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1 files changed, 220 insertions, 0 deletions

diff --git a/libjava/classpath/javax/crypto/spec/DESKeySpec.java b/libjava/classpath/javax/crypto/spec/DESKeySpec.java
new file mode 100644
index 000000000..9075a77d2
--- /dev/null
+++ b/libjava/classpath/javax/crypto/spec/DESKeySpec.java
@@ -0,0 +1,220 @@
+/* DESKeySpec -- Keys for DES.
+   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., 51 Franklin Street, 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 javax.crypto.spec;
+
+import java.security.InvalidKeyException;
+import java.security.spec.KeySpec;
+
+/**
+ * This class is a transparent wrapper for DES keys, which are arrays
+ * of 8 bytes.
+ *
+ * @author Casey Marshall (csm@gnu.org)
+ * @since 1.4
+ */
+public class DESKeySpec implements KeySpec
+{
+
+  // Constants.
+  // ------------------------------------------------------------------------
+
+  /**
+   * The length of a DES key, in bytes.
+   */
+  public static final int DES_KEY_LEN = 8;
+
+  /**
+   * The key bytes.
+   */
+  private byte[] key;
+
+  // Constructors.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Create a new DES key spec, copying the first 8 bytes from the
+   * byte array.
+   *
+   * @param key The key bytes.
+   * @throws java.security.InvalidKeyException If there are less than 8
+   *         bytes in the array.
+   */
+  public DESKeySpec(byte[] key) throws InvalidKeyException
+  {
+    this(key, 0);
+  }
+
+  /**
+   * Create a new DES key spec, starting at <code>offset</code> in
+   * the byte array. The first 8 bytes starting at <code>offset</code>
+   * are copied.
+   *
+   * @param key    The key bytes.
+   * @param offset The offset into the byte array at which to begin.
+   * @throws java.security.InvalidKeyException If there are less than 8
+   *         bytes starting at <code>offset</code>.
+   */
+  public DESKeySpec(byte[] key, int offset) throws InvalidKeyException
+  {
+    if (key.length - offset < DES_KEY_LEN)
+      {
+        throw new InvalidKeyException("DES keys must be 8 bytes long");
+      }
+    this.key = new byte[DES_KEY_LEN];
+    System.arraycopy(key, offset, this.key, 0, DES_KEY_LEN);
+  }
+
+  // Class methods.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Returns whether or not the given key is <i>parity adjusted</i>;
+   * i.e. every byte in the key has an odd number of "1" bits.
+   *
+   * @param key    The key bytes, considered between <code>[offset,
+   *               offset+7]</code>
+   * @param offset The offset into the byte array at which to begin.
+   * @return True if all bytes have an odd number of "1" bits.
+   * @throws java.security.InvalidKeyException If there are not enough
+   *         bytes in the array.
+   */
+  public static boolean isParityAdjusted(byte[] key, int offset)
+    throws InvalidKeyException
+  {
+    if (key.length - offset < DES_KEY_LEN)
+      {
+        throw new InvalidKeyException("DES keys must be 8 bytes long");
+      }
+    boolean parity = false;
+    boolean oddbits = false;
+    for (int i = 0; i < DES_KEY_LEN; i++)
+      {
+        oddbits = false;
+        for (int j = 0; j < 8; j++)
+          {
+            oddbits ^= (key[i+offset] & 1 << j) != 0;
+          }
+        parity &= oddbits;
+      }
+    return parity;
+  }
+
+  /**
+   * One-half of the weak and semiweak DES keys (the other half are the
+   * complements of these).
+   */
+  private static final byte[][] WEAK_KEYS = new byte[][] {
+    {   0,   0,   0,   0,   0,   0,   0,   0 }, // 0000 0000 0000 0000
+    {  -1,  -1,  -1,  -1,   0,   0,   0,   0 }, // ffff ffff 0000 0000
+    {   1,   1,   1,   1,   1,   1,   1,   1 }, // 0101 0101 0101 0101
+    {  31,  31,  31,  31,  14,  14,  14,  14 }, // 1f1f 1f1f 0e0e 0e0e
+    {   1,  -2,   1,  -2,   1,  -2,   1,  -2 }, // 01fe 01fe 01fe 01fe
+    {  31, -32,  31, -32, -32,  31, -32,  31 }, // 1fe0 1fe0 0e1f 0e1f
+    {   1, -32,   1, -32,   1, -15,   1, -15 }, // 01e0 01e0 01f1 01f1
+    {  31,  -2,  31,  -2,  14,  -2,  14,  -2 }, // 1ffe 1ffe 0efe 0efe
+    {   1,  31,   1,  31,   1,  14,   1,  14 }, // 011f 011f 010e 010e
+    { -32,  -2, -32,  -2, -15,  -2, -15,  -2 }, // e0fe e0fe f1fe f1fe
+  };
+
+  /**
+   * Tests if the bytes between <code>[offset, offset+7]</code>
+   * constitute a weak or semi-weak DES key.
+   *
+   * @param key    The key bytes to check.
+   * @param offset The offset in the byte array to start.
+   * @return true If the key bytes are a weak key.
+   */
+  public static boolean isWeak(byte[] key, int offset)
+    throws InvalidKeyException
+  {
+    if (key.length - offset < DES_KEY_LEN)
+      {
+        throw new InvalidKeyException("DES keys must be 8 bytes long");
+      }
+    for (int i = 0; i < WEAK_KEYS.length; i++)
+      {
+        if (equalsOrComplementEquals(key, offset, WEAK_KEYS[i]))
+          {
+            return true;
+          }
+      }
+    return false;
+  }
+
+  /**
+   * This method returns true if the first 8 bytes starting at
+   * <code>off</code> in <code>a</code> equal the first 8 bytes in
+   * <code>b</code>, or equal the <i>complement</i> of the first 8 bytes
+   * in <code>b</code>.
+   *
+   * @param a   The first byte array.
+   * @param off The index into the first byte array.
+   * @param b   The second byte array.
+   * @return <code>a == b || a == ~b</code>
+   */
+  private static boolean equalsOrComplementEquals(byte[] a, int off, byte[] b)
+  {
+    boolean result = true;
+    for (int i = 0; i < DES_KEY_LEN; i++)
+      {
+        result &= a[off+i] == b[i];
+      }
+    if (result) return true;
+    result = true;
+    for (int i = 0; i < DES_KEY_LEN; i++)
+      {
+        result &= a[off+i] == (~b[i]);
+      }
+    return result;
+  }
+
+  // Instance methods.
+  // ------------------------------------------------------------------------
+
+  /**
+   * Return the key as a byte array. This method does not copy the byte
+   * array.
+   *
+   * @return The key bytes.
+   */
+  public byte[] getKey()
+  {
+    return key;
+  }
+}