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DSA_SET_METHOD(3)		    OpenSSL		     DSA_SET_METHOD(3)

NAME
       DSA_set_default_method, DSA_get_default_method, DSA_set_method,
       DSA_new_method, DSA_OpenSSL - select DSA	method

SYNOPSIS
	#include <openssl/dsa.h>

	void DSA_set_default_method(const DSA_METHOD *meth);

	const DSA_METHOD *DSA_get_default_method(void);

	int DSA_set_method(DSA *dsa, const DSA_METHOD *meth);

	DSA *DSA_new_method(ENGINE *engine);

	DSA_METHOD *DSA_OpenSSL(void);

DESCRIPTION
       A DSA_METHOD specifies the functions that OpenSSL uses for DSA
       operations. By modifying	the method, alternative	implementations	such
       as hardware accelerators	may be used. IMPORTANT:	See the	NOTES section
       for important information about how these DSA API functions are
       affected	by the use of ENGINE API calls.

       Initially, the default DSA_METHOD is the	OpenSSL	internal
       implementation, as returned by DSA_OpenSSL().

       DSA_set_default_method()	makes meth the default method for all DSA
       structures created later.  NB: This is true only	whilst no ENGINE has
       been set	as a default for DSA, so this function is no longer
       recommended.  This function is not thread-safe and should not be	called
       at the same time	as other OpenSSL functions.

       DSA_get_default_method()	returns	a pointer to the current default
       DSA_METHOD. However, the	meaningfulness of this result is dependent on
       whether the ENGINE API is being used, so	this function is no longer
       recommended.

       DSA_set_method()	selects	meth to	perform	all operations using the key
       rsa. This will replace the DSA_METHOD used by the DSA key and if	the
       previous	method was supplied by an ENGINE, the handle to	that ENGINE
       will be released	during the change. It is possible to have DSA keys
       that only work with certain DSA_METHOD implementations (eg. from	an
       ENGINE module that supports embedded hardware-protected keys), and in
       such cases attempting to	change the DSA_METHOD for the key can have
       unexpected results. See DSA_meth_new for	information on constructing
       custom DSA_METHOD objects;

       DSA_new_method()	allocates and initializes a DSA	structure so that
       engine will be used for the DSA operations. If engine is	NULL, the
       default engine for DSA operations is used, and if no default ENGINE is
       set, the	DSA_METHOD controlled by DSA_set_default_method() is used.

RETURN VALUES
       DSA_OpenSSL() and DSA_get_default_method() return pointers to the
       respective DSA_METHODs.

       DSA_set_default_method()	returns	no value.

       DSA_set_method()	returns	non-zero if the	provided meth was successfully
       set as the method for dsa (including unloading the ENGINE handle	if the
       previous	method was supplied by an ENGINE).

       DSA_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
       DSA_new(3), DSA_new(3), DSA_meth_new(3)

COPYRIGHT
       Copyright 2000-2016 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
       <https://www.openssl.org/source/license.html>.

1.1.1a				  2018-11-20		     DSA_SET_METHOD(3)

NAME | SYNOPSIS | DESCRIPTION | RETURN VALUES | SEE ALSO | COPYRIGHT

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