1 files changed, 139 insertions, 0 deletions
diff --git a/libjava/classpath/gnu/javax/crypto/jce/params/DERReader.java b/libjava/classpath/gnu/javax/crypto/jce/params/DERReader.java
new file mode 100644
index 000000000..9fc1e2cd7
--- /dev/null
+++ b/libjava/classpath/gnu/javax/crypto/jce/params/DERReader.java
@@ -0,0 +1,139 @@
+/* DERReader.java --
+   Copyright (C) 1999, 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.jce.params;
+
+import java.math.BigInteger;
+
+class DERReader
+{
+  byte source[];
+  int pos;
+  static final int UNIVERSAL = 1;
+  static final int APPLICATION = 2;
+  static final int CONTEXT_SPECIFIC = 3;
+  static final int PRIVATE = 4;
+
+  public DERReader()
+  {
+    source = null;
+    pos = 0;
+  }
+
+  public DERReader(byte source[])
+  {
+    init(source);
+  }
+
+  public void init(String source)
+  {
+    init(source.getBytes());
+  }
+
+  public void init(byte source[])
+  {
+    this.source = source;
+    pos = 0;
+  }
+
+  public boolean hasMorePrimitives()
+  {
+    return pos < source.length;
+  }
+
+  public BigInteger getBigInteger() throws DEREncodingException
+  {
+    return new BigInteger(getPrimitive());
+  }
+
+  // Reads Primitive, definite-length method
+  private byte[] getPrimitive() throws DEREncodingException
+  {
+    int tmp = pos;
+    // Read Identifier
+    byte identifier = source[tmp++];
+    if ((0x20 & identifier) != 0)
+      throw new DEREncodingException();
+    int type = translateLeadIdentifierByte(identifier);
+    // get tag
+    int tag = (0x1f & identifier);
+    // get length
+    byte len = source[tmp]; // may be length of length parameter
+    long length = 0x7f & len;
+    int i;
+    if ((0x80 & len) != 0)
+      {
+        len &= 0x7f;
+        // get length here
+        length = 0;
+        for (i = 0; i < len; i++)
+          {
+            tmp++;
+            length <<= 8;
+            length += (source[tmp] < 0) ? (256 + source[tmp]) : source[tmp];
+          }
+        tmp++;
+      }
+    else
+      tmp++;
+
+    byte tmpb[] = new byte[(int) length];
+    System.arraycopy(source, tmp, tmpb, 0, (int) length);
+    pos = (int) (tmp + length);
+    return tmpb;
+  }
+
+  private int translateLeadIdentifierByte(byte b)
+  {
+    if ((0x3f & b) == b)
+      return UNIVERSAL;
+    else if ((0x7f & b) == b)
+      return APPLICATION;
+    else if ((0xbf & b) == b)
+      return CONTEXT_SPECIFIC;
+    else
+      return PRIVATE;
+  }
+
+  private int getIdentifier(int tpos)
+  {
+    while ((0x80 & source[tpos]) != 0)
+      tpos++;
+    return tpos;
+  }
+}