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.IX Title &quot;DH_GENERATE_PARAMETERS 3&quot;
.TH DH_GENERATE_PARAMETERS 3 &quot;2026-09-01&quot; &quot;1.1.1w&quot; &quot;OpenSSL&quot;
.\&quot; For nroff, turn off justification.  Always turn off hyphenation; it makes
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.SH &quot;NAME&quot;
DH_generate_parameters_ex, DH_generate_parameters, DH_check, DH_check_params, DH_check_ex, DH_check_params_ex, DH_check_pub_key_ex \&amp;\- generate and check Diffie\-Hellman parameters
.SH &quot;SYNOPSIS&quot;
.IX Header &quot;SYNOPSIS&quot;
.Vb 1
\&amp; #include &lt;openssl/dh.h&gt;
\&amp;
\&amp; int DH_generate_parameters_ex(DH *dh, int prime_len, int generator, BN_GENCB *cb);
\&amp;
\&amp; int DH_check(DH *dh, int *codes);
\&amp; int DH_check_params(DH *dh, int *codes);
\&amp;
\&amp; int DH_check_ex(const DH *dh);
\&amp; int DH_check_params_ex(const DH *dh);
\&amp; int DH_check_pub_key_ex(const DH *dh, const BIGNUM *pub_key);
.Ve
.PP
Deprecated:
.PP
.Vb 4
\&amp; #if OPENSSL_API_COMPAT &lt; 0x00908000L
\&amp; DH *DH_generate_parameters(int prime_len, int generator,
\&amp;                            void (*callback)(int, int, void *), void *cb_arg);
\&amp; #endif
.Ve
.SH &quot;DESCRIPTION&quot;
.IX Header &quot;DESCRIPTION&quot;
\&amp;\fIDH_generate_parameters_ex()\fR generates Diffie-Hellman parameters that can
be shared among a group of users, and stores them in the provided \fB\s-1DH\s0\fR
structure. The pseudo-random number generator must be
seeded before calling it.
The parameters generated by \fIDH_generate_parameters_ex()\fR should not be used in
signature schemes.
.PP
\&amp;\fBprime_len\fR is the length in bits of the safe prime to be generated.
\&amp;\fBgenerator\fR is a small number &gt; 1, typically 2 or 5.
.PP
A callback function may be used to provide feedback about the progress
of the key generation. If \fBcb\fR is not \fB\s-1NULL\s0\fR, it will be
called as described in \fIBN_generate_prime\fR\|(3) while a random prime
number is generated, and when a prime has been found, \fBBN_GENCB_call(cb, 3, 0)\fR
is called. See \fIBN_generate_prime_ex\fR\|(3) for information on
the \fIBN_GENCB_call()\fR function.
.PP
\&amp;\fIDH_generate_parameters()\fR is similar to \fIDH_generate_prime_ex()\fR but
expects an old-style callback function; see
\&amp;\fIBN_generate_prime\fR\|(3) for information on the old-style callback.
.PP
\&amp;\fIDH_check_params()\fR confirms that the \fBp\fR and \fBg\fR are likely enough to
be valid.
This is a lightweight check, if a more thorough check is needed, use
\&amp;\fIDH_check()\fR.
The value of \fB*codes\fR is updated with any problems found.
If \fB*codes\fR is zero then no problems were found, otherwise the
following bits may be set:
.IP &quot;\s-1DH_CHECK_P_NOT_PRIME\s0&quot; 4
.IX Item &quot;DH_CHECK_P_NOT_PRIME&quot;
The parameter \fBp\fR has been determined to not being an odd prime.
Note that the lack of this bit doesn't guarantee that \fBp\fR is a
prime.
.IP &quot;\s-1DH_NOT_SUITABLE_GENERATOR\s0&quot; 4
.IX Item &quot;DH_NOT_SUITABLE_GENERATOR&quot;
The generator \fBg\fR is not suitable.
Note that the lack of this bit doesn't guarantee that \fBg\fR is
suitable, unless \fBp\fR is known to be a strong prime.
