1 /* RSAPSSSignatureRawCodec.java --
2 Copyright (C) 2001, 2002, 2003, 2006 Free Software Foundation, Inc.
4 This file is a part of GNU Classpath.
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.
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.
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
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
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
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36 exception statement from your version. */
39 package gnu.java.security.sig.rsa;
41 import gnu.java.security.Registry;
42 import gnu.java.security.sig.ISignatureCodec;
44 import java.io.ByteArrayOutputStream;
47 * <p>An object that implements the {@link gnu.crypto.sig.ISignatureCodec}
48 * operations for the <i>Raw</i> format to use with RSA-PSS signatures.</p>
50 public class RSAPSSSignatureRawCodec implements ISignatureCodec
53 // Constants and variables
54 // -------------------------------------------------------------------------
57 // -------------------------------------------------------------------------
59 // implicit 0-arguments constructor
62 // -------------------------------------------------------------------------
64 // gnu.crypto.keys.IKeyPairCodec interface implementation
65 // -------------------------------------------------------------------------
67 public int getFormatID()
73 * <p>Returns the encoded form of the designated RSA-PSS signature object
74 * according to the <i>Raw</i> format supported by this library.</p>
76 * <p>The <i>Raw</i> format for an RSA-PSS signature, in this implementation,
77 * is a byte sequence consisting of the following:</p>
80 * <li>4-byte magic consisting of the value of the literal
81 * {@link Registry#MAGIC_RAW_RSA_PSS_SIGNATURE},<li>
82 * <li>1-byte version consisting of the constant: 0x01,</li>
83 * <li>4-byte count of following bytes representing the RSA-PSS signature
84 * bytes in internet order,</li>
85 * <li>the RSA-PSS signature bytes in internet order.</li>
88 * @param signature the signature to encode, consisting of the output of the
89 * <code>sign()</code> method of a {@link RSAPSSSignature} instance --a byte
91 * @return the <i>Raw</i> format encoding of the designated signature.
92 * @exception IllegalArgumentException if the designated signature is not an
95 public byte[] encodeSignature(Object signature)
100 buffer = (byte[]) signature;
104 throw new IllegalArgumentException("key");
107 ByteArrayOutputStream baos = new ByteArrayOutputStream();
110 baos.write(Registry.MAGIC_RAW_RSA_PSS_SIGNATURE[0]);
111 baos.write(Registry.MAGIC_RAW_RSA_PSS_SIGNATURE[1]);
112 baos.write(Registry.MAGIC_RAW_RSA_PSS_SIGNATURE[2]);
113 baos.write(Registry.MAGIC_RAW_RSA_PSS_SIGNATURE[3]);
119 int length = buffer.length;
120 baos.write(length >>> 24);
121 baos.write((length >>> 16) & 0xFF);
122 baos.write((length >>> 8) & 0xFF);
123 baos.write(length & 0xFF);
124 baos.write(buffer, 0, length);
126 return baos.toByteArray();
129 public Object decodeSignature(byte[] k)
132 if (k[0] != Registry.MAGIC_RAW_RSA_PSS_SIGNATURE[0]
133 || k[1] != Registry.MAGIC_RAW_RSA_PSS_SIGNATURE[1]
134 || k[2] != Registry.MAGIC_RAW_RSA_PSS_SIGNATURE[2]
135 || k[3] != Registry.MAGIC_RAW_RSA_PSS_SIGNATURE[3])
137 throw new IllegalArgumentException("magic");
143 throw new IllegalArgumentException("version");
150 l = k[i++] << 24 | (k[i++] & 0xFF) << 16 | (k[i++] & 0xFF) << 8
152 byte[] result = new byte[l];
153 System.arraycopy(k, i, result, 0, l);