/*
 * 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);
}
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<div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/?id=6bb16e7ae26095892e8c51de4142d8f344793340&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
<tr><td><span title='2017-02-10 11:38:09 -0500'>2017-02-10</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/?id=6bb16e7ae26095892e8c51de4142d8f344793340'>sched: move err set right before goto errout in tc_ctl_tfilter</a></td><td>Jiri Pirko</td><td>1</td><td><span class='deletions'>-10</span>/<span class='insertions'>+19</span></td></tr>
<tr><td><span title='2017-02-10 11:38:08 -0500'>2017-02-10</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/?id=33a48927c193d030c80ecaeb3e021b7ed85f9c78'>sched: push TC filter protocol creation into a separate function</a></td><td>Jiri Pirko</td><td>1</td><td><span class='deletions'>-51</span>/<span class='insertions'>+59</span></td></tr>
<tr><td><span title='2017-02-10 11:38:08 -0500'>2017-02-10</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/?id=cf1facda2f61bc3e9ffd985b6d624dec6ad3f279'>sched: move tcf_proto_destroy and tcf_destroy_chain helpers into cls_api</a></td><td>Jiri Pirko</td><td>15</td><td><span class='deletions'>-26</span>/<span class='insertions'>+34</span></td></tr>
<tr><td><span title='2017-02-10 11:38:08 -0500'>2017-02-10</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/?id=79112c26f14c38ddbac3b2739469e373ef424fe6'>sched: rename tcf_destroy to tcf_destroy_proto</a></td><td>Jiri Pirko</td><td>3</td><td><span class='deletions'>-7</span>/<span class='insertions'>+7</span></td></tr>
<tr><td><span title='2017-02-10 11:32:14 -0500'>2017-02-10</span></td><td><a href='/cgit.cgi/linux/net-next.git/commit/?id=b4c4ebcf3ca22bf9b04fa9c6ccfbfdfe0a256d07'>Merge branch 'mlxsw-identical-routes-handling'</a></td><td>David S. Miller