crypto/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., 59 Temple Place - Suite 330, Boston,
  23  * MA 02111-1307, USA.
  24  */
  25
  26 #ifndef NETTLE_AES_H_INCLUDED
  27 #define NETTLE_AES_H_INCLUDED
  28
  29 #include <inttypes.h>
  30
  31 /* Name mangling */
  32 #define aes_set_encrypt_key nettle_aes_set_encrypt_key
  33 #define aes_set_decrypt_key nettle_aes_set_decrypt_key
  34 #define aes_encrypt nettle_aes_encrypt
  35 #define aes_decrypt nettle_aes_decrypt
  36
  37 #define AES_BLOCK_SIZE 16
  38
  39 /* Variable key size between 128 and 256 bits. But the only valid
  40  * values are 16 (128 bits), 24 (192 bits) and 32 (256 bits). */
  41 #define AES_MIN_KEY_SIZE 16
  42 #define AES_MAX_KEY_SIZE 32
  43
  44 #define AES_KEY_SIZE 32
  45
  46 struct aes_ctx
  47 {
  48   uint32_t keys[60];  /* maximum size of key schedule */
  49   unsigned  nrounds;  /* number of rounds to use for our key size */
  50 };
  51
  52 void
  53 aes_set_encrypt_key(struct aes_ctx *ctx,
  54                     unsigned length, const uint8_t *key);
  55 void
  56 aes_set_decrypt_key(struct aes_ctx *ctx,
  57                    unsigned length, const uint8_t *key);
  58
  59 void
  60 aes_encrypt(struct aes_ctx *ctx,
  61             unsigned length, uint8_t *dst,
  62             const uint8_t *src);
  63 void
  64 aes_decrypt(struct aes_ctx *ctx,
  65             unsigned length, uint8_t *dst,
  66             const uint8_t *src);
  67
  68 #endif /* NETTLE_AES_H_INCLUDED */