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mac80211: tkip.c use struct tkip_ctx in phase 1 key mixing 

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Cc: "John W. Linville" <linville@tuxdriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Harvey Harrison 2008-05-14 16:26:19 -07:00 committed by John W. Linville
parent b0f76b335f
commit 82a57447fa
1 changed files with 10 additions and 17 deletions
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27
net/mac80211/tkip.c
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@ -71,10 +71,12 @@ static u16 tkipS(u16 val)
* TSC = TKIP sequence counter (48 bits, only 32 msb bits used)
* P1K: 80 bits
*/
static void tkip_mixing_phase1(const u8 *ta, const u8 *tk, u32 tsc_IV32,
u16 *p1k)
static void tkip_mixing_phase1(struct ieee80211_key *key, const u8 *ta,
struct tkip_ctx *ctx, u32 tsc_IV32)
{
int i, j;
const u8 *tk = &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY];
u16 *p1k = ctx->p1k;
p1k[0] = tsc_IV32 & 0xFFFF;
p1k[1] = tsc_IV32 >> 16;
@ -90,6 +92,7 @@ static void tkip_mixing_phase1(const u8 *ta, const u8 *tk, u32 tsc_IV32,
p1k[3] += tkipS(p1k[2] ^ get_unaligned_le16(tk + 12 + j));
p1k[4] += tkipS(p1k[3] ^ get_unaligned_le16(tk + 0 + j)) + i;
}
ctx->initialized = 1;
}
static void tkip_mixing_phase2(const u16 *p1k, const u8 *tk, u16 tsc_IV16,
@ -146,12 +149,8 @@ static void ieee80211_tkip_gen_rc4key(struct ieee80211_key *key, u8 *ta,
u8 *rc4key)
{
/* Calculate per-packet key */
if (key->u.tkip.tx.iv16 == 0 || !key->u.tkip.tx.initialized) {
/* IV16 wrapped around - perform TKIP phase 1 */
tkip_mixing_phase1(ta, &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],
key->u.tkip.tx.iv32, key->u.tkip.tx.p1k);
key->u.tkip.tx.initialized = 1;
}
if (key->u.tkip.tx.iv16 == 0 || !key->u.tkip.tx.initialized)
tkip_mixing_phase1(key, ta, &key->u.tkip.tx, key->u.tkip.tx.iv32);
tkip_mixing_phase2(key->u.tkip.tx.p1k,
&key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],
@ -190,12 +189,8 @@ void ieee80211_get_tkip_key(struct ieee80211_key_conf *keyconf,
/* Update the p1k only when the iv16 in the packet wraps around, this
* might occur after the wrap around of iv16 in the key in case of
* fragmented packets. */
if (iv16 == 0 || !key->u.tkip.tx.initialized) {
/* IV16 wrapped around - perform TKIP phase 1 */
tkip_mixing_phase1(ta, &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],
iv32, key->u.tkip.tx.p1k);
key->u.tkip.tx.initialized = 1;
}
if (iv16 == 0 || !key->u.tkip.tx.initialized)
tkip_mixing_phase1(key, ta, &key->u.tkip.tx, iv32);
if (type == IEEE80211_TKIP_P1_KEY) {
memcpy(outkey, key->u.tkip.tx.p1k, sizeof(u16) * 5);
@ -286,10 +281,8 @@ int ieee80211_tkip_decrypt_data(struct crypto_blkcipher *tfm,
if (!key->u.tkip.rx[queue].initialized ||
key->u.tkip.rx[queue].iv32 != iv32) {
key->u.tkip.rx[queue].initialized = 1;
/* IV16 wrapped around - perform TKIP phase 1 */
tkip_mixing_phase1(ta, &key->conf.key[ALG_TKIP_TEMP_ENCR_KEY],
iv32, key->u.tkip.rx[queue].p1k);
tkip_mixing_phase1(key, ta, &key->u.tkip.rx[queue], iv32);
#ifdef CONFIG_TKIP_DEBUG
{
int i;