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00028 #ifndef CRYPTOPP_STRCIPHR_H
00029 #define CRYPTOPP_STRCIPHR_H
00030
00031 #include "seckey.h"
00032 #include "secblock.h"
00033
00034 NAMESPACE_BEGIN(CryptoPP)
00035
00036 template <class POLICY_INTERFACE, class BASE = Empty>
00037 class AbstractPolicyHolder : public BASE
00038 {
00039 public:
00040 typedef POLICY_INTERFACE PolicyInterface;
00041
00042 protected:
00043 virtual const POLICY_INTERFACE & GetPolicy() const =0;
00044 virtual POLICY_INTERFACE & AccessPolicy() =0;
00045 };
00046
00047 template <class POLICY, class BASE, class POLICY_INTERFACE = CPP_TYPENAME BASE::PolicyInterface>
00048 class ConcretePolicyHolder : public BASE, protected POLICY
00049 {
00050 protected:
00051 const POLICY_INTERFACE & GetPolicy() const {return *this;}
00052 POLICY_INTERFACE & AccessPolicy() {return *this;}
00053 };
00054
00055 enum KeystreamOperation {WRITE_KEYSTREAM, XOR_KEYSTREAM, XOR_KEYSTREAM_INPLACE};
00056
00057 struct AdditiveCipherAbstractPolicy
00058 {
00059 virtual unsigned int GetAlignment() const =0;
00060 virtual unsigned int GetBytesPerIteration() const =0;
00061 virtual unsigned int GetIterationsToBuffer() const =0;
00062 virtual void WriteKeystream(byte *keystreamBuffer, unsigned int iterationCount) =0;
00063 virtual bool CanOperateKeystream() const {return false;}
00064 virtual void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, unsigned int iterationCount) {assert(false);}
00065 virtual void CipherSetKey(const NameValuePairs ¶ms, const byte *key, unsigned int length) =0;
00066 virtual void CipherResynchronize(byte *keystreamBuffer, const byte *iv) {throw NotImplemented("StreamTransformation: this object doesn't support resynchronization");}
00067 virtual bool IsRandomAccess() const =0;
00068 virtual void SeekToIteration(dword iterationCount) {assert(!IsRandomAccess()); throw NotImplemented("StreamTransformation: this object doesn't support random access");}
00069 };
00070
00071 template <typename WT, unsigned int W, unsigned int X = 1, class BASE = AdditiveCipherAbstractPolicy>
00072 struct AdditiveCipherConcretePolicy : public BASE
00073 {
00074 typedef WT WordType;
00075
00076 unsigned int GetAlignment() const {return sizeof(WordType);}
00077 unsigned int GetBytesPerIteration() const {return sizeof(WordType) * W;}
00078 unsigned int GetIterationsToBuffer() const {return X;}
00079 void WriteKeystream(byte *buffer, unsigned int iterationCount)
00080 {OperateKeystream(WRITE_KEYSTREAM, buffer, NULL, iterationCount);}
00081 bool CanOperateKeystream() const {return true;}
00082 virtual void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, unsigned int iterationCount) =0;
00083
00084 template <class B>
00085 struct KeystreamOutput
00086 {
00087 KeystreamOutput(KeystreamOperation operation, byte *output, const byte *input)
00088 : m_operation(operation), m_output(output), m_input(input) {}
00089
00090 inline KeystreamOutput & operator()(WordType keystreamWord)
00091 {
00092 assert(IsAligned<WordType>(m_input));
00093 assert(IsAligned<WordType>(m_output));
00094
00095 if (!NativeByteOrderIs(B::ToEnum()))
00096 keystreamWord = ByteReverse(keystreamWord);
00097
00098 if (m_operation == WRITE_KEYSTREAM)
00099 *(WordType*)m_output = keystreamWord;
00100 else if (m_operation == XOR_KEYSTREAM)
00101 {
00102 *(WordType*)m_output = keystreamWord ^ *(WordType*)m_input;
00103 m_input += sizeof(WordType);
00104 }
00105 else if (m_operation == XOR_KEYSTREAM_INPLACE)
00106 *(WordType*)m_output ^= keystreamWord;
