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The Bouncy Castle Java APIs for TLS and DTLS, including a provider for the JSSE.

There is a newer version: 1.70

package org.bouncycastle.tls;

import java.io.IOException;
import java.io.OutputStream;

import org.bouncycastle.tls.crypto.TlsCertificate;
import org.bouncycastle.tls.crypto.TlsSecret;

/**
 * RSA Utility methods.
 */
public abstract class TlsRSAUtils
{
    private TlsRSAUtils()
    {
    }

    /*
     * Generate a pre_master_secret and send it encrypted to the server
     */
    public static TlsSecret generateEncryptedPreMasterSecret(TlsContext context, TlsCertificate certificate,
        OutputStream output) throws IOException
    {
        TlsSecret preMasterSecret = context.getCrypto().generateRSAPreMasterSecret(context.getClientVersion());

        byte[] encryptedPreMasterSecret = preMasterSecret.encrypt(certificate);
        TlsUtils.writeOpaque16(encryptedPreMasterSecret, output);

        return preMasterSecret;
    }
}