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										 |  |  | =pod | 
					
						
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							|  |  |  | =head1 NAME | 
					
						
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										 |  |  | DSA_set_default_method, DSA_get_default_method, | 
					
						
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										 |  |  | DSA_set_method, DSA_new_method, DSA_OpenSSL - select DSA method | 
					
						
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							|  |  |  | =head1 SYNOPSIS | 
					
						
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										 |  |  |  #include <openssl/dsa.h> | 
					
						
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										 |  |  |  void DSA_set_default_method(const DSA_METHOD *meth); | 
					
						
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										 |  |  |  const DSA_METHOD *DSA_get_default_method(void); | 
					
						
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										 |  |  |  int DSA_set_method(DSA *dsa, const DSA_METHOD *meth); | 
					
						
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										 |  |  |  DSA *DSA_new_method(ENGINE *engine); | 
					
						
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							|  |  |  |  DSA_METHOD *DSA_OpenSSL(void); | 
					
						
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							|  |  |  | =head1 DESCRIPTION | 
					
						
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							|  |  |  | A B<DSA_METHOD> specifies the functions that OpenSSL uses for DSA | 
					
						
							|  |  |  | operations. By modifying the method, alternative implementations | 
					
						
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										 |  |  | 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 B<ENGINE> API calls. | 
					
						
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							|  |  |  | Initially, the default DSA_METHOD is the OpenSSL internal implementation, | 
					
						
							|  |  |  | as returned by DSA_OpenSSL(). | 
					
						
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							|  |  |  | DSA_set_default_method() makes B<meth> the default method for all DSA | 
					
						
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										 |  |  | structures created later. | 
					
						
							|  |  |  | B<NB>: This is true only whilst no ENGINE has | 
					
						
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										 |  |  | been set as a default for DSA, so this function is no longer recommended. | 
					
						
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										 |  |  | This function is not thread-safe and should not be called at the same time | 
					
						
							|  |  |  | as other OpenSSL functions. | 
					
						
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							|  |  |  | DSA_get_default_method() returns a pointer to the current default | 
					
						
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										 |  |  | DSA_METHOD. However, the meaningfulness of this result is dependent on | 
					
						
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										 |  |  | whether the ENGINE API is being used, so this function is no longer | 
					
						
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										 |  |  | recommended. | 
					
						
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							|  |  |  | DSA_set_method() selects B<meth> to perform all operations using the key | 
					
						
							|  |  |  | B<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 | 
					
						
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										 |  |  | results. See L<DSA_meth_new> for information on constructing custom DSA_METHOD | 
					
						
							|  |  |  | objects; | 
					
						
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							|  |  |  | DSA_new_method() allocates and initializes a DSA structure so that B<engine> | 
					
						
							|  |  |  | will be used for the DSA operations. If B<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. | 
					
						
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							|  |  |  | =head1 RETURN VALUES | 
					
						
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										 |  |  | DSA_OpenSSL() and DSA_get_default_method() return pointers to the respective | 
					
						
							|  |  |  | B<DSA_METHOD>s. | 
					
						
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										 |  |  | DSA_set_default_method() returns no value. | 
					
						
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										 |  |  | DSA_set_method() returns non-zero if the provided B<meth> was successfully set as | 
					
						
							|  |  |  | the method for B<dsa> (including unloading the ENGINE handle if the previous | 
					
						
							|  |  |  | method was supplied by an ENGINE). | 
					
						
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										 |  |  | DSA_new_method() returns NULL and sets an error code that can be | 
					
						
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										 |  |  | obtained by L<ERR_get_error(3)> if the allocation | 
					
						
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										 |  |  | fails. Otherwise it returns a pointer to the newly allocated structure. | 
					
						
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							|  |  |  | =head1 SEE ALSO | 
					
						
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										 |  |  | L<DSA_new(3)>, L<DSA_new(3)>, L<DSA_meth_new(3)> | 
					
						
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										 |  |  | =head1 COPYRIGHT | 
					
						
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							|  |  |  | Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved. | 
					
						
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							|  |  |  | 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 | 
					
						
							|  |  |  | L<https://www.openssl.org/source/license.html>. | 
					
						
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							|  |  |  | =cut |