Examples of org.vngx.jsch.hash.MAC

org.vngx.jsch.hash.MAC
.ietf.org/html/rfc4253#section-6.4">RFC 4253 - The Secure Shell (SSH) Transport Layer Protocol: Data Integrity

RFC 2104 - HMAC: Keyed- Hashing for Message Authentication

Note: Implementations may not be thread-safe and should be externally synchronized.

Note: Instances should be created using the {@code HashManager} factory.
@see org.vngx.jsch.hash.HashManager @author Michael Laudati

   * randomly generated and stored with the host value to hash hosts during
   * matching.
   */
  private void generateHash() throws JSchException {
    // Create random salt for session
    MAC macsha1 = getMAC();
    _salt = new byte[macsha1.getBlockSize()];
    getRandom().fill(_salt, 0, _salt.length);


    try {  // Create the hashed host using salt and MAC-SHA1
      synchronized( macsha1 ) {  // MAC is not thread-safe
        macsha1.init(_salt);
        byte[] hostBytes = Util.str2byte(_host);
        macsha1.update(hostBytes, 0, hostBytes.length);
        _hashedHost = new byte[macsha1.getBlockSize()];
        macsha1.doFinal(_hashedHost, 0);
      }
    } catch(Exception e) {
      throw new JSchException("Failed to create HashedHostKey: " + e, e);
    }

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   * @return true if specified host matches key
   */
  @Override
  public boolean isMatched(String host) {
    try {
      MAC macsha1 = getMAC();
      synchronized( macsha1 ) {  // MAC is not thread-safe
        macsha1.init(_salt);
        byte[] hostBytes = Util.str2byte(host);
        macsha1.update(hostBytes, 0, hostBytes.length);
        byte[] hashValue = new byte[macsha1.getBlockSize()];
        macsha1.doFinal(hashValue, 0);
        return Arrays.equals(_hashedHost, hashValue);
      }
    } catch(Exception e) {
      throw new IllegalStateException("Failed to check HashedHostKey isMatched(): "+e, e);
    }

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      throw new JSchException("Inbound packet is corrupt: "+msg, reasonCode);
    }


    // Finish reading in the rest of the data from the Session's in stream
    // which needs to be discarded.
    MAC discardMac = packetLength != Packet.MAX_SIZE ? _readMac : null;
    discard -= buffer.index;
    while( discard > 0 ) {
      buffer.reset();
      int len = Math.min(discard, buffer.buffer.length);
      getByte(buffer.buffer, 0, len);
      if( discardMac != null ) {
        discardMac.update(buffer.buffer, 0, len);
      }
      discard -= len;
    }
    if( discardMac != null ) {
      discardMac.doFinal(buffer.buffer, 0);
    }
    throw new JSchException("Inbound packet is corrupt: "+msg, reasonCode);
  }

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Related Classes of org.vngx.jsch.hash.MAC

org.vngx.jsch.SessionIO

org.vngx.jsch.util.HashedHostKey

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