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.\&quot; ========================================================================
.\&quot;
.IX Title &quot;PKEY 1&quot;
.TH PKEY 1 &quot;2023-09-11&quot; &quot;1.1.1w&quot; &quot;OpenSSL&quot;
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.SH &quot;NAME&quot;
openssl\-pkey, pkey \- public or private key processing tool
.SH &quot;SYNOPSIS&quot;
.IX Header &quot;SYNOPSIS&quot;
\&amp;\fBopenssl\fR \fBpkey\fR
[\fB\-help\fR]
[\fB\-inform PEM|DER\fR]
[\fB\-outform PEM|DER\fR]
[\fB\-in filename\fR]
[\fB\-passin arg\fR]
[\fB\-out filename\fR]
[\fB\-passout arg\fR]
[\fB\-traditional\fR]
[\fB\-\f(BIcipher\fB\fR]
[\fB\-text\fR]
[\fB\-text_pub\fR]
[\fB\-noout\fR]
[\fB\-pubin\fR]
[\fB\-pubout\fR]
[\fB\-engine id\fR]
[\fB\-check\fR]
[\fB\-pubcheck\fR]
.SH &quot;DESCRIPTION&quot;
.IX Header &quot;DESCRIPTION&quot;
The \fBpkey\fR command processes public or private keys. They can be converted
between various forms and their components printed out.
.SH &quot;OPTIONS&quot;
.IX Header &quot;OPTIONS&quot;
.IP &quot;\fB\-help\fR&quot; 4
.IX Item &quot;-help&quot;
Print out a usage message.
.IP &quot;\fB\-inform DER|PEM\fR&quot; 4
.IX Item &quot;-inform DER|PEM&quot;
This specifies the input format \s-1DER\s0 or \s-1PEM.\s0 The default format is \s-1PEM.\s0
.IP &quot;\fB\-outform DER|PEM\fR&quot; 4
.IX Item &quot;-outform DER|PEM&quot;
This specifies the output format, the options have the same meaning and default
as the \fB\-inform\fR option.
.IP &quot;\fB\-in filename\fR&quot; 4
.IX Item &quot;-in filename&quot;
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.
.IP &quot;\fB\-passin arg\fR&quot; 4
.IX Item &quot;-passin arg&quot;
The input file password source. For more information about the format of \fBarg\fR
see \*(L&quot;Pass Phrase Options\*(R&quot; in \fBopenssl\fR\|(1).
.IP &quot;\fB\-out filename\fR&quot; 4
.IX Item &quot;-out filename&quot;
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 \fBnot\fR be the same as the input
filename.
.IP &quot;\fB\-passout password\fR&quot; 4
.IX Item &quot;-passout password&quot;
The output file password source. For more information about the format of \fBarg\fR
see \*(L&quot;Pass Phrase Options\*(R&quot; in \fBopenssl\fR\|(1).
.IP &quot;\fB\-traditional\fR&quot; 4
.IX Item &quot;-traditional&quot;
Normally a private key is written using standard format: this is PKCS#8 form
with the appropriate encryption algorithm (if any). If the \fB\-traditional\fR
option is specified then the older \*(L&quot;traditional\*(R&quot; format is used instead.
.IP &quot;\fB\-\f(BIcipher\fB\fR&quot; 4
.IX Item &quot;-cipher&quot;
These options encrypt the private key with the supplied cipher. Any algorithm
name accepted by \fBEVP_get_cipherbyname()\fR is acceptable such as \fBdes3\fR.
.IP &quot;\fB\-text\fR&quot; 4
.IX Item &quot;-text&quot;
Prints out the various public or private key components in
plain text in addition to the encoded version.
.IP &quot;\fB\-text_pub\fR&quot; 4
.IX Item &quot;-text_pub&quot;
Print out only public key components even if a private key is being processed.
.IP &quot;\fB\-noout\fR&quot; 4
.IX Item &quot;-noout&quot;
Do not output the encoded version of the key.
.IP &quot;\fB\-pubin\fR&quot; 4
.IX Item &quot;-pubin&quot;
By default a private key is read from the input file: with this
option a public key is read instead.
.IP &quot;\fB\-pubout\fR&quot; 4
.IX Item &quot;-pubout&quot;
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.
.IP &quot;\fB\-engine id\fR&quot; 4
.IX Item &quot;-engine id&quot;
Specifying an engine (by its unique \fBid\fR string) will cause \fBpkey\fR
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.
.IP &quot;\fB\-check\fR&quot; 4
.IX Item &quot;-check&quot;
This option checks the consistency of a key pair for both public and private
components.
.IP &quot;\fB\-pubcheck\fR&quot; 4
.IX Item &quot;-pubcheck&quot;
This option checks the correctness of either a public key or the public component
of a key pair.
.SH &quot;EXAMPLES&quot;
.IX Header &quot;EXAMPLES&quot;
To remove the pass phrase on an \s-1RSA\s0 private key:
.PP
.Vb 1
\&amp; openssl pkey \-in key.pem \-out keyout.pem
.Ve
.PP
To encrypt a private key using triple \s-1DES:\s0
.PP
.Vb 1
\&amp; openssl pkey \-in key.pem \-des3 \-out keyout.pem
.Ve
.PP
To convert a private key from \s-1PEM\s0 to \s-1DER\s0 format:
.PP
.Vb 1
\&amp; openssl pkey \-in key.pem \-outform DER \-out keyout.der
.Ve
.PP
To print out the components of a private key to standard output:
.PP
.Vb 1
\&amp; openssl pkey \-in key.pem \-text \-noout
.Ve
.PP
To print out the public components of a private key to standard output:
.PP
.Vb 1
\&amp; openssl pkey \-in key.pem \-text_pub \-noout
.Ve
.PP
To just output the public part of a private key:
.PP
.Vb 1
\&amp; openssl pkey \-in key.pem \-pubout \-out pubkey.pem
.Ve
.SH &quot;SEE ALSO&quot;
.IX Header &quot;SEE ALSO&quot;
\&amp;\fBgenpkey\fR\|(1), \fBrsa\fR\|(1), \fBpkcs8\fR\|(1),
\&amp;\fBdsa\fR\|(1), \fBgenrsa\fR\|(1), \fBgendsa\fR\|(1)
.SH &quot;COPYRIGHT&quot;
.IX Header &quot;COPYRIGHT&quot;
Copyright 2006\-2021 The OpenSSL Project Authors. All Rights Reserved.
.PP
Licensed under the OpenSSL license (the \*(L&quot;License\*(R&quot;).  You may not use
this file except in compliance with the License.  You can obtain a copy
in the file \s-1LICENSE\s0 in the source distribution or at
&lt;https://www.openssl.org/source/license.html&gt;.
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