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.\" ========================================================================
.\"
.IX Title "DH_NEW_BY_NID 3ossl"
.TH DH_NEW_BY_NID 3ossl "2023-09-19" "3.0.11" "OpenSSL"
.\" For nroff, turn off justification. Always turn off hyphenation; it makes
.\" way too many mistakes in technical documents.
.if n .ad l
.nh
.SH "NAME"
DH_new_by_nid, DH_get_nid \- create or get DH named parameters
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/dh.h>
.Ve
.PP
The following functions have been deprecated since OpenSSL 3.0, and can be
hidden entirely by defining \fB\s-1OPENSSL_API_COMPAT\s0\fR with a suitable version value,
see \fBopenssl_user_macros\fR\|(7):
.PP
.Vb 1
\& DH *DH_new_by_nid(int nid);
\&
\& int DH_get_nid(const DH *dh);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
\&\fBDH_new_by_nid()\fR creates and returns a \s-1DH\s0 structure containing named parameters
\&\fBnid\fR. Currently \fBnid\fR must be \fBNID_ffdhe2048\fR, \fBNID_ffdhe3072\fR,
\&\fBNID_ffdhe4096\fR, \fBNID_ffdhe6144\fR, \fBNID_ffdhe8192\fR,
\&\fBNID_modp_1536\fR, \fBNID_modp_2048\fR, \fBNID_modp_3072\fR,
\&\fBNID_modp_4096\fR, \fBNID_modp_6144\fR or \fBNID_modp_8192\fR.
.PP
\&\fBDH_get_nid()\fR determines if the parameters contained in \fBdh\fR match
any named safe prime group. It returns the \s-1NID\s0 corresponding to the matching
parameters or \fBNID_undef\fR if there is no match.
This function is deprecated.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBDH_new_by_nid()\fR returns a set of \s-1DH\s0 parameters or \fB\s-1NULL\s0\fR if an error occurred.
.PP
\&\fBDH_get_nid()\fR returns the \s-1NID\s0 of the matching set of parameters for p and g
and optionally q, otherwise it returns \fBNID_undef\fR if there is no match.
.SH "HISTORY"
.IX Header "HISTORY"
All of these functions were deprecated in OpenSSL 3.0.
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2017\-2022 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the Apache License 2.0 (the \*(L"License\*(R"). You may not use
this file except in compliance with the License. You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
<https://www.openssl.org/source/license.html>.
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