From 3438e5d3ddf8444f0e31009ffbe8237ef3752c22 Mon Sep 17 00:00:00 2001 From: Alexander Harkness Date: Sun, 24 Nov 2013 14:21:13 +0000 Subject: move cryptopp into lib --- lib/cryptopp/rng.h | 77 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 lib/cryptopp/rng.h (limited to 'lib/cryptopp/rng.h') diff --git a/lib/cryptopp/rng.h b/lib/cryptopp/rng.h new file mode 100644 index 000000000..2439dee69 --- /dev/null +++ b/lib/cryptopp/rng.h @@ -0,0 +1,77 @@ +// rng.h - misc RNG related classes, see also osrng.h, randpool.h + +#ifndef CRYPTOPP_RNG_H +#define CRYPTOPP_RNG_H + +#include "cryptlib.h" +#include "filters.h" + +NAMESPACE_BEGIN(CryptoPP) + +//! linear congruential generator +/*! originally by William S. England, do not use for cryptographic purposes */ +class LC_RNG : public RandomNumberGenerator +{ +public: + LC_RNG(word32 init_seed) + : seed(init_seed) {} + + void GenerateBlock(byte *output, size_t size); + + word32 GetSeed() {return seed;} + +private: + word32 seed; + + static const word32 m; + static const word32 q; + static const word16 a; + static const word16 r; +}; + +//! RNG derived from ANSI X9.17 Appendix C + +class CRYPTOPP_DLL X917RNG : public RandomNumberGenerator, public NotCopyable +{ +public: + // cipher will be deleted by destructor, deterministicTimeVector = 0 means obtain time vector from system + X917RNG(BlockTransformation *cipher, const byte *seed, const byte *deterministicTimeVector = 0); + + void GenerateIntoBufferedTransformation(BufferedTransformation &target, const std::string &channel, lword size); + +private: + member_ptr cipher; + unsigned int S; // blocksize of cipher + SecByteBlock dtbuf; // buffer for enciphered timestamp + SecByteBlock randseed, m_lastBlock, m_deterministicTimeVector; +}; + +/** This class implements Maurer's Universal Statistical Test for Random Bit Generators + it is intended for measuring the randomness of *PHYSICAL* RNGs. + For more details see his paper in Journal of Cryptology, 1992. */ + +class MaurerRandomnessTest : public Bufferless +{ +public: + MaurerRandomnessTest(); + + size_t Put2(const byte *inString, size_t length, int messageEnd, bool blocking); + + // BytesNeeded() returns how many more bytes of input is needed by the test + // GetTestValue() should not be called before BytesNeeded()==0 + unsigned int BytesNeeded() const {return n >= (Q+K) ? 0 : Q+K-n;} + + // returns a number between 0.0 and 1.0, describing the quality of the + // random numbers entered + double GetTestValue() const; + +private: + enum {L=8, V=256, Q=2000, K=2000}; + double sum; + unsigned int n; + unsigned int tab[V]; +}; + +NAMESPACE_END + +#endif -- cgit v1.2.3