linux-imx

/**

 * AES XTS routines supporting VMX In-core instructions on Power 8

 *

 * Copyright (C) 2015 International Business Machines Inc.

 *

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

 * it under the terms of the GNU General Public License as published by

 * the Free Software Foundations; version 2 only.

 *

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

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY of FITNESS FOR A PARTICUPAR PURPOSE. See the

 * GNU General Public License for more details.

 *

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

 * along with this program; if not, write to the Free Software

 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.

 *

 * Author: Leonidas S. Barbosa <leosilva@linux.vnet.ibm.com>

 */

​

#include <linux/types.h>

#include <linux/err.h>

#include <linux/crypto.h>

#include <linux/delay.h>

#include <linux/hardirq.h>

#include <asm/switch_to.h>

#include <crypto/aes.h>

#include <crypto/scatterwalk.h>

#include <crypto/xts.h>

#include <crypto/skcipher.h>

​

#include "aesp8-ppc.h"

​

struct p8_aes_xts_ctx {

    struct crypto_sync_skcipher *fallback;

    struct aes_key enc_key;

    struct aes_key dec_key;

    struct aes_key tweak_key;

};

​

static int p8_aes_xts_init(struct crypto_tfm *tfm)

{

    const char *alg = crypto_tfm_alg_name(tfm);

    struct crypto_sync_skcipher *fallback;

    struct p8_aes_xts_ctx *ctx = crypto_tfm_ctx(tfm);

​

    fallback = crypto_alloc_sync_skcipher(alg, 0,

                          CRYPTO_ALG_NEED_FALLBACK);

    if (IS_ERR(fallback)) {

        printk(KERN_ERR

            "Failed to allocate transformation for '%s': %ld\n",

            alg, PTR_ERR(fallback));

        return PTR_ERR(fallback);

    }

​

    crypto_sync_skcipher_set_flags(

        fallback,

        crypto_skcipher_get_flags((struct crypto_skcipher *)tfm));

    ctx->fallback = fallback;

​

    return 0;

}