1 // SPDX-License-Identifier: GPL-2.0-or-later 1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* 2 /*
3 * Cryptographic API 3 * Cryptographic API
4 * 4 *
5 * ARC4 Cipher Algorithm 5 * ARC4 Cipher Algorithm
6 * 6 *
7 * Jon Oberheide <jon@oberheide.org> 7 * Jon Oberheide <jon@oberheide.org>
8 */ 8 */
9 9
10 #include <crypto/arc4.h> 10 #include <crypto/arc4.h>
11 #include <crypto/internal/skcipher.h> 11 #include <crypto/internal/skcipher.h>
12 #include <linux/init.h> 12 #include <linux/init.h>
13 #include <linux/kernel.h> 13 #include <linux/kernel.h>
14 #include <linux/module.h> 14 #include <linux/module.h>
15 #include <linux/sched.h> 15 #include <linux/sched.h>
16 16
17 #define ARC4_ALIGN __alignof__(struct arc4_ctx 17 #define ARC4_ALIGN __alignof__(struct arc4_ctx)
18 18
19 static int crypto_arc4_setkey(struct crypto_ls 19 static int crypto_arc4_setkey(struct crypto_lskcipher *tfm, const u8 *in_key,
20 unsigned int key 20 unsigned int key_len)
21 { 21 {
22 struct arc4_ctx *ctx = crypto_lskciphe 22 struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm);
23 23
24 return arc4_setkey(ctx, in_key, key_le 24 return arc4_setkey(ctx, in_key, key_len);
25 } 25 }
26 26
27 static int crypto_arc4_crypt(struct crypto_lsk 27 static int crypto_arc4_crypt(struct crypto_lskcipher *tfm, const u8 *src,
28 u8 *dst, unsigned 28 u8 *dst, unsigned nbytes, u8 *siv, u32 flags)
29 { 29 {
30 struct arc4_ctx *ctx = crypto_lskciphe 30 struct arc4_ctx *ctx = crypto_lskcipher_ctx(tfm);
31 31
32 if (!(flags & CRYPTO_LSKCIPHER_FLAG_CO 32 if (!(flags & CRYPTO_LSKCIPHER_FLAG_CONT))
33 memcpy(siv, ctx, sizeof(*ctx)) 33 memcpy(siv, ctx, sizeof(*ctx));
34 34
35 ctx = (struct arc4_ctx *)siv; 35 ctx = (struct arc4_ctx *)siv;
36 36
37 arc4_crypt(ctx, dst, src, nbytes); 37 arc4_crypt(ctx, dst, src, nbytes);
38 return 0; 38 return 0;
39 } 39 }
40 40
41 static int crypto_arc4_init(struct crypto_lskc 41 static int crypto_arc4_init(struct crypto_lskcipher *tfm)
42 { 42 {
43 pr_warn_ratelimited("\"%s\" (%ld) uses 43 pr_warn_ratelimited("\"%s\" (%ld) uses obsolete ecb(arc4) skcipher\n",
44 current->comm, (un 44 current->comm, (unsigned long)current->pid);
45 45
46 return 0; 46 return 0;
47 } 47 }
48 48
49 static struct lskcipher_alg arc4_alg = { 49 static struct lskcipher_alg arc4_alg = {
50 .co.base.cra_name = 50 .co.base.cra_name = "arc4",
51 .co.base.cra_driver_name = 51 .co.base.cra_driver_name = "arc4-generic",
52 .co.base.cra_priority = 52 .co.base.cra_priority = 100,
53 .co.base.cra_blocksize = 53 .co.base.cra_blocksize = ARC4_BLOCK_SIZE,
54 .co.base.cra_ctxsize = 54 .co.base.cra_ctxsize = sizeof(struct arc4_ctx),
55 .co.base.cra_alignmask = 55 .co.base.cra_alignmask = ARC4_ALIGN - 1,
56 .co.base.cra_module = 56 .co.base.cra_module = THIS_MODULE,
57 .co.min_keysize = 57 .co.min_keysize = ARC4_MIN_KEY_SIZE,
58 .co.max_keysize = 58 .co.max_keysize = ARC4_MAX_KEY_SIZE,
59 .co.statesize = 59 .co.statesize = sizeof(struct arc4_ctx),
60 .setkey = 60 .setkey = crypto_arc4_setkey,
61 .encrypt = 61 .encrypt = crypto_arc4_crypt,
62 .decrypt = 62 .decrypt = crypto_arc4_crypt,
63 .init = 63 .init = crypto_arc4_init,
64 }; 64 };
65 65
66 static int __init arc4_init(void) 66 static int __init arc4_init(void)
67 { 67 {
68 return crypto_register_lskcipher(&arc4 68 return crypto_register_lskcipher(&arc4_alg);
69 } 69 }
70 70
71 static void __exit arc4_exit(void) 71 static void __exit arc4_exit(void)
72 { 72 {
73 crypto_unregister_lskcipher(&arc4_alg) 73 crypto_unregister_lskcipher(&arc4_alg);
74 } 74 }
75 75
76 subsys_initcall(arc4_init); 76 subsys_initcall(arc4_init);
77 module_exit(arc4_exit); 77 module_exit(arc4_exit);
78 78
79 MODULE_LICENSE("GPL"); 79 MODULE_LICENSE("GPL");
80 MODULE_DESCRIPTION("ARC4 Cipher Algorithm"); 80 MODULE_DESCRIPTION("ARC4 Cipher Algorithm");
81 MODULE_AUTHOR("Jon Oberheide <jon@oberheide.or 81 MODULE_AUTHOR("Jon Oberheide <jon@oberheide.org>");
82 MODULE_ALIAS_CRYPTO("ecb(arc4)"); 82 MODULE_ALIAS_CRYPTO("ecb(arc4)");
83 83
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