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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 modes documentation. See NIST SP 800-38A for definitions of these modes. See AuthenticatedSymmetricCipherDocumentation for authenticated encryption 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     size_t MinKeyLength() const {return m_cipher->MinKeyLength();}
    00035     size_t MaxKeyLength() const {return m_cipher->MaxKeyLength();}
    00036     size_t DefaultKeyLength() const {return m_cipher->DefaultKeyLength();}
    00037     size_t GetValidKeyLength(size_t n) const {return m_cipher->GetValidKeyLength(n);}
    00038     bool IsValidKeyLength(size_t n) const {return m_cipher->IsValidKeyLength(n);}
    00039
    00040     unsigned int OptimalDataAlignment() const {return m_cipher->OptimalDataAlignment();}
    00041
    00042     unsigned int IVSize() const {return BlockSize();}
    00043     virtual IV_Requirement IVRequirement() const =0;
    00044
    00045     void SetCipher(BlockCipher &cipher)
    00046     {
    00047         this->ThrowIfResynchronizable();
    00048         this->m_cipher = &cipher;
    00049         this->ResizeBuffers();
    00050     }
    00051
    00052     void SetCipherWithIV(BlockCipher &cipher, const byte *iv, int feedbackSize = 0)
    00053     {
    00054         this->ThrowIfInvalidIV(iv);
    00055         this->m_cipher = &cipher;
    00056         this->ResizeBuffers();
    00057         this->SetFeedbackSize(feedbackSize);
    00058         if (this->IsResynchronizable())
    00059             this->Resynchronize(iv);
    00060     }
    00061
    00062 protected:
    00063     CipherModeBase() : m_cipher(NULL) {}
    00064     inline unsigned int BlockSize() const {assert(m_register.size() > 0); return (unsigned int)m_register.size();}
    00065     virtual void SetFeedbackSize(unsigned int feedbackSize)
    00066     {
    00067         if (!(feedbackSize == 0 || feedbackSize == BlockSize()))
    00068             throw InvalidArgument("CipherModeBase: feedback size cannot be specified for this cipher mode");
    00069     }
    00070     virtual void ResizeBuffers()
    00071     {
    00072         m_register.New(m_cipher->BlockSize());
    00073     }
    00074
    00075     BlockCipher *m_cipher;
    00076     AlignedSecByteBlock m_register;
    00077 };
    00078
    00079 template <class POLICY_INTERFACE>
    00080 class CRYPTOPP_NO_VTABLE ModePolicyCommonTemplate : public CipherModeBase, public POLICY_INTERFACE
    00081 {
    00082     unsigned int GetAlignment() const {return m_cipher->OptimalDataAlignment();}
    00083     void CipherSetKey(const NameValuePairs &params, const byte *key, size_t length);
    00084 };
    00085
    00086 template <class POLICY_INTERFACE>
    00087 void ModePolicyCommonTemplate<POLICY_INTERFACE>::CipherSetKey(const NameValuePairs &params, const byte *key, size_t length)
    00088 {
    00089     m_cipher->SetKey(key, length, params);
    00090     ResizeBuffers();
    00091     int feedbackSize = params.GetIntValueWithDefault(Name::FeedbackSize(), 0);
    00092     SetFeedbackSize(feedbackSize);
    00093 }
    00094
    00095 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CFB_ModePolicy : public ModePolicyCommonTemplate<CFB_CipherAbstractPolicy>
    00096 {
    00097 public:
    00098     IV_Requirement IVRequirement() const {return RANDOM_IV;}
    00099     static const char * CRYPTOPP_API StaticAlgorithmName() {return "CFB";}
    00100
    00101 protected:
    00102     unsigned int GetBytesPerIteration() const {return m_feedbackSize;}
    00103     byte * GetRegisterBegin() {return m_register + BlockSize() - m_feedbackSize;}
    00104     bool CanIterate() const {return m_feedbackSize == BlockSize();}
    00105     void Iterate(byte *output, const byte *input, CipherDir dir, size_t iterationCount);
    00106     void TransformRegister();
    00107     void CipherResynchronize(const byte *iv, size_t length);
    00108     void SetFeedbackSize(unsigned int feedbackSize);
    00109     void ResizeBuffers();
    00110
    00111     SecByteBlock m_temp;
    00112     unsigned int m_feedbackSize;
    00113 };
    00114
    00115 inline void CopyOrZero(void *dest, const void *src, size_t s)
    00116 {
    00117     if (src)
    00118         memcpy_s(dest, s, src, s);
    00119     else
    00120         memset(dest, 0, s);
    00121 }
    00122
    00123 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE OFB_ModePolicy : public ModePolicyCommonTemplate<AdditiveCipherAbstractPolicy>
    00124 {
    00125 public:
    00126     bool CipherIsRandomAccess() const {return false;}
    00127     IV_Requirement IVRequirement() const {return UNIQUE_IV;}
    00128     static const char * CRYPTOPP_API StaticAlgorithmName() {return "OFB";}
