linux-imx

/*

 * Block chaining cipher operations.

 *

 * Generic encrypt/decrypt wrapper for ciphers, handles operations across

 * multiple page boundaries by using temporary blocks.  In user context,

 * the kernel is given a chance to schedule us once per page.

 *

 * Copyright (c) 2006 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/aead.h>

#include <crypto/internal/skcipher.h>

#include <crypto/scatterwalk.h>

#include <linux/errno.h>

#include <linux/kernel.h>

#include <linux/module.h>

#include <linux/seq_file.h>

#include <linux/slab.h>

#include <linux/string.h>

#include <linux/cryptouser.h>

#include <linux/compiler.h>

#include <net/netlink.h>

​

#include "internal.h"

​

enum {

    BLKCIPHER_WALK_PHYS = 1 << 0,

    BLKCIPHER_WALK_SLOW = 1 << 1,

    BLKCIPHER_WALK_COPY = 1 << 2,

    BLKCIPHER_WALK_DIFF = 1 << 3,

};

​

static int blkcipher_walk_next(struct blkcipher_desc *desc,

                   struct blkcipher_walk *walk);

static int blkcipher_walk_first(struct blkcipher_desc *desc,

                struct blkcipher_walk *walk);

​

static inline void blkcipher_map_src(struct blkcipher_walk *walk)

{

    walk->src.virt.addr = scatterwalk_map(&walk->in);

}

​

static inline void blkcipher_map_dst(struct blkcipher_walk *walk)

{

    walk->dst.virt.addr = scatterwalk_map(&walk->out);

}

​

static inline void blkcipher_unmap_src(struct blkcipher_walk *walk)

{

    scatterwalk_unmap(walk->src.virt.addr);

}

​

static inline void blkcipher_unmap_dst(struct blkcipher_walk *walk)

{

    scatterwalk_unmap(walk->dst.virt.addr);

}

​