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<?xml version="1.0" ?> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>ecparam</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@hsxx.drive.ne.jp" /> </head> <body style="background-color: white"> <!-- INDEX BEGIN --> <div name="index"> <p><a name="__index__"></a></p> <ul> <li><a href="#name">NAME</a></li> <li><a href="#synopsis">SYNOPSIS</a></li> <li><a href="#description">DESCRIPTION</a></li> <li><a href="#options">OPTIONS</a></li> <li><a href="#notes">NOTES</a></li> <li><a href="#examples">EXAMPLES</a></li> <li><a href="#see_also">SEE ALSO</a></li> <li><a href="#copyright">COPYRIGHT</a></li> </ul> <hr name="index" /> </div> <!-- INDEX END --> <p> </p> <hr /> <h1><a name="name">NAME</a></h1> <p>openssl-ecparam, ecparam - EC parameter manipulation and generation</p> <p> </p> <hr /> <h1><a name="synopsis">SYNOPSIS</a></h1> <p><strong>openssl ecparam</strong> [<strong>-help</strong>] [<strong>-inform DER|PEM</strong>] [<strong>-outform DER|PEM</strong>] [<strong>-in filename</strong>] [<strong>-out filename</strong>] [<strong>-noout</strong>] [<strong>-text</strong>] [<strong>-C</strong>] [<strong>-check</strong>] [<strong>-name arg</strong>] [<strong>-list_curves</strong>] [<strong>-conv_form arg</strong>] [<strong>-param_enc arg</strong>] [<strong>-no_seed</strong>] [<strong>-rand file...</strong>] [<strong>-writerand file</strong>] [<strong>-genkey</strong>] [<strong>-engine id</strong>]</p> <p> </p> <hr /> <h1><a name="description">DESCRIPTION</a></h1> <p>This command is used to manipulate or generate EC parameter files.</p> <p> </p> <hr /> <h1><a name="options">OPTIONS</a></h1> <dl> <dt><strong><a name="help" class="item"><strong>-help</strong></a></strong></dt> <dd> <p>Print out a usage message.</p> </dd> <dt><strong><a name="inform_der_pem" class="item"><strong>-inform DER|PEM</strong></a></strong></dt> <dd> <p>This specifies the input format. The <strong>DER</strong> option uses an ASN.1 DER encoded form compatible with <a href="http://www.ietf.org/rfc/rfc3279.txt" class="rfc">RFC 3279</a> EcpkParameters. The PEM form is the default format: it consists of the <strong>DER</strong> format base64 encoded with additional header and footer lines.</p> </dd> <dt><strong><a name="outform_der_pem" class="item"><strong>-outform DER|PEM</strong></a></strong></dt> <dd> <p>This specifies the output format, the options have the same meaning and default as the <strong>-inform</strong> option.</p> </dd> <dt><strong><a name="in_filename" class="item"><strong>-in filename</strong></a></strong></dt> <dd> <p>This specifies the input filename to read parameters from or standard input if this option is not specified.</p> </dd> <dt><strong><a name="out_filename" class="item"><strong>-out filename</strong></a></strong></dt> <dd> <p>This specifies the output filename parameters to. Standard output is used if this option is not present. The output filename should <strong>not</strong> be the same as the input filename.</p> </dd> <dt><strong><a name="noout" class="item"><strong>-noout</strong></a></strong></dt> <dd> <p>This option inhibits the output of the encoded version of the parameters.</p> </dd> <dt><strong><a name="text" class="item"><strong>-text</strong></a></strong></dt> <dd> <p>This option prints out the EC parameters in human readable form.</p> </dd> <dt><strong><a name="c" class="item"><strong>-C</strong></a></strong></dt> <dd> <p>This option converts the EC parameters into C code. The parameters can then be loaded by calling the <code>get_ec_group_XXX()</code> function.</p> </dd> <dt><strong><a name="check" class="item"><strong>-check</strong></a></strong></dt> <dd> <p>Validate the elliptic curve parameters.</p> </dd> <dt><strong><a name="name_arg" class="item"><strong>-name arg</strong></a></strong></dt> <dd> <p>Use the EC parameters with the specified 'short' name. Use <strong>-list_curves</strong> to get a list of all currently implemented EC parameters.</p> </dd> <dt><strong><a name="list_curves" class="item"><strong>-list_curves</strong></a></strong></dt> <dd> <p>If this options is specified <strong>ecparam</strong> will print out a list of all currently implemented EC parameters names and exit.