text: /*
   * Copyright (c) 2004, Oracle and/or its affiliates. All rights reserved.
   * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   *
   * This code is free software; you can redistribute it and/or modify it
   * under the terms of the GNU General Public License version 2 only, as
   * published by the Free Software Foundation.  Oracle designates this
   * particular file as subject to the "Classpath" exception as provided
   * by Oracle in the LICENSE file that accompanied this code.
   *
   * This code 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 General Public License
   * version 2 for more details (a copy is included in the LICENSE file that
   * accompanied this code).
   *
   * You should have received a copy of the GNU General Public License version
   * 2 along with this work; if not, write to the Free Software Foundation,
   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
   *
   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
   * or visit www.oracle.com if you need additional information or have any
   * questions.
   */
  
  package sun.security.krb5.internal.crypto;
  
  import sun.security.krb5.KrbCryptoException;
  import sun.security.krb5.internal.*;
  import java.security.GeneralSecurityException;
  import sun.security.krb5.EncryptedData;
  import sun.security.krb5.Checksum;
  
  /*
   * This class encapsulates the encryption type for AES128
   *
   * @author Seema Malkani
   */
  
  public final class Aes128CtsHmacSha1EType extends EType {
  
      public int eType() {
          return EncryptedData.ETYPE_AES128_CTS_HMAC_SHA1_96;
      }
  
      public int minimumPadSize() {
          return 0;
      }
  
      public int confounderSize() {
          return blockSize();
      }
  
      public int checksumType() {
          return Checksum.CKSUMTYPE_HMAC_SHA1_96_AES128;
      }
  
      public int checksumSize() {
          return Aes128.getChecksumLength();
      }
  
      public int blockSize() {
          return 16;
      }
  
      public int keyType() {
          return Krb5.KEYTYPE_AES;
      }
  
      public int keySize() {
          return 16; // bytes
      }
  
      public byte[] encrypt(byte[] data, byte[] key, int usage)
          throws KrbCryptoException {
          byte[] ivec = new byte[blockSize()];
          return encrypt(data, key, ivec, usage);
      }
  
      public byte[] encrypt(byte[] data, byte[] key, byte[] ivec, int usage)
          throws KrbCryptoException {
          try {
              return Aes128.encrypt(key, usage, ivec, data, 0, data.length);
          } catch (GeneralSecurityException e) {
              KrbCryptoException ke = new KrbCryptoException(e.getMessage());
              ke.initCause(e);
              throw ke;
          }
      }
  
      public byte[] decrypt(byte[] cipher, byte[] key, int usage)
          throws KrbApErrException, KrbCryptoException {
          byte[] ivec = new byte[blockSize()];
          return decrypt(cipher, key, ivec, usage);
      }
  
      public byte[] decrypt(byte[] cipher, byte[] key, byte[] ivec, int usage)
          throws KrbApErrException, KrbCryptoException {
          try {
              return Aes128.decrypt(key, usage, ivec, cipher, 0, cipher.length);
          } catch (GeneralSecurityException e) {
              KrbCryptoException ke = new KrbCryptoException(e.getMessage());
              ke.initCause(e);
              throw ke;
          }
      }
  
      // Override default, because our decrypted data does not return confounder
      // Should eventually get rid of EType.decryptedData and
      // EncryptedData.decryptedData altogether
      public byte[] decryptedData(byte[] data) {
          return data;
      }
  }
  