wsutil/eax.h

   1 /* eax.h
   2  * Encryption and decryption routines implementing the EAX' encryption mode
   3  * Copyright 2010, Edward J. Beroset, edward.j.beroset@us.elster.com
   4  *
   5  * $Id$
   6  *
   7  * Wireshark - Network traffic analyzer
   8  * By Gerald Combs <gerald@wireshark.org>
   9  * Copyright 1998 Gerald Combs
  10  *
  11  * This program is free software; you can redistribute it and/or
  12  * modify it under the terms of the GNU General Public License
  13  * as published by the Free Software Foundation; either version 2
  14  * of the License, or (at your option) any later version.
  15  *
  16  * This program is distributed in the hope that it will be useful,
  17  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  18  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  19  * GNU General Public License for more details.
  20  *
  21  * You should have received a copy of the GNU General Public License
  22  * along with this program; if not, write to the Free Software
  23  * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
  24  */
  25
  26 #ifndef _EAX_H
  27 #define _EAX_H
  28
  29 #include <glib.h>
  30 #include "ws_symbol_export.h"
  31
  32 typedef struct tagMAC_T
  33 {
  34     guint8 Mac[4];
  35 } MAC_T;
  36
  37 #define EAX_MODE_CLEARTEXT_AUTH     1
  38 #define EAX_MODE_CIPHERTEXT_AUTH    2
  39
  40 #define EAX_SIZEOF_KEY              16
  41
  42 /*!
  43  Decrypts cleartext data using EAX' mode (see ANSI Standard C12.22-2008).
  44
  45  @param[in]     pN      pointer to cleartext (canonified form)
  46  @param[in]     pK      pointer to secret key
  47  @param[in,out] pC      pointer to ciphertext
  48  @param[in]     SizeN   byte length of cleartext (pN) buffer
  49  @param[in]     SizeK   byte length of secret key (pK)
  50  @param[in]     SizeC   byte length of ciphertext (pC) buffer
  51  @param[in]     pMac    four-byte Message Authentication Code
  52  @param[in]     Mode    EAX_MODE_CLEARTEXT_AUTH or EAX_MODE_CIPHERTEXT_AUTH
  53  @return                TRUE if message has been authenticated; FALSE if not
  54                         authenticated, invalid Mode or error
  55  */
  56 WS_DLL_PUBLIC
  57 gboolean Eax_Decrypt(guint8 *pN, guint8 *pK, guint8 *pC,
  58                  guint32 SizeN, guint32 SizeK, guint32 SizeC, MAC_T *pMac,
  59                  guint8 Mode);
  60
  61 #endif