d2912cb15b
Based on 2 normalized pattern(s): 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 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 # extracted by the scancode license scanner the SPDX license identifier GPL-2.0-only has been chosen to replace the boilerplate/reference in 4122 file(s). Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Reviewed-by: Enrico Weigelt <info@metux.net> Reviewed-by: Kate Stewart <kstewart@linuxfoundation.org> Reviewed-by: Allison Randal <allison@lohutok.net> Cc: linux-spdx@vger.kernel.org Link: https://lkml.kernel.org/r/20190604081206.933168790@linutronix.de Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
84 lines
2.0 KiB
C
84 lines
2.0 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
|
|
/*
|
|
* Michael MIC implementation - optimized for TKIP MIC operations
|
|
* Copyright 2002-2003, Instant802 Networks, Inc.
|
|
*/
|
|
#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_tid(hdr);
|
|
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);
|
|
}
|