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=pod
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=begin comment
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{- join("\n", @autowarntext) -}
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=end comment
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=head1 NAME
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openssl-pkey - public or private key processing tool
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=head1 SYNOPSIS
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B<openssl> B<pkey>
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[B<-help>]
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[B<-inform> B<DER>|B<PEM>]
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[B<-outform> B<DER>|B<PEM>]
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[B<-in> I<filename>]
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[B<-passin> I<arg>]
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[B<-out> I<filename>]
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[B<-passout> I<arg>]
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[B<-traditional>]
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[B<-I<cipher>>]
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[B<-text>]
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[B<-text_pub>]
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[B<-noout>]
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[B<-pubin>]
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[B<-pubout>]
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[B<-check>]
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[B<-pubcheck>]
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{- $OpenSSL::safe::opt_engine_synopsis -}
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=for openssl ifdef engine
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=head1 DESCRIPTION
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This command processes public or private keys. They can be
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converted between various forms and their components printed out.
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=head1 OPTIONS
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=over 4
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=item B<-help>
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Print out a usage message.
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=item B<-inform> B<DER>|B<PEM>, B<-outform> B<DER>|B<PEM>
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The input and formats; the default is B<PEM>.
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See L<openssl(1)/Format Options> for details.
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=item B<-in> I<filename>
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This specifies the input filename to read a key from or standard input if this
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option is not specified. If the key is encrypted a pass phrase will be
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prompted for.
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=item B<-passin> I<arg>, B<-passout> I<arg>
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The password source for the input and output file.
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For more information about the format of B<arg>
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see L<openssl(1)/Pass Phrase Options>.
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=item B<-out> I<filename>
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This specifies the output filename to write a key to or standard output if this
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option is not specified. If any encryption options are set then a pass phrase
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will be prompted for. The output filename should B<not> be the same as the input
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filename.
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=item B<-traditional>
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Normally a private key is written using standard format: this is PKCS#8 form
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with the appropriate encryption algorithm (if any). If the B<-traditional>
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option is specified then the older "traditional" format is used instead.
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=item B<-I<cipher>>
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These options encrypt the private key with the supplied cipher. Any algorithm
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name accepted by EVP_get_cipherbyname() is acceptable such as B<des3>.
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=item B<-text>
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Prints out the various public or private key components in
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plain text in addition to the encoded version.
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=item B<-text_pub>
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Print out only public key components even if a private key is being processed.
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=item B<-noout>
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Do not output the encoded version of the key.
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=item B<-pubin>
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By default a private key is read from the input file: with this
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option a public key is read instead.
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=item B<-pubout>
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By default a private key is output: with this option a public
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key will be output instead. This option is automatically set if
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the input is a public key.
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=item B<-check>
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This option checks the consistency of a key pair for both public and private
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components.
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=item B<-pubcheck>
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This option checks the correctness of either a public key or the public component
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of a key pair.
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{- $OpenSSL::safe::opt_engine_item -}
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=back
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=head1 EXAMPLES
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To remove the pass phrase on an RSA private key:
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openssl pkey -in key.pem -out keyout.pem
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To encrypt a private key using triple DES:
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openssl pkey -in key.pem -des3 -out keyout.pem
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To convert a private key from PEM to DER format:
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openssl pkey -in key.pem -outform DER -out keyout.der
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To print out the components of a private key to standard output:
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openssl pkey -in key.pem -text -noout
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To print out the public components of a private key to standard output:
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openssl pkey -in key.pem -text_pub -noout
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To just output the public part of a private key:
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openssl pkey -in key.pem -pubout -out pubkey.pem
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=head1 SEE ALSO
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L<openssl(1)>,
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L<openssl-genpkey(1)>,
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L<openssl-rsa(1)>,
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L<openssl-pkcs8(1)>,
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L<openssl-dsa(1)>,
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L<openssl-genrsa(1)>,
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L<openssl-gendsa(1)>
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=head1 COPYRIGHT
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Copyright 2006-2019 The OpenSSL Project Authors. All Rights Reserved.
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Licensed under the Apache License 2.0 (the "License"). You may not use
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this file except in compliance with the License. You can obtain a copy
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in the file LICENSE in the source distribution or at
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L<https://www.openssl.org/source/license.html>.
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=cut
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