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Title "DH_NEW_BY_NID 3" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
DH_new_by_nid, DH_get_nid - create or get DH named parameters Header "SYNOPSIS" .Vb 1 #include <openssl/dh.h> .Ve

The following functions have been deprecated since OpenSSL 3.0, and can be hidden entirely by defining \s-1OPENSSL_API_COMPAT\s0 with a suitable version value, see openssl_user_macros\|(7):

.Vb 1 DH *DH_new_by_nid(int nid); \& int DH_get_nid(const DH *dh); .Ve

Header "DESCRIPTION" \fBDH_new_by_nid() creates and returns a \s-1DH\s0 structure containing named parameters \fBnid. Currently nid must be NID_ffdhe2048, NID_ffdhe3072, \fBNID_ffdhe4096, NID_ffdhe6144, NID_ffdhe8192, \fBNID_modp_1536, NID_modp_2048, NID_modp_3072, \fBNID_modp_4096, NID_modp_6144 or NID_modp_8192.

\fBDH_get_nid() determines if the parameters contained in dh match any named safe prime group. It returns the \s-1NID\s0 corresponding to the matching parameters or NID_undef if there is no match. This function is deprecated.

Header "RETURN VALUES" \fBDH_new_by_nid() returns a set of \s-1DH\s0 parameters or \s-1NULL\s0 if an error occurred.

\fBDH_get_nid() returns the \s-1NID\s0 of the matching set of parameters for p and g and optionally q, otherwise it returns NID_undef if there is no match.

Header "HISTORY" All of these functions were deprecated in OpenSSL 3.0. Header "COPYRIGHT" Copyright 2017-2022 The OpenSSL Project Authors. All Rights Reserved.

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>.