linux-imx

/*

 * AEAD: Authenticated Encryption with Associated Data

 *

 * This file provides API support for AEAD algorithms.

 *

 * Copyright (c) 2007-2015 Herbert Xu <herbert@gondor.apana.org.au>

 *

 * 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 Foundation; either version 2 of the License, or (at your option)

 * any later version.

 *

 */

​

#include <crypto/internal/geniv.h>

#include <crypto/internal/rng.h>

#include <crypto/null.h>

#include <crypto/scatterwalk.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/rtnetlink.h>

#include <linux/slab.h>

#include <linux/seq_file.h>

#include <linux/cryptouser.h>

#include <linux/compiler.h>

#include <net/netlink.h>

​

#include "internal.h"

​

static int setkey_unaligned(struct crypto_aead *tfm, const u8 *key,

                unsigned int keylen)

{

    unsigned long alignmask = crypto_aead_alignmask(tfm);

    int ret;

    u8 *buffer, *alignbuffer;

    unsigned long absize;

​

    absize = keylen + alignmask;

    buffer = kmalloc(absize, GFP_ATOMIC);

    if (!buffer)

        return -ENOMEM;

​

    alignbuffer = (u8 *)ALIGN((unsigned long)buffer, alignmask + 1);

    memcpy(alignbuffer, key, keylen);

    ret = crypto_aead_alg(tfm)->setkey(tfm, alignbuffer, keylen);

    memset(alignbuffer, 0, keylen);

    kfree(buffer);

    return ret;

}

​

int crypto_aead_setkey(struct crypto_aead *tfm,

               const u8 *key, unsigned int keylen)

{

    unsigned long alignmask = crypto_aead_alignmask(tfm);

    int err;

​

    if ((unsigned long)key & alignmask)

        err = setkey_unaligned(tfm, key, keylen);

    else

        err = crypto_aead_alg(tfm)->setkey(tfm, key, keylen);

​