mirror of https://github.com/openssl/openssl.git
89 lines
3.1 KiB
Plaintext
89 lines
3.1 KiB
Plaintext
=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
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operations. By modifying the method, alternative implementations
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such as hardware accelerators may be used. IMPORTANT: See the NOTES section for
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important information about how these DSA API functions are affected by the use
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of B<ENGINE> API calls.
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Initially, the default DSA_METHOD is the OpenSSL internal implementation,
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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.
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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
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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
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B<rsa>. This will replace the DSA_METHOD used by the DSA key and if the
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previous method was supplied by an ENGINE, the handle to that ENGINE will
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be released during the change. It is possible to have DSA keys that only
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work with certain DSA_METHOD implementations (e.g. from an ENGINE module
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that supports embedded hardware-protected keys), and in such cases
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attempting to change the DSA_METHOD for the key can have unexpected
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results. See L<DSA_meth_new(3)> for information on constructing custom DSA_METHOD
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objects;
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DSA_new_method() allocates and initializes a DSA structure so that B<engine>
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will be used for the DSA operations. If B<engine> is NULL, the default engine
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for DSA operations is used, and if no default ENGINE is set, the DSA_METHOD
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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
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B<DSA_METHOD>s.
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DSA_set_default_method() returns no value.
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DSA_set_method() returns nonzero if the provided B<meth> was successfully set as
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the method for B<dsa> (including unloading the ENGINE handle if the previous
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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 2000-2020 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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