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using System;
using Org.BouncyCastle.Math;
namespace Org.BouncyCastle.Asn1.X509
{
/**
* Class for containing a restriction object subtrees in NameConstraints. See
* RFC 3280.
*
* <pre>
*
* GeneralSubtree ::= SEQUENCE
* {
* baseName GeneralName,
* minimum [0] BaseDistance DEFAULT 0,
* maximum [1] BaseDistance OPTIONAL
* }
* </pre>
*
* @see org.bouncycastle.asn1.x509.NameConstraints
*
*/
public class GeneralSubtree
: Asn1Encodable
{
private readonly GeneralName baseName;
private readonly DerInteger minimum;
private readonly DerInteger maximum;
private GeneralSubtree(
Asn1Sequence seq)
{
baseName = GeneralName.GetInstance(seq[0]);
switch (seq.Count)
{
case 1:
break;
case 2:
{
Asn1TaggedObject o = Asn1TaggedObject.GetInstance(seq[1]);
switch (o.TagNo)
{
case 0:
minimum = DerInteger.GetInstance(o, false);
break;
case 1:
maximum = DerInteger.GetInstance(o, false);
break;
default:
throw new ArgumentException("Bad tag number: " + o.TagNo);
}
break;
}
case 3:
{
{
Asn1TaggedObject oMin = Asn1TaggedObject.GetInstance(seq[1]);
if (oMin.TagNo != 0)
throw new ArgumentException("Bad tag number for 'minimum': " + oMin.TagNo);
minimum = DerInteger.GetInstance(oMin, false);
}
{
Asn1TaggedObject oMax = Asn1TaggedObject.GetInstance(seq[2]);
if (oMax.TagNo != 1)
throw new ArgumentException("Bad tag number for 'maximum': " + oMax.TagNo);
maximum = DerInteger.GetInstance(oMax, false);
}
break;
}
default:
throw new ArgumentException("Bad sequence size: " + seq.Count);
}
}
/**
* Constructor from a given details.
*
* According RFC 3280, the minimum and maximum fields are not used with any
* name forms, thus minimum MUST be zero, and maximum MUST be absent.
* <p>
* If minimum is <code>null</code>, zero is assumed, if
* maximum is <code>null</code>, maximum is absent.</p>
*
* @param baseName
* A restriction.
* @param minimum
* Minimum
*
* @param maximum
* Maximum
*/
public GeneralSubtree(
GeneralName baseName,
BigInteger minimum,
BigInteger maximum)
{
this.baseName = baseName;
if (minimum != null)
{
this.minimum = new DerInteger(minimum);
}
if (maximum != null)
{
this.maximum = new DerInteger(maximum);
}
}
public GeneralSubtree(
GeneralName baseName)
: this(baseName, null, null)
{
}
public static GeneralSubtree GetInstance(
Asn1TaggedObject o,
bool isExplicit)
{
return new GeneralSubtree(Asn1Sequence.GetInstance(o, isExplicit));
}
public static GeneralSubtree GetInstance(
object obj)
{
if (obj == null)
{
return null;
}
if (obj is GeneralSubtree)
{
return (GeneralSubtree) obj;
}
return new GeneralSubtree(Asn1Sequence.GetInstance(obj));
}
public GeneralName Base
{
get { return baseName; }
}
public BigInteger Minimum
{
get { return minimum == null ? BigInteger.Zero : minimum.Value; }
}
public BigInteger Maximum
{
get { return maximum == null ? null : maximum.Value; }
}
/**
* Produce an object suitable for an Asn1OutputStream.
*
* Returns:
*
* <pre>
* GeneralSubtree ::= SEQUENCE
* {
* baseName GeneralName,
* minimum [0] BaseDistance DEFAULT 0,
* maximum [1] BaseDistance OPTIONAL
* }
* </pre>
*
* @return a DERObject
*/
public override Asn1Object ToAsn1Object()
{
Asn1EncodableVector v = new Asn1EncodableVector(baseName);
if (minimum != null && minimum.Value.SignValue != 0)
{
v.Add(new DerTaggedObject(false, 0, minimum));
}
if (maximum != null)
{
v.Add(new DerTaggedObject(false, 1, maximum));
}
return new DerSequence(v);
}
}
}
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