NAME

       openssl-pkey, pkey - public or private key processing tool

SYNOPSIS

       openssl pkey [-help] [-inform PEM|DER] [-outform PEM|DER] [-in filename] [-passin arg]
       [-out filename] [-passout arg] [-traditional] [-cipher] [-text] [-text_pub] [-noout]
       [-pubin] [-pubout] [-engine id] [-check] [-pubcheck]

DESCRIPTION

       The pkey command processes public or private keys. They can be converted between various
       forms and their components printed out.

OPTIONS

       -help
           Print out a usage message.

       -inform DER|PEM
           This specifies the input format DER or PEM. The default format is PEM.

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

       -in filename
           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.

       -passin arg
           The input file password source. For more information about the format of arg see the
           PASS PHRASE ARGUMENTS section in openssl(1).

       -out filename
           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 not be the same as the input filename.

       -passout password
           The output file password source. For more information about the format of arg see the
           PASS PHRASE ARGUMENTS section in openssl(1).

       -traditional
           Normally a private key is written using standard format: this is PKCS#8 form with the
           appropriate encryption algorithm (if any). If the -traditional option is specified
           then the older "traditional" format is used instead.

       -cipher
           These options encrypt the private key with the supplied cipher. Any algorithm name
           accepted by EVP_get_cipherbyname() is acceptable such as des3.

       -text
           Prints out the various public or private key components in plain text in addition to
           the encoded version.

       -text_pub
           Print out only public key components even if a private key is being processed.

       -noout
           Do not output the encoded version of the key.

       -pubin
           By default a private key is read from the input file: with this option a public key is
           read instead.

       -pubout
           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.

       -engine id
           Specifying an engine (by its unique id string) will cause pkey 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.

       -check
           This option checks the consistency of a key pair for both public and private
           components.

       -pubcheck
           This option checks the correctness of either a public key or the public component of a
           key pair.

EXAMPLES

       To remove the pass phrase on an RSA private key:

        openssl pkey -in key.pem -out keyout.pem

       To encrypt a private key using triple DES:

        openssl pkey -in key.pem -des3 -out keyout.pem

       To convert a private key from PEM to DER format:

        openssl pkey -in key.pem -outform DER -out keyout.der

       To print out the components of a private key to standard output:

        openssl pkey -in key.pem -text -noout

       To print out the public components of a private key to standard output:

        openssl pkey -in key.pem -text_pub -noout

       To just output the public part of a private key:

        openssl pkey -in key.pem -pubout -out pubkey.pem

SEE ALSO

       genpkey(1), rsa(1), pkcs8(1), dsa(1), genrsa(1), gendsa(1)

COPYRIGHT

       Copyright 2006-2017 The OpenSSL Project Authors. All Rights Reserved.

       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 <https://www.openssl.org/source/license.html>.