1 files changed, 420 insertions, 0 deletions

diff --git a/CryptoPP/integer.h b/CryptoPP/integer.h
new file mode 100644
index 000000000..6d844fa57
--- /dev/null
+++ b/CryptoPP/integer.h
@@ -0,0 +1,420 @@
+#ifndef CRYPTOPP_INTEGER_H
+#define CRYPTOPP_INTEGER_H
+
+/** \file */
+
+#include "cryptlib.h"
+#include "secblock.h"
+
+#include <iosfwd>
+#include <algorithm>
+
+NAMESPACE_BEGIN(CryptoPP)
+
+struct InitializeInteger	// used to initialize static variables
+{
+	InitializeInteger();
+};
+
+typedef SecBlock<word, AllocatorWithCleanup<word, CRYPTOPP_BOOL_X86> > IntegerSecBlock;
+
+//! multiple precision integer and basic arithmetics
+/*! This class can represent positive and negative integers
+	with absolute value less than (256**sizeof(word)) ** (256**sizeof(int)).
+	\nosubgrouping
+*/
+class CRYPTOPP_DLL Integer : private InitializeInteger, public ASN1Object
+{
+public:
+	//! \name ENUMS, EXCEPTIONS, and TYPEDEFS
+	//@{
+		//! division by zero exception
+		class DivideByZero : public Exception
+		{
+		public:
+			DivideByZero() : Exception(OTHER_ERROR, "Integer: division by zero") {}
+		};
+
+		//!
+		class RandomNumberNotFound : public Exception
+		{
+		public:
+			RandomNumberNotFound() : Exception(OTHER_ERROR, "Integer: no integer satisfies the given parameters") {}
+		};
+
+		//!
+		enum Sign {POSITIVE=0, NEGATIVE=1};
+
+		//!
+		enum Signedness {
+		//!
+			UNSIGNED,
+		//!
+			SIGNED};
+
+		//!
+		enum RandomNumberType {
+		//!
+			ANY,
+		//!
+			PRIME};
+	//@}
+
+	//! \name CREATORS
+	//@{
+		//! creates the zero integer
+		Integer();
+
+		//! copy constructor
+		Integer(const Integer& t);
+
+		//! convert from signed long
+		Integer(signed long value);
+
+		//! convert from lword
+		Integer(Sign s, lword value);
+
+		//! convert from two words
+		Integer(Sign s, word highWord, word lowWord);
+
+		//! convert from string
+		/*! str can be in base 2, 8, 10, or 16.  Base is determined by a
+			case insensitive suffix of 'h', 'o', or 'b'.  No suffix means base 10.
+		*/
+		explicit Integer(const char *str);
+		explicit Integer(const wchar_t *str);
+
+		//! convert from big-endian byte array
+		Integer(const byte *encodedInteger, size_t byteCount, Signedness s=UNSIGNED);
+
+		//! convert from big-endian form stored in a BufferedTransformation
+		Integer(BufferedTransformation &bt, size_t byteCount, Signedness s=UNSIGNED);
+
+		//! convert from BER encoded byte array stored in a BufferedTransformation object
+		explicit Integer(BufferedTransformation &bt);
+
+		//! create a random integer
+		/*! The random integer created is uniformly distributed over [0, 2**bitcount). */
+		Integer(RandomNumberGenerator &rng, size_t bitcount);
+
+		//! avoid calling constructors for these frequently used integers
+		static const Integer & CRYPTOPP_API Zero();
+		//! avoid calling constructors for these frequently used integers
+		static const Integer & CRYPTOPP_API One();
+		//! avoid calling constructors for these frequently used integers
+		static const Integer & CRYPTOPP_API Two();
+
+		//! create a random integer of special type
+		/*! Ideally, the random integer created should be uniformly distributed
+			over {x | min <= x <= max and x is of rnType and x % mod == equiv}.
+			However the actual distribution may not be uniform because sequential
+			search is used to find an appropriate number from a random starting
+			point.
+			May return (with very small probability) a pseudoprime when a prime
+			is requested and max > lastSmallPrime*lastSmallPrime (lastSmallPrime
+			is declared in nbtheory.h).
+			\throw RandomNumberNotFound if the set is empty.
