bcprov/src/main/java/org/bouncycastle/asn1/x9/KeySpecificInfo.java


1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68

package org.bouncycastle.asn1.x9;

import java.util.Enumeration;

import org.bouncycastle.asn1.ASN1EncodableVector;
import org.bouncycastle.asn1.ASN1Object;
import org.bouncycastle.asn1.ASN1ObjectIdentifier;
import org.bouncycastle.asn1.ASN1OctetString;
import org.bouncycastle.asn1.ASN1Primitive;
import org.bouncycastle.asn1.ASN1Sequence;
import org.bouncycastle.asn1.DERSequence;

/**
 * ASN.1 def for Diffie-Hellman key exchange KeySpecificInfo structure. See
 * RFC 2631, or X9.42, for further details.
 */
public class KeySpecificInfo
    extends ASN1Object
{
    private ASN1ObjectIdentifier algorithm;
    private ASN1OctetString      counter;

    public KeySpecificInfo(
        ASN1ObjectIdentifier algorithm,
        ASN1OctetString      counter)
    {
        this.algorithm = algorithm;
        this.counter = counter;
    }

    public KeySpecificInfo(
        ASN1Sequence  seq)
    {
        Enumeration e = seq.getObjects();

        algorithm = (ASN1ObjectIdentifier)e.nextElement();
        counter = (ASN1OctetString)e.nextElement();
    }

    public ASN1ObjectIdentifier getAlgorithm()
    {
        return algorithm;
    }

    public ASN1OctetString getCounter()
    {
        return counter;
    }

    /**
     * Produce an object suitable for an ASN1OutputStream.
     * <pre>
     *  KeySpecificInfo ::= SEQUENCE {
     *      algorithm OBJECT IDENTIFIER,
     *      counter OCTET STRING SIZE (4..4)
     *  }
     * </pre>
     */
    public ASN1Primitive toASN1Primitive()
    {
        ASN1EncodableVector  v = new ASN1EncodableVector();

        v.add(algorithm);
        v.add(counter);

        return new DERSequence(v);
    }
}