTransformation &target, unsigned int count=UINT_MAX, const std::string &channel=DEFAULT_CHANNEL) const
	Copy messages from this object to another BufferedTransformation.
virtual void	SkipAll ()
	Skip all messages in the series.
void	TransferAllTo (BufferedTransformation &target, const std::string &channel=DEFAULT_CHANNEL)
	Transfer all bytes from this object to another BufferedTransformation.
void	CopyAllTo (BufferedTransformation &target, const std::string &channel=DEFAULT_CHANNEL) const
	Copy messages from this object to another BufferedTransformation.
virtual bool	GetNextMessageSeries ()
	Retrieve the next message in a series.
virtual unsigned int	NumberOfMessagesInThisSeries () const
	Provides the number of messages in a series.
virtual unsigned int	NumberOfMessageSeries () const
	Provides the number of messages in a series.
size_t	TransferMessagesTo2 (BufferedTransformation &target, unsigned int &messageCount, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true)
	Transfer messages from this object to another BufferedTransformation.
size_t	TransferAllTo2 (BufferedTransformation &target, const std::string &channel=DEFAULT_CHANNEL, bool blocking=true)
	Transfer all bytes from this object to another BufferedTransformation.
size_t	ChannelPut (const std::string &channel, byte inByte, bool blocking=true)
	Input a byte for processing on a channel.
size_t	ChannelPut (const std::string &channel, const byte *inString, size_t length, bool blocking=true)
	Input a byte buffer for processing on a channel.
size_t	ChannelPutModifiable (const std::string &channel, byte *inString, size_t length, bool blocking=true)
	Input multiple bytes that may be modified by callee on a channel.
size_t	ChannelPutWord16 (const std::string &channel, word16 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true)
	Input a 16-bit word for processing on a channel.
size_t	ChannelPutWord32 (const std::string &channel, word32 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true)
	Input a 32-bit word for processing on a channel.
size_t	ChannelPutWord64 (const std::string &channel, word64 value, ByteOrder order=BIG_ENDIAN_ORDER, bool blocking=true)
	Input a 64-bit word for processing on a channel.
bool	ChannelMessageEnd (const std::string &channel, int propagation=-1, bool blocking=true)
	Signal the end of a message.
size_t	ChannelPutMessageEnd (const std::string &channel, const byte *inString, size_t length, int propagation=-1, bool blocking=true)
	Input multiple bytes for processing and signal the end of a message.
virtual byte *	ChannelCreatePutSpace (const std::string &channel, size_t &size)
	Request space which can be written into by the caller.
virtual size_t	ChannelPut2 (const std::string &channel, const byte *inString, size_t length, int messageEnd, bool blocking)
	Input multiple bytes for processing on a channel.
virtual size_t	ChannelPutModifiable2 (const std::string &channel, byte *inString, size_t length, int messageEnd, bool blocking)
	Input multiple bytes that may be modified by callee on a channel.
virtual bool	ChannelFlush (const std::string &channel, bool hardFlush, int propagation=-1, bool blocking=true)
	Flush buffered input and/or output on a channel.
virtual bool	ChannelMessageSeriesEnd (const std::string &channel, int propagation=-1, bool blocking=true)
	Marks the end of a series of messages on a channel.
virtual void	SetRetrievalChannel (const std::string &channel)
	Sets the default retrieval channel.
Public Member Functions inherited from Algorithm
	Algorithm (bool checkSelfTestStatus=true)
	Interface for all crypto algorithms.
virtual std::string	AlgorithmName () const
	Provides the name of this algorithm.
virtual std::string	AlgorithmProvider () const
	Retrieve the provider of this algorithm.
Public Member Functions inherited from Clonable
virtual Clonable *	Clone () const
	Copies this object.
Public Member Functions inherited from Waitable
bool	Wait (unsigned long milliseconds, CallStack const &callStack)
	Wait on this object.

Protected Member Functions
void	FirstPut (const byte *inString)
void	LastPut (const byte *inString, size_t length)
	Input the last block of data.
Protected Member Functions inherited from FilterWithBufferedInput
virtual bool	DidFirstPut () const
virtual size_t	GetFirstPutSize () const
virtual size_t	GetBlockPutSize () const
virtual size_t	GetLastPutSize () const
virtual void	InitializeDerivedAndReturnNewSizes (const NameValuePairs &parameters, size_t &firstSize, size_t &blockSize, size_t &lastSize)
virtual void	InitializeDerived (const NameValuePairs &parameters)
virtual void	NextPutSingle (const byte *inString)
virtual void	FlushDerived ()
size_t	PutMaybeModifiable (byte *begin, size_t length, int messageEnd, bool blocking, bool modifiable)
void	NextPutMaybeModifiable (byte *inString, size_t length, bool modifiable)
virtual int	NextPut (const byte *inString, size_t length)
Protected Member Functions inherited from Filter
virtual BufferedTransformation *	NewDefaultAttachment () const
void	Insert (Filter *nextFilter)
virtual bool	ShouldPropagateMessageEnd () const
virtual bool	ShouldPropagateMessageSeriesEnd () const
void	PropagateInitialize (const NameValuePairs &parameters, int propagation)
size_t	Output (int outputSite, const byte *inString, size_t length, int messageEnd, bool blocking, const std::string &channel=DEFAULT_CHANNEL)
	Forward processed data on to attached transformation.
size_t	OutputModifiable (int outputSite, byte *inString, size_t length, int messageEnd, bool blocking, const std::string &channel=DEFAULT_CHANNEL)
	Output multiple bytes that may be modified by callee.
bool	OutputMessageEnd (int outputSite, int propagation, bool blocking, const std::string &channel=DEFAULT_CHANNEL)
	Signals the end of messages to the object.
bool	OutputFlush (int outputSite, bool hardFlush, int propagation, bool blocking, const std::string &channel=DEFAULT_CHANNEL)
	Flush buffered input and/or output, with signal propagation.
bool	OutputMessageSeriesEnd (int outputSite, int propagation, bool blocking, const std::string &channel=DEFAULT_CHANNEL)
	Marks the end of a series of messages, with signal propagation.

