2 * Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
4 * Licensed under the Apache License 2.0 (the "License"). You may not use
5 * this file except in compliance with the License. You can obtain a copy
6 * in the file LICENSE in the source distribution or at
7 * https://www.openssl.org/source/license.html
11 * This implemments a dummy key manager for legacy KDFs that still support the
12 * old way of performing a KDF via EVP_PKEY_derive(). New KDFs should not be
13 * implemented this way. In reality there is no key data for such KDFs, so this
14 * key manager does very little.
17 #include <openssl/core_dispatch.h>
18 #include <openssl/core_names.h>
19 #include <openssl/err.h>
20 #include "prov/implementations.h"
21 #include "prov/providercommon.h"
22 #include "prov/provider_ctx.h"
23 #include "prov/kdfexchange.h"
25 static OSSL_FUNC_keymgmt_new_fn kdf_newdata;
26 static OSSL_FUNC_keymgmt_free_fn kdf_freedata;
27 static OSSL_FUNC_keymgmt_has_fn kdf_has;
29 KDF_DATA *kdf_data_new(void *provctx)
33 if (!ossl_prov_is_running())
36 kdfdata = OPENSSL_zalloc(sizeof(*kdfdata));
40 kdfdata->lock = CRYPTO_THREAD_lock_new();
41 if (kdfdata->lock == NULL) {
42 OPENSSL_free(kdfdata);
45 kdfdata->libctx = PROV_LIBCTX_OF(provctx);
51 void kdf_data_free(KDF_DATA *kdfdata)
58 CRYPTO_DOWN_REF(&kdfdata->refcnt, &ref, kdfdata->lock);
62 CRYPTO_THREAD_lock_free(kdfdata->lock);
63 OPENSSL_free(kdfdata);
66 int kdf_data_up_ref(KDF_DATA *kdfdata)
70 /* This is effectively doing a new operation on the KDF_DATA and should be
71 * adequately guarded again modules' error states. However, both current
72 * calls here are guarded propery in exchange/kdf_exch.c. Thus, it
73 * could be removed here. The concern is that something in the future
74 * might call this function without adequate guards. It's a cheap call,
75 * it seems best to leave it even though it is currently redundant.
77 if (!ossl_prov_is_running())
80 CRYPTO_UP_REF(&kdfdata->refcnt, &ref, kdfdata->lock);
84 static void *kdf_newdata(void *provctx)
86 return kdf_data_new(provctx);
89 static void kdf_freedata(void *kdfdata)
91 kdf_data_free(kdfdata);
94 static int kdf_has(void *keydata, int selection)
99 const OSSL_DISPATCH ossl_kdf_keymgmt_functions[] = {
100 { OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))kdf_newdata },
101 { OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))kdf_freedata },
102 { OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))kdf_has },