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Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/javax/crypto/key/dh/GnuDHKey.java')
| -rw-r--r-- | gcc-4.4.3/libjava/classpath/gnu/javax/crypto/key/dh/GnuDHKey.java | 174 |
1 files changed, 174 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/key/dh/GnuDHKey.java b/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/key/dh/GnuDHKey.java new file mode 100644 index 000000000..1066830c3 --- /dev/null +++ b/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/key/dh/GnuDHKey.java @@ -0,0 +1,174 @@ +/* GnuDHKey.java -- + Copyright (C) 2003, 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.crypto.key.dh; + +import gnu.java.security.Registry; +import gnu.java.security.action.GetPropertyAction; +import gnu.java.security.util.FormatUtil; + +import java.math.BigInteger; +import java.security.AccessController; +import java.security.Key; + +import javax.crypto.interfaces.DHKey; +import javax.crypto.spec.DHParameterSpec; + +/** + * A base asbtract class for both public and private Diffie-Hellman keys. It + * encapsulates the two DH numbers: <code>p</code>, and <code>g</code>. + * <p> + * According to the JDK, cryptographic <i>Keys</i> all have a <i>format</i>. + * The format used in this implementation is called <i>Raw</i>, and basically + * consists of the raw byte sequences of algorithm parameters. The exact order + * of the byte sequences and the implementation details are given in each of the + * relevant <code>getEncoded()</code> methods of each of the private and + * public keys. + * <p> + * Reference: + * <ol> + * <li><a href="http://www.ietf.org/rfc/rfc2631.txt">Diffie-Hellman Key + * Agreement Method</a><br> + * Eric Rescorla.</li> + * </ol> + */ +public abstract class GnuDHKey + implements Key, DHKey +{ + /** The public prime q. A prime divisor of p-1. */ + protected BigInteger q; + /** The public prime p. */ + protected BigInteger p; + /** The generator g. */ + protected BigInteger g; + /** + * Identifier of the default encoding format to use when externalizing the key + * material. + */ + protected final int defaultFormat; + /** String representation of this key. Cached for speed. */ + private transient String str; + + /** + * Trivial protected constructor. + * + * @param defaultFormat the identifier of the encoding format to use by + * default when externalizing the key. + * @param q a prime divisor of p-1. + * @param p the public prime. + * @param g the generator of the group. + */ + protected GnuDHKey(int defaultFormat, BigInteger q, BigInteger p, BigInteger g) + { + super(); + + this.defaultFormat = defaultFormat <= 0 ? Registry.RAW_ENCODING_ID + : defaultFormat; + this.q = q; + this.p = p; + this.g = g; + } + + public DHParameterSpec getParams() + { + if (q == null) + return new DHParameterSpec(p, g); + return new DHParameterSpec(p, g, q.bitLength()); + } + + public String getAlgorithm() + { + return Registry.DH_KPG; + } + + /** @deprecated see getEncoded(int). */ + public byte[] getEncoded() + { + return getEncoded(defaultFormat); + } + + public String getFormat() + { + return FormatUtil.getEncodingShortName(defaultFormat); + } + + public BigInteger getQ() + { + return q; + } + + /** + * Returns <code>true</code> if the designated object is an instance of + * {@link DHKey} and has the same Diffie-Hellman parameter values as this one. + * + * @param obj the other non-null DH key to compare to. + * @return <code>true</code> if the designated object is of the same type + * and value as this one. + */ + public boolean equals(Object obj) + { + if (obj == null) + return false; + if (! (obj instanceof DHKey)) + return false; + DHKey that = (DHKey) obj; + return p.equals(that.getParams().getP()) + && g.equals(that.getParams().getG()); + } + + public String toString() + { + if (str == null) + { + String ls = (String) AccessController.doPrivileged + (new GetPropertyAction("line.separator")); + StringBuilder sb = new StringBuilder(ls) + .append("defaultFormat=").append(defaultFormat).append(",").append(ls); + if (q == null) + sb.append("q=null,"); + else + sb.append("q=0x").append(q.toString(16)).append(","); + sb.append(ls).append("p=0x").append(p.toString(16)).append(",").append(ls) + .append("g=0x").append(g.toString(16)); + str = sb.toString(); + } + return str; + } + + public abstract byte[] getEncoded(int format); +} |