1 /* ServerKeyExchange.java -- SSL ServerKeyExchange message. 2 Copyright (C) 2006 Free Software Foundation, Inc. 3 4 This file is a part of GNU Classpath. 5 6 GNU Classpath is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License as published by 8 the Free Software Foundation; either version 2 of the License, or (at 9 your option) any later version. 10 11 GNU Classpath is distributed in the hope that it will be useful, but 12 WITHOUT ANY WARRANTY; without even the implied warranty of 13 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 14 General Public License for more details. 15 16 You should have received a copy of the GNU General Public License 17 along with GNU Classpath; if not, write to the Free Software 18 Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 19 USA 20 21 Linking this library statically or dynamically with other modules is 22 making a combined work based on this library. Thus, the terms and 23 conditions of the GNU General Public License cover the whole 24 combination. 25 26 As a special exception, the copyright holders of this library give you 27 permission to link this library with independent modules to produce an 28 executable, regardless of the license terms of these independent 29 modules, and to copy and distribute the resulting executable under 30 terms of your choice, provided that you also meet, for each linked 31 independent module, the terms and conditions of the license of that 32 module. An independent module is a module which is not derived from 33 or based on this library. If you modify this library, you may extend 34 this exception to your version of the library, but you are not 35 obligated to do so. If you do not wish to do so, delete this 36 exception statement from your version. */ 37 38 39 package gnu.javax.net.ssl.provider; 40 41 import java.io.PrintWriter; 42 import java.io.StringWriter; 43 44 import java.nio.ByteBuffer; 45 import java.nio.ByteOrder; 46 47 /** 48 * The server key exchange message. 49 * 50 * <pre> 51 struct 52 { 53 select (KeyExchangeAlgorithm) 54 { 55 case diffie_hellman: 56 ServerDHParams params; 57 Signature signed_params; 58 case rsa: 59 ServerRSAParams params; 60 Signature signed_params; 61 case srp: 62 ServerSRPParams params; 63 Signature signed_params; 64 }; 65 } ServerKeyExchange; 66 </pre> 67 */ 68 public class ServerKeyExchange implements Handshake.Body 69 { 70 71 protected ByteBuffer buffer; 72 protected final CipherSuite suite; 73 ServerKeyExchange(final ByteBuffer buffer, final CipherSuite suite)74 public ServerKeyExchange(final ByteBuffer buffer, final CipherSuite suite) 75 { 76 suite.getClass(); 77 this.buffer = buffer.duplicate().order(ByteOrder.BIG_ENDIAN); 78 this.suite = suite; 79 } 80 length()81 public int length () 82 { 83 if (suite.keyExchangeAlgorithm ().equals (KeyExchangeAlgorithm.NONE)) 84 return 0; 85 int len = 0; 86 ServerKeyExchangeParams params = params(); 87 Signature sig = signature(); 88 if (params != null) 89 len += params.length(); 90 if (sig != null) 91 len += sig.length(); 92 return len; 93 } 94 95 /** 96 * Returns the server's key exchange parameters. The value returned will 97 * depend on the key exchange algorithm this object was created with. 98 * 99 * @return The server's key exchange parameters. 100 */ params()101 public ServerKeyExchangeParams params () 102 { 103 KeyExchangeAlgorithm kex = suite.keyExchangeAlgorithm (); 104 if (kex == KeyExchangeAlgorithm.RSA) 105 return new ServerRSAParams(buffer.duplicate ()); 106 else if (kex == KeyExchangeAlgorithm.DHE_DSS 107 || kex == KeyExchangeAlgorithm.DHE_RSA 108 || kex == KeyExchangeAlgorithm.DH_anon) 109 return new ServerDHParams(buffer.duplicate()); 110 // else if (kex.equals (KeyExchangeAlgorithm.SRP)) 111 // return new ServerSRPParams (buffer.duplicate ()); 112 else if (kex == KeyExchangeAlgorithm.NONE) 113 return null; 114 else if (kex == KeyExchangeAlgorithm.DHE_PSK) 115 return new ServerDHE_PSKParameters(buffer.duplicate()); 116 else if (kex == KeyExchangeAlgorithm.PSK) 117 return new ServerPSKParameters(buffer.duplicate()); 118 else if (kex == KeyExchangeAlgorithm.RSA_PSK) 119 return new ServerPSKParameters(buffer.duplicate()); 120 throw new IllegalArgumentException ("unsupported key exchange: " + kex); 121 } 122 123 /** 124 * Returns the digital signature made over the key exchange parameters. 125 * 126 * @return The signature. 127 */ signature()128 public Signature signature () 129 { 130 KeyExchangeAlgorithm kex = suite.keyExchangeAlgorithm(); 131 if (kex == KeyExchangeAlgorithm.NONE 132 || kex == KeyExchangeAlgorithm.DH_anon 133 || kex == KeyExchangeAlgorithm.DHE_PSK 134 || kex == KeyExchangeAlgorithm.PSK 135 || kex == KeyExchangeAlgorithm.RSA_PSK) 136 return null; 137 ServerKeyExchangeParams params = params(); 138 ByteBuffer sigbuf = ((ByteBuffer) buffer.position(params.length ())).slice (); 139 return new Signature (sigbuf, suite.signatureAlgorithm ()); 140 } 141 toString()142 public String toString() 143 { 144 return toString (null); 145 } 146 toString(final String prefix)147 public String toString (final String prefix) 148 { 149 StringWriter str = new StringWriter(); 150 PrintWriter out = new PrintWriter(str); 151 if (prefix != null) out.print (prefix); 152 out.println("struct {"); 153 if (prefix != null) out.print (prefix); 154 out.print (" algorithm: "); 155 out.print (suite.keyExchangeAlgorithm ()); 156 out.println (";"); 157 if (!suite.keyExchangeAlgorithm ().equals (KeyExchangeAlgorithm.NONE)) 158 { 159 if (prefix != null) out.print (prefix); 160 out.println (" parameters:"); 161 out.println (params ().toString (prefix != null ? prefix+" " : " ")); 162 } 163 if (!suite.signatureAlgorithm ().equals (SignatureAlgorithm.ANONYMOUS)) 164 { 165 if (prefix != null) out.print (prefix); 166 out.println (" signature:"); 167 out.println (signature ().toString (prefix != null ? prefix+" " : " ")); 168 } 169 if (prefix != null) out.print (prefix); 170 out.print ("} ServerKeyExchange;"); 171 return str.toString(); 172 } 173 } 174