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 */
27int 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}
49EXPORT_SYMBOL_GPL(verify_signature);

 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#define pr_fmt(fmt) "SIG: "fmt
15#include <keys/asymmetric-subtype.h>
16#include <linux/export.h>
17#include <linux/err.h>
18#include <crypto/public_key.h>
19#include "asymmetric_keys.h"
20
21/**
22 * verify_signature - Initiate the use of an asymmetric key to verify a signature
23 * @key: The asymmetric key to verify against
24 * @sig: The signature to check
25 *
26 * Returns 0 if successful or else an error.
27 */
28int verify_signature(const struct key *key,
29		     const struct public_key_signature *sig)
30{
31	const struct asymmetric_key_subtype *subtype;
32	int ret;
33
34	pr_devel("==>%s()\n", __func__);
35
36	if (key->type != &key_type_asymmetric)
37		return -EINVAL;
38	subtype = asymmetric_key_subtype(key);
39	if (!subtype ||
40	    !key->payload.data[0])
41		return -EINVAL;
42	if (!subtype->verify_signature)
43		return -ENOTSUPP;
44
45	ret = subtype->verify_signature(key, sig);
46
47	pr_devel("<==%s() = %d\n", __func__, ret);
48	return ret;
49}
50EXPORT_SYMBOL_GPL(verify_signature);