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package org.bouncycastle.asn1.x509;
import java.math.BigInteger;
import org.bouncycastle.asn1.ASN1Boolean;
import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.ASN1TaggedObject;
import org.bouncycastle.asn1.DERSequence;
public class BasicConstraints
extends ASN1Object
{
ASN1Boolean cA = ASN1Boolean.getInstance(false);
ASN1Integer pathLenConstraint = null;
public static BasicConstraints getInstance(
ASN1TaggedObject obj,
boolean explicit)
{
return getInstance(ASN1Sequence.getInstance(obj, explicit));
}
public static BasicConstraints getInstance(
Object obj)
{
if (obj instanceof BasicConstraints)
{
return (BasicConstraints)obj;
}
if (obj instanceof X509Extension)
{
return getInstance(X509Extension.convertValueToObject((X509Extension)obj));
}
if (obj != null)
{
return new BasicConstraints(ASN1Sequence.getInstance(obj));
}
return null;
}
public static BasicConstraints fromExtensions(Extensions extensions)
{
return BasicConstraints.getInstance(extensions.getExtensionParsedValue(Extension.basicConstraints));
}
private BasicConstraints(
ASN1Sequence seq)
{
if (seq.size() == 0)
{
this.cA = null;
this.pathLenConstraint = null;
}
else
{
if (seq.getObjectAt(0) instanceof ASN1Boolean)
{
this.cA = ASN1Boolean.getInstance(seq.getObjectAt(0));
}
else
{
this.cA = null;
this.pathLenConstraint = ASN1Integer.getInstance(seq.getObjectAt(0));
}
if (seq.size() > 1)
{
if (this.cA != null)
{
this.pathLenConstraint = ASN1Integer.getInstance(seq.getObjectAt(1));
}
else
{
throw new IllegalArgumentException("wrong sequence in constructor");
}
}
}
}
public BasicConstraints(
boolean cA)
{
if (cA)
{
this.cA = ASN1Boolean.getInstance(true);
}
else
{
this.cA = null;
}
this.pathLenConstraint = null;
}
/**
* create a cA=true object for the given path length constraint.
*
* @param pathLenConstraint
*/
public BasicConstraints(
int pathLenConstraint)
{
this.cA = ASN1Boolean.getInstance(true);
this.pathLenConstraint = new ASN1Integer(pathLenConstraint);
}
public boolean isCA()
{
return (cA != null) && cA.isTrue();
}
public BigInteger getPathLenConstraint()
{
if (pathLenConstraint != null)
{
return pathLenConstraint.getValue();
}
return null;
}
/**
* Produce an object suitable for an ASN1OutputStream.
* <pre>
* BasicConstraints := SEQUENCE {
* cA BOOLEAN DEFAULT FALSE,
* pathLenConstraint INTEGER (0..MAX) OPTIONAL
* }
* </pre>
*/
public ASN1Primitive toASN1Primitive()
{
ASN1EncodableVector v = new ASN1EncodableVector();
if (cA != null)
{
v.add(cA);
}
if (pathLenConstraint != null) // yes some people actually do this when cA is false...
{
v.add(pathLenConstraint);
}
return new DERSequence(v);
}
public String toString()
{
if (pathLenConstraint == null)
{
if (cA == null)
{
return "BasicConstraints: isCa(false)";
}
return "BasicConstraints: isCa(" + this.isCA() + ")";
}
return "BasicConstraints: isCa(" + this.isCA() + "), pathLenConstraint = " + pathLenConstraint.getValue();
}
}
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