    00129
    00130 private:
    00131     unsigned int GetBytesPerIteration() const {return BlockSize();}
    00132     unsigned int GetIterationsToBuffer() const {return m_cipher->OptimalNumberOfParallelBlocks();}
    00133     void WriteKeystream(byte *keystreamBuffer, size_t iterationCount);
    00134     void CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length);
    00135 };
    00136
    00137 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CTR_ModePolicy : public ModePolicyCommonTemplate<AdditiveCipherAbstractPolicy>
    00138 {
    00139 public:
    00140     bool CipherIsRandomAccess() const {return true;}
    00141     IV_Requirement IVRequirement() const {return RANDOM_IV;}
    00142     static const char * CRYPTOPP_API StaticAlgorithmName() {return "CTR";}
    00143
    00144 protected:
    00145     virtual void IncrementCounterBy256();
    00146
    00147     unsigned int GetAlignment() const {return m_cipher->OptimalDataAlignment();}
    00148     unsigned int GetBytesPerIteration() const {return BlockSize();}
    00149     unsigned int GetIterationsToBuffer() const {return m_cipher->OptimalNumberOfParallelBlocks();}
    00150     void WriteKeystream(byte *buffer, size_t iterationCount)
    00151         {OperateKeystream(WRITE_KEYSTREAM, buffer, NULL, iterationCount);}
    00152     bool CanOperateKeystream() const {return true;}
    00153     void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount);
    00154     void CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length);
    00155     void SeekToIteration(lword iterationCount);
    00156
    00157     AlignedSecByteBlock m_counterArray;
    00158 };
    00159
    00160 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE BlockOrientedCipherModeBase : public CipherModeBase
    00161 {
    00162 public:
    00163     void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &params);
    00164     unsigned int MandatoryBlockSize() const {return BlockSize();}
    00165     bool IsRandomAccess() const {return false;}
    00166     bool IsSelfInverting() const {return false;}
    00167     bool IsForwardTransformation() const {return m_cipher->IsForwardTransformation();}
    00168     void Resynchronize(const byte *iv, int length=-1) {memcpy_s(m_register, m_register.size(), iv, ThrowIfInvalidIVLength(length));}
    00169
    00170 protected:
    00171     bool RequireAlignedInput() const {return true;}
    00172     void ResizeBuffers()
    00173     {
    00174         CipherModeBase::ResizeBuffers();
    00175         m_buffer.New(BlockSize());
    00176     }
    00177
    00178     SecByteBlock m_buffer;
    00179 };
    00180
    00181 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE ECB_OneWay : public BlockOrientedCipherModeBase
    00182 {
    00183 public:
    00184     void SetKey(const byte *key, size_t length, const NameValuePairs &params = g_nullNameValuePairs)
    00185         {m_cipher->SetKey(key, length, params); BlockOrientedCipherModeBase::ResizeBuffers();}
    00186     IV_Requirement IVRequirement() const {return NOT_RESYNCHRONIZABLE;}
    00187     unsigned int OptimalBlockSize() const {return BlockSize() * m_cipher->OptimalNumberOfParallelBlocks();}
    00188     void ProcessData(byte *outString, const byte *inString, size_t length);
    00189     static const char * CRYPTOPP_API StaticAlgorithmName() {return "ECB";}
    00190 };
    00191
    00192 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_ModeBase : public BlockOrientedCipherModeBase
    00193 {
    00194 public:
    00195     IV_Requirement IVRequirement() const {return UNPREDICTABLE_RANDOM_IV;}
    00196     bool RequireAlignedInput() const {return false;}
    00197     unsigned int MinLastBlockSize() const {return 0;}
    00198     static const char * CRYPTOPP_API StaticAlgorithmName() {return "CBC";}
    00199 };
    00200
    00201 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_Encryption : public CBC_ModeBase
    00202 {
    00203 public:
    00204     void ProcessData(byte *outString, const byte *inString, size_t length);
    00205 };
    00206
    00207 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_CTS_Encryption : public CBC_Encryption
    00208 {
    00209 public:
    00210     void SetStolenIV(byte *iv) {m_stolenIV = iv;}
    00211     unsigned int MinLastBlockSize() const {return BlockSize()+1;}
    00212     void ProcessLastBlock(byte *outString, const byte *inString, size_t length);
    00213     static const char * CRYPTOPP_API StaticAlgorithmName() {return "CBC/CTS";}
    00214
    00215 protected:
    00216     void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &params)
    00217     {
    00218         CBC_Encryption::UncheckedSetKey(key, length, params);
