mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-11-24 02:19:41 +00:00
81b1a18063
We have made a fair number of changes, and we don't want WD to receive credit for issues he was not part of
80 lines
2.4 KiB
C++
80 lines
2.4 KiB
C++
// mdc.h - originally written and placed in the public domain by Wei Dai
|
|
|
|
#ifndef CRYPTOPP_MDC_H
|
|
#define CRYPTOPP_MDC_H
|
|
|
|
//! \file mdc.h
|
|
//! \brief Classes for the MDC message digest
|
|
|
|
#include "seckey.h"
|
|
#include "secblock.h"
|
|
#include "misc.h"
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
|
|
//! \class MDC_Info
|
|
//! \brief MDC_Info cipher information
|
|
template <class T>
|
|
struct MDC_Info : public FixedBlockSize<T::DIGESTSIZE>, public FixedKeyLength<T::BLOCKSIZE>
|
|
{
|
|
static std::string StaticAlgorithmName() {return std::string("MDC/")+T::StaticAlgorithmName();}
|
|
};
|
|
|
|
|
|
//! \class MDC
|
|
//! \brief MDC cipher
|
|
//! \details MDC() is a construction by Peter Gutmann to turn an iterated hash function into a PRF
|
|
//! \sa <a href="http://www.weidai.com/scan-mirror/cs.html#MDC">MDC</a>
|
|
template <class T>
|
|
class MDC : public MDC_Info<T>
|
|
{
|
|
//! \class Enc
|
|
//! \brief MDC cipher encryption operation
|
|
class CRYPTOPP_NO_VTABLE Enc : public BlockCipherImpl<MDC_Info<T> >
|
|
{
|
|
typedef typename T::HashWordType HashWordType;
|
|
|
|
public:
|
|
void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs ¶ms)
|
|
{
|
|
this->AssertValidKeyLength(length);
|
|
memcpy_s(m_key, m_key.size(), userKey, this->KEYLENGTH);
|
|
T::CorrectEndianess(Key(), Key(), this->KEYLENGTH);
|
|
}
|
|
|
|
void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
|
|
{
|
|
T::CorrectEndianess(Buffer(), (HashWordType *)inBlock, this->BLOCKSIZE);
|
|
T::Transform(Buffer(), Key());
|
|
if (xorBlock)
|
|
{
|
|
T::CorrectEndianess(Buffer(), Buffer(), this->BLOCKSIZE);
|
|
xorbuf(outBlock, xorBlock, m_buffer, this->BLOCKSIZE);
|
|
}
|
|
else
|
|
T::CorrectEndianess((HashWordType *)outBlock, Buffer(), this->BLOCKSIZE);
|
|
}
|
|
|
|
bool IsPermutation() const {return false;}
|
|
|
|
unsigned int OptimalDataAlignment() const {return sizeof(HashWordType);}
|
|
|
|
private:
|
|
HashWordType *Key() {return (HashWordType *)m_key.data();}
|
|
const HashWordType *Key() const {return (const HashWordType *)m_key.data();}
|
|
HashWordType *Buffer() const {return (HashWordType *)m_buffer.data();}
|
|
|
|
// VC60 workaround: bug triggered if using FixedSizeAllocatorWithCleanup
|
|
FixedSizeSecBlock<byte, MDC_Info<T>::KEYLENGTH, AllocatorWithCleanup<byte> > m_key;
|
|
mutable FixedSizeSecBlock<byte, MDC_Info<T>::BLOCKSIZE, AllocatorWithCleanup<byte> > m_buffer;
|
|
};
|
|
|
|
public:
|
|
//! use BlockCipher interface
|
|
typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
|
|
};
|
|
|
|
NAMESPACE_END
|
|
|
|
#endif
|