| /* |
| * Copyright (c) 2006, 2016, 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 sun.security.ssl; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import javax.net.ssl.SSLProtocolException; |
| |
| final class EllipticPointFormatsExtension extends HelloExtension { |
| |
| static final int FMT_UNCOMPRESSED = 0; |
| static final int FMT_ANSIX962_COMPRESSED_PRIME = 1; |
| static final int FMT_ANSIX962_COMPRESSED_CHAR2 = 2; |
| |
| static final HelloExtension DEFAULT = |
| new EllipticPointFormatsExtension(new byte[] {FMT_UNCOMPRESSED}); |
| |
| private final byte[] formats; |
| |
| private EllipticPointFormatsExtension(byte[] formats) { |
| super(ExtensionType.EXT_EC_POINT_FORMATS); |
| this.formats = formats; |
| } |
| |
| EllipticPointFormatsExtension(HandshakeInStream s, int len) |
| throws IOException { |
| super(ExtensionType.EXT_EC_POINT_FORMATS); |
| formats = s.getBytes8(); |
| // RFC 4492 says uncompressed points must always be supported. |
| // Check just to make sure. |
| boolean uncompressed = false; |
| for (int format : formats) { |
| if (format == FMT_UNCOMPRESSED) { |
| uncompressed = true; |
| break; |
| } |
| } |
| if (uncompressed == false) { |
| throw new SSLProtocolException |
| ("Peer does not support uncompressed points"); |
| } |
| } |
| |
| @Override |
| int length() { |
| return 5 + formats.length; |
| } |
| |
| @Override |
| void send(HandshakeOutStream s) throws IOException { |
| s.putInt16(type.id); |
| s.putInt16(formats.length + 1); |
| s.putBytes8(formats); |
| } |
| |
| private static String toString(byte format) { |
| int f = format & 0xff; |
| switch (f) { |
| case FMT_UNCOMPRESSED: |
| return "uncompressed"; |
| case FMT_ANSIX962_COMPRESSED_PRIME: |
| return "ansiX962_compressed_prime"; |
| case FMT_ANSIX962_COMPRESSED_CHAR2: |
| return "ansiX962_compressed_char2"; |
| default: |
| return "unknown-" + f; |
| } |
| } |
| |
| @Override |
| public String toString() { |
| List<String> list = new ArrayList<String>(); |
| for (byte format : formats) { |
| list.add(toString(format)); |
| } |
| return "Extension " + type + ", formats: " + list; |
| } |
| } |