2 Copyright 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
35 obligated to do so. If you do not wish to do so, delete this
36 exception statement from your version. */
39 package gnu.java.security.key.rsa;
41 import gnu.java.lang.CPStringBuilder;
43 import gnu.java.security.Registry;
44 import gnu.java.security.action.GetPropertyAction;
45 import gnu.java.security.util.FormatUtil;
47 import java.math.BigInteger;
48 import java.security.AccessController;
49 import java.security.Key;
50 import java.security.interfaces.RSAKey;
53 * A base asbtract class for both public and private RSA keys.
55 public abstract class GnuRSAKey
56 implements Key, RSAKey
58 /** The public modulus of an RSA key pair. */
59 private final BigInteger n;
61 /** The public exponent of an RSA key pair. */
62 private final BigInteger e;
65 * Identifier of the default encoding format to use when externalizing the key
68 protected final int defaultFormat;
70 /** String representation of this key. Cached for speed. */
71 private transient String str;
74 * Trivial protected constructor.
76 * @param defaultFormat the identifier of the encoding format to use by
77 * default when externalizing the key.
78 * @param n the public modulus <code>n</code>.
79 * @param e the public exponent <code>e</code>.
81 protected GnuRSAKey(int defaultFormat, BigInteger n, BigInteger e)
85 this.defaultFormat = defaultFormat <= 0 ? Registry.RAW_ENCODING_ID
91 public BigInteger getModulus()
96 public String getAlgorithm()
98 return Registry.RSA_KPG;
101 /** @deprecated see getEncoded(int). */
102 public byte[] getEncoded()
104 return getEncoded(defaultFormat);
107 public String getFormat()
109 return FormatUtil.getEncodingShortName(defaultFormat);
113 * Returns the modulus <code>n</code>.
115 * @return the modulus <code>n</code>.
117 public BigInteger getN()
123 * Returns the public exponent <code>e</code>.
125 * @return the public exponent <code>e</code>.
127 public BigInteger getPublicExponent()
133 * Same as {@link #getPublicExponent()}.
135 * @return the public exponent <code>e</code>.
137 public BigInteger getE()
143 * Returns <code>true</code> if the designated object is an instance of
144 * {@link RSAKey} and has the same RSA parameter values as this one.
146 * @param obj the other non-null RSA key to compare to.
147 * @return <code>true</code> if the designated object is of the same type
148 * and value as this one.
150 public boolean equals(final Object obj)
155 if (! (obj instanceof RSAKey))
158 final RSAKey that = (RSAKey) obj;
159 return n.equals(that.getModulus());
162 public String toString()
166 String ls = (String) AccessController.doPrivileged
167 (new GetPropertyAction("line.separator"));
168 str = new CPStringBuilder(ls)
169 .append("defaultFormat=").append(defaultFormat).append(",").append(ls)
170 .append("n=0x").append(n.toString(16)).append(",").append(ls)
171 .append("e=0x").append(e.toString(16))
177 public abstract byte[] getEncoded(int format);