forked from Minki/linux
50 lines
1.3 KiB
C
50 lines
1.3 KiB
C
|
/* Signature verification with an asymmetric key
|
||
|
|
*
|
||
|
|
* See Documentation/security/asymmetric-keys.txt
|
||
|
|
*
|
||
|
|
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
|
||
|
|
* Written by David Howells (dhowells@redhat.com)
|
||
|
|
*
|
||
|
|
* This program is free software; you can redistribute it and/or
|
||
|
|
* modify it under the terms of the GNU General Public Licence
|
||
|
|
* as published by the Free Software Foundation; either version
|
||
|
|
* 2 of the Licence, or (at your option) any later version.
|
||
|
|
*/
|
||
|
|
|
||
|
|
#include <keys/asymmetric-subtype.h>
|
||
|
|
#include <linux/module.h>
|
||
|
|
#include <linux/err.h>
|
||
|
|
#include <crypto/public_key.h>
|
||
|
|
#include "asymmetric_keys.h"
|
||
|
|
|
||
|
|
/**
|
||
|
|
* verify_signature - Initiate the use of an asymmetric key to verify a signature
|
||
|
|
* @key: The asymmetric key to verify against
|
||
|
|
* @sig: The signature to check
|
||
|
|
*
|
||
|
|
* Returns 0 if successful or else an error.
|
||
|
|
*/
|
||
|
|
int verify_signature(const struct key *key,
|
||
|
|
const struct public_key_signature *sig)
|
||
|
|
{
|
||
|
|
const struct asymmetric_key_subtype *subtype;
|
||
|
|
int ret;
|
||
|
|
|
||
|
|
pr_devel("==>%s()\n", __func__);
|
||
|
|
|
||
|
|
if (key->type != &key_type_asymmetric)
|
||
|
|
return -EINVAL;
|
||
|
|
subtype = asymmetric_key_subtype(key);
|
||
|
|
if (!subtype ||
|
||
|
|
!key->payload.data)
|
||
|
|
return -EINVAL;
|
||
|
|
if (!subtype->verify_signature)
|
||
|
|
return -ENOTSUPP;
|
||
|
|
|
||
|
|
ret = subtype->verify_signature(key, sig);
|
||
|
|
|
||
|
|
pr_devel("<==%s() = %d\n", __func__, ret);
|
||
|
|
return ret;
|
||
|
|
}
|
||
|
|
EXPORT_SYMBOL_GPL(verify_signature);
|