mac80211: remove the dependency on crypto_blkcipher
The only thing that using crypto_blkcipher with ecb does over just using
arc4 directly is wrapping the encrypt/decrypt function into a for loop,
looping over each individual character.
To be able to do this, it pulls in around 40 kb worth of unnecessary
kernel modules (at least on a MIPS embedded device).
Using arc4 directly not only eliminates those dependencies, it also makes
the code smaller.
Signed-off-by: Felix Fietkau <nbd@openwrt.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
diff --git a/net/mac80211/Kconfig b/net/mac80211/Kconfig
index 513f85c..f5fdfcbf 100644
--- a/net/mac80211/Kconfig
+++ b/net/mac80211/Kconfig
@@ -2,7 +2,6 @@
tristate "Generic IEEE 802.11 Networking Stack (mac80211)"
depends on CFG80211
select CRYPTO
- select CRYPTO_ECB
select CRYPTO_ARC4
select CRYPTO_AES
select CRC32
diff --git a/net/mac80211/ieee80211_i.h b/net/mac80211/ieee80211_i.h
index a404017..6eb2c852 100644
--- a/net/mac80211/ieee80211_i.h
+++ b/net/mac80211/ieee80211_i.h
@@ -809,8 +809,8 @@
struct rate_control_ref *rate_ctrl;
- struct crypto_blkcipher *wep_tx_tfm;
- struct crypto_blkcipher *wep_rx_tfm;
+ struct crypto_cipher *wep_tx_tfm;
+ struct crypto_cipher *wep_rx_tfm;
u32 wep_iv;
/* see iface.c */
diff --git a/net/mac80211/tkip.c b/net/mac80211/tkip.c
index e840c9c..757e4eb 100644
--- a/net/mac80211/tkip.c
+++ b/net/mac80211/tkip.c
@@ -202,7 +202,7 @@
* @payload_len is the length of payload (_not_ including IV/ICV length).
* @ta is the transmitter addresses.
*/
-int ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,
+int ieee80211_tkip_encrypt_data(struct crypto_cipher *tfm,
struct ieee80211_key *key,
u8 *pos, size_t payload_len, u8 *ta)
{
@@ -223,7 +223,7 @@
* beginning of the buffer containing IEEE 802.11 header payload, i.e.,
* including IV, Ext. IV, real data, Michael MIC, ICV. @payload_len is the
* length of payload, including IV, Ext. IV, MIC, ICV. */
-int ieee80211_tkip_decrypt_data(struct crypto_blkcipher *tfm,
+int ieee80211_tkip_decrypt_data(struct crypto_cipher *tfm,
struct ieee80211_key *key,
u8 *payload, size_t payload_len, u8 *ta,
u8 *ra, int only_iv, int queue,
diff --git a/net/mac80211/tkip.h b/net/mac80211/tkip.h
index 7e83dee..1cab9c8 100644
--- a/net/mac80211/tkip.h
+++ b/net/mac80211/tkip.h
@@ -15,7 +15,7 @@
u8 *ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key *key, u16 iv16);
-int ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,
+int ieee80211_tkip_encrypt_data(struct crypto_cipher *tfm,
struct ieee80211_key *key,
u8 *pos, size_t payload_len, u8 *ta);
enum {
@@ -24,7 +24,7 @@
TKIP_DECRYPT_INVALID_KEYIDX = -2,
TKIP_DECRYPT_REPLAY = -3,
};
-int ieee80211_tkip_decrypt_data(struct crypto_blkcipher *tfm,
+int ieee80211_tkip_decrypt_data(struct crypto_cipher *tfm,
struct ieee80211_key *key,
u8 *payload, size_t payload_len, u8 *ta,
u8 *ra, int only_iv, int queue,
diff --git a/net/mac80211/wep.c b/net/mac80211/wep.c
index 2ff6d1e..a1c6bfd 100644
--- a/net/mac80211/wep.c
+++ b/net/mac80211/wep.c
@@ -30,17 +30,15 @@
/* start WEP IV from a random value */
get_random_bytes(&local->wep_iv, WEP_IV_LEN);
- local->wep_tx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0,
- CRYPTO_ALG_ASYNC);
+ local->wep_tx_tfm = crypto_alloc_cipher("arc4", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(local->wep_tx_tfm)) {
local->wep_rx_tfm = ERR_PTR(-EINVAL);
return PTR_ERR(local->wep_tx_tfm);
}
