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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>rsa</title> <meta http-equiv="content-type" content="text/html; charset=utf-8" /> <link rev="made" href="mailto:root@localhost" /> </head> <body> <ul id="index"> <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="#BUGS">BUGS</a></li> <li><a href="#SEE-ALSO">SEE ALSO</a></li> <li><a href="#COPYRIGHT">COPYRIGHT</a></li> </ul> <h1 id="NAME">NAME</h1> <p>openssl-rsa, rsa - RSA key processing tool</p> <h1 id="SYNOPSIS">SYNOPSIS</h1> <p><b>openssl</b> <b>rsa</b> [<b>-help</b>] [<b>-inform PEM|DER</b>] [<b>-outform PEM|DER</b>] [<b>-in filename</b>] [<b>-passin arg</b>] [<b>-out filename</b>] [<b>-passout arg</b>] [<b>-aes128</b>] [<b>-aes192</b>] [<b>-aes256</b>] [<b>-aria128</b>] [<b>-aria192</b>] [<b>-aria256</b>] [<b>-camellia128</b>] [<b>-camellia192</b>] [<b>-camellia256</b>] [<b>-des</b>] [<b>-des3</b>] [<b>-idea</b>] [<b>-text</b>] [<b>-noout</b>] [<b>-modulus</b>] [<b>-check</b>] [<b>-pubin</b>] [<b>-pubout</b>] [<b>-RSAPublicKey_in</b>] [<b>-RSAPublicKey_out</b>] [<b>-engine id</b>]</p> <h1 id="DESCRIPTION">DESCRIPTION</h1> <p>The <b>rsa</b> command processes RSA keys. They can be converted between various forms and their components printed out. <b>Note</b> this command uses the traditional SSLeay compatible format for private key encryption: newer applications should use the more secure PKCS#8 format using the <b>pkcs8</b> utility.</p> <h1 id="OPTIONS">OPTIONS</h1> <dl> <dt id="help"><b>-help</b></dt> <dd> <p>Print out a usage message.</p> </dd> <dt id="inform-DER-PEM"><b>-inform DER|PEM</b></dt> <dd> <p>This specifies the input format. The <b>DER</b> option uses an ASN1 DER encoded form compatible with the PKCS#1 RSAPrivateKey or SubjectPublicKeyInfo format. The <b>PEM</b> form is the default format: it consists of the <b>DER</b> format base64 encoded with additional header and footer lines. On input PKCS#8 format private keys are also accepted.</p> </dd> <dt id="outform-DER-PEM"><b>-outform DER|PEM</b></dt> <dd> <p>This specifies the output format, the options have the same meaning and default as the <b>-inform</b> option.</p> </dd> <dt id="in-filename"><b>-in filename</b></dt> <dd> <p>This specifies the input filename to read a key from or standard input if this option is not specified. If the key is encrypted a pass phrase will be prompted for.</p> </dd> <dt id="passin-arg"><b>-passin arg</b></dt> <dd> <p>The input file password source. For more information about the format of <b>arg</b> see <a href="../man1/openssl.html">"Pass Phrase Options" in openssl(1)</a>.</p> </dd> <dt id="out-filename"><b>-out filename</b></dt> <dd> <p>This specifies the output filename to write a key to or standard output if this option is not specified. If any encryption options are set then a pass phrase will be prompted for. The output filename should <b>not</b> be the same as the input filename.</p> </dd> <dt id="passout-password"><b>-passout password</b></dt> <dd> <p>The output file password source. For more information about the format of <b>arg</b> see <a href="../man1/openssl.html">"Pass Phrase Options" in openssl(1)</a>.