+		*/
+		Integer(RandomNumberGenerator &rng, const Integer &min, const Integer &max, RandomNumberType rnType=ANY, const Integer &equiv=Zero(), const Integer &mod=One());
+
+		//! return the integer 2**e
+		static Integer CRYPTOPP_API Power2(size_t e);
+	//@}
+
+	//! \name ENCODE/DECODE
+	//@{
+		//! minimum number of bytes to encode this integer
+		/*! MinEncodedSize of 0 is 1 */
+		size_t MinEncodedSize(Signedness=UNSIGNED) const;
+		//! encode in big-endian format
+		/*! unsigned means encode absolute value, signed means encode two's complement if negative.
+			if outputLen < MinEncodedSize, the most significant bytes will be dropped
+			if outputLen > MinEncodedSize, the most significant bytes will be padded
+		*/
+		void Encode(byte *output, size_t outputLen, Signedness=UNSIGNED) const;
+		//!
+		void Encode(BufferedTransformation &bt, size_t outputLen, Signedness=UNSIGNED) const;
+
+		//! encode using Distinguished Encoding Rules, put result into a BufferedTransformation object
+		void DEREncode(BufferedTransformation &bt) const;
+
+		//! encode absolute value as big-endian octet string
+		void DEREncodeAsOctetString(BufferedTransformation &bt, size_t length) const;
+
+		//! encode absolute value in OpenPGP format, return length of output
+		size_t OpenPGPEncode(byte *output, size_t bufferSize) const;
+		//! encode absolute value in OpenPGP format, put result into a BufferedTransformation object
+		size_t OpenPGPEncode(BufferedTransformation &bt) const;
+
+		//!
+		void Decode(const byte *input, size_t inputLen, Signedness=UNSIGNED);
+		//! 
+		//* Precondition: bt.MaxRetrievable() >= inputLen
+		void Decode(BufferedTransformation &bt, size_t inputLen, Signedness=UNSIGNED);
+
+		//!
+		void BERDecode(const byte *input, size_t inputLen);
+		//!
+		void BERDecode(BufferedTransformation &bt);
+
+		//! decode nonnegative value as big-endian octet string
+		void BERDecodeAsOctetString(BufferedTransformation &bt, size_t length);
+
+		class OpenPGPDecodeErr : public Exception
+		{
+		public: 
+			OpenPGPDecodeErr() : Exception(INVALID_DATA_FORMAT, "OpenPGP decode error") {}
+		};
+
+		//!
+		void OpenPGPDecode(const byte *input, size_t inputLen);
+		//!
+		void OpenPGPDecode(BufferedTransformation &bt);
+	//@}
+
+	//! \name ACCESSORS
+	//@{
+		//! return true if *this can be represented as a signed long
+		bool IsConvertableToLong() const;
+		//! return equivalent signed long if possible, otherwise undefined
+		signed long ConvertToLong() const;
+
+		//! number of significant bits = floor(log2(abs(*this))) + 1
+		unsigned int BitCount() const;
+		//! number of significant bytes = ceiling(BitCount()/8)
+		unsigned int ByteCount() const;
+		//! number of significant words = ceiling(ByteCount()/sizeof(word))
+		unsigned int WordCount() const;
+
+		//! return the i-th bit, i=0 being the least significant bit
+		bool GetBit(size_t i) const;
+		//! return the i-th byte
+		byte GetByte(size_t i) const;
+		//! return n lowest bits of *this >> i
+		lword GetBits(size_t i, size_t n) const;
+
+		//!
+		bool IsZero() const {return !*this;}
+		//!
+		bool NotZero() const {return !IsZero();}
+		//!
+		bool IsNegative() const {return sign == NEGATIVE;}
+		//!
+		bool NotNegative() const {return !IsNegative();}
+		//!
+		bool IsPositive() const {return NotNegative() && NotZero();}
+		//!
+		bool NotPositive() const {return !IsPositive();}
+		//!
+		bool IsEven() const {return GetBit(0) == 0;}
+		//!
+		bool IsOdd() const	{return GetBit(0) == 1;}
+	//@}
+
+	//! \name MANIPULATORS
+	//@{
+		//!
+		Integer&  operator=(const Integer& t);
+
+		//!
+		Integer&  operator+=(const Integer& t);
+		//!
+		Integer&  operator-=(const Integer& t);
+		//!
