text: /*
   * Copyright 2020 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
   */
  
  #include <stdlib.h>
  #include <openssl/crypto.h>
  #include "internal/refcount.h"
  
  struct kdf_data_st {
      OSSL_LIB_CTX *libctx;
      CRYPTO_REF_COUNT refcnt;
      CRYPTO_RWLOCK *lock;
  };
  
  typedef struct kdf_data_st KDF_DATA;
  
  KDF_DATA *ossl_kdf_data_new(void *provctx);
  void ossl_kdf_data_free(KDF_DATA *kdfdata);
  int ossl_kdf_data_up_ref(KDF_DATA *kdfdata);
  