=head1 NAME
-DSA_set_default_method, DSA_get_default_method, DSA_set_method,
-DSA_new_method, DSA_OpenSSL - select RSA method
+DSA_set_default_method, DSA_get_default_method,
+DSA_set_method, DSA_new_method, DSA_OpenSSL - select DSA method
=head1 SYNOPSIS
- #include <openssl/DSA.h>
+ #include <openssl/dsa.h>
+ #include <openssl/engine.h>
- void DSA_set_default_method(DSA_METHOD *meth);
+ void DSA_set_default_method(const DSA_METHOD *meth);
- DSA_METHOD *DSA_get_default_method(void);
+ const DSA_METHOD *DSA_get_default_method(void);
- DSA_METHOD *DSA_set_method(DSA *dsa, DSA_METHOD *meth);
+ int DSA_set_method(DSA *dsa, const DSA_METHOD *meth);
- DSA *DSA_new_method(DSA_METHOD *meth);
+ DSA *DSA_new_method(ENGINE *engine);
DSA_METHOD *DSA_OpenSSL(void);
A B<DSA_METHOD> specifies the functions that OpenSSL uses for DSA
operations. By modifying the method, alternative implementations
-such as hardware accelerators may be used.
+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.
-Initially, the default is to use the OpenSSL internal implementation.
-DSA_OpenSSL() returns a pointer to that method.
+Initially, the default DSA_METHOD is the OpenSSL internal implementation,
+as returned by DSA_OpenSSL().
-DSA_set_default_method() makes B<meth> the default method for all B<DSA>
-structures created later.
+DSA_set_default_method() makes B<meth> the default method for all DSA
+structures created later. B<NB>: This is true only whilst no ENGINE has
+been set as a default for DSA, so this function is no longer recommended.
DSA_get_default_method() returns a pointer to the current default
-method.
-
-DSA_set_method() selects B<meth> for all operations using the structure B<DSA>.
-
-DSA_get_method() returns a pointer to the method currently selected
-for B<DSA>.
-
-DSA_new_method() allocates and initializes a B<DSA> structure so that
-B<method> will be used for the DSA operations. If B<method> is B<NULL>,
-the default method is used.
+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 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
+results.
+
+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.
=head1 THE DSA_METHOD STRUCTURE
=head1 RETURN VALUES
-DSA_OpenSSL(), DSA_get_default_method() and DSA_get_method() return
-pointers to the respective B<DSA_METHOD>s.
+DSA_OpenSSL() and DSA_get_default_method() return pointers to the respective
+B<DSA_METHOD>s.
DSA_set_default_method() returns no value.
-DSA_set_method() returns a pointer to the B<DSA_METHOD> previously
-associated with B<dsa>.
+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).
-DSA_new_method() returns B<NULL> and sets an error code that can be
-obtained by L<ERR_get_error(3)|ERR_get_error(3)> if the allocation
-fails. Otherwise it returns a pointer to the newly allocated
-structure.
+DSA_new_method() returns NULL and sets an error code that can be
+obtained by L<ERR_get_error(3)> if the allocation
+fails. Otherwise it returns a pointer to the newly allocated structure.
=head1 SEE ALSO
-L<dsa(3)|dsa(3)>, L<DSA_new(3)|DSA_new(3)>
-
-=head1 HISTORY
-
-DSA_set_default_method(), DSA_get_default_method(), DSA_set_method(),
-DSA_new_method() and DSA_OpenSSL() were added in OpenSSL 0.9.4.
+L<dsa(3)>, L<DSA_new(3)>
=cut
projects / openssl.git / blobdiff