- local->wep_rx_tfm = crypto_alloc_blkcipher("ecb(arc4)", 0,
- CRYPTO_ALG_ASYNC);
+ local->wep_rx_tfm = crypto_alloc_cipher("arc4", 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(local->wep_rx_tfm)) {
- crypto_free_blkcipher(local->wep_tx_tfm);
+ crypto_free_cipher(local->wep_tx_tfm);
local->wep_tx_tfm = ERR_PTR(-EINVAL);
return PTR_ERR(local->wep_rx_tfm);
}
@@ -51,9 +49,9 @@
void ieee80211_wep_free(struct ieee80211_local *local)
{
if (!IS_ERR(local->wep_tx_tfm))
- crypto_free_blkcipher(local->wep_tx_tfm);
+ crypto_free_cipher(local->wep_tx_tfm);
if (!IS_ERR(local->wep_rx_tfm))
- crypto_free_blkcipher(local->wep_rx_tfm);
+ crypto_free_cipher(local->wep_rx_tfm);
}
static inline bool ieee80211_wep_weak_iv(u32 iv, int keylen)
@@ -127,12 +125,11 @@
/* Perform WEP encryption using given key. data buffer must have tailroom
* for 4-byte ICV. data_len must not include this ICV. Note: this function
* does _not_ add IV. data = RC4(data | CRC32(data)) */
-int ieee80211_wep_encrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
+int ieee80211_wep_encrypt_data(struct crypto_cipher *tfm, u8 *rc4key,
size_t klen, u8 *data, size_t data_len)
{
- struct blkcipher_desc desc = { .tfm = tfm };
- struct scatterlist sg;
__le32 icv;
+ int i;
if (IS_ERR(tfm))
return -1;
@@ -140,9 +137,9 @@
icv = cpu_to_le32(~crc32_le(~0, data, data_len));
put_unaligned(icv, (__le32 *)(data + data_len));
- crypto_blkcipher_setkey(tfm, rc4key, klen);
- sg_init_one(&sg, data, data_len + WEP_ICV_LEN);
- crypto_blkcipher_encrypt(&desc, &sg, &sg, sg.length);
+ crypto_cipher_setkey(tfm, rc4key, klen);
+ for (i = 0; i < data_len + WEP_ICV_LEN; i++)
+ crypto_cipher_encrypt_one(tfm, data + i, data + i);
return 0;
}
@@ -186,19 +183,18 @@
/* Perform WEP decryption using given key. data buffer includes encrypted
* payload, including 4-byte ICV, but _not_ IV. data_len must not include ICV.
* Return 0 on success and -1 on ICV mismatch. */
-int ieee80211_wep_decrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
+int ieee80211_wep_decrypt_data(struct crypto_cipher *tfm, u8 *rc4key,
size_t klen, u8 *data, size_t data_len)
{
- struct blkcipher_desc desc = { .tfm = tfm };
- struct scatterlist sg;
__le32 crc;
+ int i;
if (IS_ERR(tfm))
return -1;
- crypto_blkcipher_setkey(tfm, rc4key, klen);
- sg_init_one(&sg, data, data_len + WEP_ICV_LEN);
- crypto_blkcipher_decrypt(&desc, &sg, &sg, sg.length);
+ crypto_cipher_setkey(tfm, rc4key, klen);
+ for (i = 0; i < data_len + WEP_ICV_LEN; i++)
+ crypto_cipher_decrypt_one(tfm, data + i, data + i);
crc = cpu_to_le32(~crc32_le(~0, data, data_len));
if (memcmp(&crc, data + data_len, WEP_ICV_LEN) != 0)
diff --git a/net/mac80211/wep.h b/net/mac80211/wep.h
index 58654ee..01e5484 100644
--- a/net/mac80211/wep.h
+++ b/net/mac80211/wep.h
@@ -18,12 +18,12 @@
int ieee80211_wep_init(struct ieee80211_local *local);
void ieee80211_wep_free(struct ieee80211_local *local);
-int ieee80211_wep_encrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
+int ieee80211_wep_encrypt_data(struct crypto_cipher *tfm, u8 *rc4key,
size_t klen, u8 *data, size_t data_len);
int ieee80211_wep_encrypt(struct ieee80211_local *local,
struct sk_buff *skb,
const u8 *key, int keylen, int keyidx);
-int ieee80211_wep_decrypt_data(struct crypto_blkcipher *tfm, u8 *rc4key,
+int ieee80211_wep_decrypt_data(struct crypto_cipher *tfm, u8 *rc4key,
size_t klen, u8 *data, size_t data_len);
bool ieee80211_wep_is_weak_iv(struct sk_buff *skb, struct ieee80211_key *key);