using Org.BouncyCastle.Math; using System; namespace Org.BouncyCastle.Asn1.Pkcs { public class DHParameter : Asn1Encodable { private readonly DerInteger m_p; private readonly DerInteger m_g; private readonly DerInteger m_l; public BigInteger P => m_p.PositiveValue; public BigInteger G => m_g.PositiveValue; public BigInteger L => m_l?.PositiveValue; public static DHParameter GetInstance(object obj) { if (obj == null) return null; DHParameter dHParameter = obj as DHParameter; if (dHParameter != null) return dHParameter; return new DHParameter(Asn1Sequence.GetInstance(obj)); } public static DHParameter GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit) { return new DHParameter(Asn1Sequence.GetInstance(taggedObject, declaredExplicit)); } public static DHParameter GetTagged(Asn1TaggedObject taggedObject, bool declaredExplicit) { return new DHParameter(Asn1Sequence.GetTagged(taggedObject, declaredExplicit)); } public DHParameter(BigInteger p, BigInteger g, int l) { m_p = new DerInteger(p); m_g = new DerInteger(g); if (l != 0) m_l = new DerInteger(l); } [Obsolete("Use 'GetInstance' instead")] public DHParameter(Asn1Sequence seq) { int count = seq.Count; int sequencePosition = 0; if (count < 2 || count > 3) throw new ArgumentException("Bad sequence size: " + count.ToString(), "seq"); m_p = DerInteger.GetInstance(seq[sequencePosition++]); m_g = DerInteger.GetInstance(seq[sequencePosition++]); m_l = Asn1Utilities.ReadOptional(seq, ref sequencePosition, DerInteger.GetOptional); if (sequencePosition != count) throw new ArgumentException("Unexpected elements in sequence", "seq"); } public override Asn1Object ToAsn1Object() { if (m_l != null) return new DerSequence(m_p, m_g, m_l); return new DerSequence(m_p, m_g); } } }