*/
#include <linux/config.h>
-#include <linux/version.h>
#include <linux/module.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <net/ieee80211.h>
-
#include <linux/crypto.h>
#include <asm/scatterlist.h>
#include <linux/crc32.h>
MODULE_DESCRIPTION("Host AP crypt: WEP");
MODULE_LICENSE("GPL");
-
struct prism2_wep_data {
u32 iv;
#define WEP_KEY_LEN 13
struct crypto_tfm *tfm;
};
-
-static void * prism2_wep_init(int keyidx)
+static void *prism2_wep_init(int keyidx)
{
struct prism2_wep_data *priv;
return priv;
-fail:
+ fail:
if (priv) {
if (priv->tfm)
crypto_free_tfm(priv->tfm);
return NULL;
}
-
static void prism2_wep_deinit(void *priv)
{
struct prism2_wep_data *_priv = priv;
kfree(priv);
}
-
-/* Perform WEP encryption on given skb that has at least 4 bytes of headroom
- * for IV and 4 bytes of tailroom for ICV. Both IV and ICV will be transmitted,
- * so the payload length increases with 8 bytes.
- *
- * WEP frame payload: IV + TX key idx, RC4(data), ICV = RC4(CRC32(data))
- */
-static int prism2_wep_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
+/* Add WEP IV/key info to a frame that has at least 4 bytes of headroom */
+static int prism2_wep_build_iv(struct sk_buff *skb, int hdr_len, void *priv)
{
struct prism2_wep_data *wep = priv;
- u32 crc, klen, len;
- u8 key[WEP_KEY_LEN + 3];
- u8 *pos, *icv;
- struct scatterlist sg;
-
- if (skb_headroom(skb) < 4 || skb_tailroom(skb) < 4 ||
- skb->len < hdr_len)
+ u32 klen, len;
+ u8 *pos;
+
+ if (skb_headroom(skb) < 4 || skb->len < hdr_len)
return -1;
len = skb->len - hdr_len;
}
/* Prepend 24-bit IV to RC4 key and TX frame */
- *pos++ = key[0] = (wep->iv >> 16) & 0xff;
- *pos++ = key[1] = (wep->iv >> 8) & 0xff;
- *pos++ = key[2] = wep->iv & 0xff;
+ *pos++ = (wep->iv >> 16) & 0xff;
+ *pos++ = (wep->iv >> 8) & 0xff;
+ *pos++ = wep->iv & 0xff;
*pos++ = wep->key_idx << 6;
+ return 0;
+}
+
+/* Perform WEP encryption on given skb that has at least 4 bytes of headroom
+ * for IV and 4 bytes of tailroom for ICV. Both IV and ICV will be transmitted,
+ * so the payload length increases with 8 bytes.
+ *
+ * WEP frame payload: IV + TX key idx, RC4(data), ICV = RC4(CRC32(data))
+ */
+static int prism2_wep_encrypt(struct sk_buff *skb, int hdr_len, void *priv)
+{
+ struct prism2_wep_data *wep = priv;
+ u32 crc, klen, len;
+ u8 *pos, *icv;
+ struct scatterlist sg;
+ u8 key[WEP_KEY_LEN + 3];
+
+ /* other checks are in prism2_wep_build_iv */
+ if (skb_tailroom(skb) < 4)
+ return -1;
+
+ /* add the IV to the frame */
+ if (prism2_wep_build_iv(skb, hdr_len, priv))
+ return -1;
+
+ /* Copy the IV into the first 3 bytes of the key */
+ memcpy(key, skb->data + hdr_len, 3);
+
/* Copy rest of the WEP key (the secret part) */
memcpy(key + 3, wep->key, wep->key_len);
+
+ len = skb->len - hdr_len - 4;
+ pos = skb->data + hdr_len + 4;
+ klen = 3 + wep->key_len;
- /* Append little-endian CRC32 and encrypt it to produce ICV */
+ /* Append little-endian CRC32 over only the data and encrypt it to produce ICV */
crc = ~crc32_le(~0, pos, len);
icv = skb_put(skb, 4);
icv[0] = crc;
return 0;
}
-
/* Perform WEP decryption on given buffer. Buffer includes whole WEP part of
* the frame: IV (4 bytes), encrypted payload (including SNAP header),
* ICV (4 bytes). len includes both IV and ICV.
return 0;
}
-
-static int prism2_wep_set_key(void *key, int len, u8 *seq, void *priv)
+static int prism2_wep_set_key(void *key, int len, u8 * seq, void *priv)
{
struct prism2_wep_data *wep = priv;
return 0;
}
-
-static int prism2_wep_get_key(void *key, int len, u8 *seq, void *priv)
+static int prism2_wep_get_key(void *key, int len, u8 * seq, void *priv)
{
struct prism2_wep_data *wep = priv;
return wep->key_len;
}
-
-static char * prism2_wep_print_stats(char *p, void *priv)
+static char *prism2_wep_print_stats(char *p, void *priv)
{
struct prism2_wep_data *wep = priv;
- p += sprintf(p, "key[%d] alg=WEP len=%d\n",
- wep->key_idx, wep->key_len);
+ p += sprintf(p, "key[%d] alg=WEP len=%d\n", wep->key_idx, wep->key_len);
return p;
}
-
static struct ieee80211_crypto_ops ieee80211_crypt_wep = {
- .name = "WEP",
- .init = prism2_wep_init,
- .deinit = prism2_wep_deinit,
- .encrypt_mpdu = prism2_wep_encrypt,
- .decrypt_mpdu = prism2_wep_decrypt,
- .encrypt_msdu = NULL,
- .decrypt_msdu = NULL,
- .set_key = prism2_wep_set_key,
- .get_key = prism2_wep_get_key,
- .print_stats = prism2_wep_print_stats,
- .extra_prefix_len = 4, /* IV */
- .extra_postfix_len = 4, /* ICV */
- .owner = THIS_MODULE,
+ .name = "WEP",
+ .init = prism2_wep_init,
+ .deinit = prism2_wep_deinit,
+ .build_iv = prism2_wep_build_iv,
+ .encrypt_mpdu = prism2_wep_encrypt,
+ .decrypt_mpdu = prism2_wep_decrypt,
+ .encrypt_msdu = NULL,
+ .decrypt_msdu = NULL,
+ .set_key = prism2_wep_set_key,
+ .get_key = prism2_wep_get_key,
+ .print_stats = prism2_wep_print_stats,
+ .extra_mpdu_prefix_len = 4, /* IV */
+ .extra_mpdu_postfix_len = 4, /* ICV */
+ .owner = THIS_MODULE,
};
-
static int __init ieee80211_crypto_wep_init(void)
{
return ieee80211_register_crypto_ops(&ieee80211_crypt_wep);
}
-
static void __exit ieee80211_crypto_wep_exit(void)
{
ieee80211_unregister_crypto_ops(&ieee80211_crypt_wep);
}
-
module_init(ieee80211_crypto_wep_init);
module_exit(ieee80211_crypto_wep_exit);
projects / powerpc.git / blobdiff