1 /* 2 * Copyright (c) 2006, 2016, 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 sun.security.ssl; 27 28 import java.io.IOException; 29 import java.util.ArrayList; 30 import java.util.List; 31 32 import javax.net.ssl.SSLProtocolException; 33 34 final class EllipticPointFormatsExtension extends HelloExtension { 35 36 static final int FMT_UNCOMPRESSED = 0; 37 static final int FMT_ANSIX962_COMPRESSED_PRIME = 1; 38 static final int FMT_ANSIX962_COMPRESSED_CHAR2 = 2; 39 40 static final HelloExtension DEFAULT = 41 new EllipticPointFormatsExtension(new byte[] {FMT_UNCOMPRESSED}); 42 43 private final byte[] formats; 44 45 private EllipticPointFormatsExtension(byte[] formats) { 46 super(ExtensionType.EXT_EC_POINT_FORMATS); 47 this.formats = formats; 48 } 49 50 EllipticPointFormatsExtension(HandshakeInStream s, int len) 51 throws IOException { 52 super(ExtensionType.EXT_EC_POINT_FORMATS); 53 formats = s.getBytes8(); 54 // RFC 4492 says uncompressed points must always be supported. 55 // Check just to make sure. 56 boolean uncompressed = false; 57 for (int format : formats) { 58 if (format == FMT_UNCOMPRESSED) { 59 uncompressed = true; 60 break; 61 } 62 } 63 if (uncompressed == false) { 64 throw new SSLProtocolException 65 ("Peer does not support uncompressed points"); 66 } 67 } 68 69 @Override 70 int length() { 71 return 5 + formats.length; 72 } 73 74 @Override 75 void send(HandshakeOutStream s) throws IOException { 76 s.putInt16(type.id); 77 s.putInt16(formats.length + 1); 78 s.putBytes8(formats); 79 } 80 81 private static String toString(byte format) { 82 int f = format & 0xff; 83 switch (f) { 84 case FMT_UNCOMPRESSED: 85 return "uncompressed"; 86 case FMT_ANSIX962_COMPRESSED_PRIME: 87 return "ansiX962_compressed_prime"; 88 case FMT_ANSIX962_COMPRESSED_CHAR2: 89 return "ansiX962_compressed_char2"; 90 default: 91 return "unknown-" + f; 92 } 93 } 94 95 @Override 96 public String toString() { 97 List<String> list = new ArrayList<String>(); 98 for (byte format : formats) { 99 list.add(toString(format)); 100 } 101 return "Extension " + type + ", formats: " + list; 102 } 103 }