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+=pod
+
+=head1 NAME
+
+ecparam - EC parameter manipulation and generation
+
+=head1 SYNOPSIS
+
+B<openssl ecparam>
+[B<-inform DER|PEM>]
+[B<-outform DER|PEM>]
+[B<-in filename>]
+[B<-out filename>]
+[B<-noout>]
+[B<-text>]
+[B<-C>]
+[B<-check>]
+[B<-name arg>]
+[B<-list_curve>]
+[B<-conv_form arg>]
+[B<-param_enc arg>]
+[B<-no_seed>]
+[B<-rand file(s)>]
+[B<-genkey>]
+[B<-engine id>]
+
+=head1 DESCRIPTION
+
+This command is used to manipulate or generate EC parameter files.
+
+=head1 OPTIONS
+
+=over 4
+
+=item B<-inform DER|PEM>
+
+This specifies the input format. The B<DER> option uses an ASN.1 DER encoded
+form compatible with RFC 3279 EcpkParameters. 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 as the 
+B<-inform> option.
+
+=item B<-in filename>
+
+This specifies the input filename to read parameters from or standard input if
+this option is not specified.
+
+=item B<-out 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<-noout>
+
+This option inhibits the output of the encoded version of the parameters.
+
+=item B<-text>
+
+This option prints out the EC parameters in human readable form.
+
+=item B<-C>
+
+This option converts the EC parameters into C code. The parameters can then
+be loaded by calling the B<get_ec_group_XXX()> function.
+
+=item B<-check>
+
+Validate the elliptic curve parameters.
+
+=item B<-name arg>
+
+Use the EC parameters with the specified 'short' name. Use B<-list_curves>
+to get a list of all currently implemented EC parameters.
+
+=item B<-list_curves>
+
+If this options is specified B<ecparam> will print out a list of all
+currently implemented EC parameters names and exit.
+
+=item B<-conv_form>
+
+This specifies how the points on the elliptic curve are converted
+into octet strings. Possible values are: B<compressed> (the default
+value), B<uncompressed> and B<hybrid>. For more information regarding
+the point conversion forms please read the X9.62 standard.
+B<Note> Due to patent issues the B<compressed> option is disabled
+by default for binary curves and can be enabled by defining
+the preprocessor macro B<OPENSSL_EC_BIN_PT_COMP> at compile time.
+
+=item B<-param_enc arg>
+
+This specifies how the elliptic curve parameters are encoded.
+Possible value are: B<named_curve>, i.e. the ec parameters are
+specified by a OID, or B<explicit> where the ec parameters are
+explicitly given (see RFC 3279 for the definition of the 
+EC parameters structures). The default value is B<named_curve>.
+B<Note> the B<implicitlyCA> alternative ,as specified in RFC 3279,
+is currently not implemented in OpenSSL.
+
+=item B<-no_seed>
+
+This option inhibits that the 'seed' for the parameter generation
+is included in the ECParameters structure (see RFC 3279).
+
+=item B<-genkey>
+
+This option will generate a EC private key using the specified parameters.
+
+=item B<-rand file(s)>
+
+a file or files containing random data used to seed the random number
+generator, or an EGD socket (see L<RAND_egd(3)|RAND_egd(3)>).
+Multiple files can be specified separated by a OS-dependent character.
+The separator is B<;> for MS-Windows, B<,> for OpenVMS, and B<:> for
+all others.
+
+=item B<-engine id>
+
+specifying an engine (by it's unique B<id> string) will cause B<req>
+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 NOTES
+
+PEM format EC parameters use the header and footer lines:
+
+ -----BEGIN EC PARAMETERS-----
+ -----END EC PARAMETERS-----
+
+OpenSSL is currently not able to generate new groups and therefore
+B<ecparam> can only create EC parameters from known (named) curves. 
+
+=head1 EXAMPLES
+
+To create EC parameters with the group 'prime192v1':
+
+  openssl ecparam -out ec_param.pem -name prime192v1
+
+To create EC parameters with explicit parameters:
+
+  openssl ecparam -out ec_param.pem -name prime192v1 -param_enc explicit
+
+To validate given EC parameters:
+
+  openssl ecparam -in ec_param.pem -check
+
+To create EC parameters and a private key:
+
+  openssl ecparam -out ec_key.pem -name prime192v1 -genkey
+
+To change the point encoding to 'compressed':
+
+  openssl ecparam -in ec_in.pem -out ec_out.pem -conv_form compressed
+
+To print out the EC parameters to standard output:
+
+  openssl ecparam -in ec_param.pem -noout -text
+
+=head1 SEE ALSO
+
+L<ec(1)|ec(1)>, L<dsaparam(1)|dsaparam(1)>
+
+=head1 HISTORY
+
+The ecparam command was first introduced in OpenSSL 0.9.8.
+
+=head1 AUTHOR
+
+Nils Larsch for the OpenSSL project (http://www.openssl.org)
+
+=cut