BestHTTP.SecureProtocol.Org.BouncyCastle.Math.EC.Rfc7748.X25519Field.SqrtRatioVar C# (CSharp) Метод

        public static bool SqrtRatioVar(int[] u, int[] v, int[] z)
        {
            int[] uv3 = Create();
            int[] uv7 = Create();

            Mul(u, v, uv3);
            Sqr(v, uv7);
            Mul(uv3, uv7, uv3);
            Sqr(uv7, uv7);
            Mul(uv7, uv3, uv7);

            int[] t = Create();
            int[] x = Create();
            PowPm5d8(uv7, t, x);
            Mul(x, uv3, x);

            int[] vx2 = Create();
            Sqr(x, vx2);
            Mul(vx2, v, vx2);

            Sub(vx2, u, t);
            Normalize(t);
            if (IsZeroVar(t))
            {
                Copy(x, 0, z, 0);
                return true;
            }

            Add(vx2, u, t);
            Normalize(t);
            if (IsZeroVar(t))
            {
                Mul(x, RootNegOne, z);
                return true;
            }

            return false;
        }