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# modes.h

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    00001 #ifndef CRYPTOPP_MODES_H
    00002 #define CRYPTOPP_MODES_H
    00003
    00004 /*! \file
    00005 */
    00006
    00007 #include "cryptlib.h"
    00008 #include "secblock.h"
    00009 #include "misc.h"
    00010 #include "strciphr.h"
    00011 #include "argnames.h"
    00012 #include "algparam.h"
    00013
    00014 NAMESPACE_BEGIN(CryptoPP)
    00015
    00016 //! Cipher mode documentation. See NIST SP 800-38A for definitions of these modes.
    00017
    00018 /*! Each class derived from this one defines two types, Encryption and Decryption,
    00019         both of which implement the SymmetricCipher interface.
    00020         For each mode there are two classes, one of which is a template class,
    00021         and the other one has a name that ends in "_ExternalCipher".
    00022         The "external cipher" mode objects hold a reference to the underlying block cipher,
    00023         instead of holding an instance of it. The reference must be passed in to the constructor.
    00024         For the "cipher holder" classes, the CIPHER template parameter should be a class
    00025         derived from BlockCipherDocumentation, for example DES or AES.
    00026 */
    00027 struct CipherModeDocumentation : public SymmetricCipherDocumentation
    00028 {
    00029 };
    00030
    00031 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CipherModeBase : public SymmetricCipher
    00032 {
    00033 public:
    00034         unsigned int MinKeyLength() const {return m_cipher->MinKeyLength();}
    00035         unsigned int MaxKeyLength() const {return m_cipher->MaxKeyLength();}
    00036         unsigned int DefaultKeyLength() const {return m_cipher->DefaultKeyLength();}
    00037         unsigned int GetValidKeyLength(unsigned int n) const {return m_cipher->GetValidKeyLength(n);}
    00038         bool IsValidKeyLength(unsigned int n) const {return m_cipher->IsValidKeyLength(n);}
    00039
    00040         void SetKey(const byte *key, unsigned int length, const NameValuePairs &params = g_nullNameValuePairs);
    00041
    00042         unsigned int OptimalDataAlignment() const {return BlockSize();}
    00043
    00044         unsigned int IVSize() const {return BlockSize();}
    00045         void GetNextIV(byte *IV);
    00046         virtual IV_Requirement IVRequirement() const =0;
    00047
    00048 protected:
    00049         inline unsigned int BlockSize() const {assert(m_register.size() > 0); return m_register.size();}
    00050         virtual void SetFeedbackSize(unsigned int feedbackSize)
    00051         {
    00052                 if (!(feedbackSize == 0 || feedbackSize == BlockSize()))
    00053                         throw InvalidArgument("CipherModeBase: feedback size cannot be specified for this cipher mode");
    00054         }
    00055         virtual void ResizeBuffers()
    00056         {
    00057                 m_register.New(m_cipher->BlockSize());
    00058         }
    00059         virtual void UncheckedSetKey(const NameValuePairs &params, const byte *key, unsigned int length, const byte *iv) =0;
    00060
    00061         BlockCipher *m_cipher;
    00062         SecByteBlock m_register;
    00063 };
    00064
    00065 template <class POLICY_INTERFACE>
    00066 class CRYPTOPP_NO_VTABLE ModePolicyCommonTemplate : public CipherModeBase, public POLICY_INTERFACE
    00067 {
    00068         unsigned int GetAlignment() const {return m_cipher->BlockAlignment();}
    00069         void CipherSetKey(const NameValuePairs &params, const byte *key, unsigned int length);
    00070 };
    00071
    00072 template <class POLICY_INTERFACE>
    00073 void ModePolicyCommonTemplate<POLICY_INTERFACE>::CipherSetKey(const NameValuePairs &params, const byte *key, unsigned int length)
    00074 {
    00075         m_cipher->SetKey(key, length, params);
    00076         ResizeBuffers();
    00077         int feedbackSize = params.GetIntValueWithDefault(Name::FeedbackSize(), 0);
    00078         SetFeedbackSize(feedbackSize);
    00079 }
    00080
    00081 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CFB_ModePolicy : public ModePolicyCommonTemplate<CFB_CipherAbstractPolicy>
    00082 {
    00083 public:
    00084         IV_Requirement IVRequirement() const {return RANDOM_IV;}