00107
00108 m_output += sizeof(WordType);
00109
00110 return *this;
00111 }
00112
00113 KeystreamOperation m_operation;
00114 byte *m_output;
00115 const byte *m_input;
00116 };
00117 };
00118
00119 template <class BASE = AbstractPolicyHolder<AdditiveCipherAbstractPolicy, TwoBases<SymmetricCipher, RandomNumberGenerator> > >
00120 class AdditiveCipherTemplate : public BASE
00121 {
00122 public:
00123 byte GenerateByte();
00124 void ProcessData(byte *outString, const byte *inString, unsigned int length);
00125 void Resynchronize(const byte *iv);
00126 unsigned int OptimalBlockSize() const {return GetPolicy().GetBytesPerIteration();}
00127 unsigned int GetOptimalNextBlockSize() const {return m_leftOver;}
00128 unsigned int OptimalDataAlignment() const {return GetPolicy().GetAlignment();}
00129 bool IsSelfInverting() const {return true;}
00130 bool IsForwardTransformation() const {return true;}
00131 bool IsRandomAccess() const {return GetPolicy().IsRandomAccess();}
00132 void Seek(dword position);
00133
00134 typedef typename BASE::PolicyInterface PolicyInterface;
00135
00136 protected:
00137 void UncheckedSetKey(const NameValuePairs ¶ms, const byte *key, unsigned int length);
00138
00139 unsigned int GetBufferByteSize(const PolicyInterface &policy) const {return policy.GetBytesPerIteration() * policy.GetIterationsToBuffer();}
00140
00141 inline byte * KeystreamBufferBegin() {return m_buffer.data();}
00142 inline byte * KeystreamBufferEnd() {return (m_buffer.data() + m_buffer.size());}
00143
00144 SecByteBlock m_buffer;
00145 unsigned int m_leftOver;
00146 };
00147
00148 struct CFB_CipherAbstractPolicy
00149 {
00150 virtual unsigned int GetAlignment() const =0;
00151 virtual unsigned int GetBytesPerIteration() const =0;
00152 virtual byte * GetRegisterBegin() =0;
00153 virtual void TransformRegister() =0;
00154 virtual bool CanIterate() const {return false;}
00155 virtual void Iterate(byte *output, const byte *input, CipherDir dir, unsigned int iterationCount) {assert(false);}
00156 virtual void CipherSetKey(const NameValuePairs ¶ms, const byte *key, unsigned int length) =0;
00157 virtual void CipherResynchronize(const byte *iv) {throw NotImplemented("StreamTransformation: this object doesn't support resynchronization");}
00158 };
00159
00160 template <typename WT, unsigned int W, class BASE = CFB_CipherAbstractPolicy>
00161 struct CFB_CipherConcretePolicy : public BASE
00162 {
00163 typedef WT WordType;
00164
00165 unsigned int GetAlignment() const {return sizeof(WordType);}
00166 unsigned int GetBytesPerIteration() const {return sizeof(WordType) * W;}
00167 bool CanIterate() const {return true;}
00168 void TransformRegister() {Iterate(NULL, NULL, ENCRYPTION, 1);}
00169
00170 template <class B>
00171 struct RegisterOutput
00172 {
00173 RegisterOutput(byte *output, const byte *input, CipherDir dir)
00174 : m_output(output), m_input(input), m_dir(dir) {}
00175
00176 inline RegisterOutput& operator()(WordType ®isterWord)
00177 {
00178 assert(IsAligned<WordType>(m_output));
00179 assert(IsAligned<WordType>(m_input));
00180
00181 if (!NativeByteOrderIs(B::ToEnum()))
00182 registerWord = ByteReverse(registerWord);
00183
00184 if (m_dir == ENCRYPTION)
00185 {
00186 WordType ct = *(const WordType *)m_input ^ registerWord;
00187 registerWord = ct;
00188 *(WordType*)m_output = ct;
00189 m_input += sizeof(WordType);
00190 m_output += sizeof(WordType);
00191 }
00192 else
00193 {
00194 WordType ct = *(const WordType *)m_input;
