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From-SVN: r102074
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Tom Tromey
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349
libjava/classpath/gnu/java/security/der/DERWriter.java
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349
libjava/classpath/gnu/java/security/der/DERWriter.java
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/* DERWriter.java -- write Java types in DER format.
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Copyright (C) 2003, 2004, 2005 Free Software Foundation, Inc.
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This file is part of GNU Classpath.
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GNU Classpath is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2, or (at your option)
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any later version.
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GNU Classpath is distributed in the hope that it will be useful, but
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WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with GNU Classpath; see the file COPYING. If not, write to the
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Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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02110-1301 USA.
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Linking this library statically or dynamically with other modules is
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making a combined work based on this library. Thus, the terms and
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conditions of the GNU General Public License cover the whole
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combination.
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As a special exception, the copyright holders of this library give you
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permission to link this library with independent modules to produce an
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executable, regardless of the license terms of these independent
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modules, and to copy and distribute the resulting executable under
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terms of your choice, provided that you also meet, for each linked
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independent module, the terms and conditions of the license of that
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module. An independent module is a module which is not derived from
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or based on this library. If you modify this library, you may extend
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this exception to your version of the library, but you are not
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obligated to do so. If you do not wish to do so, delete this
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exception statement from your version. */
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package gnu.java.security.der;
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import gnu.java.security.OID;
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import java.io.ByteArrayOutputStream;
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import java.io.IOException;
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import java.io.OutputStream;
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import java.math.BigInteger;
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import java.text.SimpleDateFormat;
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import java.util.Date;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Set;
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import java.util.TimeZone;
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/**
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* Methods that allow various Java types to be written as a DER
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* (Distinguished Encoding Rules) stream to the specified output stream.
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* DER is used to encode ASN.1 constructions, but this class provides no
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* methods for interacting with ASN.1. Rather, callers should construct
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* their output objects properly for whatever ASN.1 construct is being
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* output.
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*
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* <p>This class only defines static methods; there are no instance
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* variables needed.
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*
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* @author Casey Marshall (csm@gnu.org)
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*/
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public class DERWriter implements DER
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{
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// Constructors.
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// ------------------------------------------------------------------------
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/** This class only has static methods. */
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private DERWriter()
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{
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}
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// Class methods.
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// ------------------------------------------------------------------------
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public static int write(OutputStream out, DERValue object)
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throws IOException
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{
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out.write(object.getExternalTag());
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Object value = object.getValue();
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if (value == null)
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{
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writeLength(out, 0);
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return 0;
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}
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if (value instanceof Boolean)
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return writeBoolean(out, (Boolean) value);
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else if (value instanceof BigInteger)
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return writeInteger(out, (BigInteger) value);
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else if (value instanceof Date)
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return writeDate(out, object.getExternalTag(), (Date) value);
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else if (value instanceof String)
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return writeString(out, object.getExternalTag(), (String) value);
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else if (value instanceof List)
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return writeSequence(out, (List) value);
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else if (value instanceof Set)
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return writeSet(out, (Set) value);
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else if (value instanceof BitString)
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return writeBitString(out, (BitString) value);
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else if (value instanceof OID)
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return writeOID(out, (OID) value);
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else if (value instanceof byte[])
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{
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writeLength(out, ((byte[]) value).length);
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out.write((byte[]) value);
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return ((byte[]) value).length;
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}
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else if (value instanceof DERValue)
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{
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ByteArrayOutputStream bout = new ByteArrayOutputStream();
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write(bout, (DERValue) value);
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byte[] buf = bout.toByteArray();
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writeLength(out, buf.length);
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out.write(buf);
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return buf.length;
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}
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else
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throw new DEREncodingException("cannot encode " + value.getClass().getName());
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}
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public static int definiteEncodingSize(int length)
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{
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if (length < 128)
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return 1;
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else if (length < 256)
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return 2;
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else if (length < 65536)
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return 3;
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else if (length < 16777216)
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return 4;
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else
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return 5;
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}
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// Own methods.
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// ------------------------------------------------------------------------
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/**
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* Write a BOOLEAN type to the given output stream.
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*
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* @param out The sink output stream.
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* @param b The boolean value to write.
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*/
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private static int writeBoolean(OutputStream out, Boolean b)
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throws IOException
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{
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writeLength(out, 1);
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if (b.booleanValue())
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out.write(0xFF);
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else
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out.write(0);
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return 1;
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}
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/**
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* Write an INTEGER type to the given output stream.
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*
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* @param out The sink output stream.
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* @param integer The integer to write.
