mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-11-24 02:19:41 +00:00
85 lines
2.7 KiB
C++
85 lines
2.7 KiB
C++
// mdc.h - originally written and placed in the public domain by Wei Dai
|
|
|
|
/// \file mdc.h
|
|
/// \brief Classes for the MDC message digest
|
|
|
|
#ifndef CRYPTOPP_MDC_H
|
|
#define CRYPTOPP_MDC_H
|
|
|
|
#include "seckey.h"
|
|
#include "secblock.h"
|
|
#include "misc.h"
|
|
|
|
// GCC cast warning
|
|
#define HashWordPtr(x) ((HashWordType*)(void*)(x))
|
|
#define ConstHashWordPtr(x) ((const HashWordType*)(const void*)(x))
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
|
|
/// \tparam B BlockCipher derived class
|
|
/// \brief MDC_Info cipher information
|
|
template <class B>
|
|
struct MDC_Info : public FixedBlockSize<B::DIGESTSIZE>, public FixedKeyLength<B::BLOCKSIZE>
|
|
{
|
|
static std::string StaticAlgorithmName() {return std::string("MDC/")+B::StaticAlgorithmName();}
|
|
};
|
|
|
|
/// \brief MDC cipher
|
|
/// \tparam H HashTransformation derived class
|
|
/// \details MDC() is a construction by Peter Gutmann to turn an iterated hash function into a PRF
|
|
/// \sa <a href="http://www.cryptopp.com/wiki/MDC">MDC</a>
|
|
template <class H>
|
|
class MDC : public MDC_Info<H>
|
|
{
|
|
/// \brief MDC cipher encryption operation
|
|
class CRYPTOPP_NO_VTABLE Enc : public BlockCipherImpl<MDC_Info<H> >
|
|
{
|
|
typedef typename H::HashWordType HashWordType;
|
|
|
|
public:
|
|
void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs ¶ms)
|
|
{
|
|
CRYPTOPP_UNUSED(params);
|
|
this->AssertValidKeyLength(length);
|
|
ConditionalByteReverse(BIG_ENDIAN_ORDER, Key(), ConstHashWordPtr(userKey), this->KEYLENGTH);
|
|
}
|
|
|
|
void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
|
|
{
|
|
ConditionalByteReverse(BIG_ENDIAN_ORDER, Buffer(), ConstHashWordPtr(inBlock), this->BLOCKSIZE);
|
|
H::Transform(Buffer(), Key());
|
|
|
|
if (xorBlock)
|
|
{
|
|
ConditionalByteReverse(BIG_ENDIAN_ORDER, Buffer(), Buffer(), this->BLOCKSIZE);
|
|
xorbuf(outBlock, xorBlock, m_buffer, this->BLOCKSIZE);
|
|
}
|
|
else
|
|
{
|
|
ConditionalByteReverse(BIG_ENDIAN_ORDER, HashWordPtr(outBlock), Buffer(), this->BLOCKSIZE);
|
|
}
|
|
}
|
|
|
|
bool IsPermutation() const {return false;}
|
|
|
|
unsigned int OptimalDataAlignment() const {return sizeof(HashWordType);}
|
|
|
|
private:
|
|
HashWordType *Key() {return HashWordPtr(m_key.data());}
|
|
const HashWordType *Key() const {return ConstHashWordPtr(m_key.data());}
|
|
HashWordType *Buffer() const {return HashWordPtr(m_buffer.data());}
|
|
|
|
// VC60 workaround: bug triggered if using FixedSizeAllocatorWithCleanup
|
|
FixedSizeSecBlock<byte, MDC_Info<H>::KEYLENGTH, AllocatorWithCleanup<byte> > m_key;
|
|
mutable FixedSizeSecBlock<byte, MDC_Info<H>::BLOCKSIZE, AllocatorWithCleanup<byte> > m_buffer;
|
|
};
|
|
|
|
public:
|
|
// use BlockCipher interface
|
|
typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
|
|
};
|
|
|
|
NAMESPACE_END
|
|
|
|
#endif
|