mac80211: aead api to reduce redundancy

Currently, the aes_ccm.c and aes_gcm.c are almost line by line copy of
each other. This patch reduce code redundancy by moving the code in these
two files to crypto/aead_api.c to make it a higher level aead api. The
file aes_ccm.c and aes_gcm.c are removed and all the functions there are
now implemented in their headers using the newly added aead api.

Signed-off-by: Xiang Gao <qasdfgtyuiop@gmail.com>
Signed-off-by: Johannes Berg <johannes.berg@intel.com>

1 files changed, 30 insertions, 8 deletions

diff --git a/net/mac80211/aes_gcm.h b/net/mac80211/aes_gcm.h
index 55aed53..d2b0960 100644
--- a/net/mac80211/aes_gcm.h
+++ b/net/mac80211/aes_gcm.h
@@ -9,16 +9,38 @@
 #ifndef AES_GCM_H
 #define AES_GCM_H
 
-#include <linux/crypto.h>
+#include "aead_api.h"
 
 #define GCM_AAD_LEN	32
 
-int ieee80211_aes_gcm_encrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad,
-			      u8 *data, size_t data_len, u8 *mic);
-int ieee80211_aes_gcm_decrypt(struct crypto_aead *tfm, u8 *j_0, u8 *aad,
-			      u8 *data, size_t data_len, u8 *mic);
-struct crypto_aead *ieee80211_aes_gcm_key_setup_encrypt(const u8 key[],
-							size_t key_len);
-void ieee80211_aes_gcm_key_free(struct crypto_aead *tfm);
+static inline int ieee80211_aes_gcm_encrypt(struct crypto_aead *tfm,
+					    u8 *j_0, u8 *aad,  u8 *data,
+					    size_t data_len, u8 *mic)
+{
+	return aead_encrypt(tfm, j_0, aad + 2,
+			    be16_to_cpup((__be16 *)aad),
+			    data, data_len, mic);
+}
+
+static inline int ieee80211_aes_gcm_decrypt(struct crypto_aead *tfm,
+					    u8 *j_0, u8 *aad, u8 *data,
+					    size_t data_len, u8 *mic)
+{
+	return aead_decrypt(tfm, j_0, aad + 2,
+			    be16_to_cpup((__be16 *)aad),
+			    data, data_len, mic);
+}
+
+static inline struct crypto_aead *
+ieee80211_aes_gcm_key_setup_encrypt(const u8 key[], size_t key_len)
+{
+	return aead_key_setup_encrypt("gcm(aes)", key,
+				      key_len, IEEE80211_GCMP_MIC_LEN);
+}
+
+static inline void ieee80211_aes_gcm_key_free(struct crypto_aead *tfm)
+{
+	return aead_key_free(tfm);
+}
 
 #endif /* AES_GCM_H */