Additional Inherited Members
Static Protected Member Functions inherited from BufferedTransformation
static int	DecrementPropagation (int propagation)
	Decrements the propagation count while clamping at 0.
Protected Attributes inherited from ProxyFilter
member_ptr< BufferedTransformation >	m_filter
Protected Attributes inherited from FilterWithBufferedInput
size_t	m_firstSize
size_t	m_blockSize
size_t	m_lastSize
bool	m_firstInputDone
BlockQueue	m_queue
Protected Attributes inherited from Filter
size_t	m_inputPosition
int	m_continueAt

Detailed Description

template<class BC, class H, class MAC, class Info>
class DataDecryptorWithMAC< BC, H, MAC, Info >

Password-based decryptor with MAC.

Template Parameters

BC	BlockCipher based class used for encryption
H	HashTransformation based class used for mashing
MAC	HashTransformation based class used for authentication
Info	Constants used by the algorithms

DataDecryptorWithMAC uses a non-standard mashup function called Mash() to derive key bits from the password.

The purpose of the function Mash() is to take an arbitrary length input string and deterministically produce an arbitrary length output string such that (1) it looks random, (2) no information about the input is deducible from it, and (3) it contains as much entropy as it can hold, or the amount of entropy in the input string, whichever is smaller.

Crypto++ 5.6.5 and earlier used the legacy algorithms, including DES_EDE2 and SHA1. Crypto++ 5.7 switched to AES and SHA256.

See also

DefaultEncryptorWithMAC, DefaultDecryptorWithMAC, LegacyDecryptorWithMAC, LegacyEncryptorWithMAC

Since

Crypto++ 2.0

Definition at line 218 of file default.h.

Constructor & Destructor Documentation

DataDecryptorWithMAC() [1/2]

template<class BC , class H , class MAC , class Info >

DataDecryptorWithMAC< BC, H, MAC, Info >::DataDecryptorWithMAC	(	const char *	passphrase,
		BufferedTransformation *	attachment = NULLPTR,
		bool	throwException = true
	)

Constructs a DataDecryptor.

Parameters

passphrase	a C-String password
attachment	a BufferedTransformation to attach to this object
throwException	a flag specifying whether an Exception should be thrown on error

Definition at line 257 of file default.cpp.

DataDecryptorWithMAC() [2/2]

template<class BC , class H , class MAC , class Info >

DataDecryptorWithMAC< BC, H, MAC, Info >::DataDecryptorWithMAC	(	const byte *	passphrase,
		size_t	passphraseLength,
		BufferedTransformation *	attachment = NULLPTR,
		bool	throwException = true
	)

Constructs a DataDecryptor.

Parameters

passphrase	a byte string password
passphraseLength	the length of the byte string password
attachment	a BufferedTransformation to attach to this object
throwException	a flag specifying whether an Exception should be thrown on error

Definition at line 266 of file default.cpp.

Member Function Documentation

CheckLastMAC()

template<class BC , class H , class MAC , class Info >

bool DataDecryptorWithMAC< BC, H, MAC, Info >::CheckLastMAC

(

)

const

Definition at line 281 of file default.cpp.

CurrentState()

template<class BC , class H , class MAC , class Info >

DataDecryptor< BC, H, Info >::State DataDecryptorWithMAC< BC, H, MAC, Info >::CurrentState

(

)

const

Definition at line 275 of file default.cpp.

FirstPut()

template<class BC , class H , class MAC , class Info >

void DataDecryptorWithMAC< BC, H, MAC, Info >::FirstPut ( const byte *  inString )

inlineprotectedvirtual

Implements FilterWithBufferedInput.

Definition at line 244 of file default.h.

LastPut()

template<class BC , class H , class MAC , class Info >

void DataDecryptorWithMAC< BC, H, MAC, Info >::LastPut ( const byte *  inString, size_t  length  )

protectedvirtual

Input the last block of data.

Parameters

inString	the input byte buffer
length	the size of the input buffer, in bytes

LastPut() processes the last block of data and signals attached filters to do the same. LastPut() is always called. The pseudo algorithm for the logic is:

    if totalLength < firstSize then length == totalLength
    else if totalLength <= firstSize+lastSize then length == totalLength-firstSize
    else lastSize <= length < lastSize+blockSize

Implements FilterWithBufferedInput.

Definition at line 287 of file default.cpp.

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

• G:/work/subversion/scol-technologies/trunk/scol/plugins/security/cryptopp/default.h
• G:/work/subversion/scol-technologies/trunk/scol/plugins/security/cryptopp/default.cpp