Inheritance diagram for OFB_ModePolicy:
Definition at line 125 of file modes.h.
Public Types | |
enum | IV_Requirement { STRUCTURED_IV = 0, RANDOM_IV, UNPREDICTABLE_RANDOM_IV, INTERNALLY_GENERATED_IV, NOT_RESYNCHRONIZABLE } |
Public Member Functions | |
bool | IsRandomAccess () const |
IV_Requirement | IVRequirement () const |
returns the minimal requirement for secure IVs | |
unsigned int | MinKeyLength () const |
returns smallest valid key length in bytes */ | |
unsigned int | MaxKeyLength () const |
returns largest valid key length in bytes */ | |
unsigned int | DefaultKeyLength () const |
returns default (recommended) key length in bytes */ | |
unsigned int | GetValidKeyLength (unsigned int n) const |
returns the smallest valid key length in bytes that is >= min(n, GetMaxKeyLength()) | |
bool | IsValidKeyLength (unsigned int n) const |
returns whether n is a valid key length | |
void | SetKey (const byte *key, unsigned int length, const NameValuePairs ¶ms=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 | |
void | GetNextIV (byte *IV) |
get a secure IV for the next message | |
StreamTransformation & | Ref () |
return a reference to this object, | |
virtual unsigned int | MandatoryBlockSize () const |
returns block size, if input must be processed in blocks, otherwise 1 | |
virtual unsigned int | OptimalBlockSize () const |
returns the input block size that is most efficient for this cipher | |
virtual unsigned int | GetOptimalBlockSizeUsed () const |
returns how much of the current block is used up | |
virtual void | ProcessData (byte *outString, const byte *inString, unsigned int length)=0 |
encrypt or decrypt an array of bytes of specified length | |
virtual void | ProcessLastBlock (byte *outString, const byte *inString, unsigned int length) |
for ciphers where the last block of data is special, encrypt or decrypt the last block of data | |
virtual unsigned int | MinLastBlockSize () const |
returns the minimum size of the last block, 0 indicating the last block is not special | |
void | ProcessString (byte *inoutString, unsigned int length) |
same as ProcessData(inoutString, inoutString, length) | |
void | ProcessString (byte *outString, const byte *inString, unsigned int length) |
same as ProcessData(outString, inString, length) | |
byte | ProcessByte (byte input) |
implemented as {ProcessData(&input, &input, 1); return input;} | |
virtual void | Seek (lword n) |
for random access ciphers, seek to an absolute position | |
virtual bool | IsSelfInverting () const =0 |
returns whether this transformation is self-inverting (e.g. xor with a keystream) | |
virtual bool | IsForwardTransformation () const =0 |
returns whether this is an encryption object | |
virtual std::string | AlgorithmName () const |
returns name of this algorithm, not universally implemented yet | |
virtual Clonable * | Clone () const |
this is not implemented by most classes yet | |
void | SetKeyWithRounds (const byte *key, unsigned int length, int rounds) |
calls SetKey() with an NameValuePairs object that just specifies "Rounds" | |
void | SetKeyWithIV (const byte *key, unsigned int length, const byte *iv) |
calls SetKey() with an NameValuePairs object that just specifies "IV" | |
bool | IsResynchronizable () const |
returns whether this object can be resynchronized (i.e. supports initialization vectors) | |
bool | CanUseRandomIVs () const |
returns whether this object can use random IVs (in addition to ones returned by GetNextIV) | |
bool | CanUsePredictableIVs () const |
returns whether this object can use random but possibly predictable IVs (in addition to ones returned by GetNextIV) | |
bool | CanUseStructuredIVs () const |
returns whether this object can use structured IVs, for example a counter (in addition to ones returned by GetNextIV) | |
virtual void | Resynchronize (const byte *IV) |
resynchronize with an IV | |
virtual bool | CanOperateKeystream () const |
virtual void | OperateKeystream (KeystreamOperation operation, byte *output, const byte *input, unsigned int iterationCount) |
virtual void | SeekToIteration (lword iterationCount) |
Static Public Member Functions | |
static const char * | StaticAlgorithmName () |
Protected Member Functions | |
unsigned int | BlockSize () const |
virtual void | SetFeedbackSize (unsigned int feedbackSize) |
virtual void | ResizeBuffers () |
virtual void | UncheckedSetKey (const NameValuePairs ¶ms, const byte *key, unsigned int length, const byte *iv)=0 |
void | ThrowIfInvalidKeyLength (const Algorithm &algorithm, unsigned int length) |
void | ThrowIfResynchronizable () |
void | ThrowIfInvalidIV (const byte *iv) |
const byte * | GetIVAndThrowIfInvalid (const NameValuePairs ¶ms) |
void | AssertValidKeyLength (unsigned int length) const |
Protected Attributes | |
BlockCipher * | m_cipher |
SecByteBlock | m_register |
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set or reset the key of this object
Implements SimpleKeyingInterface. Definition at line 27 of file modes.cpp. References SimpleKeyingInterface::GetIVAndThrowIfInvalid(). |
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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 SimpleKeyingInterface. Reimplemented in CTR_ModePolicy. Definition at line 32 of file modes.cpp. References CipherModeBase::BlockSize(), StreamTransformation::IsForwardTransformation(), CipherModeBase::m_cipher, CipherModeBase::m_register, and BlockTransformation::ProcessBlock(). |
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return a reference to this object, This function is useful for passing a temporary StreamTransformation object to a function that takes a non-const reference. Definition at line 464 of file cryptlib.h. |
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returns the input block size that is most efficient for this cipher
Reimplemented in ECB_OneWay. Definition at line 471 of file cryptlib.h. Referenced by StreamTransformationFilter::FirstPut(). |
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encrypt or decrypt an array of bytes of specified length
Implemented in ARC4_Base, PublicBlumBlumShub, and BlockOrientedCipherModeBase. Referenced by StreamTransformationFilter::LastPut(), and StreamTransformation::ProcessLastBlock(). |
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for ciphers where the last block of data is special, encrypt or decrypt the last block of data For now the only use of this function is for CBC-CTS mode. Reimplemented in CBC_CTS_Encryption, and CBC_CTS_Decryption. Definition at line 101 of file cryptlib.cpp. References StreamTransformation::MandatoryBlockSize(), StreamTransformation::MinLastBlockSize(), and StreamTransformation::ProcessData(). Referenced by StreamTransformationFilter::LastPut(). |
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returns whether this object can be resynchronized (i.e. supports initialization vectors) If this function returns true, and no IV is passed to SetKey() and CanUseStructuredIVs()==true, an IV of all 0's will be assumed. Definition at line 384 of file cryptlib.h. Referenced by SimpleKeyingInterface::ThrowIfInvalidIV(), SimpleKeyingInterface::ThrowIfResynchronizable(), and BlockOrientedCipherModeBase::UncheckedSetKey(). |