    00219         m_stolenIV = params.GetValueWithDefault(Name::StolenIV(), (byte *)NULL);
    00220     }
    00221
    00222     byte *m_stolenIV;
    00223 };
    00224
    00225 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_Decryption : public CBC_ModeBase
    00226 {
    00227 public:
    00228     void ProcessData(byte *outString, const byte *inString, size_t length);
    00229
    00230 protected:
    00231     void ResizeBuffers()
    00232     {
    00233         BlockOrientedCipherModeBase::ResizeBuffers();
    00234         m_temp.New(BlockSize());
    00235     }
    00236     AlignedSecByteBlock m_temp;
    00237 };
    00238
    00239 class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CBC_CTS_Decryption : public CBC_Decryption
    00240 {
    00241 public:
    00242     unsigned int MinLastBlockSize() const {return BlockSize()+1;}
    00243     void ProcessLastBlock(byte *outString, const byte *inString, size_t length);
    00244 };
    00245
    00246 //! _
    00247 template <class CIPHER, class BASE>
    00248 class CipherModeFinalTemplate_CipherHolder : protected ObjectHolder<CIPHER>, public AlgorithmImpl<BASE, CipherModeFinalTemplate_CipherHolder<CIPHER, BASE> >
    00249 {
    00250 public:
    00251     CipherModeFinalTemplate_CipherHolder()
    00252     {
    00253         this->m_cipher = &this->m_object;
    00254         this->ResizeBuffers();
    00255     }
    00256     CipherModeFinalTemplate_CipherHolder(const byte *key, size_t length)
    00257     {
    00258         this->m_cipher = &this->m_object;
    00259         this->SetKey(key, length);
    00260     }
    00261     CipherModeFinalTemplate_CipherHolder(const byte *key, size_t length, const byte *iv)
    00262     {
    00263         this->m_cipher = &this->m_object;
    00264         this->SetKey(key, length, MakeParameters(Name::IV(), ConstByteArrayParameter(iv, this->m_cipher->BlockSize())));
    00265     }
    00266     CipherModeFinalTemplate_CipherHolder(const byte *key, size_t length, const byte *iv, int feedbackSize)
    00267     {
    00268         this->m_cipher = &this->m_object;
    00269         this->SetKey(key, length, MakeParameters(Name::IV(), ConstByteArrayParameter(iv, this->m_cipher->BlockSize()))(Name::FeedbackSize(), feedbackSize));
    00270     }
    00271
    00272     static std::string CRYPTOPP_API StaticAlgorithmName()
    00273         {return CIPHER::StaticAlgorithmName() + "/" + BASE::StaticAlgorithmName();}
    00274 };
    00275
    00276 //! _
    00277 template <class BASE>
    00278 class CipherModeFinalTemplate_ExternalCipher : public BASE
    00279 {
    00280 public:
    00281     CipherModeFinalTemplate_ExternalCipher() {}
    00282     CipherModeFinalTemplate_ExternalCipher(BlockCipher &cipher)
    00283         {this->SetCipher(cipher);}
    00284     CipherModeFinalTemplate_ExternalCipher(BlockCipher &cipher, const byte *iv, int feedbackSize = 0)
    00285         {this->SetCipherWithIV(cipher, iv, feedbackSize);}
    00286
    00287     std::string AlgorithmName() const
    00288         {return (this->m_cipher ? this->m_cipher->AlgorithmName() + "/" : std::string("")) + BASE::StaticAlgorithmName();}
    00289 };
    00290
    00291 CRYPTOPP_DLL_TEMPLATE_CLASS CFB_CipherTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> >;
    00292 CRYPTOPP_DLL_TEMPLATE_CLASS CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> >;
    00293 CRYPTOPP_DLL_TEMPLATE_CLASS CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> >;
    00294
    00295 //! CFB mode
    00296 template <class CIPHER>
    00297 struct CFB_Mode : public CipherModeDocumentation
    00298 {
    00299     typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Encryption;
    00300     typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Decryption;
    00301 };
    00302
    00303 //! CFB mode, external cipher
    00304 struct CFB_Mode_ExternalCipher : public CipherModeDocumentation
    00305 {
    00306     typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Encryption;
    00307     typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > Decryption;
    00308 };
    00309
    00310 //! CFB mode FIPS variant, requiring full block plaintext according to FIPS 800-38A
    00311 template <class CIPHER>
    00312 struct CFB_FIPS_Mode : public CipherModeDocumentation
    00313 {
    00314     typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Encryption;
    00315     typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Decryption;
    00316 };
    00317
    00318 //! CFB mode FIPS variant, requiring full block plaintext according to FIPS 800-38A, external cipher
    00319 struct CFB_FIPS_Mode_ExternalCipher : public CipherModeDocumentation
    00320 {
    00321     typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Encryption;
