using Renci.SshNet.Security.Org.BouncyCastle.Math; using Renci.SshNet.Security.Org.BouncyCastle.Math.EC; using Renci.SshNet.Security.Org.BouncyCastle.Utilities; using System; namespace Renci.SshNet.Security.Org.BouncyCastle.Crypto.Parameters { internal class ECDomainParameters { internal ECCurve curve; internal byte[] seed; internal ECPoint g; internal BigInteger n; internal BigInteger h; internal BigInteger hInv; public ECCurve Curve => curve; public ECPoint G => g; public BigInteger N => n; public BigInteger H => h; public BigInteger HInv { get { lock (this) { if (hInv == null) hInv = h.ModInverse(n); return hInv; } } } public ECDomainParameters(ECCurve curve, ECPoint g, BigInteger n, BigInteger h, byte[] seed) { if (curve == null) throw new ArgumentNullException("curve"); if (g == null) throw new ArgumentNullException("g"); if (n == null) throw new ArgumentNullException("n"); this.curve = curve; this.g = Validate(curve, g); this.n = n; this.h = h; this.seed = Arrays.Clone(seed); } internal static ECPoint Validate(ECCurve c, ECPoint q) { if (q == null) throw new ArgumentException("Point has null value", "q"); q = ECAlgorithms.ImportPoint(c, q).Normalize(); if (q.IsInfinity) throw new ArgumentException("Point at infinity", "q"); if (!q.IsValid()) throw new ArgumentException("Point not on curve", "q"); return q; } } }