mirror of
https://github.com/shadps4-emu/ext-cryptopp.git
synced 2024-11-23 18:09:48 +00:00
138 lines
3.3 KiB
C++
138 lines
3.3 KiB
C++
// lubyrack.h - originally written and placed in the public domain by Wei Dai
|
|
|
|
/// \file lubyrack.h
|
|
/// \brief Classes for the Luby-Rackoff block cipher
|
|
|
|
#ifndef CRYPTOPP_LUBYRACK_H
|
|
#define CRYPTOPP_LUBYRACK_H
|
|
|
|
#include "simple.h"
|
|
#include "secblock.h"
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
|
|
/// \brief Luby-Rackoff block cipher information
|
|
template <class T>
|
|
struct LR_Info : public VariableKeyLength<16, 0, 2*(INT_MAX/2), 2>, public FixedBlockSize<2*T::DIGESTSIZE>
|
|
{
|
|
static std::string StaticAlgorithmName() {return std::string("LR/")+T::StaticAlgorithmName();}
|
|
};
|
|
|
|
/// \brief Luby-Rackoff block cipher
|
|
template <class T>
|
|
class LR : public LR_Info<T>, public BlockCipherDocumentation
|
|
{
|
|
class CRYPTOPP_NO_VTABLE Base : public BlockCipherImpl<LR_Info<T> >
|
|
{
|
|
public:
|
|
// VC60 workaround: have to define these functions within class definition
|
|
void UncheckedSetKey(const byte *userKey, unsigned int length, const NameValuePairs ¶ms)
|
|
{
|
|
this->AssertValidKeyLength(length);
|
|
|
|
L = length/2;
|
|
buffer.New(2*S);
|
|
digest.New(S);
|
|
key.Assign(userKey, 2*L);
|
|
}
|
|
|
|
protected:
|
|
CRYPTOPP_CONSTANT(S=T::DIGESTSIZE)
|
|
unsigned int L; // key length / 2
|
|
SecByteBlock key;
|
|
|
|
mutable T hm;
|
|
mutable SecByteBlock buffer, digest;
|
|
};
|
|
|
|
class CRYPTOPP_NO_VTABLE Enc : public Base
|
|
{
|
|
public:
|
|
|
|
#define KL this->key
|
|
#define KR this->key+this->L
|
|
#define BL this->buffer
|
|
#define BR this->buffer+this->S
|
|
#define IL inBlock
|
|
#define IR inBlock+this->S
|
|
#define OL outBlock
|
|
#define OR outBlock+this->S
|
|
|
|
void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
|
|
{
|
|
this->hm.Update(KL, this->L);
|
|
this->hm.Update(IL, this->S);
|
|
this->hm.Final(BR);
|
|
xorbuf(BR, IR, this->S);
|
|
|
|
this->hm.Update(KR, this->L);
|
|
this->hm.Update(BR, this->S);
|
|
this->hm.Final(BL);
|
|
xorbuf(BL, IL, this->S);
|
|
|
|
this->hm.Update(KL, this->L);
|
|
this->hm.Update(BL, this->S);
|
|
this->hm.Final(this->digest);
|
|
xorbuf(BR, this->digest, this->S);
|
|
|
|
this->hm.Update(KR, this->L);
|
|
this->hm.Update(OR, this->S);
|
|
this->hm.Final(this->digest);
|
|
xorbuf(BL, this->digest, this->S);
|
|
|
|
if (xorBlock)
|
|
xorbuf(outBlock, xorBlock, this->buffer, 2*this->S);
|
|
else
|
|
memcpy_s(outBlock, 2*this->S, this->buffer, 2*this->S);
|
|
}
|
|
};
|
|
|
|
class CRYPTOPP_NO_VTABLE Dec : public Base
|
|
{
|
|
public:
|
|
void ProcessAndXorBlock(const byte *inBlock, const byte *xorBlock, byte *outBlock) const
|
|
{
|
|
this->hm.Update(KR, this->L);
|
|
this->hm.Update(IR, this->S);
|
|
this->hm.Final(BL);
|
|
xorbuf(BL, IL, this->S);
|
|
|
|
this->hm.Update(KL, this->L);
|
|
this->hm.Update(BL, this->S);
|
|
this->hm.Final(BR);
|
|
xorbuf(BR, IR, this->S);
|
|
|
|
this->hm.Update(KR, this->L);
|
|
this->hm.Update(BR, this->S);
|
|
this->hm.Final(this->digest);
|
|
xorbuf(BL, this->digest, this->S);
|
|
|
|
this->hm.Update(KL, this->L);
|
|
this->hm.Update(OL, this->S);
|
|
this->hm.Final(this->digest);
|
|
xorbuf(BR, this->digest, this->S);
|
|
|
|
if (xorBlock)
|
|
xorbuf(outBlock, xorBlock, this->buffer, 2*this->S);
|
|
else
|
|
memcpy(outBlock, this->buffer, 2*this->S);
|
|
}
|
|
#undef KL
|
|
#undef KR
|
|
#undef BL
|
|
#undef BR
|
|
#undef IL
|
|
#undef IR
|
|
#undef OL
|
|
#undef OR
|
|
};
|
|
|
|
public:
|
|
typedef BlockCipherFinal<ENCRYPTION, Enc> Encryption;
|
|
typedef BlockCipherFinal<DECRYPTION, Dec> Decryption;
|
|
};
|
|
|
|
NAMESPACE_END
|
|
|
|
#endif
|