1 files changed, 142 insertions, 0 deletions
diff --git a/libjava/gnu/java/security/provider/DERWriter.java b/libjava/gnu/java/security/provider/DERWriter.java
new file mode 100644
index 00000000000..4add1191e06
--- /dev/null
+++ b/libjava/gnu/java/security/provider/DERWriter.java
@@ -0,0 +1,142 @@
+/* DERWriter.java
+   Copyright (C) 1999 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 gnu.java.security.provider;
+
+import java.math.BigInteger;
+
+public class DERWriter
+{
+  static final int UNIVERSAL = 1;
+  static final int APPLICATION = 2;
+  static final int CONTEXT_SPECIFIC = 3;
+  static final int PRIVATE = 4;
+
+  public DERWriter()
+  {}
+
+  public byte[] writeBigInteger( BigInteger i)
+  {
+    return writePrimitive( 0x02, UNIVERSAL, (int)Math.ceil((double)i.bitLength() / 8), i.toByteArray() );
+  }
+
+  private byte[] writePrimitive( int identifier, int identifierencoding,
+				 int length, byte contents[])
+  {
+    return joinarrays( generateIdentifier( identifier, identifierencoding ), generateLength( length ), contents);
+  }
+
+  public byte[] joinarrays( byte a[], byte b[])
+  {
+    byte d[] = new byte[ a.length + b.length];
+    System.arraycopy( a, 0, d, 0, a.length);
+    System.arraycopy( b, 0, d, a.length, b.length);
+    return d;
+  }
+
+  public byte[] joinarrays( byte a[], byte b[], byte c[])
+  {
+    byte d[] = new byte[ a.length + b.length + c.length];
+    System.arraycopy( a, 0, d, 0, a.length);
+    System.arraycopy( b, 0, d, a.length, b.length);
+    System.arraycopy( c, 0, d, a.length + b.length, c.length);
+    return d;
+  }
+
+  private byte[] generateIdentifier(int identifier, 
+				    int identifierencoding)
+  {
+    byte b[];
+    if( identifier > 31 ) {
+      int count = (int)(Math.log( identifier ) / Math.log( 256 ));
+      b = new byte[ count + 1 ];
+      b[0] = (byte)(translateLeadIdentifierByte(identifierencoding) 
+		    | 0x1f);
+      int i;
+      for( i = 1; i < (count + 1); i++) {
+	b[i] = (byte)(0x7f & ( identifier >> (7 * (count - i)) ));
+	b[i] |= 0x80;
+      }
+      b[i - 1] ^= 0x80;
+      //System.out.println("Identifier1: " + b[0]);
+      return b;
+    } else {
+      b = new byte[1];
+      b[0] = (byte)((translateLeadIdentifierByte(identifierencoding)
+		     | (byte)( identifier & 0x1f )) & 0xdf);
+      //System.out.println("Identifier2: " + b[0]);
+      return b;
+    }
+  }
+
+  private byte translateLeadIdentifierByte(int b)
+  {
+    if( b == UNIVERSAL)
+      return (byte)0x3f;
+    else if( b == APPLICATION)
+      return (byte)0x7f;
+    else if( b == CONTEXT_SPECIFIC)
+      return (byte)0xbf;
+    else 
+      return (byte)0xC0;
+  }
+
+  private byte[] generateLength( int length )
+  {
+    byte b[];
+    if( length > 127 ) {
+      int count = (int)Math.ceil(Math.log( length ) / Math.log( 256 ));
+      //System.out.println("Length byte count: " + count);
+      b = new byte[ count + 1 ];
+      b[0] = (byte)((count & 0x7f) | 0x80);
+      for( int i = 1; i < (count + 1); i++) {
+	b[i] = (byte)( length >>> (8 * ( count - i) ));
+	//System.out.println("Length1 byte1: " + (length >>> (8 * ( count - i) )));
+	//System.out.println("Length1 byte2: " + b[i]);
+      }
+
+      //System.out.println("Length1: " + length);
+      return b;
+    } else {
+      b = new byte[1];
+      b[0] = (byte)( length & 0x7f );
+      //System.out.println("Length2: " + length);
+      return b;
+    }
+  }
+}