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+/* SecretKeySpec.java -- Wrapper for secret keys.
+ Copyright (C) 2004 Free Software Foundation, Inc.
+
+This file is 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, 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; see the file COPYING. If not, write to the
+Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA
+02111-1307 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 javax.crypto.spec;
+
+import java.security.spec.KeySpec;
+import javax.crypto.SecretKey;
+
+/**
+ * This is a simple wrapper around a raw byte array, for ciphers that do
+ * not require any key parameters other than the bytes themselves.
+ *
+ * <p>Since this class implements {@link javax.crypto.SecretKey}, which
+ * in turn extends {@link java.security.Key}, so instances of this class
+ * may be passed directly to the <code>init()</code> methods of {@link
+ * javax.crypto.Cipher}.
+ *
+ * @see javax.crypto.SecretKey
+ * @see javax.crypto.SecretKeyFactory
+ */
+public class SecretKeySpec implements KeySpec, SecretKey
+{
+
+ // Constants and fields.
+ // ------------------------------------------------------------------------
+
+ /** Compatible with JDK1.4. */
+ private static final long serialVersionUID = 6577238317307289933L;
+
+ /** The key bytes. */
+ private byte[] key;
+
+ /** The algorithm's name. */
+ private String algorithm;
+
+ // Constructors.
+ // ------------------------------------------------------------------------
+
+ /**
+ * Create a new secret key spec from an entire byte array.
+ *
+ * @param key The key material.
+ * @param algorithm The name of the algorithm using this key.
+ */
+ public SecretKeySpec(byte[] key, String algorithm)
+ {
+ this(key, 0, key.length, algorithm);
+ }
+
+ /**
+ * Create a new secret key spec from part of a byte array.
+ *
+ * @param key The key material.
+ * @param off The offset at which key material begins.
+ * @param len The length of key material.
+ * @param algorithm The name of the algorithm using this key.
+ */
+ public SecretKeySpec(byte[] key, int off, int len, String algorithm)
+ {
+ this.key = new byte[len];
+ this.algorithm = algorithm;
+ System.arraycopy(key, off, this.key, 0, len);
+ }
+
+ // Instance methods.
+ // ------------------------------------------------------------------------
+
+ /**
+ * Return the name of the algorithm associated with this secret key.
+ *
+ * @return The algorithm's name.
+ */
+ public String getAlgorithm()
+ {
+ return algorithm;
+ }
+
+ /**
+ * Return the key as a byte array.
+ *
+ * @return The key material.
+ */
+ public byte[] getEncoded()
+ {
+ return key;
+ }
+
+ /**
+ * This key's format, which is always "RAW".
+ *
+ * @return "RAW"
+ */
+ public String getFormat()
+ {
+ return "RAW";
+ }
+
+ public boolean equals(Object o)
+ {
+ byte[] okey = ((SecretKeySpec) o).getEncoded();
+ if (key.length != okey.length) return false;
+ for (int i = 0; i < key.length; i++)
+ {
+ if (key[i] != okey[i])
+ return false;
+ }
+ return algorithm.equals(((SecretKeySpec) o).getAlgorithm());
+ }
+
+ public int hashCode()
+ {
+ int code = 0;
+ for (int i = 0; i < key.length; i++)
+ {
+ code ^= (key[i] & 0xff) << (i << 3 & 31);
+ }
+ return code ^ algorithm.hashCode();
+ }
+}