mirror of
https://github.com/torvalds/linux.git
synced 2024-12-26 21:02:19 +00:00
1da177e4c3
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
182 lines
3.4 KiB
C
182 lines
3.4 KiB
C
/*
|
|
* Cryptographic API
|
|
*
|
|
* Michael MIC (IEEE 802.11i/TKIP) keyed digest
|
|
*
|
|
* Copyright (c) 2004 Jouni Malinen <jkmaline@cc.hut.fi>
|
|
*
|
|
* 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/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/string.h>
|
|
#include <linux/crypto.h>
|
|
|
|
|
|
struct michael_mic_ctx {
|
|
u8 pending[4];
|
|
size_t pending_len;
|
|
|
|
u32 l, r;
|
|
};
|
|
|
|
|
|
static inline u32 xswap(u32 val)
|
|
{
|
|
return ((val & 0x00ff00ff) << 8) | ((val & 0xff00ff00) >> 8);
|
|
}
|
|
|
|
|
|
#define michael_block(l, r) \
|
|
do { \
|
|
r ^= rol32(l, 17); \
|
|
l += r; \
|
|
r ^= xswap(l); \
|
|
l += r; \
|
|
r ^= rol32(l, 3); \
|
|
l += r; \
|
|
r ^= ror32(l, 2); \
|
|
l += r; \
|
|
} while (0)
|
|
|
|
|
|
static inline u32 get_le32(const u8 *p)
|
|
{
|
|
return p[0] | (p[1] << 8) | (p[2] << 16) | (p[3] << 24);
|
|
}
|
|
|
|
|
|
static inline void put_le32(u8 *p, u32 v)
|
|
{
|
|
p[0] = v;
|
|
p[1] = v >> 8;
|
|
p[2] = v >> 16;
|
|
p[3] = v >> 24;
|
|
}
|
|
|
|
|
|
static void michael_init(void *ctx)
|
|
{
|
|
struct michael_mic_ctx *mctx = ctx;
|
|
mctx->pending_len = 0;
|
|
}
|
|
|
|
|
|
static void michael_update(void *ctx, const u8 *data, unsigned int len)
|
|
{
|
|
struct michael_mic_ctx *mctx = ctx;
|
|
|
|
if (mctx->pending_len) {
|
|
int flen = 4 - mctx->pending_len;
|
|
if (flen > len)
|
|
flen = len;
|
|
memcpy(&mctx->pending[mctx->pending_len], data, flen);
|
|
mctx->pending_len += flen;
|
|
data += flen;
|
|
len -= flen;
|
|
|
|
if (mctx->pending_len < 4)
|
|
return;
|
|
|
|
mctx->l ^= get_le32(mctx->pending);
|
|
michael_block(mctx->l, mctx->r);
|
|
mctx->pending_len = 0;
|
|
}
|
|
|
|
while (len >= 4) {
|
|
mctx->l ^= get_le32(data);
|
|
michael_block(mctx->l, mctx->r);
|
|
data += 4;
|
|
len -= 4;
|
|
}
|
|
|
|
if (len > 0) {
|
|
mctx->pending_len = len;
|
|
memcpy(mctx->pending, data, len);
|
|
}
|
|
}
|
|
|
|
|
|
static void michael_final(void *ctx, u8 *out)
|
|
{
|
|
struct michael_mic_ctx *mctx = ctx;
|
|
u8 *data = mctx->pending;
|
|
|
|
/* Last block and padding (0x5a, 4..7 x 0) */
|
|
switch (mctx->pending_len) {
|
|
case 0:
|
|
mctx->l ^= 0x5a;
|
|
break;
|
|
case 1:
|
|
mctx->l ^= data[0] | 0x5a00;
|
|
break;
|
|
case 2:
|
|
mctx->l ^= data[0] | (data[1] << 8) | 0x5a0000;
|
|
break;
|
|
case 3:
|
|
mctx->l ^= data[0] | (data[1] << 8) | (data[2] << 16) |
|
|
0x5a000000;
|
|
break;
|
|
}
|
|
michael_block(mctx->l, mctx->r);
|
|
/* l ^= 0; */
|
|
michael_block(mctx->l, mctx->r);
|
|
|
|
put_le32(out, mctx->l);
|
|
put_le32(out + 4, mctx->r);
|
|
}
|
|
|
|
|
|
static int michael_setkey(void *ctx, const u8 *key, unsigned int keylen,
|
|
u32 *flags)
|
|
{
|
|
struct michael_mic_ctx *mctx = ctx;
|
|
if (keylen != 8) {
|
|
if (flags)
|
|
*flags = CRYPTO_TFM_RES_BAD_KEY_LEN;
|
|
return -EINVAL;
|
|
}
|
|
mctx->l = get_le32(key);
|
|
mctx->r = get_le32(key + 4);
|
|
return 0;
|
|
}
|
|
|
|
|
|
static struct crypto_alg michael_mic_alg = {
|
|
.cra_name = "michael_mic",
|
|
.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
|
|
.cra_blocksize = 8,
|
|
.cra_ctxsize = sizeof(struct michael_mic_ctx),
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(michael_mic_alg.cra_list),
|
|
.cra_u = { .digest = {
|
|
.dia_digestsize = 8,
|
|
.dia_init = michael_init,
|
|
.dia_update = michael_update,
|
|
.dia_final = michael_final,
|
|
.dia_setkey = michael_setkey } }
|
|
};
|
|
|
|
|
|
static int __init michael_mic_init(void)
|
|
{
|
|
return crypto_register_alg(&michael_mic_alg);
|
|
}
|
|
|
|
|
|
static void __exit michael_mic_exit(void)
|
|
{
|
|
crypto_unregister_alg(&michael_mic_alg);
|
|
}
|
|
|
|
|
|
module_init(michael_mic_init);
|
|
module_exit(michael_mic_exit);
|
|
|
|
MODULE_LICENSE("GPL v2");
|
|
MODULE_DESCRIPTION("Michael MIC");
|
|
MODULE_AUTHOR("Jouni Malinen <jkmaline@cc.hut.fi>");
|