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.\" ========================================================================
.\"
.IX Title "D2I_DHPARAMS 3"
.TH D2I_DHPARAMS 3 "2023-09-11" "1.1.1w" "OpenSSL"
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.SH "NAME"
d2i_DHparams, i2d_DHparams \- PKCS#3 DH parameter functions
.SH "SYNOPSIS"
.IX Header "SYNOPSIS"
.Vb 1
\& #include <openssl/dh.h>
\&
\& DH *d2i_DHparams(DH **a, const unsigned char **pp, long length);
\& int i2d_DHparams(DH *a, unsigned char **pp);
.Ve
.SH "DESCRIPTION"
.IX Header "DESCRIPTION"
These functions decode and encode PKCS#3 \s-1DH\s0 parameters using the
DHparameter structure described in PKCS#3.
.PP
Otherwise these behave in a similar way to \fBd2i_X509()\fR and \fBi2d_X509()\fR
described in the \fBd2i_X509\fR\|(3) manual page.
.SH "RETURN VALUES"
.IX Header "RETURN VALUES"
\&\fBd2i_DHparams()\fR returns a valid \fB\s-1DH\s0\fR structure or \s-1NULL\s0 if an error occurred.
.PP
\&\fBi2d_DHparams()\fR returns the length of encoded data on success or a value which
is less than or equal to 0 on error.
.SH "SEE ALSO"
.IX Header "SEE ALSO"
\&\fBd2i_X509\fR\|(3)
.SH "COPYRIGHT"
.IX Header "COPYRIGHT"
Copyright 2000\-2020 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (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>.