Crypto++
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Public Types | |
enum | IV_Requirement { UNIQUE_IV = 0, RANDOM_IV, UNPREDICTABLE_RANDOM_IV, INTERNALLY_GENERATED_IV, NOT_RESYNCHRONIZABLE } |
Public Member Functions | |
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 | |
unsigned int | OptimalDataAlignment () const |
returns how input should be aligned for optimal performance | |
unsigned int | IVSize () const |
virtual IV_Requirement | IVRequirement () const =0 |
returns the minimal requirement for secure IVs | |
void | SetCipher (BlockCipher &cipher) |
void | SetCipherWithIV (BlockCipher &cipher, const byte *iv, int feedbackSize=0) |
virtual void | SetKey (const byte *key, size_t length, const NameValuePairs ¶ms=g_nullNameValuePairs) |
set or reset the key of this object More... | |
void | SetKeyWithRounds (const byte *key, size_t length, int rounds) |
calls SetKey() with an NameValuePairs object that just specifies "Rounds" | |
void | SetKeyWithIV (const byte *key, size_t length, const byte *iv, size_t ivLength) |
calls SetKey() with an NameValuePairs object that just specifies "IV" | |
void | SetKeyWithIV (const byte *key, size_t 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) More... | |
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) | |
unsigned int | DefaultIVLength () const |
returns default length of IVs accepted by this object | |
virtual unsigned int | MinIVLength () const |
returns minimal length of IVs accepted by this object | |
virtual unsigned int | MaxIVLength () const |
returns maximal length of IVs accepted by this object | |
virtual void | Resynchronize (const byte *iv, int ivLength=-1) |
resynchronize with an IV. ivLength=-1 means use IVSize() | |
virtual void | GetNextIV (RandomNumberGenerator &rng, byte *IV) |
get a secure IV for the next message More... | |
StreamTransformation & | Ref () |
return a reference to this object, useful for passing a temporary object to a function that takes a non-const reference | |
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 More... | |
virtual unsigned int | GetOptimalBlockSizeUsed () const |
returns how much of the current block is used up | |
virtual void | ProcessData (byte *outString, const byte *inString, size_t length)=0 |
encrypt or decrypt an array of bytes of specified length More... | |
virtual void | ProcessLastBlock (byte *outString, const byte *inString, size_t length) |
for ciphers where the last block of data is special, encrypt or decrypt the last block of data More... | |
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, size_t length) |
same as ProcessData(inoutString, inoutString, length) | |
void | ProcessString (byte *outString, const byte *inString, size_t length) |
same as ProcessData(outString, inString, length) | |
byte | ProcessByte (byte input) |
implemented as {ProcessData(&input, &input, 1); return input;} | |
virtual bool | IsRandomAccess () const =0 |
returns whether this cipher supports random access | |
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 | |
Protected Member Functions | |
unsigned int | BlockSize () const |
virtual void | SetFeedbackSize (unsigned int feedbackSize) |
virtual void | ResizeBuffers () |
const Algorithm & | GetAlgorithm () const |
virtual void | UncheckedSetKey (const byte *key, unsigned int length, const NameValuePairs ¶ms)=0 |
void | ThrowIfInvalidKeyLength (size_t length) |
void | ThrowIfResynchronizable () |
void | ThrowIfInvalidIV (const byte *iv) |
size_t | ThrowIfInvalidIVLength (int size) |
const byte * | GetIVAndThrowIfInvalid (const NameValuePairs ¶ms, size_t &size) |
void | AssertValidKeyLength (size_t length) const |
Protected Attributes | |
BlockCipher * | m_cipher |
AlignedSecByteBlock | m_register |
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virtualinherited |
set or reset the key of this object
params | is used to specify Rounds, BlockSize, etc. |
Reimplemented in ECB_OneWay, and AuthenticatedSymmetricCipherBase.
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inlineinherited |
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 385 of file cryptlib.h.
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virtualinherited |
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 in VMAC_Base.
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inlinevirtualinherited |
returns the input block size that is most efficient for this cipher
Reimplemented in ECB_OneWay.
Definition at line 480 of file cryptlib.h.
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pure virtualinherited |
encrypt or decrypt an array of bytes of specified length
Implemented in CBC_Decryption, CBC_Encryption, ECB_OneWay, AuthenticatedSymmetricCipherBase, Weak1::ARC4_Base, and PublicBlumBlumShub.
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virtualinherited |
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_Decryption, and CBC_CTS_Encryption.