staging/rtl8192u: switch to RC4 library interface

Switch to the ARC4 library interface, to remove the pointless
dependency on the skcipher API, from which we will hopefully be
able to drop ecb(arc4) skcipher support.

Signed-off-by: Ard Biesheuvel <[e-mail]>
Acked-by: Greg Kroah-Hartman <[e-mail]>
Signed-off-by: Herbert Xu <[e-mail]>

drivers/staging/rtl8192u/Kconfig

···
 	select CRYPTO
 	select CRYPTO_AES
 	select CRYPTO_CCM
+	select CRYPTO_LIB_ARC4

drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_tkip.c

···
  * Copyright (c) 2003-2004, Jouni Malinen <[e-mail]>
  */
 
+#include <linux/fips.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
···
 
 #include "ieee80211.h"
 
+#include <crypto/arc4.h>
 #include <crypto/hash.h>
-#include <crypto/skcipher.h>
-	#include <linux/scatterlist.h>
 #include <linux/crc32.h>
 
 MODULE_AUTHOR("Jouni Malinen");
···
 
 	int key_idx;
 
-	struct crypto_sync_skcipher *rx_tfm_arc4;
+	struct arc4_ctx rx_ctx_arc4;
+	struct arc4_ctx tx_ctx_arc4;
 	struct crypto_shash *rx_tfm_michael;
-	struct crypto_sync_skcipher *tx_tfm_arc4;
 	struct crypto_shash *tx_tfm_michael;
 
 	/* scratch buffers for virt_to_page() (crypto API) */
···
 {
 	struct ieee80211_tkip_data *priv;
 
+	if (fips_enabled)
+		return NULL;
+
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		goto fail;
 	priv->key_idx = key_idx;
-
-	priv->tx_tfm_arc4 = crypto_alloc_sync_skcipher("ecb(arc4)", 0, 0);
-	if (IS_ERR(priv->tx_tfm_arc4)) {
-		printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
-				"crypto API arc4\n");
-		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)) {
 		printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
 				"crypto API michael_mic\n");
 		priv->tx_tfm_michael = NULL;
-		goto fail;
-	}
-
-	priv->rx_tfm_arc4 = crypto_alloc_sync_skcipher("ecb(arc4)", 0, 0);
-	if (IS_ERR(priv->rx_tfm_arc4)) {
-		printk(KERN_DEBUG "ieee80211_crypt_tkip: could not allocate "
-				"crypto API arc4\n");
-		priv->rx_tfm_arc4 = NULL;
 		goto fail;
 	}
 
···
 fail:
 	if (priv) {
 		crypto_free_shash(priv->tx_tfm_michael);
-		crypto_free_sync_skcipher(priv->tx_tfm_arc4);
 		crypto_free_shash(priv->rx_tfm_michael);
-		crypto_free_sync_skcipher(priv->rx_tfm_arc4);
 		kfree(priv);
 	}
 
···
 
 	if (_priv) {
 		crypto_free_shash(_priv->tx_tfm_michael);
-		crypto_free_sync_skcipher(_priv->tx_tfm_arc4);
 		crypto_free_shash(_priv->rx_tfm_michael);
-		crypto_free_sync_skcipher(_priv->rx_tfm_arc4);
 	}
-	kfree(priv);
+	kzfree(priv);
 }
 
 
···
 	u8 *pos;
 	struct rtl_80211_hdr_4addr *hdr;
 	struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
-	int ret = 0;
 	u8 rc4key[16],  *icv;
 	u32 crc;
-	struct scatterlist sg;
 
 	if (skb_headroom(skb) < 8 || skb_tailroom(skb) < 4 ||
 	    skb->len < hdr_len)
···
 	*pos++ = (tkey->tx_iv32 >> 24) & 0xff;
 
