nl.open.jwtdependency.org.bouncycastle.jce.provider.JDKDSAPublicKey Maven / Gradle / Ivy

Go to download
Show more of this group Show more artifacts with this name
Show all versions of java-jwt-nodependencies Show documentation
This is a drop in replacement for the auth0 java-jwt library (see https://github.com/auth0/java-jwt). This jar makes sure there are no external dependencies (e.g. fasterXml, Apacha Commons) needed. This is useful when deploying to an application server (e.g. tomcat with Alfreso or Pega).
The newest version!
package org.bouncycastle.jce.provider;

import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.math.BigInteger;
import java.security.interfaces.DSAParams;
import java.security.interfaces.DSAPublicKey;
import java.security.spec.DSAParameterSpec;
import java.security.spec.DSAPublicKeySpec;

import org.bouncycastle.asn1.ASN1Encodable;
import org.bouncycastle.asn1.ASN1Encoding;
import org.bouncycastle.asn1.ASN1Integer;
import org.bouncycastle.asn1.DERNull;
import org.bouncycastle.asn1.x509.AlgorithmIdentifier;
import org.bouncycastle.asn1.x509.DSAParameter;
import org.bouncycastle.asn1.x509.SubjectPublicKeyInfo;
import org.bouncycastle.asn1.x9.X9ObjectIdentifiers;
import org.bouncycastle.crypto.params.DSAPublicKeyParameters;
import org.bouncycastle.util.Strings;

public class JDKDSAPublicKey
    implements DSAPublicKey
{
    private static final long serialVersionUID = 1752452449903495175L;

    private BigInteger      y;
    private DSAParams       dsaSpec;

    JDKDSAPublicKey(
        DSAPublicKeySpec    spec)
    {
        this.y = spec.getY();
        this.dsaSpec = new DSAParameterSpec(spec.getP(), spec.getQ(), spec.getG());
    }

    JDKDSAPublicKey(
        DSAPublicKey    key)
    {
        this.y = key.getY();
        this.dsaSpec = key.getParams();
    }

    JDKDSAPublicKey(
        DSAPublicKeyParameters  params)
    {
        this.y = params.getY();
        this.dsaSpec = new DSAParameterSpec(params.getParameters().getP(), params.getParameters().getQ(), params.getParameters().getG());
    }

    JDKDSAPublicKey(
        BigInteger        y,
        DSAParameterSpec  dsaSpec)
    {
        this.y = y;
        this.dsaSpec = dsaSpec;
    }

    JDKDSAPublicKey(
        SubjectPublicKeyInfo    info)
    {

        ASN1Integer              derY;

        try
        {
            derY = (ASN1Integer)info.parsePublicKey();
        }
        catch (IOException e)
        {
            throw new IllegalArgumentException("invalid info structure in DSA public key");
        }

        this.y = derY.getValue();

        if (isNotNull(info.getAlgorithm().getParameters()))
        {
            DSAParameter params = DSAParameter.getInstance(info.getAlgorithm().getParameters());
            
            this.dsaSpec = new DSAParameterSpec(params.getP(), params.getQ(), params.getG());
        }
    }

    private boolean isNotNull(ASN1Encodable parameters)
    {
        return parameters != null && !DERNull.INSTANCE.equals(parameters);
    }

    public String getAlgorithm()
    {
        return "DSA";
    }

    public String getFormat()
    {
        return "X.509";
    }

    public byte[] getEncoded()
    {
        try
        {
            if (dsaSpec == null)
            {
                return new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa), new ASN1Integer(y)).getEncoded(ASN1Encoding.DER);
            }

            return new SubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa, new DSAParameter(dsaSpec.getP(), dsaSpec.getQ(), dsaSpec.getG())), new ASN1Integer(y)).getEncoded(ASN1Encoding.DER);
        }
        catch (IOException e)
        {
            return null;
        }
    }

    public DSAParams getParams()
    {
        return dsaSpec;
    }

    public BigInteger getY()
    {
        return y;
    }

    public String toString()
    {
        StringBuffer    buf = new StringBuffer();
        String          nl = Strings.lineSeparator();

        buf.append("DSA Public Key").append(nl);
        buf.append("            y: ").append(this.getY().toString(16)).append(nl);

        return buf.toString();
    }

    public int hashCode()
    {
        return this.getY().hashCode() ^ this.getParams().getG().hashCode() 
                ^ this.getParams().getP().hashCode() ^ this.getParams().getQ().hashCode();
    }

    public boolean equals(
        Object o)
    {
        if (!(o instanceof DSAPublicKey))
        {
            return false;
        }
        
        DSAPublicKey other = (DSAPublicKey)o;
        
        return this.getY().equals(other.getY()) 
            && this.getParams().getG().equals(other.getParams().getG()) 
            && this.getParams().getP().equals(other.getParams().getP()) 
            && this.getParams().getQ().equals(other.getParams().getQ());
    }

    private void readObject(
        ObjectInputStream in)
        throws IOException, ClassNotFoundException
    {
        this.y = (BigInteger)in.readObject();
        this.dsaSpec = new DSAParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject(), (BigInteger)in.readObject());
    }

    private void writeObject(
        ObjectOutputStream out)
        throws IOException
    {
        out.writeObject(y);
        out.writeObject(dsaSpec.getP());
        out.writeObject(dsaSpec.getQ());
        out.writeObject(dsaSpec.getG());
    }
}