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DH_check.3
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.\" Automatically generated by Pod::Man 4.11 (Pod::Simple 3.35) .\" .\" Standard preamble: .\" ======================================================================== .de Sp \" Vertical space (when we can't use .PP) .if t .sp .5v .if n .sp .. .de Vb \" Begin verbatim text .ft CW .nf .ne \\$1 .. .de Ve \" End verbatim text .ft R .fi .. .\" Set up some character translations and predefined strings. \*(-- will .\" give an unbreakable dash, \*(PI will give pi, \*(L" will give a left .\" double quote, and \*(R" will give a right double quote. \*(C+ will .\" give a nicer C++. Capital omega is used to do unbreakable dashes and .\" therefore won't be available. \*(C` and \*(C' expand to `' in nroff, .\" nothing in troff, for use with C<>. .tr \(*W- .ds C+ C\v'-.1v'\h'-1p'\s-2+\h'-1p'+\s0\v'.1v'\h'-1p' .ie n \{\ . ds -- \(*W- . ds PI pi . if (\n(.H=4u)&(1m=24u) .ds -- \(*W\h'-12u'\(*W\h'-12u'-\" diablo 10 pitch . if (\n(.H=4u)&(1m=20u) .ds -- \(*W\h'-12u'\(*W\h'-8u'-\" diablo 12 pitch . ds L" "" . ds R" "" . ds C` "" . ds C' "" 'br\} .el\{\ . ds -- \|\(em\| . ds PI \(*p . ds L" `` . ds R" '' . ds C` . ds C' 'br\} .\" .\" Escape single quotes in literal strings from groff's Unicode transform. .ie \n(.g .ds Aq \(aq .el .ds Aq ' .\" .\" If the F register is >0, we'll generate index entries on stderr for .\" titles (.TH), headers (.SH), subsections (.SS), items (.Ip), and index .\" entries marked with X<> in POD. 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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" \&\fBDH_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 \fBDH_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 \fBBN_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 \fBBN_generate_prime\fR\|(3) for information on the \fBBN_GENCB_call()\fR function. .PP \&\fBDH_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" \&\fBDH_generate_parameters_ex()\fR and \fBDH_check()\fR return 1 if the check could be performed, 0 otherwise. .PP \&\fBDH_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 \fBERR_get_error\fR\|(3). .SH "NOTES" .IX Header "NOTES" \&\fBDH_generate_parameters_ex()\fR and \fBDH_generate_parameters()\fR may run for several hours before finding a suitable prime. .PP The parameters generated by \fBDH_generate_parameters_ex()\fR and \fBDH_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" \&\fBdh\fR\|(3), \fBERR_get_error\fR\|(3), \fBrand\fR\|(3), \&\fBDH_free\fR\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fBDH_check()\fR is available in all versions of SSLeay and OpenSSL. The \fBcb_arg\fR argument to \fBDH_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