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+.\" Automatically generated by Pod::Man version 1.15
+.\" Thu May  9 13:15:09 2002
+.\"
+.\" Standard preamble:
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+.\" ======================================================================
+.\"
+.IX Title "SPKAC 1"
+.TH SPKAC 1 "perl v5.6.1" "2000-04-13" "User Contributed Perl Documentation"
+.UC
+.SH "NAME"
+spkac \- \s-1SPKAC\s0 printing and generating utility
+.SH "SYNOPSIS"
+.IX Header "SYNOPSIS"
+\&\fBopenssl\fR \fBspkac\fR
+[\fB\-in filename\fR]
+[\fB\-out filename\fR]
+[\fB\-key keyfile\fR]
+[\fB\-passin arg\fR]
+[\fB\-challenge string\fR]
+[\fB\-pubkey\fR]
+[\fB\-spkac spkacname\fR]
+[\fB\-spksect section\fR]
+[\fB\-noout\fR]
+[\fB\-verify\fR]
+.SH "DESCRIPTION"
+.IX Header "DESCRIPTION"
+The \fBspkac\fR command processes Netscape signed public key and challenge
+(\s-1SPKAC\s0) files. It can print out their contents, verify the signature and
+produce its own SPKACs from a supplied private key.
+.SH "COMMAND OPTIONS"
+.IX Header "COMMAND OPTIONS"
+.Ip "\fB\-in filename\fR" 4
+.IX Item "-in filename"
+This specifies the input filename to read from or standard input if this
+option is not specified. Ignored if the \fB\-key\fR option is used.
+.Ip "\fB\-out filename\fR" 4
+.IX Item "-out filename"
+specifies the output filename to write to or standard output by
+default.
+.Ip "\fB\-key keyfile\fR" 4
+.IX Item "-key keyfile"
+create an \s-1SPKAC\s0 file using the private key in \fBkeyfile\fR. The
+\&\fB\-in\fR, \fB\-noout\fR, \fB\-spksect\fR and \fB\-verify\fR options are ignored if
+present.
+.Ip "\fB\-passin password\fR" 4
+.IX Item "-passin password"
+the input file password source. For more information about the format of \fBarg\fR
+see the \fB\s-1PASS\s0 \s-1PHRASE\s0 \s-1ARGUMENTS\s0\fR section in openssl(1).
+.Ip "\fB\-challenge string\fR" 4
+.IX Item "-challenge string"
+specifies the challenge string if an \s-1SPKAC\s0 is being created.
+.Ip "\fB\-spkac spkacname\fR" 4
+.IX Item "-spkac spkacname"
+allows an alternative name form the variable containing the
+\&\s-1SPKAC\s0. The default is \*(L"\s-1SPKAC\s0\*(R". This option affects both
+generated and input \s-1SPKAC\s0 files.
+.Ip "\fB\-spksect section\fR" 4
+.IX Item "-spksect section"
+allows an alternative name form the section containing the
+\&\s-1SPKAC\s0. The default is the default section.
+.Ip "\fB\-noout\fR" 4
+.IX Item "-noout"
+don't output the text version of the \s-1SPKAC\s0 (not used if an
+\&\s-1SPKAC\s0 is being created).
+.Ip "\fB\-pubkey\fR" 4
+.IX Item "-pubkey"
+output the public key of an \s-1SPKAC\s0 (not used if an \s-1SPKAC\s0 is
+being created).
+.Ip "\fB\-verify\fR" 4
+.IX Item "-verify"
+verifies the digital signature on the supplied \s-1SPKAC\s0.
+.SH "EXAMPLES"
+.IX Header "EXAMPLES"
+Print out the contents of an \s-1SPKAC:\s0
+.PP
+.Vb 1
+\& openssl spkac -in spkac.cnf
+.Ve
+Verify the signature of an \s-1SPKAC:\s0
+.PP
+.Vb 1
+\& openssl spkac -in spkac.cnf -noout -verify
+.Ve
+Create an \s-1SPKAC\s0 using the challenge string \*(L"hello\*(R":
+.PP
+.Vb 1
+\& openssl spkac -key key.pem -challenge hello -out spkac.cnf
+.Ve
+Example of an \s-1SPKAC\s0, (long lines split up for clarity):
+.PP
+.Vb 5
+\& SPKAC=MIG5MGUwXDANBgkqhkiG9w0BAQEFAANLADBIAkEA1cCoq2Wa3Ixs47uI7F\e
+\& PVwHVIPDx5yso105Y6zpozam135a8R0CpoRvkkigIyXfcCjiVi5oWk+6FfPaD03u\e
+\& PFoQIDAQABFgVoZWxsbzANBgkqhkiG9w0BAQQFAANBAFpQtY/FojdwkJh1bEIYuc\e
+\& 2EeM2KHTWPEepWYeawvHD0gQ3DngSC75YCWnnDdq+NQ3F+X4deMx9AaEglZtULwV\e
+\& 4=
+.Ve
+.SH "NOTES"
+.IX Header "NOTES"
+A created \s-1SPKAC\s0 with suitable \s-1DN\s0 components appended can be fed into
+the \fBca\fR utility.
+.PP
+SPKACs are typically generated by Netscape when a form is submitted
+containing the \fB\s-1KEYGEN\s0\fR tag as part of the certificate enrollment
+process.
+.PP
+The challenge string permits a primitive form of proof of possession
+of private key. By checking the \s-1SPKAC\s0 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 \s-1SPKAC\s0
+to be used in a \*(L"replay attack\*(R".
+.SH "SEE ALSO"
+.IX Header "SEE ALSO"
+ca(1)