a022ec0269
Add key identifier pointers to public_key_signature struct so that they can be used to retain the identifier of the key to be used to verify the signature in both PKCS#7 and X.509. Signed-off-by: David Howells <dhowells@redhat.com>
68 lines
1.7 KiB
C
68 lines
1.7 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.
|
|
*/
|
|
|
|
#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++)
|
|
kfree(sig->auth_ids[i]);
|
|
kfree(sig->s);
|
|
kfree(sig->digest);
|
|
kfree(sig);
|
|
}
|
|
}
|
|
EXPORT_SYMBOL_GPL(public_key_signature_free);
|
|
|
|
/**
|
|
* 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[0])
|
|
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);
|