root/crypto/ecb.c

DEFINITIONS

1. crypto_ecb_setkey
2. crypto_ecb_crypt
3. crypto_ecb_encrypt
4. crypto_ecb_decrypt
5. crypto_ecb_init_tfm
6. crypto_ecb_exit_tfm
7. crypto_ecb_alloc
8. crypto_ecb_free
9. crypto_ecb_module_init
10. crypto_ecb_module_exit

/*
 * 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 <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/scatterlist.h>
#include <linux/slab.h>

struct crypto_ecb_ctx {
        struct crypto_cipher *child;
};

static int crypto_ecb_setkey(struct crypto_tfm *parent, const u8 *key,
                             unsigned int keylen)
{
        struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(parent);
        struct crypto_cipher *child = ctx->child;
        int err;

        crypto_cipher_clear_flags(child, CRYPTO_TFM_REQ_MASK);
        crypto_cipher_set_flags(child, crypto_tfm_get_flags(parent) &
                                       CRYPTO_TFM_REQ_MASK);
        err = crypto_cipher_setkey(child, key, keylen);
        crypto_tfm_set_flags(parent, crypto_cipher_get_flags(child) &
                                     CRYPTO_TFM_RES_MASK);
        return err;
}

static int crypto_ecb_crypt(struct blkcipher_desc *desc,
                            struct blkcipher_walk *walk,
                            struct crypto_cipher *tfm,
                            void (*fn)(struct crypto_tfm *, u8 *, const u8 *))
{
        int bsize = crypto_cipher_blocksize(tfm);
        unsigned int nbytes;
        int err;

        err = blkcipher_walk_virt(desc, walk);

        while ((nbytes = walk->nbytes)) {
                u8 *wsrc = walk->src.virt.addr;
                u8 *wdst = walk->dst.virt.addr;

                do {
                        fn(crypto_cipher_tfm(tfm), wdst, wsrc);
        
                        wsrc += bsize;
                        wdst += bsize;
                } while ((nbytes -= bsize) >= bsize);

                err = blkcipher_walk_done(desc, walk, nbytes);
        }

        return err;
}

static int crypto_ecb_encrypt(struct blkcipher_desc *desc,
                              struct scatterlist *dst, struct scatterlist *src,
                              unsigned int nbytes)
{
        struct blkcipher_walk walk;
        struct crypto_blkcipher *tfm = desc->tfm;
        struct crypto_ecb_ctx *ctx = crypto_blkcipher_ctx(tfm);
        struct crypto_cipher *child = ctx->child;

        blkcipher_walk_init(&walk, dst, src, nbytes);
        return crypto_ecb_crypt(desc, &walk, child,
                                crypto_cipher_alg(child)->cia_encrypt);
}

static int crypto_ecb_decrypt(struct blkcipher_desc *desc,
                              struct scatterlist *dst, struct scatterlist *src,
                              unsigned int nbytes)
{
        struct blkcipher_walk walk;
        struct crypto_blkcipher *tfm = desc->tfm;
        struct crypto_ecb_ctx *ctx = crypto_blkcipher_ctx(tfm);
        struct crypto_cipher *child = ctx->child;

        blkcipher_walk_init(&walk, dst, src, nbytes);
        return crypto_ecb_crypt(desc, &walk, child,
                                crypto_cipher_alg(child)->cia_decrypt);
}

static int crypto_ecb_init_tfm(struct crypto_tfm *tfm)
{
        struct crypto_instance *inst = (void *)tfm->__crt_alg;
        struct crypto_spawn *spawn = crypto_instance_ctx(inst);
        struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(tfm);
        struct crypto_cipher *cipher;

        cipher = crypto_spawn_cipher(spawn);
        if (IS_ERR(cipher))
                return PTR_ERR(cipher);

        ctx->child = cipher;
        return 0;
}

static void crypto_ecb_exit_tfm(struct crypto_tfm *tfm)
{
        struct crypto_ecb_ctx *ctx = crypto_tfm_ctx(tfm);
        crypto_free_cipher(ctx->child);
}

static struct crypto_instance *crypto_ecb_alloc(struct rtattr **tb)
{
        struct crypto_instance *inst;
        struct crypto_alg *alg;
        int err;

        err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_BLKCIPHER);
        if (err)
                return ERR_PTR(err);

        alg = crypto_get_attr_alg(tb, CRYPTO_ALG_TYPE_CIPHER,
                                  CRYPTO_ALG_TYPE_MASK);
        if (IS_ERR(alg))
                return ERR_CAST(alg);

        inst = crypto_alloc_instance("ecb", alg);
        if (IS_ERR(inst))
                goto out_put_alg;

        inst->alg.cra_flags = CRYPTO_ALG_TYPE_BLKCIPHER;
        inst->alg.cra_priority = alg->cra_priority;
        inst->alg.cra_blocksize = alg->cra_blocksize;
        inst->alg.cra_alignmask = alg->cra_alignmask;
        inst->alg.cra_type = &crypto_blkcipher_type;

        inst->alg.cra_blkcipher.min_keysize = alg->cra_cipher.cia_min_keysize;
        inst->alg.cra_blkcipher.max_keysize = alg->cra_cipher.cia_max_keysize;

        inst->alg.cra_ctxsize = sizeof(struct crypto_ecb_ctx);

        inst->alg.cra_init = crypto_ecb_init_tfm;
        inst->alg.cra_exit = crypto_ecb_exit_tfm;

        inst->alg.cra_blkcipher.setkey = crypto_ecb_setkey;
        inst->alg.cra_blkcipher.encrypt = crypto_ecb_encrypt;
        inst->alg.cra_blkcipher.decrypt = crypto_ecb_decrypt;

out_put_alg:
        crypto_mod_put(alg);
        return inst;
}

static void crypto_ecb_free(struct crypto_instance *inst)
{
        crypto_drop_spawn(crypto_instance_ctx(inst));
        kfree(inst);
}

static struct crypto_template crypto_ecb_tmpl = {
        .name = "ecb",
        .alloc = crypto_ecb_alloc,
        .free = crypto_ecb_free,
        .module = THIS_MODULE,
};

static int __init crypto_ecb_module_init(void)
{
        return crypto_register_template(&crypto_ecb_tmpl);
}

static void __exit crypto_ecb_module_exit(void)
{
        crypto_unregister_template(&crypto_ecb_tmpl);
}

module_init(crypto_ecb_module_init);
module_exit(crypto_ecb_module_exit);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("ECB block cipher algorithm");