release/src/router/nettle/twofish.h

   1 /* twofish.h
   2  *
   3  * The twofish block 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 /*
  27  * Twofish is a 128-bit block cipher that accepts a variable-length
  28  * key up to 256 bits, designed by Bruce Schneier and others.  See
  29  * http://www.counterpane.com/twofish.html for details.
  30  */
  31
  32 #ifndef NETTLE_TWOFISH_H_INCLUDED
  33 #define NETTLE_TWOFISH_H_INCLUDED
  34
  35 #include "nettle-types.h"
  36
  37 #ifdef __cplusplus
  38 extern "C" {
  39 #endif
  40
  41 /* Name mangling */
  42 #define twofish_set_key nettle_twofish_set_key
  43 #define twofish_encrypt nettle_twofish_encrypt
  44 #define twofish_decrypt nettle_twofish_decrypt
  45
  46 #define TWOFISH_BLOCK_SIZE 16
  47
  48 /* Variable key size between 128 and 256 bits. But the only valid
  49  * values are 16 (128 bits), 24 (192 bits) and 32 (256 bits). */
  50 #define TWOFISH_MIN_KEY_SIZE 16
  51 #define TWOFISH_MAX_KEY_SIZE 32
  52
  53 #define TWOFISH_KEY_SIZE 32
  54
  55 struct twofish_ctx
  56 {
  57   uint32_t keys[40];
  58   uint32_t s_box[4][256];
  59 };
  60
  61 void
  62 twofish_set_key(struct twofish_ctx *ctx,
  63                 unsigned length, const uint8_t *key);
  64
  65 void
  66 twofish_encrypt(const struct twofish_ctx *ctx,
  67                 unsigned length, uint8_t *dst,
  68                 const uint8_t *src);
  69 void
  70 twofish_decrypt(const struct twofish_ctx *ctx,
  71                 unsigned length, uint8_t *dst,
  72                 const uint8_t *src);
  73
  74 #ifdef __cplusplus
  75 }
  76 #endif
  77
  78 #endif /* NETTLE_TWOFISH_H_INCLUDED */