/*
 * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package com.sun.crypto.provider;

import java.security.*;
import java.security.spec.AlgorithmParameterSpec;

import javax.crypto.*;
import javax.crypto.spec.SecretKeySpec;

import sun.security.internal.spec.TlsRsaPremasterSecretParameterSpec;

KeyGenerator implementation for the SSL/TLS RSA premaster secret.
Author: Andreas Sterbenz
Since: 1.6
/** * KeyGenerator implementation for the SSL/TLS RSA premaster secret. * * @author Andreas Sterbenz * @since 1.6 */
public final class TlsRsaPremasterSecretGenerator extends KeyGeneratorSpi { private final static String MSG = "TlsRsaPremasterSecretGenerator must be " + "initialized using a TlsRsaPremasterSecretParameterSpec"; private TlsRsaPremasterSecretParameterSpec spec; private SecureRandom random; public TlsRsaPremasterSecretGenerator() { } protected void engineInit(SecureRandom random) { throw new InvalidParameterException(MSG); } protected void engineInit(AlgorithmParameterSpec params, SecureRandom random) throws InvalidAlgorithmParameterException { if (!(params instanceof TlsRsaPremasterSecretParameterSpec)) { throw new InvalidAlgorithmParameterException(MSG); } this.spec = (TlsRsaPremasterSecretParameterSpec)params; this.random = random; } protected void engineInit(int keysize, SecureRandom random) { throw new InvalidParameterException(MSG); } // Only can be used in client side to generate TLS RSA premaster secret. protected SecretKey engineGenerateKey() { if (spec == null) { throw new IllegalStateException( "TlsRsaPremasterSecretGenerator must be initialized"); } byte[] b = spec.getEncodedSecret(); if (b == null) { if (random == null) { random = new SecureRandom(); } b = new byte[48]; random.nextBytes(b); } b[0] = (byte)spec.getMajorVersion(); b[1] = (byte)spec.getMinorVersion(); return new SecretKeySpec(b, "TlsRsaPremasterSecret"); } }