00195 *(WordType*)m_output = registerWord ^ ct;
00196 registerWord = ct;
00197 m_input += sizeof(WordType);
00198 m_output += sizeof(WordType);
00199 }
00200
00201
00202
00203 return *this;
00204 }
00205
00206 byte *m_output;
00207 const byte *m_input;
00208 CipherDir m_dir;
00209 };
00210 };
00211
00212 template <class BASE>
00213 class CFB_CipherTemplate : public BASE
00214 {
00215 public:
00216 void ProcessData(byte *outString, const byte *inString, unsigned int length);
00217 void Resynchronize(const byte *iv);
00218 unsigned int OptimalBlockSize() const {return GetPolicy().GetBytesPerIteration();}
00219 unsigned int GetOptimalNextBlockSize() const {return m_leftOver;}
00220 unsigned int OptimalDataAlignment() const {return GetPolicy().GetAlignment();}
00221 bool IsRandomAccess() const {return false;}
00222 bool IsSelfInverting() const {return false;}
00223
00224 typedef typename BASE::PolicyInterface PolicyInterface;
00225
00226 protected:
00227 virtual void CombineMessageAndShiftRegister(byte *output, byte *reg, const byte *message, unsigned int length) =0;
00228
00229 void UncheckedSetKey(const NameValuePairs ¶ms, const byte *key, unsigned int length);
00230
00231 unsigned int m_leftOver;
00232 };
00233
00234 template <class BASE = AbstractPolicyHolder<CFB_CipherAbstractPolicy, SymmetricCipher> >
00235 class CFB_EncryptionTemplate : public CFB_CipherTemplate<BASE>
00236 {
00237 bool IsForwardTransformation() const {return true;}
00238 void CombineMessageAndShiftRegister(byte *output, byte *reg, const byte *message, unsigned int length);
00239 };
00240
00241 template <class BASE = AbstractPolicyHolder<CFB_CipherAbstractPolicy, SymmetricCipher> >
00242 class CFB_DecryptionTemplate : public CFB_CipherTemplate<BASE>
00243 {
00244 bool IsForwardTransformation() const {return false;}
00245 void CombineMessageAndShiftRegister(byte *output, byte *reg, const byte *message, unsigned int length);
00246 };
00247
00248 template <class BASE, class INFO = BASE>
00249 class SymmetricCipherFinalTemplate : public AlgorithmImpl<SimpleKeyingInterfaceImpl<BASE, INFO>, INFO>
00250 {
00251 public:
00252 SymmetricCipherFinalTemplate() {}
00253 SymmetricCipherFinalTemplate(const byte *key)
00254 {SetKey(key, DEFAULT_KEYLENGTH);}
00255 SymmetricCipherFinalTemplate(const byte *key, unsigned int length)
00256 {SetKey(key, length);}
00257 SymmetricCipherFinalTemplate(const byte *key, unsigned int length, const byte *iv)
00258 {SetKey(key, length); Resynchronize(iv);}
00259
00260 void SetKey(const byte *key, unsigned int length, const NameValuePairs ¶ms = g_nullNameValuePairs)
00261 {
00262 ThrowIfInvalidKeyLength(length);
00263 UncheckedSetKey(params, key, length);
00264 }
00265
00266 Clonable * Clone() const {return static_cast<SymmetricCipher *>(new SymmetricCipherFinalTemplate<BASE, INFO>(*this));}
00267 };
00268
00269 template <class S>
00270 void AdditiveCipherTemplate<S>::UncheckedSetKey(const NameValuePairs ¶ms, const byte *key, unsigned int length)
00271 {
00272 PolicyInterface &policy = AccessPolicy();
00273 policy.CipherSetKey(params, key, length);
00274 m_buffer.New(GetBufferByteSize(policy));
00275 m_leftOver = 0;
00276 }
00277
00278 template <class BASE>
00279 void CFB_CipherTemplate<BASE>::UncheckedSetKey(const NameValuePairs ¶ms, const byte *key, unsigned int length)
00280 {
00281 PolicyInterface &policy = AccessPolicy();
00282 policy.CipherSetKey(params, key, length);
00283 m_leftOver = policy.GetBytesPerIteration();
00284 }
00285
00286 NAMESPACE_END
00287
00288 #endif