mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-11-23 18:09:48 +00:00
326 lines
13 KiB
C++
326 lines
13 KiB
C++
/*! \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 "config.h"
|
|
|
|
#if CRYPTOPP_MSC_VERSION
|
|
# pragma warning(push)
|
|
# pragma warning(disable: 4127 4189)
|
|
#endif
|
|
|
|
#include "cryptlib.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)
|
|
{CRYPTOPP_UNUSED(operation); CRYPTOPP_UNUSED(output); CRYPTOPP_UNUSED(input); CRYPTOPP_UNUSED(iterationCount); assert(false);}
|
|
virtual void CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length) =0;
|
|
virtual void CipherResynchronize(byte *keystreamBuffer, const byte *iv, size_t length)
|
|
{CRYPTOPP_UNUSED(keystreamBuffer); CRYPTOPP_UNUSED(iv); CRYPTOPP_UNUSED(length); throw NotImplemented("SimpleKeyingInterface: this object doesn't support resynchronization");}
|
|
virtual bool CipherIsRandomAccess() const =0;
|
|
virtual void SeekToIteration(lword iterationCount)
|
|
{CRYPTOPP_UNUSED(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 ¶ms);
|
|
|
|
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)
|
|
{CRYPTOPP_UNUSED(output); CRYPTOPP_UNUSED(input); CRYPTOPP_UNUSED(dir); CRYPTOPP_UNUSED(iterationCount);
|
|
assert(false); /*throw 0;*/ throw Exception(Exception::OTHER_ERROR, "SimpleKeyingInterface: unexpected error");}
|
|
virtual void CipherSetKey(const NameValuePairs ¶ms, const byte *key, size_t length) =0;
|
|
virtual void CipherResynchronize(const byte *iv, size_t length)
|
|
{CRYPTOPP_UNUSED(iv); CRYPTOPP_UNUSED(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 ®isterWord)
|
|
{
|
|
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 ¶ms);
|
|
|
|
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
|
|
|
|
#if CRYPTOPP_MSC_VERSION
|
|
# pragma warning(pop)
|
|
#endif
|
|
|
|
#endif
|