openssl-spkac - SPKAC printing and generating command

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       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
       <https://www.openssl.org/source/license.html>.

3.4.1                                              2025-04-03                                OPENSSL-SPKAC(1SSL)

       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.

       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=

       The -engine option was deprecated in OpenSSL 3.0.

       The -digest option was added in OpenSSL 3.0.

       openssl-spkac - SPKAC printing and generating command

       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".

-help
           Print out a usage message.

       -infilename
           This  specifies  the  input  filename to read from or standard input if this option is not specified.
           Ignored if the -key option is used.

       -outfilename
           Specifies the output filename to write to or standard output by default.

       -digestdigest
           Use the specified digest to sign a created SPKAC file.  The default digest algorithm is MD5.

       -keyfilename|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.

       -keyformDER|PEM|P12|ENGINE
           The key format; unspecified by default.  See openssl-format-options(1) for details.

       -passinarg
           The   input   file   password   source.   For   more   information   about  the  format  of  arg  see
           openssl-passphrase-options(1).

       -challengestring
           Specifies the challenge string if an SPKAC is being created.

       -spkacspkacname
           Allows an alternative name form the variable containing the  SPKAC.  The  default  is  "SPKAC".  This
           option affects both generated and input SPKAC files.

       -spksectsection
           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.

       -engineid
           See "Engine Options" in openssl(1).  This option is deprecated.

       -providername-provider-pathpath-propquerypropq
           See "Provider Options" in openssl(1), provider(7), and property(7).

openssl(1), openssl-ca(1)

opensslspkac [-help] [-infilename] [-outfilename] [-digestdigest] [-keyfilename|uri] [-keyformDER|PEM|P12|ENGINE] [-passinarg] [-challengestring] [-pubkey] [-spkacspkacname] [-spksectsection]
       [-noout] [-verify] [-engineid] [-providername] [-provider-pathpath] [-propquerypropq]