    00085         static const char *StaticAlgorithmName() {return "CFB";}
    00086
    00087 protected:
    00088         unsigned int GetBytesPerIteration() const {return m_feedbackSize;}
    00089         byte * GetRegisterBegin() {return m_register + BlockSize() - m_feedbackSize;}
    00090         void TransformRegister()
    00091         {
    00092                 m_cipher->ProcessBlock(m_register, m_temp);
    00093                 memmove(m_register, m_register+m_feedbackSize, BlockSize()-m_feedbackSize);
    00094                 memcpy(m_register+BlockSize()-m_feedbackSize, m_temp, m_feedbackSize);
    00095         }
    00096         void CipherResynchronize(const byte *iv)
    00097         {
    00098                 memcpy(m_register, iv, BlockSize());
    00099                 TransformRegister();
    00100         }
    00101         void SetFeedbackSize(unsigned int feedbackSize)
    00102         {
    00103                 if (feedbackSize > BlockSize())
    00104                         throw InvalidArgument("CFB_Mode: invalid feedback size");
    00105                 m_feedbackSize = feedbackSize ? feedbackSize : BlockSize();
    00106         }
    00107         void ResizeBuffers()
    00108         {
    00109                 CipherModeBase::ResizeBuffers();
    00110                 m_temp.New(BlockSize());
    00111         }
    00112
    00113         SecByteBlock m_temp;
    00114         unsigned int m_feedbackSize;
    00115 };
    00116
    00117 inline void CopyOrZero(void *dest, const void *src, size_t s)
    00118 {
    00119         if (src)
    00120                 memcpy(dest, src, s);
    00121         else
    00122                 memset(dest, 0, s);
    00123 }
    00124
    00125 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE OFB_ModePolicy : public ModePolicyCommonTemplate<AdditiveCipherAbstractPolicy>
    00126 {
    00127 public:
    00128         bool IsRandomAccess() const {return false;}
    00129         IV_Requirement IVRequirement() const {return STRUCTURED_IV;}
    00130         static const char *StaticAlgorithmName() {return "OFB";}
    00131
    00132 private:
    00133         unsigned int GetBytesPerIteration() const {return BlockSize();}
    00134         unsigned int GetIterationsToBuffer() const {return 1;}
    00135         void WriteKeystream(byte *keystreamBuffer, unsigned int iterationCount)
    00136         {
    00137                 assert(iterationCount == 1);
    00138                 m_cipher->ProcessBlock(keystreamBuffer);
    00139                 memcpy(m_register, keystreamBuffer, BlockSize());
    00140         }
    00141         void CipherResynchronize(byte *keystreamBuffer, const byte *iv)
    00142         {
    00143                 CopyOrZero(keystreamBuffer, iv, BlockSize());
    00144         }
    00145 };
    00146
    00147 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CTR_ModePolicy : public ModePolicyCommonTemplate<AdditiveCipherAbstractPolicy>
    00148 {
    00149 public:
    00150         bool IsRandomAccess() const {return true;}
    00151         IV_Requirement IVRequirement() const {return STRUCTURED_IV;}
    00152         void GetNextIV(byte *IV);
    00153         static const char *StaticAlgorithmName() {return "Counter-BE";}
    00154
    00155 private:
    00156         unsigned int GetBytesPerIteration() const {return BlockSize();}
    00157         unsigned int GetIterationsToBuffer() const {return m_cipher->OptimalNumberOfParallelBlocks();}
    00158         void WriteKeystream(byte *buffer, unsigned int iterationCount)
    00159                 {OperateKeystream(WRITE_KEYSTREAM, buffer, NULL, iterationCount);}
    00160         bool CanOperateKeystream() const {return true;}
    00161         void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, unsigned int iterationCount);
    00162         void CipherResynchronize(byte *keystreamBuffer, const byte *iv);
    00163         void SeekToIteration(lword iterationCount);
    00164
    00165         inline void ProcessMultipleBlocks(byte *output, const byte *input, unsigned int n);
    00166
    00167         SecByteBlock m_counterArray;
    00168 };
    00169
    00170 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE BlockOrientedCipherModeBase : public CipherModeBase
    00171 {
    00172 public:
    00173         void UncheckedSetKey(const NameValuePairs &params, const byte *key, unsigned int length, const byte *iv);
