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+=head1 NAME
+DH_meth_new, DH_meth_free, DH_meth_dup, DH_meth_get0_name, DH_meth_set1_name,
+DH_meth_get_flags, DH_meth_set_flags, DH_meth_get0_app_data,
+DH_meth_set0_app_data, DH_meth_get_generate_key, DH_meth_set_generate_key,
+DH_meth_get_compute_key, DH_meth_set_compute_key, DH_meth_get_bn_mod_exp,
+DH_meth_set_bn_mod_exp, DH_meth_get_init, DH_meth_set_init, DH_meth_get_finish,
+DH_meth_set_finish, DH_meth_get_generate_params,
+DH_meth_set_generate_params - Routines to build up DH methods
+=head1 SYNOPSIS
+ #include <openssl/dh.h>
+ 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(const 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 *dh, BIGNUM *r, const BIGNUM *a, const BIGNUM *p,
+ const BIGNUM *m, BN_CTX *ctx, BN_MONT_CTX *m_ctx);
+ int DH_meth_set_bn_mod_exp(DH_METHOD *dhm,
+ int (*bn_mod_exp)(const DH *dh, BIGNUM *r, const BIGNUM *a,
+ const BIGNUM *p, const BIGNUM *m, BN_CTX *ctx,
+ BN_MONT_CTX *m_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 *));
+The B<DH_METHOD> type is a structure used for the provision of custom DH
+implementations. It provides a set of functions used by OpenSSL for the
+implementation of the various DH capabilities.
+DH_meth_new() creates a new B<DH_METHOD> structure. It should be given a
+unique B<name> and a set of B<flags>. The B<name> should be a NULL terminated
+string, which will be duplicated and stored in the B<DH_METHOD> object. It is
+the callers responsibility to free the original string. The flags will be used
+during the construction of a new B<DH> object based on this B<DH_METHOD>. Any
+new B<DH> object will have those flags set by default.
+DH_meth_dup() creates a duplicate copy of the B<DH_METHOD> object passed as a
+parameter. This might be useful for creating a new B<DH_METHOD> based on an
+existing one, but with some differences.
+DH_meth_free() destroys a B<DH_METHOD> structure and frees up any memory
+associated with it.
+DH_meth_get0_name() will return a pointer to the name of this DH_METHOD. This
+is a pointer to the internal name string and so should not be freed by the
+caller. DH_meth_set1_name() sets the name of the DH_METHOD to B<name>. The
+string is duplicated and the copy is stored in the DH_METHOD structure, so the
+caller remains responsible for freeing the memory associated with the name.
+DH_meth_get_flags() returns the current value of the flags associated with this
+DH_METHOD. DH_meth_set_flags() provides the ability to set these flags.
+The functions DH_meth_get0_app_data() and DH_meth_set0_app_data() provide the
+ability to associate implementation specific data with the DH_METHOD. It is
+the application's responsibility to free this data before the DH_METHOD is
+freed via a call to DH_meth_free().
+DH_meth_get_generate_key() and DH_meth_set_generate_key() get and set the
+function used for generating a new DH key pair respectively. This function will
+be called in response to the application calling DH_generate_key(). The
+parameter for the function has the same meaning as for DH_generate_key().
+DH_meth_get_compute_key() and DH_meth_set_compute_key() get and set the
+function used for computing a new DH shared secret respectively. This function
+will be called in response to the application calling DH_compute_key(). The
+parameters for the function have the same meaning as for DH_compute_key().
+DH_meth_get_bn_mod_exp() and DH_meth_set_bn_mod_exp() get and set the function
+used for computing the following value:
+ r = a ^ p mod m
+This function will be called by the default OpenSSL function for
+DH_generate_key(). The result is stored in the B<r> parameter. This function
+may be NULL unless using the default generate key function, in which case it
+must be present.
+DH_meth_get_init() and DH_meth_set_init() get and set the function used
+for creating a new DH instance respectively. This function will be
+called in response to the application calling DH_new() (if the current default
+DH_METHOD is this one) or DH_new_method(). The DH_new() and DH_new_method()
+functions will allocate the memory for the new DH object, and a pointer to this
+newly allocated structure will be passed as a parameter to the function. This
+function may be NULL.
+DH_meth_get_finish() and DH_meth_set_finish() get and set the function used
+for destroying an instance of a DH object respectively. This function will be
+called in response to the application calling DH_free(). A pointer to the DH
+to be destroyed is passed as a parameter. The destroy function should be used
+for DH implementation specific clean up. The memory for the DH itself should
+not be freed by this function. This function may be NULL.
+DH_meth_get_generate_params() and DH_meth_set_generate_params() get and set the
+function used for generating DH parameters respectively. This function will be
+called in response to the application calling DH_generate_parameters_ex() (or
+DH_generate_parameters()). The parameters for the function have the same
+meaning as for DH_generate_parameters_ex(). This function may be NULL.
+DH_meth_new() and DH_meth_dup() return the newly allocated DH_METHOD object
+or NULL on failure.
+DH_meth_get0_name() and DH_meth_get_flags() return the name and flags
+associated with the DH_METHOD respectively.
+All other DH_meth_get_*() functions return the appropriate function pointer
+that has been set in the DH_METHOD, or NULL if no such pointer has yet been
+DH_meth_set1_name() and all DH_meth_set_*() functions return 1 on success or
+0 on failure.
+=head1 SEE ALSO
+L<DH_new(3)>, L<DH_new(3)>, L<DH_generate_parameters(3)>, L<DH_generate_key(3)>,
+L<DH_set_method(3)>, L<DH_size(3)>, L<DH_get0_pqg(3)>
+=head1 HISTORY
+The functions described here were added in OpenSSL 1.1.0.
+Copyright 2016-2018 The OpenSSL Project Authors. All Rights Reserved.
+Licensed under the OpenSSL license (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