DH_set_default_openssl_method man page on DigitalUNIX

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DH_set_method(3)					      DH_set_method(3)

       DH_set_method,				DH_set_default_openssl_method,
       DH_get_default_openssl_method, DH_new_method, DH_OpenSSL	 -  Select  DH

       #include <openssl/dh.h> #include <openssl/engine.h>

       void DH_set_default_openssl_method(
	       DH_METHOD *meth ); DH_METHOD *DH_get_default_openssl_method(
	       void ); int DH_set_method(
	       DH *dh, ENGINE *engine ); DH *DH_new_method(
	       ENGINE *engine ); DH_METHOD *DH_OpenSSL(
	       void );

       A  DH_METHOD specifies the functions that OpenSSL uses for Diffie-Hell‐
       man operations. By modifying the	 method,  alternative  implementations
       such as hardware accelerators may be used.

       Initially,  the	default is to use the OpenSSL internal implementation.
       The DH_OpenSSL() function returns a pointer to that method.

       The DH_set_default_openssl_method() function  makes  meth  the  default
       method  for  all	 DH structures created later.  This is true only while
       the default engine for Diffie-Hellman operations	 remains  as  openssl.
       Engines	provide	 an  encapsulation  for implementations of one or more
       algorithms, and all the DH functions mentioned here operate within  the
       scope of the default openssl engine.

       The  DH_get_default_openssl_method()  function returns a pointer to the
       current default method for the openssl engine.

       The DH_set_method() function selects engine as the engine that will  be
       responsible for all operations using the structure dh. If this function
       completes successfully, then the dh structure will have its  own	 func‐
       tional reference of engine, so the caller should remember to free their
       own reference to engine when finished with it.  An  engine's  DH_METHOD
       can  be	retrieved  (or	set) by the ENGINE_get_DH() or ENGINE_set_DH()

       The DH_new_method() function allocates and initializes a	 DH  structure
       so  that engine will be used for the DH operations.  If engine is NULL,
       the default engine for Diffie-Hellman operations is used.

   DH_METHOD Structure
	typedef struct dh_meth_st
	    /* name of the implementation */	  const char *name;

	    /* generate private and public DH values for key agreement */
	       int (*generate_key)(DH *dh);

	    /* compute shared secret */
	       int (*compute_key)(unsigned  char  *key,	 BIGNUM	 *pub_key,  DH

	    /*	compute r = a ^ p mod m (May be NULL for some implementations)
	       int (*bn_mod_exp)(DH *dh, BIGNUM *r, BIGNUM  *a,	 const	BIGNUM
				       const BIGNUM *m, BN_CTX *ctx,
				       BN_MONT_CTX *m_ctx);

	    /* called at DH_new */
	       int (*init)(DH *dh);

	    /* called at DH_free */
	       int (*finish)(DH *dh);

	       int flags;

	       char *app_data; /* ?? */


       The  DH_OpenSSL() and DH_get_default_method() functions return pointers
       to the respective DH_METHODs.

       The DH_set_default_openssl_method() function returns no value.

       The DH_set_method() function returns non-zero if the  engin  associated
       with dh was successfully changed to engine.

       The  DH_new_method()  function returns NULL and sets an error code that
       can be obtained by ERR_get_error() if the allocation  fails.  Otherwise
       it returns a pointer to the newly allocated structure.

       The  DH_set_default_method(), DH_get_default_method(), DH_set_method(),
       DH_new_method(), and  DH_OpenSSL()  functions  were  added  in  OpenSSL

       The DH_set_default_openssl_method() and DH_get_default_openssl_method()
       replaced DH_set_default_method()	 and  DH_get_default_method()  respec‐
       tively,	and  DH_set_method()  and  DH_new_method() were altered to use
       ENGINEs rather than DH_METHODs during development of OpenSSL 0.9.6.

       Functions: dh(3), DH_new(3)


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