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Assets/BestHTTP/SecureProtocol/math/ec/custom/djb/Curve25519.cs

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+#if !BESTHTTP_DISABLE_ALTERNATE_SSL && (!UNITY_WEBGL || UNITY_EDITOR)
+
+using System;
+
+using Org.BouncyCastle.Math.Raw;
+using Org.BouncyCastle.Utilities.Encoders;
+
+namespace Org.BouncyCastle.Math.EC.Custom.Djb
+{
+    internal class Curve25519
+        : AbstractFpCurve
+    {
+        public static readonly BigInteger q = Nat256.ToBigInteger(Curve25519Field.P);
+
+        private const int Curve25519_DEFAULT_COORDS = COORD_JACOBIAN_MODIFIED;
+
+        protected readonly Curve25519Point m_infinity;
+
+        public Curve25519()
+            : base(q)
+        {
+            this.m_infinity = new Curve25519Point(this, null, null);
+
+            this.m_a = FromBigInteger(new BigInteger(1,
+                Hex.Decode("2AAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAAA984914A144")));
+            this.m_b = FromBigInteger(new BigInteger(1,
+                Hex.Decode("7B425ED097B425ED097B425ED097B425ED097B425ED097B4260B5E9C7710C864")));
+            this.m_order = new BigInteger(1, Hex.Decode("1000000000000000000000000000000014DEF9DEA2F79CD65812631A5CF5D3ED"));
+            this.m_cofactor = BigInteger.ValueOf(8);
+            this.m_coord = Curve25519_DEFAULT_COORDS;
+        }
+
+        protected override ECCurve CloneCurve()
+        {
+            return new Curve25519();
+        }
+
+        public override bool SupportsCoordinateSystem(int coord)
+        {
+            switch (coord)
+            {
+            case COORD_JACOBIAN_MODIFIED:
+                return true;
+            default:
+                return false;
+            }
+        }
+
+        public virtual BigInteger Q
+        {
+            get { return q; }
+        }
+
+        public override ECPoint Infinity
+        {
+            get { return m_infinity; }
+        }
+
+        public override int FieldSize
+        {
+            get { return q.BitLength; }
+        }
+
+        public override ECFieldElement FromBigInteger(BigInteger x)
+        {
+            return new Curve25519FieldElement(x);
+        }
+
+        protected internal override ECPoint CreateRawPoint(ECFieldElement x, ECFieldElement y, bool withCompression)
+        {
+            return new Curve25519Point(this, x, y, withCompression);
+        }
+
+        protected internal override ECPoint CreateRawPoint(ECFieldElement x, ECFieldElement y, ECFieldElement[] zs, bool withCompression)
+        {
+            return new Curve25519Point(this, x, y, zs, withCompression);
+        }
+    }
+}
+
+#endif