 	if (!tcb_desc->bHwSec) {
-		SYNC_SKCIPHER_REQUEST_ON_STACK(req, tkey->tx_tfm_arc4);
-
 		icv = skb_put(skb, 4);
 		crc = ~crc32_le(~0, pos, len);
 		icv[0] = crc;
 		icv[1] = crc >> 8;
 		icv[2] = crc >> 16;
 		icv[3] = crc >> 24;
-		crypto_sync_skcipher_setkey(tkey->tx_tfm_arc4, rc4key, 16);
-		sg_init_one(&sg, pos, len + 4);
-		skcipher_request_set_sync_tfm(req, tkey->tx_tfm_arc4);
-		skcipher_request_set_callback(req, 0, NULL, NULL);
-		skcipher_request_set_crypt(req, &sg, &sg, len + 4, NULL);
-		ret = crypto_skcipher_encrypt(req);
-		skcipher_request_zero(req);
+
+		arc4_setkey(&tkey->tx_ctx_arc4, rc4key, 16);
+		arc4_crypt(&tkey->tx_ctx_arc4, pos, pos, len + 4);
 	}
 
 	tkey->tx_iv16++;
···
 		tkey->tx_iv32++;
 	}
 
-	if (!tcb_desc->bHwSec)
-		return ret;
-	else
-		return 0;
-
-
+	return 0;
 }
 
 static int ieee80211_tkip_decrypt(struct sk_buff *skb, int hdr_len, void *priv)
···
 	u8 rc4key[16];
 	u8 icv[4];
 	u32 crc;
-	struct scatterlist sg;
 	int plen;
-	int err;
 
 	if (skb->len < hdr_len + 8 + 4)
 		return -1;
···
 	pos += 8;
 
 	if (!tcb_desc->bHwSec) {
-		SYNC_SKCIPHER_REQUEST_ON_STACK(req, tkey->rx_tfm_arc4);
-
 		if (iv32 < tkey->rx_iv32 ||
 		(iv32 == tkey->rx_iv32 && iv16 <= tkey->rx_iv16)) {
 			if (net_ratelimit()) {
···
 
 		plen = skb->len - hdr_len - 12;
 
-		crypto_sync_skcipher_setkey(tkey->rx_tfm_arc4, rc4key, 16);
-		sg_init_one(&sg, pos, plen + 4);
-
-		skcipher_request_set_sync_tfm(req, tkey->rx_tfm_arc4);
-		skcipher_request_set_callback(req, 0, NULL, NULL);
-		skcipher_request_set_crypt(req, &sg, &sg, plen + 4, NULL);
-
-		err = crypto_skcipher_decrypt(req);
-		skcipher_request_zero(req);
-		if (err) {
-			if (net_ratelimit()) {
-				netdev_dbg(skb->dev, "TKIP: failed to decrypt "
-						"received packet from %pM\n",
-						hdr->addr2);
-			}
-			return -7;
-		}
+		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;
···
 	struct ieee80211_tkip_data *tkey = priv;
 	int keyidx;
 	struct crypto_shash *tfm = tkey->tx_tfm_michael;
-	struct crypto_sync_skcipher *tfm2 = tkey->tx_tfm_arc4;
 	struct crypto_shash *tfm3 = tkey->rx_tfm_michael;
-	struct crypto_sync_skcipher *tfm4 = tkey->rx_tfm_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->rx_tfm_michael = tfm3;
-	tkey->rx_tfm_arc4 = tfm4;
 
 	if (len == TKIP_KEY_LEN) {
 		memcpy(tkey->key, key, TKIP_KEY_LEN);

drivers/staging/rtl8192u/ieee80211/ieee80211_crypt_wep.c

···
  * Copyright (c) 2002-2004, Jouni Malinen <[e-mail]>
  */
 
+#include <linux/fips.h>
 #include <linux/module.h>
 #include <linux/init.h>
 #include <linux/slab.h>
···
 
 #include "ieee80211.h"
 
-#include <crypto/skcipher.h>
-#include <linux/scatterlist.h>
+#include <crypto/arc4.h>
 #include <linux/crc32.h>
 
 MODULE_AUTHOR("Jouni Malinen");
···
 	u8 key[WEP_KEY_LEN + 1];
 	u8 key_len;
 	u8 key_idx;
-	struct crypto_sync_skcipher *tx_tfm;
-	struct crypto_sync_skcipher *rx_tfm;
+	struct arc4_ctx rx_ctx_arc4;
+	struct arc4_ctx tx_ctx_arc4;
 };
 
