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-.\" $OpenBSD: DH_generate_parameters.3,v 1.14 2022/07/13 13:47:59 schwarze Exp $
-.\" full merge up to: OpenSSL b97fdb57 Nov 11 09:33:09 2016 +0100
-.\" selective merge up to: OpenSSL b0edda11 Mar 20 13:00:17 2018 +0000
-.\"
-.\" This file is a derived work.
-.\" The changes are covered by the following Copyright and license:
-.\"
-.\" Copyright (c) 2022 Ingo Schwarze <schwarze@openbsd.org>
-.\"
-.\" 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. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
-.\" ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
-.\" WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
-.\" ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
-.\" OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
-.\"
-.\" The original file was written by Ulf Moeller <ulf@openssl.org>
-.\" and Matt Caswell <matt@openssl.org>.
-.\" Copyright (c) 2000, 2016 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: July 13 2022 $
-.Dt DH_GENERATE_PARAMETERS 3
-.Os
-.Sh NAME
-.Nm DH_generate_parameters_ex ,
-.Nm DH_check ,
-.Nm DH_check_pub_key ,
-.Nm DH_generate_parameters
-.Nd generate and check Diffie-Hellman parameters
-.Sh SYNOPSIS
-.In openssl/dh.h
-.Ft int
-.Fo DH_generate_parameters_ex
-.Fa "DH *dh"
-.Fa "int prime_len"
-.Fa "int generator"
-.Fa "BN_GENCB *cb"
-.Fc
-.Ft int
-.Fo DH_check
-.Fa "DH *dh"
-.Fa "int *codes"
-.Fc
-.Ft int
-.Fo DH_check_pub_key
-.Fa "const DH *dh"
-.Fa "const BIGNUM *pub_key"
-.Fa "int *codes"
-.Fc
-.Pp
-Deprecated:
-.Pp
-.Ft DH *
-.Fo DH_generate_parameters
-.Fa "int prime_len"
-.Fa "int generator"
-.Fa "void (*callback)(int, int, void *)"
-.Fa "void *cb_arg"
-.Fc
-.Sh DESCRIPTION
-.Fn DH_generate_parameters_ex
-generates Diffie-Hellman parameters that can be shared among a group of
-users, and stores them in the provided
-.Vt DH
-structure.
-.Pp
-.Fa prime_len
-is the length in bits of the safe prime to be generated.
-.Fa generator
-is a small number > 1, typically 2 or 5.
-.Pp
-A callback function may be used to provide feedback about the progress
-of the key generation.
-If
-.Fa cb
-is not
-.Dv NULL ,
-it will be called as described in
-.Xr BN_generate_prime 3
-while a random prime number is generated, and when a prime has been
-found,
-.Fn BN_GENCB_call cb 3 0
-is called; see
-.Xr BN_GENCB_call 3 .
-.Pp
-.Fn DH_check
-validates Diffie-Hellman parameters.
-If no problems are found,
-.Pf * Ar codes
-is set to zero.
-Otherwise, one or more of the following bits are set:
-.Bl -tag -width Ds
-.It Dv DH_CHECK_P_NOT_PRIME
-The parameter
-.Fa dh->p
-is not prime.
-.It Dv DH_CHECK_P_NOT_SAFE_PRIME
-The parameter
-.Fa dh->p
-is not a safe prime.
-.It Dv DH_UNABLE_TO_CHECK_GENERATOR
-The generator
-.Fa dh->g
-cannot be checked for suitability: it is neither 2 nor 5.
-.It Dv DH_NOT_SUITABLE_GENERATOR
-The generator
-.Fa dh->g
-is not suitable.
-.El
-.Pp
-.Fn DH_check_pub_key
-checks whether
-.Fa pub_key
-is a valid public key when using the domain parameters contained in
-.Fa dh .
-If no problems are found,
-.Pf * Ar codes
-is set to zero.
-Otherwise, one or more of the following bits are set:
-.Bl -tag -width Ds
-.It Dv DH_CHECK_PUBKEY_TOO_SMALL
-.Fa pub_key
-is less than or equal to 1.
-.It Dv DH_CHECK_PUBKEY_TOO_LARGE
-.Fa pub_key
-is greater than or equal to
-.Fa dh->p No \- 1 .
-.It DH_CHECK_PUBKEY_INVALID
-.Fa dh->q
-is set but
-.Fa pub_key
-to the power of
-.Fa dh->q
-is not 1 modulo
-.Fa dh->p .
-.El
-.Sh RETURN VALUES
-.Fn DH_generate_parameters_ex ,
-.Fn DH_check ,
-and
-.Fn DH_check_pub_key
-return 1 if the check could be performed or 0 otherwise.
-.Pp
-.Fn DH_generate_parameters
-(deprecated) returns a pointer to the
-.Vt DH
-structure, or
-.Dv NULL
-if the parameter generation fails.
-.Pp
-The error codes can be obtained by
-.Xr ERR_get_error 3 .
-.Sh SEE ALSO
-.Xr DH_get0_pqg 3 ,
-.Xr DH_new 3
-.Sh HISTORY
-.Fn DH_check
-and
-.Fn DH_generate_parameters
-first appeared in SSLeay 0.5.1 and have been available since
-.Ox 2.4 .
-.Pp
-The
-.Fa cb_arg
-argument to
-.Fn DH_generate_parameters
-was added in SSLeay 0.9.0.
-.Pp
-.Fn DH_check_pub_key
-first appeared in OpenSSL 0.9.8a and has been available since
-.Ox 4.0 .
-.Pp
-.Fn DH_generate_parameters_ex
-first appeared in OpenSSL 0.9.8 and has been available since
-.Ox 4.5 .
-.Sh CAVEATS
-.Fn DH_generate_parameters_ex
-and
-.Fn DH_generate_parameters
-may run for several hours before finding a suitable prime.
-.Pp
-The parameters generated by
-.Fn DH_generate_parameters_ex
-and
-.Fn DH_generate_parameters
-are not to be used in signature schemes.
-.Sh BUGS
-If
-.Fa generator
-is not 2 or 5,
-.Fa dh->g Ns = Ns Fa generator
-is not a usable generator.