.IP &quot;\s-1DH_MODULUS_TOO_LARGE\s0&quot; 4
.IX Item &quot;DH_MODULUS_TOO_LARGE&quot;
The modulus is too large.
.PP
\&amp;\fIDH_check()\fR confirms that the Diffie-Hellman parameters \fBdh\fR are valid. The
value of \fB*codes\fR is updated with any problems found. If \fB*codes\fR is zero then
no problems were found, otherwise the following bits may be set:
.IP &quot;\s-1DH_CHECK_P_NOT_PRIME\s0&quot; 4
.IX Item &quot;DH_CHECK_P_NOT_PRIME&quot;
The parameter \fBp\fR is not prime.
.IP &quot;\s-1DH_CHECK_P_NOT_SAFE_PRIME\s0&quot; 4
.IX Item &quot;DH_CHECK_P_NOT_SAFE_PRIME&quot;
The parameter \fBp\fR is not a safe prime and no \fBq\fR value is present.
.IP &quot;\s-1DH_UNABLE_TO_CHECK_GENERATOR\s0&quot; 4
.IX Item &quot;DH_UNABLE_TO_CHECK_GENERATOR&quot;
The generator \fBg\fR cannot be checked for suitability.
.IP &quot;\s-1DH_NOT_SUITABLE_GENERATOR\s0&quot; 4
.IX Item &quot;DH_NOT_SUITABLE_GENERATOR&quot;
The generator \fBg\fR is not suitable.
.IP &quot;\s-1DH_CHECK_Q_NOT_PRIME\s0&quot; 4
.IX Item &quot;DH_CHECK_Q_NOT_PRIME&quot;
The parameter \fBq\fR is not prime.
.IP &quot;\s-1DH_CHECK_INVALID_Q_VALUE\s0&quot; 4
.IX Item &quot;DH_CHECK_INVALID_Q_VALUE&quot;
The parameter \fBq\fR is invalid.
.IP &quot;\s-1DH_CHECK_INVALID_J_VALUE\s0&quot; 4
.IX Item &quot;DH_CHECK_INVALID_J_VALUE&quot;
The parameter \fBj\fR is invalid.
.PP
\&amp;\fIDH_check_ex()\fR, \fIDH_check_params()\fR and \fIDH_check_pub_key_ex()\fR are similar to
\&amp;\fIDH_check()\fR and \fIDH_check_params()\fR respectively, but the error reasons are added
to the thread's error queue instead of provided as return values from the
function.
.SH &quot;RETURN VALUES&quot;
.IX Header &quot;RETURN VALUES&quot;
\&amp;\fIDH_generate_parameters_ex()\fR, \fIDH_check()\fR and \fIDH_check_params()\fR return 1
if the check could be performed, 0 otherwise.
.PP
\&amp;\fIDH_generate_parameters()\fR returns a pointer to the \s-1DH\s0 structure or \s-1NULL\s0 if
the parameter generation fails.
.PP
\&amp;\fIDH_check_ex()\fR, \fIDH_check_params()\fR and \fIDH_check_pub_key_ex()\fR return 1 if the
check is successful, 0 for failed.
.PP
The error codes can be obtained by \fIERR_get_error\fR\|(3).
.SH &quot;SEE ALSO&quot;
.IX Header &quot;SEE ALSO&quot;
\&amp;\fIDH_new\fR\|(3), \fIERR_get_error\fR\|(3), \fIRAND_bytes\fR\|(3),
\&amp;\fIDH_free\fR\|(3)
.SH &quot;HISTORY&quot;
.IX Header &quot;HISTORY&quot;
\&amp;\fIDH_generate_parameters()\fR was deprecated in OpenSSL 0.9.8; use
\&amp;\fIDH_generate_parameters_ex()\fR instead.
.SH &quot;COPYRIGHT&quot;
.IX Header &quot;COPYRIGHT&quot;
Copyright 2000\-2018 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L&quot;License\*(R&quot;).  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
&lt;https://www.openssl.org/source/license.html&gt;.
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