4 * ARC4 Cipher Algorithm
6 * Jon Oberheide <jon@oberheide.org>
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License as published by
10 * the Free Software Foundation; either version 2 of the License, or
11 * (at your option) any later version.
14 #include <linux/module.h>
15 #include <linux/init.h>
16 #include <linux/crypto.h>
18 #define ARC4_MIN_KEY_SIZE 1
19 #define ARC4_MAX_KEY_SIZE 256
20 #define ARC4_BLOCK_SIZE 1
27 static int arc4_set_key(struct crypto_tfm
*tfm
, const u8
*in_key
,
30 struct arc4_ctx
*ctx
= crypto_tfm_ctx(tfm
);
36 for(i
= 0; i
< 256; i
++)
39 for(i
= 0; i
< 256; i
++)
42 j
= (j
+ in_key
[k
] + a
) & 0xff;
43 ctx
->S
[i
] = ctx
->S
[j
];
52 static void arc4_crypt(struct crypto_tfm
*tfm
, u8
*out
, const u8
*in
)
54 struct arc4_ctx
*ctx
= crypto_tfm_ctx(tfm
);
67 *out
++ = *in
^ S
[(a
+ b
) & 0xff];
73 static struct crypto_alg arc4_alg
= {
75 .cra_flags
= CRYPTO_ALG_TYPE_CIPHER
,
76 .cra_blocksize
= ARC4_BLOCK_SIZE
,
77 .cra_ctxsize
= sizeof(struct arc4_ctx
),
78 .cra_module
= THIS_MODULE
,
79 .cra_list
= LIST_HEAD_INIT(arc4_alg
.cra_list
),
80 .cra_u
= { .cipher
= {
81 .cia_min_keysize
= ARC4_MIN_KEY_SIZE
,
82 .cia_max_keysize
= ARC4_MAX_KEY_SIZE
,
83 .cia_setkey
= arc4_set_key
,
84 .cia_encrypt
= arc4_crypt
,
85 .cia_decrypt
= arc4_crypt
} }
88 static int __init
arc4_init(void)
90 return crypto_register_alg(&arc4_alg
);
94 static void __exit
arc4_exit(void)
96 crypto_unregister_alg(&arc4_alg
);
99 module_init(arc4_init
);
100 module_exit(arc4_exit
);
102 MODULE_LICENSE("GPL");
103 MODULE_DESCRIPTION("ARC4 Cipher Algorithm");
104 MODULE_AUTHOR("Jon Oberheide <jon@oberheide.org>");
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