| /* Signature.java -- SSL Signature structure. |
| Copyright (C) 2006 Free Software Foundation, Inc. |
| |
| This file is a part of GNU Classpath. |
| |
| GNU Classpath is free software; you can redistribute it and/or modify |
| it under the terms of the GNU General Public License as published by |
| the Free Software Foundation; either version 2 of the License, or (at |
| your option) any later version. |
| |
| GNU Classpath 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 for more details. |
| |
| You should have received a copy of the GNU General Public License |
| along with GNU Classpath; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 |
| USA |
| |
| Linking this library statically or dynamically with other modules is |
| making a combined work based on this library. Thus, the terms and |
| conditions of the GNU General Public License cover the whole |
| combination. |
| |
| As a special exception, the copyright holders of this library give you |
| permission to link this library with independent modules to produce an |
| executable, regardless of the license terms of these independent |
| modules, and to copy and distribute the resulting executable under |
| terms of your choice, provided that you also meet, for each linked |
| independent module, the terms and conditions of the license of that |
| module. An independent module is a module which is not derived from |
| or based on this library. If you modify this library, you may extend |
| this exception to your version of the library, but you are not |
| obligated to do so. If you do not wish to do so, delete this |
| exception statement from your version. */ |
| |
| |
| package gnu.javax.net.ssl.provider; |
| |
| import java.io.PrintWriter; |
| import java.io.StringWriter; |
| |
| import java.nio.ByteBuffer; |
| |
| /** |
| * The signature structure. |
| * |
| * <pre> |
| select (SignatureAlgorithm) |
| { |
| case anonymous: |
| struct { }; |
| case rsa: |
| digitally-signed struct |
| { |
| opaque md5_hash[16]; |
| opaque sha_hash[20]; |
| }; |
| case dsa: |
| digitally-signed struct |
| { |
| opaque sha_hash[20]; |
| }; |
| } Signature;</pre> |
| */ |
| public class Signature implements Builder, Constructed |
| { |
| |
| // Fields. |
| // ------------------------------------------------------------------------- |
| |
| private final ByteBuffer buffer; |
| private final SignatureAlgorithm alg; |
| |
| // Constructor. |
| // ------------------------------------------------------------------------- |
| |
| public Signature (final ByteBuffer buffer, final SignatureAlgorithm alg) |
| { |
| this.buffer = buffer; |
| this.alg = alg; |
| } |
| |
| public Signature (final byte[] sigValue, final SignatureAlgorithm alg) |
| { |
| buffer = ByteBuffer.allocate(sigValue.length + 2); |
| buffer.putShort((short) sigValue.length); |
| buffer.put(sigValue); |
| buffer.position(0); |
| this.alg = alg; |
| } |
| |
| // Instance methods. |
| // ------------------------------------------------------------------------- |
| |
| public int length () |
| { |
| if (alg.equals (SignatureAlgorithm.ANONYMOUS)) |
| return 0; |
| return (buffer.getShort (0) & 0xFFFF) + 2; |
| } |
| |
| public ByteBuffer buffer() |
| { |
| return (ByteBuffer) buffer.duplicate().limit(length()); |
| } |
| |
| public byte[] signature () |
| { |
| if (alg.equals (SignatureAlgorithm.ANONYMOUS)) |
| return new byte[0]; |
| int length = buffer.getShort (0) & 0xFFFF; |
| byte[] buf = new byte[length]; |
| ((ByteBuffer) buffer.duplicate().position(2)).get(buf); |
| return buf; |
| } |
| |
| public void setSignature (final byte[] signature) |
| { |
| setSignature (signature, 0, signature.length); |
| } |
| |
| public void setSignature (final byte[] signature, final int offset, final int length) |
| { |
| if (alg.equals (SignatureAlgorithm.ANONYMOUS)) |
| return; |
| buffer.putShort (0, (short) length); |
| buffer.position (2); |
| buffer.put (signature, offset, length); |
| } |
| |
| public String toString () |
| { |
| return toString (null); |
| } |
| |
| public String toString (final String prefix) |
| { |
| StringWriter str = new StringWriter(); |
| PrintWriter out = new PrintWriter(str); |
| if (prefix != null) |
| out.print (prefix); |
| out.println("struct {"); |
| if (!alg.equals (SignatureAlgorithm.ANONYMOUS)) |
| { |
| String subprefix = " "; |
| if (prefix != null) |
| subprefix = prefix + subprefix; |
| out.print (Util.hexDump (signature (), subprefix)); |
| } |
| if (prefix != null) |
| out.print (prefix); |
| out.print ("} Signature;"); |
| return str.toString(); |
| } |
| } |