mirror of https://github.com/openssl/openssl
187 lines
4.9 KiB
Plaintext
187 lines
4.9 KiB
Plaintext
=pod
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{- OpenSSL::safe::output_do_not_edit_headers(); -}
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=head1 NAME
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openssl-ecparam - EC parameter manipulation and generation
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=head1 SYNOPSIS
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B<openssl ecparam>
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[B<-help>]
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[B<-inform> B<DER>|B<PEM>]
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[B<-outform> B<DER>|B<PEM>]
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[B<-in> I<filename>]
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[B<-out> I<filename>]
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[B<-noout>]
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[B<-text>]
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[B<-check>]
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[B<-check_named>]
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[B<-name> I<arg>]
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[B<-list_curves>]
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[B<-conv_form> I<arg>]
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[B<-param_enc> I<arg>]
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[B<-no_seed>]
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[B<-genkey>]
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{- $OpenSSL::safe::opt_engine_synopsis -}{- $OpenSSL::safe::opt_r_synopsis -}
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{- $OpenSSL::safe::opt_provider_synopsis -}
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=head1 DESCRIPTION
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This command is used to manipulate or generate EC parameter files.
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OpenSSL is currently not able to generate new groups and therefore
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this command can only create EC parameters from known (named) curves.
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=head1 OPTIONS
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=over 4
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=item B<-help>
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Print out a usage message.
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=item B<-inform> B<DER>|B<PEM>
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The EC parameters input format; unspecified by default.
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See L<openssl-format-options(1)> for details.
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=item B<-outform> B<DER>|B<PEM>
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The EC parameters output format; the default is B<PEM>.
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See L<openssl-format-options(1)> for details.
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Parameters are encoded as B<EcpkParameters> as specified in IETF RFC 3279.
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=item B<-in> I<filename>
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This specifies the input filename to read parameters from or standard input if
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this option is not specified.
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=item B<-out> I<filename>
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This specifies the output filename parameters to. Standard output is used
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if this option is not present. The output filename should B<not> be the same
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as the input filename.
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=item B<-noout>
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This option inhibits the output of the encoded version of the parameters.
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=item B<-text>
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This option prints out the EC parameters in human readable form.
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=item B<-check>
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Validate the elliptic curve parameters.
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=item B<-check_named>
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Validate the elliptic name curve parameters by checking if the curve parameters
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match any built-in curves.
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=item B<-name> I<arg>
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Use the EC parameters with the specified 'short' name. Use B<-list_curves>
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to get a list of all currently implemented EC parameters.
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=item B<-list_curves>
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Print out a list of all currently implemented EC parameters names and exit.
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=item B<-conv_form> I<arg>
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This specifies how the points on the elliptic curve are converted
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into octet strings. Possible values are: B<compressed>, B<uncompressed> (the
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default value) and B<hybrid>. For more information regarding
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the point conversion forms please read the X9.62 standard.
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B<Note> Due to patent issues the B<compressed> option is disabled
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by default for binary curves and can be enabled by defining
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the preprocessor macro B<OPENSSL_EC_BIN_PT_COMP> at compile time.
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=item B<-param_enc> I<arg>
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This specifies how the elliptic curve parameters are encoded.
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Possible value are: B<named_curve>, i.e. the ec parameters are
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specified by an OID, or B<explicit> where the ec parameters are
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explicitly given (see RFC 3279 for the definition of the
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EC parameters structures). The default value is B<named_curve>.
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B<Note> the B<implicitlyCA> alternative, as specified in RFC 3279,
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is currently not implemented in OpenSSL.
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=item B<-no_seed>
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This option inhibits that the 'seed' for the parameter generation
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is included in the ECParameters structure (see RFC 3279).
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=item B<-genkey>
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This option will generate an EC private key using the specified parameters.
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{- $OpenSSL::safe::opt_engine_item -}
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{- $OpenSSL::safe::opt_r_item -}
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{- $OpenSSL::safe::opt_provider_item -}
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=back
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The L<openssl-genpkey(1)> and L<openssl-pkeyparam(1)> commands are capable
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of performing all the operations this command can, as well as supporting
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other public key types.
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=head1 EXAMPLES
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The documentation for the L<openssl-genpkey(1)> and L<openssl-pkeyparam(1)>
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commands contains examples equivalent to the ones listed here.
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To create EC parameters with the group 'prime192v1':
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openssl ecparam -out ec_param.pem -name prime192v1
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To create EC parameters with explicit parameters:
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openssl ecparam -out ec_param.pem -name prime192v1 -param_enc explicit
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To validate given EC parameters:
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openssl ecparam -in ec_param.pem -check
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To create EC parameters and a private key:
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openssl ecparam -out ec_key.pem -name prime192v1 -genkey
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To change the point encoding to 'compressed':
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openssl ecparam -in ec_in.pem -out ec_out.pem -conv_form compressed
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To print out the EC parameters to standard output:
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openssl ecparam -in ec_param.pem -noout -text
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=head1 SEE ALSO
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L<openssl(1)>,
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L<openssl-pkeyparam(1)>,
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L<openssl-genpkey(1)>,
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L<openssl-ec(1)>,
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L<openssl-dsaparam(1)>
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=head1 HISTORY
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The B<-engine> option was deprecated in OpenSSL 3.0.
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The B<-C> option was removed in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2003-2021 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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