</p> </dd> <dt id="aes128--aes192--aes256--aria128--aria192--aria256--camellia128--camellia192--camellia256--des--des3--idea"><b>-aes128</b>, <b>-aes192</b>, <b>-aes256</b>, <b>-aria128</b>, <b>-aria192</b>, <b>-aria256</b>, <b>-camellia128</b>, <b>-camellia192</b>, <b>-camellia256</b>, <b>-des</b>, <b>-des3</b>, <b>-idea</b></dt> <dd> <p>These options encrypt the private key with the specified cipher before outputting it. A pass phrase is prompted for. If none of these options is specified the key is written in plain text. This means that using the <b>rsa</b> utility to read in an encrypted key with no encryption option can be used to remove the pass phrase from a key, or by setting the encryption options it can be use to add or change the pass phrase. These options can only be used with PEM format output files.</p> </dd> <dt id="text"><b>-text</b></dt> <dd> <p>Prints out the various public or private key components in plain text in addition to the encoded version.</p> </dd> <dt id="noout"><b>-noout</b></dt> <dd> <p>This option prevents output of the encoded version of the key.</p> </dd> <dt id="modulus"><b>-modulus</b></dt> <dd> <p>This option prints out the value of the modulus of the key.</p> </dd> <dt id="check"><b>-check</b></dt> <dd> <p>This option checks the consistency of an RSA private key.</p> </dd> <dt id="pubin"><b>-pubin</b></dt> <dd> <p>By default a private key is read from the input file: with this option a public key is read instead.</p> </dd> <dt id="pubout"><b>-pubout</b></dt> <dd> <p>By default a private key is output: with this option a public key will be output instead. This option is automatically set if the input is a public key.</p> </dd> <dt id="RSAPublicKey_in--RSAPublicKey_out"><b>-RSAPublicKey_in</b>, <b>-RSAPublicKey_out</b></dt> <dd> <p>Like <b>-pubin</b> and <b>-pubout</b> except <b>RSAPublicKey</b> format is used instead.</p> </dd> <dt id="engine-id"><b>-engine id</b></dt> <dd> <p>Specifying an engine (by its unique <b>id</b> string) will cause <b>rsa</b> 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> <h1 id="NOTES">NOTES</h1> <p>The PEM private key format uses the header and footer lines:</p> <pre><code> -----BEGIN RSA PRIVATE KEY----- -----END RSA PRIVATE KEY-----</code></pre> <p>The PEM public key format uses the header and footer lines:</p> <pre><code> -----BEGIN PUBLIC KEY----- -----END PUBLIC KEY-----</code></pre> <p>The PEM <b>RSAPublicKey</b> format uses the header and footer lines:</p> <pre><code> -----BEGIN RSA PUBLIC KEY----- -----END RSA PUBLIC KEY-----</code></pre> <h1 id="EXAMPLES">EXAMPLES</h1> <p>To remove the pass phrase on an RSA private key:</p> <pre><code> openssl rsa -in key.pem -out keyout.pem</code></pre> <p>To encrypt a private key using triple DES:</p> <pre><code> openssl rsa -in key.pem -des3 -out keyout.pem</code></pre> <p>To convert a private key from PEM to DER format:</p> <pre><code> openssl rsa -in key.pem -outform DER -out keyout.der</code></pre> <p>To print out the components of a private key to standard output:</p> <pre><code> openssl rsa -in key.pem -text -noout</code></pre> <p>To just output the public part of a private key:</p> <pre><code> openssl rsa -in key.pem -pubout -out pubkey.pem</code></pre> <p>Output the public part of a private key in <b>RSAPublicKey</b> format:</p> <pre><code> openssl rsa -in key.pem -RSAPublicKey_out -out pubkey.pem</code></pre> <h1 id="BUGS">BUGS</h1> <p>There should be an option that automatically handles .key files, without having to manually edit them.</p> <h1 id="SEE-ALSO">SEE ALSO</h1> <p><a href="../man1/pkcs8.html">pkcs8(1)</a>, <a href="../man1/dsa.html">dsa(1)</a>, <a href="../man1/genrsa.html">genrsa(1)</a>, <a href="../man1/gendsa.html">gendsa(1)</a></p> <h1 id="COPYRIGHT">COPYRIGHT</h1> <p>Copyright 2000-2021 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>
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