Package org.vngx.jsch.hash

Examples of org.vngx.jsch.hash.Hash


   * @param kex to use for generating key values
   * @throws JSchException if any errors occur
   */
  void initNewKeys(KeyExchange kex) throws JSchException {
    KexProposal proposal = kex.getKexProposal();
    Hash hash = kex.getKexAlgorithm().getHash();
    byte[] H = kex.getKexAlgorithm().getH();
    byte[] K = kex.getKexAlgorithm().getK();
   
    try {
      // Initial IV client to server:     HASH (K || H || "A" || session_id)
      // Initial IV server to client:     HASH (K || H || "B" || session_id)
      // Encryption key client to server: HASH (K || H || "C" || session_id)
      // Encryption key server to client: HASH (K || H || "D" || session_id)
      // Integrity key client to server:  HASH (K || H || "E" || session_id)
      // Integrity key server to client:  HASH (K || H || "F" || session_id)
      Buffer buffer = new Buffer();
      buffer.putMPInt(K);
      buffer.putBytes(H);
      int letterIndex = buffer.index;
      buffer.putByte((byte) 0x41)// 0x41 = 'A'
      buffer.putBytes(_session.getSessionId());
      hash.update(buffer.buffer, 0, buffer.index);
      byte[] c2sCipherIV = hash.digest();

      buffer.buffer[letterIndex]++;  // Increment to 'B'
      hash.update(buffer.buffer, 0, buffer.index);
      byte[] s2cCipherIV = hash.digest();

      buffer.buffer[letterIndex]++;  // Increment to 'C'
      hash.update(buffer.buffer, 0, buffer.index);
      byte[] c2sCipherKey = hash.digest();

      buffer.buffer[letterIndex]++;  // Increment to 'D'
      hash.update(buffer.buffer, 0, buffer.index);
      byte[] s2cCipherKey = hash.digest();

      buffer.buffer[letterIndex]++;  // Increment to 'E'
      hash.update(buffer.buffer, 0, buffer.index);
      byte[] c2sMacIV = hash.digest();

      buffer.buffer[letterIndex]++;  // Increment to 'F'
      hash.update(buffer.buffer, 0, buffer.index);
      byte[] s2cMacIV = hash.digest();

      // Generate server-to-client cipher instance
      _readCipher = CipherManager.getManager().createCipher(proposal.getCipherAlgStoC(), _session);
      while( _readCipher.getBlockSize() > s2cCipherKey.length ) {
        buffer.reset();
        buffer.skip(letterIndex);
        buffer.putBytes(s2cCipherKey);
        hash.update(buffer.buffer, 0, buffer.index);
        s2cCipherKey = Util.join(s2cCipherKey, hash.digest());
      }
      _readCipher.init(Cipher.DECRYPT_MODE, s2cCipherKey, s2cCipherIV);
      _readCipherSize = _readCipher.getIVSize();

      // Generate server-to-client MAC instance
      _readMac = HashManager.getManager().createMAC(proposal.getMACAlgStoC());
      _readMac.init(s2cMacIV);
      _clientMacDigest = new byte[_readMac.getBlockSize()];
      _serverMacDigest = new byte[_readMac.getBlockSize()];

      // Generate client-to-server cipher instance
      _writeCipher = CipherManager.getManager().createCipher(proposal.getCipherAlgCtoS(), _session);
      while( _writeCipher.getBlockSize() > c2sCipherKey.length ) {
        buffer.reset();
        buffer.skip(letterIndex);
        buffer.putBytes(c2sCipherKey);
        hash.update(buffer.buffer, 0, buffer.index);
        c2sCipherKey = Util.join(c2sCipherKey, hash.digest());
      }
      _writeCipher.init(Cipher.ENCRYPT_MODE, c2sCipherKey, c2sCipherIV);
      _writeCipherSize = _writeCipher.getIVSize();

      // Generate client-to-server MAC instance
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