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authorHarvey Harrison <harvey.harrison@gmail.com>2008-06-12 01:22:00 +0400
committerJohn W. Linville <linville@tuxdriver.com>2008-06-14 20:18:13 +0400
commitc801242c38de247d82f12f6bf28bd19a280a12ae (patch)
tree7ad4a20083f24b433e36ab28bda09ea87f499bdc /net/mac80211/tkip.c
parent87228f57434108d8463ff10fd408d8d1273a23d2 (diff)
downloadlinux-c801242c38de247d82f12f6bf28bd19a280a12ae.tar.xz
mac80211: tkip.c consolidate tkip IV writing in helper
Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
Diffstat (limited to 'net/mac80211/tkip.c')
-rw-r--r--net/mac80211/tkip.c25
1 files changed, 14 insertions, 11 deletions
diff --git a/net/mac80211/tkip.c b/net/mac80211/tkip.c
index a00cf1ea7719..a2c8ca1100b2 100644
--- a/net/mac80211/tkip.c
+++ b/net/mac80211/tkip.c
@@ -64,6 +64,15 @@ static u16 tkipS(u16 val)
return tkip_sbox[val & 0xff] ^ swab16(tkip_sbox[val >> 8]);
}
+static u8 *write_tkip_iv(u8 *pos, u16 iv16)
+{
+ *pos++ = iv16 >> 8;
+ *pos++ = ((iv16 >> 8) | 0x20) & 0x7f;
+ *pos++ = iv16 & 0xFF;
+ return pos;
+}
+
+
/*
* P1K := Phase1(TA, TK, TSC)
* TA = transmitter address (48 bits)
@@ -123,12 +132,9 @@ static void tkip_mixing_phase2(struct ieee80211_key *key, struct tkip_ctx *ctx,
ppk[4] += ror16(ppk[3], 1);
ppk[5] += ror16(ppk[4], 1);
- rc4key[0] = tsc_IV16 >> 8;
- rc4key[1] = ((tsc_IV16 >> 8) | 0x20) & 0x7f;
- rc4key[2] = tsc_IV16 & 0xFF;
- rc4key[3] = ((ppk[5] ^ get_unaligned_le16(tk)) >> 1) & 0xFF;
+ rc4key = write_tkip_iv(rc4key, tsc_IV16);
+ *rc4key++ = ((ppk[5] ^ get_unaligned_le16(tk)) >> 1) & 0xFF;
- rc4key += 4;
for (i = 0; i < 6; i++)
put_unaligned_le16(ppk[i], rc4key + 2 * i);
}
@@ -136,12 +142,9 @@ static void tkip_mixing_phase2(struct ieee80211_key *key, struct tkip_ctx *ctx,
/* Add TKIP IV and Ext. IV at @pos. @iv0, @iv1, and @iv2 are the first octets
* of the IV. Returns pointer to the octet following IVs (i.e., beginning of
* the packet payload). */
-u8 *ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key *key,
- u8 iv0, u8 iv1, u8 iv2)
+u8 *ieee80211_tkip_add_iv(u8 *pos, struct ieee80211_key *key, u16 iv16)
{
- *pos++ = iv0;
- *pos++ = iv1;
- *pos++ = iv2;
+ pos = write_tkip_iv(pos, iv16);
*pos++ = (key->conf.keyidx << 6) | (1 << 5) /* Ext IV */;
put_unaligned_le32(key->u.tkip.tx.iv32, pos);
return pos + 4;
@@ -213,7 +216,7 @@ void ieee80211_tkip_encrypt_data(struct crypto_blkcipher *tfm,
u8 rc4key[16];
ieee80211_tkip_gen_rc4key(key, ta, rc4key);
- pos = ieee80211_tkip_add_iv(pos, key, rc4key[0], rc4key[1], rc4key[2]);
+ pos = ieee80211_tkip_add_iv(pos, key, key->u.tkip.tx.iv16);
ieee80211_wep_encrypt_data(tfm, rc4key, 16, pos, payload_len);
}