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using System;
using Org.BouncyCastle.Math;
namespace Org.BouncyCastle.Asn1.Pkcs
{
public class DHParameter
: Asn1Encodable
{
public static DHParameter GetInstance(object obj)
{
if (obj == null)
return null;
if (obj is DHParameter dhParameter)
return dhParameter;
#pragma warning disable CS0618 // Type or member is obsolete
return new DHParameter(Asn1Sequence.GetInstance(obj));
#pragma warning restore CS0618 // Type or member is obsolete
}
public static DHParameter GetInstance(Asn1TaggedObject taggedObject, bool declaredExplicit)
{
#pragma warning disable CS0618 // Type or member is obsolete
return new DHParameter(Asn1Sequence.GetInstance(taggedObject, declaredExplicit));
#pragma warning restore CS0618 // Type or member is obsolete
}
private readonly DerInteger m_p, m_g, m_l;
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, pos = 0;
if (count < 2 || count > 3)
throw new ArgumentException("Bad sequence size: " + count, nameof(seq));
m_p = DerInteger.GetInstance(seq[pos++]);
m_g = DerInteger.GetInstance(seq[pos++]);
m_l = Asn1Utilities.ReadOptional(seq, ref pos, DerInteger.GetOptional);
if (pos != count)
throw new ArgumentException("Unexpected elements in sequence", nameof(seq));
}
public BigInteger P => m_p.PositiveValue;
public BigInteger G => m_g.PositiveValue;
public BigInteger L => m_l?.PositiveValue;
public override Asn1Object ToAsn1Object()
{
return m_l == null
? new DerSequence(m_p, m_g)
: new DerSequence(m_p, m_g, m_l);
}
}
}
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