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Title "PKEY 1" For nroff, turn off justification. Always turn off hyphenation; it makes
way too many mistakes in technical documents.
openssl-pkey, pkey - public or private key processing tool Header "SYNOPSIS" \fBopenssl pkey [-help] [-inform PEM|DER] [-outform PEM|DER] [-in filename] [-passin arg] [-out filename] [-passout arg] [-traditional] [-\f(BIcipher] [-text] [-text_pub] [-noout] [-pubin] [-pubout] [-engine id] [-check] [-pubcheck] Header "DESCRIPTION" The pkey command processes public or private keys. They can be converted between various forms and their components printed out. Header "OPTIONS" Item "-help" Print out a usage message. Item "-inform DER|PEM" This specifies the input format \s-1DER\s0 or \s-1PEM.\s0 The default format is \s-1PEM.\s0 Item "-outform DER|PEM" This specifies the output format, the options have the same meaning and default as the -inform option. Item "-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. Item "-passin arg" The input file password source. For more information about the format of arg see \*(L"Pass Phrase Options\*(R" in openssl\|(1). Item "-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. Item "-passout password" The output file password source. For more information about the format of arg see \*(L"Pass Phrase Options\*(R" in openssl\|(1). Item "-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 \*(L"traditional\*(R" format is used instead. Item "-cipher" These options encrypt the private key with the supplied cipher. Any algorithm name accepted by EVP_get_cipherbyname() is acceptable such as des3. Item "-text" Prints out the various public or private key components in plain text in addition to the encoded version. Item "-text_pub" Print out only public key components even if a private key is being processed. Item "-noout" Do not output the encoded version of the key. Item "-pubin" By default a private key is read from the input file: with this option a public key is read instead. Item "-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. Item "-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. Item "-check" This option checks the consistency of a key pair for both public and private components. Item "-pubcheck" This option checks the correctness of either a public key or the public component of a key pair. Header "EXAMPLES" To remove the pass phrase on an \s-1RSA\s0 private key:

.Vb 1 openssl pkey -in key.pem -out keyout.pem .Ve

To encrypt a private key using triple \s-1DES:\s0

.Vb 1 openssl pkey -in key.pem -des3 -out keyout.pem .Ve

To convert a private key from \s-1PEM\s0 to \s-1DER\s0 format:

.Vb 1 openssl pkey -in key.pem -outform DER -out keyout.der .Ve

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

.Vb 1 openssl pkey -in key.pem -text -noout .Ve

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

.Vb 1 openssl pkey -in key.pem -text_pub -noout .Ve

To just output the public part of a private key:

.Vb 1 openssl pkey -in key.pem -pubout -out pubkey.pem .Ve

Header "SEE ALSO" \fBgenpkey\|(1), rsa\|(1), pkcs8\|(1), \fBdsa\|(1), genrsa\|(1), gendsa\|(1) Header "COPYRIGHT" Copyright 2006-2021 The OpenSSL Project Authors. All Rights Reserved.

Licensed under the OpenSSL license (the \*(L"License\*(R"). 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 <https://www.openssl.org/source/license.html>.