Represents the TSTInfo strcture within a time-stamp token (RFC 3161). : Time « Development Class « Java

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2. Development Class
3. Time

Represents the TSTInfo strcture within a time-stamp token (RFC 3161).

     
/*
 * XAdES4j - A Java library for generation and verification of XAdES signatures.
 * Copyright (C) 2010 Luis Goncalves.
 *
 * XAdES4j is free software; you can redistribute it and/or modify it under
 * the terms of the GNU Lesser General Public License as published by the Free
 * Software Foundation; either version 3 of the License, or any later version.
 *
 * XAdES4j 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 Lesser General Public License for more
 * details.
 *
 * You should have received a copy of the GNU Lesser General Public License along
 * with XAdES4j. If not, see <http://www.gnu.org/licenses/>.
 */
//package xades4j.utils;

import java.io.IOException;
import java.math.BigInteger;
import java.util.Date;

import sun.security.util.DerValue;
import sun.security.util.ObjectIdentifier;
import sun.security.x509.AlgorithmId;

/**
 * Represents the TSTInfo strcture within a time-stamp token (RFC 3161). Based
 * on the sun.security.timestamp.TimestampToken class. Copyright 2006 Sun
 * Microsystems, Inc. All rights reserved. author: Vincent Ryan
 * <p>
 * Added getters for fields other than genTime.
 * 
 * @author Lus
 */
public class TimeStampTokenInfo {
  private int version;
  private ObjectIdentifier policy;
  private BigInteger serialNumber;
  private AlgorithmId hashAlgorithm;
  private byte[] hashedMessage;
  private Date genTime;

  /**
   * Constructs an object to store a timestamp token.
   * 
   * @param timestampTokenInfo
   *            a buffer containing the ASN.1 BER encoding of the TSTInfo
   *            element defined in RFC 3161.
   */
  public TimeStampTokenInfo(byte[] timestampTokenInfo) throws IOException {
    if (timestampTokenInfo == null)
      throw new IOException("No timestamp token info");
    parse(timestampTokenInfo);
  }

  /**
   * Extract the date and time from the timestamp token.
   * 
   * @return The date and time when the timestamp was generated.
   */
  public Date getDate() {
    return genTime;
  }

  public AlgorithmId getHashAlgorithm() {
    return hashAlgorithm;
  }

  public byte[] getHashedMessage() {
    return hashedMessage;
  }

  public ObjectIdentifier getPolicy() {
    return policy;
  }

  public BigInteger getSerialNumber() {
    return serialNumber;
  }

  public int getVersion() {
    return version;
  }

  /*
   * Parses the timestamp token info.
   * 
   * @param timestampTokenInfo A buffer containing an ASN.1 BER encoded
   * TSTInfo.
   * 
   * @throws IOException The exception is thrown if a problem is encountered
   * while parsing.
   */
  private void parse(byte[] timestampTokenInfo) throws IOException {

    DerValue tstInfo = new DerValue(timestampTokenInfo);
    if (tstInfo.tag != DerValue.tag_Sequence)
      throw new IOException("Bad encoding for timestamp token info");
    // Parse version
    version = tstInfo.data.getInteger();

    // Parse policy
    policy = tstInfo.data.getOID();

    // Parse messageImprint
    DerValue messageImprint = tstInfo.data.getDerValue();
    hashAlgorithm = AlgorithmId.parse(messageImprint.data.getDerValue());
    hashedMessage = messageImprint.data.getOctetString();

    // Parse serialNumber
    serialNumber = tstInfo.data.getBigInteger();

    // Parse genTime
    genTime = tstInfo.data.getGeneralizedTime();

    // Parse optional elements, if present
    if (tstInfo.data.available() > 0) {
      // Parse accuracy
      // Parse ordering
      // Parse nonce
      // Parse tsa
      // Parse extensions
    }
  }
}

   
    
    
    
    
  

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