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+/*! \file
+ This file contains helper classes for implementing stream ciphers.
+
+ All this infrastructure may look very complex compared to what's in Crypto++ 4.x,
+ but stream ciphers implementations now support a lot of new functionality,
+ including better performance (minimizing copying), resetting of keys and IVs, and methods to
+ query which features are supported by a cipher.
+
+ Here's an explanation of these classes. The word "policy" is used here to mean a class with a
+ set of methods that must be implemented by individual stream cipher implementations.
+ This is usually much simpler than the full stream cipher API, which is implemented by
+ either AdditiveCipherTemplate or CFB_CipherTemplate using the policy. So for example, an
+ implementation of SEAL only needs to implement the AdditiveCipherAbstractPolicy interface
+ (since it's an additive cipher, i.e., it xors a keystream into the plaintext).
+ See this line in seal.h:
+
+ typedef SymmetricCipherFinal\<ConcretePolicyHolder\<SEAL_Policy\<B\>, AdditiveCipherTemplate\<\> \> \> Encryption;
+
+ AdditiveCipherTemplate and CFB_CipherTemplate are designed so that they don't need
+ to take a policy class as a template parameter (although this is allowed), so that
+ their code is not duplicated for each new cipher. Instead they each
+ get a reference to an abstract policy interface by calling AccessPolicy() on itself, so
+ AccessPolicy() must be overriden to return the actual policy reference. This is done
+ by the ConceretePolicyHolder class. Finally, SymmetricCipherFinal implements the constructors and
+ other functions that must be implemented by the most derived class.
+*/
+
+#ifndef CRYPTOPP_STRCIPHR_H
+#define CRYPTOPP_STRCIPHR_H
+
+#include "seckey.h"
+#include "secblock.h"
+#include "argnames.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+template <class POLICY_INTERFACE, class BASE = Empty>
+class CRYPTOPP_NO_VTABLE AbstractPolicyHolder : public BASE
+{
+public:
+ typedef POLICY_INTERFACE PolicyInterface;
+ virtual ~AbstractPolicyHolder() {}
+
+protected:
+ virtual const POLICY_INTERFACE & GetPolicy() const =0;
+ virtual POLICY_INTERFACE & AccessPolicy() =0;
+};
+
+template <class POLICY, class BASE, class POLICY_INTERFACE = CPP_TYPENAME BASE::PolicyInterface>
+class ConcretePolicyHolder : public BASE, protected POLICY
+{
+protected:
+ const POLICY_INTERFACE & GetPolicy() const {return *this;}
+ POLICY_INTERFACE & AccessPolicy() {return *this;}
+};
+
+enum KeystreamOperationFlags {OUTPUT_ALIGNED=1, INPUT_ALIGNED=2, INPUT_NULL = 4};
+enum KeystreamOperation {
+ WRITE_KEYSTREAM = INPUT_NULL,
+ WRITE_KEYSTREAM_ALIGNED = INPUT_NULL | OUTPUT_ALIGNED,
+ XOR_KEYSTREAM = 0,
+ XOR_KEYSTREAM_INPUT_ALIGNED = INPUT_ALIGNED,
+ XOR_KEYSTREAM_OUTPUT_ALIGNED= OUTPUT_ALIGNED,
+ XOR_KEYSTREAM_BOTH_ALIGNED = OUTPUT_ALIGNED | INPUT_ALIGNED};
+
+struct CRYPTOPP_DLL CRYPTOPP_NO_VTABLE AdditiveCipherAbstractPolicy
+{
+ virtual ~AdditiveCipherAbstractPolicy() {}
+ virtual unsigned int GetAlignment() const {return 1;}
+ virtual unsigned int GetBytesPerIteration() const =0;
