Crypto++  8.2
Free C++ class library of cryptographic schemes
Public Member Functions | List of all members
CipherModeBase Class Referenceabstract

Block cipher mode of operation information. More...

+ Inheritance diagram for CipherModeBase:

Public Member Functions

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...
 
virtual IV_Requirement IVRequirement () const =0
 Minimal requirement for secure IVs. 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 Resynchronize (const byte *iv, int ivLength=-1)
 Resynchronize with 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 MandatoryBlockSize () const
 Provides the mandatory block size of the cipher. 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 ProcessData (byte *outString, const byte *inString, size_t length)=0
 Encrypt or decrypt an array of bytes. 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 unsigned int MinLastBlockSize () const
 Provides the size of the last block. 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 bool IsRandomAccess () const =0
 Determines whether the cipher supports random access. More...
 
virtual void Seek (lword pos)
 Seek to an absolute position. More...
 
virtual bool IsSelfInverting () const =0
 Determines whether the cipher is self-inverting. More...
 
virtual bool IsForwardTransformation () const =0
 Determines if the cipher is being operated in its forward direction. 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...
 

Detailed Description

Block cipher mode of operation information.

Definition at line 49 of file modes.h.

Member Function Documentation

◆ AlgorithmProvider()

std::string CipherModeBase::AlgorithmProvider ( ) const
inlinevirtual

Retrieve the provider of this algorithm.

Returns
the algorithm provider The algorithm provider can be a name like "C++", "SSE", "NEON", "AESNI", "ARMv8" and "Power8". C++ is standard C++ code. Other labels, like SSE, usually indicate a specialized implementation using instructions from a higher instruction set architecture (ISA). Future labels may include external hardware like a hardware security module (HSM). Generally speaking Wei Dai's original IA-32 ASM code falls under "SSE2". Labels like "SSSE3" and "SSE4.1" follow after Wei's code and use intrinsics instead of ASM. Algorithms which combine different instructions or ISAs provide the dominant one. For example on x86 AES/GCM returns "AESNI" rather than "CLMUL" or "AES+SSE4.1" or "AES+CLMUL" or "AES+SSE4.1+CLMUL".
Note
Provider is not universally implemented yet.
Since
Crypto++ 8.0

Reimplemented from Algorithm.

Reimplemented in XTS_ModeBase.

Definition at line 55 of file modes.h.

◆ MinKeyLength()

size_t CipherModeBase::MinKeyLength ( ) const
inlinevirtual

Returns smallest valid key length.

Returns
the minimum key length, in bytes

Implements SimpleKeyingInterface.

Reimplemented in XTS_ModeBase.

Definition at line 61 of file modes.h.

◆ MaxKeyLength()

size_t CipherModeBase::MaxKeyLength ( ) const
inlinevirtual

Returns largest valid key length.

Returns
the maximum key length, in bytes

Implements SimpleKeyingInterface.

Reimplemented in XTS_ModeBase.

Definition at line 65 of file modes.h.

◆ DefaultKeyLength()

size_t CipherModeBase::DefaultKeyLength ( ) const
inlinevirtual

Returns default key length.

Returns
the default key length, in bytes

Implements SimpleKeyingInterface.

Reimplemented in XTS_ModeBase.

Definition at line 69 of file modes.h.

◆ GetValidKeyLength()

size_t CipherModeBase::GetValidKeyLength ( size_t  keylength) const
inlinevirtual

Returns a valid key length for the algorithm.

Parameters
keylengththe size of the key, in bytes
Returns
the valid key length, in bytes keylength is provided in bytes, not bits. If keylength is less than MIN_KEYLENGTH, then the function returns MIN_KEYLENGTH. If keylength is greater than MAX_KEYLENGTH, then the function returns MAX_KEYLENGTH. if If keylength is a multiple of KEYLENGTH_MULTIPLE, then keylength is returned. Otherwise, the function returns a lower multiple of KEYLENGTH_MULTIPLE.

Implements SimpleKeyingInterface.

Reimplemented in XTS_ModeBase.

Definition at line 79 of file modes.h.

◆ IsValidKeyLength()

bool CipherModeBase::IsValidKeyLength ( size_t  keylength) const
inlinevirtual

Returns whether keylength is a valid key length.

Parameters
keylengththe requested keylength
Returns
true if keylength is valid, false otherwise Internally the function calls GetValidKeyLength()

Reimplemented from SimpleKeyingInterface.

Reimplemented in XTS_ModeBase.

Definition at line 85 of file modes.h.

◆ OptimalDataAlignment()

unsigned int CipherModeBase::OptimalDataAlignment ( ) const
inlinevirtual

Provides input and output data alignment for optimal performance.

Returns
the input data alignment that provides optimal performance
See also
GetAlignment() and OptimalBlockSize()

Reimplemented from StreamTransformation.

Reimplemented in XTS_ModeBase.

Definition at line 90 of file modes.h.

◆ IVSize()

unsigned int CipherModeBase::IVSize ( ) const
inlinevirtual

Returns length of the IV accepted by this object.

Returns
the size of an IV, in bytes
Exceptions
NotImplemented()if the object does not support resynchronization The default implementation throws NotImplemented

Reimplemented from SimpleKeyingInterface.

Definition at line 96 of file modes.h.

◆ IVRequirement()

virtual IV_Requirement CipherModeBase::IVRequirement ( ) const
pure virtual

Minimal requirement for secure IVs.

Returns
the secure IV requirement of the algorithm

Implements SimpleKeyingInterface.

Implemented in XTS_ModeBase, CBC_ModeBase, ECB_OneWay, CTR_ModePolicy, OFB_ModePolicy, and CFB_ModePolicy.

◆ SetCipher()

void CipherModeBase::SetCipher ( BlockCipher cipher)
inline

Set external block cipher.

Parameters
cipherAn external block cipher The cipher should be keyed.

Definition at line 105 of file modes.h.

◆ SetCipherWithIV()

void CipherModeBase::SetCipherWithIV ( BlockCipher cipher,
const byte *  iv,
int  feedbackSize = 0 
)
inline

Set external block cipher and IV.

Parameters
cipherAn external block cipher
iva byte array used to resynchronize the cipher
feedbackSizethe feedback size, in bytes The cipher should be keyed.

Definition at line 117 of file modes.h.


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