    00174         unsigned int MandatoryBlockSize() const {return BlockSize();}
    00175         bool IsRandomAccess() const {return false;}
    00176         bool IsSelfInverting() const {return false;}
    00177         bool IsForwardTransformation() const {return m_cipher->IsForwardTransformation();}
    00178         void Resynchronize(const byte *iv) {memcpy(m_register, iv, BlockSize());}
    00179         void ProcessData(byte *outString, const byte *inString, unsigned int length);
    00180
    00181 protected:
    00182         bool RequireAlignedInput() const {return true;}
    00183         virtual void ProcessBlocks(byte *outString, const byte *inString, unsigned int numberOfBlocks) =0;
    00184         void ResizeBuffers()
    00185         {
    00186                 CipherModeBase::ResizeBuffers();
    00187                 m_buffer.New(BlockSize());
    00188         }
    00189
    00190         SecByteBlock m_buffer;
    00191 };
    00192
    00193 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE ECB_OneWay : public BlockOrientedCipherModeBase
    00194 {
    00195 public:
    00196         IV_Requirement IVRequirement() const {return NOT_RESYNCHRONIZABLE;}
    00197         unsigned int OptimalBlockSize() const {return BlockSize() * m_cipher->OptimalNumberOfParallelBlocks();}
    00198         void ProcessBlocks(byte *outString, const byte *inString, unsigned int numberOfBlocks)
    00199                 {m_cipher->ProcessAndXorMultipleBlocks(inString, NULL, outString, numberOfBlocks);}
    00200         static const char *StaticAlgorithmName() {return "ECB";}
    00201 };
    00202
    00203 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_ModeBase : public BlockOrientedCipherModeBase
    00204 {
    00205 public:
    00206         IV_Requirement IVRequirement() const {return UNPREDICTABLE_RANDOM_IV;}
    00207         bool RequireAlignedInput() const {return false;}
    00208         unsigned int MinLastBlockSize() const {return 0;}
    00209         static const char *StaticAlgorithmName() {return "CBC";}
    00210 };
    00211
    00212 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_Encryption : public CBC_ModeBase
    00213 {
    00214 public:
    00215         void ProcessBlocks(byte *outString, const byte *inString, unsigned int numberOfBlocks);
    00216 };
    00217
    00218 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_CTS_Encryption : public CBC_Encryption
    00219 {
    00220 public:
    00221         void SetStolenIV(byte *iv) {m_stolenIV = iv;}
    00222         unsigned int MinLastBlockSize() const {return BlockSize()+1;}
    00223         void ProcessLastBlock(byte *outString, const byte *inString, unsigned int length);
    00224         static const char *StaticAlgorithmName() {return "CBC/CTS";}
    00225
    00226 protected:
    00227         void UncheckedSetKey(const NameValuePairs &params, const byte *key, unsigned int length, const byte *iv)
    00228         {
    00229                 CBC_Encryption::UncheckedSetKey(params, key, length, iv);
    00230                 m_stolenIV = params.GetValueWithDefault(Name::StolenIV(), (byte *)NULL);
    00231         }
    00232
    00233         byte *m_stolenIV;
    00234 };
    00235
    00236 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_Decryption : public CBC_ModeBase
    00237 {
    00238 public:
    00239         void ProcessBlocks(byte *outString, const byte *inString, unsigned int numberOfBlocks);
    00240
    00241 protected:
    00242         void ResizeBuffers()
    00243         {
    00244                 BlockOrientedCipherModeBase::ResizeBuffers();
    00245                 m_temp.New(BlockSize());
    00246         }
    00247         SecByteBlock m_temp;
    00248 };
    00249
    00250 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_CTS_Decryption : public CBC_Decryption
    00251 {
    00252 public:
    00253         unsigned int MinLastBlockSize() const {return BlockSize()+1;}
    00254         void ProcessLastBlock(byte *outString, const byte *inString, unsigned int length);
    00255 };
    00256
    00257 //! _
    00258 template <class CIPHER, class BASE>
    00259 class CipherModeFinalTemplate_CipherHolder : protected ObjectHolder<CIPHER>, public AlgorithmImpl<BASE, CipherModeFinalTemplate_CipherHolder<CIPHER, BASE> >
    00260 {
    00261 public:
    00262         CipherModeFinalTemplate_CipherHolder()
    00263         {
