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using System;
using Org.BouncyCastle.Math;
using Org.BouncyCastle.Utilities;
namespace Org.BouncyCastle.Asn1.X509
{
public class BasicConstraints
: Asn1Encodable
{
private readonly DerBoolean cA;
private readonly DerInteger pathLenConstraint;
public static BasicConstraints GetInstance(
Asn1TaggedObject obj,
bool explicitly)
{
return GetInstance(Asn1Sequence.GetInstance(obj, explicitly));
}
public static BasicConstraints GetInstance(
object obj)
{
if (obj == null || obj is BasicConstraints)
{
return (BasicConstraints) obj;
}
if (obj is Asn1Sequence)
{
return new BasicConstraints((Asn1Sequence) obj);
}
if (obj is X509Extension)
{
return GetInstance(X509Extension.ConvertValueToObject((X509Extension) obj));
}
throw new ArgumentException("unknown object in factory: " + Platform.GetTypeName(obj), "obj");
}
private BasicConstraints(
Asn1Sequence seq)
{
if (seq.Count > 0)
{
if (seq[0] is DerBoolean)
{
this.cA = DerBoolean.GetInstance(seq[0]);
}
else
{
this.pathLenConstraint = DerInteger.GetInstance(seq[0]);
}
if (seq.Count > 1)
{
if (this.cA == null)
throw new ArgumentException("wrong sequence in constructor", "seq");
this.pathLenConstraint = DerInteger.GetInstance(seq[1]);
}
}
}
public BasicConstraints(
bool cA)
{
if (cA)
{
this.cA = DerBoolean.True;
}
}
/**
* create a cA=true object for the given path length constraint.
*
* @param pathLenConstraint
*/
public BasicConstraints(
int pathLenConstraint)
{
this.cA = DerBoolean.True;
this.pathLenConstraint = new DerInteger(pathLenConstraint);
}
public bool IsCA()
{
return cA != null && cA.IsTrue;
}
public BigInteger PathLenConstraint
{
get { return pathLenConstraint == null ? null : pathLenConstraint.Value; }
}
/**
* Produce an object suitable for an Asn1OutputStream.
* <pre>
* BasicConstraints := Sequence {
* cA Boolean DEFAULT FALSE,
* pathLenConstraint Integer (0..MAX) OPTIONAL
* }
* </pre>
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector();
v.AddOptional(cA,
pathLenConstraint); // yes some people actually do this when cA is false...
return new DerSequence(v);
}
public override string ToString()
{
if (pathLenConstraint == null)
{
return "BasicConstraints: isCa(" + this.IsCA() + ")";
}
return "BasicConstraints: isCa(" + this.IsCA() + "), pathLenConstraint = " + pathLenConstraint.Value;
}
}
}
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