</p> </dd> <dt><strong><a name="conv_form" class="item"><strong>-conv_form</strong></a></strong></dt> <dd> <p>This specifies how the points on the elliptic curve are converted into octet strings. Possible values are: <strong>compressed</strong>, <strong>uncompressed</strong> (the default value) and <strong>hybrid</strong>. For more information regarding the point conversion forms please read the X9.62 standard. <strong>Note</strong> Due to patent issues the <strong>compressed</strong> option is disabled by default for binary curves and can be enabled by defining the preprocessor macro <strong>OPENSSL_EC_BIN_PT_COMP</strong> at compile time.</p> </dd> <dt><strong><a name="param_enc_arg" class="item"><strong>-param_enc arg</strong></a></strong></dt> <dd> <p>This specifies how the elliptic curve parameters are encoded. Possible value are: <strong>named_curve</strong>, i.e. the ec parameters are specified by an OID, or <strong>explicit</strong> where the ec parameters are explicitly given (see <a href="http://www.ietf.org/rfc/rfc3279.txt" class="rfc">RFC 3279</a> for the definition of the EC parameters structures). The default value is <strong>named_curve</strong>. <strong>Note</strong> the <strong>implicitlyCA</strong> alternative, as specified in <a href="http://www.ietf.org/rfc/rfc3279.txt" class="rfc">RFC 3279</a>, is currently not implemented in OpenSSL.</p> </dd> <dt><strong><a name="no_seed" class="item"><strong>-no_seed</strong></a></strong></dt> <dd> <p>This option inhibits that the 'seed' for the parameter generation is included in the ECParameters structure (see <a href="http://www.ietf.org/rfc/rfc3279.txt" class="rfc">RFC 3279</a>).</p> </dd> <dt><strong><a name="genkey" class="item"><strong>-genkey</strong></a></strong></dt> <dd> <p>This option will generate an EC private key using the specified parameters.</p> </dd> <dt><strong><a name="rand_file" class="item"><strong>-rand file...</strong></a></strong></dt> <dd> <p>A file or files containing random data used to seed the random number generator. Multiple files can be specified separated by an OS-dependent character. The separator is <strong>;</strong> for MS-Windows, <strong>,</strong> for OpenVMS, and <strong>:</strong> for all others.</p> </dd> <dt><strong><a name="writerand_file" class="item">[<strong>-writerand file</strong>]</a></strong></dt> <dd> <p>Writes random data to the specified <em>file</em> upon exit. This can be used with a subsequent <strong>-rand</strong> flag.</p> </dd> <dt><strong><a name="engine_id" class="item"><strong>-engine id</strong></a></strong></dt> <dd> <p>Specifying an engine (by its unique <strong>id</strong> string) will cause <strong>ecparam</strong> 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.</p> </dd> </dl> <p> </p> <hr /> <h1><a name="notes">NOTES</a></h1> <p>PEM format EC parameters use the header and footer lines:</p> <pre> -----BEGIN EC PARAMETERS----- -----END EC PARAMETERS-----</pre> <p>OpenSSL is currently not able to generate new groups and therefore <strong>ecparam</strong> can only create EC parameters from known (named) curves.</p> <p> </p> <hr /> <h1><a name="examples">EXAMPLES</a></h1> <p>To create EC parameters with the group 'prime192v1':</p> <pre> openssl ecparam -out ec_param.pem -name prime192v1</pre> <p>To create EC parameters with explicit parameters:</p> <pre> openssl ecparam -out ec_param.pem -name prime192v1 -param_enc explicit</pre> <p>To validate given EC parameters:</p> <pre> openssl ecparam -in ec_param.pem -check</pre> <p>To create EC parameters and a private key:</p> <pre> openssl ecparam -out ec_key.pem -name prime192v1 -genkey</pre> <p>To change the point encoding to 'compressed':</p> <pre> openssl ecparam -in ec_in.pem -out ec_out.pem -conv_form compressed</pre> <p>To print out the EC parameters to standard output:</p> <pre> openssl ecparam -in ec_param.pem -noout -text</pre> <p> </p> <hr /> <h1><a name="see_also">SEE ALSO</a></h1> <p><em>ec(1)</em>, <em>dsaparam(1)</em></p> <p> </p> <hr /> <h1><a name="copyright">COPYRIGHT</a></h1> <p>Copyright 2003-2018 The OpenSSL Project Authors. All Rights Reserved.</p> <p>Licensed under the OpenSSL license (the "License"). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p> </body> </html>