    00264                 this->m_cipher = &this->m_object;
    00265                 this->ResizeBuffers();
    00266         }
    00267         CipherModeFinalTemplate_CipherHolder(const byte *key, unsigned int length)
    00268         {
    00269                 this->m_cipher = &this->m_object;
    00270                 this->SetKey(key, length);
    00271         }
    00272         CipherModeFinalTemplate_CipherHolder(const byte *key, unsigned int length, const byte *iv)
    00273         {
    00274                 this->m_cipher = &this->m_object;
    00275                 this->SetKey(key, length, MakeParameters(Name::IV(), iv));
    00276         }
    00277         CipherModeFinalTemplate_CipherHolder(const byte *key, unsigned int length, const byte *iv, int feedbackSize)
    00278         {
    00279                 this->m_cipher = &this->m_object;
    00280                 this->SetKey(key, length, MakeParameters(Name::IV(), iv)(Name::FeedbackSize(), feedbackSize));
    00281         }
    00282
    00283         static std::string StaticAlgorithmName()
    00284                 {return CIPHER::StaticAlgorithmName() + "/" + BASE::StaticAlgorithmName();}
    00285 };
    00286
    00287 //! _
    00288 template <class BASE>
    00289 class CipherModeFinalTemplate_ExternalCipher : public BASE
    00290 {
    00291 public:
    00292         CipherModeFinalTemplate_ExternalCipher() {}
    00293         CipherModeFinalTemplate_ExternalCipher(BlockCipher &cipher)
    00294                 {SetCipher(cipher);}
    00295         CipherModeFinalTemplate_ExternalCipher(BlockCipher &cipher, const byte *iv, int feedbackSize = 0)
    00296                 {SetCipherWithIV(cipher, iv, feedbackSize);}
    00297
    00298         void SetCipher(BlockCipher &cipher);
    00299         void SetCipherWithIV(BlockCipher &cipher, const byte *iv, int feedbackSize = 0);
    00300 };
    00301
    00302 template <class BASE>
    00303 void CipherModeFinalTemplate_ExternalCipher<BASE>::SetCipher(BlockCipher &cipher)
    00304 {
    00305         this->ThrowIfResynchronizable();
    00306         this->m_cipher = &cipher;
    00307         this->ResizeBuffers();
    00308 }
    00309
    00310 template <class BASE>
    00311 void CipherModeFinalTemplate_ExternalCipher<BASE>::SetCipherWithIV(BlockCipher &cipher, const byte *iv, int feedbackSize)
    00312 {
    00313         this->ThrowIfInvalidIV(iv);
    00314         this->m_cipher = &cipher;
    00315         this->ResizeBuffers();
    00316         this->SetFeedbackSize(feedbackSize);
    00317         if (this->IsResynchronizable())
    00318                 this->Resynchronize(iv);
    00319 }
    00320
    00321 CRYPTOPP_DLL_TEMPLATE_CLASS CFB_CipherTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> >;
    00322 CRYPTOPP_DLL_TEMPLATE_CLASS CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> >;
    00323 CRYPTOPP_DLL_TEMPLATE_CLASS CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> >;
    00324
    00325 //! CFB mode
    00326 template <class CIPHER>
    00327 struct CFB_Mode : public CipherModeDocumentation
    00328 {
    00329         typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Encryption;
    00330         typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Decryption;
    00331 };
    00332
    00333 //! CFB mode, external cipher
    00334 struct CFB_Mode_ExternalCipher : public CipherModeDocumentation
    00335 {
    00336         typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Encryption;
    00337         typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Decryption;
    00338 };
    00339
    00340 //! CFB mode FIPS variant, requiring full block plaintext according to FIPS 800-38A
    00341 template <class CIPHER>
    00342 struct CFB_FIPS_Mode : public CipherModeDocumentation
    00343 {
    00344         typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Encryption;
    00345         typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Decryption;
    00346 };
    00347
    00348 //! CFB mode FIPS variant, requiring full block plaintext according to FIPS 800-38A, external cipher
    00349 struct CFB_FIPS_Mode_ExternalCipher : public CipherModeDocumentation
    00350 {
    00351         typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Encryption;
    00352         typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Decryption;
    00353 };
    00354
