1HEADmaster

1 files changed, 63 insertions, 0 deletions

diff --git a/external/crypto++-5.6.3/blumshub.h b/external/crypto++-5.6.3/blumshub.h
new file mode 100644
index 0000000..b82c5bb
--- /dev/null
+++ b/external/crypto++-5.6.3/blumshub.h
@@ -0,0 +1,63 @@
+// blumshub.h - written and placed in the public domain by Wei Dai
+
+//! \file
+//! \headerfile blumshub.h
+//! \brief Classes for Blum Blum Shub generator
+
+#ifndef CRYPTOPP_BLUMSHUB_H
+#define CRYPTOPP_BLUMSHUB_H
+
+#include "cryptlib.h"
+#include "modarith.h"
+#include "integer.h"
+
+NAMESPACE_BEGIN(CryptoPP)
+
+//! BlumBlumShub without factorization of the modulus
+class PublicBlumBlumShub : public RandomNumberGenerator,
+						   public StreamTransformation
+{
+public:
+	PublicBlumBlumShub(const Integer &n, const Integer &seed);
+
+	unsigned int GenerateBit();
+	byte GenerateByte();
+	void GenerateBlock(byte *output, size_t size);
+	void ProcessData(byte *outString, const byte *inString, size_t length);
+
+	bool IsSelfInverting() const {return true;}
+	bool IsForwardTransformation() const {return true;}
+	
+#ifndef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY_562
+	virtual ~PublicBlumBlumShub() {}
+#endif
+
+protected:
+	ModularArithmetic modn;
+	Integer current;
+	word maxBits, bitsLeft;
+};
+
+//! BlumBlumShub with factorization of the modulus
+class BlumBlumShub : public PublicBlumBlumShub
+{
+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);
+	
+	bool IsRandomAccess() const {return true;}
+	void Seek(lword index);
+
+#ifndef CRYPTOPP_MAINTAIN_BACKWARDS_COMPATIBILITY_562
+	virtual ~BlumBlumShub() {}
+#endif
+
+protected:
+	const Integer p, q;
+	const Integer x0;
+};
+
+NAMESPACE_END
+
+#endif