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ac2d58c72b
Some KDF implementations were available before the current EVP_KDF API. They were used via EVP_PKEY_derive. There exists a bridge between the old API and the EVP_KDF API however this bridge itself uses a legacy EVP_PKEY_METHOD. This commit implements a provider side bridge without having to use any legacy code. Reviewed-by: Paul Dale <paul.dale@oracle.com> (Merged from https://github.com/openssl/openssl/pull/12573)
91 lines
2.2 KiB
C
91 lines
2.2 KiB
C
/*
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* Copyright 2019-2020 The OpenSSL Project Authors. All Rights Reserved.
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*
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* Licensed under the Apache License 2.0 (the "License"). You may not use
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* this file except in compliance with the License. You can obtain a copy
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* in the file LICENSE in the source distribution or at
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* https://www.openssl.org/source/license.html
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*/
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/*
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* This implemments a dummy key manager for legacy KDFs that still support the
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* old way of performing a KDF via EVP_PKEY_derive(). New KDFs should not be
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* implemented this way. In reality there is no key data for such KDFs, so this
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* key manager does very little.
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*/
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#include <openssl/core_dispatch.h>
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#include <openssl/core_names.h>
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#include <openssl/err.h>
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#include "prov/implementations.h"
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#include "prov/providercommon.h"
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#include "prov/provider_ctx.h"
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#include "prov/kdfexchange.h"
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static OSSL_FUNC_keymgmt_new_fn kdf_newdata;
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static OSSL_FUNC_keymgmt_free_fn kdf_freedata;
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static OSSL_FUNC_keymgmt_has_fn kdf_has;
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KDF_DATA *kdf_data_new(void *provctx)
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{
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KDF_DATA *kdfdata = OPENSSL_zalloc(sizeof(*kdfdata));
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if (kdfdata == NULL)
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return NULL;
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kdfdata->lock = CRYPTO_THREAD_lock_new();
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if (kdfdata->lock == NULL) {
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OPENSSL_free(kdfdata);
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return NULL;
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}
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kdfdata->libctx = PROV_LIBRARY_CONTEXT_OF(provctx);
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kdfdata->refcnt = 1;
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return kdfdata;
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}
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void kdf_data_free(KDF_DATA *kdfdata)
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{
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int ref = 0;
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if (kdfdata == NULL)
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return;
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CRYPTO_DOWN_REF(&kdfdata->refcnt, &ref, kdfdata->lock);
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if (ref > 0)
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return;
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CRYPTO_THREAD_lock_free(kdfdata->lock);
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OPENSSL_free(kdfdata);
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}
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int kdf_data_up_ref(KDF_DATA *kdfdata)
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{
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int ref = 0;
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CRYPTO_UP_REF(&kdfdata->refcnt, &ref, kdfdata->lock);
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return 1;
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}
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static void *kdf_newdata(void *provctx)
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{
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return kdf_data_new(provctx);
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}
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static void kdf_freedata(void *kdfdata)
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{
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kdf_data_free(kdfdata);
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}
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static int kdf_has(void *keydata, int selection)
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{
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return 0;
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}
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const OSSL_DISPATCH kdf_keymgmt_functions[] = {
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{ OSSL_FUNC_KEYMGMT_NEW, (void (*)(void))kdf_newdata },
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{ OSSL_FUNC_KEYMGMT_FREE, (void (*)(void))kdf_freedata },
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{ OSSL_FUNC_KEYMGMT_HAS, (void (*)(void))kdf_has },
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{ 0, NULL }
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};
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