138 строки
3.3 KiB
C
138 строки
3.3 KiB
C
/*
|
|
* Cryptographic API.
|
|
*
|
|
* Null algorithms, aka Much Ado About Nothing.
|
|
*
|
|
* These are needed for IPsec, and may be useful in general for
|
|
* testing & debugging.
|
|
*
|
|
* The null cipher is compliant with RFC2410.
|
|
*
|
|
* Copyright (c) 2002 James Morris <jmorris@intercode.com.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 <linux/init.h>
|
|
#include <linux/module.h>
|
|
#include <linux/mm.h>
|
|
#include <asm/scatterlist.h>
|
|
#include <linux/crypto.h>
|
|
|
|
#define NULL_KEY_SIZE 0
|
|
#define NULL_BLOCK_SIZE 1
|
|
#define NULL_DIGEST_SIZE 0
|
|
|
|
static int null_compress(void *ctx, const u8 *src, unsigned int slen,
|
|
u8 *dst, unsigned int *dlen)
|
|
{ return 0; }
|
|
|
|
static int null_decompress(void *ctx, const u8 *src, unsigned int slen,
|
|
u8 *dst, unsigned int *dlen)
|
|
{ return 0; }
|
|
|
|
static void null_init(void *ctx)
|
|
{ }
|
|
|
|
static void null_update(void *ctx, const u8 *data, unsigned int len)
|
|
{ }
|
|
|
|
static void null_final(void *ctx, u8 *out)
|
|
{ }
|
|
|
|
static int null_setkey(void *ctx, const u8 *key,
|
|
unsigned int keylen, u32 *flags)
|
|
{ return 0; }
|
|
|
|
static void null_encrypt(void *ctx, u8 *dst, const u8 *src)
|
|
{ }
|
|
|
|
static void null_decrypt(void *ctx, u8 *dst, const u8 *src)
|
|
{ }
|
|
|
|
static struct crypto_alg compress_null = {
|
|
.cra_name = "compress_null",
|
|
.cra_flags = CRYPTO_ALG_TYPE_COMPRESS,
|
|
.cra_blocksize = NULL_BLOCK_SIZE,
|
|
.cra_ctxsize = 0,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(compress_null.cra_list),
|
|
.cra_u = { .compress = {
|
|
.coa_compress = null_compress,
|
|
.coa_decompress = null_decompress } }
|
|
};
|
|
|
|
static struct crypto_alg digest_null = {
|
|
.cra_name = "digest_null",
|
|
.cra_flags = CRYPTO_ALG_TYPE_DIGEST,
|
|
.cra_blocksize = NULL_BLOCK_SIZE,
|
|
.cra_ctxsize = 0,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(digest_null.cra_list),
|
|
.cra_u = { .digest = {
|
|
.dia_digestsize = NULL_DIGEST_SIZE,
|
|
.dia_init = null_init,
|
|
.dia_update = null_update,
|
|
.dia_final = null_final } }
|
|
};
|
|
|
|
static struct crypto_alg cipher_null = {
|
|
.cra_name = "cipher_null",
|
|
.cra_flags = CRYPTO_ALG_TYPE_CIPHER,
|
|
.cra_blocksize = NULL_BLOCK_SIZE,
|
|
.cra_ctxsize = 0,
|
|
.cra_module = THIS_MODULE,
|
|
.cra_list = LIST_HEAD_INIT(cipher_null.cra_list),
|
|
.cra_u = { .cipher = {
|
|
.cia_min_keysize = NULL_KEY_SIZE,
|
|
.cia_max_keysize = NULL_KEY_SIZE,
|
|
.cia_setkey = null_setkey,
|
|
.cia_encrypt = null_encrypt,
|
|
.cia_decrypt = null_decrypt } }
|
|
};
|
|
|
|
MODULE_ALIAS("compress_null");
|
|
MODULE_ALIAS("digest_null");
|
|
MODULE_ALIAS("cipher_null");
|
|
|
|
static int __init init(void)
|
|
{
|
|
int ret = 0;
|
|
|
|
ret = crypto_register_alg(&cipher_null);
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
ret = crypto_register_alg(&digest_null);
|
|
if (ret < 0) {
|
|
crypto_unregister_alg(&cipher_null);
|
|
goto out;
|
|
}
|
|
|
|
ret = crypto_register_alg(&compress_null);
|
|
if (ret < 0) {
|
|
crypto_unregister_alg(&digest_null);
|
|
crypto_unregister_alg(&cipher_null);
|
|
goto out;
|
|
}
|
|
|
|
out:
|
|
return ret;
|
|
}
|
|
|
|
static void __exit fini(void)
|
|
{
|
|
crypto_unregister_alg(&compress_null);
|
|
crypto_unregister_alg(&digest_null);
|
|
crypto_unregister_alg(&cipher_null);
|
|
}
|
|
|
|
module_init(init);
|
|
module_exit(fini);
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_DESCRIPTION("Null Cryptographic Algorithms");
|