linux-imx

/* GPL HEADER START

 *

 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 only,

 * as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful, but

 * WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU

 * General Public License version 2 for more details (a copy is included

 * in the LICENSE file that accompanied this code).

 *

 * You should have received a copy of the GNU General Public License

 * version 2 along with this program; If not, see http://www.gnu.org/licenses

 *

 * Please  visit http://www.xyratex.com/contact if you need additional

 * information or have any questions.

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 * GPL HEADER END

 */

​

/*

 * Copyright 2012 Xyratex Technology Limited

 */

​

/*

 * This is crypto api shash wrappers to crc32_le.

 */

​

#include <asm/unaligned.h>

#include <linux/crc32.h>

#include <crypto/internal/hash.h>

#include <linux/init.h>

#include <linux/module.h>

#include <linux/string.h>

#include <linux/kernel.h>

​

#define CHKSUM_BLOCK_SIZE   1

#define CHKSUM_DIGEST_SIZE  4

​

/** No default init with ~0 */

static int crc32_cra_init(struct crypto_tfm *tfm)

{

    u32 *key = crypto_tfm_ctx(tfm);

​

    *key = 0;

​

    return 0;

}

​

/*

 * Setting the seed allows arbitrary accumulators and flexible XOR policy

 * If your algorithm starts with ~0, then XOR with ~0 before you set

 * the seed.

 */

static int crc32_setkey(struct crypto_shash *hash, const u8 *key,

            unsigned int keylen)

{

    u32 *mctx = crypto_shash_ctx(hash);

​

    if (keylen != sizeof(u32)) {