blumshub.h

来自「各种加密算法的集合」· C头文件 代码 · 共 51 行

#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