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*/
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private static int writeInteger(OutputStream out, BigInteger integer)
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throws IOException
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{
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byte[] bytes = integer.toByteArray();
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writeLength(out, bytes.length);
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out.write(bytes);
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return bytes.length;
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}
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private static int writeSequence(OutputStream out, List sequence)
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throws IOException
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{
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ByteArrayOutputStream bout = new ByteArrayOutputStream();
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for (Iterator i = sequence.iterator(); i.hasNext(); )
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{
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write(bout, (DERValue) i.next());
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}
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byte[] buf = bout.toByteArray();
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writeLength(out, buf.length);
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out.write(buf);
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return buf.length;
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}
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private static int writeSet(OutputStream out, Set set)
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throws IOException
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{
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ByteArrayOutputStream bout = new ByteArrayOutputStream();
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for (Iterator i = set.iterator(); i.hasNext(); )
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{
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write(bout, (DERValue) i.next());
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}
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byte[] buf = bout.toByteArray();
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writeLength(out, buf.length);
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out.write(buf);
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return buf.length;
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}
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private static int writeOID(OutputStream out, OID oid)
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throws IOException
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{
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byte[] der = oid.getDER();
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writeLength(out, der.length);
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out.write(der);
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return der.length;
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}
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private static int writeBitString(OutputStream out, BitString bs)
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throws IOException
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{
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byte[] buf = bs.getShiftedByteArray();
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out.write(buf.length + 1);
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out.write(bs.getIgnoredBits());
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out.write(buf);
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return buf.length;
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}
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private static int writeString(OutputStream out, int tag, String str)
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throws IOException
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{
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byte[] b = null;
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switch (tag & 0x1F)
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{
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case NUMERIC_STRING:
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case PRINTABLE_STRING:
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case T61_STRING:
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case VIDEOTEX_STRING:
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case IA5_STRING:
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case GRAPHIC_STRING:
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case ISO646_STRING:
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case GENERAL_STRING:
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b = toIso88591(str);
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break;
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case UNIVERSAL_STRING:
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case BMP_STRING:
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b = toUtf16Be(str);
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break;
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case UTF8_STRING:
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default:
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b = toUtf8(str);
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break;
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}
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writeLength(out, b.length);
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out.write(b);
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return b.length;
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}
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private static byte[] toIso88591(String string)
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{
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byte[] result = new byte[string.length()];
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for (int i = 0; i < string.length(); i++)
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result[i] = (byte) string.charAt(i);
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return result;
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}
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private static byte[] toUtf16Be(String string)
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{
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byte[] result = new byte[string.length() * 2];
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for (int i = 0; i < string.length(); i++)
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{
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result[i*2 ] = (byte) ((string.charAt(i) >>> 8) & 0xFF);
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result[i*2+1] = (byte) (string.charAt(i) & 0xFF);
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}
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return result;
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}
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private static byte[] toUtf8(String string)
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{
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ByteArrayOutputStream buf =
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new ByteArrayOutputStream((int)(string.length() * 1.5));
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for (int i = 0; i < string.length(); i++)
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{
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char c = string.charAt(i);
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if (c < 0x0080)
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buf.write(c & 0xFF);
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else if (c < 0x0800)
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{
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buf.write(0xC0 | ((c >>> 6) & 0x3F));
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buf.write(0x80 | (c & 0x3F));
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}
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else
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{
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buf.write(0xE0 | ((c >>> 12) & 0x0F));
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buf.write(0x80 | ((c >>> 6) & 0x3F));
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buf.write(0x80 | (c & 0x3F));
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}
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}
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return buf.toByteArray();
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}
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private static int writeDate(OutputStream out, int tag, Date date)
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throws IOException
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{
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SimpleDateFormat sdf = null;
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if ((tag & 0x1F) == UTC_TIME)
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sdf = new SimpleDateFormat("yyMMddHHmmss'Z'");
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else
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sdf = new SimpleDateFormat("yyyyMMddHHmmss'.'SSS'Z'");
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sdf.setTimeZone(TimeZone.getTimeZone("UTC"));
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byte[] b = sdf.format(date).getBytes("ISO-8859-1");
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writeLength(out, b.length);
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out.write(b);
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return b.length;
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}
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// Package method.
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// ------------------------------------------------------------------------
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static void writeLength(OutputStream out, int len) throws IOException
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{
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if (len < 128)
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out.write(len);
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else if (len < 256)
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{
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out.write(0x81);
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out.write(len);
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}
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else if (len < 65536)
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{
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out.write(0x82);
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out.write(len >> 8);
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out.write(len);
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}
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else if (len < 16777216)
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{
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out.write(0x83);
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out.write(len >> 16);
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out.write(len >> 8);
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out.write(len);
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}
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else
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{
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out.write(0x84);
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out.write(len >> 24);
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out.write(len >> 16);
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out.write(len >> 8);
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out.write(len);
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}
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}
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}
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