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crypto: michael_mic - Switch to shash

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This patch changes michael_mic to the new shash interface.

Signed-off-by: Adrian-Ken Rueegsegger <ken@codelabs.ch>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
This commit is contained in:
Adrian-Ken Rueegsegger 2008-12-07 19:35:38 +08:00 committed by Herbert Xu
parent 4946510baa
commit 19e2bf1467
2 changed files with 42 additions and 32 deletions
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2
crypto/Kconfig
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@ -288,7 +288,7 @@ config CRYPTO_MD5
config CRYPTO_MICHAEL_MIC
tristate "Michael MIC keyed digest algorithm"
select CRYPTO_ALGAPI
select CRYPTO_HASH
help
Michael MIC is used for message integrity protection in TKIP
(IEEE 802.11i). This algorithm is required for TKIP, but it

72
crypto/michael_mic.c
View File

@ -9,23 +9,25 @@
* it under the terms of the GNU General Public License version 2 as
* published by the Free Software Foundation.
*/
#include <crypto/internal/hash.h>
#include <asm/byteorder.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/string.h>
#include <linux/crypto.h>
#include <linux/types.h>
struct michael_mic_ctx {
u32 l, r;
};
struct michael_mic_desc_ctx {
u8 pending[4];
size_t pending_len;
u32 l, r;
};
static inline u32 xswap(u32 val)
{
return ((val & 0x00ff00ff) << 8) | ((val & 0xff00ff00) >> 8);
@ -45,17 +47,22 @@ do { \
} while (0)
static void michael_init(struct crypto_tfm *tfm)
static int michael_init(struct shash_desc *desc)
{
struct michael_mic_ctx *mctx = crypto_tfm_ctx(tfm);
struct michael_mic_desc_ctx *mctx = shash_desc_ctx(desc);
struct michael_mic_ctx *ctx = crypto_shash_ctx(desc->tfm);
mctx->pending_len = 0;
mctx->l = ctx->l;
mctx->r = ctx->r;
return 0;
}
static void michael_update(struct crypto_tfm *tfm, const u8 *data,
static int michael_update(struct shash_desc *desc, const u8 *data,
unsigned int len)
{
struct michael_mic_ctx *mctx = crypto_tfm_ctx(tfm);
struct michael_mic_desc_ctx *mctx = shash_desc_ctx(desc);
const __le32 *src;
if (mctx->pending_len) {
@ -68,7 +75,7 @@ static void michael_update(struct crypto_tfm *tfm, const u8 *data,
len -= flen;
if (mctx->pending_len < 4)
return;
return 0;
src = (const __le32 *)mctx->pending;
mctx->l ^= le32_to_cpup(src);
@ -88,12 +95,14 @@ static void michael_update(struct crypto_tfm *tfm, const u8 *data,
mctx->pending_len = len;
memcpy(mctx->pending, src, len);
}
return 0;
}
static void michael_final(struct crypto_tfm *tfm, u8 *out)
static int michael_final(struct shash_desc *desc, u8 *out)
{
struct michael_mic_ctx *mctx = crypto_tfm_ctx(tfm);
struct michael_mic_desc_ctx *mctx = shash_desc_ctx(desc);
u8 *data = mctx->pending;
__le32 *dst = (__le32 *)out;
@ -119,17 +128,20 @@ static void michael_final(struct crypto_tfm *tfm, u8 *out)
dst[0] = cpu_to_le32(mctx->l);
dst[1] = cpu_to_le32(mctx->r);
return 0;
}
static int michael_setkey(struct crypto_tfm *tfm, const u8 *key,
static int michael_setkey(struct crypto_shash *tfm, const u8 *key,
unsigned int keylen)
{
struct michael_mic_ctx *mctx = crypto_tfm_ctx(tfm);
struct michael_mic_ctx *mctx = crypto_shash_ctx(tfm);
const __le32 *data = (const __le32 *)key;
if (keylen != 8) {
tfm->crt_flags |= CRYPTO_TFM_RES_BAD_KEY_LEN;
crypto_shash_set_flags(tfm, CRYPTO_TFM_RES_BAD_KEY_LEN);
return -EINVAL;
}
@ -138,33 +150,31 @@ static int michael_setkey(struct crypto_tfm *tfm, const u8 *key,
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_alignmask = 3,
.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 struct shash_alg alg = {
.digestsize = 8,
.setkey = michael_setkey,
.init = michael_init,
.update = michael_update,
.final = michael_final,
.descsize = sizeof(struct michael_mic_desc_ctx),
.base = {
.cra_name = "michael_mic",
.cra_blocksize = 8,
.cra_alignmask = 3,
.cra_ctxsize = sizeof(struct michael_mic_ctx),
.cra_module = THIS_MODULE,
}
};
static int __init michael_mic_init(void)
{
return crypto_register_alg(&michael_mic_alg);
return crypto_register_shash(&alg);
}
static void __exit michael_mic_exit(void)
{
crypto_unregister_alg(&michael_mic_alg);
crypto_unregister_shash(&alg);
}