GnuDSAPublicKey.java [plain text]
package gnu.java.security.provider;
import gnu.java.security.OID;
import gnu.java.security.der.BitString;
import gnu.java.security.der.DER;
import gnu.java.security.der.DERValue;
import gnu.java.security.der.DERWriter;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.math.BigInteger;
import java.security.interfaces.DSAPublicKey;
import java.security.interfaces.DSAParams;
import java.security.spec.DSAParameterSpec;
import java.util.ArrayList;
public class GnuDSAPublicKey implements DSAPublicKey
{
private byte[] encodedKey;
BigInteger y;
BigInteger p;
BigInteger q;
BigInteger g;
public GnuDSAPublicKey(BigInteger y, BigInteger p, BigInteger q, BigInteger g )
{
this.y = y;
this.p = p;
this.q = q;
this.g = g;
}
public String getAlgorithm()
{
return "DSA";
}
public String getFormat()
{
return "X.509";
}
public byte[] getEncoded()
{
if (encodedKey != null)
return (byte[]) encodedKey.clone();
try
{
ByteArrayOutputStream out = new ByteArrayOutputStream();
ArrayList spki = new ArrayList(2);
ArrayList alg = new ArrayList(2);
alg.add(new DERValue(DER.OBJECT_IDENTIFIER,
new OID("1.2.840.113549.1.1.1")));
ArrayList params = new ArrayList(3);
params.add(new DERValue(DER.INTEGER, p));
params.add(new DERValue(DER.INTEGER, q));
params.add(new DERValue(DER.INTEGER, g));
alg.add(new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, params));
spki.add(new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, alg));
spki.add(new DERValue(DER.BIT_STRING, new BitString(y.toByteArray())));
DERWriter.write(out, new DERValue(DER.CONSTRUCTED|DER.SEQUENCE, spki));
return (byte[]) (encodedKey = out.toByteArray()).clone();
}
catch (IOException ioe)
{
return null;
}
}
public DSAParams getParams()
{
if (p == null || q == null || g == null)
return null;
return (DSAParams)(new DSAParameterSpec(p,q,g));
}
public BigInteger getY()
{
return y;
}
public String toString()
{
return
"GnuDSAPublicKey: y=" + (y != null ? y.toString(16) : "(null)") +
" p=" + (p != null ? p.toString(16) : "(null)") +
" q=" + (q != null ? q.toString(16) : "(null)") +
" g=" + (g != null ? g.toString(16) : "(null)");
}
}