+ virtual unsigned int GetOptimalBlockSize() const {return GetBytesPerIteration();}
+ virtual unsigned int GetIterationsToBuffer() const =0;
+ virtual void WriteKeystream(byte *keystream, size_t iterationCount)
+ {OperateKeystream(KeystreamOperation(INPUT_NULL | (KeystreamOperationFlags)IsAlignedOn(keystream, GetAlignment())), keystream, NULL, iterationCount);}
+ virtual bool CanOperateKeystream() const {return false;}
+ virtual void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount) {assert(false);}
+ virtual void CipherSetKey(const NameValuePairs &params, const byte *key, size_t length) =0;
+ virtual void CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length) {throw NotImplemented("SimpleKeyingInterface: this object doesn't support resynchronization");}
+ virtual bool CipherIsRandomAccess() const =0;
+ virtual void SeekToIteration(lword iterationCount) {assert(!CipherIsRandomAccess()); throw NotImplemented("StreamTransformation: this object doesn't support random access");}
+};
+
+template <typename WT, unsigned int W, unsigned int X = 1, class BASE = AdditiveCipherAbstractPolicy>
+struct CRYPTOPP_NO_VTABLE AdditiveCipherConcretePolicy : public BASE
+{
+ typedef WT WordType;
+ CRYPTOPP_CONSTANT(BYTES_PER_ITERATION = sizeof(WordType) * W)
+
+#if !(CRYPTOPP_BOOL_X86 || CRYPTOPP_BOOL_X64)
+ unsigned int GetAlignment() const {return GetAlignmentOf<WordType>();}
+#endif
+ unsigned int GetBytesPerIteration() const {return BYTES_PER_ITERATION;}
+ unsigned int GetIterationsToBuffer() const {return X;}
+ bool CanOperateKeystream() const {return true;}
+ virtual void OperateKeystream(KeystreamOperation operation, byte *output, const byte *input, size_t iterationCount) =0;
+};
+
+// use these to implement OperateKeystream
+#define CRYPTOPP_KEYSTREAM_OUTPUT_WORD(x, b, i, a) \
+ PutWord(bool(x & OUTPUT_ALIGNED), b, output+i*sizeof(WordType), (x & INPUT_NULL) ? a : a ^ GetWord<WordType>(bool(x & INPUT_ALIGNED), b, input+i*sizeof(WordType)));
+#define CRYPTOPP_KEYSTREAM_OUTPUT_XMM(x, i, a) {\
+ __m128i t = (x & INPUT_NULL) ? a : _mm_xor_si128(a, (x & INPUT_ALIGNED) ? _mm_load_si128((__m128i *)input+i) : _mm_loadu_si128((__m128i *)input+i));\
+ if (x & OUTPUT_ALIGNED) _mm_store_si128((__m128i *)output+i, t);\
+ else _mm_storeu_si128((__m128i *)output+i, t);}
+#define CRYPTOPP_KEYSTREAM_OUTPUT_SWITCH(x, y) \
+ switch (operation) \
+ { \
+ case WRITE_KEYSTREAM: \
+ x(WRITE_KEYSTREAM) \
+ break; \
+ case XOR_KEYSTREAM: \
+ x(XOR_KEYSTREAM) \
+ input += y; \
+ break; \
+ case XOR_KEYSTREAM_INPUT_ALIGNED: \
+ x(XOR_KEYSTREAM_INPUT_ALIGNED) \
+ input += y; \
+ break; \
+ case XOR_KEYSTREAM_OUTPUT_ALIGNED: \
+ x(XOR_KEYSTREAM_OUTPUT_ALIGNED) \
+ input += y; \
+ break; \
+ case WRITE_KEYSTREAM_ALIGNED: \
+ x(WRITE_KEYSTREAM_ALIGNED) \
+ break; \
+ case XOR_KEYSTREAM_BOTH_ALIGNED: \
+ x(XOR_KEYSTREAM_BOTH_ALIGNED) \
+ input += y; \
+ break; \
+ } \
+ output += y;
+
+template <class BASE = AbstractPolicyHolder<AdditiveCipherAbstractPolicy, SymmetricCipher> >
+class CRYPTOPP_NO_VTABLE AdditiveCipherTemplate : public BASE, public RandomNumberGenerator
+{
+public:
+ void GenerateBlock(byte *output, size_t size);
