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git.proxmox.com Git - mirror_ubuntu-jammy-kernel.git/blob - crypto/asymmetric_keys/signature.c
1 /* Signature verification with an asymmetric key
3 * See Documentation/security/asymmetric-keys.txt
5 * Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
6 * Written by David Howells (dhowells@redhat.com)
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.
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"
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
25 * Returns 0 if successful or else an error.
27 int verify_signature(const struct key
*key
,
28 const struct public_key_signature
*sig
)
30 const struct asymmetric_key_subtype
*subtype
;
33 pr_devel("==>%s()\n", __func__
);
35 if (key
->type
!= &key_type_asymmetric
)
37 subtype
= asymmetric_key_subtype(key
);
41 if (!subtype
->verify_signature
)
44 ret
= subtype
->verify_signature(key
, sig
);
46 pr_devel("<==%s() = %d\n", __func__
, ret
);
49 EXPORT_SYMBOL_GPL(verify_signature
);