blob: 28198314bc39f4f4a27da38565619f6e262a7fd4 [file] [log] [blame]
/* Signature verification with an asymmetric key
* See Documentation/crypto/asymmetric-keys.txt
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
* Written by David Howells (
* 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.
#define pr_fmt(fmt) "SIG: "fmt
#include <keys/asymmetric-subtype.h>
#include <linux/export.h>
#include <linux/err.h>
#include <linux/slab.h>
#include <crypto/public_key.h>
#include "asymmetric_keys.h"
* Destroy a public key signature.
void public_key_signature_free(struct public_key_signature *sig)
int i;
if (sig) {
for (i = 0; i < ARRAY_SIZE(sig->auth_ids); i++)
* 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 ||
return -EINVAL;
if (!subtype->verify_signature)
return -ENOTSUPP;
ret = subtype->verify_signature(key, sig);
pr_devel("<==%s() = %d\n", __func__, ret);
return ret;