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-.\"     $OpenBSD: dh.3,v 1.4 2016/12/10 21:13:25 schwarze Exp $
-.\"
-.Dd $Mdocdate: December 10 2016 $
-.Dt DH 3
-.Os
-.Sh NAME
-.Nm dh
-.Nd Diffie-Hellman key agreement
-.Sh SYNOPSIS
-.In openssl/dh.h
-.Sh DESCRIPTION
-These functions implement the Diffie-Hellman key agreement protocol.
-The generation of shared DH parameters is described in
-.Xr DH_generate_parameters 3 ;
-.Xr DH_generate_key 3
-describes how to perform a key agreement.
-.Pp
-The
-.Vt DH
-structure consists of several
-.Vt BIGNUM
-components.
-.Bd -literal
-typedef struct {
-        BIGNUM *p;              // prime number (shared)
-        BIGNUM *g;              // generator of Z_p (shared)
-        BIGNUM *priv_key;       // private DH value x
-        BIGNUM *pub_key;        // public DH value g^x
-        // ...
-} DH;
-.Ed
-.Pp
-Note that DH keys may use non-standard
-.Vt DH_METHOD
-implementations, either directly or by the use of
-.Vt ENGINE
-modules.
-In some cases (e.g. an
-.Vt ENGINE
-providing support for hardware-embedded keys), these
-.Vt BIGNUM
-values will not be used by the implementation or may be used for
-alternative data storage.
-For this reason, applications should generally avoid using
-.Vt DH
-structure elements directly and instead use API functions to query
-or modify keys.
-.Sh SEE ALSO
-.Xr BN_new 3 ,
-.Xr d2i_DHparams 3 ,
-.Xr DH_generate_key 3 ,
-.Xr DH_generate_parameters 3 ,
-.Xr DH_get_ex_new_index 3 ,
-.Xr DH_new 3 ,
-.Xr DH_set_method 3 ,
-.Xr DH_size 3 ,
-.Xr DHparams_print 3 ,
-.Xr dsa 3 ,
-.Xr DSA_dup_DH 3 ,
-.Xr engine 3 ,
-.Xr ERR 3 ,
-.Xr rsa 3