CTR_ModePolicy Class Reference

Inheritance diagram for CTR_ModePolicy:

ModePolicyCommonTemplate< AdditiveCipherAbstractPolicy > CipherModeBase AdditiveCipherAbstractPolicy SymmetricCipher StreamTransformation SimpleKeyingInterface Algorithm Clonable List of all members.

Detailed Description

Definition at line 148 of file modes.h.

Public Member Functions

bool IsRandomAccess () const
IV_Requirement IVRequirement () const
 returns the minimal requirement for secure IVs
void GetNextIV (byte *IV)
 get a secure IV for the next message
size_t MinKeyLength () const
 returns smallest valid key length in bytes */
size_t MaxKeyLength () const
 returns largest valid key length in bytes */
size_t DefaultKeyLength () const
 returns default (recommended) key length in bytes */
size_t GetValidKeyLength (size_t n) const
 returns the smallest valid key length in bytes that is >= min(n, GetMaxKeyLength())
bool IsValidKeyLength (size_t n) const
 returns whether n is a valid key length
void SetKey (const byte *key, size_t length, const NameValuePairs &params=g_nullNameValuePairs)
 set or reset the key of this object
unsigned int OptimalDataAlignment () const
 returns how input should be aligned for optimal performance
unsigned int IVSize () const
 returns size of IVs used by this object

Static Public Member Functions

static const char *__cdecl StaticAlgorithmName ()

Protected Member Functions

unsigned int BlockSize () const
virtual void SetFeedbackSize (unsigned int feedbackSize)
virtual void ResizeBuffers ()
virtual void UncheckedSetKey (const NameValuePairs &params, const byte *key, unsigned int length, const byte *iv)=0

Protected Attributes

BlockCipherm_cipher
SecByteBlock m_register


Member Function Documentation

void CTR_ModePolicy::GetNextIV ( byte *  IV  )  [virtual]

get a secure IV for the next message

This method should be called after you finish encrypting one message and are ready to start the next one. After calling it, you must call SetKey() or Resynchronize() before using this object again. This method is not implemented on decryption objects.

Reimplemented from CipherModeBase.

Definition at line 53 of file modes.cpp.

References CipherModeBase::BlockSize().

void CipherModeBase::SetKey ( const byte *  key,
size_t  length,
const NameValuePairs params = g_nullNameValuePairs 
) [virtual, inherited]

set or reset the key of this object

Parameters:
params is used to specify Rounds, BlockSize, etc

Implements SimpleKeyingInterface.

Definition at line 27 of file modes.cpp.

References SimpleKeyingInterface::GetIVAndThrowIfInvalid().


The documentation for this class was generated from the following files:
Generated on Thu Nov 23 15:58:07 2006 for Crypto++ by  doxygen 1.5.1-p1