+		Integer&  operator*=(const Integer& t)	{return *this = Times(t);}
+		//!
+		Integer&  operator/=(const Integer& t)	{return *this = DividedBy(t);}
+		//!
+		Integer&  operator%=(const Integer& t)	{return *this = Modulo(t);}
+		//!
+		Integer&  operator/=(word t)  {return *this = DividedBy(t);}
+		//!
+		Integer&  operator%=(word t)  {return *this = Integer(POSITIVE, 0, Modulo(t));}
+
+		//!
+		Integer&  operator<<=(size_t);
+		//!
+		Integer&  operator>>=(size_t);
+
+		//!
+		void Randomize(RandomNumberGenerator &rng, size_t bitcount);
+		//!
+		void Randomize(RandomNumberGenerator &rng, const Integer &min, const Integer &max);
+		//! set this Integer to a random element of {x | min <= x <= max and x is of rnType and x % mod == equiv}
+		/*! returns false if the set is empty */
+		bool Randomize(RandomNumberGenerator &rng, const Integer &min, const Integer &max, RandomNumberType rnType, const Integer &equiv=Zero(), const Integer &mod=One());
+
+		bool GenerateRandomNoThrow(RandomNumberGenerator &rng, const NameValuePairs &params = g_nullNameValuePairs);
+		void GenerateRandom(RandomNumberGenerator &rng, const NameValuePairs &params = g_nullNameValuePairs)
+		{
+			if (!GenerateRandomNoThrow(rng, params))
+				throw RandomNumberNotFound();
+		}
+
+		//! set the n-th bit to value
+		void SetBit(size_t n, bool value=1);
+		//! set the n-th byte to value
+		void SetByte(size_t n, byte value);
+
+		//!
+		void Negate();
+		//!
+		void SetPositive() {sign = POSITIVE;}
+		//!
+		void SetNegative() {if (!!(*this)) sign = NEGATIVE;}
+
+		//!
+		void swap(Integer &a);
+	//@}
+
+	//! \name UNARY OPERATORS
+	//@{
+		//!
+		bool		operator!() const;
+		//!
+		Integer 	operator+() const {return *this;}
+		//!
+		Integer 	operator-() const;
+		//!
+		Integer&	operator++();
+		//!
+		Integer&	operator--();
+		//!
+		Integer 	operator++(int) {Integer temp = *this; ++*this; return temp;}
+		//!
+		Integer 	operator--(int) {Integer temp = *this; --*this; return temp;}
+	//@}
+
+	//! \name BINARY OPERATORS
+	//@{
+		//! signed comparison
+		/*! \retval -1 if *this < a
+			\retval  0 if *this = a
+			\retval  1 if *this > a
+		*/
+		int Compare(const Integer& a) const;
+
+		//!
+		Integer Plus(const Integer &b) const;
+		//!
+		Integer Minus(const Integer &b) const;
+		//!
+		Integer Times(const Integer &b) const;
+		//!
+		Integer DividedBy(const Integer &b) const;
+		//!
+		Integer Modulo(const Integer &b) const;
+		//!
+		Integer DividedBy(word b) const;
+		//!
+		word Modulo(word b) const;
+
+		//!
+		Integer operator>>(size_t n) const	{return Integer(*this)>>=n;}
+		//!
+		Integer operator<<(size_t n) const	{return Integer(*this)<<=n;}
+	//@}
+
+	//! \name OTHER ARITHMETIC FUNCTIONS
+	//@{
+		//!
+		Integer AbsoluteValue() const;
+		//!
+		Integer Doubled() const {return Plus(*this);}
+		//!
