Quelle ecb.c Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* ECB: Electronic CodeBook mode
*
* Copyright (c) 2006 Herbert Xu <herbert@gondor.apana.org.au>
*/

#include <crypto/internal/cipher.h>
#include <crypto/internal/skcipher.h>
#include <linux/err.h>
#include <linux/init.h>
#include <linux/kernel.h>
#include <linux/module.h>
#include <linux/slab.h>

static int crypto_ecb_crypt(struct crypto_cipher *cipher, const u8 *src,
       u8 *dst, unsigned nbytes, bool final,
       void (*fn)(struct crypto_tfm *, u8 *, const u8 *))
{
const unsigned int bsize = crypto_cipher_blocksize(cipher);

while (nbytes >= bsize) {
  fn(crypto_cipher_tfm(cipher), dst, src);

  src += bsize;
  dst += bsize;

  nbytes -= bsize;
}

return nbytes && final ? -EINVAL : nbytes;
}

static int crypto_ecb_encrypt2(struct crypto_lskcipher *tfm, const u8 *src,
          u8 *dst, unsigned len, u8 *iv, u32 flags)
{
struct crypto_cipher **ctx = crypto_lskcipher_ctx(tfm);
struct crypto_cipher *cipher = *ctx;

return crypto_ecb_crypt(cipher, src, dst, len,
    flags & CRYPTO_LSKCIPHER_FLAG_FINAL,
    crypto_cipher_alg(cipher)->cia_encrypt);
}

static int crypto_ecb_decrypt2(struct crypto_lskcipher *tfm, const u8 *src,
          u8 *dst, unsigned len, u8 *iv, u32 flags)
{
struct crypto_cipher **ctx = crypto_lskcipher_ctx(tfm);
struct crypto_cipher *cipher = *ctx;

return crypto_ecb_crypt(cipher, src, dst, len,
    flags & CRYPTO_LSKCIPHER_FLAG_FINAL,
    crypto_cipher_alg(cipher)->cia_decrypt);
}

static int lskcipher_setkey_simple2(struct crypto_lskcipher *tfm,
        const u8 *key, unsigned int keylen)
{
struct crypto_cipher **ctx = crypto_lskcipher_ctx(tfm);
struct crypto_cipher *cipher = *ctx;

crypto_cipher_clear_flags(cipher, CRYPTO_TFM_REQ_MASK);
crypto_cipher_set_flags(cipher, crypto_lskcipher_get_flags(tfm) &
    CRYPTO_TFM_REQ_MASK);
return crypto_cipher_setkey(cipher, key, keylen);
}

static int lskcipher_init_tfm_simple2(struct crypto_lskcipher *tfm)
{
struct lskcipher_instance *inst = lskcipher_alg_instance(tfm);
struct crypto_cipher **ctx = crypto_lskcipher_ctx(tfm);
struct crypto_cipher_spawn *spawn;
struct crypto_cipher *cipher;

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

*ctx = cipher;
return 0;
}

static void lskcipher_exit_tfm_simple2(struct crypto_lskcipher *tfm)
{
struct crypto_cipher **ctx = crypto_lskcipher_ctx(tfm);

crypto_free_cipher(*ctx);
}

static void lskcipher_free_instance_simple2(struct lskcipher_instance *inst)
{
crypto_drop_cipher(lskcipher_instance_ctx(inst));
kfree(inst);
}

static struct lskcipher_instance *lskcipher_alloc_instance_simple2(
struct crypto_template *tmpl, struct rtattr **tb)
{
struct crypto_cipher_spawn *spawn;
struct lskcipher_instance *inst;
struct crypto_alg *cipher_alg;
u32 mask;
int err;

err = crypto_check_attr_type(tb, CRYPTO_ALG_TYPE_LSKCIPHER, &mask);
if (err)
  return ERR_PTR(err);

inst = kzalloc(sizeof(*inst) + sizeof(*spawn), GFP_KERNEL);
if (!inst)
  return ERR_PTR(-ENOMEM);
spawn = lskcipher_instance_ctx(inst);

err = crypto_grab_cipher(spawn, lskcipher_crypto_instance(inst),
     crypto_attr_alg_name(tb[1]), 0, mask);
if (err)
  goto err_free_inst;
cipher_alg = crypto_spawn_cipher_alg(spawn);

err = crypto_inst_setname(lskcipher_crypto_instance(inst), tmpl->name,
      cipher_alg);
if (err)
  goto err_free_inst;

inst->free = lskcipher_free_instance_simple2;

/* Default algorithm properties, can be overridden */
inst->alg.co.base.cra_blocksize = cipher_alg->cra_blocksize;
inst->alg.co.base.cra_alignmask = cipher_alg->cra_alignmask;
inst->alg.co.base.cra_priority = cipher_alg->cra_priority;
inst->alg.co.min_keysize = cipher_alg->cra_cipher.cia_min_keysize;
inst->alg.co.max_keysize = cipher_alg->cra_cipher.cia_max_keysize;
inst->alg.co.ivsize = cipher_alg->cra_blocksize;

/* Use struct crypto_cipher * by default, can be overridden */
inst->alg.co.base.cra_ctxsize = sizeof(struct crypto_cipher *);
inst->alg.setkey = lskcipher_setkey_simple2;
inst->alg.init = lskcipher_init_tfm_simple2;
inst->alg.exit = lskcipher_exit_tfm_simple2;

return inst;

err_free_inst:
lskcipher_free_instance_simple2(inst);
return ERR_PTR(err);
}

static int crypto_ecb_create2(struct crypto_template *tmpl, struct rtattr **tb)
{
struct lskcipher_instance *inst;
int err;

inst = lskcipher_alloc_instance_simple2(tmpl, tb);
if (IS_ERR(inst))
  return PTR_ERR(inst);

/* ECB mode doesn't take an IV */
inst->alg.co.ivsize = 0;

inst->alg.encrypt = crypto_ecb_encrypt2;
inst->alg.decrypt = crypto_ecb_decrypt2;

err = lskcipher_register_instance(tmpl, inst);
if (err)
  inst->free(inst);

return err;
}

static int crypto_ecb_create(struct crypto_template *tmpl, struct rtattr **tb)
{
struct crypto_lskcipher_spawn *spawn;
struct lskcipher_alg *cipher_alg;
struct lskcipher_instance *inst;
int err;

inst = lskcipher_alloc_instance_simple(tmpl, tb);
if (IS_ERR(inst)) {
  err = crypto_ecb_create2(tmpl, tb);
  return err;
}

spawn = lskcipher_instance_ctx(inst);
cipher_alg = crypto_lskcipher_spawn_alg(spawn);

/* ECB mode doesn't take an IV */
inst->alg.co.ivsize = 0;
if (cipher_alg->co.ivsize)
  return -EINVAL;

inst->alg.co.base.cra_ctxsize = cipher_alg->co.base.cra_ctxsize;
inst->alg.setkey = cipher_alg->setkey;
inst->alg.encrypt = cipher_alg->encrypt;
inst->alg.decrypt = cipher_alg->decrypt;
inst->alg.init = cipher_alg->init;
inst->alg.exit = cipher_alg->exit;

err = lskcipher_register_instance(tmpl, inst);
if (err)
  inst->free(inst);

return err;
}

static struct crypto_template crypto_ecb_tmpl = {
.name = "ecb",
.create = crypto_ecb_create,
.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 mode of operation");
MODULE_ALIAS_CRYPTO("ecb");
MODULE_IMPORT_NS("CRYPTO_INTERNAL");

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