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mac80211: michael.c use kernel-provided infrastructure

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Replace private implementation of bit rotation and unaligned access helpers
with kernel-provided implementation.

Fold xswap helper in its one usage in the michael_block macro.

Signed-off-by: Harvey Harrison <harvey.harrison@gmail.com>
Cc: "John W. Linville" <linville@tuxdriver.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Harvey Harrison 2008-05-14 16:26:16 -07:00 committed by John W. Linville
parent 57962f0b9d
commit 1bd3dff549
1 changed files with 14 additions and 46 deletions
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60
net/mac80211/michael.c
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@ -8,71 +8,39 @@
*/
#include <linux/types.h>
#include <linux/bitops.h>
#include <asm/unaligned.h>
#include "michael.h"
static inline u32 rotr(u32 val, int bits)
{
return (val >> bits) | (val << (32 - bits));
}
static inline u32 rotl(u32 val, int bits)
{
return (val << bits) | (val >> (32 - bits));
}
static inline u32 xswap(u32 val)
{
return ((val & 0xff00ff00) >> 8) | ((val & 0x00ff00ff) << 8);
}
#define michael_block(l, r) \
do { \
r ^= rotl(l, 17); \
r ^= rol32(l, 17); \
l += r; \
r ^= xswap(l); \
r ^= ((l & 0xff00ff00) >> 8) | ((l & 0x00ff00ff) << 8); \
l += r; \
r ^= rotl(l, 3); \
r ^= rol32(l, 3); \
l += r; \
r ^= rotr(l, 2); \
r ^= ror32(l, 2); \
l += r; \
} while (0)
static inline u32 michael_get32(u8 *data)
{
return data[0] | (data[1] << 8) | (data[2] << 16) | (data[3] << 24);
}
static inline void michael_put32(u32 val, u8 *data)
{
data[0] = val & 0xff;
data[1] = (val >> 8) & 0xff;
data[2] = (val >> 16) & 0xff;
data[3] = (val >> 24) & 0xff;
}
void michael_mic(u8 *key, u8 *da, u8 *sa, u8 priority,
u8 *data, size_t data_len, u8 *mic)
{
u32 l, r, val;
size_t block, blocks, left;
l = michael_get32(key);
r = michael_get32(key + 4);
l = get_unaligned_le32(key);
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 */
l ^= michael_get32(da);
l ^= get_unaligned_le32(da);
michael_block(l, r);
l ^= da[4] | (da[5] << 8) | (sa[0] << 16) | (sa[1] << 24);
l ^= get_unaligned_le16(&da[4]) | (get_unaligned_le16(sa) << 16);
michael_block(l, r);
l ^= michael_get32(&sa[2]);
l ^= get_unaligned_le32(&sa[2]);
michael_block(l, r);
l ^= priority;
michael_block(l, r);
@ -82,7 +50,7 @@ void michael_mic(u8 *key, u8 *da, u8 *sa, u8 priority,
left = data_len % 4;
for (block = 0; block < blocks; block++) {
l ^= michael_get32(&data[block * 4]);
l ^= get_unaligned_le32(&data[block * 4]);
michael_block(l, r);
}
@ -99,6 +67,6 @@ void michael_mic(u8 *key, u8 *da, u8 *sa, u8 priority,
/* last block is zero, so l ^ 0 = l */
michael_block(l, r);
michael_put32(l, mic);
michael_put32(r, mic + 4);
put_unaligned_le32(l, mic);
put_unaligned_le32(r, mic + 4);
}