signaturepacket.java

面向应用的智能安全代理平台和工具包是一个综合网络应用的安全共性需求而设计和实现的一个通用性的网络信息安全应用支撑平台

package au.net.aba.pgp;

/*
 * $Id: SignaturePacket.java,v 1.2 1998/10/19 06:32:42 leachbj Exp $
 * $Author: leachbj $
 *
 * Copyright (C) 1996-1998 Australian Business Access Pty Ltd.
 * All rights reserved.
 * 
 * Use, modification, copying and distribution of this software is subject the
 * terms and conditions of the ABA Public Licence. See the file
 * "PUBLIC_LICENCE" for additional information.
 *
 * If you have not received a copy of the Public Licence, you must destroy all
 * copies of this file immediately. 
 *
 * $Source: /aba/CVSROOT/jdk1.1/src/au.net.aba/pgp/SignaturePacket.java,v $
 * $Revision: 1.2 $
 * $Date: 1998/10/19 06:32:42 $
 * $State: Exp $
 */

import java.io.*;


//
// Signature packet.
//

class SignaturePacket extends Packet
{
	public final static String ident = "$Id: SignaturePacket.java,v 1.2 1998/10/19 06:32:42 leachbj Exp $";

	public byte version;			// PGP version
	public byte mdLength;			// bytes following to include in digest
	public byte classification;		// signature classifiction
	public long timestamp;			// timestamp of digest
	public long id;				// key id
	public byte pkAlgorithm;		// algorithm for public key scheme
	public byte mdAlgorithm;		// algorithm for message digest scheme
	public byte[] mdCheck;			// first two bytes of digest
	public Multiprecision signature;	// signature


	//
	// Construct from an input stream.
	//
	public SignaturePacket (InputStream input)
		throws IOException
	{
		// build packet input stream
		DataInputStream data = buildCipherPacketInputStream (
			input,(byte)0x02,"signature packet expected");

		version = data.readByte ();
		mdLength = data.readByte ();
		classification = data.readByte ();
		timestamp = data.readUnsignedShort () << 16;
		timestamp |= data.readUnsignedShort ();
		id = data.readLong ();
		pkAlgorithm = data.readByte ();
		mdAlgorithm = data.readByte ();
		mdCheck = new byte[2];
		data.readFully (mdCheck);
		signature = new Multiprecision (data);
	}
}