?? blumshub.h
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#ifndef CRYPTOPP_BLUMSHUB_H
#define CRYPTOPP_BLUMSHUB_H
#include "cryptlib.h"
#include "modarith.h"
NAMESPACE_BEGIN(CryptoPP)
class BlumGoldwasserPublicKey;
class BlumGoldwasserPrivateKey;
class PublicBlumBlumShub : public RandomNumberGenerator,
public virtual StreamCipher
{
public:
PublicBlumBlumShub(const Integer &n, const Integer &seed);
unsigned int GetBit();
byte GetByte();
byte ProcessByte(byte input)
{return (input ^ GetByte());}
protected:
const ModularArithmetic modn;
const int maxBits;
Integer current;
int bitsLeft;
friend BlumGoldwasserPublicKey;
friend BlumGoldwasserPrivateKey;
};
class BlumBlumShub : public PublicBlumBlumShub,
public RandomAccessStreamCipher
{
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);
void Seek(unsigned long index);
protected:
const Integer p, q;
const Integer x0;
};
NAMESPACE_END
#endif
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