using System; using System.Collections; namespace Org.BouncyCastle.Asn1.X9 { public class DHDomainParameters : Asn1Encodable { private readonly DerInteger p, g, q, j; private readonly DHValidationParms validationParms; public static DHDomainParameters GetInstance(Asn1TaggedObject obj, bool isExplicit) { return GetInstance(Asn1Sequence.GetInstance(obj, isExplicit)); } public static DHDomainParameters GetInstance(object obj) { if (obj == null || obj is DHDomainParameters) return (DHDomainParameters)obj; if (obj is Asn1Sequence) return new DHDomainParameters((Asn1Sequence)obj); throw new ArgumentException("Invalid DHDomainParameters: " + obj.GetType().FullName, "obj"); } public DHDomainParameters(DerInteger p, DerInteger g, DerInteger q, DerInteger j, DHValidationParms validationParms) { if (p == null) throw new ArgumentNullException("p"); if (g == null) throw new ArgumentNullException("g"); if (q == null) throw new ArgumentNullException("q"); this.p = p; this.g = g; this.q = q; this.j = j; this.validationParms = validationParms; } private DHDomainParameters(Asn1Sequence seq) { if (seq.Count < 3 || seq.Count > 5) throw new ArgumentException("Bad sequence size: " + seq.Count, "seq"); IEnumerator e = seq.GetEnumerator(); this.p = DerInteger.GetInstance(GetNext(e)); this.g = DerInteger.GetInstance(GetNext(e)); this.q = DerInteger.GetInstance(GetNext(e)); Asn1Encodable next = GetNext(e); if (next != null && next is DerInteger) { this.j = DerInteger.GetInstance(next); next = GetNext(e); } if (next != null) { this.validationParms = DHValidationParms.GetInstance(next.ToAsn1Object()); } } private static Asn1Encodable GetNext(IEnumerator e) { return e.MoveNext() ? (Asn1Encodable)e.Current : null; } public DerInteger P { get { return this.p; } } public DerInteger G { get { return this.g; } } public DerInteger Q { get { return this.q; } } public DerInteger J { get { return this.j; } } public DHValidationParms ValidationParms { get { return this.validationParms; } } public override Asn1Object ToAsn1Object() { Asn1EncodableVector v = new Asn1EncodableVector(p, g, q); if (this.j != null) { v.Add(this.j); } if (this.validationParms != null) { v.Add(this.validationParms); } return new DerSequence(v); } } }