1DSA_SET_METHOD(3)                   OpenSSL                  DSA_SET_METHOD(3)
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NAME

6       DSA_set_default_method, DSA_get_default_method, DSA_set_method,
7       DSA_new_method, DSA_OpenSSL - select DSA method
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SYNOPSIS

10        #include <openssl/dsa.h>
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12        void DSA_set_default_method(const DSA_METHOD *meth);
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14        const DSA_METHOD *DSA_get_default_method(void);
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16        int DSA_set_method(DSA *dsa, const DSA_METHOD *meth);
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18        DSA *DSA_new_method(ENGINE *engine);
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20        DSA_METHOD *DSA_OpenSSL(void);
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DESCRIPTION

23       A DSA_METHOD specifies the functions that OpenSSL uses for DSA
24       operations. By modifying the method, alternative implementations such
25       as hardware accelerators may be used. IMPORTANT: See the NOTES section
26       for important information about how these DSA API functions are
27       affected by the use of ENGINE API calls.
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29       Initially, the default DSA_METHOD is the OpenSSL internal
30       implementation, as returned by DSA_OpenSSL().
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32       DSA_set_default_method() makes meth the default method for all DSA
33       structures created later.  NB: This is true only whilst no ENGINE has
34       been set as a default for DSA, so this function is no longer
35       recommended.  This function is not thread-safe and should not be called
36       at the same time as other OpenSSL functions.
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38       DSA_get_default_method() returns a pointer to the current default
39       DSA_METHOD. However, the meaningfulness of this result is dependent on
40       whether the ENGINE API is being used, so this function is no longer
41       recommended.
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43       DSA_set_method() selects meth to perform all operations using the key
44       rsa. This will replace the DSA_METHOD used by the DSA key and if the
45       previous method was supplied by an ENGINE, the handle to that ENGINE
46       will be released during the change. It is possible to have DSA keys
47       that only work with certain DSA_METHOD implementations (eg. from an
48       ENGINE module that supports embedded hardware-protected keys), and in
49       such cases attempting to change the DSA_METHOD for the key can have
50       unexpected results. See DSA_meth_new for information on constructing
51       custom DSA_METHOD objects;
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53       DSA_new_method() allocates and initializes a DSA structure so that
54       engine will be used for the DSA operations. If engine is NULL, the
55       default engine for DSA operations is used, and if no default ENGINE is
56       set, the DSA_METHOD controlled by DSA_set_default_method() is used.
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RETURN VALUES

59       DSA_OpenSSL() and DSA_get_default_method() return pointers to the
60       respective DSA_METHODs.
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62       DSA_set_default_method() returns no value.
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64       DSA_set_method() returns non-zero if the provided meth was successfully
65       set as the method for dsa (including unloading the ENGINE handle if the
66       previous method was supplied by an ENGINE).
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68       DSA_new_method() returns NULL and sets an error code that can be
69       obtained by ERR_get_error(3) if the allocation fails. Otherwise it
70       returns a pointer to the newly allocated structure.
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SEE ALSO

73       DSA_new(3), DSA_new(3), DSA_meth_new(3)
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76       Copyright 2000-2016 The OpenSSL Project Authors. All Rights Reserved.
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78       Licensed under the OpenSSL license (the "License").  You may not use
79       this file except in compliance with the License.  You can obtain a copy
80       in the file LICENSE in the source distribution or at
81       <https://www.openssl.org/source/license.html>.
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851.1.1                             2018-09-11                 DSA_SET_METHOD(3)
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