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git-svn-id: svn://svn.code.sf.net/p/cryptopp/code/trunk/c5@2 57ff6487-cd31-0410-9ec3-f628ee90f5f0

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+#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) {}
+
+	byte GenerateByte();
+
+	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 X917RNG : public RandomNumberGenerator
+{
+public:
+	// cipher will be deleted by destructor
+	X917RNG(BlockTransformation *cipher, const byte *seed);
+
+	byte GenerateByte();
+
+private:
+	member_ptr<BlockTransformation> cipher;
+	const int S;			// blocksize of cipher
+	SecByteBlock dtbuf; 	// buffer for enciphered timestamp
+	SecByteBlock randseed, randbuf;
+	int randbuf_counter;	// # of unused bytes left in randbuf
+};
+
+/** 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 Sink
+{
+public:
+	MaurerRandomnessTest();
+
+	void Put(byte inByte);
+	void Put(const byte *inString, unsigned int length);
+
+	// 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