1/* SPDX-License-Identifier: GPL-2.0-only */
2/*
3 * Copyright (C) 2019 Microsoft Corporation.
4 *
5 * Author:  Jaskaran Singh Khurana <jaskarankhurana@linux.microsoft.com>
6 *
7 */
8#ifndef DM_VERITY_SIG_VERIFICATION_H
9#define DM_VERITY_SIG_VERIFICATION_H
10
11#define DM_VERITY_ROOT_HASH_VERIFICATION "DM Verity Sig Verification"
12#define DM_VERITY_ROOT_HASH_VERIFICATION_OPT_SIG_KEY "root_hash_sig_key_desc"
13
14struct dm_verity_sig_opts {
15	unsigned int sig_size;
16	u8 *sig;
17};
18
19#ifdef CONFIG_DM_VERITY_VERIFY_ROOTHASH_SIG
20
21#define DM_VERITY_ROOT_HASH_VERIFICATION_OPTS 2
22
23int verity_verify_root_hash(const void *data, size_t data_len,
24			    const void *sig_data, size_t sig_len);
25bool verity_verify_is_sig_opt_arg(const char *arg_name);
26
27int verity_verify_sig_parse_opt_args(struct dm_arg_set *as, struct dm_verity *v,
28				    struct dm_verity_sig_opts *sig_opts,
29				    unsigned int *argc, const char *arg_name);
30
31void verity_verify_sig_opts_cleanup(struct dm_verity_sig_opts *sig_opts);
32
33#else
34
35#define DM_VERITY_ROOT_HASH_VERIFICATION_OPTS 0
36
37static inline int verity_verify_root_hash(const void *data, size_t data_len,
38					  const void *sig_data, size_t sig_len)
39{
40	return 0;
41}
42
43static inline bool verity_verify_is_sig_opt_arg(const char *arg_name)
44{
45	return false;
46}
47
48static inline int verity_verify_sig_parse_opt_args(struct dm_arg_set *as,
49			struct dm_verity *v, struct dm_verity_sig_opts *sig_opts,
50			unsigned int *argc, const char *arg_name)
51{
52	return -EINVAL;
53}
54
55static inline void verity_verify_sig_opts_cleanup(struct dm_verity_sig_opts *sig_opts)
56{
57}
58
59#endif /* CONFIG_DM_VERITY_VERIFY_ROOTHASH_SIG */
60#endif /* DM_VERITY_SIG_VERIFICATION_H */
61