lib/crypto/aes_gcm_128.h

   1 /*
   2    AES-GCM-128
   3
   4    Copyright (C) Stefan Metzmacher 2014
   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_GCM_128_H
  21 #define LIB_CRYPTO_AES_GCM_128_H
  22
  23 #define AES_GCM_128_IV_SIZE (12)
  24
  25 struct aes_gcm_128_context {
  26         AES_KEY aes_key;
  27         uint8_t H[AES_BLOCK_SIZE];
  28         uint8_t J0[AES_BLOCK_SIZE];
  29         uint8_t CB[AES_BLOCK_SIZE];
  30         uint8_t Y[AES_BLOCK_SIZE];
  31         uint8_t AC[AES_BLOCK_SIZE];
  32
  33         struct aes_gcm_128_tmp {
  34                 uint8_t block[AES_BLOCK_SIZE];
  35                 size_t ofs;
  36                 size_t total;
  37         } A, C, c, y;
  38 };
  39
  40 void aes_gcm_128_init(struct aes_gcm_128_context *ctx,
  41                       const uint8_t K[AES_BLOCK_SIZE],
  42                       const uint8_t IV[AES_GCM_128_IV_SIZE]);
  43 void aes_gcm_128_updateA(struct aes_gcm_128_context *ctx,
  44                          const uint8_t *a, size_t a_len);
  45 void aes_gcm_128_updateC(struct aes_gcm_128_context *ctx,
  46                          const uint8_t *c, size_t c_len);
  47 void aes_gcm_128_crypt(struct aes_gcm_128_context *ctx,
  48                        uint8_t *m, size_t m_len);
  49 void aes_gcm_128_digest(struct aes_gcm_128_context *ctx,
  50                         uint8_t T[AES_BLOCK_SIZE]);
  51
  52 #endif /* LIB_CRYPTO_AES_GCM_128_H */