content: /*
   * © 2017 AgNO3 Gmbh & Co. KG
   * 
   * This library 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 2.1 of the License, or (at your option) any later version.
   * 
   * This library 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 this library; if not, write to the Free Software
   * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
   */
  package jcifs.internal.smb2.nego;
  
  
  import jcifs.Configuration;
  import jcifs.internal.SMBProtocolDecodingException;
  import jcifs.internal.util.SMBUtil;
  
  
  /**
   * @author mbechler
   *
   */
  public class EncryptionNegotiateContext implements NegotiateContextRequest, NegotiateContextResponse {
  
      /**
       * Context type
       */
      public static final int NEGO_CTX_ENC_TYPE = 0x2;
  
      /**
       * AES 128 CCM
       */
      public static final int CIPHER_AES128_CCM = 0x1;
  
      /**
       * AES 128 GCM
       */
      public static final int CIPHER_AES128_GCM = 0x2;
  
      private int[] ciphers;
  
  
      /**
       * 
       * @param config
       * @param ciphers
       */
      public EncryptionNegotiateContext ( Configuration config, int ciphers[] ) {
          this.ciphers = ciphers;
      }
  
  
      /**
       * 
       */
      public EncryptionNegotiateContext () {}
  
  
      /**
       * @return the ciphers
       */
      public int[] getCiphers () {
          return this.ciphers;
      }
  
  
      /**
       * {@inheritDoc}
       *
       * @see jcifs.internal.smb2.nego.NegotiateContextRequest#getContextType()
       */
      @Override
      public int getContextType () {
          return NEGO_CTX_ENC_TYPE;
      }
  
  
      /**
       * {@inheritDoc}
       *
       * @see jcifs.Encodable#encode(byte[], int)
       */
      @Override
      public int encode ( byte[] dst, int dstIndex ) {
          int start = dstIndex;
          SMBUtil.writeInt2(this.ciphers != null ? this.ciphers.length : 0, dst, dstIndex);
          dstIndex += 2;
  
          if ( this.ciphers != null ) {
              for ( int cipher : this.ciphers ) {
                  SMBUtil.writeInt2(cipher, dst, dstIndex);
                  dstIndex += 2;
              }
          }
          return dstIndex - start;
      }
  
  
      /**
       * {@inheritDoc}
       *
       * @see jcifs.Decodable#decode(byte[], int, int)
       */
      @Override
      public int decode ( byte[] buffer, int bufferIndex, int len ) throws SMBProtocolDecodingException {
          int start = bufferIndex;
          int nciphers = SMBUtil.readInt2(buffer, bufferIndex);
          bufferIndex += 2;
  
          this.ciphers = new int[nciphers];
          for ( int i = 0; i < nciphers; i++ ) {
              this.ciphers[ i ] = SMBUtil.readInt2(buffer, bufferIndex);
              bufferIndex += 2;
          }
  
          return bufferIndex - start;
      }
  
  
      /**
       * {@inheritDoc}
       *
       * @see jcifs.Encodable#size()
       */
      @Override
      public int size () {
          return 4 + ( this.ciphers != null ? 2 * this.ciphers.length : 0 );
      }
  
  }
  