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4ae71c1d DH |
1 | /* Signature verification with an asymmetric key |
2 | * | |
3 | * See Documentation/security/asymmetric-keys.txt | |
4 | * | |
5 | * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved. | |
6 | * Written by David Howells (dhowells@redhat.com) | |
7 | * | |
8 | * This program is free software; you can redistribute it and/or | |
9 | * modify it under the terms of the GNU General Public Licence | |
10 | * as published by the Free Software Foundation; either version | |
11 | * 2 of the Licence, or (at your option) any later version. | |
12 | */ | |
13 | ||
14 | #include <keys/asymmetric-subtype.h> | |
15 | #include <linux/module.h> | |
16 | #include <linux/err.h> | |
17 | #include <crypto/public_key.h> | |
18 | #include "asymmetric_keys.h" | |
19 | ||
20 | /** | |
21 | * verify_signature - Initiate the use of an asymmetric key to verify a signature | |
22 | * @key: The asymmetric key to verify against | |
23 | * @sig: The signature to check | |
24 | * | |
25 | * Returns 0 if successful or else an error. | |
26 | */ | |
27 | int verify_signature(const struct key *key, | |
28 | const struct public_key_signature *sig) | |
29 | { | |
30 | const struct asymmetric_key_subtype *subtype; | |
31 | int ret; | |
32 | ||
33 | pr_devel("==>%s()\n", __func__); | |
34 | ||
35 | if (key->type != &key_type_asymmetric) | |
36 | return -EINVAL; | |
37 | subtype = asymmetric_key_subtype(key); | |
38 | if (!subtype || | |
39 | !key->payload.data) | |
40 | return -EINVAL; | |
41 | if (!subtype->verify_signature) | |
42 | return -ENOTSUPP; | |
43 | ||
44 | ret = subtype->verify_signature(key, sig); | |
45 | ||
46 | pr_devel("<==%s() = %d\n", __func__, ret); | |
47 | return ret; | |
48 | } | |
49 | EXPORT_SYMBOL_GPL(verify_signature); |