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The Bouncy Castle Crypto package is a Java implementation of cryptographic algorithms. This jar contains JCE provider and lightweight API for the Bouncy Castle Cryptography APIs for JDK 1.5 to JDK 1.8.
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package org.bouncycastle.crypto.tls;
import java.io.IOException;
import java.io.InputStream;
import java.io.OutputStream;
import java.math.BigInteger;
import org.bouncycastle.crypto.params.DHParameters;
import org.bouncycastle.crypto.params.DHPublicKeyParameters;
public class ServerDHParams
{
protected DHPublicKeyParameters publicKey;
public ServerDHParams(DHPublicKeyParameters publicKey)
{
if (publicKey == null)
{
throw new IllegalArgumentException("'publicKey' cannot be null");
}
this.publicKey = publicKey;
}
public DHPublicKeyParameters getPublicKey()
{
return publicKey;
}
/**
* Encode this {@link ServerDHParams} to an {@link OutputStream}.
*
* @param output
* the {@link OutputStream} to encode to.
* @throws IOException
*/
public void encode(OutputStream output) throws IOException
{
DHParameters dhParameters = publicKey.getParameters();
BigInteger Ys = publicKey.getY();
TlsDHUtils.writeDHParameter(dhParameters.getP(), output);
TlsDHUtils.writeDHParameter(dhParameters.getG(), output);
TlsDHUtils.writeDHParameter(Ys, output);
}
/**
* Parse a {@link ServerDHParams} from an {@link InputStream}.
*
* @param input
* the {@link InputStream} to parse from.
* @return a {@link ServerDHParams} object.
* @throws IOException
*/
public static ServerDHParams parse(InputStream input) throws IOException
{
BigInteger p = TlsDHUtils.readDHParameter(input);
BigInteger g = TlsDHUtils.readDHParameter(input);
BigInteger Ys = TlsDHUtils.readDHParameter(input);
return new ServerDHParams(TlsDHUtils.validateDHPublicKey(new DHPublicKeyParameters(Ys, new DHParameters(p, g))));
}
}