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ECPARAM(1)                                         OpenSSL                                        ECPARAM(1)



NAME
       ecparam - EC parameter manipulation and generation

SYNOPSIS
       openssl ecparam [-inform DER|PEM] [-outform DER|PEM] [-in filename] [-out filename] [-noout] [-text]
       [-C] [-check] [-name arg] [-list_curve] [-conv_form arg] [-param_enc arg] [-no_seed] [-rand file(s)]
       [-genkey] [-engine id]

DESCRIPTION
       This command is used to manipulate or generate EC parameter files.

OPTIONS
       -inform DER|PEM
           This specifies the input format. The 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 DER format base64
           encoded with additional header and footer lines.

       -outform DER|PEM
           This specifies the output format, the options have the same meaning as the -inform option.

       -in filename
           This specifies the input filename to read parameters from or standard input if this option is not
           specified.

       -out filename
           This specifies the output filename parameters to. Standard output is used if this option is not
           present. The output filename should not be the same as the input filename.

       -noout
           This option inhibits the output of the encoded version of the parameters.

       -text
           This option prints out the EC parameters in human readable form.

       -C  This option converts the EC parameters into C code. The parameters can then be loaded by calling
           the get_ec_group_XXX() function.

       -check
           Validate the elliptic curve parameters.

       -name arg
           Use the EC parameters with the specified 'short' name. Use -list_curves to get a list of all
           currently implemented EC parameters.

       -list_curves
           If this options is specified ecparam will print out a list of all currently implemented EC
           parameters names and exit.

       -conv_form
           This specifies how the points on the elliptic curve are converted into octet strings. Possible
           values are: compressed (the default value), uncompressed and hybrid. For more information
           regarding the point conversion forms please read the X9.62 standard.  Note Due to patent issues
           the compressed option is disabled by default for binary curves and can be enabled by defining the
           preprocessor macro OPENSSL_EC_BIN_PT_COMP at compile time.

       -param_enc arg
           This specifies how the elliptic curve parameters are encoded.  Possible value are: named_curve,
           i.e. the ec parameters are specified by a OID, or explicit where the ec parameters are explicitly
           given (see RFC 3279 for the definition of the EC parameters structures). The default value is
           named_curve.  Note the implicitlyCA alternative ,as specified in RFC 3279, is currently not
           implemented in OpenSSL.

       -no_seed
           This option inhibits that the 'seed' for the parameter generation is included in the ECParameters
           structure (see RFC 3279).

       -genkey
           This option will generate a EC private key using the specified parameters.

       -rand file(s)
           a file or files containing random data used to seed the random number generator, or an EGD socket
           (see RAND_egd(3)).  Multiple files can be specified separated by a OS-dependent character.  The
           separator is ; for MS-Windows, , for OpenVMS, and : for all others.

       -engine id
           specifying an engine (by it's unique id string) will cause 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.

NOTES
       PEM format EC parameters use the header and footer lines:

        -----BEGIN EC PARAMETERS----------END PARAMETERS---------END
        -----END EC PARAMETERS-----OpenSSL PARAMETERS----OpenSSL

       OpenSSL is currently not able to generate new groups and therefore ecparam can only create EC
       parameters from known (named) curves.

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

SEE ALSO
       ec(1), dsaparam(1)

HISTORY
       The ecparam command was first introduced in OpenSSL 0.9.8.

AUTHOR
       Nils Larsch for the OpenSSL project (http://www.openssl.org)



50                                               2013-03-05                                       ECPARAM(1)