diff mbox series

[v4,4/7] net/lib80211: move TKIP handling to ARC4 library code

Message ID 20190611230938.19265-5-ard.biesheuvel@linaro.org
State Superseded
Headers show
Series crypto: rc4 cleanup | expand

Commit Message

Ard Biesheuvel June 11, 2019, 11:09 p.m. UTC 
The crypto API abstraction is not very useful for invoking ciphers
directly, especially in the case of arc4, which only has a generic
implementation in C. So let's invoke the library code directly.

Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

---
 net/wireless/lib80211_crypt_tkip.c | 48 +++++++-------------
 1 file changed, 17 insertions(+), 31 deletions(-)

-- 
2.20.1

Comments

Eric Biggers June 12, 2019, 3:42 p.m. UTC | #1 
On Wed, Jun 12, 2019 at 01:09:35AM +0200, Ard Biesheuvel wrote:
> The crypto API abstraction is not very useful for invoking ciphers

> directly, especially in the case of arc4, which only has a generic

> implementation in C. So let's invoke the library code directly.

> 

> Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

> ---

>  net/wireless/lib80211_crypt_tkip.c | 48 +++++++-------------

>  1 file changed, 17 insertions(+), 31 deletions(-)

> 


Doesn't net/wireless/Kconfig also need to be updated to add 'select
CRYPTO_LIB_ARC4' to LIB80211_CRYPT_TKIP, like you did for LIB80211_CRYPT_WEP?

- Eric
Ard Biesheuvel June 12, 2019, 3:47 p.m. UTC | #2 
On Wed, 12 Jun 2019 at 17:42, Eric Biggers <ebiggers@kernel.org> wrote:
>

> On Wed, Jun 12, 2019 at 01:09:35AM +0200, Ard Biesheuvel wrote:

> > The crypto API abstraction is not very useful for invoking ciphers

> > directly, especially in the case of arc4, which only has a generic

> > implementation in C. So let's invoke the library code directly.

> >

> > Signed-off-by: Ard Biesheuvel <ard.biesheuvel@linaro.org>

> > ---

> >  net/wireless/lib80211_crypt_tkip.c | 48 +++++++-------------

> >  1 file changed, 17 insertions(+), 31 deletions(-)

> >

>

> Doesn't net/wireless/Kconfig also need to be updated to add 'select

> CRYPTO_LIB_ARC4' to LIB80211_CRYPT_TKIP, like you did for LIB80211_CRYPT_WEP?

>


Indeed.
diff mbox series

Patch

diff --git a/net/wireless/lib80211_crypt_tkip.c b/net/wireless/lib80211_crypt_tkip.c
index 11eaa5956f00..0fd155c4e0a6 100644
--- a/net/wireless/lib80211_crypt_tkip.c
+++ b/net/wireless/lib80211_crypt_tkip.c
@@ -13,6 +13,7 @@ 
 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
 
 #include <linux/err.h>
+#include <linux/fips.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
@@ -29,6 +30,7 @@ 
 #include <linux/ieee80211.h>
 #include <net/iw_handler.h>
 
+#include <crypto/arc4.h>
 #include <crypto/hash.h>
 #include <linux/crypto.h>
 #include <linux/crc32.h>
@@ -64,9 +66,9 @@  struct lib80211_tkip_data {
 
 	int key_idx;
 
-	struct crypto_cipher *rx_tfm_arc4;
+	struct arc4_ctx rx_ctx_arc4;
+	struct arc4_ctx tx_ctx_arc4;
 	struct crypto_shash *rx_tfm_michael;
-	struct crypto_cipher *tx_tfm_arc4;
 	struct crypto_shash *tx_tfm_michael;
 
 	/* scratch buffers for virt_to_page() (crypto API) */
@@ -93,30 +95,21 @@  static void *lib80211_tkip_init(int key_idx)
 {
 	struct lib80211_tkip_data *priv;
 
+	if (fips_enabled)
+		return NULL;
+
 	priv = kzalloc(sizeof(*priv), GFP_ATOMIC);
 	if (priv == NULL)
 		goto fail;
 
 	priv->key_idx = key_idx;
 
-	priv->tx_tfm_arc4 = crypto_alloc_cipher("arc4", 0, 0);
-	if (IS_ERR(priv->tx_tfm_arc4)) {
-		priv->tx_tfm_arc4 = NULL;
-		goto fail;
-	}
-
 	priv->tx_tfm_michael = crypto_alloc_shash("michael_mic", 0, 0);
 	if (IS_ERR(priv->tx_tfm_michael)) {
 		priv->tx_tfm_michael = NULL;
 		goto fail;
 	}
 
