1 /* 2 * Copyright (c) 2005, 2014, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. Oracle designates this 8 * particular file as subject to the "Classpath" exception as provided 9 * by Oracle in the LICENSE file that accompanied this code. 10 * 11 * This code is distributed in the hope that it will be useful, but WITHOUT 12 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 13 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 14 * version 2 for more details (a copy is included in the LICENSE file that 15 * accompanied this code). 16 * 17 * You should have received a copy of the GNU General Public License version 18 * 2 along with this work; if not, write to the Free Software Foundation, 19 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 20 * 21 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 22 * or visit www.oracle.com if you need additional information or have any 23 * questions. 24 */ 25 26 package com.sun.crypto.provider; 27 28 import java.security.*; 29 import java.security.spec.AlgorithmParameterSpec; 30 31 import javax.crypto.*; 32 import javax.crypto.spec.SecretKeySpec; 33 34 import sun.security.internal.spec.TlsRsaPremasterSecretParameterSpec; 35 36 /** 37 * KeyGenerator implementation for the SSL/TLS RSA premaster secret. 38 * 39 * @author Andreas Sterbenz 40 * @since 1.6 41 */ 42 public final class TlsRsaPremasterSecretGenerator extends KeyGeneratorSpi { 43 44 private final static String MSG = "TlsRsaPremasterSecretGenerator must be " 45 + "initialized using a TlsRsaPremasterSecretParameterSpec"; 46 47 private TlsRsaPremasterSecretParameterSpec spec; 48 private SecureRandom random; 49 TlsRsaPremasterSecretGenerator()50 public TlsRsaPremasterSecretGenerator() { 51 } 52 engineInit(SecureRandom random)53 protected void engineInit(SecureRandom random) { 54 throw new InvalidParameterException(MSG); 55 } 56 engineInit(AlgorithmParameterSpec params, SecureRandom random)57 protected void engineInit(AlgorithmParameterSpec params, 58 SecureRandom random) throws InvalidAlgorithmParameterException { 59 if (!(params instanceof TlsRsaPremasterSecretParameterSpec)) { 60 throw new InvalidAlgorithmParameterException(MSG); 61 } 62 this.spec = (TlsRsaPremasterSecretParameterSpec)params; 63 this.random = random; 64 } 65 engineInit(int keysize, SecureRandom random)66 protected void engineInit(int keysize, SecureRandom random) { 67 throw new InvalidParameterException(MSG); 68 } 69 70 // Only can be used in client side to generate TLS RSA premaster secret. engineGenerateKey()71 protected SecretKey engineGenerateKey() { 72 if (spec == null) { 73 throw new IllegalStateException( 74 "TlsRsaPremasterSecretGenerator must be initialized"); 75 } 76 77 byte[] b = spec.getEncodedSecret(); 78 if (b == null) { 79 if (random == null) { 80 random = new SecureRandom(); 81 } 82 b = new byte[48]; 83 random.nextBytes(b); 84 } 85 b[0] = (byte)spec.getMajorVersion(); 86 b[1] = (byte)spec.getMinorVersion(); 87 88 return new SecretKeySpec(b, "TlsRsaPremasterSecret"); 89 } 90 91 } 92