mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-21 11:44:01 +08:00
8e8862b79d
Do the check for sufficient skb->len explicitly and pass a pointer to the struct ieee80211_hdr directly to the michael_mic calculation. Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com> Signed-off-by: John W. Linville <linville@tuxdriver.com>
87 lines
2.2 KiB
C
87 lines
2.2 KiB
C
/*
|
|
* Michael MIC implementation - optimized for TKIP MIC operations
|
|
* Copyright 2002-2003, Instant802 Networks, Inc.
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License version 2 as
|
|
* published by the Free Software Foundation.
|
|
*/
|
|
#include <linux/types.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/ieee80211.h>
|
|
#include <asm/unaligned.h>
|
|
|
|
#include "michael.h"
|
|
|
|
static void michael_block(struct michael_mic_ctx *mctx, u32 val)
|
|
{
|
|
mctx->l ^= val;
|
|
mctx->r ^= rol32(mctx->l, 17);
|
|
mctx->l += mctx->r;
|
|
mctx->r ^= ((mctx->l & 0xff00ff00) >> 8) |
|
|
((mctx->l & 0x00ff00ff) << 8);
|
|
mctx->l += mctx->r;
|
|
mctx->r ^= rol32(mctx->l, 3);
|
|
mctx->l += mctx->r;
|
|
mctx->r ^= ror32(mctx->l, 2);
|
|
mctx->l += mctx->r;
|
|
}
|
|
|
|
static void michael_mic_hdr(struct michael_mic_ctx *mctx, const u8 *key,
|
|
struct ieee80211_hdr *hdr)
|
|
{
|
|
u8 *da, *sa, tid;
|
|
|
|
da = ieee80211_get_DA(hdr);
|
|
sa = ieee80211_get_SA(hdr);
|
|
if (ieee80211_is_data_qos(hdr->frame_control))
|
|
tid = *ieee80211_get_qos_ctl(hdr) & IEEE80211_QOS_CTL_TID_MASK;
|
|
else
|
|
tid = 0;
|
|
|
|
mctx->l = get_unaligned_le32(key);
|
|
mctx->r = get_unaligned_le32(key + 4);
|
|
|
|
/*
|
|
* A pseudo header (DA, SA, Priority, 0, 0, 0) is used in Michael MIC
|
|
* calculation, but it is _not_ transmitted
|
|
*/
|
|
michael_block(mctx, get_unaligned_le32(da));
|
|
michael_block(mctx, get_unaligned_le16(&da[4]) |
|
|
(get_unaligned_le16(sa) << 16));
|
|
michael_block(mctx, get_unaligned_le32(&sa[2]));
|
|
michael_block(mctx, tid);
|
|
}
|
|
|
|
void michael_mic(const u8 *key, struct ieee80211_hdr *hdr,
|
|
const u8 *data, size_t data_len, u8 *mic)
|
|
{
|
|
u32 val;
|
|
size_t block, blocks, left;
|
|
struct michael_mic_ctx mctx;
|
|
|
|
michael_mic_hdr(&mctx, key, hdr);
|
|
|
|
/* Real data */
|
|
blocks = data_len / 4;
|
|
left = data_len % 4;
|
|
|
|
for (block = 0; block < blocks; block++)
|
|
michael_block(&mctx, get_unaligned_le32(&data[block * 4]));
|
|
|
|
/* Partial block of 0..3 bytes and padding: 0x5a + 4..7 zeros to make
|
|
* total length a multiple of 4. */
|
|
val = 0x5a;
|
|
while (left > 0) {
|
|
val <<= 8;
|
|
left--;
|
|
val |= data[blocks * 4 + left];
|
|
}
|
|
|
|
michael_block(&mctx, val);
|
|
michael_block(&mctx, 0);
|
|
|
|
put_unaligned_le32(mctx.l, mic);
|
|
put_unaligned_le32(mctx.r, mic + 4);
|
|
}
|