    00322     typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, CFB_RequireFullDataBlocks<CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, CFB_ModePolicy> > > > > Decryption;
    00323 };
    00324
    00325 CRYPTOPP_DLL_TEMPLATE_CLASS AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, OFB_ModePolicy> >;
    00326
    00327 //! OFB mode
    00328 template <class CIPHER>
    00329 struct OFB_Mode : public CipherModeDocumentation
    00330 {
    00331     typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, OFB_ModePolicy> > > > Encryption;
    00332     typedef Encryption Decryption;
    00333 };
    00334
    00335 //! OFB mode, external cipher
    00336 struct OFB_Mode_ExternalCipher : public CipherModeDocumentation
    00337 {
    00338     typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, OFB_ModePolicy> > > > Encryption;
    00339     typedef Encryption Decryption;
    00340 };
    00341
    00342 CRYPTOPP_DLL_TEMPLATE_CLASS AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, CTR_ModePolicy> >;
    00343 CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, CTR_ModePolicy> > > >;
    00344
    00345 //! CTR mode
    00346 template <class CIPHER>
    00347 struct CTR_Mode : public CipherModeDocumentation
    00348 {
    00349     typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, CTR_ModePolicy> > > > Encryption;
    00350     typedef Encryption Decryption;
    00351 };
    00352
    00353 //! CTR mode, external cipher
    00354 struct CTR_Mode_ExternalCipher : public CipherModeDocumentation
    00355 {
    00356     typedef CipherModeFinalTemplate_ExternalCipher<ConcretePolicyHolder<Empty, AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, CTR_ModePolicy> > > > Encryption;
    00357     typedef Encryption Decryption;
    00358 };
    00359
    00360 //! ECB mode
    00361 template <class CIPHER>
    00362 struct ECB_Mode : public CipherModeDocumentation
    00363 {
    00364     typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, ECB_OneWay> Encryption;
    00365     typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Decryption, ECB_OneWay> Decryption;
    00366 };
    00367
    00368 CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<ECB_OneWay>;
    00369
    00370 //! ECB mode, external cipher
    00371 struct ECB_Mode_ExternalCipher : public CipherModeDocumentation
    00372 {
    00373     typedef CipherModeFinalTemplate_ExternalCipher<ECB_OneWay> Encryption;
    00374     typedef Encryption Decryption;
    00375 };
    00376
    00377 //! CBC mode
    00378 template <class CIPHER>
    00379 struct CBC_Mode : public CipherModeDocumentation
    00380 {
    00381     typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, CBC_Encryption> Encryption;
    00382     typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Decryption, CBC_Decryption> Decryption;
    00383 };
    00384
    00385 CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_Encryption>;
    00386 CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_Decryption>;
    00387
    00388 //! CBC mode, external cipher
    00389 struct CBC_Mode_ExternalCipher : public CipherModeDocumentation
    00390 {
    00391     typedef CipherModeFinalTemplate_ExternalCipher<CBC_Encryption> Encryption;
    00392     typedef CipherModeFinalTemplate_ExternalCipher<CBC_Decryption> Decryption;
    00393 };
    00394
    00395 //! CBC mode with ciphertext stealing
    00396 template <class CIPHER>
    00397 struct CBC_CTS_Mode : public CipherModeDocumentation
    00398 {
    00399     typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Encryption, CBC_CTS_Encryption> Encryption;
    00400     typedef CipherModeFinalTemplate_CipherHolder<CPP_TYPENAME CIPHER::Decryption, CBC_CTS_Decryption> Decryption;
    00401 };
    00402
    00403 CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Encryption>;
    00404 CRYPTOPP_DLL_TEMPLATE_CLASS CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Decryption>;
    00405
    00406 //! CBC mode with ciphertext stealing, external cipher
    00407 struct CBC_CTS_Mode_ExternalCipher : public CipherModeDocumentation
    00408 {
    00409     typedef CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Encryption> Encryption;
    00410     typedef CipherModeFinalTemplate_ExternalCipher<CBC_CTS_Decryption> Decryption;
    00411 };
    00412
    00413 #ifdef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY
    00414 typedef CFB_Mode_ExternalCipher::Encryption CFBEncryption;
    00415 typedef CFB_Mode_ExternalCipher::Decryption CFBDecryption;
    00416 typedef OFB_Mode_ExternalCipher::Encryption OFB;
    00417 typedef CTR_Mode_ExternalCipher::Encryption CounterMode;
    00418 #endif
    00419
    00420 NAMESPACE_END
    00421
    00422 #endif