DH_set_method man page on Ultrix

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DH_set_method(3)		    OpenSSL		      DH_set_method(3)

NAME
       DH_set_default_method, DH_get_default_method, DH_set_method,
       DH_new_method, DH_OpenSSL - select DH method

SYNOPSIS
	#include <openssl/dh.h>

	void DH_set_default_method(DH_METHOD *meth);

	DH_METHOD *DH_get_default_method(void);

	DH_METHOD *DH_set_method(DH *dh, DH_METHOD *meth);

	DH *DH_new_method(DH_METHOD *meth);

	DH_METHOD *DH_OpenSSL(void);

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

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

       DH_set_default_method() makes meth the default method for all DH
       structures created later.

       DH_get_default_method() returns a pointer to the current default
       method.

       DH_set_method() selects meth for all operations using the structure dh.

       DH_new_method() allocates and initializes a DH structure so that method
       will be used for the DH operations. If method is NULL, the default
       method is used.

THE 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 *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 *p,
				       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; /* ?? */

	} DH_METHOD;

RETURN VALUES
       DH_OpenSSL() and DH_get_default_method() return pointers to the
       respective DH_METHODs.

       DH_set_default_method() returns no value.

       DH_set_method() returns a pointer to the DH_METHOD previously
       associated with dh.

       DH_new_method() returns NULL and sets an error code that can be
       obtained by ERR_get_error(3) if the allocation fails. Otherwise it
       returns a pointer to the newly allocated structure.

SEE ALSO
       dh(3), DH_new(3)

HISTORY
       DH_set_default_method(), DH_get_default_method(), DH_set_method(),
       DH_new_method() and DH_OpenSSL() were added in OpenSSL 0.9.4.

3rd Berkeley Distribution	    0.9.6m		      DH_set_method(3)
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