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// lubyrack.h - written and placed in the public domain by Wei Dai
#ifndef CRYPTOPP_LUBYRACK_H
#define CRYPTOPP_LUBYRACK_H
/** \file */
#include "simple.h"
#include "secblock.h"
NAMESPACE_BEGIN(CryptoPP)
template <class T> struct DigestSizeDoubleWorkaround {enum {RESULT = 2*T::DIGESTSIZE};}; // VC60 workaround
//! algorithm info
template <class T>
struct LR_Info : public VariableKeyLength<16, 0, 2*(UINT_MAX/2), 2>, public FixedBlockSize<DigestSizeDoubleWorkaround<T>::RESULT>
{
static std::string StaticAlgorithmName() {return std::string("LR/")+T::StaticAlgorithmName();}
};
//! Luby-Rackoff
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(CipherDir direction, const byte *userKey, unsigned int length)
{
this->AssertValidKeyLength(length);
L = length/2;
buffer.New(2*S);
digest.New(S);
key.Assign(userKey, 2*L);
}
protected:
enum {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(outBlock, 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
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