using Org.BouncyCastle.Math; using System; namespace Org.BouncyCastle.Asn1.X9 { public class X9FieldID : Asn1Encodable { private readonly DerObjectIdentifier id; private readonly Asn1Object parameters; public DerObjectIdentifier Identifier => id; public Asn1Object Parameters => parameters; public X9FieldID(BigInteger primeP) { id = X9ObjectIdentifiers.PrimeField; parameters = new DerInteger(primeP); } public X9FieldID(int m, int k1) : this(m, k1, 0, 0) { } public X9FieldID(int m, int k1, int k2, int k3) { id = X9ObjectIdentifiers.CharacteristicTwoField; Asn1EncodableVector asn1EncodableVector = new Asn1EncodableVector(new DerInteger(m)); if (k2 == 0) { if (k3 != 0) throw new ArgumentException("inconsistent k values"); asn1EncodableVector.Add(X9ObjectIdentifiers.TPBasis, new DerInteger(k1)); } else { if (k2 <= k1 || k3 <= k2) throw new ArgumentException("inconsistent k values"); asn1EncodableVector.Add(X9ObjectIdentifiers.PPBasis, new DerSequence(new DerInteger(k1), new DerInteger(k2), new DerInteger(k3))); } parameters = new DerSequence(asn1EncodableVector); } private X9FieldID(Asn1Sequence seq) { id = DerObjectIdentifier.GetInstance(seq[0]); parameters = seq[1].ToAsn1Object(); } public static X9FieldID GetInstance(object obj) { if (obj is X9FieldID) return (X9FieldID)obj; if (obj == null) return null; return new X9FieldID(Asn1Sequence.GetInstance(obj)); } public override Asn1Object ToAsn1Object() { return new DerSequence(id, parameters); } } }