aboutsummaryrefslogtreecommitdiffstats
path: root/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/jce/cipher/AESKeyWrapSpi.java
diff options
context:
space:
mode:
Diffstat (limited to 'gcc-4.4.3/libjava/classpath/gnu/javax/crypto/jce/cipher/AESKeyWrapSpi.java')
-rw-r--r--gcc-4.4.3/libjava/classpath/gnu/javax/crypto/jce/cipher/AESKeyWrapSpi.java88
1 files changed, 88 insertions, 0 deletions
diff --git a/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/jce/cipher/AESKeyWrapSpi.java b/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/jce/cipher/AESKeyWrapSpi.java
new file mode 100644
index 000000000..973f5890b
--- /dev/null
+++ b/gcc-4.4.3/libjava/classpath/gnu/javax/crypto/jce/cipher/AESKeyWrapSpi.java
@@ -0,0 +1,88 @@
+/* AESKeyWrapSpi.java -- Common AES Key Wrapping Algorithm methods
+ Copyright (C) 2006 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 gnu.javax.crypto.jce.cipher;
+
+/**
+ * Base abstract class to group common AES Key Wrapping Algorithm Adapter
+ * methods.
+ */
+abstract class AESKeyWrapSpi
+ extends KeyWrappingAlgorithmAdapter
+{
+ protected AESKeyWrapSpi(String name, int keySize, String supportedMode)
+ {
+ super(name, 16, keySize, supportedMode);
+ }
+
+ /**
+ * AES Key Wrapping algorithms operate on an 8-byte block; a block half the
+ * size of the AES block itself.
+ * <p>
+ * In wrapping, the number of 8-byte output blocks is ALWAYS one block longer
+ * than the input.
+ *
+ * @param inputLength the size of the plain text.
+ * @return the size in bytes of <code>n + 1</code> 8-byte blocks where
+ * <code>n</code> is the smallest number of 8-byte blocks that contain the
+ * designated number of input bytes.
+ */
+ protected int getOutputSizeForWrap(int inputLength)
+ {
+ int n = (inputLength + 7) / 8;
+ return 8 * (n + 1);
+ }
+
+ /**
+ * AES Key Wrapping algorithms operate on an 8-byte block; a block half the
+ * size of the AES block itself.
+ * <p>
+ * In unwrapping, the number of 8-byte output blocks is ALWAYS one block
+ * shorter than the input.
+ *
+ * @param inputLength the size of the cipher text.
+ * @return the size in bytes of <code>n - 1</code> 8-byte blocks where
+ * <code>n</code> is the smallest number of 8-byte blocks that contain the
+ * designated number of input bytes.
+ */
+ protected int getOutputSizeForUnwrap(int inputLength)
+ {
+ int n = (inputLength + 7) / 8;
+ return 8 * (n - 1);
+ }
+}