コード例 #1
0
        /// <summary>
        /// Runs the EEA on two BigIntegers
        /// </summary>
        /// <param name="A">Quotient A</param>
        /// <param name="B">Quotient B</param>
        /// <returns>Return a BigIntEuclidean object that contains the result in the variables X, Y, and GCD</returns>
        /// 
        /// <remarks>
        /// Implemented from pseudocode on <a href="http://en.wikipedia.org/wiki/Extended_Euclidean_algorithm"/>Wikipedia
        /// </remarks>
        public static BigIntEuclidean Calculate(BigInteger A, BigInteger B)
        {
            BigInteger x = BigInteger.Zero;
            BigInteger lastX = BigInteger.One;
            BigInteger y = BigInteger.One;
            BigInteger lastY = BigInteger.Zero;

            while (!B.Equals(BigInteger.Zero))
            {
                BigInteger[] quotientAndRemainder = A.DivideAndRemainder(B);
                BigInteger quotient = quotientAndRemainder[0];
                BigInteger temp = A;

                A = B;
                B = quotientAndRemainder[1];

                temp = x;
                x = lastX.Subtract(quotient.Multiply(x));
                lastX = temp;

                temp = y;
                y = lastY.Subtract(quotient.Multiply(y));
                lastY = temp;
            }

            BigIntEuclidean result = new BigIntEuclidean();
            result.X = lastX;
            result.Y = lastY;
            result.GCD = A;

            return result;
        }
コード例 #2
0
        /// <summary>
        /// Runs the EEA on two BigIntegers
        /// </summary>
        /// <param name="A">Quotient A</param>
        /// <param name="B">Quotient B</param>
        /// <returns>Return a BigIntEuclidean object that contains the result in the variables X, Y, and GCD</returns>
        ///
        /// <remarks>
        /// Implemented from pseudocode on <a href="http://en.wikipedia.org/wiki/Extended_Euclidean_algorithm"/>Wikipedia
        /// </remarks>
        public static BigIntEuclidean Calculate(BigInteger A, BigInteger B)
        {
            BigInteger x     = BigInteger.Zero;
            BigInteger lastX = BigInteger.One;
            BigInteger y     = BigInteger.One;
            BigInteger lastY = BigInteger.Zero;

            while (!B.Equals(BigInteger.Zero))
            {
                BigInteger[] quotientAndRemainder = A.DivideAndRemainder(B);
                BigInteger   quotient             = quotientAndRemainder[0];
                BigInteger   temp = A;

                A = B;
                B = quotientAndRemainder[1];

                temp  = x;
                x     = lastX.Subtract(quotient.Multiply(x));
                lastX = temp;

                temp  = y;
                y     = lastY.Subtract(quotient.Multiply(y));
                lastY = temp;
            }

            BigIntEuclidean result = new BigIntEuclidean();

            result.X   = lastX;
            result.Y   = lastY;
            result.GCD = A;

            return(result);
        }