254 lines
9.4 KiB
HTML
254 lines
9.4 KiB
HTML
<?xml version="1.0" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>ec</title>
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<meta http-equiv="content-type" content="text/html; charset=utf-8" />
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<link rev="made" href="mailto:root@localhost" />
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</head>
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<body style="background-color: white">
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<!-- INDEX BEGIN -->
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<div name="index">
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<p><a name="__index__"></a></p>
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<ul>
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<li><a href="#name">NAME</a></li>
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<li><a href="#synopsis">SYNOPSIS</a></li>
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<li><a href="#description">DESCRIPTION</a></li>
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<li><a href="#options">OPTIONS</a></li>
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<li><a href="#notes">NOTES</a></li>
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<li><a href="#examples">EXAMPLES</a></li>
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<li><a href="#see_also">SEE ALSO</a></li>
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<li><a href="#copyright">COPYRIGHT</a></li>
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</ul>
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<hr name="index" />
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</div>
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<!-- INDEX END -->
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<p>
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</p>
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<hr />
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<h1><a name="name">NAME</a></h1>
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<p>openssl-ec,
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ec - EC key processing</p>
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<p>
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</p>
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<hr />
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<h1><a name="synopsis">SYNOPSIS</a></h1>
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<p><strong>openssl</strong> <strong>ec</strong>
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[<strong>-help</strong>]
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[<strong>-inform PEM|DER</strong>]
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[<strong>-outform PEM|DER</strong>]
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[<strong>-in filename</strong>]
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[<strong>-passin arg</strong>]
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[<strong>-out filename</strong>]
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[<strong>-passout arg</strong>]
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[<strong>-des</strong>]
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[<strong>-des3</strong>]
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[<strong>-idea</strong>]
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[<strong>-text</strong>]
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[<strong>-noout</strong>]
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[<strong>-param_out</strong>]
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[<strong>-pubin</strong>]
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[<strong>-pubout</strong>]
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[<strong>-conv_form arg</strong>]
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[<strong>-param_enc arg</strong>]
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[<strong>-no_public</strong>]
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[<strong>-check</strong>]
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[<strong>-engine id</strong>]</p>
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<p>
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</p>
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<hr />
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<h1><a name="description">DESCRIPTION</a></h1>
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<p>The <strong>ec</strong> command processes EC keys. They can be converted between various
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forms and their components printed out. <strong>Note</strong> OpenSSL uses the
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private key format specified in 'SEC 1: Elliptic Curve Cryptography'
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(http://www.secg.org/). To convert an OpenSSL EC private key into the
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PKCS#8 private key format use the <strong>pkcs8</strong> command.</p>
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<p>
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</p>
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<hr />
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<h1><a name="options">OPTIONS</a></h1>
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<dl>
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<dt><strong><a name="help" class="item"><strong>-help</strong></a></strong></dt>
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<dd>
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<p>Print out a usage message.</p>
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</dd>
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<dt><strong><a name="inform_der_pem" class="item"><strong>-inform DER|PEM</strong></a></strong></dt>
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<dd>
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<p>This specifies the input format. The <strong>DER</strong> option with a private key uses
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an ASN.1 DER encoded SEC1 private key. When used with a public key it
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uses the SubjectPublicKeyInfo structure as specified in <a href="http://www.ietf.org/rfc/rfc3280.txt" class="rfc">RFC 3280</a>.
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The <strong>PEM</strong> form is the default format: it consists of the <strong>DER</strong> format base64
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encoded with additional header and footer lines. In the case of a private key
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PKCS#8 format is also accepted.</p>
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</dd>
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<dt><strong><a name="outform_der_pem" class="item"><strong>-outform DER|PEM</strong></a></strong></dt>
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<dd>
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<p>This specifies the output format, the options have the same meaning and default
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as the <strong>-inform</strong> option.</p>
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</dd>
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<dt><strong><a name="in_filename" class="item"><strong>-in filename</strong></a></strong></dt>
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<dd>
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<p>This specifies the input filename to read a key from or standard input if this
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option is not specified. If the key is encrypted a pass phrase will be
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prompted for.</p>
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</dd>
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<dt><strong><a name="passin_arg" class="item"><strong>-passin arg</strong></a></strong></dt>
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<dd>
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<p>The input file password source. For more information about the format of <strong>arg</strong>
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see the <strong>PASS PHRASE ARGUMENTS</strong> section in <em>openssl(1)</em>.</p>
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</dd>
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<dt><strong><a name="out_filename" class="item"><strong>-out filename</strong></a></strong></dt>
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<dd>
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<p>This specifies the output filename to write a key to or standard output by
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is not specified. If any encryption options are set then a pass phrase will be
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prompted for. The output filename should <strong>not</strong> be the same as the input
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filename.</p>
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</dd>
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<dt><strong><a name="passout_arg" class="item"><strong>-passout arg</strong></a></strong></dt>
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<dd>
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<p>The output file password source. For more information about the format of <strong>arg</strong>
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see the <strong>PASS PHRASE ARGUMENTS</strong> section in <em>openssl(1)</em>.</p>
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</dd>
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<dt><strong><a name="des_des3_idea" class="item"><strong>-des|-des3|-idea</strong></a></strong></dt>
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<dd>
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<p>These options encrypt the private key with the DES, triple DES, IDEA or
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any other cipher supported by OpenSSL before outputting it. A pass phrase is
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prompted for.
