linux-imx

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

/*

 * CBC: Cipher Block Chaining mode

 *

 * Copyright (c) 2006-2016 Herbert Xu <herbert@gondor.apana.org.au>

 */

​

#include <crypto/algapi.h>

#include <crypto/cbc.h>

#include <crypto/internal/skcipher.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/log2.h>

#include <linux/module.h>

​

static inline void crypto_cbc_encrypt_one(struct crypto_skcipher *tfm,

                      const u8 *src, u8 *dst)

{

    crypto_cipher_encrypt_one(skcipher_cipher_simple(tfm), dst, src);

}

​

static int crypto_cbc_encrypt(struct skcipher_request *req)

{

    return crypto_cbc_encrypt_walk(req, crypto_cbc_encrypt_one);

}

​

static inline void crypto_cbc_decrypt_one(struct crypto_skcipher *tfm,

                      const u8 *src, u8 *dst)

{

    crypto_cipher_decrypt_one(skcipher_cipher_simple(tfm), dst, src);

}

​

static int crypto_cbc_decrypt(struct skcipher_request *req)

{

    struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);

    struct skcipher_walk walk;

    int err;

​

    err = skcipher_walk_virt(&walk, req, false);

​

    while (walk.nbytes) {

        err = crypto_cbc_decrypt_blocks(&walk, tfm,

                        crypto_cbc_decrypt_one);

        err = skcipher_walk_done(&walk, err);

    }

​

    return err;

}

​

static int crypto_cbc_create(struct crypto_template *tmpl, struct rtattr **tb)

{

    struct skcipher_instance *inst;

    struct crypto_alg *alg;

    int err;

​

    inst = skcipher_alloc_instance_simple(tmpl, tb, &alg);

    if (IS_ERR(inst))

        return PTR_ERR(inst);

​

    err = -EINVAL;

    if (!is_power_of_2(alg->cra_blocksize))

        goto out_free_inst;