linux-imx

// SPDX-License-Identifier: GPL-2.0-or-later

/*

 * Asynchronous block chaining cipher operations.

 *

 * This is the asynchronous version of blkcipher.c indicating completion

 * via a callback.

 *

 * Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>

 */

​

#include <crypto/internal/skcipher.h>

#include <linux/err.h>

#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/seq_file.h>

#include <linux/cryptouser.h>

#include <linux/compiler.h>

#include <net/netlink.h>

​

#include <crypto/scatterwalk.h>

​

#include "internal.h"

​

struct ablkcipher_buffer {

    struct list_head    entry;

    struct scatter_walk dst;

    unsigned int        len;

    void            *data;

};

​

enum {

    ABLKCIPHER_WALK_SLOW = 1 << 0,

};

​

static inline void ablkcipher_buffer_write(struct ablkcipher_buffer *p)

{

    scatterwalk_copychunks(p->data, &p->dst, p->len, 1);

}

​

void __ablkcipher_walk_complete(struct ablkcipher_walk *walk)

{

    struct ablkcipher_buffer *p, *tmp;

​

    list_for_each_entry_safe(p, tmp, &walk->buffers, entry) {

        ablkcipher_buffer_write(p);

        list_del(&p->entry);

        kfree(p);

    }

}

EXPORT_SYMBOL_GPL(__ablkcipher_walk_complete);

​

static inline void ablkcipher_queue_write(struct ablkcipher_walk *walk,

                      struct ablkcipher_buffer *p)

{

    p->dst = walk->out;

    list_add_tail(&p->entry, &walk->buffers);

}

​

/* Get a spot of the specified length that does not straddle a page.

 * The caller needs to ensure that there is enough space for this operation.

 */

static inline u8 *ablkcipher_get_spot(u8 *start, unsigned int len)

{