NistP256.cs

using System.Numerics;
 
namespace Waher.Security.EllipticCurves
{
    public class NistP256 : NistPrimeCurve
    {
        private static readonly BigInteger p0 = BigInteger.Pow(2, 256) - BigInteger.Pow(2, 224) + BigInteger.Pow(2, 192) + BigInteger.Pow(2, 96) - 1;
        private static readonly BigInteger n0 = BigInteger.Parse("115792089210356248762697446949407573529996955224135760342422259061068512044369");
        private static readonly BigInteger B0 = ToBigInteger(new uint[]
        {
            0x5ac635d8, 0xaa3a93e7, 0xb3ebbd55, 0x769886bc, 0x651d06b0, 0xcc53b0f6, 
            0x3bce3c3e, 0x27d2604b
        });
        private static readonly BigInteger BasePointX = ToBigInteger(new uint[]
        {
            0x6b17d1f2, 0xe12c4247, 0xf8bce6e5, 0x63a440f2, 0x77037d81, 0x2deb33a0, 0xf4a13945, 0xd898c296
        });
        private static readonly BigInteger BasePointY = ToBigInteger(new uint[]
        {
            0x4fe342e2, 0xfe1a7f9b, 0x8ee7eb4a, 0x7c0f9e16, 0x2bce3357, 0x6b315ece, 0xcbb64068, 0x37bf51f5
        });
 
        public NistP256()
            : base(p0, new PointOnCurve(BasePointX, BasePointY), B0, n0)
        {
        }
 
        public NistP256(byte[] Secret)
            : base(p0, new PointOnCurve(BasePointX, BasePointY), B0, n0, Secret)
        {
        }
 
        public override string CurveName => "NIST P-256";
    }
}