.\" $OpenBSD: DSA_meth_new.3,v 1.3 2022/07/10 13:41:59 schwarze Exp $ .\" selective merge up to: OpenSSL c4d3c19b Apr 3 13:57:12 2018 +0100 .\" .\" This file is a derived work. .\" The changes are covered by the following Copyright and license: .\" .\" Copyright (c) 2018, 2022 Ingo Schwarze .\" .\" Permission to use, copy, modify, and distribute this software for any .\" purpose with or without fee is hereby granted, provided that the above .\" copyright notice and this permission notice appear in all copies. .\" .\" THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES .\" WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF .\" MERCHANTABILITY AND FITNESS. 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IN NO EVENT SHALL THE OpenSSL PROJECT OR .\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, .\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT .\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; .\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) .\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, .\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) .\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED .\" OF THE POSSIBILITY OF SUCH DAMAGE. .\" .Dd $Mdocdate: July 10 2022 $ .Dt DSA_METH_NEW 3 .Os .Sh NAME .Nm DSA_meth_new , .Nm DSA_meth_free , .Nm DSA_meth_dup , .Nm DSA_meth_get0_name , .Nm DSA_meth_set1_name , .Nm DSA_meth_set_sign , .Nm DSA_meth_set_finish .Nd build up DSA methods .Sh SYNOPSIS .In openssl/dsa.h .Ft DSA_METHOD * .Fo DSA_meth_new .Fa "const char *name" .Fa "int flags" .Fc .Ft void .Fo DSA_meth_free .Fa "DSA_METHOD *meth" .Fc .Ft DSA_METHOD * .Fo DSA_meth_dup .Fa "const DSA_METHOD *meth" .Fc .Ft const char * .Fo DSA_meth_get0_name .Fa "const DSA_METHOD *meth" .Fc .Ft int .Fo DSA_meth_set1_name .Fa "DSA_METHOD *meth" .Fa "const char *name" .Fc .Ft int .Fo DSA_meth_set_sign .Fa "DSA_METHOD *meth" .Fa "DSA_SIG *(*sign)(const unsigned char *, int, DSA *)" .Fc .Ft int .Fo DSA_meth_set_finish .Fa "DSA_METHOD *meth" .Fa "int (*finish)(DSA *)" .Fc .Sh DESCRIPTION The .Vt DSA_METHOD structure holds function pointers for custom DSA implementations. .Pp .Fn DSA_meth_new creates a new .Vt DSA_METHOD structure. A copy of the NUL-terminated .Fa name is stored in the new .Vt DSA_METHOD object. Any new .Vt DSA object constructed from this .Vt DSA_METHOD will have the given .Fa flags set by default. .Pp .Fn DSA_meth_dup creates a deep copy of .Fa meth . This might be useful for creating a new .Vt DSA_METHOD based on an existing one, but with some differences. .Pp .Fn DSA_meth_free destroys .Fa meth and frees any memory associated with it. .Pp .Fn DSA_meth_get0_name returns an internal pointer to the name of .Fa meth . .Fn DSA_meth_set1_name stores a copy of the NUL-terminated .Fa name in .Fa meth after freeing the previously stored name. Method names are ignored by the default DSA implementation but can be used by alternative implementations and by the application program. .Pp .Fn DSA_meth_set_sign sets the function used for creating a DSA signature. This function will be called from .Xr DSA_do_sign 3 and indirectly from .Xr DSA_sign 3 . The parameters of .Fa sign have the same meaning as for .Xr DSA_do_sign 3 . .Pp .Fn DSA_meth_set_finish sets an optional function for destroying a .Vt DSA object. Unless .Fa finish is .Dv NULL , it will be called from .Xr DSA_free 3 . It takes the same argument and is intended to do DSA implementation specific cleanup. The memory used by the .Vt DSA object itself should not be freed by the .Fa finish function. .Sh RETURN VALUES .Fn DSA_meth_new and .Fn DSA_meth_dup return the newly allocated .Vt DSA_METHOD object or .Dv NULL on failure. .Pp .Fn DSA_meth_get0_name returns an internal pointer which must not be freed by the caller. .Pp .Fn DSA_meth_set1_name and all .Fn DSA_meth_set_* functions return 1 on success or 0 on failure. In the current implementation, only .Fn DSA_meth_set1_name can actually fail. .Sh SEE ALSO .Xr DSA_do_sign 3 , .Xr DSA_new 3 , .Xr DSA_set_method 3 , .Xr DSA_SIG_new 3 , .Xr DSA_sign 3 .Sh HISTORY These functions first appeared in OpenSSL 1.1.0. .Pp .Fn DSA_meth_new , .Fn DSA_meth_free , .Fn DSA_meth_dup , .Fn DSA_meth_set_sign , and .Fn DSA_meth_set_finish have been available since .Ox 6.3 . .Pp .Fn DSA_meth_get0_name and .Fn DSA_meth_set1_name have been available since .Ox 7.2 .