mirror of
https://github.com/smaeul/u-boot.git
synced 2025-10-31 12:08:19 +00:00
fa1289c5d0
Move x509_check_for_self_signed as a common helper function that can be shared by legacy crypto lib and MbedTLS implementation. Signed-off-by: Raymond Mao <raymond.mao@linaro.org> Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
// SPDX-License-Identifier: GPL-2.0+
|
|
/*
|
|
* X509 helper functions
|
|
*
|
|
* Copyright (C) 2012 Red Hat, Inc. All Rights Reserved.
|
|
* Written by David Howells (dhowells@redhat.com)
|
|
*/
|
|
#include <linux/err.h>
|
|
#include <crypto/public_key.h>
|
|
#include <crypto/x509_parser.h>
|
|
|
|
/*
|
|
* Check for self-signedness in an X.509 cert and if found, check the signature
|
|
* immediately if we can.
|
|
*/
|
|
int x509_check_for_self_signed(struct x509_certificate *cert)
|
|
{
|
|
int ret = 0;
|
|
|
|
if (cert->raw_subject_size != cert->raw_issuer_size ||
|
|
memcmp(cert->raw_subject, cert->raw_issuer,
|
|
cert->raw_issuer_size))
|
|
goto not_self_signed;
|
|
|
|
if (cert->sig->auth_ids[0] || cert->sig->auth_ids[1]) {
|
|
/*
|
|
* If the AKID is present it may have one or two parts. If
|
|
* both are supplied, both must match.
|
|
*/
|
|
bool a = asymmetric_key_id_same(cert->skid,
|
|
cert->sig->auth_ids[1]);
|
|
bool b = asymmetric_key_id_same(cert->id,
|
|
cert->sig->auth_ids[0]);
|
|
|
|
if (!a && !b)
|
|
goto not_self_signed;
|
|
|
|
ret = -EKEYREJECTED;
|
|
if (((a && !b) || (b && !a)) &&
|
|
cert->sig->auth_ids[0] && cert->sig->auth_ids[1])
|
|
goto out;
|
|
}
|
|
|
|
ret = -EKEYREJECTED;
|
|
if (strcmp(cert->pub->pkey_algo, cert->sig->pkey_algo))
|
|
goto out;
|
|
|
|
ret = public_key_verify_signature(cert->pub, cert->sig);
|
|
if (ret == -ENOPKG) {
|
|
cert->unsupported_sig = true;
|
|
goto not_self_signed;
|
|
}
|
|
if (ret < 0)
|
|
goto out;
|
|
|
|
pr_devel("Cert Self-signature verified");
|
|
cert->self_signed = true;
|
|
|
|
out:
|
|
return ret;
|
|
|
|
not_self_signed:
|
|
return 0;
|
|
}
|