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CBC_Decryption Class Reference

CBC block cipher mode of operation decryption operation. More...

#include <modes.h>

Inheritance diagram for CBC_Decryption:
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Collaboration diagram for CBC_Decryption:
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Public Member Functions

virtual ~CBC_Decryption ()
 
void ProcessData (byte *outString, const byte *inString, size_t length)
 Encrypt or decrypt an array of bytes. More...
 
- Public Member Functions inherited from CBC_ModeBase
CRYPTOPP_STATIC_CONSTEXPR const char *CRYPTOPP_API StaticAlgorithmName ()
 
IV_Requirement IVRequirement () const
 Minimal requirement for secure IVs. More...
 
bool RequireAlignedInput () const
 
unsigned int MinLastBlockSize () const
 Provides the size of the last block. More...
 
- Public Member Functions inherited from BlockOrientedCipherModeBase
virtual ~BlockOrientedCipherModeBase ()
 
void UncheckedSetKey (const byte *key, unsigned int length, const NameValuePairs &params)
 Sets the key for this object without performing parameter validation. More...
 
unsigned int MandatoryBlockSize () const
 Provides the mandatory block size of the cipher. More...
 
bool IsRandomAccess () const
 Determines whether the cipher supports random access. More...
 
bool IsSelfInverting () const
 Determines whether the cipher is self-inverting. More...
 
bool IsForwardTransformation () const
 Determines if the cipher is being operated in its forward direction. More...
 
void Resynchronize (const byte *iv, int length=-1)
 Resynchronize with an IV. More...
 
- Public Member Functions inherited from CipherModeBase
virtual ~CipherModeBase ()
 
size_t MinKeyLength () const
 Returns smallest valid key length. More...
 
size_t MaxKeyLength () const
 Returns largest valid key length. More...
 
size_t DefaultKeyLength () const
 Returns default key length. More...
 
size_t GetValidKeyLength (size_t n) const
 Returns a valid key length for the algorithm. More...
 
bool IsValidKeyLength (size_t n) const
 Returns whether keylength is a valid key length. More...
 
unsigned int OptimalDataAlignment () const
 Provides input and output data alignment for optimal performance. More...
 
unsigned int IVSize () const
 Returns length of the IV accepted by this object. More...
 
void SetCipher (BlockCipher &cipher)
 
void SetCipherWithIV (BlockCipher &cipher, const byte *iv, int feedbackSize=0)
 
- Public Member Functions inherited from SimpleKeyingInterface
virtual ~SimpleKeyingInterface ()
 
virtual void SetKey (const byte *key, size_t length, const NameValuePairs &params=g_nullNameValuePairs)
 Sets or reset the key of this object. More...
 
void SetKeyWithRounds (const byte *key, size_t length, int rounds)
 Sets or reset the key of this object. More...
 
void SetKeyWithIV (const byte *key, size_t length, const byte *iv, size_t ivLength)
 Sets or reset the key of this object. More...
 
void SetKeyWithIV (const byte *key, size_t length, const byte *iv)
 Sets or reset the key of this object. More...
 
bool IsResynchronizable () const
 Determines if the object can be resynchronized. More...
 
bool CanUseRandomIVs () const
 Determines if the object can use random IVs. More...
 
bool CanUsePredictableIVs () const
 Determines if the object can use random but possibly predictable IVs. More...
 
bool CanUseStructuredIVs () const
 Determines if the object can use structured IVs. More...
 
unsigned int DefaultIVLength () const
 Provides the default size of an IV. More...
 
virtual unsigned int MinIVLength () const
 Provides the minimum size of an IV. More...
 
virtual unsigned int MaxIVLength () const
 Provides the maximum size of an IV. More...
 
virtual void GetNextIV (RandomNumberGenerator &rng, byte *iv)
 Retrieves a secure IV for the next message. More...
 