+ void ProcessData(byte *outString, const byte *inString, size_t length);
+ void Resynchronize(const byte *iv, int length=-1);
+ unsigned int OptimalBlockSize() const {return this->GetPolicy().GetOptimalBlockSize();}
+ unsigned int GetOptimalNextBlockSize() const {return (unsigned int)this->m_leftOver;}
+ unsigned int OptimalDataAlignment() const {return this->GetPolicy().GetAlignment();}
+ bool IsSelfInverting() const {return true;}
+ bool IsForwardTransformation() const {return true;}
+ bool IsRandomAccess() const {return this->GetPolicy().CipherIsRandomAccess();}
+ void Seek(lword position);
+
+ typedef typename BASE::PolicyInterface PolicyInterface;
+
+protected:
+ void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &params);
+
+ unsigned int GetBufferByteSize(const PolicyInterface &policy) const {return policy.GetBytesPerIteration() * policy.GetIterationsToBuffer();}
+
+ inline byte * KeystreamBufferBegin() {return this->m_buffer.data();}
+ inline byte * KeystreamBufferEnd() {return (this->m_buffer.data() + this->m_buffer.size());}
+
+ SecByteBlock m_buffer;
+ size_t m_leftOver;
+};
+
+class CRYPTOPP_DLL CRYPTOPP_NO_VTABLE CFB_CipherAbstractPolicy
+{
+public:
+ virtual ~CFB_CipherAbstractPolicy() {}
+ virtual unsigned int GetAlignment() const =0;
+ virtual unsigned int GetBytesPerIteration() const =0;
+ virtual byte * GetRegisterBegin() =0;
+ virtual void TransformRegister() =0;
+ virtual bool CanIterate() const {return false;}
+ virtual void Iterate(byte *output, const byte *input, CipherDir dir, size_t iterationCount) {assert(false); throw 0;}
+ virtual void CipherSetKey(const NameValuePairs &params, const byte *key, size_t length) =0;
+ virtual void CipherResynchronize(const byte *iv, size_t length) {throw NotImplemented("SimpleKeyingInterface: this object doesn't support resynchronization");}
+};
+
+template <typename WT, unsigned int W, class BASE = CFB_CipherAbstractPolicy>
+struct CRYPTOPP_NO_VTABLE CFB_CipherConcretePolicy : public BASE
+{
+ typedef WT WordType;
+
+ unsigned int GetAlignment() const {return sizeof(WordType);}
+ unsigned int GetBytesPerIteration() const {return sizeof(WordType) * W;}
+ bool CanIterate() const {return true;}
+ void TransformRegister() {this->Iterate(NULL, NULL, ENCRYPTION, 1);}
+
+ template <class B>
+ struct RegisterOutput
+ {
+ RegisterOutput(byte *output, const byte *input, CipherDir dir)
+ : m_output(output), m_input(input), m_dir(dir) {}
+
+ inline RegisterOutput& operator()(WordType &registerWord)
+ {
+ assert(IsAligned<WordType>(m_output));
+ assert(IsAligned<WordType>(m_input));
+
+ if (!NativeByteOrderIs(B::ToEnum()))
+ registerWord = ByteReverse(registerWord);
+
+ if (m_dir == ENCRYPTION)
+ {
+ if (m_input == NULL)
+ assert(m_output == NULL);
+ else
+ {
+ WordType ct = *(const WordType *)m_input ^ registerWord;
+ registerWord = ct;
+ *(WordType*)m_output = ct;
+ m_input += sizeof(WordType);
+ m_output += sizeof(WordType);
+ }
+ }
+ else
+ {
+ WordType ct = *(const WordType *)m_input;
+ *(WordType*)m_output = registerWord ^ ct;
+ registerWord = ct;
+ m_input += sizeof(WordType);
+ m_output += sizeof(WordType);
+ }
+
+ // registerWord is left unreversed so it can be xor-ed with further input
