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Diffstat (limited to 'libjava/gnu/java/security/der/DERWriter.java')
| -rw-r--r-- | libjava/gnu/java/security/der/DERWriter.java | 324 |
1 files changed, 324 insertions, 0 deletions
diff --git a/libjava/gnu/java/security/der/DERWriter.java b/libjava/gnu/java/security/der/DERWriter.java new file mode 100644 index 00000000000..ec3e3df339d --- /dev/null +++ b/libjava/gnu/java/security/der/DERWriter.java @@ -0,0 +1,324 @@ +/* DERWriter.java -- write Java types in DER format. + Copyright (C) 2003 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.der; + +import java.io.ByteArrayOutputStream; +import java.io.IOException; +import java.io.OutputStream; + +import java.math.BigInteger; + +import java.nio.ByteBuffer; +import java.nio.CharBuffer; +import java.nio.charset.Charset; +import java.nio.charset.CharsetEncoder; + +import java.text.SimpleDateFormat; + +import java.util.BitSet; +import java.util.Date; +import java.util.Iterator; +import java.util.List; +import java.util.Set; +import java.util.TimeZone; + +import gnu.java.security.OID; + +/** + * Methods that allow various Java types to be written as a DER + * (Distinguished Encoding Rules) stream to the specified output stream. + * DER is used to encode ASN.1 constructions, but this class provides no + * methods for interacting with ASN.1. Rather, callers should construct + * their output objects properly for whatever ASN.1 construct is being + * output. + * + * <p>This class only defines static methods; there are no instance + * variables needed. + * + * @author Casey Marshall (rsdio@metastatic.org) + */ +public class DERWriter implements DER +{ + + // Constructors. + // ------------------------------------------------------------------------ + + /** This class only has static methods. */ + private DERWriter() + { + } + + // Class methods. + // ------------------------------------------------------------------------ + + public static int write(OutputStream out, DERValue object) + throws IOException + { + out.write(object.getExternalTag()); + Object value = object.getValue(); + if (value == null) + { + writeLength(out, 0); + return 0; + } + if (value instanceof Boolean) + return writeBoolean(out, (Boolean) value); + else if (value instanceof BigInteger) + return writeInteger(out, (BigInteger) value); + else if (value instanceof Date) + return writeDate(out, object.getExternalTag(), (Date) value); + else if (value instanceof String) + return writeString(out, object.getExternalTag(), (String) value); + else if (value instanceof List) + return writeSequence(out, (List) value); + else if (value instanceof Set) + return writeSet(out, (Set) value); + else if (value instanceof BitString) + return writeBitString(out, (BitString) value); + else if (value instanceof OID) + return writeOID(out, (OID) value); + else if (value instanceof byte[]) + { + writeLength(out, ((byte[]) value).length); + out.write((byte[]) value); + return ((byte[]) value).length; + } + else if (value instanceof DERValue) + { + ByteArrayOutputStream bout = new ByteArrayOutputStream(); + write(bout, (DERValue) value); + byte[] buf = bout.toByteArray(); + writeLength(out, buf.length); + out.write(buf); + return buf.length; + } + else + throw new DEREncodingException("cannot encode " + value.getClass().getName()); + } + + public static int definiteEncodingSize(int length) + { + if (length < 128) + return 1; + else if (length < 256) + return 2; + else if (length < 65536) + return 3; + else if (length < 16777216) + return 4; + else + return 5; + } + + // Own methods. + // ------------------------------------------------------------------------ + + /** + * Write a BOOLEAN type to the given output stream. + * + * @param out The sink output stream. + * @param b The boolean value to write. + */ + private static int writeBoolean(OutputStream out, Boolean b) + throws IOException + { + writeLength(out, 1); + if (b.booleanValue()) + out.write(0xFF); + else + out.write(0); + return 1; + } + + /** + * Write an INTEGER type to the given output stream. + * + * @param out The sink output stream. + * @param integer The integer to write. + */ + private static int writeInteger(OutputStream out, BigInteger integer) + throws IOException + { + byte[] bytes = integer.toByteArray(); + writeLength(out, bytes.length); + out.write(bytes); + return bytes.length; + } + + private static int writeSequence(OutputStream out, List sequence) + throws IOException + { + ByteArrayOutputStream bout = new ByteArrayOutputStream(); + for (Iterator i = sequence.iterator(); i.hasNext(); ) + { + write(bout, (DERValue) i.next()); + } + byte[] buf = bout.toByteArray(); + writeLength(out, buf.length); + out.write(buf); + return buf.length; + } + + private static int writeSet(OutputStream out, Set set) + throws IOException + { + ByteArrayOutputStream bout = new ByteArrayOutputStream(); + for (Iterator i = set.iterator(); i.hasNext(); ) + { + write(bout, (DERValue) i.next()); + } + byte[] buf = bout.toByteArray(); + writeLength(out, buf.length); + out.write(buf); + return buf.length; + } + + private static int writeOID(OutputStream out, OID oid) + throws IOException + { + byte[] der = oid.getDER(); + writeLength(out, der.length); + out.write(der); + return der.length; + } + + private static int writeBitString(OutputStream out, BitString bs) + throws IOException + { + byte[] buf = bs.getShiftedByteArray(); + out.write(buf.length + 1); + out.write(bs.getIgnoredBits()); + out.write(buf); + return buf.length; + } + + private static int writeString(OutputStream out, int tag, String str) + throws IOException + { + Charset charset = null; + byte[] b = null; + switch (tag & 0x1F) + { + case NUMERIC_STRING: + case PRINTABLE_STRING: + case T61_STRING: + case VIDEOTEX_STRING: + case IA5_STRING: + case GRAPHIC_STRING: + case ISO646_STRING: + case GENERAL_STRING: + charset = Charset.forName("ISO-8859-1"); + break; + case UNIVERSAL_STRING: + case BMP_STRING: + charset = Charset.forName("UTF-16BE"); + break; + case UTF8_STRING: + default: + charset = Charset.forName("UTF-8"); + break; + } + if (charset == null) + throw new DEREncodingException("no charset"); + CharsetEncoder encoder = charset.newEncoder(); + ByteBuffer result = encoder.encode(CharBuffer.wrap(str)); + if (result.hasArray()) + { + b = result.array(); + } + else + { + b = new byte[result.remaining()]; + result.get(b); + } + writeLength(out, b.length); + out.write(b); + return b.length; + } + + private static int writeDate(OutputStream out, int tag, Date date) + throws IOException + { + SimpleDateFormat sdf = null; + if ((tag & 0x1F) == UTC_TIME) + sdf = new SimpleDateFormat("yyMMddHHmmss'Z'"); + else + sdf = new SimpleDateFormat("yyyyMMddHHmmss'.'SSS'Z'"); + sdf.setTimeZone(TimeZone.getTimeZone("UTC")); + byte[] b = sdf.format(date).getBytes("ISO-8859-1"); + writeLength(out, b.length); + out.write(b); + return b.length; + } + + // Package method. + // ------------------------------------------------------------------------ + + static void writeLength(OutputStream out, int len) throws IOException + { + if (len < 128) + out.write(len); + else if (len < 256) + { + out.write(0x81); + out.write(len); + } + else if (len < 65536) + { + out.write(0x82); + out.write(len >> 8); + out.write(len); + } + else if (len < 16777216) + { + out.write(0x83); + out.write(len >> 16); + out.write(len >> 8); + out.write(len); + } + else + { + out.write(0x84); + out.write(len >> 24); + out.write(len >> 16); + out.write(len >> 8); + out.write(len); + } + } +} |
