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+.\"	$OpenBSD: DSA_set_method.3,v 1.13 2025/06/08 22:40:29 schwarze Exp $
+.\"	OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
+.\"
+.\" This file was written by Ulf Moeller <ulf@openssl.org>.
+.\" Copyright (c) 2000, 2002, 2007 The OpenSSL Project.  All rights reserved.
+.\"
+.\" Redistribution and use in source and binary forms, with or without
+.\" modification, are permitted provided that the following conditions
+.\" are met:
+.\"
+.\" 1. Redistributions of source code must retain the above copyright
+.\"    notice, this list of conditions and the following disclaimer.
+.\"
+.\" 2. Redistributions in binary form must reproduce the above copyright
+.\"    notice, this list of conditions and the following disclaimer in
+.\"    the documentation and/or other materials provided with the
+.\"    distribution.
+.\"
+.\" 3. All advertising materials mentioning features or use of this
+.\"    software must display the following acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit. (http://www.openssl.org/)"
+.\"
+.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to
+.\"    endorse or promote products derived from this software without
+.\"    prior written permission. For written permission, please contact
+.\"    openssl-core@openssl.org.
+.\"
+.\" 5. Products derived from this software may not be called "OpenSSL"
+.\"    nor may "OpenSSL" appear in their names without prior written
+.\"    permission of the OpenSSL Project.
+.\"
+.\" 6. Redistributions of any form whatsoever must retain the following
+.\"    acknowledgment:
+.\"    "This product includes software developed by the OpenSSL Project
+.\"    for use in the OpenSSL Toolkit (http://www.openssl.org/)"
+.\"
+.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY
+.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+.\" PURPOSE ARE DISCLAIMED.  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: June 8 2025 $
+.Dt DSA_SET_METHOD 3
+.Os
+.Sh NAME
+.Nm DSA_set_default_method ,
+.Nm DSA_get_default_method ,
+.Nm DSA_set_method ,
+.Nm DSA_new_method ,
+.Nm DSA_OpenSSL
+.Nd select DSA method
+.Sh SYNOPSIS
+.Lb libcrypto
+.In openssl/dsa.h
+.Ft void
+.Fo DSA_set_default_method
+.Fa "const DSA_METHOD *meth"
+.Fc
+.Ft const DSA_METHOD *
+.Fn DSA_get_default_method void
+.Ft int
+.Fo DSA_set_method
+.Fa "DSA *dsa"
+.Fa "const DSA_METHOD *meth"
+.Fc
+.Ft DSA *
+.Fo DSA_new_method
+.Fa "ENGINE *engine"
+.Fc
+.Ft DSA_METHOD *
+.Fn DSA_OpenSSL void
+.Sh DESCRIPTION
+A
+.Vt DSA_METHOD
+object contains pointers to the functions used for DSA operations.
+By default, the internal implementation returned by
+.Fn DSA_OpenSSL
+is used.
+By selecting another method, alternative implementations
+such as hardware accelerators may be used.
+.Pp
+.Fn DSA_set_default_method
+selects
+.Fa meth
+as the default method for all
+.Vt DSA
+structures created later.
+.Pp
+.Fn DSA_get_default_method
+returns a pointer to the current default method.
+.Pp
+.Fn DSA_set_method
+selects
+.Fa meth
+to perform all operations using the key
+.Fa dsa .
+This replaces the
+.Vt DSA_METHOD
+used by the DSA key.
+It is possible to have DSA keys that only work with certain
+.Vt DSA_METHOD
+implementations,
+and in such cases attempting to change the
+.Vt DSA_METHOD
+for the key can have unexpected results.
+.Pp
+.Fn DSA_new_method
+allocates and initializes a
+.Vt DSA
+structure.
+The
+.Fa engine
+argument is ignored and
+the default method controlled by
+.Fn DSA_set_default_method
+is used.
+.Pp
+The
+.Vt DSA_METHOD
+structure is defined as follows:
+.Bd -literal
+struct {
+	/* name of the implementation */
+	const char *name;
+	/* sign */
+	DSA_SIG *(*dsa_do_sign)(const unsigned char *dgst, int dlen,
+	    DSA *dsa);
+	/* pre-compute k^-1 and r */
+	int (*dsa_sign_setup)(DSA *dsa, BN_CTX *ctx_in, BIGNUM **kinvp,
+	    BIGNUM **rp);
+	/* verify */
+	int (*dsa_do_verify)(const unsigned char *dgst, int dgst_len,
+	    DSA_SIG *sig, DSA *dsa);
+	/* called at DSA_new */
+	int (*init)(DSA *DSA);
+	/* called at DSA_free */
+	int (*finish)(DSA *DSA);
+	int flags;
+} DSA_METHOD;
+.Ed
+.Sh RETURN VALUES
+.Fn DSA_OpenSSL
+and
+.Fn DSA_get_default_method
+return pointers to the respective
+.Vt DSA_METHOD .
+.Pp
+.Fn DSA_set_method
+returns 1 on success or 0 on failure.
+Currently, it cannot fail.
+.Pp
+.Fn DSA_new_method
+returns
+.Dv NULL
+and sets an error code that can be obtained by
+.Xr ERR_get_error 3
+if the allocation fails.
+Otherwise it returns a pointer to the newly allocated structure.
+.Sh SEE ALSO
+.Xr DSA_meth_new 3 ,
+.Xr DSA_new 3
+.Sh HISTORY
+.Fn DSA_set_default_method ,
+.Fn DSA_get_default_method ,
+.Fn DSA_set_method ,
+.Fn DSA_new_method ,
+and
+.Fn DSA_OpenSSL
+first appeared in OpenSSL 0.9.5 and have been available since
+.Ox 2.7 .