1// SPDX-License-Identifier: GPL-2.0-only
2/* Copyright (c) 2024 Meta, Inc */
3#include <linux/types.h>
4#include <linux/module.h>
5#include <linux/bpf_crypto.h>
6#include <crypto/skcipher.h>
7
8static void *bpf_crypto_lskcipher_alloc_tfm(const char *algo)
9{
10 return crypto_alloc_lskcipher(alg_name: algo, type: 0, mask: 0);
11}
12
13static void bpf_crypto_lskcipher_free_tfm(void *tfm)
14{
15 crypto_free_lskcipher(tfm);
16}
17
18static int bpf_crypto_lskcipher_has_algo(const char *algo)
19{
20 return crypto_has_skcipher(alg_name: algo, CRYPTO_ALG_TYPE_LSKCIPHER, CRYPTO_ALG_TYPE_MASK);
21}
22
23static int bpf_crypto_lskcipher_setkey(void *tfm, const u8 *key, unsigned int keylen)
24{
25 return crypto_lskcipher_setkey(tfm, key, keylen);
26}
27
28static u32 bpf_crypto_lskcipher_get_flags(void *tfm)
29{
30 return crypto_lskcipher_get_flags(tfm);
31}
32
33static unsigned int bpf_crypto_lskcipher_ivsize(void *tfm)
34{
35 return crypto_lskcipher_ivsize(tfm);
36}
37
38static unsigned int bpf_crypto_lskcipher_statesize(void *tfm)
39{
40 return crypto_lskcipher_statesize(tfm);
41}
42
43static int bpf_crypto_lskcipher_encrypt(void *tfm, const u8 *src, u8 *dst,
44 unsigned int len, u8 *siv)
45{
46 return crypto_lskcipher_encrypt(tfm, src, dst, len, siv);
47}
48
49static int bpf_crypto_lskcipher_decrypt(void *tfm, const u8 *src, u8 *dst,
50 unsigned int len, u8 *siv)
51{
52 return crypto_lskcipher_decrypt(tfm, src, dst, len, siv);
53}
54
55static const struct bpf_crypto_type bpf_crypto_lskcipher_type = {
56 .alloc_tfm = bpf_crypto_lskcipher_alloc_tfm,
57 .free_tfm = bpf_crypto_lskcipher_free_tfm,
58 .has_algo = bpf_crypto_lskcipher_has_algo,
59 .setkey = bpf_crypto_lskcipher_setkey,
60 .encrypt = bpf_crypto_lskcipher_encrypt,
61 .decrypt = bpf_crypto_lskcipher_decrypt,
62 .ivsize = bpf_crypto_lskcipher_ivsize,
63 .statesize = bpf_crypto_lskcipher_statesize,
64 .get_flags = bpf_crypto_lskcipher_get_flags,
65 .owner = THIS_MODULE,
66 .name = "skcipher",
67};
68
69static int __init bpf_crypto_skcipher_init(void)
70{
71 return bpf_crypto_register_type(type: &bpf_crypto_lskcipher_type);
72}
73
74static void __exit bpf_crypto_skcipher_exit(void)
75{
76 int err = bpf_crypto_unregister_type(type: &bpf_crypto_lskcipher_type);
77 WARN_ON_ONCE(err);
78}
79
80module_init(bpf_crypto_skcipher_init);
81module_exit(bpf_crypto_skcipher_exit);
82MODULE_LICENSE("GPL");
83MODULE_DESCRIPTION("Symmetric key cipher support for BPF");
84

source code of linux/crypto/bpf_crypto_skcipher.c