include/crypto/aes.h

   1 /* SPDX-License-Identifier: GPL-2.0 */
   2 /*
   3  * Common values for AES algorithms
   4  */
   5
   6 #ifndef _CRYPTO_AES_H
   7 #define _CRYPTO_AES_H
   8
   9 #include <linux/types.h>
  10 #include <linux/crypto.h>
  11
  12 #define AES_MIN_KEY_SIZE        16
  13 #define AES_MAX_KEY_SIZE        32
  14 #define AES_KEYSIZE_128         16
  15 #define AES_KEYSIZE_192         24
  16 #define AES_KEYSIZE_256         32
  17 #define AES_BLOCK_SIZE          16
  18 #define AES_MAX_KEYLENGTH       (15 * 16)
  19 #define AES_MAX_KEYLENGTH_U32   (AES_MAX_KEYLENGTH / sizeof(u32))
  20
  21 /*
  22  * Please ensure that the first two fields are 16-byte aligned
  23  * relative to the start of the structure, i.e., don't move them!
  24  */
  25 struct crypto_aes_ctx {
  26         u32 key_enc[AES_MAX_KEYLENGTH_U32];
  27         u32 key_dec[AES_MAX_KEYLENGTH_U32];
  28         u32 key_length;
  29 };
  30
  31 extern const u32 crypto_ft_tab[4][256];
  32 extern const u32 crypto_fl_tab[4][256];
  33 extern const u32 crypto_it_tab[4][256];
  34 extern const u32 crypto_il_tab[4][256];
  35
  36 int crypto_aes_set_key(struct crypto_tfm *tfm, const u8 *in_key,
  37                 unsigned int key_len);
  38 int crypto_aes_expand_key(struct crypto_aes_ctx *ctx, const u8 *in_key,
  39                 unsigned int key_len);
  40 #endif