Viewing file:  kdf_legacy_kmgmt.c (2.79 KB) -rw-r--r--
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/*
* Copyright 2019-2022 The OpenSSL Project Authors. All Rights Reserved.
*
* Licensed under the Apache License 2.0 (the "License"). You may not use
* this file except in compliance with the License. You can obtain a copy
* in the file LICENSE in the source distribution or at
* https://www.openssl.org/source/license.html
*/
/*
* This implemments a dummy key manager for legacy KDFs that still support the
* old way of performing a KDF via EVP_PKEY_derive(). New KDFs should not be
* implemented this way. In reality there is no key data for such KDFs, so this
* key manager does very little.
*/
#include <openssl/core_dispatch.h>
#include <openssl/core_names.h>
#include <openssl/err.h>
#include "prov/implementations.h"
#include "prov/providercommon.h"
#include "prov/provider_ctx.h"
#include "prov/kdfexchange.h"
static OSSL_FUNC_keymgmt_new_fn kdf_newdata;
static OSSL_FUNC_keymgmt_free_fn kdf_freedata;
static OSSL_FUNC_keymgmt_has_fn kdf_has;
KDF_DATA *ossl_kdf_data_new(void *provctx)
{
KDF_DATA *kdfdata;
if (!ossl_prov_is_running())
return NULL;
kdfdata = OPENSSL_zalloc(sizeof(*kdfdata));
if (kdfdata == NULL)
return NULL;
kdfdata->lock = CRYPTO_THREAD_lock_new();
if (kdfdata->lock == NULL) {
OPENSSL_free(kdfdata);
return NULL;
}
kdfdata->libctx = PROV_LIBCTX_OF(provctx);
kdfdata->refcnt = 1;
return kdfdata;
}
void ossl_kdf_data_free(KDF_DATA *kdfdata)
{
int ref = 0;
if (kdfdata == NULL)
return;
CRYPTO_DOWN_REF(&kdfdata->refcnt, &ref, kdfdata->lock);
if (ref > 0)
return;
CRYPTO_THREAD_lock_free(kdfdata->lock);
OPENSSL_free(kdfdata);
}
int ossl_kdf_data_up_ref(KDF_DATA *kdfdata)
{
int ref = 0;
/* This is effectively doing a new operation on the KDF_DATA and should be
* adequately guarded again modules' error states. However, both current
* calls here are guarded properly in exchange/kdf_exch.c. Thus, it
* could be removed here. The concern is that something in the future
* might call this function without adequate guards. It's a cheap call,
* it seems best to leave it even though it is currently redundant.
*/
if (!ossl_prov_is_running())
return 0;
CRYPTO_UP_REF(&kdfdata->refcnt, &ref, kdfdata->lock);
return 1;
}
static void *kdf_newdata(void *provctx)
{
return ossl_kdf_data_new(provctx);
}
static void kdf_freedata(void *kdfdata)
{
ossl_kdf_data_free(kdfdata);
}
static int kdf_has(const void *keydata, int selection)
{
return 1; /* nothing is missing */
}
const OSSL_DISPATCH ossl_kdf_keymgmt_functions[] = {
{ OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))kdf_newdata },
{ OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))kdf_freedata },
{ OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))kdf_has },
{ 0, NULL }
};
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