/* * Copyright (c) 2005, 2010, 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 */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 == false) {            throw new InvalidAlgorithmParameterException(MSG);        }        this.spec = (TlsRsaPremasterSecretParameterSpec)params;        this.random = random;    }     protected void engineInit(int keysize, SecureRandom random) {        throw new InvalidParameterException(MSG);    }     protected SecretKey engineGenerateKey() {        if (spec == null) {            throw new IllegalStateException(                "TlsRsaPremasterSecretGenerator must be initialized");        }        if (random == null) {            random = new SecureRandom();        }        byte[] b = new byte[48];        random.nextBytes(b);        b[0] = (byte)spec.getMajorVersion();        b[1] = (byte)spec.getMinorVersion();        return new SecretKeySpec(b, "TlsRsaPremasterSecret");    } }