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# blumshub.h

    00001 #ifndef CRYPTOPP_BLUMSHUB_H
    00002 #define CRYPTOPP_BLUMSHUB_H
    00003
    00004 #include "modarith.h"
    00005
    00006 NAMESPACE_BEGIN(CryptoPP)
    00007
    00008 class BlumGoldwasserPublicKey;
    00009 class BlumGoldwasserPrivateKey;
    00010
    00011 //! BlumBlumShub without factorization of the modulus
    00012 class PublicBlumBlumShub : public RandomNumberGenerator,
    00013                                                    public StreamTransformation
    00014 {
    00015 public:
    00016         PublicBlumBlumShub(const Integer &n, const Integer &seed);
    00017
    00018         unsigned int GenerateBit();
    00019         byte GenerateByte();
    00020         void GenerateBlock(byte *output, size_t size);
    00021         void ProcessData(byte *outString, const byte *inString, size_t length);
    00022
    00023         bool IsSelfInverting() const {return true;}
    00024         bool IsForwardTransformation() const {return true;}
    00025
    00026 protected:
    00027         ModularArithmetic modn;
    00028         word maxBits, bitsLeft;
    00029         Integer current;
    00030
    00031         friend class BlumGoldwasserPublicKey;
    00032         friend class BlumGoldwasserPrivateKey;
    00033 };
    00034
    00035 //! BlumBlumShub with factorization of the modulus
    00036 class BlumBlumShub : public PublicBlumBlumShub
    00037 {
    00038 public:
    00039         // Make sure p and q are both primes congruent to 3 mod 4 and at least 512 bits long,
    00040         // seed is the secret key and should be about as big as p*q
    00041         BlumBlumShub(const Integer &p, const Integer &q, const Integer &seed);
    00042
    00043         bool IsRandomAccess() const {return true;}
    00044         void Seek(lword index);
    00045
    00046 protected:
    00047         const Integer p, q;
    00048         const Integer x0;
    00049 };
    00050
    00051 NAMESPACE_END
    00052
    00053 #endif