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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - crypto/crypto_null.c
4 * Null algorithms, aka Much Ado About Nothing.
6 * These are needed for IPsec, and may be useful in general for
9 * The null cipher is compliant with RFC2410.
11 * Copyright (c) 2002 James Morris <jmorris@intercode.com.au>
13 * This program is free software; you can redistribute it and/or modify
14 * it under the terms of the GNU General Public License as published by
15 * the Free Software Foundation; either version 2 of the License, or
16 * (at your option) any later version.
19 #include <linux/init.h>
20 #include <linux/module.h>
22 #include <asm/scatterlist.h>
23 #include <linux/crypto.h>
24 #include <linux/string.h>
26 #define NULL_KEY_SIZE 0
27 #define NULL_BLOCK_SIZE 1
28 #define NULL_DIGEST_SIZE 0
30 static int null_compress(void *ctx
, const u8
*src
, unsigned int slen
,
31 u8
*dst
, unsigned int *dlen
)
35 memcpy(dst
, src
, slen
);
40 static void null_init(void *ctx
)
43 static void null_update(void *ctx
, const u8
*data
, unsigned int len
)
46 static void null_final(void *ctx
, u8
*out
)
49 static int null_setkey(void *ctx
, const u8
*key
,
50 unsigned int keylen
, u32
*flags
)
53 static void null_crypt(void *ctx
, u8
*dst
, const u8
*src
)
55 memcpy(dst
, src
, NULL_BLOCK_SIZE
);
58 static struct crypto_alg compress_null
= {
59 .cra_name
= "compress_null",
60 .cra_flags
= CRYPTO_ALG_TYPE_COMPRESS
,
61 .cra_blocksize
= NULL_BLOCK_SIZE
,
63 .cra_module
= THIS_MODULE
,
64 .cra_list
= LIST_HEAD_INIT(compress_null
.cra_list
),
65 .cra_u
= { .compress
= {
66 .coa_compress
= null_compress
,
67 .coa_decompress
= null_compress
} }
70 static struct crypto_alg digest_null
= {
71 .cra_name
= "digest_null",
72 .cra_flags
= CRYPTO_ALG_TYPE_DIGEST
,
73 .cra_blocksize
= NULL_BLOCK_SIZE
,
75 .cra_module
= THIS_MODULE
,
76 .cra_list
= LIST_HEAD_INIT(digest_null
.cra_list
),
77 .cra_u
= { .digest
= {
78 .dia_digestsize
= NULL_DIGEST_SIZE
,
79 .dia_init
= null_init
,
80 .dia_update
= null_update
,
81 .dia_final
= null_final
} }
84 static struct crypto_alg cipher_null
= {
85 .cra_name
= "cipher_null",
86 .cra_flags
= CRYPTO_ALG_TYPE_CIPHER
,
87 .cra_blocksize
= NULL_BLOCK_SIZE
,
89 .cra_module
= THIS_MODULE
,
90 .cra_list
= LIST_HEAD_INIT(cipher_null
.cra_list
),
91 .cra_u
= { .cipher
= {
92 .cia_min_keysize
= NULL_KEY_SIZE
,
93 .cia_max_keysize
= NULL_KEY_SIZE
,
94 .cia_setkey
= null_setkey
,
95 .cia_encrypt
= null_crypt
,
96 .cia_decrypt
= null_crypt
} }
99 MODULE_ALIAS("compress_null");
100 MODULE_ALIAS("digest_null");
101 MODULE_ALIAS("cipher_null");
103 static int __init
init(void)
107 ret
= crypto_register_alg(&cipher_null
);
111 ret
= crypto_register_alg(&digest_null
);
113 crypto_unregister_alg(&cipher_null
);
117 ret
= crypto_register_alg(&compress_null
);
119 crypto_unregister_alg(&digest_null
);
120 crypto_unregister_alg(&cipher_null
);
128 static void __exit
fini(void)
130 crypto_unregister_alg(&compress_null
);
131 crypto_unregister_alg(&digest_null
);
132 crypto_unregister_alg(&cipher_null
);
138 MODULE_LICENSE("GPL");
139 MODULE_DESCRIPTION("Null Cryptographic Algorithms");