+
+ return *this;
+ }
+
+ byte *m_output;
+ const byte *m_input;
+ CipherDir m_dir;
+ };
+};
+
+template <class BASE>
+class CRYPTOPP_NO_VTABLE CFB_CipherTemplate : public BASE
+{
+public:
+ void ProcessData(byte *outString, const byte *inString, size_t length);
+ void Resynchronize(const byte *iv, int length=-1);
+ unsigned int OptimalBlockSize() const {return this->GetPolicy().GetBytesPerIteration();}
+ unsigned int GetOptimalNextBlockSize() const {return (unsigned int)m_leftOver;}
+ unsigned int OptimalDataAlignment() const {return this->GetPolicy().GetAlignment();}
+ bool IsRandomAccess() const {return false;}
+ bool IsSelfInverting() const {return false;}
+
+ typedef typename BASE::PolicyInterface PolicyInterface;
+
+protected:
+ virtual void CombineMessageAndShiftRegister(byte *output, byte *reg, const byte *message, size_t length) =0;
+
+ void UncheckedSetKey(const byte *key, unsigned int length, const NameValuePairs &params);
+
+ size_t m_leftOver;
+};
+
+template <class BASE = AbstractPolicyHolder<CFB_CipherAbstractPolicy, SymmetricCipher> >
+class CRYPTOPP_NO_VTABLE CFB_EncryptionTemplate : public CFB_CipherTemplate<BASE>
+{
+ bool IsForwardTransformation() const {return true;}
+ void CombineMessageAndShiftRegister(byte *output, byte *reg, const byte *message, size_t length);
+};
+
+template <class BASE = AbstractPolicyHolder<CFB_CipherAbstractPolicy, SymmetricCipher> >
+class CRYPTOPP_NO_VTABLE CFB_DecryptionTemplate : public CFB_CipherTemplate<BASE>
+{
+ bool IsForwardTransformation() const {return false;}
+ void CombineMessageAndShiftRegister(byte *output, byte *reg, const byte *message, size_t length);
+};
+
+template <class BASE>
+class CFB_RequireFullDataBlocks : public BASE
+{
+public:
+ unsigned int MandatoryBlockSize() const {return this->OptimalBlockSize();}
+};
+
+//! _
+template <class BASE, class INFO = BASE>
+class SymmetricCipherFinal : public AlgorithmImpl<SimpleKeyingInterfaceImpl<BASE, INFO>, INFO>
+{
+public:
+ SymmetricCipherFinal() {}
+ SymmetricCipherFinal(const byte *key)
+ {this->SetKey(key, this->DEFAULT_KEYLENGTH);}
+ SymmetricCipherFinal(const byte *key, size_t length)
+ {this->SetKey(key, length);}
+ SymmetricCipherFinal(const byte *key, size_t length, const byte *iv)
+ {this->SetKeyWithIV(key, length, iv);}
+
+ Clonable * Clone() const {return static_cast<SymmetricCipher *>(new SymmetricCipherFinal<BASE, INFO>(*this));}
+};
+
+NAMESPACE_END
+
+#ifdef CRYPTOPP_MANUALLY_INSTANTIATE_TEMPLATES
+#include "strciphr.cpp"
+#endif
+
+NAMESPACE_BEGIN(CryptoPP)
+CRYPTOPP_DLL_TEMPLATE_CLASS AbstractPolicyHolder<AdditiveCipherAbstractPolicy, SymmetricCipher>;
+CRYPTOPP_DLL_TEMPLATE_CLASS AdditiveCipherTemplate<AbstractPolicyHolder<AdditiveCipherAbstractPolicy, SymmetricCipher> >;
+CRYPTOPP_DLL_TEMPLATE_CLASS CFB_CipherTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, SymmetricCipher> >;
+CRYPTOPP_DLL_TEMPLATE_CLASS CFB_EncryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, SymmetricCipher> >;
+CRYPTOPP_DLL_TEMPLATE_CLASS CFB_DecryptionTemplate<AbstractPolicyHolder<CFB_CipherAbstractPolicy, SymmetricCipher> >;
+NAMESPACE_END
+
+#endif