tjh.dev
Linux kernel mirror (for testing)
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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Cryptographic API
4 *
5 * ARC4 Cipher Algorithm
6 *
7 * Jon Oberheide <jon@oberheide.org>
8 */
9
10#include <crypto/arc4.h>
11#include <crypto/internal/skcipher.h>
12#include <linux/init.h>
13#include <linux/kernel.h>
14#include <linux/module.h>
15#include <linux/sched.h>
16
17static int crypto_arc4_setkey(struct crypto_lskcipher *tfm, const u8 *in_key,
18 unsigned int key_len)
19{
20 struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm);
21
22 return arc4_setkey(ctx, in_key, key_len);
23}
24
25static int crypto_arc4_crypt(struct crypto_lskcipher *tfm, const u8 *src,
26 u8 *dst, unsigned nbytes, u8 *iv, bool final)
27{
28 struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm);
29
30 arc4_crypt(ctx, dst, src, nbytes);
31 return 0;
32}
33
34static int crypto_arc4_init(struct crypto_lskcipher *tfm)
35{
36 pr_warn_ratelimited("\"%s\" (%ld) uses obsolete ecb(arc4) skcipher\n",
37 current->comm, (unsigned long)current->pid);
38
39 return 0;
40}
41
42static struct lskcipher_alg arc4_alg = {
43 .co.base.cra_name = "arc4",
44 .co.base.cra_driver_name = "arc4-generic",
45 .co.base.cra_priority = 100,
46 .co.base.cra_blocksize = ARC4_BLOCK_SIZE,
47 .co.base.cra_ctxsize = sizeof(struct arc4_ctx),
48 .co.base.cra_module = THIS_MODULE,
49 .co.min_keysize = ARC4_MIN_KEY_SIZE,
50 .co.max_keysize = ARC4_MAX_KEY_SIZE,
51 .setkey = crypto_arc4_setkey,
52 .encrypt = crypto_arc4_crypt,
53 .decrypt = crypto_arc4_crypt,
54 .init = crypto_arc4_init,
55};
56
57static int __init arc4_init(void)
58{
59 return crypto_register_lskcipher(&arc4_alg);
60}
61
62static void __exit arc4_exit(void)
63{
64 crypto_unregister_lskcipher(&arc4_alg);
65}
66
67subsys_initcall(arc4_init);
68module_exit(arc4_exit);
69
70MODULE_LICENSE("GPL");
71MODULE_DESCRIPTION("ARC4 Cipher Algorithm");
72MODULE_AUTHOR("Jon Oberheide <jon@oberheide.org>");
73MODULE_ALIAS_CRYPTO("ecb(arc4)");