Org.BouncyCastle.Math.BigInteger.Subtract C# (CSharp) 메소드

		public BigInteger Subtract(
			BigInteger n)
		{
			if (n.sign == 0)
				return this;

			if (this.sign == 0)
				return n.Negate();

			if (this.sign != n.sign)
				return Add(n.Negate());

			int compare = CompareNoLeadingZeroes(0, magnitude, 0, n.magnitude);
			if (compare == 0)
				return Zero;

			BigInteger bigun, lilun;
			if (compare < 0)
			{
				bigun = n;
				lilun = this;
			}
			else
			{
				bigun = this;
				lilun = n;
			}

			return new BigInteger(this.sign * compare, doSubBigLil(bigun.magnitude, lilun.magnitude), true);
		}

        /// <summary>Choose a random prime value for use with RSA</summary>
        /// <param name="bitlength">the bit-length of the returned prime</param>
        /// <param name="e">the RSA public exponent</param>
        /// <returns>a prime p, with (p-1) relatively prime to e</returns>
        protected virtual BigInteger ChooseRandomPrime(int bitlength, BigInteger e)
        {
            for (;;)
            {
                BigInteger p = new BigInteger(bitlength, 1, param.Random);

                if (p.Mod(e).Equals(BigInteger.One))
                    continue;

                if (!p.IsProbablePrime(param.Certainty))
                    continue;

                if (!e.Gcd(p.Subtract(BigInteger.One)).Equals(BigInteger.One))
                    continue;

                return p;
            }
        }