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If none of these options is specified the key is written in plain text. This
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means that using the <strong>ec</strong> utility to read in an encrypted key with no
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encryption option can be used to remove the pass phrase from a key, or by
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setting the encryption options it can be use to add or change the pass phrase.
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These options can only be used with PEM format output files.</p>
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</dd>
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<dt><strong><a name="text" class="item"><strong>-text</strong></a></strong></dt>
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<dd>
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<p>Prints out the public, private key components and parameters.</p>
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</dd>
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<dt><strong><a name="noout" class="item"><strong>-noout</strong></a></strong></dt>
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<dd>
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<p>This option prevents output of the encoded version of the key.</p>
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</dd>
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<dt><strong><a name="pubin" class="item"><strong>-pubin</strong></a></strong></dt>
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<dd>
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<p>By default, a private key is read from the input file. With this option a
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public key is read instead.</p>
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</dd>
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<dt><strong><a name="pubout" class="item"><strong>-pubout</strong></a></strong></dt>
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<dd>
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<p>By default a private key is output. With this option a public
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key will be output instead. This option is automatically set if the input is
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a public key.</p>
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</dd>
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<dt><strong><a name="conv_form" class="item"><strong>-conv_form</strong></a></strong></dt>
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<dd>
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<p>This specifies how the points on the elliptic curve are converted
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into octet strings. Possible values are: <strong>compressed</strong> (the default
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value), <strong>uncompressed</strong> and <strong>hybrid</strong>. For more information regarding
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the point conversion forms please read the X9.62 standard.
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<strong>Note</strong> Due to patent issues the <strong>compressed</strong> 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 <strong>OPENSSL_EC_BIN_PT_COMP</strong> at compile time.</p>
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</dd>
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<dt><strong><a name="param_enc_arg" class="item"><strong>-param_enc arg</strong></a></strong></dt>
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<dd>
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<p>This specifies how the elliptic curve parameters are encoded.
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Possible value are: <strong>named_curve</strong>, i.e. the ec parameters are
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specified by an OID, or <strong>explicit</strong> where the ec parameters are
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explicitly given (see <a href="http://www.ietf.org/rfc/rfc3279.txt" class="rfc">RFC 3279</a> for the definition of the
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EC parameters structures). The default value is <strong>named_curve</strong>.
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<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>,
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is currently not implemented in OpenSSL.</p>
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</dd>
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<dt><strong><a name="no_public" class="item"><strong>-no_public</strong></a></strong></dt>
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<dd>
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<p>This option omits the public key components from the private key output.</p>
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</dd>
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<dt><strong><a name="check" class="item"><strong>-check</strong></a></strong></dt>
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<dd>
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<p>This option checks the consistency of an EC private or public key.</p>
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</dd>
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<dt><strong><a name="engine_id" class="item"><strong>-engine id</strong></a></strong></dt>
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<dd>
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<p>Specifying an engine (by its unique <strong>id</strong> string) will cause <strong>ec</strong>
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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.</p>
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</dd>
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</dl>
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<p>
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</p>
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<hr />
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<h1><a name="notes">NOTES</a></h1>
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<p>The PEM private key format uses the header and footer lines:</p>
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<pre>
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-----BEGIN EC PRIVATE KEY-----
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-----END EC PRIVATE KEY-----</pre>
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<p>The PEM public key format uses the header and footer lines:</p>
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<pre>
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-----BEGIN PUBLIC KEY-----
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-----END PUBLIC KEY-----</pre>
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<p>
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</p>
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<hr />
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<h1><a name="examples">EXAMPLES</a></h1>
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<p>To encrypt a private key using triple DES:</p>
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<pre>
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openssl ec -in key.pem -des3 -out keyout.pem</pre>
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<p>To convert a private key from PEM to DER format:</p>
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<pre>
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openssl ec -in key.pem -outform DER -out keyout.der</pre>
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<p>To print out the components of a private key to standard output:</p>
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<pre>
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openssl ec -in key.pem -text -noout</pre>
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<p>To just output the public part of a private key:</p>
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<pre>
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openssl ec -in key.pem -pubout -out pubkey.pem</pre>
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<p>To change the parameters encoding to <strong>explicit</strong>:</p>
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<pre>
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openssl ec -in key.pem -param_enc explicit -out keyout.pem</pre>
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<p>To change the point conversion form to <strong>compressed</strong>:</p>
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<pre>
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openssl ec -in key.pem -conv_form compressed -out keyout.pem</pre>
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<p>
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</p>
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<hr />
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<h1><a name="see_also">SEE ALSO</a></h1>
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<p><em>ecparam(1)</em>, <em>dsa(1)</em>, <em>rsa(1)</em></p>
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<p>
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</p>
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<hr />
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<h1><a name="copyright">COPYRIGHT</a></h1>
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<p>Copyright 2003-2019 The OpenSSL Project Authors. All Rights Reserved.</p>
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<p>Licensed under the OpenSSL license (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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<a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>
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</body>
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</html>
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