From: Johannes Berg <johannes.berg@xxxxxxxxx>
When the driver wants to pre-program the TKIP
RX phase 1 key, it needs to be able to obtain
it for the peer's TA. Add API to allow it to
generate it.
The generation uses a dummy on-stack context
since it doesn't know the RX queue.
Signed-off-by: Johannes Berg <johannes.berg@xxxxxxxxx>
---
include/net/mac80211.h | 14 ++++++++++++++
net/mac80211/tkip.c | 11 +++++++++++
2 files changed, 25 insertions(+)
--- a/include/net/mac80211.h 2011-07-13 19:20:36.000000000 +0200
+++ b/include/net/mac80211.h 2011-07-13 19:24:20.000000000 +0200
@@ -2612,6 +2612,20 @@ static inline void ieee80211_get_tkip_p1
}
/**
+ * ieee80211_get_tkip_rx_p1k - get a TKIP phase 1 key for RX
+ *
+ * This function returns the TKIP phase 1 key for the given IV32
+ * and transmitter address.
+ *
+ * @keyconf: the parameter passed with the set key
+ * @ta: TA that will be used with the key
+ * @iv32: IV32 to get the P1K for
+ * @p1k: a buffer to which the key will be written, as 5 u16 values
+ */
+void ieee80211_get_tkip_rx_p1k(struct ieee80211_key_conf *keyconf,
+ const u8 *ta, u32 iv32, u16 *p1k);
+
+/**
* ieee80211_get_tkip_p2k - get a TKIP phase 2 key
*
* This function computes the TKIP RC4 key for the IV values
--- a/net/mac80211/tkip.c 2011-07-13 19:20:36.000000000 +0200
+++ b/net/mac80211/tkip.c 2011-07-13 19:20:37.000000000 +0200
@@ -185,6 +185,17 @@ void ieee80211_get_tkip_p1k_iv(struct ie
}
EXPORT_SYMBOL(ieee80211_get_tkip_p1k_iv);
+void ieee80211_get_tkip_rx_p1k(struct ieee80211_key_conf *keyconf,
+ const u8 *ta, u32 iv32, u16 *p1k)
+{
+ const u8 *tk = &keyconf->key[NL80211_TKIP_DATA_OFFSET_ENCR_KEY];
+ struct tkip_ctx ctx;
+
+ tkip_mixing_phase1(tk, &ctx, ta, iv32);
+ memcpy(p1k, ctx.p1k, sizeof(ctx.p1k));
+}
+EXPORT_SYMBOL(ieee80211_get_tkip_rx_p1k);
+
void ieee80211_get_tkip_p2k(struct ieee80211_key_conf *keyconf,
struct sk_buff *skb, u8 *p2k)
{
--
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