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180 lines
4.7 KiB
Plaintext
180 lines
4.7 KiB
Plaintext
=pod
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=head1 NAME
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ecparam - EC parameter manipulation and generation
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=head1 SYNOPSIS
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B<openssl ecparam>
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[B<-inform DER|PEM>]
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[B<-outform DER|PEM>]
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[B<-in filename>]
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[B<-out filename>]
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[B<-noout>]
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[B<-text>]
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[B<-C>]
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[B<-check>]
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[B<-name arg>]
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[B<-list_curves>]
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[B<-conv_form arg>]
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[B<-param_enc arg>]
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[B<-no_seed>]
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[B<-rand file(s)>]
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[B<-genkey>]
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[B<-engine id>]
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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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=head1 OPTIONS
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=over 4
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=item B<-inform DER|PEM>
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This specifies the input format. The B<DER> option uses an ASN.1 DER encoded
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form compatible with RFC 3279 EcpkParameters. The PEM form is the default
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format: it consists of the B<DER> format base64 encoded with additional
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header and footer lines.
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=item B<-outform DER|PEM>
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This specifies the output format, the options have the same meaning as the
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B<-inform> option.
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=item B<-in 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 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<-C>
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This option converts the EC parameters into C code. The parameters can then
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be loaded by calling the B<get_ec_group_XXX()> function.
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=item B<-check>
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Validate the elliptic curve parameters.
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=item B<-name 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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If this options is specified B<ecparam> will print out a list of all
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currently implemented EC parameters names and exit.
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=item B<-conv_form>
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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> (the default
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value), B<uncompressed> 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 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 a 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 a EC private key using the specified parameters.
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=item B<-rand file(s)>
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a file or files containing random data used to seed the random number
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generator, or an EGD socket (see L<RAND_egd(3)|RAND_egd(3)>).
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Multiple files can be specified separated by a OS-dependent character.
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The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
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all others.
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=item B<-engine id>
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specifying an engine (by its unique B<id> string) will cause B<ecparam>
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to attempt to obtain a functional reference to the specified engine,
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thus initialising it if needed. The engine will then be set as the default
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for all available algorithms.
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=back
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=head1 NOTES
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PEM format EC parameters use the header and footer lines:
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-----BEGIN EC PARAMETERS-----
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-----END EC PARAMETERS-----
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OpenSSL is currently not able to generate new groups and therefore
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B<ecparam> can only create EC parameters from known (named) curves.
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=head1 EXAMPLES
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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<ec(1)|ec(1)>, L<dsaparam(1)|dsaparam(1)>
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=head1 HISTORY
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The ecparam command was first introduced in OpenSSL 0.9.8.
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=head1 AUTHOR
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Nils Larsch for the OpenSSL project (http://www.openssl.org)
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=cut
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