-	priv->rx_tfm_arc4 = crypto_alloc_cipher("arc4", 0, 0);
-	if (IS_ERR(priv->rx_tfm_arc4)) {
-		priv->rx_tfm_arc4 = NULL;
-		goto fail;
-	}
-
 	priv->rx_tfm_michael = crypto_alloc_shash("michael_mic", 0, 0);
 	if (IS_ERR(priv->rx_tfm_michael)) {
 		priv->rx_tfm_michael = NULL;
@@ -128,9 +121,7 @@  static void *lib80211_tkip_init(int key_idx)
       fail:
 	if (priv) {
 		crypto_free_shash(priv->tx_tfm_michael);
-		crypto_free_cipher(priv->tx_tfm_arc4);
 		crypto_free_shash(priv->rx_tfm_michael);
-		crypto_free_cipher(priv->rx_tfm_arc4);
 		kfree(priv);
 	}
 
@@ -142,11 +133,9 @@  static void lib80211_tkip_deinit(void *priv)
 	struct lib80211_tkip_data *_priv = priv;
 	if (_priv) {
 		crypto_free_shash(_priv->tx_tfm_michael);
-		crypto_free_cipher(_priv->tx_tfm_arc4);
 		crypto_free_shash(_priv->rx_tfm_michael);
-		crypto_free_cipher(_priv->rx_tfm_arc4);
 	}
-	kfree(priv);
+	kzfree(priv);
 }
 
 static inline u16 RotR1(u16 val)
@@ -345,7 +334,6 @@  static int lib80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
 	int len;
 	u8 rc4key[16], *pos, *icv;
 	u32 crc;
-	int i;
 
 	if (tkey->flags & IEEE80211_CRYPTO_TKIP_COUNTERMEASURES) {
 		struct ieee80211_hdr *hdr = (struct ieee80211_hdr *)skb->data;
@@ -370,9 +358,9 @@  static int lib80211_tkip_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
 	icv[2] = crc >> 16;
 	icv[3] = crc >> 24;
 
-	crypto_cipher_setkey(tkey->tx_tfm_arc4, rc4key, 16);
-	for (i = 0; i < len + 4; i++)
-		crypto_cipher_encrypt_one(tkey->tx_tfm_arc4, pos + i, pos + i);
+	arc4_setkey(&tkey->tx_ctx_arc4, rc4key, 16);
+	arc4_crypt(&tkey->tx_ctx_arc4, pos, pos, len + 4);
+
 	return 0;
 }
 
@@ -400,7 +388,6 @@  static int lib80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
 	u8 icv[4];
 	u32 crc;
 	int plen;
-	int i;
 
 	hdr = (struct ieee80211_hdr *)skb->data;
 
@@ -453,9 +440,8 @@  static int lib80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
 
 	plen = skb->len - hdr_len - 12;
 
-	crypto_cipher_setkey(tkey->rx_tfm_arc4, rc4key, 16);
-	for (i = 0; i < plen + 4; i++)
-		crypto_cipher_decrypt_one(tkey->rx_tfm_arc4, pos + i, pos + i);
+	arc4_setkey(&tkey->rx_ctx_arc4, rc4key, 16);
+	arc4_crypt(&tkey->rx_ctx_arc4, pos, pos, plen + 4);
 
 	crc = ~crc32_le(~0, pos, plen);
 	icv[0] = crc;
@@ -640,17 +626,17 @@  static int lib80211_tkip_set_key(void *key, int len, u8 * seq, void *priv)
 	struct lib80211_tkip_data *tkey = priv;
 	int keyidx;
 	struct crypto_shash *tfm = tkey->tx_tfm_michael;
-	struct crypto_cipher *tfm2 = tkey->tx_tfm_arc4;
+	struct arc4_ctx *tfm2 = &tkey->tx_ctx_arc4;
 	struct crypto_shash *tfm3 = tkey->rx_tfm_michael;
-	struct crypto_cipher *tfm4 = tkey->rx_tfm_arc4;
+	struct arc4_ctx *tfm4 = &tkey->rx_ctx_arc4;
 
 	keyidx = tkey->key_idx;
 	memset(tkey, 0, sizeof(*tkey));
 	tkey->key_idx = keyidx;
 	tkey->tx_tfm_michael = tfm;
-	tkey->tx_tfm_arc4 = tfm2;
+	tkey->tx_ctx_arc4 = *tfm2;
 	tkey->rx_tfm_michael = tfm3;
-	tkey->rx_tfm_arc4 = tfm4;
+	tkey->rx_ctx_arc4 = *tfm4;
 	if (len == TKIP_KEY_LEN) {
 		memcpy(tkey->key, key, TKIP_KEY_LEN);
 		tkey->key_set = 1;