/crypto/crypto_null.c
https://bitbucket.org/evzijst/gittest · C · 137 lines · 98 code · 21 blank · 18 comment · 3 complexity · c34bc347e12e68a270ebb83dcc7696fc MD5 · raw file
- /*
- * 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");