release/src/router/nettle/cast128.h

   1 /* cast128.h
   2  *
   3  * The CAST-128 block cipher.
   4  */
   5
   6 /*      CAST-128 in C
   7  *      Written by Steve Reid <sreid@sea-to-sky.net>
   8  *      100% Public Domain - no warranty
   9  *      Released 1997.10.11
  10  */
  11
  12 /* nettle, low-level cryptographics library
  13  *
  14  * Copyright (C) 2001 Niels Möller
  15  *
  16  * The nettle library is free software; you can redistribute it and/or modify
  17  * it under the terms of the GNU Lesser General Public License as published by
  18  * the Free Software Foundation; either version 2.1 of the License, or (at your
  19  * option) any later version.
  20  *
  21  * The nettle library is distributed in the hope that it will be useful, but
  22  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  23  * or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
  24  * License for more details.
  25  *
  26  * You should have received a copy of the GNU Lesser General Public License
  27  * along with the nettle library; see the file COPYING.LIB.  If not, write to
  28  * the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  29  * MA 02111-1301, USA.
  30  */
  31
  32 #ifndef NETTLE_CAST128_H_INCLUDED
  33 #define NETTLE_CAST128_H_INCLUDED
  34
  35 #include "nettle-types.h"
  36
  37 #ifdef __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 /* Name mangling */
  42 #define cast128_set_key nettle_cast128_set_key
  43 #define cast128_encrypt nettle_cast128_encrypt
  44 #define cast128_decrypt nettle_cast128_decrypt
  45
  46 #define CAST128_BLOCK_SIZE 8
  47
  48 /* Variable key size between 40 and 128. */
  49 #define CAST128_MIN_KEY_SIZE 5
  50 #define CAST128_MAX_KEY_SIZE 16
  51
  52 #define CAST128_KEY_SIZE 16
  53
  54 struct cast128_ctx
  55 {
  56   uint32_t keys[32];  /* Key, after expansion */
  57   unsigned rounds;    /* Number of rounds to use, 12 or 16 */
  58 };
  59
  60 void
  61 cast128_set_key(struct cast128_ctx *ctx,
  62                 unsigned length, const uint8_t *key);
  63
  64 void
  65 cast128_encrypt(const struct cast128_ctx *ctx,
  66                 unsigned length, uint8_t *dst,
  67                 const uint8_t *src);
  68 void
  69 cast128_decrypt(const struct cast128_ctx *ctx,
  70                 unsigned length, uint8_t *dst,
  71                 const uint8_t *src);
  72
  73 #ifdef __cplusplus
  74 }
  75 #endif
  76
  77 #endif /* NETTLE_CAST128_H_INCLUDED */