Quelle des_generic.c Sprache: C

// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Cryptographic API.
*
* DES & Triple DES EDE Cipher Algorithms.
*
* Copyright (c) 2005 Dag Arne Osvik <da@osvik.no>
*/

#include <asm/byteorder.h>
#include <crypto/algapi.h>
#include <linux/bitops.h>
#include <linux/init.h>
#include <linux/module.h>
#include <linux/errno.h>

#include <crypto/internal/des.h>

static int des_setkey(struct crypto_tfm *tfm, const u8 *key,
        unsigned int keylen)
{
struct des_ctx *dctx = crypto_tfm_ctx(tfm);
int err;

err = des_expand_key(dctx, key, keylen);
if (err == -ENOKEY) {
  if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)
   err = -EINVAL;
  else
   err = 0;
}
if (err)
  memset(dctx, 0, sizeof(*dctx));
return err;
}

static void crypto_des_encrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
const struct des_ctx *dctx = crypto_tfm_ctx(tfm);

des_encrypt(dctx, dst, src);
}

static void crypto_des_decrypt(struct crypto_tfm *tfm, u8 *dst, const u8 *src)
{
const struct des_ctx *dctx = crypto_tfm_ctx(tfm);

des_decrypt(dctx, dst, src);
}

static int des3_ede_setkey(struct crypto_tfm *tfm, const u8 *key,
      unsigned int keylen)
{
struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);
int err;

err = des3_ede_expand_key(dctx, key, keylen);
if (err == -ENOKEY) {
  if (crypto_tfm_get_flags(tfm) & CRYPTO_TFM_REQ_FORBID_WEAK_KEYS)
   err = -EINVAL;
  else
   err = 0;
}
if (err)
  memset(dctx, 0, sizeof(*dctx));
return err;
}

static void crypto_des3_ede_encrypt(struct crypto_tfm *tfm, u8 *dst,
        const u8 *src)
{
const struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);

des3_ede_encrypt(dctx, dst, src);
}

static void crypto_des3_ede_decrypt(struct crypto_tfm *tfm, u8 *dst,
        const u8 *src)
{
const struct des3_ede_ctx *dctx = crypto_tfm_ctx(tfm);

des3_ede_decrypt(dctx, dst, src);
}

static struct crypto_alg des_algs[2] = { {
.cra_name  = "des",
.cra_driver_name = "des-generic",
.cra_priority  = 100,
.cra_flags  = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize  = DES_BLOCK_SIZE,
.cra_ctxsize  = sizeof(struct des_ctx),
.cra_module  = THIS_MODULE,
.cra_u   = { .cipher = {
.cia_min_keysize = DES_KEY_SIZE,
.cia_max_keysize = DES_KEY_SIZE,
.cia_setkey  = des_setkey,
.cia_encrypt  = crypto_des_encrypt,
.cia_decrypt  = crypto_des_decrypt } }
}, {
.cra_name  = "des3_ede",
.cra_driver_name = "des3_ede-generic",
.cra_priority  = 100,
.cra_flags  = CRYPTO_ALG_TYPE_CIPHER,
.cra_blocksize  = DES3_EDE_BLOCK_SIZE,
.cra_ctxsize  = sizeof(struct des3_ede_ctx),
.cra_module  = THIS_MODULE,
.cra_u   = { .cipher = {
.cia_min_keysize = DES3_EDE_KEY_SIZE,
.cia_max_keysize = DES3_EDE_KEY_SIZE,
.cia_setkey  = des3_ede_setkey,
.cia_encrypt  = crypto_des3_ede_encrypt,
.cia_decrypt  = crypto_des3_ede_decrypt } }
} };

static int __init des_generic_mod_init(void)
{
return crypto_register_algs(des_algs, ARRAY_SIZE(des_algs));
}

static void __exit des_generic_mod_fini(void)
{
crypto_unregister_algs(des_algs, ARRAY_SIZE(des_algs));
}

module_init(des_generic_mod_init);
module_exit(des_generic_mod_fini);

MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("DES & Triple DES EDE Cipher Algorithms");
MODULE_AUTHOR("Dag Arne Osvik ");
MODULE_ALIAS_CRYPTO("des");
MODULE_ALIAS_CRYPTO("des-generic");
MODULE_ALIAS_CRYPTO("des3_ede");
MODULE_ALIAS_CRYPTO("des3_ede-generic");

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