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 | |
17 | static 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 | |
25 | static 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, out: dst, in: src, len: nbytes); |
31 | return 0; |
32 | } |
33 | |
34 | static 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 | |
42 | static 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 | |
57 | static int __init arc4_init(void) |
58 | { |
59 | return crypto_register_lskcipher(alg: &arc4_alg); |
60 | } |
61 | |
62 | static void __exit arc4_exit(void) |
63 | { |
64 | crypto_unregister_lskcipher(alg: &arc4_alg); |
65 | } |
66 | |
67 | subsys_initcall(arc4_init); |
68 | module_exit(arc4_exit); |
69 | |
70 | MODULE_LICENSE("GPL" ); |
71 | MODULE_DESCRIPTION("ARC4 Cipher Algorithm" ); |
72 | MODULE_AUTHOR("Jon Oberheide <jon@oberheide.org>" ); |
73 | MODULE_ALIAS_CRYPTO("ecb(arc4)" ); |
74 | |