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.\" Automatically generated by Pod::Man 2.27 (Pod::Simple 3.28) .\" .\" 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++. 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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, DH_check_params, DH_check_ex, DH_check_params_ex, DH_check_pub_key_ex \&\- 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); \& int DH_check_params(DH dh, int codes); \& \& int DH_check_ex(const DH dh); \& int DH_check_params_ex(const DH dh); \& int DH_check_pub_key_ex(const DH dh, const BIGNUM pub_key); .Ve .PP Deprecated: .PP .Vb 4 \& #if OPENSSL_API_COMPAT < 0x00908000L \& DH DH_generate_parameters(int prime_len, int generator, \& void (callback)(int, int, void ), void cb_arg); \& #endif .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 before calling it. The parameters generated by \fIDH_generate_parameters_ex()\fR should not be used in signature schemes. .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_ex\fR\\|(3) for information on the \fIBN_GENCB_call()\fR function. .PP \&\fIDH_generate_parameters()\fR is similar to \fIDH_generate_prime_ex()\fR but expects an old-style callback function; see \&\fIBN_generate_prime\fR\\|(3) for information on the old-style callback. .PP \&\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 \&\fIDH_check()\fR. The value of \fBcodes\fR is updated with any problems found. If \fBcodes\fR is zero then no problems were found, otherwise the following bits may be set: .IP "\s-1DH_CHECK_P_NOT_PRIME\s0" 4 .IX Item "DH_CHECK_P_NOT_PRIME" 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 "\s-1DH_NOT_SUITABLE_GENERATOR\s0" 4 .IX Item "DH_NOT_SUITABLE_GENERATOR" 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 "\s-1DH_MODULUS_TOO_LARGE\s0" 4 .IX Item "DH_MODULUS_TOO_LARGE" The modulus is too large. .PP \&\fIDH_check()\fR confirms that the Diffie-Hellman parameters \fBdh\fR are valid. The value of \fBcodes\fR is updated with any problems found. If \fBcodes\fR is zero then no problems were found, otherwise the following bits may be set: .IP "\s-1DH_CHECK_P_NOT_PRIME\s0" 4 .IX Item "DH_CHECK_P_NOT_PRIME" The parameter \fBp\fR is not prime. .IP "\s-1DH_CHECK_P_NOT_SAFE_PRIME\s0" 4 .IX Item "DH_CHECK_P_NOT_SAFE_PRIME" The parameter \fBp\fR is not a safe prime and no \fBq\fR value is present. .IP "\s-1DH_UNABLE_TO_CHECK_GENERATOR\s0" 4 .IX Item "DH_UNABLE_TO_CHECK_GENERATOR" The generator \fBg\fR cannot be checked for suitability. .IP "\s-1DH_NOT_SUITABLE_GENERATOR\s0" 4 .IX Item "DH_NOT_SUITABLE_GENERATOR" The generator \fBg\fR is not suitable. .IP "\s-1DH_CHECK_Q_NOT_PRIME\s0" 4 .IX Item "DH_CHECK_Q_NOT_PRIME" The parameter \fBq\fR is not prime. .IP "\s-1DH_CHECK_INVALID_Q_VALUE\s0" 4 .IX Item "DH_CHECK_INVALID_Q_VALUE" The parameter \fBq\fR is invalid. .IP "\s-1DH_CHECK_INVALID_J_VALUE\s0" 4 .IX Item "DH_CHECK_INVALID_J_VALUE" The parameter \fBj\fR is invalid. .PP \&\fIDH_check_ex()\fR, \fIDH_check_params()\fR and \fIDH_check_pub_key_ex()\fR are similar to \&\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 "RETURN VALUES" .IX Header "RETURN VALUES" \&\fIDH_generate_parameters_ex()\fR, \fIDH_check()\fR and \fIDH_check_params()\fR return 1 if the check could be performed, 0 otherwise. .PP \&\fIDH_generate_parameters()\fR returns a pointer to the \s-1DH\s0 structure or \s-1NULL\s0 if the parameter generation fails. .PP \&\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 "SEE ALSO" .IX Header "SEE ALSO" \&\fIDH_new\fR\\|(3), \fIERR_get_error\fR\\|(3), \fIRAND_bytes\fR\\|(3), \&\fIDH_free\fR\\|(3) .SH "HISTORY" .IX Header "HISTORY" \&\fIDH_generate_parameters()\fR was deprecated in OpenSSL 0.9.8; use \&\fIDH_generate_parameters_ex()\fR instead. .SH "COPYRIGHT" .IX Header "COPYRIGHT" Copyright 2000\-2018 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>.