    00355 CRYPTOPP_DLL_TEMPLATE_CLASS AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, OFB_ModePolicy> >;
    00356
    00357 //! OFB mode
    00358 template <class CIPHER>
    00359 struct OFB_Mode : public CipherModeDocumentation
    00360 {
    00361         typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, OFB_ModePolicy> > > > Encryption;
    00362         typedef Encryption Decryption;
    00363 };
    00364
    00365 //! OFB mode, external cipher
    00366 struct OFB_Mode_ExternalCipher : public CipherModeDocumentation
    00367 {
    00368         typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, OFB_ModePolicy> > > > Encryption;
    00369         typedef Encryption Decryption;
    00370 };
    00371
    00372 CRYPTOPP_DLL_TEMPLATE_CLASS AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, CTR_ModePolicy> >;
    00373
    00374 //! CTR mode
    00375 template <class CIPHER>
    00376 struct CTR_Mode : public CipherModeDocumentation
    00377 {
    00378         typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, CTR_ModePolicy> > > > Encryption;
    00379         typedef Encryption Decryption;
    00380 };
    00381
    00382 //! CTR mode, external cipher
    00383 struct CTR_Mode_ExternalCipher : public CipherModeDocumentation
    00384 {
    00385         typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, CTR_ModePolicy> > > > Encryption;
    00386         typedef Encryption Decryption;
    00387 };
    00388
    00389 //! ECB mode
    00390 template <class CIPHER>
    00391 struct ECB_Mode : public CipherModeDocumentation
    00392 {
    00393         typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ECB_OneWay> Encryption;
    00394         typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Decryption, ECB_OneWay> Decryption;
    00395 };
    00396
    00397 CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<ECB_OneWay>;
    00398
    00399 //! ECB mode, external cipher
    00400 struct ECB_Mode_ExternalCipher : public CipherModeDocumentation
    00401 {
    00402         typedef CipherModeFinalTemplate_ExternalCipher<ECB_OneWay> Encryption;
    00403         typedef Encryption Decryption;
    00404 };
    00405
    00406 //! CBC mode
    00407 template <class CIPHER>
    00408 struct CBC_Mode : public CipherModeDocumentation
    00409 {
    00410         typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, CBC_Encryption> Encryption;
    00411         typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Decryption, CBC_Decryption> Decryption;
    00412 };
    00413
    00414 CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_Encryption>;
    00415 CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_Decryption>;
    00416
    00417 //! CBC mode, external cipher
    00418 struct CBC_Mode_ExternalCipher : public CipherModeDocumentation
    00419 {
    00420         typedef CipherModeFinalTemplate_ExternalCipher<CBC_Encryption> Encryption;
    00421         typedef CipherModeFinalTemplate_ExternalCipher<CBC_Decryption> Decryption;
    00422 };
    00423
    00424 //! CBC mode with ciphertext stealing
    00425 template <class CIPHER>
    00426 struct CBC_CTS_Mode : public CipherModeDocumentation
    00427 {
    00428         typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, CBC_CTS_Encryption> Encryption;
    00429         typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Decryption, CBC_CTS_Decryption> Decryption;
    00430 };
    00431
    00432 CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Encryption>;
    00433 CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Decryption>;
    00434
    00435 //! CBC mode with ciphertext stealing, external cipher
    00436 struct CBC_CTS_Mode_ExternalCipher : public CipherModeDocumentation
    00437 {
    00438         typedef CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Encryption> Encryption;
    00439         typedef CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Decryption> Decryption;
    00440 };
    00441
    00442 #ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY
    00443 typedef CFB_Mode_ExternalCipher::Encryption CFBEncryption;
    00444 typedef CFB_Mode_ExternalCipher::Decryption CFBDecryption;
    00445 typedef OFB_Mode_ExternalCipher::Encryption OFB;
    00446 typedef CTR_Mode_ExternalCipher::Encryption CounterMode;
    00447 #endif
    00448
    00449 NAMESPACE_END
    00450
    00451 #endif