+int DH_generate_parameters_ex(DH *dh, int prime_len, int generator,
+ BN_GENCB *cb);
+
+int DH_check(const DH *dh, int *codes);
+int DH_check_pub_key(const DH *dh, const BIGNUM *pub_key, int *codes);
+int DH_generate_key(DH *dh);
+int DH_compute_key(unsigned char *key, const BIGNUM *pub_key, DH *dh);
+int DH_compute_key_padded(unsigned char *key, const BIGNUM *pub_key, DH *dh);
+DH *d2i_DHparams(DH **a, const unsigned char **pp, long length);
+int i2d_DHparams(const DH *a, unsigned char **pp);
+DH *d2i_DHxparams(DH **a, const unsigned char **pp, long length);
+int i2d_DHxparams(const DH *a, unsigned char **pp);
+# ifndef OPENSSL_NO_STDIO
+int DHparams_print_fp(FILE *fp, const DH *x);
+# endif
+int DHparams_print(BIO *bp, const DH *x);
+
+/* RFC 5114 parameters */
+DH *DH_get_1024_160(void);
+DH *DH_get_2048_224(void);
+DH *DH_get_2048_256(void);
+
+# ifndef OPENSSL_NO_CMS
+/* RFC2631 KDF */
+int DH_KDF_X9_42(unsigned char *out, size_t outlen,
+ const unsigned char *Z, size_t Zlen,
+ ASN1_OBJECT *key_oid,
+ const unsigned char *ukm, size_t ukmlen, const EVP_MD *md);
+# endif
+
+void DH_get0_pqg(const DH *dh,
+ const BIGNUM **p, const BIGNUM **q, const BIGNUM **g);
+int DH_set0_pqg(DH *dh, BIGNUM *p, BIGNUM *q, BIGNUM *g);
+void DH_get0_key(const DH *dh,
+ const BIGNUM **pub_key, const BIGNUM **priv_key);
+int DH_set0_key(DH *dh, BIGNUM *pub_key, BIGNUM *priv_key);
+void DH_clear_flags(DH *dh, int flags);
+int DH_test_flags(const DH *dh, int flags);
+void DH_set_flags(DH *dh, int flags);
+ENGINE *DH_get0_engine(DH *d);
+long DH_get_length(const DH *dh);
+int DH_set_length(DH *dh, long length);
+
+DH_METHOD *DH_meth_new(const char *name, int flags);
+void DH_meth_free(DH_METHOD *dhm);
+DH_METHOD *DH_meth_dup(const DH_METHOD *dhm);
+const char *DH_meth_get0_name(const DH_METHOD *dhm);
+int DH_meth_set1_name(DH_METHOD *dhm, const char *name);
+int DH_meth_get_flags(DH_METHOD *dhm);
+int DH_meth_set_flags(DH_METHOD *dhm, int flags);
+void *DH_meth_get0_app_data(const DH_METHOD *dhm);
+int DH_meth_set0_app_data(DH_METHOD *dhm, void *app_data);
+int (*DH_meth_get_generate_key(const DH_METHOD *dhm)) (DH *);
+int DH_meth_set_generate_key(DH_METHOD *dhm, int (*generate_key) (DH *));
+int (*DH_meth_get_compute_key(const DH_METHOD *dhm))
+ (unsigned char *key, const BIGNUM *pub_key, DH *dh);
+int DH_meth_set_compute_key(DH_METHOD *dhm,
+ int (*compute_key) (unsigned char *key, const BIGNUM *pub_key, DH *dh));
+int (*DH_meth_get_bn_mod_exp(const DH_METHOD *dhm))
+ (const DH *, BIGNUM *, const BIGNUM *, const BIGNUM *, const BIGNUM *,
+ BN_CTX *, BN_MONT_CTX *);
+int DH_meth_set_bn_mod_exp(DH_METHOD *dhm,
+ int (*bn_mod_exp) (const DH *, BIGNUM *, const BIGNUM *, const BIGNUM *,
+ const BIGNUM *, BN_CTX *, BN_MONT_CTX *));
+int (*DH_meth_get_init(const DH_METHOD *dhm))(DH *);
+int DH_meth_set_init(DH_METHOD *dhm, int (*init)(DH *));
+int (*DH_meth_get_finish(const DH_METHOD *dhm)) (DH *);
+int DH_meth_set_finish(DH_METHOD *dhm, int (*finish) (DH *));
+int (*DH_meth_get_generate_params(const DH_METHOD *dhm))
+ (DH *, int, int, BN_GENCB *);
+int DH_meth_set_generate_params(DH_METHOD *dhm,
+ int (*generate_params) (DH *, int, int, BN_GENCB *));
+
+
+# define EVP_PKEY_CTX_set_dh_paramgen_prime_len(ctx, len) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
+ EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN, len, NULL)
+
+# define EVP_PKEY_CTX_set_dh_paramgen_subprime_len(ctx, len) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
+ EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN, len, NULL)
+
+# define EVP_PKEY_CTX_set_dh_paramgen_type(ctx, typ) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
+ EVP_PKEY_CTRL_DH_PARAMGEN_TYPE, typ, NULL)
+
+# define EVP_PKEY_CTX_set_dh_paramgen_generator(ctx, gen) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DH, EVP_PKEY_OP_PARAMGEN, \
+ EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR, gen, NULL)
+
+# define EVP_PKEY_CTX_set_dh_rfc5114(ctx, gen) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \
+ EVP_PKEY_CTRL_DH_RFC5114, gen, NULL)
+
+# define EVP_PKEY_CTX_set_dhx_rfc5114(ctx, gen) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, EVP_PKEY_OP_PARAMGEN, \
+ EVP_PKEY_CTRL_DH_RFC5114, gen, NULL)
+
+# define EVP_PKEY_CTX_set_dh_kdf_type(ctx, kdf) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
+ EVP_PKEY_OP_DERIVE, \
+ EVP_PKEY_CTRL_DH_KDF_TYPE, kdf, NULL)
+
+# define EVP_PKEY_CTX_get_dh_kdf_type(ctx) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
+ EVP_PKEY_OP_DERIVE, \
+ EVP_PKEY_CTRL_DH_KDF_TYPE, -2, NULL)
+
+# define EVP_PKEY_CTX_set0_dh_kdf_oid(ctx, oid) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
+ EVP_PKEY_OP_DERIVE, \
+ EVP_PKEY_CTRL_DH_KDF_OID, 0, (void *)oid)
+
+# define EVP_PKEY_CTX_get0_dh_kdf_oid(ctx, poid) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
+ EVP_PKEY_OP_DERIVE, \
+ EVP_PKEY_CTRL_GET_DH_KDF_OID, 0, (void *)poid)
+
+# define EVP_PKEY_CTX_set_dh_kdf_md(ctx, md) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
+ EVP_PKEY_OP_DERIVE, \
+ EVP_PKEY_CTRL_DH_KDF_MD, 0, (void *)md)
+
+# define EVP_PKEY_CTX_get_dh_kdf_md(ctx, pmd) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
+ EVP_PKEY_OP_DERIVE, \
+ EVP_PKEY_CTRL_GET_DH_KDF_MD, 0, (void *)pmd)
+
+# define EVP_PKEY_CTX_set_dh_kdf_outlen(ctx, len) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
+ EVP_PKEY_OP_DERIVE, \
+ EVP_PKEY_CTRL_DH_KDF_OUTLEN, len, NULL)
+
+# define EVP_PKEY_CTX_get_dh_kdf_outlen(ctx, plen) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
+ EVP_PKEY_OP_DERIVE, \
+ EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN, 0, (void *)plen)
+
+# define EVP_PKEY_CTX_set0_dh_kdf_ukm(ctx, p, plen) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
+ EVP_PKEY_OP_DERIVE, \
+ EVP_PKEY_CTRL_DH_KDF_UKM, plen, (void *)p)
+
+# define EVP_PKEY_CTX_get0_dh_kdf_ukm(ctx, p) \
+ EVP_PKEY_CTX_ctrl(ctx, EVP_PKEY_DHX, \
+ EVP_PKEY_OP_DERIVE, \
+ EVP_PKEY_CTRL_GET_DH_KDF_UKM, 0, (void *)p)
+
+# define EVP_PKEY_CTRL_DH_PARAMGEN_PRIME_LEN (EVP_PKEY_ALG_CTRL + 1)
+# define EVP_PKEY_CTRL_DH_PARAMGEN_GENERATOR (EVP_PKEY_ALG_CTRL + 2)
+# define EVP_PKEY_CTRL_DH_RFC5114 (EVP_PKEY_ALG_CTRL + 3)
+# define EVP_PKEY_CTRL_DH_PARAMGEN_SUBPRIME_LEN (EVP_PKEY_ALG_CTRL + 4)
+# define EVP_PKEY_CTRL_DH_PARAMGEN_TYPE (EVP_PKEY_ALG_CTRL + 5)
+# define EVP_PKEY_CTRL_DH_KDF_TYPE (EVP_PKEY_ALG_CTRL + 6)
+# define EVP_PKEY_CTRL_DH_KDF_MD (EVP_PKEY_ALG_CTRL + 7)
+# define EVP_PKEY_CTRL_GET_DH_KDF_MD (EVP_PKEY_ALG_CTRL + 8)
+# define EVP_PKEY_CTRL_DH_KDF_OUTLEN (EVP_PKEY_ALG_CTRL + 9)
+# define EVP_PKEY_CTRL_GET_DH_KDF_OUTLEN (EVP_PKEY_ALG_CTRL + 10)
+# define EVP_PKEY_CTRL_DH_KDF_UKM (EVP_PKEY_ALG_CTRL + 11)
+# define EVP_PKEY_CTRL_GET_DH_KDF_UKM (EVP_PKEY_ALG_CTRL + 12)
+# define EVP_PKEY_CTRL_DH_KDF_OID (EVP_PKEY_ALG_CTRL + 13)
+# define EVP_PKEY_CTRL_GET_DH_KDF_OID (EVP_PKEY_ALG_CTRL + 14)
+
+/* KDF types */
+# define EVP_PKEY_DH_KDF_NONE 1
+# ifndef OPENSSL_NO_CMS
+# define EVP_PKEY_DH_KDF_X9_42 2
+# endif