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author | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
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committer | marha <marha@users.sourceforge.net> | 2009-06-28 22:07:26 +0000 |
commit | 3562e78743202e43aec8727005182a2558117eca (patch) | |
tree | 8f9113a77d12470c5c851a2a8e4cb02e89df7d43 /openssl/doc/apps/dhparam.pod | |
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Diffstat (limited to 'openssl/doc/apps/dhparam.pod')
-rw-r--r-- | openssl/doc/apps/dhparam.pod | 141 |
1 files changed, 141 insertions, 0 deletions
diff --git a/openssl/doc/apps/dhparam.pod b/openssl/doc/apps/dhparam.pod new file mode 100644 index 000000000..c31db95a4 --- /dev/null +++ b/openssl/doc/apps/dhparam.pod @@ -0,0 +1,141 @@ +=pod + +=head1 NAME + +dhparam - DH parameter manipulation and generation + +=head1 SYNOPSIS + +B<openssl dhparam> +[B<-inform DER|PEM>] +[B<-outform DER|PEM>] +[B<-in> I<filename>] +[B<-out> I<filename>] +[B<-dsaparam>] +[B<-noout>] +[B<-text>] +[B<-C>] +[B<-2>] +[B<-5>] +[B<-rand> I<file(s)>] +[B<-engine id>] +[I<numbits>] + +=head1 DESCRIPTION + +This command is used to manipulate DH parameter files. + +=head1 OPTIONS + +=over 4 + +=item B<-inform DER|PEM> + +This specifies the input format. The B<DER> option uses an ASN1 DER encoded +form compatible with the PKCS#3 DHparameter structure. The PEM form is the +default format: it consists of the B<DER> format base64 encoded with +additional header and footer lines. + +=item B<-outform DER|PEM> + +This specifies the output format, the options have the same meaning as the +B<-inform> option. + +=item B<-in> I<filename> + +This specifies the input filename to read parameters from or standard input if +this option is not specified. + +=item B<-out> I<filename> + +This specifies the output filename parameters to. Standard output is used +if this option is not present. The output filename should B<not> be the same +as the input filename. + +=item B<-dsaparam> + +If this option is used, DSA rather than DH parameters are read or created; +they are converted to DH format. Otherwise, "strong" primes (such +that (p-1)/2 is also prime) will be used for DH parameter generation. + +DH parameter generation with the B<-dsaparam> option is much faster, +and the recommended exponent length is shorter, which makes DH key +exchange more efficient. Beware that with such DSA-style DH +parameters, a fresh DH key should be created for each use to +avoid small-subgroup attacks that may be possible otherwise. + +=item B<-2>, B<-5> + +The generator to use, either 2 or 5. 2 is the default. If present then the +input file is ignored and parameters are generated instead. + +=item B<-rand> I<file(s)> + +a file or files containing random data used to seed the random number +generator, or an EGD socket (see L<RAND_egd(3)|RAND_egd(3)>). +Multiple files can be specified separated by a OS-dependent character. +The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for +all others. + +=item I<numbits> + +this option specifies that a parameter set should be generated of size +I<numbits>. It must be the last option. If not present then a value of 512 +is used. If this option is present then the input file is ignored and +parameters are generated instead. + +=item B<-noout> + +this option inhibits the output of the encoded version of the parameters. + +=item B<-text> + +this option prints out the DH parameters in human readable form. + +=item B<-C> + +this option converts the parameters into C code. The parameters can then +be loaded by calling the B<get_dh>I<numbits>B<()> function. + +=item B<-engine id> + +specifying an engine (by it's unique B<id> string) will cause B<req> +to attempt to obtain a functional reference to the specified engine, +thus initialising it if needed. The engine will then be set as the default +for all available algorithms. + +=back + +=head1 WARNINGS + +The program B<dhparam> combines the functionality of the programs B<dh> and +B<gendh> in previous versions of OpenSSL and SSLeay. The B<dh> and B<gendh> +programs are retained for now but may have different purposes in future +versions of OpenSSL. + +=head1 NOTES + +PEM format DH parameters use the header and footer lines: + + -----BEGIN DH PARAMETERS----- + -----END DH PARAMETERS----- + +OpenSSL currently only supports the older PKCS#3 DH, not the newer X9.42 +DH. + +This program manipulates DH parameters not keys. + +=head1 BUGS + +There should be a way to generate and manipulate DH keys. + +=head1 SEE ALSO + +L<dsaparam(1)|dsaparam(1)> + +=head1 HISTORY + +The B<dhparam> command was added in OpenSSL 0.9.5. +The B<-dsaparam> option was added in OpenSSL 0.9.6. + +=cut |