|
|
|
|
#ifndef CRYPTOPP_BLUMSHUB_H
|
|
|
|
|
#define CRYPTOPP_BLUMSHUB_H
|
|
|
|
|
|
|
|
|
|
#include "modarith.h"
|
|
|
|
|
|
|
|
|
|
NAMESPACE_BEGIN(CryptoPP)
|
|
|
|
|
|
|
|
|
|
class BlumGoldwasserPublicKey;
|
|
|
|
|
class BlumGoldwasserPrivateKey;
|
|
|
|
|
|
|
|
|
|
//! BlumBlumShub without factorization of the modulus
|
|
|
|
|
class PublicBlumBlumShub : public RandomNumberGenerator,
|
|
|
|
|
public StreamTransformation
|
|
|
|
|
{
|
|
|
|
|
public:
|
|
|
|
|
PublicBlumBlumShub(const Integer &n, const Integer &seed);
|
|
|
|
|
|
|
|
|
|
unsigned int GenerateBit();
|
|
|
|
|
byte GenerateByte();
|
|
|
|
|
void GenerateBlock(byte *output, size_t size);
|
|
|
|
|
void ProcessData(byte *outString, const byte *inString, size_t length);
|
|
|
|
|
|
|
|
|
|
bool IsSelfInverting() const {return true;}
|
|
|
|
|
bool IsForwardTransformation() const {return true;}
|
|
|
|
|
|
|
|
|
|
protected:
|
|
|
|
|
ModularArithmetic modn;
|
|
|
|
|
word maxBits, bitsLeft;
|
|
|
|
|
Integer current;
|
|
|
|
|
|
|
|
|
|
friend class BlumGoldwasserPublicKey;
|
|
|
|
|
friend class BlumGoldwasserPrivateKey;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
//! BlumBlumShub with factorization of the modulus
|
|
|
|
|
class BlumBlumShub : public PublicBlumBlumShub
|
|
|
|
|
{
|
|
|
|
|
public:
|
|
|
|
|
// Make sure p and q are both primes congruent to 3 mod 4 and at least 512 bits long,
|
|
|
|
|
// seed is the secret key and should be about as big as p*q
|
|
|
|
|
BlumBlumShub(const Integer &p, const Integer &q, const Integer &seed);
|
|
|
|
|
|
|
|
|
|
bool IsRandomAccess() const {return true;}
|
|
|
|
|
void Seek(lword index);
|
|
|
|
|
|
|
|
|
|
protected:
|
|
|
|
|
const Integer p, q;
|
|
|
|
|
const Integer x0;
|
|
|
|
|
};
|
|
|
|
|
|
|
|
|
|
NAMESPACE_END
|
|
|
|
|
|
|
|
|
|
#endif
|
