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Diffstat (limited to 'roms/edk2/CryptoPkg/Library/OpensslLib/openssl/doc/man1/dhparam.pod')
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diff --git a/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/doc/man1/dhparam.pod b/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/doc/man1/dhparam.pod new file mode 100644 index 000000000..1b43b3231 --- /dev/null +++ b/roms/edk2/CryptoPkg/Library/OpensslLib/openssl/doc/man1/dhparam.pod @@ -0,0 +1,166 @@ +=pod + +=head1 NAME + +openssl-dhparam, +dhparam - DH parameter manipulation and generation + +=head1 SYNOPSIS + +B<openssl dhparam> +[B<-help>] +[B<-inform DER|PEM>] +[B<-outform DER|PEM>] +[B<-in> I<filename>] +[B<-out> I<filename>] +[B<-dsaparam>] +[B<-check>] +[B<-noout>] +[B<-text>] +[B<-C>] +[B<-2>] +[B<-5>] +[B<-rand file...>] +[B<-writerand file>] +[B<-engine id>] +[I<numbits>] + +=head1 DESCRIPTION + +This command is used to manipulate DH parameter files. + +=head1 OPTIONS + +=over 4 + +=item B<-help> + +Print out a usage message. + +=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 and default +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<-check> + +Performs numerous checks to see if the supplied parameters are valid and +displays a warning if not. + +=item B<-2>, B<-5> + +The generator to use, either 2 or 5. If present then the +input file is ignored and parameters are generated instead. If not +present but B<numbits> is present, parameters are generated with the +default generator 2. + +=item B<-rand file...> + +A file or files containing random data used to seed the random number +generator. +Multiple files can be specified separated by an OS-dependent character. +The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for +all others. + +=item [B<-writerand file>] + +Writes random data to the specified I<file> upon exit. +This can be used with a subsequent B<-rand> flag. + +=item I<numbits> + +This option specifies that a parameter set should be generated of size +I<numbits>. It must be the last option. If this option is present then +the input file is ignored and parameters are generated instead. If +this option is not present but a generator (B<-2> or B<-5>) is +present, parameters are generated with a default length of 2048 bits. + +=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 get_dhNNNN() function. + +=item B<-engine id> + +Specifying an engine (by its unique B<id> string) will cause B<dhparam> +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. 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)> + +=head1 COPYRIGHT + +Copyright 2000-2017 The OpenSSL Project Authors. All Rights Reserved. + +Licensed under the OpenSSL license (the "License"). You may not use +this file except in compliance with the License. You can obtain a copy +in the file LICENSE in the source distribution or at +L<https://www.openssl.org/source/license.html>. + +=cut |