- Public Member Functions inherited from StreamTransformation
virtual ~StreamTransformation ()
 
StreamTransformationRef ()
 Provides a reference to this object. More...
 
virtual unsigned int OptimalBlockSize () const
 Provides the input block size most efficient for this cipher. More...
 
virtual unsigned int GetOptimalBlockSizeUsed () const
 Provides the number of bytes used in the current block when processing at optimal block size. More...
 
virtual void ProcessLastBlock (byte *outString, const byte *inString, size_t length)
 Encrypt or decrypt the last block of data. More...
 
void ProcessString (byte *inoutString, size_t length)
 Encrypt or decrypt a string of bytes. More...
 
void ProcessString (byte *outString, const byte *inString, size_t length)
 Encrypt or decrypt a string of bytes. More...
 
byte ProcessByte (byte input)
 Encrypt or decrypt a byte. More...
 
virtual void Seek (lword pos)
 Seek to an absolute position. More...
 
- Public Member Functions inherited from Algorithm
virtual ~Algorithm ()
 
 Algorithm (bool checkSelfTestStatus=true)
 Interface for all crypto algorithms. More...
 
virtual std::string AlgorithmName () const
 Provides the name of this algorithm. More...
 
- Public Member Functions inherited from Clonable
virtual ~Clonable ()
 
virtual ClonableClone () const
 Copies this object. More...
 

Protected Member Functions

virtual void ResizeBuffers ()
 
- Protected Member Functions inherited from BlockOrientedCipherModeBase
bool RequireAlignedInput () const
 
- Protected Member Functions inherited from CipherModeBase
 CipherModeBase ()
 
unsigned int BlockSize () const
 
virtual void SetFeedbackSize (unsigned int feedbackSize)
 
- Protected Member Functions inherited from SymmetricCipher
const AlgorithmGetAlgorithm () const
 Returns the base class Algorithm. More...
 
- Protected Member Functions inherited from SimpleKeyingInterface
void ThrowIfInvalidKeyLength (size_t length)
 Validates the key length. More...
 
void ThrowIfResynchronizable ()
 Validates the object. More...
 
void ThrowIfInvalidIV (const byte *iv)
 Validates the IV. More...
 
size_t ThrowIfInvalidIVLength (int length)
 Validates the IV length. More...
 
const byteGetIVAndThrowIfInvalid (const NameValuePairs &params, size_t &size)
 Retrieves and validates the IV. More...
 
void AssertValidKeyLength (size_t length) const
 Validates the key length. More...
 

Protected Attributes

AlignedSecByteBlock m_temp
 
- Protected Attributes inherited from BlockOrientedCipherModeBase
SecByteBlock m_buffer
 
- Protected Attributes inherited from CipherModeBase
BlockCipherm_cipher
 
AlignedSecByteBlock m_register
 

Additional Inherited Members

- Public Types inherited from SimpleKeyingInterface
enum  IV_Requirement {
  UNIQUE_IV = 0, RANDOM_IV, UNPREDICTABLE_RANDOM_IV, INTERNALLY_GENERATED_IV,
  NOT_RESYNCHRONIZABLE
}
 Secure IVs requirements as enumerated values. More...
 

Detailed Description

CBC block cipher mode of operation decryption operation.

Definition at line 261 of file modes.h.

Constructor & Destructor Documentation

virtual CBC_Decryption::~CBC_Decryption ( )
inlinevirtual

Definition at line 264 of file modes.h.

Member Function Documentation

void CBC_Decryption::ProcessData ( byte outString,
const byte inString,
size_t  length 
)
virtual

Encrypt or decrypt an array of bytes.

Parameters
outStringthe output byte buffer
inStringthe input byte buffer
lengththe size of the input and output byte buffers, in bytes

Either inString == outString, or they must not overlap.

Implements StreamTransformation.

Definition at line 221 of file modes.cpp.

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void CBC_Decryption::ResizeBuffers ( )
protectedvirtual

Reimplemented from BlockOrientedCipherModeBase.

Definition at line 215 of file modes.cpp.

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Member Data Documentation

AlignedSecByteBlock CBC_Decryption::m_temp
protected

Definition at line 270 of file modes.h.


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