release/src/router/nettle/arcfour.h

   1 /* arcfour.h
   2  *
   3  * The arcfour/rc4 stream cipher.
   4  */
   5
   6 /* nettle, low-level cryptographics library
   7  *
   8  * Copyright (C) 2001 Niels Möller
   9  *
  10  * The nettle library is free software; you can redistribute it and/or modify
  11  * it under the terms of the GNU Lesser General Public License as published by
  12  * the Free Software Foundation; either version 2.1 of the License, or (at your
  13  * option) any later version.
  14  *
  15  * The nettle library is distributed in the hope that it will be useful, but
  16  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  17  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  18  * License for more details.
  19  *
  20  * You should have received a copy of the GNU Lesser General Public License
  21  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  22  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  23  * MA 02111-1301, USA.
  24  */
  25
  26 #ifndef NETTLE_ARCFOUR_H_INCLUDED
  27 #define NETTLE_ARCFOUR_H_INCLUDED
  28
  29 #include "nettle-types.h"
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 /* Name mangling */
  36 #define arcfour_set_key nettle_arcfour_set_key
  37 #define arcfour_crypt nettle_arcfour_crypt
  38
  39 /* Minimum and maximum keysizes, and a reasonable default. In
  40  * octets.*/
  41 #define ARCFOUR_MIN_KEY_SIZE 1
  42 #define ARCFOUR_MAX_KEY_SIZE 256
  43 #define ARCFOUR_KEY_SIZE 16
  44
  45 struct arcfour_ctx
  46 {
  47   uint8_t S[256];
  48   uint8_t i;
  49   uint8_t j;
  50 };
  51
  52 void
  53 arcfour_set_key(struct arcfour_ctx *ctx,
  54                 unsigned length, const uint8_t *key);
  55
  56 void
  57 arcfour_crypt(struct arcfour_ctx *ctx,
  58               unsigned length, uint8_t *dst,
  59               const uint8_t *src);
  60
  61 #ifdef __cplusplus
  62 }
  63 #endif
  64
  65 #endif /* NETTLE_ARCFOUR_H_INCLUDED */
  66