Source for gnu.javax.net.ssl.provider.Signature

   1: /* Signature.java -- SSL Signature structure.
   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.BufferedReader;
  42: import java.io.ByteArrayInputStream;
  43: import java.io.DataInputStream;
  44: import java.io.InputStream;
  45: import java.io.IOException;
  46: import java.io.OutputStream;
  47: import java.io.PrintWriter;
  48: import java.io.StringWriter;
  49: 
  50: import java.math.BigInteger;
  51: 
  52: import java.nio.ByteBuffer;
  53: 
  54: import java.security.PublicKey;
  55: import java.security.interfaces.RSAKey;
  56: 
  57: import java.util.Arrays;
  58: 
  59: import gnu.java.security.der.*;
  60: 
  61: /**
  62:  * The signature structure.
  63:  *
  64:  * <pre>
  65: select (SignatureAlgorithm)
  66: {
  67: case anonymous:
  68:   struct { };
  69: case rsa:
  70:   digitally-signed struct
  71:   {
  72:     opaque md5_hash[16];
  73:     opaque sha_hash[20];
  74:   };
  75: case dsa:
  76:   digitally-signed struct
  77:   {
  78:     opaque sha_hash[20];
  79:   };
  80: } Signature;</pre>
  81:  */
  82: public class Signature implements Builder, Constructed
  83: {
  84: 
  85:   // Fields.
  86:   // -------------------------------------------------------------------------
  87: 
  88:   private final ByteBuffer buffer;
  89:   private final SignatureAlgorithm alg;
  90: 
  91:   // Constructor.
  92:   // -------------------------------------------------------------------------
  93: 
  94:   public Signature (final ByteBuffer buffer, final SignatureAlgorithm alg)
  95:   {
  96:     this.buffer = buffer;
  97:     this.alg = alg;
  98:   }
  99:   
 100:   public Signature (final byte[] sigValue, final SignatureAlgorithm alg)
 101:   {
 102:     buffer = ByteBuffer.allocate(sigValue.length + 2);
 103:     buffer.putShort((short) sigValue.length);
 104:     buffer.put(sigValue);
 105:     buffer.position(0);
 106:     this.alg = alg;
 107:   }
 108: 
 109:   // Instance methods.
 110:   // -------------------------------------------------------------------------
 111: 
 112:   public int length ()
 113:   {
 114:     if (alg.equals (SignatureAlgorithm.ANONYMOUS))
 115:       return 0;
 116:     return (buffer.getShort (0) & 0xFFFF) + 2;
 117:   }
 118:   
 119:   public ByteBuffer buffer()
 120:   {
 121:     return (ByteBuffer) buffer.duplicate().limit(length());
 122:   }
 123: 
 124:   public byte[] signature ()
 125:   {
 126:     if (alg.equals (SignatureAlgorithm.ANONYMOUS))
 127:       return new byte[0];
 128:     int length = buffer.getShort (0) & 0xFFFF;
 129:     byte[] buf = new byte[length];
 130:     ((ByteBuffer) buffer.duplicate().position(2)).get(buf);
 131:     return buf;
 132:   }
 133: 
 134:   public void setSignature (final byte[] signature)
 135:   {
 136:     setSignature (signature, 0, signature.length);
 137:   }
 138: 
 139:   public void setSignature (final byte[] signature, final int offset, final int length)
 140:   {
 141:     if (alg.equals (SignatureAlgorithm.ANONYMOUS))
 142:       return;
 143:     buffer.putShort (0, (short) length);
 144:     buffer.position (2);
 145:     buffer.put (signature, offset, length);
 146:   }
 147: 
 148:   public String toString ()
 149:   {
 150:     return toString (null);
 151:   }
 152: 
 153:   public String toString (final String prefix)
 154:   {
 155:     StringWriter str = new StringWriter();
 156:     PrintWriter out = new PrintWriter(str);
 157:     if (prefix != null)
 158:       out.print (prefix);
 159:     out.println("struct {");
 160:     if (!alg.equals (SignatureAlgorithm.ANONYMOUS))
 161:       {
 162:         String subprefix = "  ";
 163:         if (prefix != null)
 164:           subprefix = prefix + subprefix;
 165:         out.print (Util.hexDump (signature (), subprefix));
 166:       }
 167:     if (prefix != null)
 168:       out.print (prefix);
 169:     out.print ("} Signature;");
 170:     return str.toString();
 171:   }
 172: }