+		Integer Squared() const {return Times(*this);}
+		//! extract square root, if negative return 0, else return floor of square root
+		Integer SquareRoot() const;
+		//! return whether this integer is a perfect square
+		bool IsSquare() const;
+
+		//! is 1 or -1
+		bool IsUnit() const;
+		//! return inverse if 1 or -1, otherwise return 0
+		Integer MultiplicativeInverse() const;
+
+		//! modular multiplication
+		CRYPTOPP_DLL friend Integer CRYPTOPP_API a_times_b_mod_c(const Integer &x, const Integer& y, const Integer& m);
+		//! modular exponentiation
+		CRYPTOPP_DLL friend Integer CRYPTOPP_API a_exp_b_mod_c(const Integer &x, const Integer& e, const Integer& m);
+
+		//! calculate r and q such that (a == d*q + r) && (0 <= r < abs(d))
+		static void CRYPTOPP_API Divide(Integer &r, Integer &q, const Integer &a, const Integer &d);
+		//! use a faster division algorithm when divisor is short
+		static void CRYPTOPP_API Divide(word &r, Integer &q, const Integer &a, word d);
+
+		//! returns same result as Divide(r, q, a, Power2(n)), but faster
+		static void CRYPTOPP_API DivideByPowerOf2(Integer &r, Integer &q, const Integer &a, unsigned int n);
+
+		//! greatest common divisor
+		static Integer CRYPTOPP_API Gcd(const Integer &a, const Integer &n);
+		//! calculate multiplicative inverse of *this mod n
+		Integer InverseMod(const Integer &n) const;
+		//!
+		word InverseMod(word n) const;
+	//@}
+
+	//! \name INPUT/OUTPUT
+	//@{
+		//!
+		friend CRYPTOPP_DLL std::istream& CRYPTOPP_API operator>>(std::istream& in, Integer &a);
+		//!
+		friend CRYPTOPP_DLL std::ostream& CRYPTOPP_API operator<<(std::ostream& out, const Integer &a);
+	//@}
+
+private:
+	friend class ModularArithmetic;
+	friend class MontgomeryRepresentation;
+	friend class HalfMontgomeryRepresentation;
+
+	Integer(word value, size_t length);
+
+	int PositiveCompare(const Integer &t) const;
+	friend void PositiveAdd(Integer &sum, const Integer &a, const Integer &b);
+	friend void PositiveSubtract(Integer &diff, const Integer &a, const Integer &b);
+	friend void PositiveMultiply(Integer &product, const Integer &a, const Integer &b);
+	friend void PositiveDivide(Integer &remainder, Integer &quotient, const Integer &dividend, const Integer &divisor);
+
+	IntegerSecBlock reg;
+	Sign sign;
+};
+
+//!
+inline bool operator==(const CryptoPP::Integer& a, const CryptoPP::Integer& b) {return a.Compare(b)==0;}
+//!
+inline bool operator!=(const CryptoPP::Integer& a, const CryptoPP::Integer& b) {return a.Compare(b)!=0;}
+//!
+inline bool operator> (const CryptoPP::Integer& a, const CryptoPP::Integer& b) {return a.Compare(b)> 0;}
+//!
+inline bool operator>=(const CryptoPP::Integer& a, const CryptoPP::Integer& b) {return a.Compare(b)>=0;}
+//!
+inline bool operator< (const CryptoPP::Integer& a, const CryptoPP::Integer& b) {return a.Compare(b)< 0;}
+//!
+inline bool operator<=(const CryptoPP::Integer& a, const CryptoPP::Integer& b) {return a.Compare(b)<=0;}
+//!
+inline CryptoPP::Integer operator+(const CryptoPP::Integer &a, const CryptoPP::Integer &b) {return a.Plus(b);}
+//!
+inline CryptoPP::Integer operator-(const CryptoPP::Integer &a, const CryptoPP::Integer &b) {return a.Minus(b);}
+//!
+inline CryptoPP::Integer operator*(const CryptoPP::Integer &a, const CryptoPP::Integer &b) {return a.Times(b);}
+//!
+inline CryptoPP::Integer operator/(const CryptoPP::Integer &a, const CryptoPP::Integer &b) {return a.DividedBy(b);}
+//!
+inline CryptoPP::Integer operator%(const CryptoPP::Integer &a, const CryptoPP::Integer &b) {return a.Modulo(b);}
+//!
+inline CryptoPP::Integer operator/(const CryptoPP::Integer &a, CryptoPP::word b) {return a.DividedBy(b);}
+//!
+inline CryptoPP::word    operator%(const CryptoPP::Integer &a, CryptoPP::word b) {return a.Modulo(b);}
+
+NAMESPACE_END
+
+#ifndef __BORLANDC__
+NAMESPACE_BEGIN(std)
+inline void swap(CryptoPP::Integer &a, CryptoPP::Integer &b)
+{
+	a.swap(b);
+}
+NAMESPACE_END
+#endif
+
+#endif