Crypto++  8.8
Free C++ class library of cryptographic schemes
Public Member Functions | List of all members
CBC_Decryption Class Reference

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

+ Inheritance diagram for CBC_Decryption:

Public Member Functions

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
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
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
std::string AlgorithmProvider () const
 Retrieve the provider of this algorithm. More...
 
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 keylength) const
 Returns a valid key length for the algorithm. More...
 
bool IsValidKeyLength (size_t keylength) 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)
 Set external block cipher. More...
 
void SetCipherWithIV (BlockCipher &cipher, const byte *iv, int feedbackSize=0)
 Set external block cipher and IV. More...
 
- Public Member Functions inherited from 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
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 size_t ProcessLastBlock (byte *outString, size_t outLength, const byte *inString, size_t inLength)
 Encrypt or decrypt the last block of data. More...
 
virtual bool IsLastBlockSpecial () const
 Determines if the last block receives special processing. 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
 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 ClonableClone () const
 Copies this object. More...
 

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...
 
- Static Public Member Functions inherited from CBC_ModeBase
static const char * StaticAlgorithmName ()
 

Detailed Description

CBC block cipher mode of operation decryption operation.

Definition at line 323 of file modes.h.

Member Function Documentation

◆ ProcessData()

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

ProcessData is called with a string of bytes whose size depends on MandatoryBlockSize. Either inString == outString, or they must not overlap.

See also
ProcessData, ProcessLastBlock, MandatoryBlockSize, MinLastBlockSize, BlockPaddingSchemeDef, IsLastBlockSpecial

Implements StreamTransformation.


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