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package org.spongycastle.jcajce.provider.asymmetric.dsa;
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.spongycastle.asn1.ASN1Encodable;
import org.spongycastle.asn1.ASN1Integer;
import org.spongycastle.asn1.DERNull;
import org.spongycastle.asn1.x509.AlgorithmIdentifier;
import org.spongycastle.asn1.x509.DSAParameter;
import org.spongycastle.asn1.x509.SubjectPublicKeyInfo;
import org.spongycastle.asn1.x9.X9ObjectIdentifiers;
import org.spongycastle.crypto.params.DSAPublicKeyParameters;
import org.spongycastle.jcajce.provider.asymmetric.util.KeyUtil;
public class BCDSAPublicKey
implements DSAPublicKey
{
private static final long serialVersionUID = 1752452449903495175L;
private BigInteger y;
private transient DSAParams dsaSpec;
BCDSAPublicKey(
DSAPublicKeySpec spec)
{
this.y = spec.getY();
this.dsaSpec = new DSAParameterSpec(spec.getP(), spec.getQ(), spec.getG());
}
BCDSAPublicKey(
DSAPublicKey key)
{
this.y = key.getY();
this.dsaSpec = key.getParams();
}
BCDSAPublicKey(
DSAPublicKeyParameters params)
{
this.y = params.getY();
this.dsaSpec = new DSAParameterSpec(params.getParameters().getP(), params.getParameters().getQ(), params.getParameters().getG());
}
BCDSAPublicKey(
BigInteger y,
DSAParameterSpec dsaSpec)
{
this.y = y;
this.dsaSpec = dsaSpec;
}
public BCDSAPublicKey(
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.toASN1Primitive());
}
public String getAlgorithm()
{
return "DSA";
}
public String getFormat()
{
return "X.509";
}
public byte[] getEncoded()
{
if (dsaSpec == null)
{
return KeyUtil.getEncodedSubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa), new ASN1Integer(y));
}
return KeyUtil.getEncodedSubjectPublicKeyInfo(new AlgorithmIdentifier(X9ObjectIdentifiers.id_dsa, new DSAParameter(dsaSpec.getP(), dsaSpec.getQ(), dsaSpec.getG()).toASN1Primitive()), new ASN1Integer(y));
}
public DSAParams getParams()
{
return dsaSpec;
}
public BigInteger getY()
{
return y;
}
public String toString()
{
StringBuffer buf = new StringBuffer();
String nl = System.getProperty("line.separator");
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
{
in.defaultReadObject();
this.dsaSpec = new DSAParameterSpec((BigInteger)in.readObject(), (BigInteger)in.readObject(), (BigInteger)in.readObject());
}
private void writeObject(
ObjectOutputStream out)
throws IOException
{
out.defaultWriteObject();
out.writeObject(dsaSpec.getP());
out.writeObject(dsaSpec.getQ());
out.writeObject(dsaSpec.getG());
}
}
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