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hanyw@hanyw:~$ man openssl-spkac |grep -Ev "^#34;
OPENSSL-SPKAC(1SSL)                                                              OpenSSL                                                             OPENSSL-SPKAC(1SSL)
NAME
       openssl-spkac - SPKAC printing and generating command
SYNOPSIS
       openssl spkac [-help] [-in filename] [-out filename] [-digest digest] [-key filename|uri] [-keyform DER|PEM|P12|ENGINE] [-passin arg] [-challenge string]
       [-pubkey] [-spkac spkacname] [-spksect section] [-noout] [-verify] [-engine id] [-provider name] [-provider-path path] [-propquery propq]
DESCRIPTION
       This command processes Netscape signed public key and challenge (SPKAC) files. It can print out their contents, verify the signature and produce its own SPKACs
       from a supplied private key.
OPTIONS
       -help
           Print out a usage message.
       -in filename
           This specifies the input filename to read from or standard input if this option is not specified. Ignored if the -key option is used.
       -out filename
           Specifies the output filename to write to or standard output by default.
       -digest digest
           Use the specified digest to sign a created SPKAC file.  The default digest algorithm is MD5.
       -key filename|uri
           Create an SPKAC file using the private key specified by filename or uri.  The -in, -noout, -spksect and -verify options are ignored if present.
       -keyform DER|PEM|P12|ENGINE
           The key format; unspecified by default.  See openssl-format-options(1) for details.
       -passin arg
           The input file password source. For more information about the format of arg see openssl-passphrase-options(1).
       -challenge string
           Specifies the challenge string if an SPKAC is being created.
       -spkac spkacname
           Allows an alternative name form the variable containing the SPKAC. The default is "SPKAC". This option affects both generated and input SPKAC files.
       -spksect section
           Allows an alternative name form the section containing the SPKAC. The default is the default section.
       -noout
           Don't output the text version of the SPKAC (not used if an SPKAC is being created).
       -pubkey
           Output the public key of an SPKAC (not used if an SPKAC is being created).
       -verify
           Verifies the digital signature on the supplied SPKAC.
       -engine id
           See "Engine Options" in openssl(1).  This option is deprecated.
       -provider name
       -provider-path path
       -propquery propq
           See "Provider Options" in openssl(1), provider(7), and property(7).
EXAMPLES
       Print out the contents of an SPKAC:
        openssl spkac -in spkac.cnf
       Verify the signature of an SPKAC:
        openssl spkac -in spkac.cnf -noout -verify
       Create an SPKAC using the challenge string "hello":
        openssl spkac -key key.pem -challenge hello -out spkac.cnf
       Example of an SPKAC, (long lines split up for clarity):
        SPKAC=MIG5MGUwXDANBgkqhkiG9w0BAQEFAANLADBIAkEA\
        1cCoq2Wa3Ixs47uI7FPVwHVIPDx5yso105Y6zpozam135a\
        8R0CpoRvkkigIyXfcCjiVi5oWk+6FfPaD03uPFoQIDAQAB\
        FgVoZWxsbzANBgkqhkiG9w0BAQQFAANBAFpQtY/FojdwkJ\
        h1bEIYuc2EeM2KHTWPEepWYeawvHD0gQ3DngSC75YCWnnD\
        dq+NQ3F+X4deMx9AaEglZtULwV4=
NOTES
       A created SPKAC with suitable DN components appended can be fed to openssl-ca(1).
       SPKACs are typically generated by Netscape when a form is submitted containing the KEYGEN tag as part of the certificate enrollment process.
       The challenge string permits a primitive form of proof of possession of private key. By checking the SPKAC signature and a random challenge string some guarantee
       is given that the user knows the private key corresponding to the public key being certified. This is important in some applications. Without this it is possible
       for a previous SPKAC to be used in a "replay attack".
SEE ALSO
       openssl(1), openssl-ca(1)
HISTORY
       The -engine option was deprecated in OpenSSL 3.0.
       The -digest option was added in OpenSSL 3.0.
COPYRIGHT
       Copyright 2000-2021 The OpenSSL Project Authors. All Rights Reserved.
       Licensed under the Apache License 2.0 (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 .
3.0.2                                                                          2022-07-04                                                            OPENSSL-SPKAC(1SSL)