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 <openssl/core.h>
  #include <openssl/dh.h>
  #include "internal/ffc.h"
  
  DH *dh_new_by_nid_ex(OSSL_LIB_CTX *libctx, int nid);
  DH *dh_new_ex(OSSL_LIB_CTX *libctx);
  
  int dh_generate_ffc_parameters(DH *dh, int type, int pbits, int qbits,
                                 BN_GENCB *cb);
  int dh_generate_public_key(BN_CTX *ctx, DH *dh, const BIGNUM *priv_key,
                             BIGNUM *pub_key);
  int dh_get_named_group_uid_from_size(int pbits);
  const char *dh_gen_type_id2name(int id);
  void dh_cache_named_group(DH *dh);
  
  FFC_PARAMS *dh_get0_params(DH *dh);
  int dh_get0_nid(const DH *dh);
  int dh_ffc_params_fromdata(DH *dh, const OSSL_PARAM params[]);
  int dh_key_fromdata(DH *dh, const OSSL_PARAM params[]);
  
  int dh_check_pub_key_partial(const DH *dh, const BIGNUM *pub_key, int *ret);
  int dh_check_priv_key(const DH *dh, const BIGNUM *priv_key, int *ret);
  int dh_check_pairwise(DH *dh);
  
  const DH_METHOD *dh_get_method(const DH *dh);
  
  int dh_buf2key(DH *key, const unsigned char *buf, size_t len);
  size_t dh_key2buf(const DH *dh, unsigned char **pbuf, size_t size, int alloc);
  
  int dh_KDF_X9_42_asn1(unsigned char *out, size_t outlen,
                        const unsigned char *Z, size_t Zlen,
                        const char *cek_alg,
                        const unsigned char *ukm, size_t ukmlen, const EVP_MD *md,
                        OSSL_LIB_CTX *libctx, const char *propq);
  