1.\" $OpenBSD: d2i_DHparams.3,v 1.8 2018/03/27 17:35:50 schwarze Exp $ 2.\" full merge up to: OpenSSL 61f805c1 Jan 16 01:01:46 2018 +0800 3.\" 4.\" This file was written by Ulf Moeller <ulf@openssl.org> and 5.\" Dr. Stephen Henson <steve@openssl.org>. 6.\" Copyright (c) 2000, 2002, 2015, 2017 The OpenSSL Project. 7.\" All rights reserved. 8.\" 9.\" Redistribution and use in source and binary forms, with or without 10.\" modification, are permitted provided that the following conditions 11.\" are met: 12.\" 13.\" 1. Redistributions of source code must retain the above copyright 14.\" notice, this list of conditions and the following disclaimer. 15.\" 16.\" 2. Redistributions in binary form must reproduce the above copyright 17.\" notice, this list of conditions and the following disclaimer in 18.\" the documentation and/or other materials provided with the 19.\" distribution. 20.\" 21.\" 3. All advertising materials mentioning features or use of this 22.\" software must display the following acknowledgment: 23.\" "This product includes software developed by the OpenSSL Project 24.\" for use in the OpenSSL Toolkit. (http://www.openssl.org/)" 25.\" 26.\" 4. The names "OpenSSL Toolkit" and "OpenSSL Project" must not be used to 27.\" endorse or promote products derived from this software without 28.\" prior written permission. For written permission, please contact 29.\" openssl-core@openssl.org. 30.\" 31.\" 5. Products derived from this software may not be called "OpenSSL" 32.\" nor may "OpenSSL" appear in their names without prior written 33.\" permission of the OpenSSL Project. 34.\" 35.\" 6. Redistributions of any form whatsoever must retain the following 36.\" acknowledgment: 37.\" "This product includes software developed by the OpenSSL Project 38.\" for use in the OpenSSL Toolkit (http://www.openssl.org/)" 39.\" 40.\" THIS SOFTWARE IS PROVIDED BY THE OpenSSL PROJECT ``AS IS'' AND ANY 41.\" EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 42.\" IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 43.\" PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE OpenSSL PROJECT OR 44.\" ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 45.\" SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 46.\" NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 47.\" LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 48.\" HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, 49.\" STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 50.\" ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED 51.\" OF THE POSSIBILITY OF SUCH DAMAGE. 52.\" 53.Dd $Mdocdate: March 27 2018 $ 54.Dt D2I_DHPARAMS 3 55.Os 56.Sh NAME 57.Nm d2i_DHparams , 58.Nm i2d_DHparams 59.Nd PKCS#3 DH parameter functions 60.Sh SYNOPSIS 61.In openssl/dh.h 62.Ft DH * 63.Fo d2i_DHparams 64.Fa "DH **a" 65.Fa "unsigned char **pp" 66.Fa "long length" 67.Fc 68.Ft int 69.Fo i2d_DHparams 70.Fa "DH *a" 71.Fa "unsigned char **pp" 72.Fc 73.Sh DESCRIPTION 74These functions decode and encode PKCS#3 DH parameters using the 75DHparameter structure described in PKCS#3. 76They otherwise behave in a way similar to 77.Xr d2i_X509 3 78and 79.Xr i2d_X509 3 . 80.Sh RETURN VALUES 81.Fn d2i_DHparams 82returns a 83.Vt DH 84object or 85.Dv NULL 86if an error occurs. 87.Pp 88.Fn i2d_DHparams 89returns the number of bytes successfully encoded or a value <= 0 90if an error occurs. 91.Sh SEE ALSO 92.Xr d2i_X509 3 , 93.Xr DH_new 3 94.Sh HISTORY 95.Fn d2i_DHparams 96and 97.Fn i2d_DHparams 98first appeared in SSLeay 0.5.1 and have been available since 99.Ox 2.4 . 100