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63 lines
1.5 KiB
63 lines
1.5 KiB
// blumshub.h - written and placed in the public domain by Wei Dai |
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//! \file |
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//! \headerfile blumshub.h |
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//! \brief Classes for Blum Blum Shub generator |
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#ifndef CRYPTOPP_BLUMSHUB_H |
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#define CRYPTOPP_BLUMSHUB_H |
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#include "cryptlib.h" |
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#include "modarith.h" |
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#include "integer.h" |
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NAMESPACE_BEGIN(CryptoPP) |
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//! BlumBlumShub without factorization of the modulus |
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class PublicBlumBlumShub : public RandomNumberGenerator, |
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public StreamTransformation |
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{ |
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public: |
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PublicBlumBlumShub(const Integer &n, const Integer &seed); |
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unsigned int GenerateBit(); |
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byte GenerateByte(); |
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void GenerateBlock(byte *output, size_t size); |
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void ProcessData(byte *outString, const byte *inString, size_t length); |
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bool IsSelfInverting() const {return true;} |
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bool IsForwardTransformation() const {return true;} |
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#ifndef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY_562 |
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virtual ~PublicBlumBlumShub() {} |
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#endif |
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protected: |
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ModularArithmetic modn; |
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Integer current; |
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word maxBits, bitsLeft; |
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}; |
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//! BlumBlumShub with factorization of the modulus |
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class BlumBlumShub : public PublicBlumBlumShub |
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{ |
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public: |
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// Make sure p and q are both primes congruent to 3 mod 4 and at least 512 bits long, |
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// seed is the secret key and should be about as big as p*q |
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BlumBlumShub(const Integer &p, const Integer &q, const Integer &seed); |
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bool IsRandomAccess() const {return true;} |
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void Seek(lword index); |
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#ifndef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY_562 |
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virtual ~BlumBlumShub() {} |
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#endif |
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protected: |
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const Integer p, q; |
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const Integer x0; |
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}; |
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NAMESPACE_END |
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#endif
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