a528d4f0a9
If something was "present in all versions" of SSLeay, or if it was added to a version of SSLeay (and therefore predates OpenSSL), remove mention of it. Documentation history now starts with OpenSSL. Remove mention of all history before OpenSSL 0.9.8, inclusive. Remove all AUTHOR sections. Reviewed-by: Tim Hudson <tjh@openssl.org>
172 lines
4.5 KiB
Plaintext
172 lines
4.5 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)>).
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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)>, L<dsaparam(1)>
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=cut
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