lib/crypto/aes_ccm_128.h

   1 /*
   2    AES-CCM-128 (rfc 3610)
   3
   4    Copyright (C) Stefan Metzmacher 2012
   5
   6    This program is free software; you can redistribute it and/or modify
   7    it under the terms of the GNU General Public License as published by
   8    the Free Software Foundation; either version 3 of the License, or
   9    (at your option) any later version.
  10
  11    This program is distributed in the hope that it will be useful,
  12    but WITHOUT ANY WARRANTY; without even the implied warranty of
  13    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14    GNU General Public License for more details.
  15
  16    You should have received a copy of the GNU General Public License
  17    along with this program.  If not, see <http://www.gnu.org/licenses/>.
  18 */
  19
  20 #ifndef LIB_CRYPTO_AES_CCM_128_H
  21 #define LIB_CRYPTO_AES_CCM_128_H
  22
  23 #define AES_CCM_128_M 16
  24 #define AES_CCM_128_L 4
  25 #define AES_CCM_128_NONCE_SIZE (15 - AES_CCM_128_L)
  26
  27 struct aes_ccm_128_context {
  28         AES_KEY aes_key;
  29
  30         uint8_t nonce[AES_CCM_128_NONCE_SIZE];
  31
  32         size_t a_remain;
  33         size_t m_remain;
  34
  35         uint64_t __align;
  36
  37         uint8_t X_i[AES_BLOCK_SIZE];
  38         uint8_t B_i[AES_BLOCK_SIZE];
  39         uint8_t A_i[AES_BLOCK_SIZE];
  40         uint8_t S_i[AES_BLOCK_SIZE];
  41
  42         size_t B_i_ofs;
  43         size_t S_i_ofs;
  44         size_t S_i_ctr;
  45 };
  46
  47 void aes_ccm_128_init(struct aes_ccm_128_context *ctx,
  48                       const uint8_t K[AES_BLOCK_SIZE],
  49                       const uint8_t N[AES_CCM_128_NONCE_SIZE],
  50                       size_t a_total, size_t m_total);
  51 void aes_ccm_128_update(struct aes_ccm_128_context *ctx,
  52                         const uint8_t *v, size_t v_len);
  53 void aes_ccm_128_crypt(struct aes_ccm_128_context *ctx,
  54                          uint8_t *m, size_t m_len);
  55 void aes_ccm_128_digest(struct aes_ccm_128_context *ctx,
  56                         uint8_t digest[AES_BLOCK_SIZE]);
  57
  58 #endif /* LIB_CRYPTO_AES_CCM_128_H */