 
···
 {
 	struct prism2_wep_data *priv;
 
+	if (fips_enabled)
+		return NULL;
+
 	priv = kzalloc(sizeof(*priv), GFP_KERNEL);
 	if (!priv)
 		return NULL;
 	priv->key_idx = keyidx;
 
-	priv->tx_tfm = crypto_alloc_sync_skcipher("ecb(arc4)", 0, 0);
-	if (IS_ERR(priv->tx_tfm))
-		goto free_priv;
-	priv->rx_tfm = crypto_alloc_sync_skcipher("ecb(arc4)", 0, 0);
-	if (IS_ERR(priv->rx_tfm))
-		goto free_tx;
-
 	/* start WEP IV from a random value */
 	get_random_bytes(&priv->iv, 4);
 
 	return priv;
-free_tx:
-	crypto_free_sync_skcipher(priv->tx_tfm);
-free_priv:
-	kfree(priv);
-	return NULL;
 }
 
 
 static void prism2_wep_deinit(void *priv)
 {
-	struct prism2_wep_data *_priv = priv;
-
-	if (_priv) {
-		crypto_free_sync_skcipher(_priv->tx_tfm);
-		crypto_free_sync_skcipher(_priv->rx_tfm);
-	}
-	kfree(priv);
+	kzfree(priv);
 }
 
 /* Perform WEP encryption on given skb that has at least 4 bytes of headroom
···
 	struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
 	u32 crc;
 	u8 *icv;
-	struct scatterlist sg;
-	int err;
 
 	if (skb_headroom(skb) < 4 || skb_tailroom(skb) < 4 ||
 	    skb->len < hdr_len)
···
 	memcpy(key + 3, wep->key, wep->key_len);
 
 	if (!tcb_desc->bHwSec) {
-		SYNC_SKCIPHER_REQUEST_ON_STACK(req, wep->tx_tfm);
-
 		/* Append little-endian CRC32 and encrypt it to produce ICV */
 		crc = ~crc32_le(~0, pos, len);
 		icv = skb_put(skb, 4);
···
 		icv[2] = crc >> 16;
 		icv[3] = crc >> 24;
 
-		crypto_sync_skcipher_setkey(wep->tx_tfm, key, klen);
-		sg_init_one(&sg, pos, len + 4);
-
-		skcipher_request_set_sync_tfm(req, wep->tx_tfm);
-		skcipher_request_set_callback(req, 0, NULL, NULL);
-		skcipher_request_set_crypt(req, &sg, &sg, len + 4, NULL);
-
-		err = crypto_skcipher_encrypt(req);
-		skcipher_request_zero(req);
-		return err;
+		arc4_setkey(&wep->tx_ctx_arc4, key, klen);
+		arc4_crypt(&wep->tx_ctx_arc4, pos, pos, len + 4);
 	}
 
 	return 0;
···
 	struct cb_desc *tcb_desc = (struct cb_desc *)(skb->cb + MAX_DEV_ADDR_SIZE);
 	u32 crc;
 	u8 icv[4];
-	struct scatterlist sg;
-	int err;
 
 	if (skb->len < hdr_len + 8)
 		return -1;
···
 	plen = skb->len - hdr_len - 8;
 
 	if (!tcb_desc->bHwSec) {
-		SYNC_SKCIPHER_REQUEST_ON_STACK(req, wep->rx_tfm);
-
-		crypto_sync_skcipher_setkey(wep->rx_tfm, key, klen);
-		sg_init_one(&sg, pos, plen + 4);
-
-		skcipher_request_set_sync_tfm(req, wep->rx_tfm);
-		skcipher_request_set_callback(req, 0, NULL, NULL);
-		skcipher_request_set_crypt(req, &sg, &sg, plen + 4, NULL);
-
-		err = crypto_skcipher_decrypt(req);
-		skcipher_request_zero(req);
-		if (err)
-			return -7;
+		arc4_setkey(&wep->rx_ctx_arc4, key, klen);
+		arc4_crypt(&wep->rx_ctx_arc4, pos, pos, plen + 4);
 
 		crc = ~crc32_le(~0, pos, plen);
 		icv[0] = crc;