public or private key processing tool
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]
The pkey command processes public or private keys. They can be converted between various forms and their components printed out.
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 Pass Phrase Options 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 Pass Phrase Options in openssl (1).
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.
These options encrypt the private key with the supplied cipher. Any algorithm name accepted by EVP_get_cipherbyname() is acceptable such as des3.
Prints out the various public or private key components in plain text in addition to the encoded version.
Print out only public key components even if a private key is being processed.
Do not output the encoded version of the key.
By default a private key is read from the input file: with this option a public key is read instead.
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.
This option checks the consistency of a key pair for both public and private components.
This option checks the correctness of either a public key or the public component of a key pair.
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
Copyright 2006-2021 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>.
genpkey (1), rsa (1), pkcs8 (1), dsa (1), genrsa (1), gendsa (1)