release/src/router/nettle/aes.h

   1 /* aes.h
   2  *
   3  * The aes/rijndael 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 #ifndef NETTLE_AES_H_INCLUDED
  27 #define NETTLE_AES_H_INCLUDED
  28
  29 #include "nettle-types.h"
  30
  31 #ifdef __cplusplus
  32 extern "C" {
  33 #endif
  34
  35 /* Name mangling */
  36 #define aes_set_encrypt_key nettle_aes_set_encrypt_key
  37 #define aes_set_decrypt_key nettle_aes_set_decrypt_key
  38 #define aes_invert_key nettle_aes_invert_key
  39 #define aes_encrypt nettle_aes_encrypt
  40 #define aes_decrypt nettle_aes_decrypt
  41
  42 #define AES_BLOCK_SIZE 16
  43
  44 /* Variable key size between 128 and 256 bits. But the only valid
  45  * values are 16 (128 bits), 24 (192 bits) and 32 (256 bits). */
  46 #define AES_MIN_KEY_SIZE 16
  47 #define AES_MAX_KEY_SIZE 32
  48
  49 #define AES_KEY_SIZE 32
  50
  51 /* FIXME: Change to put nrounds first, to make it possible to use a
  52    truncated ctx struct, with less subkeys, for the shorter key
  53    sizes? */
  54 struct aes_ctx
  55 {
  56   uint32_t keys[60];  /* maximum size of key schedule */
  57   unsigned  nrounds;  /* number of rounds to use for our key size */
  58 };
  59
  60 void
  61 aes_set_encrypt_key(struct aes_ctx *ctx,
  62                     unsigned length, const uint8_t *key);
  63
  64 void
  65 aes_set_decrypt_key(struct aes_ctx *ctx,
  66                    unsigned length, const uint8_t *key);
  67
  68 void
  69 aes_invert_key(struct aes_ctx *dst,
  70                const struct aes_ctx *src);
  71
  72 void
  73 aes_encrypt(const struct aes_ctx *ctx,
  74             unsigned length, uint8_t *dst,
  75             const uint8_t *src);
  76 void
  77 aes_decrypt(const struct aes_ctx *ctx,
  78             unsigned length, uint8_t *dst,
  79             const uint8_t *src);
  80
  81 #ifdef __cplusplus
  82 }
  83 #endif
  84
  85 #endif /* NETTLE_AES_H_INCLUDED */