net/mac80211/aes_gcm.h

   1 /*
   2  * Copyright 2014-2015, Qualcomm Atheros, Inc.
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License version 2 as
   6  * published by the Free Software Foundation.
   7  */
   8
   9 #ifndef AES_GCM_H
  10 #define AES_GCM_H
  11
  12 #include "aead_api.h"
  13
  14 #define GCM_AAD_LEN     32
  15
  16 static inline int ieee80211_aes_gcm_encrypt(struct crypto_aead *tfm,
  17                                             u8 *j_0, u8 *aad,  u8 *data,
  18                                             size_t data_len, u8 *mic)
  19 {
  20         return aead_encrypt(tfm, j_0, aad + 2,
  21                             be16_to_cpup((__be16 *)aad),
  22                             data, data_len, mic);
  23 }
  24
  25 static inline int ieee80211_aes_gcm_decrypt(struct crypto_aead *tfm,
  26                                             u8 *j_0, u8 *aad, u8 *data,
  27                                             size_t data_len, u8 *mic)
  28 {
  29         return aead_decrypt(tfm, j_0, aad + 2,
  30                             be16_to_cpup((__be16 *)aad),
  31                             data, data_len, mic);
  32 }
  33
  34 static inline struct crypto_aead *
  35 ieee80211_aes_gcm_key_setup_encrypt(const u8 key[], size_t key_len)
  36 {
  37         return aead_key_setup_encrypt("gcm(aes)", key,
  38                                       key_len, IEEE80211_GCMP_MIC_LEN);
  39 }
  40
  41 static inline void ieee80211_aes_gcm_key_free(struct crypto_aead *tfm)
  42 {
  43         return aead_key_free(tfm);
  44 }
  45
  46 #endif /* AES_GCM_H */