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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