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179 lines
4.7 KiB
179 lines
4.7 KiB
=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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