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.IX Title "OPENSSL\-DHPARAM 1ssl"
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.TH OPENSSL\-DHPARAM 1ssl "5 août 2025" 3.5.2 OpenSSL
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.SH NOM
openssl\-dhparam \- Manipulation et génération de paramètres DH
.SH SYNOPSIS
.IX Header SYNOPSIS
\&\fBopenssl dhparam\fP [\fB\-help\fP] [\fB\-inform\fP \fBDER\fP|\fBPEM\fP] [\fB\-outform\fP
\fBDER\fP|\fBPEM\fP] [\fB\-in\fP \fIfilename\fP] [\fB\-out\fP \fIfilename\fP] [\fB\-dsaparam\fP]
[\fB\-check\fP] [\fB\-noout\fP] [\fB\-text\fP] [\fB\-verbose\fP] [\fB\-quiet\fP] [\fB\-2\fP] [\fB\-3\fP]
[\fB\-5\fP] [\fB\-engine\fP \fIid\fP] [\fB\-rand\fP \fIfiles\fP] [\fB\-writerand\fP \fIfile\fP]
[\fB\-provider\fP \fIname\fP] [\fB\-provider\-path\fP \fIpath\fP] [\fB\-provparam\fP
\fI[name:]key=value\fP] [\fB\-propquery\fP \fIpropq\fP] [\fInumbits\fP]
.SH DESCRIPTION
.IX Header DESCRIPTION
Cette commande sert à manipuler des fichiers de paramètres DH.
.PP
See "EXAMPLES" in \fBopenssl\-genpkey\fP\|(1) for examples on how to generate a
key using a named safe prime group without generating intermediate
parameters.
.SH OPTIONS
.IX Header OPTIONS
.IP \fB\-help\fP 4
.IX Item \-help
Afficher un message d'utilisation.
.IP "\fB\-inform\fP \fBDER\fP|\fBPEM\fP, \fB\-outform\fP \fBDER\fP|\fBPEM\fP" 4
.IX Item "\-inform DER|PEM, \-outform DER|PEM"
The input format and output format; the default is \fBPEM\fP.  The object is
compatible with the PKCS#3 \fBDHparameter\fP structure.  See
\fBopenssl\-format\-options\fP\|(1) for details.
.IP "\fB\-in\fP \fIfichier\fP" 4
.IX Item "\-in fichier"
This specifies the input file to read parameters from or standard input if
this option is not specified.
.IP "\fB\-out\fP \fIfilename\fP" 4
.IX Item "\-out fichier"
This specifies the output file to write parameters to.  Standard output is
used if this option is not present.  The output filename can be the same as
the input filename, which leads to replacing the file contents.  Note that
file I/O is not atomic. The output file is truncated and then written.
.IP \fB\-dsaparam\fP 4
.IX Item \-dsaparam
If this option is used, DSA rather than DH parameters are read or created;
they are converted to DH format.  Otherwise, safe primes (such that (p\-1)/2
is also prime) will be used for DH parameter generation.
.Sp
DH parameter generation with the \fB\-dsaparam\fP option is much faster.  Beware
that with such DSA\-style DH parameters, a fresh DH key should be created for
each use to avoid small\-subgroup attacks that may be possible otherwise.
.IP \fB\-check\fP 4
.IX Item \-check
Performs numerous checks to see if the supplied parameters are valid and
displays a warning if not.
.IP "\fB\-2\fP, \fB\-3\fP, \fB\-5\fP" 4
.IX Item "\-2, \-3, \-5"
The generator to use, either 2, 3 or 5. If present then the input file is
ignored and parameters are generated instead. If not present but \fInumbits\fP
is present, parameters are generated with the default generator 2.
.IP \fInombrebits\fP 4
.IX Item nombrebits
This option specifies that a parameter set should be generated of size
\&\fInumbits\fP. It must be the last option. If this option is present then the
input file is ignored and parameters are generated instead. If this option
is not present but a generator (\fB\-2\fP, \fB\-3\fP or \fB\-5\fP) is present,
parameters are generated with a default length of 2048 bits.  The minimum
length is 512 bits. The maximum length is 10000 bits.
.IP \fB\-noout\fP 4
.IX Item \-noout
Cette option empêche la sortie des paramètres en version encodée.
.IP \fB\-text\fP 4
.IX Item \-text
Cette option affiche les paramètres DH sous forme lisible.
.IP "\fB\-engine\fP \fIid\fP" 4
.IX Item "\-engine id"
Voir « Options de moteur » dans \fBopenssl\fP\|(1). Cette option est obsolète.
.IP "\fB\-rand\fP \fIfichiers\fP, \fB\-writerand\fP \fIfichier\fP" 4
.IX Item "\-rand fichiers, \-writerand fichier"
Voir « Options d'état aléatoire » dans \fBopenssl\fP\|(1) pour des détails.
.IP "\fB\-provider\fP \fInom\fP" 4
.IX Item "\-provider nom"
.PD 0
.IP "\fB\-provider\-path\fP \fIchemin\fP" 4
.IX Item "\-provider\-path chemin"
.IP "\fB\-provparam\fP \fI[nom:]clé=valeur\fP]" 4
.IX Item "\-provparam [nom:]clé=valeur"
.IP "\fB\-propquery\fP \fIpropq\fP" 4
.IX Item "\-propquery propq"
.PD
Voir « Options de fournisseur » dans \fBopenssl\fP\|(1), \fBprovider\fP\|(7) et
\fBproperty\fP\|(7).
.IP \fB\-verbose\fP 4
.IX Item \-verbose
This option enables the output of progress messages, which is handy when
running commands interactively that may take a long time to execute.
.IP \fB\-quiet\fP 4
.IX Item \-quiet
This option suppresses the output of progress messages, which may be
undesirable in batch scripts or pipelines.
.SH NOTES
.IX Header NOTES
This command replaces the \fBdh\fP and \fBgendh\fP commands of previous releases.
.SH "VOIR AUSSI"
.IX Header "VOIR AUSSI"
\&\fBopenssl\fP\|(1), \&\fBopenssl\-pkeyparam\fP\|(1), \&\fBopenssl\-dsaparam\fP\|(1),
\&\fBopenssl\-genpkey\fP\|(1).
.SH HISTORIQUE
.IX Header HISTORIQUE
L’option \fB\-engine\fP est obsolète dans OpenSSL 1.0.2b.
.PP
The \fB\-C\fP option was removed in OpenSSL 3.0.
.SH COPYRIGHT
.IX Header COPYRIGHT
Copyright 2000\-2023 Les auteurs du projet OpenSSL. Tous droits réservés.
.PP
Sous licence Apache 2.0 (la « Licence »). Vous ne pouvez utiliser ce fichier
que conformément à la Licence. Vous trouverez une copie dans le fichier
\s-1LICENSE\s0 de la distribution du source ou à l'adresse
<https://www.openssl.org/source/license.html>.
.PP
.SH TRADUCTION
La traduction française de cette page de manuel a été créée par
arne,
Nicolas François <nicolas.francois@centraliens.net>
et
David Prévot <david@tilapin.org>
.
.PP
Cette traduction est une documentation libre ; veuillez vous reporter à la
.UR https://www.gnu.org/licenses/gpl-3.0.html
GNU General Public License version 3
.UE
concernant les conditions de copie et 
de distribution. Il n'y a aucune RESPONSABILITÉ LÉGALE.
.PP
Si vous découvrez un bogue dans la traduction de cette page de manuel, 
veuillez envoyer un message à
.MT debian-l10n-french@lists.debian.org
.ME .