PolicyConstraints.java revision 5db505e1f6a68c8d5dfdb0fed0b8607dea7bed96 
1package org.bouncycastle.asn1.x509;
2
3import java.math.BigInteger;
4
5import org.bouncycastle.asn1.ASN1EncodableVector;
6import org.bouncycastle.asn1.ASN1Integer;
7import org.bouncycastle.asn1.ASN1Object;
8import org.bouncycastle.asn1.ASN1Primitive;
9import org.bouncycastle.asn1.ASN1Sequence;
10import org.bouncycastle.asn1.ASN1TaggedObject;
11import org.bouncycastle.asn1.DERSequence;
12import org.bouncycastle.asn1.DERTaggedObject;
13
14/**
15 * PKIX RFC 5280
16 * <pre>
17 * id-ce-policyConstraints OBJECT IDENTIFIER ::=  { id-ce 36 }
18 *
19 * PolicyConstraints ::= SEQUENCE {
20 *      requireExplicitPolicy           [0] SkipCerts OPTIONAL,
21 *      inhibitPolicyMapping            [1] SkipCerts OPTIONAL }
22 *
23 * SkipCerts ::= INTEGER (0..MAX)
24 * </pre>
25 */
26public class PolicyConstraints
27    extends ASN1Object
28{
29    private BigInteger requireExplicitPolicyMapping;
30    private BigInteger inhibitPolicyMapping;
31
32    public PolicyConstraints(BigInteger requireExplicitPolicyMapping, BigInteger inhibitPolicyMapping)
33    {
34        this.requireExplicitPolicyMapping = requireExplicitPolicyMapping;
35        this.inhibitPolicyMapping = inhibitPolicyMapping;
36    }
37
38    private PolicyConstraints(ASN1Sequence seq)
39    {
40        for (int i = 0; i != seq.size(); i++)
41        {
42            ASN1TaggedObject to = ASN1TaggedObject.getInstance(seq.getObjectAt(i));
43
44            if (to.getTagNo() == 0)
45            {
46                requireExplicitPolicyMapping = ASN1Integer.getInstance(to, false).getValue();
47            }
48            else if (to.getTagNo() == 1)
49            {
50                inhibitPolicyMapping = ASN1Integer.getInstance(to, false).getValue();
51            }
52            else
53            {
54                throw new IllegalArgumentException("Unknown tag encountered.");
55            }
56        }
57    }
58
59    public static PolicyConstraints getInstance(
60        Object  obj)
61    {
62        if (obj instanceof PolicyConstraints)
63        {
64            return (PolicyConstraints)obj;
65        }
66
67        if (obj != null)
68        {
69            return new PolicyConstraints(ASN1Sequence.getInstance(obj));
70        }
71
72        return null;
73    }
74
75    public static PolicyConstraints fromExtensions(Extensions extensions)
76    {
77        return PolicyConstraints.getInstance(extensions.getExtensionParsedValue(Extension.policyConstraints));
78    }
79
80    public BigInteger getRequireExplicitPolicyMapping()
81    {
82        return requireExplicitPolicyMapping;
83    }
84
85    public BigInteger getInhibitPolicyMapping()
86    {
87        return inhibitPolicyMapping;
88    }
89
90    public ASN1Primitive toASN1Primitive()
91    {
92        ASN1EncodableVector v = new ASN1EncodableVector();
93
94        if (requireExplicitPolicyMapping != null)
95        {
96            v.add(new DERTaggedObject(0, new ASN1Integer(requireExplicitPolicyMapping)));
97        }
98
99        if (inhibitPolicyMapping != null)
100        {
101            v.add(new DERTaggedObject(1, new ASN1Integer(inhibitPolicyMapping)));
102        }
103
104        return new DERSequence(v);
105    }
106}
107