mirror of https://github.com/openssl/openssl.git
168 lines
4.1 KiB
Plaintext
168 lines
4.1 KiB
Plaintext
=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-spkac - SPKAC printing and generating command
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=head1 SYNOPSIS
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B<openssl> B<spkac>
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[B<-help>]
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[B<-in> I<filename>]
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[B<-out> I<filename>]
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[B<-key> I<filename>|I<uri>]
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[B<-keyform> B<DER>|B<PEM>|B<P12>|B<ENGINE>]
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[B<-passin> I<arg>]
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[B<-challenge> I<string>]
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[B<-pubkey>]
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[B<-spkac> I<spkacname>]
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[B<-spksect> I<section>]
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[B<-noout>]
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[B<-verify>]
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{- $OpenSSL::safe::opt_engine_synopsis -}{- $OpenSSL::safe::opt_provider_synopsis -}
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=for openssl ifdef engine
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=head1 DESCRIPTION
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This command processes Netscape signed public key and challenge
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(SPKAC) files. It can print out their contents, verify the signature and
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produce its own SPKACs from a supplied private key.
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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<-in> I<filename>
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This specifies the input filename to read from or standard input if this
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option is not specified. Ignored if the B<-key> option is used.
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=item B<-out> I<filename>
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Specifies the output filename to write to or standard output by
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default.
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=item B<-key> I<filename>|I<uri>
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Create an SPKAC file using the private key specified by I<filename> or I<uri>.
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The B<-in>, B<-noout>, B<-spksect> and B<-verify> options are ignored if
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present.
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=item B<-keyform> B<DER>|B<PEM>|B<P12>|B<ENGINE>
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The key format; the default is B<PEM>.
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The only value with effect is B<ENGINE>; all others have become obsolete.
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See L<openssl-format-options(1)> for details.
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=item B<-passin> I<arg>
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The input file password source. For more information about the format of I<arg>
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see L<openssl-passphrase-options(1)>.
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=item B<-challenge> I<string>
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Specifies the challenge string if an SPKAC is being created.
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=item B<-spkac> I<spkacname>
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Allows an alternative name form the variable containing the
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SPKAC. The default is "SPKAC". This option affects both
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generated and input SPKAC files.
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=item B<-spksect> I<section>
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Allows an alternative name form the section containing the
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SPKAC. The default is the default section.
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=item B<-noout>
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Don't output the text version of the SPKAC (not used if an
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SPKAC is being created).
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=item B<-pubkey>
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Output the public key of an SPKAC (not used if an SPKAC is
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being created).
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=item B<-verify>
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Verifies the digital signature on the supplied SPKAC.
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{- $OpenSSL::safe::opt_engine_item -}
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{- $OpenSSL::safe::opt_provider_item -}
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=back
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=head1 EXAMPLES
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Print out the contents of an SPKAC:
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openssl spkac -in spkac.cnf
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Verify the signature of an SPKAC:
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openssl spkac -in spkac.cnf -noout -verify
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Create an SPKAC using the challenge string "hello":
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openssl spkac -key key.pem -challenge hello -out spkac.cnf
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Example of an SPKAC, (long lines split up for clarity):
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SPKAC=MIG5MGUwXDANBgkqhkiG9w0BAQEFAANLADBIAkEA\
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1cCoq2Wa3Ixs47uI7FPVwHVIPDx5yso105Y6zpozam135a\
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8R0CpoRvkkigIyXfcCjiVi5oWk+6FfPaD03uPFoQIDAQAB\
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FgVoZWxsbzANBgkqhkiG9w0BAQQFAANBAFpQtY/FojdwkJ\
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h1bEIYuc2EeM2KHTWPEepWYeawvHD0gQ3DngSC75YCWnnD\
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dq+NQ3F+X4deMx9AaEglZtULwV4=
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=head1 NOTES
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A created SPKAC with suitable DN components appended can be fed to
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L<openssl-ca(1)>.
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SPKACs are typically generated by Netscape when a form is submitted
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containing the B<KEYGEN> tag as part of the certificate enrollment
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process.
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The challenge string permits a primitive form of proof of possession
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of private key. By checking the SPKAC signature and a random challenge
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string some guarantee is given that the user knows the private key
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corresponding to the public key being certified. This is important in
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some applications. Without this it is possible for a previous SPKAC
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to be used in a "replay attack".
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=head1 SEE ALSO
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L<openssl(1)>,
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L<openssl-ca(1)>
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=head1 HISTORY
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All B<-keyform> values except B<ENGINE> have become obsolete in OpenSSL 3.0.0
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and have no effect.
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The B<-engine> option was deprecated in OpenSSL 3.0.
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=head1 COPYRIGHT
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Copyright 2000-2020 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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