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authorupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
committerupstream source tree <ports@midipix.org>2015-03-15 20:14:05 -0400
commit554fd8c5195424bdbcabf5de30fdc183aba391bd (patch)
tree976dc5ab7fddf506dadce60ae936f43f58787092 /libjava/classpath/gnu/javax/net/ssl/provider/SSLHMac.java
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+/* SSLHMac.java -- SSLv3's MAC algorithm.
+ Copyright (C) 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.net.ssl.provider;
+
+import java.util.Arrays;
+import java.util.Map;
+
+import gnu.java.security.hash.HashFactory;
+import gnu.java.security.hash.IMessageDigest;
+import gnu.javax.crypto.mac.IMac;
+
+/**
+ * The MAC function in SSLv3. This mac is defined as:
+ *
+ * <pre>
+ * hash(MAC_write_secret, pad_2 +
+ * hash(MAC_write_secret + pad_1 + data));</pre>
+ *
+ * <p><tt>hash</tt> is e.g. MD5 or SHA-1, <tt>pad_1</tt> is the value
+ * 0x36 48 times for MD5 and 40 times for SHA-1, and <tt>pad_2</tt> is
+ * the value 0x5c repeated similarly.
+ */
+class SSLHMac implements IMac, Cloneable
+{
+
+ // Fields.
+ // -------------------------------------------------------------------------
+
+ static final byte PAD1 = 0x36;
+ static final byte PAD2 = 0x5c;
+
+ protected IMessageDigest md;
+ protected byte[] key;
+ protected final byte[] pad1, pad2;
+
+ // Constructors.
+ // -------------------------------------------------------------------------
+
+ SSLHMac(String mdName)
+ {
+ super();
+ this.md = HashFactory.getInstance(mdName);
+ if (mdName.equalsIgnoreCase("MD5"))
+ {
+ pad1 = new byte[48];
+ pad2 = new byte[48];
+ }
+ else
+ {
+ pad1 = new byte[40];
+ pad2 = new byte[40];
+ }
+ Arrays.fill(pad1, PAD1);
+ Arrays.fill(pad2, PAD2);
+ }
+
+ // Instance methods.
+ // -------------------------------------------------------------------------
+
+ public Object clone()
+ {
+ try
+ {
+ return super.clone();
+ }
+ catch (CloneNotSupportedException cnse)
+ {
+ throw new Error();
+ }
+ }
+
+ public String name()
+ {
+ return "SSLHMac-" + md.name();
+ }
+
+ public int macSize()
+ {
+ return md.hashSize();
+ }
+
+ public void init(Map attributes)
+ {
+ key = (byte[]) attributes.get(MAC_KEY_MATERIAL);
+ if (key == null)
+ throw new NullPointerException();
+ reset();
+ }
+
+ public void reset()
+ {
+ md.reset();
+ md.update(key, 0, key.length);
+ md.update(pad1, 0, pad1.length);
+ }
+
+ public byte[] digest()
+ {
+ byte[] h1 = md.digest();
+ md.update(key, 0, key.length);
+ md.update(pad2, 0, pad2.length);
+ md.update(h1, 0, h1.length);
+ byte[] result = md.digest();
+ reset();
+ return result;
+ }
+
+ public void update(byte b)
+ {
+ md.update(b);
+ }
+
+ public void update(byte[] buf, int off, int len)
+ {
+ md.update(buf, off, len);
+ }
+
+ public boolean selfTest()
+ {
+ return true; // XXX
+ }
+}