linux-imx

/*

 * ECB: Electronic CodeBook mode

 *

 * 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/algapi.h>

#include <crypto/internal/skcipher.h>

#include <linux/err.h>

#include <linux/init.h>

#include <linux/kernel.h>

#include <linux/module.h>

​

static int crypto_ecb_crypt(struct skcipher_request *req,

                struct crypto_cipher *cipher,

                void (*fn)(struct crypto_tfm *, u8 *, const u8 *))

{

    const unsigned int bsize = crypto_cipher_blocksize(cipher);

    struct skcipher_walk walk;

    unsigned int nbytes;

    int err;

​

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

​

    while ((nbytes = walk.nbytes) != 0) {

        const u8 *src = walk.src.virt.addr;

        u8 *dst = walk.dst.virt.addr;

​

        do {

            fn(crypto_cipher_tfm(cipher), dst, src);

​

            src += bsize;

            dst += bsize;

        } while ((nbytes -= bsize) >= bsize);

​

        err = skcipher_walk_done(&walk, nbytes);

    }

​

    return err;

}

​

static int crypto_ecb_encrypt(struct skcipher_request *req)

{

    struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);

    struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);

​

    return crypto_ecb_crypt(req, cipher,

                crypto_cipher_alg(cipher)->cia_encrypt);

}

​

static int crypto_ecb_decrypt(struct skcipher_request *req)

{

    struct crypto_skcipher *tfm = crypto_skcipher_reqtfm(req);

    struct crypto_cipher *cipher = skcipher_cipher_simple(tfm);

​

    return crypto_ecb_crypt(req, cipher,

                crypto_cipher_alg(cipher)->cia_decrypt);