_ Git - BoarSSL/blob - SSLTLS/RecordDecrypt.cs

   1 /*
   2  * Copyright (c) 2017 Thomas Pornin <pornin@bolet.org>
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining
   5  * a copy of this software and associated documentation files (the
   6  * "Software"), to deal in the Software without restriction, including
   7  * without limitation the rights to use, copy, modify, merge, publish,
   8  * distribute, sublicense, and/or sell copies of the Software, and to
   9  * permit persons to whom the Software is furnished to do so, subject to
  10  * the following conditions:
  11  *
  12  * The above copyright notice and this permission notice shall be
  13  * included in all copies or substantial portions of the Software.
  14  *
  15  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
  16  * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
  17  * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
  18  * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
  19  * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
  20  * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
  21  * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
  22  * SOFTWARE.
  23  */
  24
  25 using System;
  26 using System.Text;
  27
  28 using Crypto;
  29
  30 namespace SSLTLS {
  31
  32 internal abstract class RecordDecrypt {
  33
  34         /*
  35          * Check whether an incoming record length is valid.
  36          */
  37         internal abstract bool CheckLength(int len);
  38
  39         /*
  40          * Decrypt the incoming record. This method assumes that the
  41          * record length has already been tested with CheckLength().
  42          * The 'off' and 'len' values point to the record contents (not
  43          * including the header), and are adjusted to point at the
  44          * decrypted plaintext. On error, false is returned.
  45          */
  46         internal abstract bool Decrypt(int recordType, int version,
  47                 byte[] data, ref int off, ref int len);
  48 }
  49
  50 }