org.bouncycastle.asn1.x509.DSAParameter.java Source code

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Here is the source code for org.bouncycastle.asn1.x509.DSAParameter.java

Source

package org.bouncycastle.asn1.x509;

import java.math.BigInteger;
import java.util.Enumeration;

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 DSAParameter extends ASN1Object {
    ASN1Integer p, q, g;

    public static DSAParameter getInstance(ASN1TaggedObject obj, boolean explicit) {
        return getInstance(ASN1Sequence.getInstance(obj, explicit));
    }

    public static DSAParameter getInstance(Object obj) {
        if (obj instanceof DSAParameter) {
            return (DSAParameter) obj;
        }

        if (obj != null) {
            return new DSAParameter(ASN1Sequence.getInstance(obj));
        }

        return null;
    }

    public DSAParameter(BigInteger p, BigInteger q, BigInteger g) {
        this.p = new ASN1Integer(p);
        this.q = new ASN1Integer(q);
        this.g = new ASN1Integer(g);
    }

    private DSAParameter(ASN1Sequence seq) {
        if (seq.size() != 3) {
            throw new IllegalArgumentException("Bad sequence size: " + seq.size());
        }

        Enumeration e = seq.getObjects();

        p = ASN1Integer.getInstance(e.nextElement());
        q = ASN1Integer.getInstance(e.nextElement());
        g = ASN1Integer.getInstance(e.nextElement());
    }

    public BigInteger getP() {
        return p.getPositiveValue();
    }

    public BigInteger getQ() {
        return q.getPositiveValue();
    }

    public BigInteger getG() {
        return g.getPositiveValue();
    }

    public ASN1Primitive toASN1Primitive() {
        ASN1EncodableVector v = new ASN1EncodableVector(3);

        v.add(p);
        v.add(q);
        v.add(g);

        return new DERSequence(v);
    }
}