Updated: 2021/Apr/14

DSA_set_method(3)                   OpenSSL                  DSA_set_method(3)

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

       libcrypto, -lcrypto

        #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);

       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

       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 (e.g. 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.

       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 nonzero 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.

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

       Copyright 2000-2020 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

1.1.1i                            2020-12-10                 DSA_set_method(3)