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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); |
50 |
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