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+.\" ========================================================================
+.\"
+.IX Title "DH_generate_parameters 3"
+.TH DH_generate_parameters 3 "2015-12-03" "1.0.2e" "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_generate_parameters_ex, DH_generate_parameters,
+DH_check \- generate and check Diffie\-Hellman parameters
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+.Vb 1
+\& #include <openssl/dh.h>
+\&
+\& int DH_generate_parameters_ex(DH *dh, int prime_len,int generator, BN_GENCB *cb);
+\&
+\& int DH_check(DH *dh, int *codes);
+.Ve
+.PP
+Deprecated:
+.PP
+.Vb 2
+\& DH *DH_generate_parameters(int prime_len, int generator,
+\&     void (*callback)(int, int, void *), void *cb_arg);
+.Ve
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+\&\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 prior to calling \fIDH_generate_parameters()\fR.
+.PP
+\&\fBprime_len\fR is the length in bits of the safe prime to be generated.
+\&\fBgenerator\fR is a small number > 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\fR\|(3) for information on
+the \fIBN_GENCB_call()\fR function.
+.PP
+\&\fIDH_check()\fR validates Diffie-Hellman parameters. It checks that \fBp\fR is
+a safe prime, and that \fBg\fR is a suitable generator. In the case of an
+error, the bit flags \s-1DH_CHECK_P_NOT_SAFE_PRIME\s0 or
+\&\s-1DH_NOT_SUITABLE_GENERATOR\s0 are set in \fB*codes\fR.
+\&\s-1DH_UNABLE_TO_CHECK_GENERATOR\s0 is set if the generator cannot be
+checked, i.e. it does not equal 2 or 5.
+.SH "RETURN VALUES"
+.IX Header "RETURN VALUES"
+\&\fIDH_generate_parameters_ex()\fR and \fIDH_check()\fR return 1 if the check could be
+performed, 0 otherwise.
+.PP
+\&\fIDH_generate_parameters()\fR (deprecated) returns a pointer to the \s-1DH\s0 structure, or
+\&\s-1NULL\s0 if the parameter generation fails.
+.PP
+The error codes can be obtained by \fIERR_get_error\fR\|(3).
+.SH "NOTES"
+.IX Header "NOTES"
+\&\fIDH_generate_parameters_ex()\fR and \fIDH_generate_parameters()\fR may run for several
+hours before finding a suitable prime.
+.PP
+The parameters generated by \fIDH_generate_parameters_ex()\fR and \fIDH_generate_parameters()\fR
+are not to be used in signature schemes.
+.SH "BUGS"
+.IX Header "BUGS"
+If \fBgenerator\fR is not 2 or 5, \fBdh\->g\fR=\fBgenerator\fR is not
+a usable generator.
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+\&\fIdh\fR\|(3), \fIERR_get_error\fR\|(3), \fIrand\fR\|(3),
+\&\fIDH_free\fR\|(3)
+.SH "HISTORY"
+.IX Header "HISTORY"
+\&\fIDH_check()\fR is available in all versions of SSLeay and OpenSSL.
+The \fBcb_arg\fR argument to \fIDH_generate_parameters()\fR was added in SSLeay 0.9.0.
+.PP
+In versions before OpenSSL 0.9.5, \s-1DH_CHECK_P_NOT_STRONG_PRIME\s0 is used
+instead of \s-1DH_CHECK_P_NOT_SAFE_PRIME.\s0