#include <arc4.h>
Inheritance diagram for MARC4:
Definition at line 49 of file arc4.h.
Public Types | |
typedef SymmetricCipherFinal< MARC4_Base > | Encryption |
implements the SymmetricCipher interface | |
typedef SymmetricCipherFinal< MARC4_Base > | Decryption |
implements the SymmetricCipher interface | |
enum | IV_Requirement { STRUCTURED_IV = 0, RANDOM_IV, UNPREDICTABLE_RANDOM_IV, INTERNALLY_GENERATED_IV, NOT_RESYNCHRONIZABLE } |
Public Member Functions | |
void | SetKey (const byte *key, unsigned int length, const NameValuePairs ¶ms=g_nullNameValuePairs) |
set or reset the key of this object | |
Clonable * | Clone () const |
this is not implemented by most classes yet | |
std::string | AlgorithmName () const |
returns name of this algorithm, not universally implemented yet | |
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()) | |
MARC4_Base::IV_Requirement | IVRequirement () const |
returns the minimal requirement for secure IVs | |
byte | GenerateByte () |
generate new random byte and return it | |
void | DiscardBytes (unsigned int n) |
generate and discard n bytes | |
void | ProcessData (byte *outString, const byte *inString, unsigned int length) |
encrypt or decrypt an array of bytes of specified length | |
bool | IsRandomAccess () const |
returns whether this cipher supports random access | |
bool | IsSelfInverting () const |
returns whether this transformation is self-inverting (e.g. xor with a keystream) | |
bool | IsForwardTransformation () const |
returns whether this is an encryption object | |
virtual unsigned int | GenerateBit () |
generate new random bit and return it | |
virtual word32 | GenerateWord32 (word32 a=0, word32 b=0xffffffffL) |
generate a random 32 bit word in the range min to max, inclusive | |
virtual void | GenerateBlock (byte *output, unsigned int size) |
generate random array of bytes | |
template<class IT> void | Shuffle (IT begin, IT end) |
randomly shuffle the specified array, resulting permutation is uniformly distributed | |
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 unsigned int | OptimalDataAlignment () const |
returns how input should be aligned for optimal performance | |
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 | IsValidKeyLength (unsigned int n) const |
returns whether n is a valid key length | |
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 unsigned int | IVSize () const |
returns size of IVs used by this object | |
virtual void | Resynchronize (const byte *IV) |
resynchronize with an IV | |
virtual void | GetNextIV (byte *IV) |
get a secure IV for the next message | |
Static Public Member Functions | |
std::string | StaticAlgorithmName () |
unsigned int | StaticGetValidKeyLength (unsigned int n) |
Protected Member Functions | |
void | AssertValidKeyLength (unsigned int length) |
void | AssertValidKeyLength (unsigned int length) const |
unsigned int | GetDefaultDiscardBytes () const |
void | UncheckedSetKey (const NameValuePairs ¶ms, const byte *key, unsigned int length, const byte *iv) |
void | ThrowIfInvalidKeyLength (const Algorithm &algorithm, unsigned int length) |
void | ThrowIfResynchronizable () |
void | ThrowIfInvalidIV (const byte *iv) |
const byte * | GetIVAndThrowIfInvalid (const NameValuePairs ¶ms) |
Protected Attributes | |
FixedSizeSecBlock< byte, 256 > | m_state |
byte | m_x |
byte | m_y |
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Implements SimpleKeyingInterface. Definition at line 277 of file strciphr.h. |
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generate and discard n bytes Default implementation is to call GenerateByte() n times. Reimplemented from RandomNumberGenerator. |
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encrypt or decrypt an array of bytes of specified length
Implements StreamTransformation. |
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generate new random bit and return it Default implementation is to call GenerateByte() and return its parity. Reimplemented in PublicBlumBlumShub. Definition at line 111 of file cryptlib.cpp. References RandomNumberGenerator::GenerateByte(). |
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generate random array of bytes Default implementation is to call GenerateByte() size times. Reimplemented in NonblockingRng, BlockingRng, and RandomPool. Definition at line 116 of file cryptlib.cpp. References RandomNumberGenerator::GenerateByte(). Referenced by DL_GroupParameters_DSA::GenerateRandom(). |
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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
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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. Definition at line 101 of file cryptlib.cpp. References StreamTransformation::MandatoryBlockSize(), StreamTransformation::MinLastBlockSize(), and StreamTransformation::ProcessData(). |
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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. |
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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. Definition at line 400 of file cryptlib.h. |